نتایج جستجو برای: tna
تعداد نتایج: 313 فیلتر نتایج به سال:
According to a current "RNA first" model for the origin of life, RNA emerged in some form on early Earth to become the first biopolymer to support Darwinism here. Threose nucleic acid (TNA) and other polyelectrolytes are also considered as the possible first Darwinian biopolymer(s). This model is being developed by research pursuing a "Discontinuous Synthesis Model" (DSM) for the formation of R...
[1] The 2005 North Atlantic hurricane season (1 June to 30 November) was the most active on record by several measures, surpassing the very active season of 2004 and causing an unprecedented level of damage. Sea surface temperatures (SSTs) in the tropical North Atlantic (TNA) region critical for hurricanes (10 to 20 N) were at record high levels in the extended summer (June to October) of 2005 ...
1. Distal blockade by simultaneous administration of ethacrynic acid and chlorothiazide was performed in healthy subjects whose extracellular fluid was expanded by iso-osmotic sodium chloride or bicarbonate. The results obtained were compared with those from non-expanded subjects (Ardaillou & Fillastre, 1969). 2. By this technique urine approximates in composition to proximal tubular fluid and ...
AIMS To evaluate different types of sample storage and DNA extraction techniques for the real-time PCR quantification of cyanobacteria in water. METHODS AND RESULTS Two different filter types for the cell harvest of Microcystis sp. and Planktothrix spp. that were either freeze-dried or stored frozen, and two different methods for DNA extraction were compared. DNA extraction was achieved by st...
• TNA assessment of masonry vaults by solving nonlinear constrained optimisations. A direct optimisation to find the minimum thickness, and GSF, vaults. Robustness vaulted structures through stability domain analyses. numerical approach for with geometry from point clouds. new SDV-based interactive algorithm select independent force densities. This paper presents a methodology assess using Thru...
In the context of prebiotic chemistry, one of the characteristics of mixed nitrogenous-oxygenous chemistry is its propensity to give rise to highly complex reaction mixtures. There is therefore an urgent need to develop improved spectroscopic techniques if onerous chromatographic separations are to be avoided. One potential avenue is the combination of pure shift methodology, in which NMR spect...
The glutamate permeation system in Escherichia coli K-12 consists of three genes: gltC, gltS, and gltR. The genes gltC and gltS are very closely linked, and are located between the pyrE and tna loci, in the following order: tna, gltC, gltS, pyrE; gltR is located near the metA gene. The three glt genes constitute a regulatory system in which gltR is the regulator gene responsible for the formati...
Detection and quantification of enteropathogens in stool specimens is useful for diagnosing the cause of diarrhea but is technically challenging. Here we evaluate several important determinants of quantification: specimen collection, nucleic acid extraction, and extraction and amplification efficiency. First, we evaluate the molecular detection and quantification of pathogens in rectal swabs ve...
File format identification is a core requirement for digital archives. The UNIX file command is among the most promising technologies for file type identification. This report describes extensions to the file command and magic file that enhance their utility for file format identification in archival systems. A File Format Library (database) has been created to manage information about file for...
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