- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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Computer-controlled linear pH gradient for high-performance liquid chromatographic fractionations of aromatic carboxylic acids and of humic and fulvic acids ... Then, this gradient was applied to fractionations of a series of aromatic carboxylic acids as well as to a differentiation of four humic acids and one fulvic acid. Recommended …
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Membrane Fractionation by Isopycnic Sucrose Density Gradient Centrifugation for Qualitative Analysis of LPS in Escherichia coli. Authors: Elisabete C ... then the membrane fractions are collected by ultracentrifugation and separated at high speed by exploiting the differences in membrane density. The fractions obtained are analyzed for LPS ...
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At early times when the magnesium flux is overwhelmingly due to the steep composition gradients, the isotopic fractionations are negative. However, as the diffusive core develops and the chemical gradient declines, the thermally driven flux of magnesium becomes proportionately more important.
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X-band high-gradient linear accelerators are a challenging and attractive technology for compact electron linear-accelerator facilities. The Very Compact Inverse Compton Scattering Gamma-ray Source (VIGAS) program at Tsinghua University will utilize X-band high-gradient accelerating structures to boost the electron beam from 50 to 350 …
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Global fractionations include latitudinal and longitudinal fractionations. Latitudinal transect is the major reason for POPs to be fractionated into the polar surface media. Decreasing temperature gradient along the latitude prompts accumulation of POPs in cold polar regions (polar cold trapping).
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comes from a temperature gradient which is too steep (i.e., large values of L1 T per em column length). Solvent/nonsolvent gradients which are too steep hinder the full adjustment of the sol-gel equilibrium, especially in the high-MW range. Flow rates too high or low influence the stepwise column extraction less than the other procedures.
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High-performance liquid chromatography (HPLC) was developed during the 1960s as a direct offshoot of classic column liquid chromatography through improvements in the technology of columns and instrumental components (pumps, injection valves, and detectors). Originally, HPLC was the acronym for high-pressure liquid …
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These approaches were compared with peptide–peptide separation, using in the first dimension, either high-pH RP, SCX with a salt gradient, or SCX LC with a pH gradient Citation [21]. Results showed that protein fractionation using RP-high-performance LC (HPLC) and peptide fractionation using high-pH RP-HPLC yielded the …
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The principle of fractionation by gradient non-solvent precipitation. Fractionation by gradient non-solvent precipitation is based on phase separation of polysaccharide solutions. Polysaccharides of different molecular weights or chemical structures have different solubility.
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It is observed that leaf wax δDn-alkane values between major high plant lineages (eudicots versus monocotyledonous species) differed significantly under the same environmental conditions, and biological factors inherited from plant taxonomies have a significant effect on controlling leaf wax Greek letter values in higher plants.
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Changes in soil organic carbon contents and fractionations of forests along a climatic gradient in China. Formally Refereed. Authors: Xiaolu Sun, Zuoxin Tang, Michael G. Ryan, Yeming You, Osbert Jianxin Sun: Year: ... Changes in soil organic carbon contents and fractionations of forests along a climatic gradient in China. Forest Ecosystems. 6(1 ...
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Plants are alternative source of natural medicines due to secondary active metabolites. Fagonia cretica extracts and Gradient High-Pressure Liquid Chromatography fractionations were checked against multidrug-resistant gastrointestinal pathogens including, Salmonella typhi, Escherichia coli and Shige …
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Purpose Soil aggregates regulate soil water and temperature, soil fertilizer, and leaf gas exchange. In desert steppes, precipitation restricts the growth and development of plants, and it affects the availability of soil carbon and nitrogen, thereby influencing soil aggregate stability. However, studies on precipitation influence on the …
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Membrane Fractionation by Isopycnic Sucrose Density Gradient Centrifugation for Qualitative Analysis of LPS in Escherichia coli Methods Mol Biol. ... then the membrane fractions are collected by ultracentrifugation and separated at high speed by exploiting the differences in membrane density. The fractions obtained are analyzed for LPS total ...
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