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1. Absorbance (optical density)
This is a measure of the amount of light absorbed by a suspension of bacterial cells or a solution of an organic molecule; it is measured by a colorimeter or spectrophotometer . Absorbance values are used to plot the growth of bacteria in suspension culture s and to gauge the purity and concentration of molecules (such as proteins) in solution. Absorbance is defined as a logarithmic function of the percent transmission of a wavelength of light through a liquid.
2. Accessory pigments
Light-absorbing pigments such as carotenoid s and phycobilin s that serve as complements to chlorophyll in plants, algae and bacteria by trapping light energy for photosynthesis .
Acetobacter is a genus of rod-shaped, flagellated or nonmotile Gram-negative bacteria that oxidize ethanol to acetic acid . These bacteria are commonly found on fruits and vegetables, and although they are used commercially to produce vinegar (especially Acetobacter aceti), they're considered pests by brewers and vintners.
4. Acetoclastic bacteria
bacteria that use only acetic acid and produce methane during anaerobic fermentation.
5. Acetogenic bacteria
bacteria that convert carbon dioxide to acetic acid or turn sugars into acetate.
6. Acetyl coA synthase
This enzyme is found in bacteria and plants; it catalyzes the reaction in which acetate enters metabolic pathways and forms acetyl coenzyme A .
7. Acetyl-CoA pathway
A pathway of autotroph ic carbon dioxide fixation commonly happened in obligate anaerobe s such as methanogen s, homoacetogen s, and sulfate reducing bacteria .
This is a skin disease of the face, back and shoulders. It involves overactive sebaceous glands with plugged hair follicles inside which there is growth of an acne bacteria.
Gram-positive bacteria that can form branching filaments. They may form true mycelia or produce conidiospore s.
10. Activated sludge process
A method of treating sewage and wastewater through microbial oxidation. Sewage previously treated in settling tanks is aerated to encourage the growth of nonpathogenic aerobic microorganisms ( bacteria , yeast s, molds and protozoans) which break the organic matter down into carbon dioxide, water, and simple salts. After this activated sludge is produced, the wastewater undergoes further processing through anaerobic digestion, filtering, and chlorination.