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{{short description|Latin phrase that translates literally to 'on site'}} | |||
{{distinguish|Insitu, Inc.}} | {{distinguish|Insitu, Inc.}} | ||
{{more citations needed|date=December 2016}} | |||
{{Multiple issues| | |||
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{{Use dmy dates|date=October 2019}} | ||
{{one source|date=February 2012}} | |||
{{original research|date=February 2012}} | |||
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{{italic title}} | {{italic title}} | ||
''' |
'''{{Lang|la|In situ}}'''{{efn|{{IPAc-en|UK|ɪ|n|_|ˈ|s|ɪ|tj|uː|audio=LL-Q1860 (eng)-Vealhurl-in situ.wav}}, {{IPAc-en|ɪ|n|_|ˈ|s|ɪ|tʃ|uː}}; {{IPAc-en|US|ˌ|ɪ|n|_|ˈ|s|aɪ|tj|uː}}, {{IPAc-en|ˌ|ɪ|n|_|ˈ|s|ɪ|tj|uː}};<ref>{{Cite web|url=https://www.oed.com/dictionary/in-situ_adv?tab=factsheet#1213246030|title=in situ, adv. & adj. 1648– |publisher=] |year=2024 |website=] |access-date=2024-10-07 }}</ref> often not italicized in English<ref>{{citation|year=2010|title=The Publication Manual of the American Psychological Association|edition=6th|location=Washington, DC, US|publisher=]|isbn=978-1-4338-0562-2|section=4.21 Use of Italics}}</ref>}} is a ] phrase meaning "in place" or "on site", derived from ''{{linktext|in|lang=la}}'' ("in") and ''{{linktext|situ|lang=la}}'' (] of ''situs'', "place").<ref></ref> The term refers to the examination or preservation of ] within their original place or context. This methodological approach, used across diverse disciplines, maintains contextual integrity essential for accurate analysis. Conversely, ''ex situ'' methods examine subjects outside their original context. | ||
The ]s frequently implement ''in situ'' methodologies. ] employ field analysis of soil composition and ]s, while ] relies on direct ] to obtain accurate environmental data. ] examines ]s in their natural ]s, revealing behavioral patterns and ecological interactions that laboratory settings cannot replicate. In ] and ], ''in situ'' techniques enable the observation of substances and reactions under native conditions, facilitating the documentation of dynamic processes. | |||
⚫ | ==Aerospace== | ||
In the ], equipment on-board aircraft must be tested ''in situ'', or in place, to confirm everything functions properly as a system. Individually, each piece may work but interference from nearby equipment may create unanticipated problems. Special test equipment is available for this ''in situ'' testing. | |||
''In situ'' applications extend to various ]s as well. ] implements on-site inspection protocols and monitoring systems for operational evaluation without system interruption. In medical terminology, particularly ], ''in situ'' designates ]s that remain confined to their point of origin. This diagnostic classification—indicating no invasion of adjacent tissues—serves as a determinant for treatment protocols and ] assessment. ] utilizes ''in situ'' planetary research methods, conducting direct observational studies and data collection on ], thereby avoiding the complexities inherent in ]s. | |||
The ], notably ], employ ''in situ'' methodologies to maintain contextual authenticity. Archaeological investigations preserve the spatial relationships and environmental conditions of ] at ] sites, enabling more precise historical analysis. In ] and practice, the ''in situ'' principle guides both creation and exhibition. ]s, such as environmental sculptures or architectural installations, demonstrate deliberate integration with their designated locations. This contextual placement establishes a methodological framework that emphasizes the relationship between artistic works and their environmental or cultural settings. | |||
⚫ | ==Aerospace industry== | ||
In aerospace ], ''in situ'' inspection denotes diagnostic methodologies that evaluate components within their operational environments—eliminating the need for disassembly or service interruption. The ] (NDT) techniques employed for ''in situ'' damage detection include: ], which measures ]s to identify structural anomalies; speckle shearing ] (also known as ]), which analyzes surface deformation patterns; and ], which uses ] propagation to detect internal defects in ]s.<ref name="Addepalli"/> Each technique exhibits characteristic operational constraints. Infrared thermography exhibits reduced effectiveness on low-] materials,<ref>{{cite web | url=https://www.flir.com/discover/professional-tools/how-does-emissivity-affect-thermal-imaging/?srsltid=AfmBOopyv0S_iwA3Cz9ssDWC8GJny8SnmJWj-ytZ4VzunW6git0eJ1aD | title=How Does Emissivity Affect Thermal Imaging? | date=1 November 2021 |access-date=2024-10-12 |publisher=] }}</ref> shearography requires carefully controlled environmental conditions,<ref>{{cite book | chapter-url=https://doi.org/10.1007/978-3-319-26553-7_3 | doi=10.1007/978-3-319-26553-7_3 | chapter=Shearography | title=Handbook of Advanced Nondestructive Evaluation | date=2019 | last1=Yang | first1=Lianxiang | last2=Li | first2=Junrui | pages=383–384 | isbn=978-3-319-26552-0 }}</ref> and ultrasonic testing protocols can be time-intensive for large structural components.<ref>{{cite book | chapter-url=https://doi.org/10.1016/B978-0-08-102706-6.00018-0 | doi=10.1016/B978-0-08-102706-6.00018-0 | chapter=Sensing solutions for assessing and monitoring underwater systems | title=Sensor Technologies for Civil Infrastructures | date=2022 | last1=Rizzo | first1=P. | pages=362–363 | isbn=978-0-08-102706-6 }}</ref> Nevertheless, the systematic integration of these complementary methodologies substantially enhances overall diagnostic capabilities.<ref name="Addepalli"/> | |||
An additional approach involves the use of ] (AC) and ] (DC) sensor arrays in real-time monitoring applications, facilitating ''in situ'' detection of structural degradation phenomena—including matrix discontinuities, interlaminar ]s, and fiber fracture mechanisms—through quantitative analysis of ] and ] variations within ] configurations.<ref name="Addepalli">{{cite journal |last1=Addepalli |first1=Sri |last2=Roy |first2=Rajkumar |last3=Axinte |first3=Dragoş |last4=Mehnen |first4=Jörn |title='In-situ' Inspection Technologies: Trends in Degradation Assessment and Associated Technologies |journal=Procedia CIRP |date=2017 |volume=59 |page=37 |doi=10.1016/j.procir.2016.10.003 }}</ref> | |||
==Archaeology== | ==Archaeology== | ||
] arrowhead ''in situ'' |
] arrowhead ''in situ'']] | ||
In ] methodology, the term ''in situ'' designates ] and other materials that maintain their original depositional context, undisturbed since their initial deposition. The systematic documentation of ], ], and associated matrices of ''in situ'' materials enables the reconstruction of historical processes and cultural practices. While artifacts frequently require extraction for analytical purposes, ]—including ]s, ]s, and ]—necessitate comprehensive ''in situ'' documentation to preserve contextual data during stratigraphic ].<ref name="Renfrew_Bahn">{{cite book |title=Archaeology: Theories, Methods and Practice |first1=Colin |last1=Renfrew |author-link1=Colin Renfrew |first2=Paul |last2=Bahn |date=2020 |author-link2=Paul Bahn |isbn=978-0-500-29424-6 |edition=8th |publisher=] |location=London }}</ref>{{rp|page=121}} Documentation protocols encompass multiple recording methodologies: detailed field notation, scaled ]s, ] representation, and high-resolution photographic documentation. Contemporary archaeological practice incorporates advanced digital technologies, including ], ], ], and ] (GIS), to capture complex spatial relationships.<ref>{{Cite journal|title=An Innovative System for Enhancing Archaeological In Situ Excavation through Geospatial Integration|first1=Asimina|last1=Dimara|first2=Sotirios|last2=Tsakiridis|first3=Doukas|last3=Psarros|first4=Alexios|last4=Papaioannou|first5=Dimitrios|last5=Varsamis|first6=Christos-Nikolaos|last6=Anagnostopoulos|first7=Stelios|last7=Krinidis|date=24 May 2024 |journal=Heritage|volume=7|issue=5|pages=2586–2619|doi=10.3390/heritage7050124 |doi-access=free }}</ref> Materials recovered from secondary contexts (''ex situ''), including those displaced through non-professional excavation activities, demonstrate diminished interpretive value; however, such assemblages may provide diagnostic indicators regarding the spatial distribution and typological characteristics of unexcavated ''in situ'' deposits, thereby informing subsequent excavation plans.<ref>{{Cite web|url=https://research.bangor.ac.uk/portal/en/researchoutputs/an-empirical-examination-of-archaeological-damage-caused-by-unprofessional-extraction-of-archaeology-ex-situ-looting(142639d2-0c95-4338-8775-4c5e3fb9843e).html |title=An empirical examination of archaeological damage caused by unprofessional extraction of archaeology ex situ ('looting'): A case study from Austria |first=Raimund|last=Karl|date=2 January 2019 |via=] |publisher=Archäologische Denkmalpflege |pages=1–2 |access-date=2024-10-24 }}</ref><ref>{{Cite journal|url=https://onlinelibrary.wiley.com/doi/10.1002/jqs.3270|title=Coastal curios? An analysis of ex situ beach finds for mapping new Palaeolithic sites at Happisburgh, UK|first1=Rachel|last1=Bynoe|first2=Nick M.|last2=Ashton|first3=Tim|last3=Grimmer|first4=Peter|last4=Hoare|first5=Joanne|last5=Leonard|first6=Simon G.|last6=Lewis|first7=Darren|last7=Nicholas|first8=Simon|last8=Parfitt|date=February 24, 2021|journal=] |volume=36|issue=2|pages=191–210|via=] |doi=10.1002/jqs.3270|bibcode=2021JQS....36..191B |doi-access=free}}</ref> | |||
