Section Z

Zone of inhibition: The area of no bacterial growth around an antimicrobial agent in the disk-diffusion test.

Zooflagellates: Flagellate protozoa that do not have chlorophyll and are either holozoic, saprozoic, or symbiotic.

Zoogleal mass: Jellylike matrix in which microorganisms may be embedded.

Zoonosis (pl. zoonoses): A disease primarily occurs in wild and domestic animals which can be transmitted to humans. (e.g., tularemia).

Zoophilic: Fungi that grow preferentially on animals.

Zoospore: A motile asexual spore.

Zooxanthella: A symbiotic dinoflagellate found living symbiotically within cnidarians and other invertebrates.

Zygomycetes: Group of fungi with nonseptate hyphae and spores produced within a sporangium.

Zygospore: A thick-walled sexual spore formed by the fusion of two gametangia in the Zygomycetes. Example: Rhizopus.

Zygote: The cell resulting from the fusion of male and female gametes; occurs in the mosquito stomach (Plasmodium spp.).

Zymogenous: Fermentation production. In environmental microbiology, the term refers to microorganisms, often transient or alien, that respond rapidly by enzyme production and growth when simple organic substrates become available.

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