Materials Literature
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Radiation-induced optical absorption in crystalline SiO2 has been investigated in a number of synthetic quartz crystals. The dominant visible absorption band peaks at 2.5 eV and correlates directly with the paramagnetic resonance signal of the (Ale+)0 center. Similarities in behavior with the V− center in MgO suggest…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrrole studies. 22. [4.pi. + 2.pi.] Cycloaddition reactions with vinylpyrrolesR. Alan Jones, Michael T. P. Marriott, W. Philip Rosenthal, and Jose Sepulveda ArquesCite this: J. Org. Chem. 1980, 45, 22, 4515–4519Publication Date (Print):October 1, 1980Publication History Pub…
${\mathrm{K}}_{2}$Se${\mathrm{O}}_{4}$ undergoes an incommensurate structural transformation at ${T}_{0}=128$ K followed by a commensurate "lock-in" transformation at ${T}_{c}=93$ K. Below ${T}_{0}$, the soft-phonon mode associated with the transformation is "split" into modes representing fluctuations in amplitude an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed valence and magnetically coupled vanadate domains in heteropoly tungstate anionsMagdi M. Mossoba, Charles J. O'Connor, Michael T. Pope, Ekk Sinn, Gilbert Herve, and Andre TezeCite this: J. Am. Chem. Soc. 1980, 102, 22, 6864–6866Publication Date (Print):October 15, 1980…
Abstract The rarity of glass‐forming materials requires the existence of topologically specific principles (over and above the randomness implied by the absence of long‐range order) which optimize the glass‐forming tendency (gft). For covalent glassy semiconductors an algebraic condition predicts correctly the composi…
W Bardsley, D T J Hurle and J B Mullin (eds) 1979 Amsterdam: North-Holland ix + 408 pp price $53.75 This book is based on notes produced by lecturers to the third international summer school on crystal growth (ISSCG-3) held at the University of New Hampshire in July 1977. The tutorial approach is intended to aid the t…
The effects of diabetes on collagen cross-link formation and solubility were investigated in granulation tissue collagen induced by polyester fabric implanted subcutaneously in rats at the same time diabetes was produced by injection of streptozotocin. Thus, all the collagen analyzed was formed in a diabetic milieu. T…
Actin from rabbit skeletal muscle has been modified with the fluorescent label N-iodoacetyl-N'-(5-sulfo-1-naphthyl)ethylenediamine (1,5-I-AEDANS). Under conditions where the actin is in the unpolymerized form (G-actin), the addition of Mg2+ or KCl results in enhancement of the fluorescence. Titration of the labeled G-…
The nucleotide sequence was determined for the chicken egg white lysozyme mRNA and for the exons of the gene together with their flanking intron regions. The exon pattern is to some degree related to the structural subdivision of the final protein product. However, the relationship of exons to functional units of the…
Abstract A highly sensitive indirect spectrophotometric method for phosphate was developed. The ion-association complex of molybdophosphate with Methylene Blue was precipitated in a nitric-acid medium. The complex was adsorbed on (1+4 v/v) cyclohexane–MIBK. The excess of Methylene Blue was removed by washing the organ…
Abstract Tongue-and-groove pliers are often used in burglaries to twist off doorknobs (to gain entrance) and it was deemed necessary to determine if new, sequentially manufactured pliers would each produce similar toolmarks that would be indistinguishable. Evaluation of the toolmarks from three sets of sequentially br…
Void formation is shown to be a significant response of styrene-isoprene-styrene block copolymers under conditions of tensile stress relaxation. When brought to zero stress, these voids are observed to close and heal, restoring the original mechanical properties of the undamaged material. Dark-field optical microscopy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of trichlorobis(4-cyanopyridine-N1)iron(III): a rare example of a MX3L2 trigonal-bipyramidal complex of iron(III)Jean Claude Daran, Yves Jeannin, and Liliana Maria MartinCite this: Inorg. Chem. 1980, 19, 10, 2935–2940Publication Date (Print):O…
Abstract The role of surface renewal and feedback phenomena in devolatilization equipment is clearly illustrated via staged models. A continuous model for the vented, single‐screw devolatilizer is developed, including barrel evaporation and bulk surface renewal as well as backmixing, which represents de‐volatilization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of .alpha.,.beta.-epoxysilanes with Grignard reagents. Generation and trapping of .alpha.-trimethylsilyl aldehydes and ketonesPaul F. Hudrlik, Anne M. Hudrlik, Raj N. Misra, David Peterson, Gregory P. Withers, and Ashok K. KulkarniCite this: J. Org. Chem. 1980, 45,…
The fate of s.c. implants of fibrous, trypsin-purified human dermal collagen and collagen cross-linked with formaldehyde and glutaraldehyde has been studied in rats. Dermal collagen, and untreated skin implants, underwent resorption associated with a pronounced round-cell reaction. While collagen implants cross-linked…
Abstract Different methods of measuring elastic constants of nematic liquid crystals by deformation of homogeneously and homeotropically oriented layers through external magnetic and electric fields, respectively, are critically examined. Possible sources of uncertainties are quantitatively explored. An approximative…
Abstract The thermal decomposition of poly(vinyl chloride) (PVC) mixed with several metal oxides was investigated by direct pyrolysis in a mass spectrometer (MS) and flash pyrolysis–gas chromatography. Our results show that the thermal decomposition of PVC occurs in two stages. Unsubstituted aromatic hydrocarbons (ben…
Abstract The pH, Eh, electrical conductivity (EC), and the amounts and valency of replaceable iron were measured periodically on Fe 2+ - and Fe 3+ -saturated montmorillonite and cation-exchange resin at three temperatures. Differences in the pattern of change of pH, Eh, and EC with time appear to be related more to th…
Binary copper alloys containing 25 and 50% manganese were corroded in sodium chloride solution at various fixed potentials spanning their corrosion potential. Both Cu‐Mn alloys exhibited dealloying at a high rate. The Cu‐25%Mn alloy exhibited dealloying behavior similar to that observed in the Cu‐Zn and Cu‐Ni systems.…