In ], ''in situ'' refers to an artifact that has not been moved from its original place of deposition. In other words, it is stationary, meaning "still." An artifact being ''in situ'' is critical to the interpretation of that artifact and, consequently, of the culture which formed it. Once an artifact's 'find-site' has been recorded, the artifact can then be moved for conservation, further interpretation and display. An artifact that is not discovered ''in situ'' is considered out of context and as not providing an accurate picture of the associated culture. However, the out of context artifact can provide scientists with an example of types and locations of ''in situ'' artifacts yet to be discovered. When excavating a burial site or surface deposit "in situ" refers to cataloging, recording, mapping, photographing human remains in the position they are discovered.<ref>{{cite book|last=Byers|first=Steven|title=Introduction to Forensic Anthropology (4th Edition)|year=2011|publisher=Pearson Education Inc|location=Upper Saddle Ridge, New Jersey}}</ref> | |||
The ] establishes mandatory principles for signatory states regarding ]. Among its directives is the stipulation that ''in situ'' preservation constitutes the preferred methodological approach.<ref name="Renfrew_Bahn"/>{{rp|page=558}}<ref name="UNESCO">{{cite web|title=The UNESCO Convention on the Protection of the Underwater Cultural Heritage |url=https://unesdoc.unesco.org/ark:/48223/pf0000152883 |year=2007 |access-date=2024-10-12 |website=UNESCO Digital Library |publisher=] }}</ref>{{rp|page=13}} This protocol derives from the distinct preservation conditions in underwater environments, where diminished oxygen levels and temperature stability facilitate long-term artifact preservation. The extraction of artifacts from these submerged environments and subsequent exposure to atmospheric conditions typically accelerates deterioration processes, most notably in the ] of ] materials.<ref name="UNESCO"/>{{rp|page=5}} | |||
The label ''in situ'' indicates only that the object has not been "newly" moved. Thus, an archaeological ''in situ'' find may be an object that was historically looted from another place, an item of "booty" of a past war, a traded item, or otherwise of foreign origin. Consequently, the ''in situ'' find site may still not reveal its ], but with further detective work may help uncover links that otherwise would remain unknown. It is also possible for archaeological layers to be reworked on purpose or by accident (by humans, natural forces or animals). For example, in a ] mound, where layers are not typically uniform or horizontal, or in land cleared or tilled for farming. | |||
In archaeological contexts involving ] sites, ''in situ'' documentation encompasses the systematic recording and cataloging of human remains in their original depositional positions, often within complex matrices that incorporate ]s, clothing, and other associated artifacts. ] excavations exemplify the methodological challenges of maintaining ''in situ'' preservation, as the presence of multiple individuals, sometimes numbering in the hundreds, necessitates comprehensive documentation of spatial relationships and contextual elements prior to the determination of individual identification, causes of death, and other ] parameters.<ref>{{cite journal |last1=Tuller |first1=Hugh |last2=Đurić’ |first2=Marija |title=Keeping the pieces together: Comparison of mass grave excavation methodology |journal=] |date=January 2006 |volume=156 |issue=2–3 |page=193 |doi=10.1016/j.forsciint.2004.12.033 |pmid=15896937 }}</ref> | |||
The term ''in situ'' is often used to describe ancient sculpture that was carved in place such as the ] or ]. This distinguishes it from statues that were carved and moved like the ], which was moved in ancient times. | |||
==Art== | ==Art== | ||
{{Further|Site-specific art}} | |||
In art, ''in situ'' refers to a work of art made specifically for a host site, or that a work of art takes into account the site in which it is installed or exhibited. For a more detailed account see: ]. The term can also refer to a work of art created at the site where it is to be displayed, rather than one created in the artist's studio and then installed elsewhere (''e.g.,'' a sculpture carved ''in situ''). | |||
]'s temporary ], such as ''The London Mastaba'' (pictured), exemplify ''in situ'' approach in art.]] | |||
The concept of ''in situ'' in ] emerged as a critical framework during the late 1960s and 1970s, designating artworks conceived and executed for specific spatial contexts. Such works incorporate the site's physical, historical, political, and sociological parameters as integral compositional elements.<ref name="Verner"/>{{rp|pages=160–162}} This methodology stands in contrast to autonomous artistic production, wherein works maintain independence from their eventual display locations.<ref name="Untranslatables_484">{{cite encyclopedia|encyclopedia=Dictionary of Untranslatables: A Philosophical Lexicon |editor-first=Barbara |editor-last=Cassin |editor-link=Barbara Cassin |title=IN SITU (LATIN) |last=Riout |first=Denys |date=9 February 2014 |publisher=] |page=484 |isbn=9781400849918 }}</ref> Theoretical discourse regarding the relevant artworks, particularly through the writings and practices of French ] and sculptor ], emphasized the dialectical relationship between artistic intervention and environmental context.<ref name="Verner">{{cite book|title=Arts, Ecologies, Transitions: Constructing a Common Vocabulary |first=Lorraine |last=Verner |editor-last1=Barbanti |editor-first1=Roberto |editor-last2=Ginot |editor-first2=Isabelle |editor-last3=Solomos |editor-first3=Makis |editor-last4=Sorin |editor-first4=Cécile |chapter=40. Site Specificity |isbn=9781003852407 |publisher=] |year=2024 |url=https://books.google.com/books?id=J2fwEAAAQBAJ |via=] |access-date=2024-10-24 }}</ref>{{rp|page=161}} | |||
The site-specific ] of ] serve as notable examples of applying ''in situ'' principles in art. Their architectural interventions, characterized by the systematic wrapping of built structures and landscape elements in textile materials, effected temporary spatial reconfigurations that altered public perception of established environments, as seen in '']'' (1985) and '']'' (1995). The approach to ''in situ'' practice underwent further development through the ] movement, wherein practitioners such as ] and ] integrated their works directly into terrestrial environments, forging inextricable relationships between artistic intervention and geographical context.<ref name="Untranslatables_484"/> Within contemporary ] discourse, the term ''in situ'' has evolved into a theoretical construct, denoting artistic methodologies predicated on the essential unity of work and site.<ref name="Verner"/>{{rp|pages=160–161}} | |||
==Astronomy== | ==Astronomy== | ||
A fraction of the ] in ], as well as those in other massive galaxies, might have formed ''in situ''. The rest might have been accreted from now |
A fraction of the ] in the ], as well as those in other massive galaxies, might have formed ''in situ''. The rest might have been accreted from now-defunct dwarf galaxies. | ||
In astronomy, ''in situ'' also refers to ''in situ'' ], in which planets are hypothesized to have formed at the orbital distance they are currently observed<ref>{{cite journal |last1=Chiang |first1=Eugene |last2=Laughlin |first2=Gregory |title=The minimum-mass extrasolar nebula: in situ formation of close-in super-Earths |journal=Monthly Notices of the Royal Astronomical Society |date=June 2013 |volume=431 |issue=4 |pages=3444–3455 |doi=10.1093/mnras/stt424 |doi-access=free |bibcode=2013MNRAS.431.3444C |arxiv=1211.1673 }}</ref> | |||
rather than to have migrated from a different orbit (referred to as ''ex situ'' formation<ref name=dangelo_bodenheimer_2016>{{cite journal |last1=D’Angelo |first1=Gennaro |last2=Bodenheimer |first2=Peter |title=In Situ and Ex Situ Formation Models of Kepler 11 Planets |journal=The Astrophysical Journal |date=September 2016 |volume=828 |issue=1 |pages=33 |doi=10.3847/0004-637X/828/1/33 |doi-access=free |arxiv=1606.08088 |bibcode=2016ApJ...828...33D }}</ref>). | |||
