Infectious Exam 1
Terms in this set (23)
bacterial ssu gene
encodes for 16S rRNA
eukaryotic ssu gene
encodes for 18S rRNA
the effective number of species present in a given sample
the number of species that differ in occurrence between two habitats
the capacity and rate at which an ecosystem returns to its original state after a disturbance
raised in germ free environments without exposure to microbes. colonized with specific microbial communities.
the max degree a system can be shifted by a perturbation before it loses its property to recover back to its initial stable state
distance from the initial homeostatic state to a threshold of no return
the influence an organizational state of a population has on its ability to cope with stress
measures the property of a community to remain unchanged
when microbiota contributes to the manifestation of a disease
an external event that disturbs the community for a shorter amount of time (antibiotics)
an external event that disturbs the community for a longer amount of time
fecal microbiota transplant. used to treat c. difficile. community returns to normal state of the donor.
decreased acid secretion which leads to a more basic stomach pH than normal
Presence of an excess of gastrin in stomach fluids. gastrin signals for acid secretion
Enzyme that changes urea into ammonia and creates a neutral pH by withdrawing protons. allows h.pylori to survive in stomach acid.
helps h.pylori move to the mucus, where there is a pH gradient
spirochete. allows h.pylori to move through the mucus
BabA and SabA
allows the h.pylori to adhere to the epithelial cells by binding to lewis and lewis like blood group antigens on the surface.
VacA and CagA
allows h.pylori to get metabolites by disrupting the apical and basal layers of the epithelial cells, and VacA localizes transferrin (iron transport protein) to enhance iron uptake.
destroys epithelial cells by inserting DNA and peptidoglycan, which leads to an immune response
interferes with H+/K+ pumps
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