نتایج جستجو برای: oligotrophic bacterium
تعداد نتایج: 49354 فیلتر نتایج به سال:
The globally distributed diazotroph Trichodesmium contributes importantly to nitrogen inputs in the oligotrophic oceans. Sites of dissolved organic matter (DOM) accumulation could promote the mixotrophic nutrition of Trichodesmium when inorganic nutrients are scarce. Nano-scale secondary ion mass spectrometry (nanoSIMS) analyses of individual trichomes sampled in the South Pacific Ocean, showed...
Synechococcus are distributed throughout the world's oceans and are composed of diverse genetic lineages. However, as they are much less abundant than Prochlorococcus in oligotrophic open oceans, their in-depth genetic diversity cannot be investigated using commonly used primers targeting both Prochlorococcus and Synechococcus. Thus, in this study, we designed a primer specific to the 16S-23S r...
We use a combination of simple scalings and analytical expressions as well as an 10 idealized numerical model of basin-scale circulation, biogeochemical cycles and ecology, to elucidate and illustrate factors which regulate the distribution of tracer DINxs = NO − 3 − 16PO 4 , its temporal variability, and the distribution of diazotrophs in the North Atlantic. We infer that the observed subsurfa...
The spatial distribution of an uncultured clade of marine diazotrophic gamma-proteobacteria in the Arabian Sea was investigated by the development of a specific primer pair to amplify an internal fragment of nifH by PCR. These organisms were most readily detected in highly oligotrophic surface waters but could also be found in deeper waters below the nutricline. nifH transcripts originating fro...
In studying metabolic versatility, microbial ecologists often focus on those microbes that grow in extremes of temperature, osmolarity, pressure, and pH; however, these physical settings often contain microbes within high-energy systems such as sulfidic hot springs or photosynthetically driven biofilm communities. The vast majority of microbial species are not situated within such energetically...
Fracture non-union or delayed union frequently occur after high-energy traumas associated to significant bony tissue loss, in open fractures with infections, and after an inappropriate use of internal fixation.1,2,3,4,5,6,7 Obesity, smoking, abuse of alcohol or drugs, osteoporosis and immunodepression are additional factors that prevent bone healing.1,4,6 Based on characteristic of the bone end...
Many marine bacteria have evolved to grow optimally at either high (copiotrophic) or low (oligotrophic) nutrient concentrations, enabling different species to colonize distinct trophic habitats in the oceans. Here, we compare the genome sequences of two bacteria, Photobacterium angustum S14 and Sphingopyxis alaskensis RB2256, that serve as useful model organisms for copiotrophic and oligotrophi...
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