रक्त सीरम में एक एंटीबॉडी जो सूक्ष्मजीवों और अन्य एंटीजनों पर हमला करने के लिए जुड़ा हुआ है ताकि उन्हें फागोसाइट्स की कार्रवाई के लिए अधिक संवेदनशील बना सकें

opsonin's Usage Examples:

This opsonin of normal serum is very labile, being rapidly destroyed at 55° C.; that is, a serum heated at this temperature has practically no greater effect in aiding phagocytosis than normal salt solution has.

Wright and others, in recent work on opsonins, have shown that, by injecting dead cultures of the causal agent into subjects infected with the organism, there is produced in the body fluids a substance (opsonin) which apparently in favourable conditions unites with the living causal bacteria and so sensitizes them that they are readily taken up and destroyed by the phagocytic cells of tissues.

In the light of all the facts, however, especially those contains an opsonin which leads to phagocytosis of the bacillus, and the latter is then destroyed by the leucocytes.

This opsonin of normal serum is very labile, being rapidly destroyed at 55° C.; that is, a serum heated at this temperature has practically no greater effect in aiding phagocytosis than normal salt solution has.

opsonin's Meaning':

an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes