CRYSTALLINE BACTERIAL PROTEINASE
BUNJI HAGIHARA, HIROSHI MATSUBARA, MASASHI NAKAI, KAZUO OKUNUKI; CRYSTALLINE BACTERIAL PROTEINASE: I. PREPARATION OF CRYSTALLINE PROTEINASE OF BAC. SUBTILI
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Proton Magnetic Resonance of the CH3 Group. IV. Calculation of the Tunneling Frequency and of T1 in Solids
The thirty lowest eigenvalues of the Mathieu equation have been calculated numerically to nine places for a hindered rotor with threefold symmetry attached to a rigid framework. The results are tabulated for eight values of IV0/2ℏ2 ranging from 56.25 to 115.3125. The splittings of the torsional states of the CH3 group…
BAND STRUCTURE OF RHOMBOHEDRAL GRAPHITE
The band structure of rhombohedral graphite has been investigated using the nearest-neighbor tight-binding approximation. The resulting behavior of the π-bands near the Fermi surface is more complex than in the case of the Bernal stacking. The two π-bands still touch, but the touching points no longer lie on the edges…
Studies on the Chemistry of Halogen and of Polyhalides. XIII. Voltammetry of Iodine Species in Acetonitrile
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Chemistry of Halogen and of Polyhalides. XIII. Voltammetry of Iodine Species in AcetonitrileAlexander I. Popov and David H. GeskeCite this: J. Am. Chem. Soc. 1958, 80, 6, 1340–1352Publication Date (Print):March 1, 1958Publication History Published online1 May…
Entrapment of gas in the spreading of a liquid over a rough surface
Abstract Conditions for the incomplete displacement of gas from the valley between two parallel ridges by a liquid‐drop front advancing over the ridges are calculated. The significant parameters are found to be the liquid density, surface tension, contact angle, and geometry of the ridges. The solution may be obtained…
Glass transition temperatures of copolymers
Abstract The Gordon‐Taylor equation relating the glass transition temperature θ of a copolymer to the glass transition temperatures θ 1 and θ 2 of the homopolymers is equivalent to where c 1 and c 2 are the weight fractions of the constituents and A 1 and A 2 are constants. It can be recast into the following forms su…
Calculation of the Energy Loss in Magnetic Sheet Materials Using a Domain Model
The energy loss resulting from eddy currents is calculated for magnetic sheet materials with a simple domain configuration. The domain model used is considered to be applicable for any induction up to saturation and for the frequency range up to that used in most electrical power applications. The eddy current losses…
Nature of the Glass Transition and the Glassy State
The thermodynamic properties of amorphous phases of linear molecular chains are obtained from statistical mechanics by means of a form of the quasi-lattice theory which allows for chain stiffness and the variation of volume with temperature. A second-order transition is predicted for these systems. This second-order t…
Preparation of Graphitic Oxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Graphitic OxideWilliam S. Hummers Jr. and Richard E. OffemanCite this: J. Am. Chem. Soc. 1958, 80, 6, 1339Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://pubs.acs.org/doi/10.1021/ja01539…
X-Ray Study of Deuteron-Irradiated Copper near 10°K
Precise measurements of lattice expansion of high-purity copper held near 10\ifmmode^\circ\else\textdegree\fi{}K during deuteron bombardment were made using a rotating single-crystal method. An expansion of (4.1\ifmmode\pm\else\textpm\fi{}0.2) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}21}$ per 7-Mev deute…
Electron Interaction in Solids. The Nature of the Elementary Excitations
Possible elementary excitations in solids are studied with the aid of the general theoretical approach developed in the preceding papers of this series. Particular attention is paid to the basic theoretical justification for the individual-particle-like elementary excitations ("effective" electrons). It is concluded t…
Dielectric Properties of Single Domain Crystals of BaTiO3at Microwave Frequencies
Small-signal dielectric constant measurements were made on single domain crystals of BaTi${\mathrm{O}}_{3}$ from 25\ifmmode^\circ\else\textdegree\fi{}C to 170\ifmmode^\circ\else\textdegree\fi{}C at 24 kMc/sec. A typical Curie behavior was observed with a dielectric constant ${\ensuremath{\epsilon}}_{11}$ of about half…
Clay Mineral Research at the Institute for Silicate Chemistry, Zagreb
Abstract Part of the research on the structure, synthesis, and properties of clay minerals in Yugoslavia is reviewed with particular reference to the following problems: (a) attempts to synthesize halloysite from solutions under normal conditions; (b) structure and properties of synthetic montmorillonites; (c) dehydro…
Linear polyesters derived from protocatechuic acid
Abstract Protocatechuic acid which is available from tree sources was converted to a hydroxymethyl‐1,4‐benzodioxan carboxylic acid by reaction with epichlorohydrin. This hydroxy acid was condensed by heating under vacuum to from a linear polyester which was converted to fibers by melt spinning. By applying stretch dur…
Nitrite Inhibition of Corrosion: Some Practical Cases
The general features of nitrite inhibition and the mechanism of its action, so far as known, are discussed. Particular cases of nitrite inhibition in hydraulic fluids, cutting fluids, storage fluids, fire-extinguishing plant, canned goods, automobile cooling systems and marine turbine systems are then reviewed. The ad…
ZIRCONIUM AND TITANIUM INHIBIT CORROSION AND MASS TRANSFER OF STEELS BY LIQUID HEAVY METALS
Zirconium and titanium inhibit solution mass transfer of steels by liquid bismnuth, mercury, and lead. It is shown that in bismuth and mercury, these adsorb on the surface of the steels and subsequently react with nitrogen and possibly carbon from the steels to form inert, adherent surface layers of ZrN, TiN, or TiN +…
7—STUDIES ON THE SORPTION OF MOISTURE BY POLYMERS PART III—CELLULOSE ACETATE AND CELLULOSE TRIACETATE FIBRES
The adsorption isotherms of water vapour on a wide range of commercial secondary cellulose acetate and cellulose triacetate fibres have been measured at 22°C. Conversion of cellulose acetate flake into fibres causes a drop in sorption, but otherwise the sorption is almost unaffected by the filament denier, conversion…
Die Temperaturabhängigkeit der Verzunderung von reinem Eisen in Sauerstoff
Neumessung der Konstanten bei der Verzunderung von Elektrolyteisen von 480 bis 1080° C in Sauerstoff bei Atmosphärendruck unter Verwendung eines Fallbügelreglers zur Vermeidung von Übertemperaturen. Vergleich der Ergebnisse mit Angaben aus dem Schrifttum. Bedeutung der Temperaturen von 566, 579, 616, 755 und 910° C fü…
Melting points and heats of fusion of some polyamides and polyesters
Abstract Melting points of three polyamides, four polyesters, and their mixtures with diluents have been determined by application of dilatometry to observe the latent volume change during gradual melting extending over many days in each case. Heats of fusion were calculated from the depressions of the melting point b…
Arrangements of Dislocations in Plastically Bent Silicon Crystals
Dislocations introduced into single crystals of silicon by plastic bending at an elevated temperature have been studied quantitatively by the etch-pit technique. The average etch-pit density after deformation is approximately two to three times higher than the calculated dislocation density. Prolonged annealing of the…