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anaerobic bacteriaBacteria which grow without O2, either by metabolic necessity (obligate anaerobes) or by preference (facultative anaerobes). Anaerobes are the primary pathogens of wound infections. Specimens obtained from patients in whom an anaerobic infection is suspected require special handling, as O2 (i.e., open air) is toxic to cultures and they may present as “culture-negative” if exposed; once the specimen arrives in the lab, it is processed under conditions of decreased O2, and any bacteria identified are recultured to determine their sensitivity to antibiotics.
Bacteria that do not require oxgyen, found in low concentrations in the normal vagina
an·aer·ob·ic bac·te·ri·a(anār-ōbik bak-tērē-ă)
Bacteria that can live and grow in the absence of oxygen. Some anaerobic bacteria are inhibited or killed by oxygen.
the absence of air.
anaerobic effluent treatment
is usually conducted in deep ponds where air does not penetrate. A fully contained system is also available.
exercise at high work intensity during which the needs of muscle metabolism for oxygen exceeds the capacity of the circulation to supply it and an oxygen debt is incurred.
one caused by aerobic organisms.
plural of bacterium.
derive energy from fermentative processes in the absence of oxygen. Are found in necrotic or abscessed tissues.
cell-wall deficient bacteria
see L-form bacteria (below).
facultatively anaerobic bacteria
are able to derive energy from aerobic or anaerobic metabolism. Includes most intestinal pathogens.
glucose-non-fermenting, gram-negative bacteria
includes Bordetella, Moraxella and Pseudomonas species.
abnormal growth forms that can replicate in the form of small filterable elements with defective or absent cell walls. Spontaneously formed by some bacteria, e.g. Streptococcus spp., Bacterioides spp., and by others when synthesis is impaired. L-forms have been associated with infections in dogs and cats.
those added to provide a means of identifying the bacteria being studied. See serratiarubidaea.
obligate aerobic bacteria
require oxygen as a source of energy and therefore for growth.
see antimicrobial resistance.
the ruminal fluid of the normal cow contains 10 to 50 million million organisms per gram. Bacteria outnumber the protozoan population many times over. The genera and species of bacteria present vary between times in the same cow. The function of the ruminal bacteria is to digest the food taken in and thus allow its absorption. This includes the lysis of cellulose, xylanol, starch, dextrin, pectin, protein, lipids, the utilization of glycerol and lactate, and the fermentation of soluble sugars. The end products of the digestive process include methane, formate, acetate, ethanol, propionate, lactate, butyrate, succinate, valerate, caproate, hydrogen and carbon dioxide.