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A technique utilizing electroplating is described for the preparation of specimens for transmission electron microscopy, which show the relation between surface detail and internal structure. The cleared channels in deformed neutron irradiated copper crystals have been correlated with surface slip steps indicating tha…
X-ray photoelectron spectroscopic measurements of various valence states of Fe and Cu in several compounds using ion-sputtering reduction are presented, and the potential usefulness of this time-dependent and in situ method is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of dynamic with isothermal techniques for the study of solid state decomposition kineticsD. W. Johnson Jr. and P. K. GallagherCite this: J. Phys. Chem. 1972, 76, 10, 1474–1479Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Publish…
We report on the synthesis and the measurement of the properties of large single crystals of a new synthetic nonlinear optical material of the sulfosalt type, Tl(3)AsSe(3). The crystal space group is R3m; the refractive indices range from 3.14 to 3.44 with n(0) - n(e) = 0.18 (negative uniaxial), and the material is tr…
The equilibrium dielectric permittivity of pure decalin and the dielectric permittivity and loss of dilute solutions of chlorobenzene, bromobenzene, toluene, tetrahydrofuran, 1-fluoronaphthalene, 1-chloronaphthalene, 1-bromonaphthalene, and 1-methylnaphthalene in decalin have been measured from 50 Hz to 100 kHz at sev…
A study has been made of the relative thermoluminescence response to α- and β-radiation of six phosphors (two types of natural fluorite, CaF2: Mn, CaF2: Tb, CaSO4: Mn and quartz) using samples which are thin compared to the range of the α-particles. The α- and β-radiations induce the same glow peaks, but at low doses…
The lactate dehydrogenase (LDH) from Streptococcus mutans NCTC 10449 is under stringent metabolic control. The partially purified enzyme was specifically activated by high concentrations of fructose-1,6-diphosphate (FDP) and was inhibited by adenosine triphosphate. There appeared to be at least two binding sites for t…
Abstract Using methods described in a previous publication the optical activity of a number of polypeptides and proteins has been calculated. The systems included the α‐helix, the two β‐structures, polyproline I, polyproline II, collagen and collagen models, and poly‐ N ‐methylalanine. In addition to these orderded st…
In autoradiographic studies of tritium distribution in multiphase alloys, both the tritium within the metal and the emanated tritium contribute to darkening of the autoradiographic emulsion; and unless both are considered, erroneous conclusions about tritium segregation may be reached.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuterium isotope effects in quenching of aromatic hydrocarbon fluorescence by conjugated dienesGary N. Taylor and George S. HammondCite this: J. Am. Chem. Soc. 1972, 94, 11, 3687–3692Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected conformational stability of poly(2'azido-2'-deoxyuridylic acid)Paul F. Torrence, James A. Waters, and Bernhard WitkopCite this: J. Am. Chem. Soc. 1972, 94, 10, 3638–3639Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry of fused halide systems. Enthalpies of mixing of the alkaline earth halides with the alkali halidesTerje OestvoldCite this: J. Phys. Chem. 1972, 76, 11, 1616–1628Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published iniss…
Derivative lattices are classified as super, sub and composite, on the basis of the properties of the transformation matrices relating them to the lattice from which they are derived. A method for obtaining the transformation matrices generating these lattices is given. The method has been applied to the derivation of…
The cubic metallic oxide ``TiOx'' exists over the wide homogeneity range 0.8<x<1.30. Though the compound was previously reported to be superconducting above 0.08°K only over the center portion of this range, measurements on well-characterized samples show that the transition temperature is relatively ind…
Abstract Initial rates were measured for the reduction of single pellets of nickel oxide with carbon monoxide at atmospheric pressure and temperatures from 566 to 796°C. The nickel oxide pellets were porous ( ϵ 0 = 0.032 − 0.35) and intrapellet diffusion retarded the rate so that the shrinking core model was not appli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-catalyzed isomerization of 1,2-bis(trimethylsilyl)benzene and related compoundsDietmar Seyferth and David L. WhiteCite this: J. Am. Chem. Soc. 1972, 94, 9, 3132–3138Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published inissue 1 May…
One transformer of a 1000-MVA 525/241.5-kV 60-Hz Y-connected bank of autotransformers, left connected to a 19-mi (30.5-km) 525-kV line but otherwise disconnected from the power system, was overheated after operating for nine minutes in ferroresonance sustained by capacitive coupling to a parallel, energized, 525-kV li…
Abstract The mechanical properties of poly(ethylene terephthalate) are examined to see if the quantitative morphological criteria previously used to define the structural state of isotactic polypropylene will lead to similar quantitative structure‐property correlations when applied to PET. Tenacity, thermal shrinkage…
Abstract A solubility diagram was developed that shows the activity of various ionic and molecular species of Si in equilibrium with amorphous silica as a function of pH. Below pH 8.0 only uncharged Si(OH) 4 contributes significantly to total soluble Si. The solubility of Si was measured on two soils in which equilibr…
Abstract In addition of the piezochromic and the photochromic (dimer A) dimers of 2,4,5-triphenylimidazolyl, two new isomeric dimers were prepared; one (dimer B) being photochromic and the other (dimer C) non-photochromic. Several p-substituted derivatives of the dimers were also prepared. By comparison of their NMR a…