The microorganisms depending upon their needs to grow in their natural homes or ecological niche may be grouped into the following broad categories keeping in view their requirement for oxygen, source of energy (carbon) and temperature. (A) On basis of their oxygen requirement they are grouped as: (i) Aerobes or aerobic microorganisms which have capability to grow on media or [...]
Some of the important groups that represent bacterial diversity are as follows:- (1) Spirochetes (e.g., Treponema pallidum and Borrelia recurrentis) (2) Aerobic/microaerophilic, motile, helical/vibroid gram negative bacteria (e.g., Spirillum volutans, Aquaspirillum Bengal, Campylobacter, Helicobacter pylori, Bdellovibrio bacteriovorus) (3) Non-motile or rarely motile Gram negative curved bacteria (e.g., Cyclobacterium, Ancyclobacter and Brachyarchus) (4) Gram negative aerobic/microaerophilic rods and cocci (e.g., Pseudomonas, [...]
The below mentioned article provides a note on methanogenesis. Methane producing prokaryotes are a group of archaea which are capable of reducing carbon dioxide or low molecular weight fatty acids to produce methane. The methanogens are strictly anaerobic active at redox potential between - 350 and - 450 mv. They can use CO2 as an electron acceptor. They reduce CO2 [...]