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The HACEK organisms are a group of fastidious Gram-negative bacteria that are an unusual cause of infective endocarditis, which is an inflammation of the heart due to bacterial infection. [1] HACEK is an abbreviation of the initials of the genera of this group of bacteria: Haemophilus , Aggregatibacter (previously Actinobacillus ...
Gram-negative bacteria with a rod morphology were isolated from the tissue after 48 hours. [3] Cardiobacterium hominis was later identified using mass spectroscopy . Incidentally, the bacteria was later characterized to be another species in the genus Cardiobacterium , because it was found in cardiac tissue and found to be a cause of infective ...
Many species are pleomorphic, meaning they can alter their biological function, morphology, or mode of reproduction in response to environmental conditions. All bacteria in the Cytophagales are chemoorganotrophs and many of them are able to degrade complex biomacromolecules such as proteins, chitin, pectin, agar, starch, or cellulose.
Xochitecatl [ʃot͡ʃiˈtekat͡ɬ] is a pre-Columbian archaeological site located in the Mexican State of Tlaxcala, 18 km southwest of Tlaxcala city. [1] The major architecture dates to the Middle Preclassic Period (1000–400 BC) but occupation continued, with one major interruption, until the Late Classic , when the site was abandoned.
Type IV secretion system (T4SS or TFSS) is related to bacterial conjugation system, by which different bacteria can exchange their DNAs. The participating bacteria can be of the same or different Gram-negative bacterial species. It can transport single proteins, as well as protein-protein and DNA-protein complexes.
Organic matter produced by autotrophic bacteria is then used to support the upper trophic levels. The hydrothermal vent fluid and the surrounding ocean water is rich in elements such as iron , manganese and various species of sulfur including sulfide , sulfite , sulfate , elemental sulfur from which they can derive energy or nutrients. [ 9 ]
Another protective function throughout the cardiovascular system is its ability to affect the filtration of interstitial fluid from capillaries into the interstitial space. [7] The glycocalyx, which is located on the apical surface of endothelial cells, is composed of a negatively charged network of proteoglycans, glycoproteins, and glycolipids ...
This regulator protein subsequently functions as a transcription factor and alters gene expression. Similar to Gram-negative bacteria, the autoinduction and quorum sensing system in Gram-positive bacteria is conserved, but again, individual species have tailored specific aspects for surviving and communicating in unique niche environments.