==Biology and biomedical engineering== | ==Biology and biomedical engineering== | ||
] '']'' photographed ''in situ'']] | ], species '']'', photographed ''in situ'']] | ||
In ] and ], ''in situ'' means to examine the phenomenon exactly in place where it occurs (i.e., without moving it to some special medium). | In ] and ], ''in situ'' means to examine the phenomenon exactly in place where it occurs (i.e., without moving it to some special medium). | ||
In the case of observations or photographs of living animals, it means that the organism was observed (and photographed) in the wild, exactly as it was found and exactly where it was found. The organism had not been moved to another (perhaps more convenient) location such as an aquarium. | In the case of observations or photographs of living animals, it means that the organism was observed (and photographed) in the wild, exactly as it was found and exactly where it was found. This means it was not taken out of the area. The organism had not been moved to another (perhaps more convenient) location such as an aquarium. | ||
This phrase ''in situ'' when used in laboratory science such as cell science can mean something intermediate between '']'' and '']''. For example, examining a ] within a whole ] intact and under ] may be ''in situ'' investigation. This would not be ''in vivo'' as the donor is sacrificed by experimentation, but it would not be the same as working with the cell alone (a common scenario for ''in vitro'' experiments). | This phrase ''in situ'' when used in laboratory science such as cell science can mean something intermediate between '']'' and '']''. For example, examining a ] within a whole ] intact and under ] may be ''in situ'' investigation. This would not be ''in vivo'' as the donor is sacrificed by experimentation, but it would not be the same as working with the cell alone (a common scenario for ''in vitro'' experiments). For instance, an example of biomedical engineering ''in situ'' involves the procedures to directly create an implant from a patient's own tissue within the confines of the ].<ref>{{Cite journal |last1=Krasilnikova |first1=O.A. |last2=Baranovskii |first2=D.S. |last3=Yakimova |first3=A.O. |last4=Arguchinskaya |first4=N. |last5=Kisel |first5=A. |last6=Sosin |first6=D. |last7=Sulina |first7=Y. |last8=Ivanov |first8=S.A. |last9=Shegay |first9=P.V. |last10=Kaprin |first10=A.D. |last11=Klabukov |first11=I.D. |date=2022 |title=Intraoperative Creation of Tissue-Engineered Grafts with Minimally Manipulated Cells: New Concept of Bone Tissue Engineering In Situ |journal=Bioengineering |volume=9 |issue=11 |pages=704 |doi=10.3390/bioengineering9110704 |issn=2306-5354 |pmc=9687730 |pmid=36421105 |doi-access=free }}</ref> | ||
''In vitro'' was among the first attempts to qualitatively and quantitatively analyze natural occurrences in the lab. Eventually, the limitation of ''in vitro'' experimentation was that they were not conducted in natural environments. To compensate for this problem, ''in vivo'' experimentation allowed testing to occur in the original organism or environment. To bridge the dichotomy of benefits associated with both methodologies, ''in situ'' experimentation allowed the controlled aspects of ''in vitro'' to become coalesced with the natural environmental compositions of ''in vivo'' experimentation. | ''In vitro'' was among the first attempts to qualitatively and quantitatively analyze natural occurrences in the lab. Eventually, the limitation of ''in vitro'' experimentation was that they were not conducted in natural environments. To compensate for this problem, ''in vivo'' experimentation allowed testing to occur in the original organism or environment. To bridge the dichotomy of benefits associated with both methodologies, ''in situ'' experimentation allowed the controlled aspects of ''in vitro'' to become coalesced with the natural environmental compositions of ''in vivo'' experimentation. | ||
In conservation of ], "]" (also "on-site ]") is the process of protecting an ] ] or ] ] in its natural ], as opposed to ] (also "off-site conservation"). | In conservation of ], "]" (also "on-site ]") is the process of protecting an ] ] or ] ] in its natural ], as opposed to ] (also "off-site conservation").{{cn|date=August 2024}} | ||
==Chemistry and chemical engineering== | ==Chemistry and chemical engineering== | ||
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There are numerous situations in which chemical intermediates are synthesized ''in situ'' in various processes. This may be done because the species is unstable, and cannot be isolated, or simply out of convenience. Examples of the former include the ] and ]. | There are numerous situations in which chemical intermediates are synthesized ''in situ'' in various processes. This may be done because the species is unstable, and cannot be isolated, or simply out of convenience. Examples of the former include the ] and ]. | ||
In biomedical engineering, protein nanogels made by the ''in situ'' polymerization method provide a versatile platform for storage and release of therapeutic proteins. It has tremendous applications for cancer treatment, vaccination, diagnosis, regenerative medicine, and therapies for loss-of-function genetic diseases.<ref name="ReferenceA">{{cite journal|last1=Ye|first1=Yanqi|last2=Yu|first2=Jicheng|last3=Gu|first3=Zhen|year=2015|title=Versatile Protein Nanogels Prepared by In Situ Polymerization|journal=Macromolecular Chemistry and Physics|volume=217|issue=3|pages=333–343|doi=10.1002/macp.201500296}}</ref> | |||
⚫ | In chemical engineering, ''in situ'' often refers to industrial plant "operations or procedures that are performed in place |
||
⚫ | In chemical engineering, ''in situ'' often refers to industrial plant "operations or procedures that are performed in place." For example, aged catalysts in industrial reactors may be regenerated in place (''in situ'') without being removed from the reactors. | ||
==Civil engineering== | ==Civil engineering== | ||
In ] and ], ''in situ'' refers to construction which is carried out at the building site using raw materials |
In ] and ], ''in situ'' refers to construction which is carried out at the building site using raw materials - as opposed to ''prefabricated'' construction, in which building components are made in a factory and then transported to the building site for assembly. For example, ]s may be cast ''in situ'' (also "cast-in-place") or ''prefabricated''. | ||
''In situ'' techniques are often more labour-intensive, and take longer, but the materials are cheaper, and the work is versatile and adaptable. ''Prefabricated'' techniques are usually much quicker, therefore saving money on labour costs, but factory-made parts can be expensive. They are also inflexible, and must often be designed on a grid, with all details fully calculated in advance. Finished units may require special handling due to excessive dimensions. | |||
The phrase may also refer to those assets which are present at or near a project site. In this case, it is used to designate the state of an unmodified sample taken from a given stockpile. | The phrase may also refer to those assets which are present at or near a project site. In this case, it is used to designate the state of an unmodified sample taken from a given stockpile. | ||
Site construction usually involves grading the existing soil surface so that material is "cut" out of one area and "filled" in another area creating a flat pad on an existing slope. |
Site construction usually involves grading the existing soil surface so that material is "cut" out of one area and "filled" in another area creating a flat pad on an existing slope. The term "in situ" distinguishes soil still in its existing condition from soil modified (filled) during construction. The differences in the soil properties for supporting building loads, accepting underground utilities, and infiltrating water persist indefinitely. | ||
==Computer science== | ==Computer science== | ||
{{citation needed span|text=In ] an ''in situ'' operation is one that occurs without interrupting the normal state of a system|date=June 2015}}. For example, a file backup may be restored over a running system, without needing to take the system down to perform the restore. In the context of a database, a restore would allow the database system to continue to be available to users while a restore happened. An ''in situ'' upgrade would allow an ], ] or ] to be upgraded while the system was still running, perhaps without the need to reboot it, depending on the sophistication of the system. | |||
