نتایج جستجو برای: pure substances
تعداد نتایج: 149540 فیلتر نتایج به سال:
introduction: children may be intentionally or unintentionally exposed to any substance. substance poisoning is one of the most important emergency interventions in children that cause a great number of deaths each year. regarding the importance of this issue and recent increase in number of poisoning cases, a study with the aim of investigating cases of substance poisoning and factors involved...
A high-speed counter-current chromatography (HSCCC) method was successfully developed for the preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus in one step. The purity of deoxyschizandrin was 98.5%, and the structure was identified by MS, UV and NMR. This method was simple, fast, convenient and appropriate to prepare pure compound as reference su...
A set of seized "legal high" samples and pure novel psychoactive substances have been examined by surface-enhanced Raman spectroscopy using polymer-stabilized Ag nanoparticle (Poly-SERS) films. The films both quenched fluorescence in bulk samples and allowed identification of μg quantities of drugs collected with wet swabs from contaminated surfaces.
Liquid-Liquid Immiscibility in Pure Fluids: Polyamorphism in Simulations of a Network-Forming Fluid.
We report Monte Carlo simulations that show both vapor-liquid and closed-loop liquid-liquid equilibrium in a pure substance, for a model fluid that forms orientation-dependent intermolecular bonds. This is the first time that direct evidence of liquid-liquid immiscibility in a pure fluid has been found using exact methods. Because the model is formulated in terms of a tetrahedrally coordinated ...
Although lectin-reactive molecules in biomembranes are generally glycoproteins (1,2), lectins also bind glycolipids (3-9). For a detailed study of leetin-glycolipid interaction we required substances of defined structure. Because isolation of naturally occurring glycolipids is time consuming and only small quantities are generally obtained pure, we synthesized these compounds. In this paper we ...
Lipid compounds are gaining increasing attention due to a wide range of applications in the food industry. Particularly, supercritical carbon dioxide (SCCO2) is being successfully employed as a green solvent in the extraction and fractionation of nonpolar lipids. Knowledge of the solubility of pure lipid-type substances and their mixtures in SCCO2 is essential for evaluating the viability of su...
Increase in emergence of drug-resistant strains of microorganisms have necessitated finding natural compounds with antimicrobial properties and negligible side effects. Microalgae rich in active metabolites could be used in this branch of pharmaceutical industries. Chlorella vulgaris a microalgae was collected from the International Sturgeon Institute- Rasht- Iran. Antibacterial activities of h...
The present study applied the microscopic powder identification technique to determining the adulterated seasoning powders from several plant origins, such as chili, pepper, cumin and mustard. The microscope observation results showed that the chili powder were adulterated with the fragments of plant straws, foliage and other substances; the pepper powder were adulterated with starch, straws an...
Antigenic extracts of Streptococcus group E (SGE) were subjected to fractional ethanol precipitation, block (preparative) electrophoresis, and gel filtration for the purpose of separating the type antigen from the group antigen. Ethanol precipitation was ineffective in separating the substances. Block electrophoresis yielded serologically pure group antigen and a mixture of type and group antig...
DURING the past few years, an extended study has been made in these laboratories of the chemistry of certain constituents of the forage grasses, the nitrogenous substances and the fats and waxes having received particular attention. Samples of a number of grasses of pure strain and known history being available, the opportunity was taken to examine the cell-wall substances of certain of these. ...
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