Materials Literature
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In the envelope of Escherichia coli, is a lipoprotein of molecular weight 7,200 as a major envelope protein. This lipoprotein was previously shown to exist in two different forms in the outer membrane of E. coli: the free form and the boundform, which is covalently linked to the peptidoglycau. The free form of the lip…
The fluorescence spectrum of KY3F10: 1% Eu in powder form was recorded at 77 and 4.2°K between 4600 and 7000 Å, and 89 fluorescence lines arising from levels 5D0, 5D1, 5D2, and probably 5D3 were observed. The spectrum agrees with with a C4v symmetry, and it is possible to determine the irreducible representation of th…
A theory is developed for spin-lattice relaxation in the nematic phase which includes both local and collective motion. It is found that the frequency dependence of the relaxation rate ${T}_{1}^{\ensuremath{-}1}$ depends on the correlation time for the motion at the local molecular level, ${\ensuremath{\tau}}_{c}$. Wh…
Measurements of low-temperature specific heats (2-37 K) are reported for the first time on some common paraelectrics (thallous halides, Pb${\mathrm{F}}_{2}$, KTa${\mathrm{O}}_{3}$), ferroelectrics [BaTi${\mathrm{O}}_{3}$, potassium dihydrogen phosphate or KDP, triglycine sulfate or TGS, LiNb${\mathrm{O}}_{3}$, LiTa${\…
The oxidation properties of GaAs(110), GaSb(110), and InP(110) have been studied with the photoemission technique using synchrotron radiation. One part of the work consisted of an investigation of the chemical shifts in the core levels upon adsorption of oxygen in submonolayer quantities. For GaAs and InP, oxygen remo…
Jute fiber properties commonly determined are strength and fineness. The relationship of these fiber properties with the various yarn-strength parameters are discussed. Though fiber bundle strength is closely associated with yarn tenacity, it does not explain satisfactorily the variation in yarn quality. Fineness meas…
The action of chloranil in boiling methanol on 2,7-bis(dimethylamino)-9,l0-dihydroanthracene (5)produces 2,2',7,7'-tetrakis(dimethylamino)-9,9'-bianthracene (6b); dehydrogenation of (5) with palladium-on-carbon in toluene gives 2,7-bis(dimethy1amino)anthracene (1).
This paper deals with the identification of certain species produced during the corrosion of iron in oxygen-containing and oxygen-free solutions. Iron was allowed to corrode in acid solutions of constant pH of NaBr, NaCl, Nal, NaNO3, Na2HPO4, Na2SO4, and NaClO4. These reactions were conducted in (1) air-saturated solu…
The magnetic structure of Mn(Nb0.5Ta0.5)2O6 with columbite structure was determined by means of neutron diffraction using single-crystal data. The intensities were gained by means of a small cold Eulerian cradle. The evaluation leads to a canted magnetic structure GxAz (G: S1 = - S2 = S3 = - S4; A: S1 = - S2 = - S3 =…
Abstract Recent years have seen the development of several physical methods for the study of solid surfaces under ultrahigh vacuum conditions, of which the most important are discussed in this progress report. Contemporary views of the chemisorption bond and the factors affecting it are discussed against the backgroun…
Critical pitting potential and protection potentials were measured potentiodynamically in 0.1N NaCl solution vibrated by a 200 kHz ultrasonic wave. The critical pitting potential was more noble in this environment than in a hydrostatic solution. This fact was confirmed potentiostatically. In hydrostatic solution, the…
Six ethionine-resistant (Etr) regulatory mutants of Saccharomycopsis lipolytica Sl/1 overproducing methionine have been isolated. Five of them are also resistant to seleno-methionine. The activity of homocysteine synthase (O-acetyl-L-hormoserine-acetate lyase, adding hydrogen sulfide) is derepressed in these mutants a…
Results of 16-year tests of metals in tropical sea water total and intermittent immersion and atmospheres are reported. Data are tabulated on carbon and low-alloy steels, alpha and beta brasses, bronzes, NiCu and CuNi, austenitic stainless steels, and commercially pure Al, Cu, Ni, Pb, and Zn, both as single metals and…
Liquid crystals represent states of matter that are intermediate between the crystalline solid and the amorphous liquid. There has been a considerable growth of interest in these mesomorphic states in recent years, partly because of their important applications in display technology. This review article deals with the…
Fine structure, density, and some mechanical properties have been studied in jute fiber dried differently after retting. It is observed that the fiber has a less compact structure before under-going any drying processes after retting. Formation of hydrogen bonding during subsequent drying seems to be the cause of subs…
Abstract The effect of annealing on the microstructure of commercial grade poly(vinyl chloride) was investigated by calorimetric, X‐ray and viscoelastic measurements. The degree of crystallinity increases with increasing annealing temperature from above the glass transition temperature up to 130°C, at which point the…
Abstract Es wird über Neutronenbeugungsstrukturanalysen an den Kristallpulvern von Verbindungen Ba 2 CuWO 6 und Sr 2 CuB VI O 6 (B VI : W, Te) sowie zweier mit Zn 2+ auf der Cu 2+ ‐Position verdünnter Mischkristalle berichtet, die in Jahn‐Teller‐verzerrten Varianten des Elpasolith‐Typs kristallisieren. Die CuO 6 ‐Okta…
This paper describes a model of relaxed plain weft-knitting and, by consideration of the forces acting between loops, both in the interlacing region and at possible course- and wale-jamming points, derives equations whose numerical solution gives the loop shape, fabric dimensions, and magnitudes of the forces and coup…
Details of the electronic bands near the Si–SiO2 interface were examined by the technique of determining the field dependence of the threshold Φ (ε) for internal photoemission. From a measurement of Φ (ε), the conduction band bottom φ (x) in the SiO2 was obtained to within approximately two lattice units of the interf…
The conductive properties of carbon black filled polymers have already found many qualitative applications while quantitative ones remain infrequent because of the number of unexpected parameters which influence the conductance of samples of the material. We have tried to connect the anomalous electrical behaviour of…