A use of the term in-situ that appears in Computer Science focuses primarily on the use of technology and user interfaces to provide continuous access to situationally relevant information in various locations and contexts.<ref>{{cite journal |last1=Ens |first1=Barrett |last2=Irani |first2=Pourang |title=Spatial Analytic Interfaces: Spatial User Interfaces for In Situ Visual Analytics |journal=IEEE Computer Graphics and Applications |date=March 2017 |volume=37 |issue=2 |pages=66–79 |doi=10.1109/MCG.2016.38 |pmid=28113834 }}</ref><ref>{{cite journal |last1=Willett |first1=Wesley |last2=Jansen |first2=Yvonne |last3=Dragicevic |first3=Pierre |title=Embedded Data Representations |journal=IEEE Transactions on Visualization and Computer Graphics |date=January 2017 |volume=23 |issue=1 |pages=461–470 |doi=10.1109/TVCG.2016.2598608 |pmid=27875162 |url=https://hal.inria.fr/hal-01377901/file/embedded-data-representations.pdf }}</ref> Examples include athletes viewing biometric data on smartwatches to improve their performance,<ref>{{cite book |doi=10.1145/3154862.3154879 |chapter=Data representations for in-situ exploration of health and fitness data |title=Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare |date=2017 |last1=Amini |first1=Fereshteh |last2=Hasan |first2=Khalad |last3=Bunt |first3=Andrea |last4=Irani |first4=Pourang |pages=163–172 |isbn=978-1-4503-6363-1 }}</ref> a presenter looking at tips on a smart glass to reduce their speaking rate during a speech,<ref>{{cite book |doi=10.1145/2678025.2701386 |chapter=Rhema: A Real-Time In-Situ Intelligent Interface to Help People with Public Speaking |title=Proceedings of the 20th International Conference on Intelligent User Interfaces |date=2015 |last1=Tanveer |first1=M. Iftekhar |last2=Lin |first2=Emy |last3=Hoque |first3=Mohammed (Ehsan) |pages=286–295 |isbn=978-1-4503-3306-1 }}</ref> or technicians receiving online and stepwise instructions for repairing an engine. | |||
{{citation needed span|text=An ] is said to be an ], if the extra amount of memory required to execute the algorithm is ]|date=June 2015}}, that is, does not exceed a constant no matter how large the input. For example, ] is an ''in situ'' sorting algorithm. | |||
An ] is said to be an ], if the extra amount of memory required to execute the algorithm is ],<ref>{{cite journal |last1=Munro |first1=J. Ian |last2=Raman |first2=Venkatesh |last3=Salowe |first3=Jeffrey S. |title=Stable in situ sorting and minimum data movement |journal=BIT |date=June 1990 |volume=30 |issue=2 |pages=220–234 |doi=10.1007/BF02017344 }}</ref> that is, does not exceed a constant no matter how large the input. Typically such an algorithm operates on ] directly in place rather than making copies of them. | |||
In designing ]s, {{citation needed span|text=the term ''in situ'' means that a particular user action can be performed without going to another window|date=June 2015}}, for example, if a word processor displays an image and allows you to edit the image without launching a separate image editor, this is called ''in situ editing.'' | |||
For example, ] is an ''in situ'' sorting algorithm, which sorts the elements of an array in place. ] is an ''in situ'' sorting algorithm, but in the worst case it requires linear space on the call stack (this can be reduced to log space). Merge sort is generally not written as an ''in situ'' algorithm. | |||
⚫ | |||
AJAX partial page data updates is another example of ''in situ'' in a Web UI/UX context. ''Web 2.0'' included AJAX and the concept of asynchronous requests to servers to replace a portion of a web page with new data, without reloading | |||
the entire page, as the early HTML model dictated. Arguably, ''all'' asynchronous data transfers or ''any'' background task is ''in situ'' as the normal state is normally unaware of background tasks, usually notified on completion | |||
by a callback mechanism. | |||
⚫ | With ], in situ data would mean bringing the computation to where data is located, rather than the other way like in traditional RDBMS systems where data is moved to computational space.<ref>{{Cite web|url=https://www.flashmemorysummit.com/English/Collaterals/Proceedings/2014/20140806_202E_Alves.pdf|title=In-Situ Processing Presentation|last=Alves|first=Vladimir|date=August 2014}}</ref> This is also known as ]. | ||
==Design and advertising== | ==Design and advertising== | ||
In design and advertising the term typically means the superimposing of theoretical design elements onto photographs of real world locations. This is a pre-visualization tool to aid in illustrating a proof of concept. | In design and advertising the term typically means the superimposing of theoretical design elements onto photographs of real world locations. This is a pre-visualization tool to aid in illustrating a proof of concept.{{cn|date=August 2024}} | ||
==Earth and atmospheric sciences== | ==Earth, ocean and atmospheric sciences== | ||
In ] and the ]s, ''in situ'' typically describes natural material or processes prior to transport. For example, ''in situ'' is used in relation to the distinction between ] and ], the difference being that erosion requires a transport medium (such as ], ], or ]), whereas weathering occurs ''in situ''. ] processes are also often described as occurring to material ''in situ''. | In ] and the ]s, ''in situ'' typically describes natural material or processes prior to transport. For example, ''in situ'' is used in relation to the distinction between ] and ], the difference being that erosion requires a transport medium (such as ], ], or ]), whereas weathering occurs ''in situ''. ] processes are also often described as occurring to material ''in situ''. | ||
In ], ''in situ'' generally refers to observational methods made by obtaining direct samples of the ocean state, such as that obtained by shipboard surveying using a lowered ] rosette that directly measure ocean ], ], pressure and other ] quantities like dissolved oxygen. Historically a ] would be used to record the ocean temperature at a particular depth and a ] used to capture and bring water samples back to the ocean surface for further analysis of the physical, chemical or biological composition. | |||
⚫ | In the ], ''in situ'' refers to obtained through direct contact with the respective subject, such as a ] measuring a parcel of air or an ] measuring wind, as opposed to ] such as weather ] or ]. | ||
⚫ | {{Anchor|atmospheric science}} In the ], ''in situ'' refers to obtained through direct contact with the respective subject, such as a ] measuring a parcel of air or an ] measuring wind, as opposed to ] such as weather ] or ]. | ||
==Economics== | ==Economics== | ||
In economics, ''in situ'' is used when referring to the ''in place'' storage of a product, usually a natural resource. More generally, it refers to any situation where there is no out-of-pocket cost to store the product so that the only storage cost is the opportunity cost of waiting longer to get your money when the product is eventually sold. Examples of ''in situ'' storage would be oil and gas wells, all types of mineral and gem mines, stone quarries, timber that has reached an age where it could be harvested, and agricultural products that do not need a physical storage facility such as hay. | In economics, ''in situ'' is used when referring to the ''in place'' storage of a product, usually a natural resource. More generally, it refers to any situation where there is no out-of-pocket cost to store the product so that the only storage cost is the ] of waiting longer to get your money when the product is eventually sold. Examples of ''in situ'' storage would be oil and gas wells, all types of mineral and gem mines, stone quarries, timber that has reached an age where it could be harvested, and agricultural products that do not need a physical storage facility such as hay. | ||
==Electrochemistry== | ==Electrochemistry== | ||
In ], the phrase in situ refers to performing electrochemical experiments under operating conditions of the electrochemical cell, i.e., under potential control. This is opposed to doing ex situ experiments that are performed under the absence of potential control. Potential control preserves the electrochemical environment essential to maintain the double layer structure intact and the electron transfer reactions occurring at that particular potential in the electrode/electrolyte interphasial region. | In ], the phrase ''in situ'' refers to performing electrochemical experiments under operating conditions of the electrochemical cell, i.e., under potential control. This is opposed to doing ''ex situ'' experiments that are performed under the absence of potential control. Potential control preserves the electrochemical environment essential to maintain the double layer structure intact and the electron transfer reactions occurring at that particular potential in the electrode/electrolyte interphasial region. | ||
