Materials Literature
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The presence of only one thiolase (EC 2.3.1.9) in wild-type Escherichia coli induced for enzymes of beta oxidation was demonstrated. A different thiolase was shown to be present in a mutant constitutive for the enzymes of butyrate degradation. The two thiolases were purified to near homogeneity by a simple two-step pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.sigma.- vs. .pi.-Bonded organoactinides. Synthesis and structural analysis of tris(.eta.5-cyclopentadienyl)-.eta.1-2-methylallyluranium(IV)Gordon W. Halstead, Edgar C. Baker, and Kenneth N. RaymondCite this: J. Am. Chem. Soc. 1975, 97, 11, 3049–3052Publication Date (Print):…
Periodic structures indicating discontinuous growth of shell wall plates have been observed in thin sections of shell and on the outer surface of shell plates of many species of operculate (Bourget, 1975). When sectioned and etched the shell plates appear to be composed of successive thin layers of shell material, eac…
The energy bands of the compound Cr${\mathrm{B}}_{2}$ have been calculated by using the Korringa-Kohn-Rostoker method in the muffin-tin-potential approximation. The bands near the Fermi level have mostly Cr $d$ character, and one of the bands gives rise to a very flat piece of Fermi surface perpendicular to the hexago…
The purpose of this paper is to inform experimenters of what can be done to predict from the Electromagnetic Theory the properties of gratings when their profile and the indices of the materials making them up are known. Four broad methods are discussed: analytic, semi-analytic, integral and differential methods.
Multiple forms of 7-alpha-hydroxysteroid dehydrogenase were detected in six of nine strains of Bacteroides fragilis. The enzymes differed with respect to pyridine nucleotide specificity, thermal stability, divalent metal cation requirement, and elution profilies from Sephadex G-200 columns. The nicotinamide adenine di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of silica supported chromium ions. III. Two-ligand complexes. Nitric oxide adsorptionA. Zecchina, E. Garrone, C. Morterra, and S. ColucciaCite this: J. Phys. Chem. 1975, 79, 10, 978–983Publication Date (Print):May 1, 1975Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance spectroscopy. XIII. Amidines. VII. Proton and carbon-13 nuclear magnetic resonance studies on the tautomerism, geometrical isomerism, and conformation of some cyclic amidines, guanidines, and related systemsLloyd M. Jackman and Timothy JenCite this…
Abstract The transport behavior of O 2 and N 2 were studied for series of physical blends of PVC with EVA having different vinyl acetate (VAc) contents in the EVA (45 and 65 wt‐%) and using different milling temperatures (160° and 185°C). The polymer blends were further characterized by dynamic mechanical measurements…
Pyridoxamine (pyridoxine) 5'-phosphate oxidase (EC 1.4.3.5) has been purified 2000-fold from rabbit liver. The enzyme preparation migrates as a single protein and activity band on analytical disc gels containing 4,7, or 9 percent acrylamide, and as a single protein band on sodium dodecyl sulfate acrylamide gels. The o…
Collagen has been prepared from steer glomerular basement membrane by controlled pepsin solubilization. Four collagen polypeptides of potential alpha chain size have been isolated following denaturation and reduction with mercaptoethanol. Purification was obtained through sequential chromatography by gel filtration on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimple cell model treatment of surface tension expansionY. TamaiCite this: J. Phys. Chem. 1975, 79, 10, 965Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https://pubs.acs.org/doi/10.1021/j100577a004https://doi.or…
Abstract Neutral to alkaline soils from several climatic and physiographic locations were studied. The clay mineralogy of these soils was characterized by interstratified mixtures of mica, montmorillonite and little vermiculite. X‐ray diffraction patterns for the most abundant clay fraction, < 0.2 µm, were composed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved Capillary Method for Diffusivity MeasurementsC. Y. Luk, L. Nanis, and M. LittCite this: Ind. Eng. Chem. Fundamen. 1975, 14, 2, 92–95Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https://pubs.acs.org/doi…
Charging effect induced by an analyzing electron beam of a SEM has been observed on the cleaved surface of a silicon wafer. It was ensured that this is due to the formation of an oxide layer on the silicon surface. Using this effect, two new applications of the electron-beam-induced-current (EBIC) mode are performed.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotally symmetric metal-nitrogen stretching vibrations of ethylenediamine chelate complexesC. D. Flint and A. P. MatthewsCite this: Inorg. Chem. 1975, 14, 5, 1219–1220Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 19…
Abstract The influence of chemical groups regularly spaced along a polymer chain on structure and behaviour of chain folded single crystals was studied on linear aliphatic polyesters with different lengths of repeating unit. Poly(oxytetramethyleneoxysebacoyl) (or polyester 4,10), poly(oxyhexamethyleneoxysebacoyl) (or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Dynamics of Block-Copolymer Molecules in Solution. The Free-Draining LimitF. W. Wang and E. A. DiMarzioCite this: Macromolecules 1975, 8, 3, 356–360Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https://pubs.…
This study reports on measurements with multiple techniques delineating the complete sequence of events from the corona streamer to the arc phase in the spark transition for large rod-to-plane air gaps applied by positive switching impulses. Observations with a image converter camera, photomultipliers, a Boys camera,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of organic sulfides from aromatic concentrates by ligand exchange chromatographyJames W. Vogh and James E. DooleyCite this: Anal. Chem. 1975, 47, 6, 816–821Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 19…