Materials Literature
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The Raman laser temperature-jump technique has been used to measure the kinetics of the coil to helix reaction of poly(cytidylic acid) [poly(C)] in aqueous cosolvent mixtures. The rate of helix formation has a low activation energy and is proportional to reciprocal solvent viscosity. The observations suggest helix for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of manganese(II) phthalocyanine by molecular oxygenA. B. P. Lever, J. P. Wilshire, and S. K. QuanCite this: Inorg. Chem. 1981, 20, 3, 761–768Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 March 1981https://pu…
Abstract The impact modification mechanisms of polycarbonate (PC) blended with polyethylene (PE) and blends of polyxylenol ether (PXE)/high impact polystyrene (HIPS), were studied using a volume dilation technique. With two extensometers, measurements of volume change during tensile deformation were made on the plasti…
Mixed crystals Pb3(PO4)2--Pb3(AsO4)2 are ferroelastic at low temperatures. The phase diagram contains three different phases a (paraelastic), \tt b and \tt c (both ferroelastic). The transformation \tt a-\tt b is first order for Pb3(PO4)2 and approaches second-order behaviour with increasing As content. The spontaneou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual platinum complexes of deprotonated 1-methylcytosine: bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-diammineplatinum(II)) dinitrate dihydrate, [(NH3)2Pt(C5H6N3O)2Pt(NH3)2](NO3)2.2H2O, and [diaquahydrogen(1+)][bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-nitrodiammineplatin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectral speciation of iron tetrakis(N-methyl-4-pyridyl)porphyrin in aqueous mediaPaul A. Forshey and Theodore KuwanaCite this: Inorg. Chem. 1981, 20, 3, 693–700Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published…
Crystallographic data concerning geometric properties of hexagonal lattices of Cα, Zn, Beα, Tiα, Zrα, Mg and Cd are obtained from two different computation techniques. These properties are related to the relative orientations of identical hexagonal lattices 1 and 2 which superimpose two multiple cells M1 and M2 within…
The saturation magnetostriction of permalloy films has been measured as a function of film composition. In general, the data obtained agrees with the published values for bulk polycrystalline permalloy. It has further been established that the composition for zero magnetostriction is at about 81.5 (wt.)% Ni. The exact…
Changes which occur on the surface of mild steel coupons submerged in cultures of an Fe(III)-reducing bacterium, isolated from corroded pipe systems carrying crude oil, were studied microscopically to investigate the interaction between the corrosion-causing bacterium and the corroding mild steel coupon. Under micro-a…
A formula is derived for the illuminance at any surface in an optical system. By tracing a single ray one can compute the flux density at the image plane or any other position along the ray. The formula involves the ratio of the products of the principal curvatures of the wave front as it approaches each surface to pr…
Abstract A technique for the measurement of the dynamic Young's modulus E and logarithmic decrement 𝓋 of protein crystals and other microscopic samples by the resonance method modified to a microscale is described. Monoclinic crystals of horse hemoglobin and sperm whale myoglobin; triclinic hen egg white lysozyme crys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of poly(ethylenimine). 1. Structures of two hydrates of poly(ethylenimine): sesquihydrate and dihydrateYozo Chatani, Hiroyuki Tadokoro, Takeo Saegusa, and Hiroharu IkedaCite this: Macromolecules 1981, 14, 2, 315–321Publication Date (Print):March 1, 1981Pub…
The structure of seven sodium borosilicate glasses was calculated using molecular dynamics. Consistent with Zachariasen's rules of glass formation, silicon and boron were found to form a continuous near‐random network of SiO 4 , BO 3 , and BO 4 polyhedra linked to each other at corners, whereas sodium ions occupied in…
A number of summation methods for simulating polar liquids are compared using the Stockmayer potential fluid. The nearest image convention is found to have thermodynamic properties dependent on the cell shape. Spherical truncation and a summation proposed by Smith and Perram give reasonable agreement with the thermody…
The chemisorption of CO on an Fe (110) surface has been investigated at 120 K using high resolution electron energy loss spectroscopy (EELS) and low energy electron diffraction (LEED). At CO exposures up to 0.7 L two vibrational losses around 456 cm−1 and 1890 cm−1 are observed both shifting to higher frequencies with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotooxidation of (2,2'-bipyridine)(3,4-toluenedithiolato)platinum(II) following ligand-to-ligand and charge-transfer excitationArnd Vogler and Horst KunkelyCite this: J. Am. Chem. Soc. 1981, 103, 6, 1559–1560Publication Date (Print):March 1, 1981Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrivacant heteropolytungstate derivatives: the rational synthesis, characterization, and tungsten-183 NMR spectra of P2W18M4(H2O)2O6810- (M = cobalt,copper,zinc)Richard G. Finke, Mike Droege, James R. Hutchinson, and Otto GansowCite this: J. Am. Chem. Soc. 1981, 103, 6, 1587…
We previously reported the use of polymeric delivery systems capable of sustained release of substances with molecular weights up to 2 X 10(6). The current study examined the tissue compatibilities of these slow-release agents and of other polymeric materials. To observe in vivo host responses to specific implants, te…
The structure of K3[Cr(CN) 6] at 4.2 K has been determined by a single-crystal neutron diffraction study. The crystal was found to consist of four twins together with stacking disorder [triclinic, P1, a = 8.450 (5), b = 10.576 (8), c = 13.557 (4)/k, (~ = 90.0 (1),/~ = 90.0 (1), y = 90-0 (1)°1. Refinement of atom param…
Recently, the analysis of the transient field problems in the cross section of a microalternator during a field decrement test was described. Here, a simplified formulation of the transient field problems is achieved with the introduction of the currents in the closed windings as additional state variables to the fiel…