==Environmental remediation== | ==Environmental remediation== | ||
''In situ'' can refer to where a clean up or ] of a ] site is performed using and |
''In situ'' can refer to where a clean up or ] of a ] site is performed using and stimulating the natural processes in the ], contrary to '']'' where contaminated soil is excavated and cleaned elsewhere, off site. | ||
==Experimental physics== | ==Experimental physics== | ||
{{Main article|In situ electron microscopy}} | |||
In ] "''in situ''" typically refers to a method of data collection or manipulation of a sample without exposure to an external environment. For example, the Si(111) 7x7 surface reconstruction is visible using a ] when it is prepared and analyzed ''in situ''. | |||
In ] (TEM) and ] (STEM), ''in situ'' refers to the observation of materials as they are exposed to external stimuli within the microscope, under conditions that mimic their natural environments. This enables real-time observation of material behavior at the ]. External stimuli in ''in situ'' TEM/STEM experiments include mechanical loading and pressure, temperature changes, electrical currents (]), ], and environmental factors—such as exposure to gas, liquid, and ]—or any combination of these. These conditions allow researchers to study atomic-level processes such as ]s, chemical reactions, or ], providing insights into material behavior and properties essential for advancements in ].<ref>{{cite book |doi=10.1002/9783527834822.ch1 |page=3 |title=In-Situ Transmission Electron Microscopy Experiments |chapter=Chapter 1. In-Situ TEM |date=2023 |last1=Sharma |first1=Renu |isbn=978-3-527-34798-8 }}</ref><ref>{{cite journal <!-- Citation bot bypass-->|last1=Sharma |first1=Renu |last2=Yang |first2=Wei-Chang David |title=Perspective and prospects of in situ transmission/scanning transmission electron microscopy |journal=Microscopy |date=8 April 2024 |volume=73 |issue=2 |page=79 |doi=10.1093/jmicro/dfad057 |pmid=38006307 }}</ref> | |||
==Experimental psychology== | ==Experimental psychology== | ||
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==Gastronomy== | ==Gastronomy== | ||
In ], "in situ"<!-- or "in situs" --> refers to the art of cooking with the different resources that are available |
In ], "in situ"<!-- or "in situs" --> refers to the art of cooking with the different resources that are available at the site of the event. Here a person is not going to the restaurant, but the restaurant comes to the person's home.<ref>{{cite book|last1=Gillespie|first1=Cailein|last2=Cousins|first2=John A.|title=European Gastronomy into the 21st Century|date=2001|publisher=Elsevier|location=Oxford, UK|isbn=978-0-7506-5267-4|pages=72|url=https://books.google.com/books?id=2G5cihKVlOIC&q=in+situ+gastronomy&pg=PA72|access-date=16 June 2014}}</ref> | ||
==Law== | ==Law== | ||
In ] contexts, ''in situ'' is often used for its literal meaning. For example, in ], |
In ] contexts, ''in situ'' is often used for its literal meaning. For example, in ], in-situ land exchange refers to a mechanism where landowners can swap their existing or expired ]s with new ] for the same land parcel. This approach facilitates redevelopment while preserving the property's original location.<ref>{{Cite web|url=https://www.devb.gov.hk/en/publications_and_press_releases/press/index_id_12712.html|title=DEVB Press Releases: Revised in-situ land exchange arrangements for Northern Metropolis to enhance speed and efficiency by leveraging market forces |website=devb.gov.hk |year=2021 |access-date=2024-11-06 |publisher=] }}</ref> | ||
In the field of recognition of governments under public international law the term ''in situ'' is used to distinguish between an ] and a government with effective control over the territory, i.e. the government ''in situ''. | In the field of recognition of governments under public international law the term ''in situ'' is used to distinguish between an ] and a government with effective control over the territory, i.e. the government ''in situ''. | ||
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==Literature== | ==Literature== | ||
In ] ''in situ'' is used to describe a condition. The ], for example, was originally erected in a courtyard, for public viewing. Most pictures of the famous stone are not ''in situ'' pictures of it erected, as it would have been originally. The stone was uncovered as part of building material, within a wall. Its |
In ] ''in situ'' is used to describe a condition. The ], for example, was originally erected in a courtyard, for public viewing. Most pictures of the famous stone are not ''in situ'' pictures of it erected, as it would have been originally. The stone was uncovered as part of building material, within a wall. Its ''in situ'' condition today is that it is erected, vertically, on public display at the ] in London, England.{{cn|date=November 2024}} | ||
==Medicine== | ==Medicine== | ||
{{anchor|cancer}} | |||
]]] | |||
The term ''in situ'' in the medical context is part of a group of two-word Latin expressions, including '']'', '']'', and '']''. Similar to abbreviations, these terms support the concise transfer of essential information in medical communication. ''In situ'', specifically, is among the most widely used and versatile ] in modern times.<ref name="Lysanets et al">{{cite journal | doi=10.1186/s13256-018-1562-x | doi-access=free | title=The use of Latin terminology in medical case reports: Quantitative, structural, and thematic analysis | date=2018 | last1=Lysanets | first1=Yuliia V. | last2=Bieliaieva | first2=Olena M. | journal=] | volume=12 | issue=1 | page=45 | pmid=29471882 | pmc=5824564 }}</ref> | |||
], not having invaded beyond the ]]] | |||
In ]: for a ], '']'' means that ] cells are present as a tumor but have not metastasized, or invaded, beyond the basement membrane of where the tumor was discovered. This can happen anywhere in the body, such as the skin, breast tissue, or lung. This type of tumor can often, depending on where it is located, be removed by ]. | |||
In ], ''in situ'' is commonly applied in the context of ] (CIS), a term describing abnormal cells confined to their original location without ] of surrounding tissue.<ref name="Lysanets et al"/><ref>{{cite encyclopedia|title=carcinoma in situ |url=https://www.cancer.gov/publications/dictionaries/cancer-terms/def/carcinoma-in-situ |encyclopedia=NCI Dictionary of Cancer Terms |publisher=] |access-date=2024-11-05 }}</ref> CIS is a critical term in early ], as it signifies a non-invasive stage, allowing for more targeted interventions before potential progression. Similarly, melanoma ''in situ'' is an early, localized form of ], a type of malignant ]. In this stage, the cancerous ]s—the pigment-producing cells that give skin its color—are confined to the ], the outermost layer of the ]. The melanoma has not yet penetrated into the deeper dermal layers of the skin or ]d to other parts of the body.<ref>{{cite book|title=Histological Diagnosis of Nevi and Melanoma |url=https://books.google.com/books?id=G_zEBAAAQBAJ |first1=Guido |last1=Massi |first2=Philip E. |last2=LeBoit |year=2013 |via=] |isbn=9783642373114 |publisher=] |page=421 |chapter=Chapter 28. Melanoma in Situ }}</ref> | |||
In ]: ''in situ'' refers to viewing structures as they appear in normal healthy bodies. For example, one can open up a ]'s abdominal cavity and view the liver ''in situ'' or one can look at an isolated liver that has been removed from the cadaver's body. | |||
Beyond oncology, ''in situ'' applies to fields that require maintenance of natural anatomical or physiological positions.<ref name="Lysanets et al"/> In ], for example, the term describes procedures where ] such as bone screws are placed without altering the original alignment of the bone, as in " was treated operatively with an ''in situ'' cannulated hip screw fixation".<ref>{{cite journal | doi=10.1186/1752-1947-6-136 | doi-access=free | title=A novel diagnostic sign of hip fracture mechanism in ground level falls: Two case reports and review of the literature | date=2012 | last1=Kelly | first1=Douglas W. | last2=Kelly | first2=Brian D. | journal=] | volume=6 | page=136 | pmid=22643013 | pmc=3423009 }}</ref> | |||
In ], "in situ" describes any devices or appliances on the patient's body that remain in their desired and optimal position. | |||
==Mining== | ==Mining== | ||
{{Main|In situ leach}} | |||
⚫ | ''In situ |
||
