Regulation of Aspartokinase in Bacillus subtilis
L-threonine and L-lysine
Materials Literature
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Photochemistry and oxidation-reduction reactions of tin porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry and oxidation-reduction reactions of tin porphyrinsDavid G. Whitten, Joseph C. N. Yau, and F. A. CarrollCite this: J. Am. Chem. Soc. 1971, 93, 9, 2291–2296Publication Date (Print):May 1, 1971Publication History Published online1 May 2002Published inissue 1 May…
Electronic Studies of KH2PO4
The results of electrocaloric studies of the electrical equation of state of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ in the temperature region within 1 K of the ferroelectric transition are reported. Chief emphasis is given to determination of the spontaneous polarization. A discontinuous polarization jump of 1.87 \ifm…
The Adsorption of Water on SiO2, Al2O3, and SiO2·Al2O3. The Relation between the Amounts of Physisorbed and Chemisorbed Water
Abstract The specific surface area, the water content, and the water adsorption isotherm have been measured in order to investigate the interaction between the surfaces of SiO2, Al2O3, and SiO2·Al2O3 and water molecules. Al2O3 gives II-type adsorption isotherms and the amount of adsorbed water on it increases with a r…
Viscosity Measurements by Quasi Elastic Light Scattering in p-Azoxyanisol
We discuss some difficulties inherent to the light scattering measurement of the viscosity coefficients in paraazoxyanisol. In contrast with a previous report, we present a unique set for these quantities, in reasonable agreement with the conventional determination by Miesowicz.
Angular and Energy Distribution of Cross Sections for Electron Production by 50-300-keV-Proton Impacts onN2,O2, Ne, and Ar
Cross sections differential in angle and ejection energy for electron production by proton impact on nitrogen, oxygen, neon, and argon have been measured using electrostatic analysis and counting of individual electrons. The range of proton energies was 50-300 keV, the angles ranged from 10\ifmmode^\circ\else\textdegr…
Mixing and product distribution for a liquid‐phase, second‐order, competitive‐consecutive reaction
Abstract Mixing effects for the homogeneous, liquid‐phase, second‐order, competitive‐consecutive reaction of iodine ( B ) with L‐tyrosine ( A ) to form 3‐iodo‐L‐tyrosine ( R ) and 3,5‐diiodo‐L‐tyrosine ( S ) were determined for the following conditions: vessel volume, 5 and 36 liters (baffled and unbaffled); turbine d…
Origin of Memory Effect in Cu-Al-Ni Alloy
The origin of the memory effect in Cu–14.2Al–4.3Ni (W/O) alloy has been investigated using the techniques of optical microscopy and electron microscopy. As a result the following have been established. The plastic deformation is caused by the growth or creation, and the contraction or disappearance of twins inside mar…
A Wien Filter for Use as an Energy Analyzer with an Electron Microscope
An electron optical system is described which is suitable for energy loss analysis in an electron microscope. A focusing spectrometer of the Wien type has been added underneath the column of a Hitachi HU11A electron microscope. After passing through the microscope, the electrons are slowed down before entering the spe…
A Low Temperature Glass-Ceramic Capacitance Thermometer
Dielectric measurements are reported on capacitance thermometers based on SrTiO3 crystallized from glass at 1100 and 1200°C. Multilayer experimental units, approximately 5×2×1 mm, were fabricated using pilot plant facilities and measured from 1.7 to 300 K. If both the capacitance and loss tangent are measured, the ran…
Theory of Translational and Orientational Melting with Application to Liquid Crystals
A theory of melting with application to liquid crystals in which both translational and orientational order parameters are taken into account is developed in a manner similar to that of Kirkwood and Monroe.
Effect of Neutron Irradiation on Mechanical Properties of Al-Li Alloys
An increase in yield stress at room temperature was observed in Al-0.6W/0 Li alloy irradiated to thermal neutron doses of 2.9 × 1019 to 7.2 × 1019 cm−2. The hardening of as-irradiated specimens is accompanied with yield point followed by jerky yield-elongation in the stress-strain curve. The radiation hardening could…
Dielectric function for alkali halide crystals
Abstract The wave‐vector dependent dielectric function for LiCl, LiBr, LiI, NaCl, NaBr, Nal, KCl, KBr, and KI is calculated using a model originally proposed by Fry. An approximate analytical expression for the screened Coulomb potential is also given.
Phase transitions in ordered barium-rare earth-molybdenum perovskites
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase transitions in ordered barium-rare earth-molybdenum perovskitesHugo Steinfink and C. D. BrandleCite this: Inorg. Chem. 1971, 10, 5, 922–926Publication Date (Print):May 1, 1971Publication History Published online1 May 2002Published inissue 1 May 1971https://pubs.acs.org…
Conduction band of IVa and Va subgroup transition metal monocarbides (II)
Abstract Results are presented of a study of the Hall effect (in the low‐temperature range 20 to 300 °K) and of the thermopower of the monocarbides VC x , NbC x , and TaC x within the limits of their homogeneity regions. Basing on the experimental results obtained and on earlier data on magnetic susceptibility and ele…
Poly(ethylene sulfide). II. Thermal degradation and stabilization
Abstract High molecular weight poly(ethylene sulfide) undergoes severe thermal degradation at the high temperatures (220–260°C) required for processing in injection‐molding equipment. Thermal degradation of the polymer is accompanied by gas evolution and a decrease in melt viscosity. Stabilization of poly(ethylene sul…
Influence of Irradiation Temperature on the Creep-Rupture Properties of Hastelloy-N
The variation of the postirradiation creep-rupture properties with irradiation temperature has been evaluated for air- and vacuum-melted Hastelloy-N.The air-melted material was high in silicon and ...
Organometallic Polymers. XI. Copolymerization of 2-Ferrocenylethyl Acrylate and Methacrylate with Styrene, Vinyl Acetate, Methyl Acrylate, and Methyl Methacrylate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic Polymers. XI. Copolymerization of 2-Ferrocenylethyl Acrylate and Methacrylate with Styrene, Vinyl Acetate, Methyl Acrylate, and Methyl MethacrylateCharles U. Pittman Jr., Robert L. Voges, and William B. JonesCite this: Macromolecules 1971, 4, 3, 298–302Publica…
Large deformation, deep penetration theory for a compressible strain-hardening target material
1 lorillo, A. J., Damping Dynamics of Axisymmetric Rotor Stabilized Satellites, ASME Winter Meeting, Chicago, 111., Nov. 1959. 2 Likins, P. W., Criteria for Dual Spin Journal of Spacecraft and Rockets, Vol. 4, No. 12, Dec. 1967, pp. 1638-1643. 3 Mingori, D. L., Effects of Energy Dissipation on the Attitude of Dual-Spi…
Thermal Decomposition of Oxalates of Ammonium and Potassium
The thermal decomposition of oxalates of ammonium and potassium was studied by simultaneous TGA, DTA, and EGA (effluent gas analysis). Of the simple oxalates, the potassium compound is more stable than the lithium compound, as has been observed for the corresponding carbonates and sulfates. Ammonium oxalate is much le…