Now showing items 621-630 of 640
Determination of glucocerebroside, sphingomyelin, free fatty acid and total lipid by thin-layer chromatography and charring-scintillation quenching
(Elsevier, 1982-11-12)
A previously described method has been extended to various specific lipids of liver and brain. The basic method involves thin-layer chromatography followed by charring to reveal the bands. The intensity of each band is ...
Texture development in polyethylene. I. Uniaxial extension and uniaxial compression
(John Wiley & Sons, Inc., 1989-08)
Texture development of high-density polyethylene has been studied by x-ray diffraction at various strains for uniaxial extension, as achieved by uniaxial tension and extrusion, and for uniaxial compression. Pole distributions ...
Synthesis and rearrangements of ortho-selenonium phenoxides
(Elsevier, 1987)
A new class of selenonium zwitterions is prepared from the ortho- substitution of phenols with diphenylselenium bis(trifluoroacetate) 1. The zwitterions undergo a novel thermal rearrangement to produce diaryl ethers.
A general procedure for mild and rapid reduction of aliphatic and aromatic nitro compounds using ammonium formate as a catalytic hydrogen transfer agent
(Elsevier, 1984)
Various aliphatic and aromatic nitro compounds were selectively and rapidly reduced to their corresponding amino derivatives in very good yield using anhydrous ammonium formate as a catalytic hydrogen transfer agent.
The conformation of alkyl sulfoxides
(John Wiley & Sons, Inc., 1981)
Parameters for sulfoxides used in force field MM1 were modified to be incorporated into force field MM2. The conformations of ten alkyl sulfoxides were then calculated using MM2 with these new parameters. The alkyl groups ...
A practical large scale chemical synthesis of chiral glycines
(Elsevier, 1988)
(R)- and (S)-[2-2H]glycine of high chiral purity were synthesized in large quantities in [approximate] 40% overall yield from readily available starting materials via a totally chemical procedure. Reduction of either ...
The microwave spectrum and structure of propylene oxide
(Elsevier, 1982-12)
The rs and ro structural parameters have been determined for propylene oxide from rotational constants for 16 isotopic species. The heavy-atom (ro) parameters are : r(C1C2) = 1.470(3), r(C2C3) = 1.505(2), r(C1O) = 1.441(2), ...
The soluble components of chromaffin granules a carbon-13 NMR survey
(Elsevier, 1980-07-03)
Carbon-13 NMR spectra of the reconcentrated chromaffin granule lysate have been obtained at 50 MHz and 62.9 MHz. The spectrum contains a number of assignable resonances in addition to those of the main soluble components ...
Thermodynamics of copper sulfides I. Heat capacity and thermodynamic properties of copper(I) sulfide, Cu2S, from 5 to 950 K
(Elsevier, 1987-11)
The heat capacity of Cu2S from 5 to 950 K was determined by adiabatic-shield calorimetry and the thermodynamic properties were evaluated. Transitions occur at 376 and about 710 K with [Delta]trsSm = (1.240+/-0.006)R and ...