A Deoxyribonucleic Acid Polymerase I-deficient Mutant of Bacillus subtilis
A methyl methanesulfonate sensitive mutant
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High‐pressure phase of polytetrafluoroethylene
Abstract The effect of hydrostatic pressure on the crystal structure of PTFE has been studied up to pressures of ca. 25 kbar by x‐ray diffraction. The experimental method uses opposed diamond anvils of small surface area as transmitters of pressure with MoKα x‐radiation propagating through these anvils. A small specim…
Kinetic investigation of the synthesis of a polyethersulphone
Abstract This paper summarises results obtained from a kinetic investigation of the processes occuring during the synthesis of polyethersulphones by reactions such as: magnified image The factors determining the variations in functional group reactivities due to ‘bridge’ effects are described with reference to the rea…
The effects of elastic anisotropy on dislocation line tension in metals
Formulae for the energy, its first derivative with respect to orientation and the line tension of straight dislocations in elastic media of arbitrary anisotropy are developed. The formulae may be evaluated rapidly and precisely by numerical integration, thus avoiding the need for solving a sextic algebraic equation co…
Critical Review of Synthesis and Occurrence of Plagioclase Feldspars and a Possible Phase Diagram
Attainment of equilibrium in plagioclase feldspars is severely hampered by the charge linkage between Ca and Al on the one hand and Na and Si on the other hand (Goldsmith): exsolution is governed therefore by the activation energy for migration of tetrahedrally bonded atoms. Fine-scale intergrowths with structural con…
Factors Affecting the Interactions of Collagen Molecules as Observed by in Vitro Fibril Formation
Mono, di-, and tri-saccharides were found to inhibit collagen fibril formation in vitro without denaturing collagen molecules. Polyalcohols such as ethylene glycol, glycerol, and mannitol also inhibited the fibril formation at higher concentrations than those of sugars. Urea and dioxane also inhibited the fibril forma…
Electron paramagnetic resonance study of copper(II)-ammonia complexes in Y-type zeolites
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance study of copper(II)-ammonia complexes in Y-type zeolitesE. F. Vansant and J. H. LunsfordCite this: J. Phys. Chem. 1972, 76, 20, 2860–2865Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue…
Magnetic properties of grain-oriented silicon steel with high permeability Orientcore HI-B
Grain-oriented silicon steel with a high degree of
Elastic Constants and Soft Optical Modes in Gadolinium Molybdate
The complete set of elastic constants in single-crystal gadolinium molybdate (GMO) is presented in a temperature range from 20 to 200 \ifmmode^\circ\else\textdegree\fi{}C. This covers the structural phase transition at 159 \ifmmode^\circ\else\textdegree\fi{}C, below which GMO is both ferroelastic and ferroelectric. El…
Thermal stability of thin PtSi films on silicon substrates
The thermal stability of PtSi is an important parameter in large-scale integration processing schemes which involve postmetallization high-temperature operations. For this reason, the effect of annealing on various properties of PtSi has been studied over the temperature range 800–900°C, for 200- and 900-Å-thick PtSi…
Effect of Proton-Phonon Coupling on the Ferroelectric Mode in KH2PO4
The low-frequency Raman spectra of crystal K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ are reexamined experimentally. For temperatures above the Curie point, the ${B}_{2}$ spectra below 270 ${\mathrm{cm}}^{\ensuremath{-}1}$ are fitted to the model of two coupled harmonic oscillators. When the proton-phonon-coupling effect…
The plasma polymerization of vinyl monomers. II. A detailed study of the plasma polymerization of styrene
Abstract A study has been made on the plasma polymerization of styrene monomer in a cold, low‐power, inductively coupled RF plasma. Styrene monomer yielded an insoluble, crosslinked film which was slightly colored. A kinetic study is reported for styrene. The effects of power level, bleed rate of monomer, pressure, an…
Angular Distribution of Electrons Elastically Scattered fromN2
The angular distribution of electrons elastically scattered from ${\mathrm{N}}_{2}$ as a function of energy has been measured utilizing a crossed-beam technique. Measurements have been made of monoenergetic electrons with energies between 5 and 90 eV scattered from a collimated beam of ${\mathrm{N}}_{2}$ at angles fro…
Carbon-13 Observations of the Nature of the Short-Chain Branches in Low-Density Polyethylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 Observations of the Nature of the Short-Chain Branches in Low-Density PolyethyleneD. E. Dorman, E. P. Otocka, and F. A. BoveyCite this: Macromolecules 1972, 5, 5, 574–577Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Publish…
Magnetic exchange in transition metal complexes. VIII. Molecular field theory of intercluster interactions in transition metal cluster complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in transition metal complexes. VIII. Molecular field theory of intercluster interactions in transition metal cluster complexesA. P. Ginsberg and M. E. LinesCite this: Inorg. Chem. 1972, 11, 9, 2289–2290Publication Date (Print):September 1, 1972Publication H…
Neutron-Scattering Study of the Ferroelectric Phase Transformation inTb2(MoO4)3
We establish a first example of a ferroelectric phase transformation where a Brillouin-zone-boundary soft mode [at the $M$ point (\textonehalf{}\textonehalf{},0)] rather than a Brillouin-zone-center mode of the parent paraelectric phase (PE) is responsible for the transition. By inelastic scattering of neutrons, we ha…
Synergistic catalysis of ammonium nitrate decomposition. Visible spectra of ammine, chloro, and nitrato complexes of copper, nickel, and cobalt in fused ammonium nitrate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynergistic catalysis of ammonium nitrate decomposition. Visible spectra of ammine, chloro, and nitrato complexes of copper, nickel, and cobalt in fused ammonium nitrateA. G. Keenan and I. J. FerrerCite this: J. Phys. Chem. 1972, 76, 20, 2844–2848Publication Date (Print):Sep…
The Observation of Incipient Phase Transitions in K2PtCl6, K2PdCl6, and K2IrCl6
Measurements of the temperature dependence of the nuclear quadrupole resonance (NQR) frequencies and spin–lattice relaxation times for the 35 Cl nuclei in Cs 2 PtCl 6 , Rb 2 PtCl 6 , K 2 PtCl 6 , and K 2 PdCl 6 provide information on the temperature dependence of two averages of the rotary lattice mode frequency over…
Die Kristallstruktur von Ba13Al22Si10O66
Single crystals of Ba 13 Al 22 Si 10 O 66 were investigated by x-ray methods. The compound crystallizes in the hexagonal space group P 6 3 , with the unit-cell dimensions a = 9.955 ± 0.001 Å, c = 18.590 ± 0.005 Å. There is one formula unit in the unit cell. Three-dimensional Patterson and Fourier syntheses have been c…
Electrical conductivity of heavily doped diamond
The semiconducting properties of boron-, aluminum-, and titanium-doped diamond have been interpreted using the log R (resistance) vs 1/T curves. In boron-doped diamond, ``high-concentration''-type impurity band conduction occurs. The extrinsic ranges of the curves are analyzed with the usual model to yield the activat…