1. an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
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How To Use opsonin In A Sentence

  • Complement molecules can function as opsonins in the recognition of bacterial pathogens and in their elimination by phagocytosis of the bound complexes.
  • The three most important of the antibodies referred to which can be demonstrated with a certain amount of facility are agglutinin, opsonin and bacteriolysin; and the methods of testing for these bodies will now be considered. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.
  • I call opsonin, goes on in the system by ups and downs -- Nature being always rhythmical, you know -- and that what the inoculation does is to stimulate the ups or downs, as the case may be. The Doctor's Dilemma
  • A mixture of opsonins adhere to the bacterium and facilitate ingestion by alveolar macrophages.
  • In the case of the latter animal the serum [v. 03 p. 0180] contains an opsonin which leads to phagocytosis of the bacillus, and the latter is then destroyed by the leucocytes. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
  • Wright, who has been largely responsible for developing this argument, insists on the subordinate role of the white corpuscles that follow blindly the opsonin lead. Ilya Mechnikov - Nobel Lecture
  • To inject a vaccine into a patient without first testing his opsonin is as near murder as a respectable practitioner can get. The Doctor's Dilemma
  • This, as already pointed out, depends upon the increase of opsonins, though it is also to be noted that in many infective conditions there is another factor present, namely a leucocytosis, that is, an increase of the leucocytes in the blood, and the defensive powers of the body are thereby increased. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
  • The "opsonin," or "relish," is something exuded into or produced in the blood fluid when the attacking microbe arrives. More Science From an Easy Chair
  • In the investigations on the opsonins and bacteriotropins, investigations guided by humoral notions, on the whole only the power of the blood fluid to favour phagocytosis is regarded. Ilya Mechnikov - Nobel Lecture
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