Bacteria with unusual properties - Phase 2

Sunday, 7 March 2010 0 comments
The organisms are anaerobic and do not evolve O2 during photosynthesis. Oxygenic phototrophic bacteria which contain chlorophyll can use light as an energy source and evolve O2 in a manner similar to that of green plants. The group includes the cyanobacteria. A Chemolithotrophis bacterium is gram negative non phototrophic bacteria that obtain energy for carbon dioxide fixation from the oxidation of ammonia, nitrate, reduced sulfur compounds or ferrous iron. Archacobacteria is a gram positive or gram negative bacteria that are4 phylogenetically distinct from eubacteria. Some produce methane gas, some require unusually high levels of NaCl for growth, other are distinguished by their ability to grow at a low PH and a high temperature.

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Bacteria with unusual properties - Phase 1

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The unusual type of organisms are phototrophic which is able to use light as an energy source others are chemolithotrophicare able to obtain energy by oxidizing inorganic compounds such as ammonia, nitrate, hydrogen sulfide or ferrous iron. Still others are not distinguished by an unusual metabolism but rather by other features such as the occurrence of gliding motility rather than motility by the action of flagella reproduction by budding rather than by binary fission or special morphological structures such as sheaths, prosthecae and stalks. Anoxygenic phototrophic bacteria have the major characteristic of gram negative bacteria that contain bacteriochlorophyll and can use light as an energy source.

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Tuesday, 2 March 2010 0 comments
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ordinary Gram-Positive Bacteria - part 2

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Mycobacteria are an Aerobic, slightly curved or straight rods which sometimes show branching and stain acid fast. Nocardio forms of aerobic organisms that tend to form a substrate mycelcum and sometimes an aerial mycerium. The hyphae fragment into rod shaped or coccoid elements. Conidiospores may develop from the aerial hyphae. Most have a simple morphology and none form prosthecae, sheaths or cysts. Some genera form heat-resistant endospores. Although most of the organisms have a regualar, uniform shape and some are pleomorphic. Most of the organisms occur singly in pairs or in chains but some are arranged in trichomes and other form branching hyphae.