Search results
Results From The WOW.Com Content Network
An endospore is a dormant, tough, and non-reproductive structure produced by some bacteria in the phylum Bacillota. [ 1 ] [ 2 ] The name "endospore" is suggestive of a spore or seed-like form ( endo means 'within'), but it is not a true spore (i.e., not an offspring).
It has been proposed that endospore formation has allowed for the survival of some bacteria for hundreds of millions of years (e.g. in salt crystals) [14] [15] although these publications have been questioned. [16] [17] Endospore formation is limited to several genera of gram-positive bacteria such as Bacillus and Clostridium. It differs from ...
Endospore staining is a technique used in bacteriology to identify the presence of endospores in a bacterial sample. [1] Within bacteria, endospores are protective structures used to survive extreme conditions, including high temperatures making them highly resistant to chemicals. [ 2 ]
Bacillus species are rod-shaped, endospore-forming aerobic or facultatively anaerobic, Gram-positive bacteria; in some species cultures may turn Gram-negative with age. The many species of the genus exhibit a wide range of physiologic abilities that allow them to live in every natural environment. Only one endospore is formed per cell.
B. subtilis can divide symmetrically to make two daughter cells (binary fission), or asymmetrically, producing a single endospore that is resistant to environmental factors such as heat, desiccation, radiation and chemical insult which can persist in the environment for long periods of time. The endospore is formed at times of nutritional ...
The function of tetanolysin is unclear, although it may help C. tetani to establish infection within a wound. [6] [1] Tetanospasmin ("tetanus toxin") is a potent toxin with an estimated lethal dose less than 2.5 nanograms per kilogram of body weight, and is responsible for the symptoms of tetanus.
Bacillus submarinus is a gram positive, aerobic meaning that it requires oxygen for metabolism.B. submarinus is a sporulating bacteria which is when the cell puts it genetic information in a spore during a cell's dormant phase, rod-shaped, bacterium of the genus Bacillus that is commonly found in the ocean at extreme depths and pressures. [2]
The Mycobacteria (acid-fast bacteria) have a cell envelope which is not typical of Gram-positives or Gram-negatives. The mycobacterial cell envelope does not consist of the outer membrane characteristic of Gram-negatives, but has a significant peptidoglycan-arabinogalactan-mycolic acid wall structure which provides an external permeability barrier.