Materials Literature
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Studies of infrared quantum counter upconversion in LaF3:Pr3+ and LaCl3:Pr3+ have led to the discovery of a process in which a red excitation photon results in the emission of a blue photon. When the 1D2 level of Pr3+ is excited by a cw rhodamine 6-G dye laser, blue fluorescence from the 3P0 level is observed. From th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of a pentacoordinate copper(II) hippurate dimerJoe N. Brown and L. M. TrefonasCite this: Inorg. Chem. 1973, 12, 8, 1730–1733Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reversible ligation studies of new low-spin iron(II) complexes containing a planar cyclic tetradentate ligand and other donor molecules including carbon monoxideD. A. Baldwin, R. M. Pfeiffer, D. W. Reichgott, and Norman J. RoseCite this: J. Am. Chem. Soc. 1973,…
Techniques are investigated for studying the distribution of impurity species away from grain boundary fracture surfaces. The first technique involves the measurement of the relative intensities of the various Auger electrons of the impurity species. A comparison of these intensities with those of the pure bulk elemen…
Single-crystal X-ray intensity data have been obtained from a crystal of ferrohypersthene, M&* Feo* Ctuos SiO, at 2O, 175',280', 50O', 700', and 850'C. Refinements of the crystal structure using three dimensional data and anisotropic thermal models have been made at each temperature. Precession photographs indicate th…
High-resolution inelastic-neutron-scattering measurements have been performed at the cubic-rhombohedral ($\mathrm{Pm}3\mathrm{m}\ensuremath{\rightarrow}\mathrm{R}\overline{3}\mathrm{c}$) phase transitions in a low-mosaic flux-grown single crystal of LaA1${\mathrm{O}}_{3}$. The transition occurred at (489 \ifmmode\pm\e…
Abstract Die Darstellung und die spektroskopische Charakterisierung neuer (Octaäthylporphinato)‐metall‐methoxide und ‐phenoxide der Zusammensetzung. (OÄP)AlOMe 3 , (OÄP)MOPh 4 (M = Ga, Mn), (OÄP)CrOPh(PhOH) 5 , (OÄP)M(OMe) 2 6 (M = Si, Ge, Sn), (OÄP)M(OPh) 2 7 (M Si, Ge, Sn), (OÄP)MO(OMe) 8 (M – Mo, W) und (OÄP)MO(O…
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…