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acrotelm

acrotelm  

The upper layer of a peat bog, in which organic matter decomposes aerobically and much more rapidly than in the underlying, anaerobic catotelm. As litter accumulates at the surface the size of the ...
Actinomyces

Actinomyces  

(ak-ti-noh-my-seez)a genus of Gram-positive nonmotile fungus-like bacteria that cause disease in animals and humans. A. israelii the causative organism of human actinomycosis.
aerobic

aerobic  

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adj. 1. of or relating to aerobes: requiring free oxygen for life and growth. 2. describing a type of cellular respiration in which foodstuffs (carbohydrates) are completely oxidized by atmospheric ...
aerobic respiration

aerobic respiration  

A type of cellular respiration in which foodstuffs (carbohydrates) are completely oxidized by atmospheric oxygen, with the production of maximum chemical energy from the foodstuffs.
aerotolerant

aerotolerant  

Applied to organisms (usually bacteria) that, although normally anaerobic, are not killed by the presence of air.
altitude

altitude  

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Height above sea level or ground level. Also known as elevation.
anaerobic biological treatment

anaerobic biological treatment  

A process commonly used in the treatment of municipal waste that uses anaerobic organisms (without air) to reduce the organic matter in wastes. Also known as anaerobic digestion.
anaerobic decomposition

anaerobic decomposition  

The breakdown of organic matter caused by anaerobicmicro‐organisms in an oxygen‐free environment.
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 ...
anoxic

anoxic  

Lacking or not involving or requiring oxygen. For example, a culture of anaerobic microorganisms is called an anoxic culture.
Archaebacteria

Archaebacteria  

A subkingdom of the Prokaryotae (See Classification). The archaebacteria are placed in a group separate from the rest of the bacteria (the eubacteria) on the basis of a variety of biochemical ...
Bacteria

Bacteria  

One of three superkingdoms (domains) of cellular organisms, the others being Archaea and Eukarya. Bacteria are unicellular and anucleate i.e. prokaryotes. They embrace a great diversity of forms, ...
bacteria

bacteria  

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Unicellular or threadlike micro-organisms that reproduce by fission (2) and are often parasitic and liable to cause diseases. bacterial adj. bacterium sing. [From Greek bakterion a little rod, ...
bacteriochlorophyll

bacteriochlorophyll  

A form of chlorophyll found in photosynthetic bacteria, notably the purple and green bacteria. There are several types, designated a to g. For example, bacteriochlorophyll a and bacteriochlorophyll b ...
Bifidobacteria

Bifidobacteria  

A genus of Gram-positive bacteria in which the cells are pleomorphic and often Y- or V-shaped. They are anaerobic, fermenting glucose to produce acetic acid and lactic acid. They are found in the gut ...
biogas

biogas  

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A mixture of methane and carbon dioxide that is generated by the anaerobic fermentation of organic matter such as plant residues and animal manure, and can be used as a renewable fuel or a fertilizer.
biotic indices

biotic indices  

Indicator species, when used as a guide to the level of a particular abiotic factor. For example, the presence of certain invertebrate groups in fresh water can be awarded a score that indicates the ...
Borrelia

Borrelia  

n. a genus of large parasitic spirochaete bacteria. Various species, transmitted by lice or ticks, cause relapsing fever; the species B. burgdorferi, transmitted by ticks, causes Lyme disease.
carbon monoxide

carbon monoxide  

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A colourless almost odourless gas that is very poisonous. When breathed in it combines with haemoglobin in the red blood cells to form carboxyhaemoglobin, which is bright red in colour. This compound ...
cellular respiration

cellular respiration  

The process by which a cell breaks down organic compounds (such as sugar) in order to release the energy it needs to perform work. This process may be aerobic or anaerobic, depending on the ...

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