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Raoultella Planticola MacConkey Colonies 32
The genus ''Raoultella'' is composed of Gram-negative, oxidase-negative, aerobic, nonmotile, capsulated, facultatively anaerobic rods (formerly designated '' Klebsiella'') in the family Enterobacteriaceae. It is named after the French bacteriologist Didier Raoult... The existence of this genus renders the genus '' Klebsiella'' paraphyletic, and it has been repeatedly proposed to consider ''Raoultella'' a junior synonym of ''Klebsiella''. Description Members of genus ''Raoultella'' grow at 10 °C consistent with their recovery from plants, soil, and water, whereas members of ''Klebsiella'' do not grow at 10 °C and are mainly recovered from mammals' mucosae. '' Klebsiella oxytoca'' is an exception, and a proposal to classify ''K. oxytoca'' in a separate, unnamed genus has been made. It consists of species ''Raoultella electrica'', ''Raoultella ornithinolytica'', ''Raoultella planticola'' and ''Raoultella terrigena''. In human infections, Raoultella sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raoultella Planticola
''Raoultella planticola'' is a Gram-negative bacterium of the genus '' Raoultella''. ''R. planticola'' is quite similar in appearance to ''Klebsiella pneumoniae'' and must be identified based on growth habits or DNA analysis. A number of strains have been identified. ''R. planticola'' has been determined to have complicated at least one case of severe pancreatitis. Strains A strain of ''Raoultella planticola'', Cd-1 has been found which grows anaerobically at high aqueous cadmium concentrations and precipitates insoluble cadmium sulfide. This strain has been isolated from reducing salt marsh sediments and may be useful in bioremediation of cadmium from exposed soils. Taxonomic reclassification ''Raoultella planticola'' was formerly classified as part of the genus ''Klebsiella''. It was reclassified along with several other ''Klebsiella'' species in 2001. Genetic modification In the late 1980s ''R. planticola'' was genetically modified by inserting a plasmid from '' Zymomo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motility
Motility is the ability of an organism to move independently, using metabolic energy. Definitions Motility, the ability of an organism to move independently, using metabolic energy, can be contrasted with sessility, the state of organisms that do not possess a means of self-locomotion and are normally immobile. Motility differs from mobility, the ability of an object to be moved. The term vagility encompasses both motility and mobility; sessile organisms including plants and fungi often have vagile parts such as fruits, seeds, or spores which may be dispersed by other agents such as wind, water, or other organisms. Motility is genetically determined, but may be affected by environmental factors such as toxins. The nervous system and musculoskeletal system provide the majority of mammalian motility. In addition to animal locomotion, most animals are motile, though some are vagile, described as having passive locomotion. Many bacteria and other microorganisms, and multice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta-lactamase
Beta-lactamases, (β-lactamases) are enzymes () produced by bacteria that provide multi-resistance to beta-lactam antibiotics such as penicillins, cephalosporins, cephamycins, monobactams and carbapenems ( ertapenem), although carbapenems are relatively resistant to beta-lactamase. Beta-lactamase provides antibiotic resistance by breaking the antibiotics' structure. These antibiotics all have a common element in their molecular structure: a four-atom ring known as a beta-lactam (β-lactam) ring. Through hydrolysis, the enzyme lactamase breaks the β-lactam ring open, deactivating the molecule's antibacterial properties. Beta-lactam antibiotics are typically used to target a broad spectrum of gram-positive and gram-negative bacteria. Beta-lactamases produced by gram-negative bacteria are usually secreted, especially when antibiotics are present in the environment. Structure The structure of a ''Streptomyces'' serine β-lactamase (SBLs) is given by . The alpha-beta f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbapenem
Carbapenems are a class of very effective antibiotic agents most commonly used for the treatment of severe bacterial infections. This class of antibiotics is usually reserved for known or suspected multidrug-resistant (MDR) bacterial infections. Similar to penicillins and cephalosporins, carbapenems are members of the beta lactam class of antibiotics, which kill bacteria by binding to penicillin-binding proteins, thus inhibiting bacterial cell wall synthesis. However, these agents individually exhibit a broader spectrum of activity compared to most cephalosporins and penicillins. Furthermore, carbapenems are typically unaffected by emerging antibiotic resistance, even to other beta-lactams. Carbapenem antibiotics were originally developed at Merck & Co. from the carbapenem thienamycin, a naturally derived product of ''Streptomyces cattleya''. Concern has arisen in recent years over increasing rates of resistance to carbapenems, as there are few therapeutic options for treatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klebsiella Oxytoca
''Klebsiella oxytoca'' is a Gram-negative, rod-shaped bacterium that is closely related to '' K. pneumoniae'', from which it is distinguished by being indole-positive; it also has slightly different growth characteristics in that it is able to grow on melezitose, but not 3-hydroxybutyrate. It was first described in 1886 when it was isolated from sour milk and named ''Bacillus oxytocus perniciosus'' (from Greek ''oxus'' 'sour' + ''-tokos'' 'producing'). ''Klebsiella oxytoca'' is characterized by negative methyl red, positive VP, positive citrate, urea and TSI gas production, is AA, and negative for TSI sulfide, DNAse, growth on sulfide-indole motility medium and the phenylalanine deaminase test. It is a diazotroph, able to colonise plant hosts and fix atmospheric nitrogen into a form which the plant can use. Association of ''K. oxytoca'' with the barley rhizosphere during an entire vegetative period has been demonstrated. The bacteria adhere strongly to root hairs, and less st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raoultella Planticola MacConkey Colonies 32
