Xem 1-19 trên 19 kết quả Stereochemistry
  • Tham khảo sách 'drug stereochemistry analytical methods and f'hannacology second edition_1', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Chapter 3 - Structure and stereochemistry of alkanes. In this chapter you will learn: Draw and name the isomers of alkanes, and explain the trends in their physical properties; draw alkane conformations, compare their energies, and predict the most stable conformations; draw and name the isomers of cycloalkanes, and explain ring strain; draw the conformations of cycloalkanes, compare their energies, and predict the most stable conformations.

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  • Stereoisomers, chirality, Examples of Handed Objects, Chirality in Molecules, Absolute Configuration, Properties of Enantiomers, Biological Discrimination,... As the main contents of the document "Stereochemistry". Invite you to consult.

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  • The pharmacy profession and the role of pharmacists in the modern healthcare systems have evolved quite rapidly over the last couple of decades. The services that pharmacists provide are expanding with the introduction of supplementary prescribing, provision of health checks, patient counselling and many others. The main ethos of pharmacy profession is now as much about keeping people healthy as treating them when they are not well.

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  • Chirality is a phenomenon that is manifested throughout the natural world, ranging from fundamental particles through the realm of molecules and biological organisms to spiral galaxies. Thus, chirality is of interest to physicists, chemists, biologists, and astronomers. Chiroptical spectroscopy utilizes the differential response of chiral objects to circularly polarized electromagnetic radiation. Applications of chiroptical spectroscopy are widespread in chemistry, biochemistry, biology, and physics. It is indispensable for stereochemical elucidation of organic and inorganic molecules.

    pdf0p hotmoingay 03-01-2013 14 5   Download

  • In this chapter, we study the three-dimensional structures of molecules to understand their stereochemical relationships. We compare the various types of stereoisomers and study ways to differentiate among stereoisomers. In future chapters, we will see how stereochemistry plays a major role in the properties and reactions of organic compounds.

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  • Tham khảo sách 'comprehensive chiroptical spectroscopy volume 1', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • the beginning, medicinal therapy consisteodf concoctions coadministered with incantations. Little thought was given to dissecting out the contributions of the pharmacology of the concoction from the spiritual consequences of the incantations. Eventually, potions and extracts were recognized to have predictable activity that could be observed and described objectively. Then came the capacity to estimate potency,t o l eading concentration and purification.

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  • The biologically most significant genotoxic metabolite of the environmental pollutant benzo[a]pyrene (B[a]P), (+)-7R,8S-diol 9S,10R-epoxide, reacts chemically with guanine in DNA, resulting in the predominant formation of (+)-trans-B[a]P-N 2 -dG and, to a lesser extent, (+)-cis-B[a]P-N 2 -dG adducts.

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  • Synthetic rhamnolipids, derived from a natural diacylated glycolipid, RL-2,214, produced by Burkholderia(Pseudomonas) plantarii, were analyzed biophysically. Changes in the chemical structures comprised variations in the length, the stereochemistry and numbers of the lipid chains, numbers of rhamnoses, and the occurrence of charged or neutral groups.

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  • The synthesis of 10 new phosphoenolpyruvate (PEP) analogues with modifications in the phosphate and the carboxylate function is described. Included are two potential irreversible inhibitors of PEP-utilizing enzymes. One incorporates a reactive chloromethylphosphonate function replacing the phosphate group of PEP. The second contains a chloromethyl group substituting for the carboxylate function of PEP. An improved procedure for the preparation of the known (Z)- and (E)-3-chloro-PEP is also given.

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  • Chapter 8 - Reactions of Alkenes. This chapter include objectives: Explain why electrophilic additions are among the most common reactions of alkenes; Predict the products of the reactions of alkenes, including the orientation of the reaction (regiochemistry) and the stereochemistry; propose mechanisms to explain the observed products of alkene reactions; use retrosynthetic analysis to solve multistep synthesis problems with alkenes as reagents, intermediates, or products.

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  • Chapter 9 introduce to Alkynes. In this chapter, students will be able to: Draw and name alkynes, cycloalkynes, and their derivatives; show how to synthesize alkynes by eliminations from alkyl halides and by the additions and substitutions of acetylide ions; predict the products of the reactions of alkynes, including the orientation of the reaction (regiochemistry) and the stereochemistry;...

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  • With the aim of extending our knowledge on the reaction pathways of Zn-metallothionein (MT) and apo-MT species in the presence of Hg(II), we monitored the titration of Zn7-MT, Zn4 -aMT and Zn3 -bMT proteins, at pH 7 and 3, with either HgCl2or Hg(ClO4 )2 by CD and UV-vis spectr-oscopy.

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  • Ribosomes position their substrate at stereochemistry suitable for peptide bond formation, and promote substrate-mediated cata-lysis. The linkage between substrate orientation, dominated by remote interactions, and a sizable symmetrical region identified in all known ribosome structures indicates a guided rotatory motion of aminoacylated-tRNAs along a ribosomal path leadings to the advance of nascent peptides into the protein exit tunnel at an extended conformation.

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  • Many pharmacologically important agents are assembled on multimodular nonribosomal peptide synthetases (NRPSs) whose modules comprise a set of core domains with all essential catalytic functions necessary for the incorporation and modification of one building block. Very often, d-amino acids are found in such products which, with few exceptions, are generated by the action of NRPS integrated epimerization (E) domains that alter the stereochemistry of the corresponding peptidyl carrier protein (PCP) bound l-intermediate....

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  • Flavoproteins are ubiquitous redox proteins that are involved in many biological processes.In the majority of flavoproteins, the flavin cofactor is tightlybut noncovalently bound.Reversible dissociation of flavoproteins into apo-proteinandflavinprostheticgroupyields valuable insights in flavoprotein folding, functionandmechanism.Replacement of the natural cofactorwithartificial flavins has proved tobe especially useful for the determination of the solvent acces-sibility, polarity, reaction stereochemistry and dynamic behaviour of flavoprotein active sites....

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  • A furanolabdane diterpene alcohol was isolated from the rhizomes of the endemic Vietnamese medicinal plant Alpinia tonkinensis Gagnep. (Zingiberaceae). Its absolute stereostructure was established to be (12S)-15,16-epoxy-8(17),13(16),14-labdatrien-12-ol from spectroscopic data and by applying the modified Mosher’s method. It is first report on the natural occurrence and absolute stereochemistry of the diterpene which was previously known as a synthetic intermediate.

    pdf4p uocvong04 24-09-2015 8 2   Download


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