Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and biology of vitamin B6. 32. Selective modification of the .alpha.4 position of pyridoxol. 4-Vinyl analog of pyridoxal, a potent antagonist of vitamin B6W. Korytnyk, G. B. Grindey, and B. LachmannCite this: J. Med. Chem. 1973, 16, 7, 865–867Publication Date (Prin…
Sodium diarsenate at room temperature is monoclinic with lattice parameters a = 5.969(1), b = 10.126(1), c = 12.272(3) Å and β = 92.87(2)°. There are four formula units per cell with space group C2/c. The structure was refined by full-matrix least-squares to a final R value of 0.027 utilizing 1157 reflections measured…
In this second contribution the Fraunhofer diffraction patterns from apertures of the form of an equilateral triangle, a square, a regular pentagon, a hexagon and an octagon are compared with the calculated maps of the intensity distribution. For each shape of the aperture the first few maxima and minima of the intens…
(1973). Atomizing molten metals — a review. Canadian Metallurgical Quarterly: Vol. 12, No. 3, pp. 309-322.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of phenyl isocyanate with N-methyl-2-pyrrolidinoneReinhard Richter and Henri UlrichCite this: J. Org. Chem. 1973, 38, 15, 2614–2617Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published inissue 1 July 1973https://pubs.acs.org/do…
The stop-band characteristics of waves in cholesteric-liquid-crystal half-space are investigated using the exact wave solution, the Floquet theorem, and the corresponding Brillouin diagram. The other half-space is filled with a uniform dielectric medium. By appropriate choice of the dielectric constant of the uniform…
Vibrational spectra of a series of halogeno-complex ions of antimony(III) and bismuth(III) are reported. Results of crystal spectra are discussed in terms of the structural environment and a comparative study of Raman solution and solid state spectra is given. Some force constants for hexahalogeno species on a modifie…
Heat capacities of two well characterized polyethylene samples have been measured from 2 to 360 K in a precision vacuum adiabatic calorimeter. The two samples are derived from the same stocks from which NBS standard reference materials (SRM) 1475 and 1476 for linear and branched polyethylene whole polymers, respective…
When describing a crystal structure in terms of the Wyckoff sites occupied, equivalent alternatives often arise because the choice of origin of coordinates is subject to arbitrariness remaining within the standard choice in International Tables for X-ray Crystallography. The problem is explained and simple tables whic…
Vibrational spectra, most of them obtained from Raman scattering, are reported for LiNO3 and NH4NO3 solutions in liquid ammonia, ranging from dilute to the compositions LiNO3/1.6NH3 and NH4NO3/1NH3. All the spectra were obtained from solutions at ambient temperatures. Large changes in the N–H stretching region are cor…
Abstract The relative amounts of freezing and nonfreezing water in various water‐wet cellulose acetate (CA) membranes were determined by NMR techniques, from the initial heights of the water component in the free induction decay (MNR intensity). The results suggest that (1) a significant fraction of the water in vario…
Abstract Raman scattering is observed in first and second order by optically active phonons in mercury sulphide HgS having the cinnabar structure (α‐HgS). For the first time these spectra could be obtained in polarised light and interpreted using selection rules derived by group theoretical considerations. The experim…
The frequency dependence of the ac conductivity of polycrystalline cobalt-iron ferrite Co 3- x Fe x O 4 (1.89≦ x ≦2.08) has been measured in the frequency range 1 kHz∼200 MHz and the temperature range 130∼300 K. The measured conductivity can be expressed as the sum of two kinds of conductivity σ 1 and σ 2 . σ 1 corres…
The Kerr response of seven nematic substances has been measured just above their nematic-isotropic transition temperature, in their isotropic state. If the reciprocal of the Kerr constant B is plotted against temperature, a linear relationship analogous to the Curie-Weiss dielectric relationship in ferroelectrics is f…
This report shows that magnetically isotropic and anisotropic compacts of BaFe12O19 or SrFe12O19 sinter to high density with controlled microstructure in the presence of a liquid phase. The liquid-phase compositions are in the systems MO–SiO2 and MO–Al2O3–SiO2, M=Ba, Sr. Further, it is shown that systems containing MB…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungstovanadate heteropoly complexes. IV. Vanadium(IV) complexesC. M. Flynn, Jr. and M. T. PopeCite this: Inorg. Chem. 1973, 12, 7, 1626–1634Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published inissue 1 July 1973https://pubs.acs.org/d…
Spectral loss measurements performed between 0.5 and 1.15 μm with up to 32-m-long unclad fibers drawn from Suprasil W1, Spectrosil WF, and Corning 7943 synthetic vitreous silica demonstrated that bulk glasses with total losses well below 10 dB/km at certain wavelengths of interest for future optical communication syst…
Individual nitrogenous metabolites have been examined as regulating agents for the breakdown of intracellular proteins in Escherichia coli. Generally, NH(4) (+) is the most effective regulator. Its depletion progressively increases the basal proteolytic rate to maximum in most strains when the doubling time is increas…
A portable hand‐held friction meter has been devised which will measure the coefficient of friction between a reference material and skin at any body site regardless of position. The reference surface can be made of any of a number of materials, such as steel, nylon, PTFE, leather or even fabrics. The effects of disea…
"Nickel and Chromium Plating." British Corrosion Journal, 8(4), p. 147