MICR 221 Chapter Notes - Chapter 3.0-3.2: Helicobacter Pylori, Lactococcus, Enterococcus
19 Feb 2020
School
Department
Course
Professor
Document Summary
H-pylori can survive in the extreme acidity of the ulcers. Surprisingly, however, h pylori do not love acids. Sooo how exactly do they survive in such a hostile environment??: produce urease: this hydrolyzes urea and produces ammonia. Ammonia neutralizes the acids in the local environment of the cell: find gastric crypts. These are regions in the stomach lining. The bacterium goes deep into the crypts and is bathed in mucus with a less acidic/more basic ph. H-pylori is constantly moving away from regions that are too acidic for its liking -- the constant turnover of gastric mucus ensure h-pylori is always on the move! Only 1 % of bacterial species have been cultured. Of the cultivated species, only a few have been studied much. Bacterial cells = small and relatively simple ; uniform shape & size. Diplococci - when cocci divide and remain together to form pairs. The genera: streptococcus, enterococcus, lactococcus -- demonstrate a similar pattern.
