Nmr spectrum

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  • uclear magnetic resonance spectroscopy can now be used to investigate the biochemical energetics of human tissues and organs noninvasively. The method already has increased our understanding of some muscle diseases, has provided information from muscle metabolism about whole-body functions, control, and hormonal status, has helped in the elucidation of hitherto unrecognized causes of disease, and yielded new ideas about the control of bioenergetics in vivo. Studies on the biochemistry of human brain, liver, heart, and kidney are just beginning.

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  • Chapter 13 - Nuclear magnetic resonance spectroscopy. In this chapter, students will be able to understand: Use the chemical shifts, splitting patterns, and integrations shown in a proton NMR spectrum to propose structures for possible compounds; use the number of peaks and their chemical shifts in a 13C NMR spectrum to determine the number of types of carbon atoms in the compound and what functional groups they might represent;...

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  • The NMR solution structures of NTX-1 (PDB code 1W6B and BMRB 6288), a long neurotoxin isolated from the venom ofNaja naja oxiana, and the molecular dynamics simulation of these structures are reported. Calculations are based on 1114NOEs, 19 hydrogen bonds, 19 dihedral angle restraints and secondary chemical shifts derived from 1 Hto 13 C HSQC spectrum. Similar to other long neurotoxins, the three-finger like structure shows a double and a triple strandedb-sheet aswell as some flexible regions, particularly at the tip of loop II and the C-terminal tail....

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  • d-Aminolevulinic acid (ALA), which is an intermediate in the biosynthesis of chlorophyll a, can be biosynthesized via theC5pathway and the Sheminpathway inEuglena gracilis. Analysis of the 13 C-NMR spectrum of 13 C-labeled methyl pheophorbidea, derived from 13 C-labeled chlorophylla biosynthesized fromD-[1-13 C]glucose byE. gracilis,provid-ed evidence suggesting that ALA incorporated in the 13 C-labeled chlorophyllawas synthesized via both the C5 pathway and the Shemin pathway in a ratio of between 1.5 and 1.7 to one....

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  • Chitosan oligomers were prepared by oxidative degradation of chitosan (with hydrogen peroxide) under microwave irradiation. This is convenient, friendly and effective method to prepare chitosan oligomers. By 1 H-NMR, IR spectrum, the structure of the products was identified and keeps the same as of chitosan. By LC-MS analysis, it proved that chitosan was decomposed to five fractions, the smallest one about D- glucosamine 3 units (at least).

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  • Six new benzopyran derivatives were synthesized by reduction reaction and Michael reaction from malloapelta B.

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  • Three terpenes with Protostane type were isolated from the rhizomes of Alisma plantago- aquatica. The chemical structures of isolated compounds were characterized as 11 ,23S,24R,25- tetrahydroxyprotost-13(17)-en-3-one (alisol A, 1), 11 ,23S,25-trihydroxyprotost-13(17)-en-3- one-24R-yl acetate (alisol A acetate, 2), and 11 ,23S,24S-trihydroxyprotost-13(17),25-dien-3-one (alisol G, 3), by detailed analysis of the 1D- and 2D-NMR spectra such as 1 H-, 13 C-NMR, DEPT 90, DEPT135, HSQC, HMBC, 1 H- 1 H COSY, and by the Electronspray Ionization (ESI) mass spectrum.

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