The Audouinella (Acrochaetium-Rhodochorton) complex (Rhodophyta): present perspectives
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The binding of tyrosine and NAD+ to chorismate mutase/prephenate dehydrogenase from Escherichia coli K12 and the effects of these ligands on the activity and self-association of the enzyme. Analysis in terms of a model.
In the presence of NAD', tyrosine inhibits both activities of the bifunctional enzyme chorismate mutase/ prephenate dehydrogenase (EC 5.4.99.5/1.3.1.12).The maximal inhibition in the presence of 0.5 m~ NAD' and 0.15 l z l ~ concentration of the other substrate was 45% and 95% for the chorismate mutase and prephenate d…
A Simple theoretical model for calculating and parameterizing the ionospheric photoelectron flux
We have developed a simple method for calculating the ionospheric photoelectron flux that uses the concept of average electron energy loss to simplify the calculation of the degraded electron spectrum. This method, which requires only a knowledge of the total inelastic electron impact cross sections, rather than a det…
Modification of electric field at the solid insulator–vacuum interface arising from surface charges on the solid insulator
The surface of a solid insulator in vacuum (and in a high gas pressure) becomes electrically charged when subjected to a high voltage stress. The surface charge density is proportional to the applied voltage. The magnitude of the surface charge density depends on the secondary electron emission characteristic, the geo…
Production of antibacterial activities by two Bacillariophyceae grown in dialysis culture
Using a dialysis culture system for marine algae which allows for the recovery of high cell yield, we detected in the aqueous phase of the algal extracts an active component which inhibited gram-negative bacteria. Results show a direct relation between cell growth phase at time of harvest and the activity observed. It…
X‐ray studies on crystalline complexes involving amino acids and peptides
L-Arginine acetate crystallizes in the monoclinic space group P2(1) with a = 9.229(2), b = 5.178(3), c = 13.271(4) A and beta = 111.4(1) degrees. The crystal structure was solved by direct methods and refined to an R value of 0.058 for 1333 observed reflections. The conformation of the arginine molecules in the crysta…
Diffraction of a two-dimensional electromagnetic beam wave by a thick slit pierced in a perfectly conducting screen
Diffraction of a two-dimensional electromagnetic beam wave by a thick slit pierced in a perfectly conducting screen is studied, based on Maxwell’s equations and their associated boundary conditions. The incident field is not a plane wave but a more-realistic beam. Special attention is devoted to the numerical aspect,…
Unified treatment of structural effects in fluid‐solid reactions
Abstract By considering reaction and diffusion through a product layer and concomitant movement of pore and reaction surfaces, a general rate equation is derived for fluid‐solid reactions. Application to the random pore model extends the prior results (Bhatia and Perlmutter, 1980, 1981a) to account for nonlinear conce…
Vibrational frequencies for silaacetylene and its silylidene and vinylidene isomers
The molecular structures, vibrational frequencies, and relative energies of silaacetylene and its vinylidene and silylidene isomers have been investigated via nonempirical molecular electronic theoretical methods.Basis sets of double zeta (DZ) and double zeta (DZ) and double zeta plus d function quality have been usea…
Effective surfaces of semiconductor catalysts for light-induced heterogeneous reactions evaluated by simultaneous photodeposition of both oxidation and reduction products
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffective surfaces of semiconductor catalysts for light-induced heterogeneous reactions evaluated by simultaneous photodeposition of both oxidation and reduction productsTetsuhiko Kobayashi, Yoshikuni Taniguchi, Hiroshi Yoneyama, and Hideo TamuraCite this: J. Phys. Chem. 198…
Compatibility of ethylene-vinyl acetate copolymers with chlorinated polyethylenes. 1. Compatibility and its variation with temperature
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibility of ethylene-vinyl acetate copolymers with chlorinated polyethylenes. 1. Compatibility and its variation with temperatureD. J. Walsh, Julia S. Higgins, and S. RostamiCite this: Macromolecules 1983, 16, 3, 388–391Publication Date (Print):March 1, 1983Publication…
Pericyclic reactions of vinylallenes: from calciferols to retinoids and drimanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPericyclic reactions of vinylallenes: from calciferols to retinoids and drimanesWilliam H. OkamuraCite this: Acc. Chem. Res. 1983, 16, 3, 81–88Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983https://pubs.acs.o…
Dielectric properties and polaronic conductivity of WO3 and W x Mo1−x O3
An investigation of the Debye relaxations in WO3 and W x MO1−x O3 confirm the mechanism of polaronic conduction at low temperatures. The Mo positions act as trapping centres, and the relaxation times and activation energies depend largely on the crystallinity of the samples, Polarons are spin-paired in the ground stat…
The Essential Role of Diaminopimelate Dehydrogenase in the Biosynthesis of Lysine by Bacillus sphaericus
Extracts of Bacillus sphaericus NCTC 9602 catalysed the formation of meso-diaminopimelate from aspartic β-semialdehyde plus pyruvate, or from dihydrodipicolinate, even though no activities of tetrahydrodipicolinate acetylase (or succinylase) nor N-acetyl-(or N-succinyl-)ll-diaminopimelate deacylase nor diaminopimelate…
Crescent-shaped dinuclear complexes: a dirhodium(II) complex of the new tetradentate ligand 2,7-bis(2-pyridyl)-1,8-naphthyridine (bpnp), [Rh2(bpnp)(.mu.-CH3CO2)3](PF6)
ADVERTISEMENT RETURN TO ISSUEPREVArticleCrescent-shaped dinuclear complexes: a dirhodium(II) complex of the new tetradentate ligand 2,7-bis(2-pyridyl)-1,8-naphthyridine (bpnp), [Rh2(bpnp)(.mu.-CH3CO2)3](PF6)Wayne R. Tikkanen, E. Binamira-Soriaga, William C. Kaska, and Peter C. FordCite this: Inorg. Chem. 1983, 22, 7,…
On the Compression Characteristics of Fibre Masses
(1983). On the Compression Characteristics of Fibre Masses. The Journal of The Textile Institute: Vol. 74, No. 2, pp. 92-97.
Rheological behavior of highly filled polymer melts
Abstract The rheological behavior of highly filled polymer melts has been examined. At concentrations near the maximum packing fraction, strain‐dependent behavior was observed at strains as low as 1 percent. Selected surface treatments were shown to reduce particle agglomeration. This produced composite melts with low…
Magnetic field and magnetic isotope effects on photoinduced emulsion polymerization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic field and magnetic isotope effects on photoinduced emulsion polymerizationNicholas J. Turro, Ming Fea Chow, Chao Jen Chung, and Chen Ho TungCite this: J. Am. Chem. Soc. 1983, 105, 6, 1572–1577Publication Date (Print):March 1, 1983Publication History Published online…
Hydrodynamic stability of the melt during solidification of a binary alloy
The equations governing melt stability during solidification of a binary alloy are shown to resemble those characterizing the Bénard problem with permeable boundaries. Critical conditions for the onset of stationary convection are calculated for the case of a planar interface. Long wavelength modes are preferred when…
Semiconducting properties of V2O5 gels
Mixed-valence vanadium pentoxide gels have been obtained by polymerization of vanadic acid. They exhibit semiconducting properties which arise from electron hopping between VIV and Vv ions. Such gels can easily be deposited onto a substrate, giving layers of high electrical conductivity (σ =0.l Ω−1 cm−1 at 300 K). The…