Search results
Results from the WOW.Com Content Network
Facultative intracellular parasites are capable of living and reproducing in or outside of host cells. Obligate intracellular parasites, on the other hand, need a host cell to live and reproduce. Many of these types of cells require specialized host types, and invasion of host cells occurs in different ways.
A facultative parasite is an organism that may resort to parasitic activity, but does not absolutely rely on any host for completion of its life cycle. Examples of facultative parasitism occur among many species of fungi , such as family members of the genus Armillaria .
Unlike facultative intracellular bacteria that can grow within or outside of a host's body, obligate bacteria cannot survive without host cells. These bacteria cannot reproduce outside of the host cell because they lack the metabolic processes and enzymes needed to reproduce, which the host cell gives them. [ 3 ]
The fecal coliform assay is intended to be an indicator of fecal contamination; more specifically of E. coli which is an indicator microorganism for other pathogens that may be present in feces. Presence of fecal coliforms in water may not be directly harmful, and do not necessarily indicate the presence of feces. [1]
On May 6, the White House Office of Science and Technology Policy announced new guidelines for research on dangerous pathogens and toxins, including microorganisms that can cause highly ...
A facultative anaerobic organism is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation if oxygen is absent. [ 1 ] [ 2 ] Some examples of facultatively anaerobic bacteria are Staphylococcus spp. , [ 3 ] Escherichia coli , Salmonella , Listeria spp., [ 4 ] Shewanella oneidensis and ...
Bacterial pathogens also require access to carbon and energy sources for growth. To avoid competition with host cells for glucose which is the main energy source used by human cells, many pathogens including the respiratory pathogen Haemophilus influenzae specialise in using other carbon sources such as lactate that are abundant in the human ...
Salmonella species are facultative intracellular pathogens. [6] Salmonella can invade different cell types, including epithelial cells , M cells , macrophages , and dendritic cells . [ 55 ] As facultative anaerobic organism , Salmonella uses oxygen to make adenosine triphosphate (ATP) in aerobic environments (i.e., when oxygen is available).