Materials Literature
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Previous experiments have indicated that the gam gene of bacteriophage lambda is responsible for an inhibition of the RecBC DNase-an enzyme that is essential for the major host pathway of genetic recombination. We report here experiments that define the inhibitor as the protein product of the gam gene ("gamma-protein"…
Abstract Clayey fragments colored deep bluish-green are widely found in glassy rhyolitic tuffs at Oya, Tochigi Prefecture. In room-air the color changes to black or gray within one hour and finally to brown in a few weeks. The fragments are composed of an intimate mixture of two kinds of smectite: a ferrous iron-rich…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTButene isomerization over zinc oxide and chromiaC. C. Chang, W. C. Conner, and R. J. KokesCite this: J. Phys. Chem. 1973, 77, 16, 1957–1964Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https://pubs.acs.org…
Abstract It is shown that the linear superlattice distorsion of periodicity 6 × 2.88 Å, which was recently observed by X‐ray diffuse scattering in the one dimensional conductors of the type K 2 Pt(CN) 4 Br 0.30 · x H 2 O, looses progressively its one‐dimensional character for temperatures lower than 120 °K. This seems…
Preparations of TPN-linked nonreversible d-glyceraldehyde 3-phosphate dehydrogenase (EC 1.2.1.9), free of TPN-linked reversible d-glyceraldehyde 3-phosphate dehydrogenase, have been obtained from green shoots, etiolated shoots, and cotyledons of pea (Pisum sativum), cotyledons of peanut (Arachis hypogea), and leaves o…
The dehydrogenation and dehydration of 2-propanol on manganese ferrite has been studied between 306 and 362 °C. The selectivity for dehydrogenation was constant throughout the temperature range. At 362 °C a trace of condensation of the alcohol to mesityl oxide was detected, < 0.1% v/v of the reaction products.
Abstract Measurements of the specific heat of configurationally ordered and disordered FeCo between 1.2 and 4.2 °K are presented. The coefficients of the electronic and harmonic phonon contributions decreased on ordering (by 16% and 20%, respectively). The effects on the electronic term are mainly associated with a ch…
Abstract Single crystals of linear polyethylene, prepared from a dilute xylene solution, were annealed below their melting temperature under atmospheric and 6 kbar pressure. In order to preserve the identity of the single crystals, they were suspended in an inert solvent medium, silicone oil and ethanol, during anneal…
SUMMARY It is demonstrated that the only requisite for a true three‐dimensional image is the presence of parallax in the stereo‐pair. This parallax is introduced into electron micrographs by tilting the specimen between exposures. After deriving the usual parallax equation several examples of the use of stereo‐measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of porphyrins. IV. Behavior of di- and tetrahydroporphyrins under alkaline conditions. Direct observation of the chlorin-phlorin equilibriumH. W. Whitlock and M. Y. OesterCite this: J. Am. Chem. Soc. 1973, 95, 17, 5738–5741Publication Date (Print):August 1, 1973Pub…
Results of Diamond and Wert on the kinetics of the reorientation of carbon pairs in nickel are used to demonstrate that the low activation energy reported by Massaro and Petersen for diffusion of carbon in nickel at 350–-700°C cannot be explained by a change in the mechanism for the lattice migration of carbon. Bounda…
Magnetization measurements were made on a single crystal of ferromagnetic MnAlGe from 4.2 K to 350 K in order to determine the uniaxial magnetic anisotropy constant K 1 . The saturation moment and K 1 extrapolated to 0 K are 1.70 µ B /Mn and 9.7×10 6 erg/cc, respectively. The observed temperature dependence of K 1 , a…
The thermal expansion coefficients of the corundum structure oxides Ti2O3 and V2O3 were measured by elevated-temperature x-ray diffraction techniques, the former to 300 °C and the latter to 1000 °C. Compared with corundum, both of these oxides exhibit deviations in their thermal expansion behavior which may be attribu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConversion of dihydridodiammineboron(III) borohydride to ammonia-borane without hydrogen evolutionErwin MayerCite this: Inorg. Chem. 1973, 12, 8, 1954–1955Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973http…
The magnetization and the Mössbauer effect were studied for Tm2Fe17 as a function of temperature in the range 4.2–350 K. The results indicate a magnetic phase transition near 72 K.
Abstract The storage and loss shear moduli, G , and G ˝, have been measured for solutions of three samples of poly‐γ‐benzyl‐ L ‐glutamate with molecular weights from 16 to 57 × 10 4 , by use of the Birnboim‐Schrag multiple‐lumped resonator. The frequency range was 106 to 6060 H z , the concentration range 0.0015–0.005…
Fission fragment tracks produced on prepared surfaces of uranium dioxide were observed by replica electron microscopy. Several statistical analyses and measurements were performed on the observed tracks to be compared with theoretical studies of a fission fragment passing through a stopping medium. A temperature distr…
Abstract Approximately 5% of all organic compounds are transformed at their melting point into liquid crystals—thermodynamically stable, anisotropic liquids which in contrast to isotropic melts appear turbid and are also known as mesophases. Such melts are classed as smectic, nematic, and cholesteric liquid crystallin…
The multiphonon relaxation process has been studied in the host crystals YV${\mathrm{O}}_{4}$, YAs${\mathrm{O}}_{4}$, and YP${\mathrm{O}}_{4}$ using the rare earths ${\mathrm{Ho}}^{3+}$, ${\mathrm{Er}}^{3+}$, ${\mathrm{Eu}}^{3+}$, and ${\mathrm{Pr}}^{3+}$ as probes. Lifetimes were measured with the phase-shift techniq…