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Incorporation of (2RS,3S)-(4-13S)valine into cephalosporin C.
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Membrane conformations and their relation to cytotoxicity of asimicin and its analogues.
Certain plant species belonging to the family Annonaceae produce Annonaceous acetogenins, which are a unique class of long-chain fatty acid derivatives with potent cytotoxicity. Putative proteinExpand
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Nuclear magnetic resonance spectroscopy. Carbon-13 chemical shifts in norbornyl derivatives
The ^(13)C chemical shifts for a number of norbornyl derivatives have been obtained in natural abundance. The compounds studied were the series of methylnorbornanes, methylnorbornenes,Expand
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Examination of Homogeneous Broadening in Solids via Rotationally Synchronized Spin-Echo NMR Spectroscopy
Abstract Carbon linewidths of 0.8 and 1.3 Hz have been measured for the aromatic and methyl resonances of polycrystalline hexamethylbenzene. These extremely narrow linewidths are obtained with aExpand
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The use of 13C n.m.r. (c.m.r.) spectroscopy in biosynthetic studies of β-lactam antibiotics I. The incorporation of [1-13C]- and [2-13C] sodium acetate, and dl-[1-13C]- and dl-[2-13C] valine into
The unique chemical and biological properties of β-lactam antibiotics and, in particular, the importance of penicillins and cephalosporins in the treatment of a variety of bacterial infections haveExpand
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Coherent broad-band decoupling—An alternative to proton noise decoupling in carbon-13 nuclear magnetic resonance spectroscopy
Abstract Phase modulation of the decoupler carrier frequency with a 50% duty cycle square wave is shown to be an efficient method for broad-band decoupling. Experimental and theoretical studies showExpand
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A new mechanism for spin--lattice relaxation of heavy nuclei in the solid state: 207Pb relaxation in lead nitrate.
A detailed investigation of the spin-lattice relaxation time, T1, for 207Pb in solid lead nitrate has been undertaken in an effort to understand the mechanism of relaxation. The results show that theExpand
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