⚫ | ''In situ'' leaching or ''in situ'' recovery refers to the mining technique of injecting ] underground to dissolve ore and bringing the pregnant leach solution to surface for extraction. Commonly used in uranium mining but has also been used for copper mining.<ref> {{Webarchive|url=https://web.archive.org/web/20090424213134/http://www.world-nuclear.org/info/inf27.html |date=24 April 2009 }}. world-nuclear.org</ref> | ||
==Petroleum production== | ==Petroleum production== | ||
''In situ'' refers to recovery techniques which apply heat or solvents to ] or ] reservoirs beneath the |
''In situ'' refers to recovery techniques which apply heat or solvents to ] or ] reservoirs beneath the Earth's crust. There are several varieties of ''in situ'' techniques, but the ones which work best in the ] use heat (steam). | ||
The most common type of ''in situ'' petroleum production is referred to as SAGD (]) this is becoming very popular in the Alberta Oil Sands. | The most common type of ''in situ'' petroleum production is referred to as SAGD (]) this is becoming very popular in the Alberta Oil Sands. | ||
==RF transmission== | ==RF transmission== | ||
In ] (RF) transmission systems, ''in situ'' is often used to describe the location of various components while the system is in its standard transmission mode, rather than operation in a test mode. For example, if an ''in situ'' ] is used in a commercial broadcast transmission system, the |
In ] (RF) transmission systems, ''in situ'' is often used to describe the location of various components while the system is in its standard transmission mode, rather than operation in a test mode. For example, if an ''in situ'' ] is used in a commercial broadcast transmission system, the wattmeter can accurately measure power while the station is "on air." | ||
==Space |
==Space science== | ||
{{Main|In situ resource utilization}} | |||
⚫ | Future space exploration or ] may rely on obtaining supplies ''in situ'', such as previous plans to power the ] with fuel minable on the |
||
⚫ | Future space exploration or ] may rely on obtaining supplies ''in situ'', such as previous plans to power the ] with fuel minable on the Moon. The ] mission concept is based primarily on the ''in situ'' fuel production using the ], which produces methane and water from a reaction of hydrogen and carbon dioxide. | ||
In the ], ''in situ'' refers to measurements of the particle and field environment that the satellite is embedded in, such as the detection of energetic particles in the ], or magnetic field measurements from a ]. | In the ], ''in situ'' refers to measurements of the particle and field environment that the satellite is embedded in, such as the detection of energetic particles in the ], or magnetic field measurements from a ]. | ||
==Urban |
==Urban planning== | ||
⚫ | In urban planning, in-situ upgrading is an approach to and method of upgrading ]s.<ref>{{cite journal|last1=Huchzermeyer|first1=Marie|title=The struggle for in situ upgrading of informal settlements: A reflection on cases in Gauteng|journal=Development Southern Africa|date=2009|volume=26|issue=1|pages=59–74|doi=10.1080/03768350802640099|s2cid=153687182}}</ref> | ||
⚫ | In urban planning, in-situ upgrading is an approach to and method of upgrading ]s.<ref>{{cite journal|last1=Huchzermeyer|first1=Marie|title=The struggle for in situ upgrading of informal settlements: A reflection on cases in Gauteng|journal=Development Southern Africa|date=2009|volume=26|issue=1|pages=59–74}}</ref> | ||
==Vacuum technology== | ==Vacuum technology== | ||
In ], ''in situ'' baking refers to heating parts of the vacuum system while they are under vacuum in order to drive off volatile substances that may be ] or ] on the walls so they cannot cause ]. | In ], ''in situ'' baking refers to heating parts of the vacuum system while they are under vacuum in order to drive off volatile substances that may be ] or ] on the walls so they cannot cause ].{{cn|date=August 2024}} | ||
==Road assistance == | |||
The term ''in situ'', used as "repair in situ", means to repair a vehicle at the place where it has a breakdown. | |||
==See also== | ==See also== | ||
{{ |
{{Wiktionary}} | ||
* '']'' | |||
* '']'' | |||
* '']'' | |||
* '']'' | |||
* '']'' | |||
* '']'' | |||
* ] | * ] | ||
* ] | * ] | ||
* ] | * ] | ||
* ] | * ] | ||
* {{lookfrom}} | |||
==Notes== | |||
{{notelist}} | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
{{DEFAULTSORT:In Situ}} | |||
] | ] | ||
] | ] | ||
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Latest revision as of 10:49, 1 December 2024
Latin phrase that translates literally to 'on site' Not to be confused with Insitu, Inc..This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "In situ" – news · newspapers · books · scholar · JSTOR (December 2016) (Learn how and when to remove this message) |
In situ is a Latin phrase meaning "in place" or "on site", derived from in ("in") and situ (ablative of situs, "place"). The term refers to the examination or preservation of phenomena within their original place or context. This methodological approach, used across diverse disciplines, maintains contextual integrity essential for accurate analysis. Conversely, ex situ methods examine subjects outside their original context.
The natural sciences frequently implement in situ methodologies. Geological studies employ field analysis of soil composition and rock formations, while environmental science relies on direct ecosystem monitoring to obtain accurate environmental data. Biological field research examines organisms in their natural habitats, revealing behavioral patterns and ecological interactions that laboratory settings cannot replicate. In chemistry and experimental physics, in situ techniques enable the observation of substances and reactions under native conditions, facilitating the documentation of dynamic processes.
In situ applications extend to various applied sciences as well. Aerospace industry implements on-site inspection protocols and monitoring systems for operational evaluation without system interruption. In medical terminology, particularly oncology, in situ designates early-stage cancers that remain confined to their point of origin. This diagnostic classification—indicating no invasion of adjacent tissues—serves as a determinant for treatment protocols and prognostic assessment. Space exploration utilizes in situ planetary research methods, conducting direct observational studies and data collection on celestial bodies, thereby avoiding the complexities inherent in sample-return missions.
The humanities, notably archaeology, employ in situ methodologies to maintain contextual authenticity. Archaeological investigations preserve the spatial relationships and environmental conditions of artifacts at excavation sites, enabling more precise historical analysis. In art theory and practice, the in situ principle guides both creation and exhibition. Site-specific artworks, such as environmental sculptures or architectural installations, demonstrate deliberate integration with their designated locations. This contextual placement establishes a methodological framework that emphasizes the relationship between artistic works and their environmental or cultural settings.
Aerospace industry
In aerospace structural health monitoring, in situ inspection denotes diagnostic methodologies that evaluate components within their operational environments—eliminating the need for disassembly or service interruption. The nondestructive testing (NDT) techniques employed for in situ damage detection include: infrared thermography, which measures thermal emissions to identify structural anomalies; speckle shearing interferometry (also known as shearography), which analyzes surface deformation patterns; and ultrasonic testing, which uses sound wave propagation to detect internal defects in composite materials. Each technique exhibits characteristic operational constraints. Infrared thermography exhibits reduced effectiveness on low-emissivity materials, shearography requires carefully controlled environmental conditions, and ultrasonic testing protocols can be time-intensive for large structural components. Nevertheless, the systematic integration of these complementary methodologies substantially enhances overall diagnostic capabilities.
An additional approach involves the use of alternating current (AC) and direct current (DC) sensor arrays in real-time monitoring applications, facilitating in situ detection of structural degradation phenomena—including matrix discontinuities, interlaminar delaminations, and fiber fracture mechanisms—through quantitative analysis of electrical resistance and capacitance variations within composite laminate configurations.
