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A collodion bag is a membrane used to filter or concentrate substances, often proteins, using pressure. It usually takes the form of a small finger shaped receptacle hooked up to a positive pressure pump. The bag has a characteristic that allows small particles, like water or unbound ions, to flow out while retaining larger particles in the bag.
References
Further reading
- Modern Techniques in Cytopathology
- Can't Live Without it: The Story of Hemoglobin in Sickness and in Health
- Colloidion bag - Google Search
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