Materials Literature
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This paper surveys quantum effects in diffusion, with special emphasis on isotope effects for hydrogen isotopes in metals. The various possible contributions to the isotope effect are surveyed, and their importance assessed. The bcc metals (V, Nb, Ta) and fee metals (Cu, Ni, Pd) involve different mechanisms, and these…
Abstract The single‐strand helix‐coil transition in various oligo‐ and polyadenylates is characterized by means of an improved cable temperature‐jump technique. In all the polymers studied {poly(rA), poly(dA), poly[A(m2′)] and poly[A(e2′)]} helix‐coil relaxation is observed in the time range from 30 to 1000 nsec. Rela…
Abstract An energy-dispersive X-ray diffractometer using a solid-state detector is constructed for the determination of the liquid structure. It has two merits over the usual angle-dispersive diffractometer, i.e., a higher resolution of the s-value and a wider measurable s-region. The procedure of the data analysis an…
Thermal depolarization current (TDC) of polypyromellitimide film was measured in order to obtain knowledge of the charging and discharging mechanisms of carriers in polypyromellitimide. Two peaks are observed at 173 (α) and 50 °C (β) in the dried film. The β peak attributed to dipole orientation polarization is probab…
The heat capacities of glasses near the feldspar compositions KAlSisO8, NaAlSiaOs, and CaAlzSizOr, and of crystalline anorthite were measured between | 2 and 380 K by means of an adiabatic calorimeter. Difference plots, C!(glass) - C!(crystals), show pronounced maxima at 30 K for KAlSisOs, at 50 K for NaAlSirOr, and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure and reactivity of hydridoiron tetracarbonyl anion, [HFe(CO)4]-M. Y. Darensbourg, D. J. Darensbourg, and H. L. C. BarrosCite this: Inorg. Chem. 1978, 17, 2, 297–301Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Publis…
It has been postulated that phenol-containing areas of plant and animal tissues were osmiophilic, but proof of direct interaction between osmium tetroxide and phenolic materials, or the nature of such reactions, has been lacking. We find that, under conditions similar to those of normal tissue fixation, osmium tetroxi…
Poly-beta-hydroxybutyrate (PHB) is a uniquely procaryotic endogenous storage polymer whose metabolism has been shown to reflect environmental perturbations in laboratory monocultures. When hydrolyzed for 45 min in 5% sodium hypochlorite, PHB can be isolated from estuarine detrital microflora in high yield and purified…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPresence of a static Jahn-Teller distortion in copper(II) terpyridine complexes. 1. Crystal structure of diterpyridinecopper(II) nitrateR. Allmann, W. Henke, and D. ReinenCite this: Inorg. Chem. 1978, 17, 2, 378–382Publication Date (Print):February 1, 1978Publication History…
Formate dehydrogenase (EC 1.2.1.2) from Pseudomonas oxalaticus has been isolated and characterized. The enzyme (molecular weight 315000) is a complex flavoprotein containing 2 FMN, 18--25 non-heme iron atoms and 15--20 acid-labile sulphides. In the last step of the purification, a sucrose gradient centrifugation, a se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition-metal dimers. 12. Structural and magnetic characterization of the di-.mu.(1,3)-azido complex [Cu2(Me5dien)2(N3)2](BPh4)2 and similar di-.+-.(1,3)-azido copper(II) dimers. Unusual zero-field splitting in the electron paramagnetic r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReducing fuel nitrogen oxides (NOx) emission: molecular nitrogen formation from fuel nitrogenSachio Sugiyama, Norio Arai, Masanobu Hasatani, Shinji Kawamura, Ichibei Kudou, and Naoyoshi MatsuhiroCite this: Environ. Sci. Technol. 1978, 12, 2, 175–180Publication Date (Print):F…
Abstract The behavior on thermal degradation of the sericin cocoon consisting of a sericin and a few fibroin has been examined by means of evolved gas analysis (EGA), evolved gas detection (EGD), and differential thermal analysis (DTA). The sericin cocoons produced from the silkworm (Nd, Nd‐s/Nd‐s,Nd‐s/+) and sericin…
Abstract Polymerization of 1,3‐dioxolane ( 1 ) was initiated in CH 3 NO 2 and CH 2 Cl 2 solvents with benzoylium hexafluoroantimonate (C 6 H 5 CO + SbF ), terminated with sodium ethanolate (C 2 H 5 ONa), and the endgroups were determined by using UV spectrophotometry and 1 H NMR methods. Polymers with high polymerizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen isotope effects in titanium alloy hydridesJohn Tanaka, R. H. Wiswall, and J. J. ReillyCite this: Inorg. Chem. 1978, 17, 2, 498–500Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Published inissue 1 February 1978https://pubs.acs…
The study attempts to develop a theory for the penetration of a wide range of solid materials by continuous high-velocity water jets. The theory is based on a control volume analysis to determine the hydrodynamic forces acting on the solid boundaries of the cutting slot. A Bingham model is used to describe the time-de…
This paper describes the application of the equivalent index method to the design of metal-dielectric thin-film optical coatings. It is shown that, provided some simple approximations are made, metal-dielectric periods can be treated in exactly the same way as all-dielectric periods. Illustrations of the application o…
Abstract Four sepiolite deposits of different origin, which occur near Las Vegas, Nevada, are compared and described. They include a playa deposit, a valley terrace deposit, and two types of vein deposits. The physical and chemical characteristics of the four materials are described, the engineering and commercial fea…
Measurements of magnetic susceptibility, thermal expansion and electrical resistivity were carried out at temperatures ranging from 77 K to room temperature on a polycrystalline sample of the antiferromagnetic compound MnSe with rock salt structure. The curves obtained show a large thermal hysteresis and a sharp trans…
Abstract A polybenzimidazole having the structural repeat unit magnified image and designated AB‐PBI was formed into films by casting or precipitating from dilute solutions. Selected films were swollen in a plasticizing medium arid drawn about 2X. All films were dried in a vacuum oven to aid in the removal of residual…