Archaeology
In archaeological methodology, the term in situ designates artifacts and other materials that maintain their original depositional context, undisturbed since their initial deposition. The systematic documentation of spatial coordinates, stratigraphic position, and associated matrices of in situ materials enables the reconstruction of historical processes and cultural practices. While artifacts frequently require extraction for analytical purposes, archaeological features—including hearths, postholes, and architectural foundations—necessitate comprehensive in situ documentation to preserve contextual data during stratigraphic excavation. Documentation protocols encompass multiple recording methodologies: detailed field notation, scaled technical drawings, cartographic representation, and high-resolution photographic documentation. Contemporary archaeological practice incorporates advanced digital technologies, including 3D laser scanning, photogrammetry, unmanned aerial vehicles, and Geographic Information Systems (GIS), to capture complex spatial relationships. Materials recovered from secondary contexts (ex situ), including those displaced through non-professional excavation activities, demonstrate diminished interpretive value; however, such assemblages may provide diagnostic indicators regarding the spatial distribution and typological characteristics of unexcavated in situ deposits, thereby informing subsequent excavation plans.
The Convention on the Protection of the Underwater Cultural Heritage establishes mandatory principles for signatory states regarding underwater shipwrecks. Among its directives is the stipulation that in situ preservation constitutes the preferred methodological approach. This protocol derives from the distinct preservation conditions in underwater environments, where diminished oxygen levels and temperature stability facilitate long-term artifact preservation. The extraction of artifacts from these submerged environments and subsequent exposure to atmospheric conditions typically accelerates deterioration processes, most notably in the oxidation of ferrous materials.
In archaeological contexts involving burial sites, in situ documentation encompasses the systematic recording and cataloging of human remains in their original depositional positions, often within complex matrices that incorporate sediments, clothing, and other associated artifacts. Mass grave excavations exemplify the methodological challenges of maintaining in situ preservation, as the presence of multiple individuals, sometimes numbering in the hundreds, necessitates comprehensive documentation of spatial relationships and contextual elements prior to the determination of individual identification, causes of death, and other forensic parameters.
Art
Further information: Site-specific artThe concept of in situ in contemporary art emerged as a critical framework during the late 1960s and 1970s, designating artworks conceived and executed for specific spatial contexts. Such works incorporate the site's physical, historical, political, and sociological parameters as integral compositional elements. This methodology stands in contrast to autonomous artistic production, wherein works maintain independence from their eventual display locations. Theoretical discourse regarding the relevant artworks, particularly through the writings and practices of French conceptual artist and sculptor Daniel Buren, emphasized the dialectical relationship between artistic intervention and environmental context.
The site-specific installations of Christo and Jeanne-Claude serve as notable examples of applying in situ principles in art. Their architectural interventions, characterized by the systematic wrapping of built structures and landscape elements in textile materials, effected temporary spatial reconfigurations that altered public perception of established environments, as seen in The Pont Neuf Wrapped (1985) and Wrapped Reichstag (1995). The approach to in situ practice underwent further development through the land art movement, wherein practitioners such as Robert Smithson and Michael Heizer integrated their works directly into terrestrial environments, forging inextricable relationships between artistic intervention and geographical context. Within contemporary aesthetic discourse, the term in situ has evolved into a theoretical construct, denoting artistic methodologies predicated on the essential unity of work and site.
Astronomy
A fraction of the globular star clusters in the Milky Way Galaxy, as well as those in other massive galaxies, might have formed in situ. The rest might have been accreted from now-defunct dwarf galaxies.
In astronomy, in situ also refers to in situ planet formation, in which planets are hypothesized to have formed at the orbital distance they are currently observed rather than to have migrated from a different orbit (referred to as ex situ formation).
Biology and biomedical engineering
In biology and biomedical engineering, in situ means to examine the phenomenon exactly in place where it occurs (i.e., without moving it to some special medium).
In the case of observations or photographs of living animals, it means that the organism was observed (and photographed) in the wild, exactly as it was found and exactly where it was found. This means it was not taken out of the area. The organism had not been moved to another (perhaps more convenient) location such as an aquarium.
This phrase in situ when used in laboratory science such as cell science can mean something intermediate between in vivo and in vitro. For example, examining a cell within a whole organ intact and under perfusion may be in situ investigation. This would not be in vivo as the donor is sacrificed by experimentation, but it would not be the same as working with the cell alone (a common scenario for in vitro experiments). For instance, an example of biomedical engineering in situ involves the procedures to directly create an implant from a patient's own tissue within the confines of the Operating Room.
In vitro was among the first attempts to qualitatively and quantitatively analyze natural occurrences in the lab. Eventually, the limitation of in vitro experimentation was that they were not conducted in natural environments. To compensate for this problem, in vivo experimentation allowed testing to occur in the original organism or environment. To bridge the dichotomy of benefits associated with both methodologies, in situ experimentation allowed the controlled aspects of in vitro to become coalesced with the natural environmental compositions of in vivo experimentation.
In conservation of genetic resources, "in situ conservation" (also "on-site conservation") is the process of protecting an endangered plant or animal species in its natural habitat, as opposed to ex situ conservation (also "off-site conservation").
Chemistry and chemical engineering
In chemistry, in situ typically means "in the reaction mixture."
There are numerous situations in which chemical intermediates are synthesized in situ in various processes. This may be done because the species is unstable, and cannot be isolated, or simply out of convenience. Examples of the former include the Corey-Chaykovsky reagent and adrenochrome.
In biomedical engineering, protein nanogels made by the in situ polymerization method provide a versatile platform for storage and release of therapeutic proteins. It has tremendous applications for cancer treatment, vaccination, diagnosis, regenerative medicine, and therapies for loss-of-function genetic diseases.
In chemical engineering, in situ often refers to industrial plant "operations or procedures that are performed in place." For example, aged catalysts in industrial reactors may be regenerated in place (in situ) without being removed from the reactors.
Civil engineering
In architecture and building, in situ refers to construction which is carried out at the building site using raw materials - as opposed to prefabricated construction, in which building components are made in a factory and then transported to the building site for assembly. For example, concrete slabs may be cast in situ (also "cast-in-place") or prefabricated.
In situ techniques are often more labour-intensive, and take longer, but the materials are cheaper, and the work is versatile and adaptable. Prefabricated techniques are usually much quicker, therefore saving money on labour costs, but factory-made parts can be expensive. They are also inflexible, and must often be designed on a grid, with all details fully calculated in advance. Finished units may require special handling due to excessive dimensions.
The phrase may also refer to those assets which are present at or near a project site. In this case, it is used to designate the state of an unmodified sample taken from a given stockpile.
Site construction usually involves grading the existing soil surface so that material is "cut" out of one area and "filled" in another area creating a flat pad on an existing slope. The term "in situ" distinguishes soil still in its existing condition from soil modified (filled) during construction. The differences in the soil properties for supporting building loads, accepting underground utilities, and infiltrating water persist indefinitely.
Computer science
A use of the term in-situ that appears in Computer Science focuses primarily on the use of technology and user interfaces to provide continuous access to situationally relevant information in various locations and contexts. Examples include athletes viewing biometric data on smartwatches to improve their performance, a presenter looking at tips on a smart glass to reduce their speaking rate during a speech, or technicians receiving online and stepwise instructions for repairing an engine.
An algorithm is said to be an in situ algorithm, or in-place algorithm, if the extra amount of memory required to execute the algorithm is O(1), that is, does not exceed a constant no matter how large the input. Typically such an algorithm operates on data objects directly in place rather than making copies of them.
For example, heapsort is an in situ sorting algorithm, which sorts the elements of an array in place. Quicksort is an in situ sorting algorithm, but in the worst case it requires linear space on the call stack (this can be reduced to log space). Merge sort is generally not written as an in situ algorithm.
