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Bacteria can be aerobes or anaerobes. Depending on the degree of oxygen required bacteria can fall into the following classes: facultative-anaerobes-ie aerotolerant absence or minimal oxygen required for their growth; obligate-anaerobes grow only in complete absence of oxygen; facultative aerobes-can grow either in presence or minimal oxygen
FAT TOM is a mnemonic device used in the food service industry to describe the six favorable conditions required for the growth of foodborne pathogens. It is an acronym for food, acidity, time, temperature, oxygen and moisture. [1]
When gram positive bacteria, such as Bacillus species, receives diffusible signal factor from gram positive bacteria this can stop the endospore vegetation transition and cause the bacteria to die. Shared diffusible signal factor can also cause other species to become susceptible to antibiotics. [6] DSFs are a cis-unsaturated fatty acid.
Most commonly apparent in species that reproduce quickly and asexually, like bacteria, exponential growth is intuitive from the fact that each organism can divide and produce two copies of itself. Each descendent bacterium can itself divide, again doubling the population size (as displayed in the above graph). [ 2 ]
In microbiology, a colony-forming unit (CFU, cfu or Cfu) is a unit which estimates the number of microbial cells (bacteria, fungi, viruses etc.) in a sample that are viable, able to multiply via binary fission under the controlled conditions. Counting with colony-forming units requires culturing the microbes and counts only viable cells, in ...
Certain bacteria form close spatial associations that are essential for their survival. One such mutualistic association, called interspecies hydrogen transfer, occurs between clusters of anaerobic bacteria that consume organic acids, such as butyric acid or propionic acid, and produce hydrogen, and methanogenic archaea that consume hydrogen. [210]
A microbiological culture, or microbial culture, is a method of multiplying microbial organisms by letting them reproduce in predetermined culture medium under controlled laboratory conditions. Microbial cultures are foundational and basic diagnostic methods used as research tools in molecular biology .
Some species form extraordinarily resilient spores, but for bacteria this is a mechanism for survival, not reproduction. Under optimal conditions bacteria can grow extremely rapidly and their numbers can double as quickly as every 20 minutes. [57]