Mega spore4/15/2023 ![]() unintentional orthographic error (unlikely given the fact that de Bary and his students, consistently used the epithet "megaterium"), whereas it should have been megatherium, from therion ( θηρίον, meaning "beast" ), to mean "great beast".Three hypotheses of the epithet "megaterium" are possible: ![]() megaterium is a nominative noun in apposition (see Rule 12 of IBCN ) and is formed from the Greek adjective mega, ( μέγας, μεγάλη, μέγα) meaning "great", and a second word of unclear etymology. This trend continues as many scientists (mainly from the developing world) still use the name B. megatherium assuming the name was incorrectly spelled. However, some subsequent authors called it B. The species was described by de Bary in 1884, who called it Bacillus megaterium, but did not give an etymology. Colonies are detected by their appearance and suspects should be observed microscopically for the typically large cells of this species. However, not all strains can use nitrate, therefore the recommendation to use the ammonium ((NH 4) 2SO 4) medium in parallel. White, round, smooth and shiny colonies 1–3 mm in diameter may develop on the nitrate (KNO 3) medium in 36–48 hours. The procedure starts with plating 0.1 ml of dilutions of heat-treated soil suspensions on glucose mineral base agar: 10g Glc 1g (NH 4) 2SO 4 or KNO 3 0.8g K 2HPO 4 0.2g KH 2PO 4 0.5g MgSO 4♷H 2O 0.05g CaSO 4♷H 2O 0.01g FeSO 4♷H 2O 12g agar distilled water to 1 litre adjust pH 7.0. The method of described in can be used to isolate strains of B. It has also been isolated from cow feces, emperor moth caterpillars and greater wax moth frass. In addition to being a common soil bacterium and an endophyte, it can be found in various foods (including honey and bee pollen, in which most microorganisms do not grow) and on a variety of surfaces, including clinical specimens, leather, paper, stone etc. Isolation īacillus megaterium is ubiquitous in the environment around us. cereus, although itself being relatively harmless. megaterium has a complex plasmid content as well as some phenotypic and phylogenetic similarities with pathogens B. megaterium a century ago, but only recently confirmed as a different species. megaterium can be considered a halophile, as growth on up to 15% NaCl has been observed. The accumulation of the polymer is greatly increased in a saline (2–10% NaCl) environment, in which the polymer comprises largely of L-glutamate (L-isomer content up to 95%). īacillus megaterium is known to produce poly-γ-glutamic acid. Several of these bioactive compounds are cyclic lipopeptides, belonging to the surfactin, iturin and fengycin lipopeptide families, which are also produced by several other Bacillus species. Further, it is used for the production of pyruvate, vitamin B12 and molecules with fungicidal and antiviral properties. It also produces enzymes for modifying corticosteroids, as well as several amino acid dehydrogenases. It produces penicillin amidase used to make synthetic penicillin and several enzymes, like amylases used in the baking industry and glucose dehydrogenase used in glucose blood tests. īacillus megaterium has been an important industrial organism for decades. Nitrogen fixation has been demonstrated in some strains of B. It has been recognized as an endophyte and is a potential agent for the biocontrol of plant diseases. Some isolates from an Antarctic geothermal lake were found to grow at temperatures up to 63 ☌. megaterium grows at temperatures from 3 ☌ to 45 ☌, with the optimum around 30 ☌.
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