AJAX partial page data updates is another example of in situ in a Web UI/UX context. Web 2.0 included AJAX and the concept of asynchronous requests to servers to replace a portion of a web page with new data, without reloading the entire page, as the early HTML model dictated. Arguably, all asynchronous data transfers or any background task is in situ as the normal state is normally unaware of background tasks, usually notified on completion by a callback mechanism.
With big data, in situ data would mean bringing the computation to where data is located, rather than the other way like in traditional RDBMS systems where data is moved to computational space. This is also known as in-situ processing.
Design and advertising
In design and advertising the term typically means the superimposing of theoretical design elements onto photographs of real world locations. This is a pre-visualization tool to aid in illustrating a proof of concept.
Earth, ocean and atmospheric sciences
In physical geography and the Earth sciences, in situ typically describes natural material or processes prior to transport. For example, in situ is used in relation to the distinction between weathering and erosion, the difference being that erosion requires a transport medium (such as wind, ice, or water), whereas weathering occurs in situ. Geochemical processes are also often described as occurring to material in situ.
In oceanography and ocean sciences, in situ generally refers to observational methods made by obtaining direct samples of the ocean state, such as that obtained by shipboard surveying using a lowered CTD rosette that directly measure ocean salinity, temperature, pressure and other biogeochemical quantities like dissolved oxygen. Historically a reversing thermometer would be used to record the ocean temperature at a particular depth and a Niskin or Nansen bottle used to capture and bring water samples back to the ocean surface for further analysis of the physical, chemical or biological composition.
In the atmospheric sciences, in situ refers to obtained through direct contact with the respective subject, such as a radiosonde measuring a parcel of air or an anemometer measuring wind, as opposed to remote sensing such as weather radar or satellites.
Economics
In economics, in situ is used when referring to the in place storage of a product, usually a natural resource. More generally, it refers to any situation where there is no out-of-pocket cost to store the product so that the only storage cost is the opportunity cost of waiting longer to get your money when the product is eventually sold. Examples of in situ storage would be oil and gas wells, all types of mineral and gem mines, stone quarries, timber that has reached an age where it could be harvested, and agricultural products that do not need a physical storage facility such as hay.
Electrochemistry
In electrochemistry, the phrase in situ refers to performing electrochemical experiments under operating conditions of the electrochemical cell, i.e., under potential control. This is opposed to doing ex situ experiments that are performed under the absence of potential control. Potential control preserves the electrochemical environment essential to maintain the double layer structure intact and the electron transfer reactions occurring at that particular potential in the electrode/electrolyte interphasial region.
Environmental remediation
In situ can refer to where a clean up or remediation of a polluted site is performed using and stimulating the natural processes in the soil, contrary to ex situ where contaminated soil is excavated and cleaned elsewhere, off site.
Experimental physics
Main article: In situ electron microscopyIn transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM), in situ refers to the observation of materials as they are exposed to external stimuli within the microscope, under conditions that mimic their natural environments. This enables real-time observation of material behavior at the nanoscale. External stimuli in in situ TEM/STEM experiments include mechanical loading and pressure, temperature changes, electrical currents (biasing), radiation, and environmental factors—such as exposure to gas, liquid, and magnetic field—or any combination of these. These conditions allow researchers to study atomic-level processes such as phase transformations, chemical reactions, or mechanical deformations, providing insights into material behavior and properties essential for advancements in materials science.
Experimental psychology
In psychology experiments, in situ typically refers to those experiments done in a field setting as opposed to a laboratory setting.
Gastronomy
In gastronomy, "in situ" refers to the art of cooking with the different resources that are available at the site of the event. Here a person is not going to the restaurant, but the restaurant comes to the person's home.
Law
In legal contexts, in situ is often used for its literal meaning. For example, in Hong Kong, in-situ land exchange refers to a mechanism where landowners can swap their existing or expired leases with new grants for the same land parcel. This approach facilitates redevelopment while preserving the property's original location.
In the field of recognition of governments under public international law the term in situ is used to distinguish between an exiled government and a government with effective control over the territory, i.e. the government in situ.
Linguistics
In linguistics, specifically syntax, an element may be said to be in situ if it is pronounced in the position where it is interpreted. For example, questions in languages such as Chinese have in situ wh-elements, with structures comparable to "John bought what?" with what in the same position in the sentence as the grammatical object would be in its affirmative counterpart (for example, "John bought bread"). An example of an English wh-element that is not in situ (see wh-movement): "What did John buy?"
Literature
In literature in situ is used to describe a condition. The Rosetta Stone, for example, was originally erected in a courtyard, for public viewing. Most pictures of the famous stone are not in situ pictures of it erected, as it would have been originally. The stone was uncovered as part of building material, within a wall. Its in situ condition today is that it is erected, vertically, on public display at the British Museum in London, England.
Medicine
The term in situ in the medical context is part of a group of two-word Latin expressions, including in vitro, in vivo, and ex vivo. Similar to abbreviations, these terms support the concise transfer of essential information in medical communication. In situ, specifically, is among the most widely used and versatile Latin terms in medical discourse in modern times.
In oncology, in situ is commonly applied in the context of carcinoma in situ (CIS), a term describing abnormal cells confined to their original location without invasion of surrounding tissue. CIS is a critical term in early cancer diagnosis, as it signifies a non-invasive stage, allowing for more targeted interventions before potential progression. Similarly, melanoma in situ is an early, localized form of melanoma, a type of malignant skin cancer. In this stage, the cancerous melanocytes—the pigment-producing cells that give skin its color—are confined to the epidermis, the outermost layer of the skin. The melanoma has not yet penetrated into the deeper dermal layers of the skin or metastasized to other parts of the body.
Beyond oncology, in situ applies to fields that require maintenance of natural anatomical or physiological positions. In orthopedic surgery, for example, the term describes procedures where orthopedic plates such as bone screws are placed without altering the original alignment of the bone, as in " was treated operatively with an in situ cannulated hip screw fixation".
Mining
Main article: In situ leachIn situ leaching or in situ recovery refers to the mining technique of injecting lixiviant underground to dissolve ore and bringing the pregnant leach solution to surface for extraction. Commonly used in uranium mining but has also been used for copper mining.
Petroleum production
In situ refers to recovery techniques which apply heat or solvents to heavy crude oil or bitumen reservoirs beneath the Earth's crust. There are several varieties of in situ techniques, but the ones which work best in the oil sands use heat (steam).
The most common type of in situ petroleum production is referred to as SAGD (steam-assisted gravity drainage) this is becoming very popular in the Alberta Oil Sands.
RF transmission
In radio frequency (RF) transmission systems, in situ is often used to describe the location of various components while the system is in its standard transmission mode, rather than operation in a test mode. For example, if an in situ wattmeter is used in a commercial broadcast transmission system, the wattmeter can accurately measure power while the station is "on air."
Space science
Main article: In situ resource utilizationFuture space exploration or terraforming may rely on obtaining supplies in situ, such as previous plans to power the Orion space vehicle with fuel minable on the Moon. The Mars Direct mission concept is based primarily on the in situ fuel production using the Sabatier reaction, which produces methane and water from a reaction of hydrogen and carbon dioxide.
In the space sciences, in situ refers to measurements of the particle and field environment that the satellite is embedded in, such as the detection of energetic particles in the solar wind, or magnetic field measurements from a magnetometer.
Urban planning
In urban planning, in-situ upgrading is an approach to and method of upgrading informal settlements.
Vacuum technology
In vacuum technology, in situ baking refers to heating parts of the vacuum system while they are under vacuum in order to drive off volatile substances that may be absorbed or adsorbed on the walls so they cannot cause outgassing.
Road assistance
The term in situ, used as "repair in situ", means to repair a vehicle at the place where it has a breakdown.
See also
- In situ conservation
- Ex situ conservation
- List of colossal sculptures in situ
- List of Latin phrases
- All pages with titles beginning with In situ
Notes
- UK: /ɪn ˈsɪtjuː/ , /ɪn ˈsɪtʃuː/; US: /ˌɪn ˈsaɪtjuː/, /ˌɪn ˈsɪtjuː/; often not italicized in English
References
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