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Bacteria

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Acetobacter

Acetobacter  

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(family Acetobacteraceae)A genus of Gram-negative, aerobic bacteria. Cells are ovoid or rod-shaped, motile or non-motile. Most strains can oxidize ethanol (ethyl alcohol) to carbon dioxide, forming ...
acid-fast bacteria

acid-fast bacteria  

Certain bacteria of the order Actinomycetales, including Mycobacterium species, which, after being treated with certain dyes, are not decolorized on subsequent treatment with a mineral acid.
Actinobacteria

Actinobacteria  

A phylum of Gram-positive mostly anaerobic nonmotile bacteria. Many species are fungus-like, with filamentous cells producing reproductive spores on aerial branches similar to the spores of certain ...
aerogenic

aerogenic  

Applied to Bacteria that can produce gas during the metabolism of certain types of substrate.
agar

agar  

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n. an extract of certain seaweeds that forms a gel suitable for the solidification of liquid bacteriological culture media. Blood agar is nutrient agar containing 5–10% horse blood, used for the ...
Agrobacterium

Agrobacterium  

(family Rhizobiaceae)A genus of bacteria most of which are capable of causing the formation of galls in plants. No species can fix atmospheric nitrogen. A. tumefaciens causes crown gall in many types ...
amoeba

amoeba  

Any single-celled eukaryote that is naked and changes shape due to the irregular extension and retraction of pseudopodia.
Anaplasmataceae

Anaplasmataceae  

(order Rickettsiales)A family of bacteria in which the cells are very small and obligately parasitic (see parasitism) in the blood of vertebrates. They are transmitted from one host to another by ...
Ancalomicrobium

Ancalomicrobium  

A genus of Gram-negative bacteria not assigned to any taxonomic family. The cells are variable in shape, according to conditions, but typically have 2–8 stalk-like extensions. Reproduction is by ...
antibiotic

antibiotic  

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(anti-by-ot-ik)a substance, produced by or derived from a microorganism, that destroys or inhibits the growth of other microorganisms. Antibiotics are used to treat infections caused by organisms ...
antibiotic resistance

antibiotic resistance  

The acquisition of unresponsiveness to a specific antibiotic by a microorganism that was previously adversely affected by the drug. Such resistance generally results from a mutation or the ...
antibody

antibody  

A protein (see immunoglobulin) produced by certain white blood cells (plasma cells) in response to entry into the body of a foreign substance (antigen) in order to render it harmless. An ...
anus

anus  

n. the opening at the lower end of the alimentary canal, through which the faeces are discharged. It opens out from the anal canal and is guarded by two sphincters. The anus is closed except during ...
apocrine gland

apocrine gland  

A type of gland in which the apical part, from which the secretion is released, breaks down during the secretion process. The gland opens at the surface of the skin near, but not within, hair ...
archaea

archaea  

The domain comprising what were formerly known as the archaebacteria. What used to be the kingdom Archaebacteria has been split into two kingdoms: Crenarchaeota and Euryarchaeota. The domain Archaea ...
Arthrobacter

Arthrobacter  

(order Actinobacteria)A genus of bacteria. The cells undergo a change in form during culture in the laboratory, from roughly spherical to irregularly rod-shaped. They are chemo-organotrophic, and can ...
Asticcacaulis

Asticcacaulis  

A genus of Gram-negative bacteria which is not assigned to any taxonomic family. It is similar to Caulobacter in its life cycle, but differs in that the stalk occurs eccentrically at one pole or on ...
Azotobacter

Azotobacter  

(family Azotobacteraceae)A genus of bacteria characterized by the production of differentiated resting cells called cysts. Vegetative cells are typically ovoid in shape and can carry out nitrogen ...
bacillus

bacillus  

Any rod-shaped bacterium. Generally, bacilli are large, Gram-positive, spore-bearing, and have a tendency to form chains and produce a capsule. Some are motile, bearing flagella. They are ubiquitous ...
bactericidal

bactericidal  

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adj. being capable of killing bacteria. Substances with this property include antibiotics, antiseptics, and disinfectants; they are known as bactericides. Compare bacteriostatic.

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