The genus ''Raoultella'' is composed of Gram-negative, oxidase-negative, aerobic, nonmotile, capsulated, facultatively anaerobic rods (formerly designated '' Klebsiella'') in the family Enterobacteriaceae. It is named after the French bacteriologist Didier Raoult... The existence of this genus renders the genus '' Klebsiella'' paraphyletic, and it has been repeatedly proposed to consider ''Raoultella'' a junior synonym of ''Klebsiella''. Description Members of genus ''Raoultella'' grow at 10 °C consistent with their recovery from plants, soil, and water, whereas members of ''Klebsiella'' do not grow at 10 °C and are mainly recovered from mammals' mucosae. '' Klebsiella oxytoca'' is an exception, and a proposal to classify ''K. oxytoca'' in a separate, unnamed genus has been made. It consists of species ''Raoultella electrica'', ''Raoultella ornithinolytica'', ''Raoultella planticola'' and ''Raoultella terrigena''. In human infections, Raoultella sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Encyclopedia Of Life
The ''Encyclopedia of Life'' (''EOL'') is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It is compiled from existing trusted databases curated by experts and with the assistance of non-experts throughout the world. It aims to build one "infinitely expandable" page for each species, including video, sound, images, graphics, as well as text. In addition, the Encyclopedia incorporates content from the Biodiversity Heritage Library, which digitizes millions of pages of printed literature from the world's major natural history libraries. The project was initially backed by a US$50 million funding commitment, led by the MacArthur Foundation and the Sloan Foundation, who provided US$20 million and US$5 million, respectively. The additional US$25 million came from five cornerstone institutions—the Field Museum, Harvard University, the Marine Biological Laboratory, the Missouri Botanical Garden, and the Smithsonian Ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prokaryotic Names With Standing In Nomenclature
List of Prokaryotic names with Standing in Nomenclature (LPSN) is an online database that maintains information on the naming and taxonomy Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ... of prokaryotes, following the taxonomy requirements and rulings of the International Code of Nomenclature of Prokaryotes. The database was curated from 1997 to June 2013 by Jean P. Euzéby. From July 2013 to January 2020, LPSN was curated by Aidan C. Parte. In February 2020, a new version of LPSN was published as a service of the Leibniz Institute DSMZ, thereby also integrating the Prokaryotic Nomenclature Up-to-date service. References External links List of Prokaryotic names with Standing in Nomenclature [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Didier Raoult
Didier Raoult (; born 13 March 1952) is a retired French physician and microbiologist specialising in infectious diseases. He taught about infectious diseases at the Faculty of Medicine of Aix-Marseille University (AMU), and in 1984, created the ''Rickettsia'' Unit of the university. From 2008 to 2022, Raoult was the director of the ''Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes''. He gained significant worldwide attention during the COVID-19 pandemic for vocally promoting hydroxychloroquine as a treatment for the disease, despite the lack of evidence for its effectiveness and the subsequent opposition from NIH and WHO to its use for the treatment of COVID-19 in hospitalized patients. Personal life Raoult was born on 13 March 1952 in Dakar, French West Africa (present-day Senegal). Raoult's father, who came from Brittany, was serving there as a military doctor; his mother, originally from Marseille, was a nurse. His family returned to France in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klebsiella
''Klebsiella'' is a genus of Gram-negative, oxidase-negative, rod-shaped bacteria with a prominent polysaccharide-based capsule. ''Klebsiella'' species are found everywhere in nature. This is thought to be due to distinct sublineages developing specific niche adaptations, with associated biochemical adaptations which make them better suited to a particular environment. They can be found in water, soil, plants, insects and other animals including humans. ''Klebsiella'' is named after German-Swiss microbiologist Edwin Klebs (1834–1913). Carl Friedlander described ''Klebsiella'' bacillus which is why it was termed Friedlander bacillus for many years. The members of the genus ''Klebsiella'' are a part of the human and animal's normal flora in the nose, mouth and intestines. The species of ''Klebsiella'' are all gram-negative and usually non-motile. They tend to be shorter and thicker when compared to others in the family Enterobacteriaceae. The cells are rods in shape and gener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Facultative Anaerobic Organism
A facultative anaerobic organism is an organism that makes Adenosine triphosphate, ATP by aerobic respiration if oxygen is present, but is capable of switching to Fermentation (biochemistry), fermentation if oxygen is absent. Some examples of facultatively anaerobic bacteria are ''Staphylococcus'' Species, spp., ''Escherichia coli'', ''Salmonella'', ''Listeria'' spp., ''Shewanella oneidensis'' and ''Yersinia pestis''. Certain eukaryotes are also facultative anaerobes, including fungi such as ''Saccharomyces cerevisiae'' and many aquatic invertebrates such as Nereid (worm), nereid polychaetes. See also * Aerobic respiration * Anaerobic respiration * Fermentation * Obligate aerobe * Obligate anaerobe * Microaerophile References External links Facultative Anaerobic Bacteria {{Bacteria Anaerobic respiration Cellular respiration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capsule (microbiology)
The bacteria capsule is a large structure common to many bacteria. It is a polysaccharide layer that lies outside the cell envelope, and is thus deemed part of the outer envelope of a bacterial cell. It is a well-organized layer, not easily washed off, and it can be the cause of various diseases. The capsule—which can be found in both gram negative and gram-positive bacteria—is different from the second lipid membrane – bacterial outer membrane, which contains lipopolysaccharides and lipoproteins and is found only in gram-negative bacteria. When the amorphous viscid secretion (that makes up the capsule) diffuses into the surrounding medium and remains as a loose undemarcated secretion, it is known as a slime layer. Capsule and slime layer are sometimes summarized under the term glycocalyx. Composition Most bacterial capsules are composed of polysaccharide, but some species use other materials, such as poly-D-glutamic acid in ''Bacillus anthracis''. Because most capsules ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
