نتایج جستجو برای: gender dependency enantiomers
تعداد نتایج: 211678 فیلتر نتایج به سال:
T he fundamentals of structure and stereochemistry have been considered in previous chapters in some detail. There are, however, practical aspects of stereochemistry that have not yet been mentioned, particularly with regard to chiral compounds. How, for instance, can a racemic mixture be separated into its component enantiomers (resolution); what methods can be used to establish the configurat...
2014 Microscopical, miscibility and X-ray studies establish the existence of two new mesophases in the two enantiomers of 1 (methyl)-heptyl terephthalidene bis amino cinnamate. In one of this two mesophases the two enantiomers do not exhibit a total miscibility range; while for the second the untwisted form observed with the racemic mixture has a higher temperature range of stability than the t...
Optically active isomers of N-methy1-2-(2-(2-(4-phenylpiperazino)ethoxy)phenyl)thiazolidine3-carboxamides(( + )-2 and(-)-2) have been synthesized and tested for positive inotropic activity. The racemic thiocarboxamide((•})-3) was resolved into the enantiomers(( + )-3 and(•E)-3) via the Land D-N-(2-naphthylsulfonyl)prolyl derivatives ((+ )-4 and (-)-4). Conversion of the thiocarboxamides (( + )-...
This paper describes the application of stereoselective antibodies as tailor-made chiral selectors for the separation of enantiomers in HPLC under isocratic conditions. Stereoselective monoclonal antibodies to D- and L-alpha-amino acids, raised against protein conjugates of p-amino-D- and L-phenylalanine, were immobilized on a synthetic high-flow-through support material and used for rapid enan...
Propafenone is an antiarrhythmic drug that produces a variable degree of P3-blockade in humans and is administered as a racemate. To examine the relative contribution of the individual enantiomers to pharmacologic effects seen during treatment with propafenone, we assessed the steady-state plasma concentrations of (+)-S-propafenone and (-)-R-propafenone in seven patients who were on long-term o...
Separation of the enantiomers of chiral drugs has become an important issue in analytical clinical chemistry in recent years, because of differences in the biological activity and pharmacokinetic properties of drug enantiomers [1,2]. Many drugs contain chirality centers; their enantiomers may have considerably different potency, type of pharmacological activity, pharmacokinetics, and metabolism...
Successful language use requires access to products of past processing within an evolving discourse. A central issue for any neurocognitive theory of language then concerns the role of memory variables during language processing. Under a cue-based retrieval account of language comprehension, linguistic dependency resolution (e.g., retrieving antecedents) is subject to interference from other in...
A chemically bonded cellulose tris(3,5-dimethylphenylcarbamate) chiral stationary phase (CSP) was prepared by a radical polymerization reaction. The prepared CSP was packed into fused-silica capillaries with inner diameter of 75 microm to perform enantiomer separations in CEC. The electrochromatographic behavior of the CSP was investigated. On the prepared CSP, high EOF could be generated under...
Most large molecules are chiral in their structure: they exist as two enantiomers, which are mirror images of each other. Whereas the rovibronic sublevels of two enantiomers are almost identical (neglecting a minuscular effect of the weak interaction), it turns out that the photoelectric effect is sensitive to the absolute configuration of the ionized enantiomer. Indeed, photoionization of rand...
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