Zonation The distribution of organisms in zones; specifically, a stratification of certain kinds of algae at certain depths and locations in the ocean.Zooflagellate An animallike form of fla… Read More
Yeast A kind of fungus that is unicellular and lacks typical mycelia.Yolk sac The membrane covering the yolk of an egg Read More
X factor Heme; required for the growth of certain Haemophilus Read More
Warburg respirometer An apparatus used to study enzyme reactions in which an exchange of gases takes place.Wassermann antibodies Antibodies against cardiolipin, such as occur in syphilitic p… Read More
Vaccination Inoculation with a biologic preparation (a vaccine) to produce immunity.Vaccine A preparation of killed or attenuated microorganisms, or their components, or their products, that… Read More
Ultracentrifuge A high-speed centrifuge used for the determination of the particle size of viruses and proteins.Ultrafiltration A method for the removal of all but the very smallest particle… Read More
Taxis The movement away from or toward a chemical or physical stimulus.Taxon, pl.taxa A taxonomic group, such as species, genus, or family.Taxonomy The classification (arrangement), nomencla… Read More
Saccharolytic Capable of splitting sugar compounds.Salmonellosis An infection by Salmonella spp. that effects the gastrointestinal tract.Sanitizer An agent that reduces to levels judged safe… Read More
Rabies An acute disease of humans and other animals, caused by a virus. It is transmitted from infected animals to humans through bites.Radioisotope An isotope that exhibits radioactivity.RD… Read More
Quellung reaction The increase in the visibility of a bacterial capsule that results from the reaction between the capsular antigens and specific anticapsular serum Read More
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