搜尋結果
4 天前 · Properties. Production. Uses. Reactions. Health and safety. See also. Notes. References. External links. Acetic acid / əˈsiːtɪk /, systematically named ethanoic acid / ˌɛθəˈnoʊɪk /, is an acidic, colourless liquid and organic compound with the chemical formula CH3COOH (also written as CH3CO2H, C2H4O2, or HC2H3O2 ).
3 天前 · CRISPR (/ ˈ k r ɪ s p ər /) (an acronym for clustered regularly interspaced short palindromic repeats) is a family of DNA sequences found in the genomes of prokaryotic organisms such as bacteria and archaea. These sequences are derived from DNA fragments of bacteriophages that had previously infected the prokaryote. ...
2 天前 · Staphylococcus aureus is a gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often positive for catalase and nitrate reduction and is a facultative anaerobe that can grow without the need for oxygen. [1] .
1 天前 · Bacteria (/ b æ k ˈ t ɪər i ə / ; sg.: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell.They constitute a large domain of prokaryotic microorganisms.Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.
3 天前 · Omega−3 fatty acids, also called Omega−3 oils, ω−3 fatty acids, Ω-3 Fatty acids or n−3 fatty acids, [1] are polyunsaturated fatty acids (PUFAs) characterized by the presence of a double bond three atoms away from the terminal methyl group in their chemical structure. [2] They are widely distributed in nature, being important ...
4 天前 · Botulinum toxin, or botulinum neurotoxin (commonly called botox ), is a highly potent neurotoxic protein produced by the bacterium Clostridium botulinum and related species. [23] . It prevents the release of the neurotransmitter acetylcholine from axon endings at the neuromuscular junction, thus causing flaccid paralysis. [24] .
1 天前 · History. Uses. See also. References. External links. Escherichia coli ( / ˌɛʃəˈrɪkiə ˈkoʊlaɪ / ESH-ə-RIK-ee-ə KOH-ly) [1] [2] is a gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms.
