نتایج جستجو برای: coccoid
تعداد نتایج: 486 فیلتر نتایج به سال:
The discovery of a microbial ecosystem in ocean sediments has evoked interest in life under extreme energy limitation and its role in global element cycling. However, fundamental parameters such as the size and the amount of biomass of sub-seafloor microbial cells are poorly constrained. Here we determined the volume and the carbon content of microbial cells from a marine sediment drill core re...
Vibrio cholerae persists in aquatic environments predominantly in a nonculturable state. In this study coccoid, nonculturable V. cholerae O1 in biofilms maintained for 495 days in Mathbaria, Bangladesh, pond water became culturable upon animal passage. Culturability, biofilm formation, and the wbe, ctxA, and rstR2 genes were monitored by culture, direct fluorescent antibody (DFA), and multiplex...
Transmission electron microscopy (TEM) and epifluorescence microscopy were used to obtain comparative measurements of total bacterial counts, and to enumerate abundances of various bacterial morphotypes in an eutrophic freshwater habitat. Although particulate matter would have been expected to interfere with counting by obscuring large areas of the electron microscope grids, estimates of total ...
In a study of microbial utilization of paired hydrocarbon and nonhydrocarbon substrates, an isolate derived from the Mary's River, Benton County, Oregon, was found to have limited growth on glucose alone in a mineral salts medium at 30 C (L. D. Bushnell and H. F. Haas, J. Bacteriol. 41:653, 1944). However, in the presence of 0.5% n-hexadecane (99% purity; Humphrey Chemical Co., North Haven, Con...
A brackish lagoon at Itaipu, Brazil, contains magnetotactic bacteria with unusually large magnetite magnetosomes (lengths 100-200 nm). The micromagnetic structures of the magnetosomes from two different coccoid organisms from the lagoon have been determinedby electron holography.The results are consistentwith single-magnetic-domain structure in the elongated magnetosomes from one organism and m...
Helicobacter pylori can transform, in vivo as well as in vitro, from dividing spiral-shaped forms into nonculturable coccoids, with intermediate forms called U forms. The importance of nonculturable coccoid forms of H. pylori in disease transmission and antibiotic treatment failures is unclear. Metabolic activities of actively growing as well as nonculturable H. pylori were investigated by comp...
the species of lactobacillus are widely present in many natural environments that areimportant in fermented processes. among these species some belong to the lactic acid bacteria group that areuseful in fermented food. one of the species of lactobacilli group such as l. plantarum provides health benefits,but their identification is one of the main issue. in order to proceed with this project, c...
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