Materials Literature
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Interfacial reactions and enhanced wetting or spreading of Na 2 Fe x Si 2 O 5+x and Na 2–2x Fe x Si 2 O 5 glasses on substrates of high‐purity (Marz) and commercial (Armco) iron were observed at 1000°C at low partial pressures of O 2 and Na. Reactivity increased with increasing O/Si ratio in the glass, with the purity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium-sulfur system. I. Differential thermal analysisDjong-Gie OeiCite this: Inorg. Chem. 1973, 12, 2, 435–437Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://pubs.acs.org/doi/10.1021/ic50120a038…
The crystal structures of clinohumite [Mgs.rzFeo.ooMno.oeTio.ozCao.oor(SiOe)rFr.orHo.gaoo,osi a:4.jMt(2);b:10. 2501(5);c:t3.663 5(3)A; d:100.786(2);P2 t/blandtitanocli nohumite [Mgz a:Fer orMno o;Tio rrcao oor(Sior)aoHr.oroo.goi a : 4.7451(8); b : 10.288(2); c : 13.709(3)A; a = 101.00(2).; P2tlblhave been refined by t…
The existence of anionic conductivity in halogen‐containing lead silicate glasses was proved by Tubandt tests and electron microprobe examinations. Direct‐current volume resistivities, loss tangents, and dielectric constants are reported for analogous glasses containing F − , Cl − , Br − , and I − and compared to thos…
Cultures of human diploid fibroblasts were labeled with radioactive proline and glycine, and the precursor of collagen (procollagen) in cells and medium was characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A covalently assembled molecule with the composition (pro alpha1)(2).pro alpha2 (appro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the reaction of amine complexes of cobalt(II) protoporphyrin IX dimethyl ester with oxygen. Evidence for hydrogen bonding with coordinated oxygenDennis V. Stynes, H. Cleary. Stynes, James A. Ibers, and Brian R. JamesCite this: J. Am. Chem. Soc. 1973, 95, 4, 1142–…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic absorption spectrum of nitrate ion and boron trihalidesH. J. Maria, J. R. McDonald, and S. P. McGlynnCite this: J. Am. Chem. Soc. 1973, 95, 4, 1050–1056Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 Febru…
Measurements of the angular dependence of the upper critical field ${H}_{c2}$ in the transition metal dichalcogenides Ta${\mathrm{S}}_{2}$, Ta${\mathrm{S}}_{2}$-(pyridine), Ta${\mathrm{S}}_{1}$${\mathrm{Se}}_{1}$, Ta${\mathrm{S}}_{1}$${\mathrm{Se}}_{1}$-(pyridine), Ta${\mathrm{S}}_{1.2}$${\mathrm{Se}}_{0.8}$, and Ta${…
Abstract Three protein kinases were separated from bovine epididymal spermatozoa by using DEAE-Sephadex ion exchange chromatography and Sephadex G-100 gel filtration. The molecular weights of these three kinases were estimated to be 120,000, 78,000 and 56,000 by the use of Sephadex G-100 gel filtration. The activity o…
Dislocation lines with variable Burgers vectors can exist in glasses and there is now experimental evidence for this, especially in metallic glasses. The kinematics and dynamics of their motion is discussed. It is suggested that dilatance at the core of a moving dislocation determines the viscous drag that acts on it…
The n-particle space of a configuration interaction (CI) calculation, spanned by configuration state functions (CSF's), is partitioned into subspaces defined, relative to a set of zeroth-order CSF's, by the type of orbital excitation and by the lowest order of the Rayleigh-Schrödinger perturbative correction contribut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of particle growth. I. Ammonium nitrate from the ammonia-ozone reactionR. G. De Pena, Kenneth Olszyna, and Julian HeicklenCite this: J. Phys. Chem. 1973, 77, 4, 438–443Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of rhenium(IV) chloride. II. Structure of one of the polymorps (.beta.) and evidence for a new polymorph (.gamma.)F. A. Cotton, B. G. DeBoer, and Z. MesterCite this: J. Am. Chem. Soc. 1973, 95, 4, 1159–1163Publication Date (Print):February 1, 1973Publication Histor…
A simple technique for determining the approximate flash point temperature of a compound, knowing only its atomic composition and boiling point, has been developed from experimental data and some theoretical considerations.
The growth behavior, time of nucleation, and morphology of Ca(OH) 2 crystals formed during the hydration of Ca 3 SiO 5 , at 15°, 25°, and 35°C at water‐solid ratios ( w/s ) from 0.3 to 5.0 were studied by optical microscopy. In samples with w/s >0.5 growth of Ca(OH) 2 in the c ‐axis direction is initially dominant.…
Two specific examples of the application to computer memories of order-disorder transitions in amorphous semiconductors are discussed. The particular physical changes utilized and accompanying the order-disorder transition are a resistance change and an optical change. The resistance change is applied to an electrical…
Abstract The gene encoding threonine synthetase has been located by genetic transformation in Bacillus subtilis. Its position is adjacent and central to the genes encoding homoserine dehydrogenase and homoserine kinase. Its mutational sites are closely linked to, and interspersed among, several mutational sites affect…
Results of an extensive experimental program on the ablation of ATJ graphite in air at surface pressures of 0.3 to 4.4 atm and surface temperatures of 2570 to 4030 K are presented. The measured mass-loss rates are correlated with surface temperature, pressure, and effective nose radius. The results are compared with s…
Abstract The effect of water on the low‐frequency (10 2 ‐10 5 H z ) complex permittivitv of native, sold‐state collagen has been investigated experimentally. Measurements at ambient temperature show that dry collagen exhibits essentially no frequency or temperature dependence. As water is absorbed, both dielectric con…
The emission spectra of phthalocyanine single crystals and evaporated films were investigated in the near infrared. In a H 2 Pc single crystal, several fluorescence peaks were observed between 760 mµ∼1 µ. In a CuPu single crystal, one phosphorescence band with fine structures was observed at 1.12 µ. However, no fluore…