Now showing items 41-50 of 50
Mixed-crystal infrared studies of chain folding in polyethylene single crystals: Effect of crystallization temperature
(John Wiley & Sons, Inc., 1982-07)
Mixed crystals of polyethylene (PEH) and various-molecular-weight perdeuterated polyethylenes (PEDs) have been prepared at 80°C and their infrared spectra compared with those of samples grown at 55°C. Concentrations of 80 ...
Vibrational analysis of peptides, polypeptides, and proteins. XV. Crystalline polyglycine II
(Wiley Subscription Services, Inc., A Wiley Company, 1982-12)
A force field has been refined for the 3 1 -helix structure of polyglycine II, using the polyglycine I force field plus previous C Α H Α ...O force constants as a starting point. Besides force constants associated with the ...
Vaporization and thermodynamic properties of samarium dicarbide and sub-stoichiometric disamarium tricarbide
(Elsevier, 1982-11)
The vaporization reactions of SmC2(s) and Pu2C3-type SmCy(s, 1.36 y SmC2(s) = 2C(s)+Sm(g){2/(2-y)}SmCy(s) = {y/(2-y)}SmC2(s)+Sm(g)The complex reaction for SmCy occurs because the composition of the carbon-rich boundary of ...
Carbon-13 and silicon-29 NMR spectra of some [tris(trimethylsilyl)methyl]-substituted silanes and related compounds
(Elsevier, 1982-08-24)
Fourier Transform 13C and 29Si NMR spectra are reported for series of [tris-(trimethylsilyl)methyl] dimethylsilanes, [tris(trimethylsilyl)methyl] diphenylsilanes, and for related compounds. Analysis of chemical shift values ...
Micellization and intermicellar interactions in aqueous sodium dodecyl benzene sulfonate solutions
(Elsevier, 1982-12)
Quasielastic light scattering was used to investigate the size and shape of sodium dodecyl benzene sulfonate (SDBS) micelles in aqueous solutions. Measurements were made as a function of temperature and NaCl and SDBS ...
Electrochemical reduction of 4-aminopyrimidine and cytosine in dimethyl sulfoxide
(Elsevier, 1982-12-23)
The electrochemical reduction in dimethyl sulfoxide of cytosine (4-amino-2-hydroxypyrimidine) and one of its model compounds (4-aminopyrimidine) has been examined. Initially, each pyrimidine (RH) undergoes a reversible, ...
Reduction of ketones by sodium borohydride in the absence of protic solvents. Inter versus intramolecular mechanism
(Elsevier, 1982)
Acetone, acetophenone and benzophenone react with sodium borohydride in the absence of protic solvent to give the corresponding tetraalkoxyborates. In view of theseresults, the possibility of the 4-centre mechanism for ...
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 ...
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), ...