Materials Literature
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The cell surface topology of various gram-negative and -positive, anaerobic and aerobic, mesophilic and thermophilic, cellulolytic and noncellulolytic bacteria was investigated by scanning electron microscopic visualization using cationized ferritin. Characteristic protuberant structures were observed on cells of all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new series of molecular semiconductors: phthalocyanine radicalsP. Turek, P. Petit, J. J. Andre, J. Simon, R. Even, B. Boudjema, G. Guillaud, and M. MaitrotCite this: J. Am. Chem. Soc. 1987, 109, 17, 5119–5122Publication Date (Print):August 1, 1987Publication History Publis…
Abstract The bulk polymerization of L , L ‐dilactide was studied as a function of polymerization temperature ( T p ), time and concentration of catalyst (tin 2‐ethylhexanoate). Poly( L ‐lactide) (PLLA), with the highest value of intrinsic viscosity ([η] = 13 dl · g −1 ; M̄ v ≈ 1 · 10 6 ) and heat of fusion (Δ H m = 64…
The chemically-synthesized emeraldine base form of polyaniline is soluble in aqueous acetic acid solutions, in which it presumably exists as the ‘doped’ emeraldine acetate salt. Films having a conductivity of ≈0.5 –2S/cm may be cast from the solutions. These films may be converted to relatively flexible, free-standing…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Etude de la densite electronique a temperature ambiante dans Ca(BO 2 ) 2 par diffraction RX sur deux cristaux. Ca(BO 2 ) 2 cristallise avec le groupe d'espace Pnca. Affinement de la structure jusqu'a R=0,016 (cristal I) et R=0,024 (cristal II)
Abstract Electro-oxidative polymerization of benzene in the presence of trifluoromethane sulfonic acid yields poly(p-phenylene) efficiently; The acid forms a protonated complex of benzene and cathodically shifts its oxidation potential.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electrical properties of poly(5,6-dihydroxy-2-cyclohexen-1,4-ylene) derivativesD. R. McKean and J. K. StilleCite this: Macromolecules 1987, 20, 8, 1787–1792Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 198…
Native cellulose samples having a wide range of crystallinity and crystallite size were mercerized by treatment with sodium hydroxide. The resultant cellulose II samples showed only a narrow range of crystallinity and an essentially constant crystallite size. For the low-crystallinity samples, crystallinity and crysta…
Calculations of the growth and collapse of transient vapour cavities near a free surface when buoyancy forces may be important are made using the boundary-integral method described in Part 1. Bubble shapes, particle paths, pressure contours and centroid motion are used to illustrate the calculations. In the absence of…
In order to identify the mechanisms behind the adverse effect of oxygen contamination on the densification of TiB 2 ceramics, densification and grain growth behavior during pressureless sintering (1700° to 2050°C) were examined as a function of oxygen content of the powder and compared with those observed during hot‐p…
A paramagnetic-labeled macromolecule, albumin-(Gd-DTPA), was prepared for use as an intravascular contrast agent for magnetic resonance imaging. An average of 19 Gd-DTPA chelates were covalently conjugated to human serum albumin through the bifunctional anhydride of DTPA. The albumin-(Gd-DTPA) was characterized with u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Bond strengths in the second and third periodsMichael W. Schmidt, Phi N. Truong, and Mark S. GordonCite this: J. Am. Chem. Soc. 1987, 109, 17, 5217–5227Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987ht…
The control of isocitrate dehydrogenase through phosphorylation is necessary for growth of Escherichia coli on acetate as the sole carbon source. To understand the mechanism by which phosphorylation inactivates isocitrate dehydrogenase, the sequence of icd, the isocitrate dehydrogenase structural gene, was determined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence properties of organometallic complexesAlistair J. LeesCite this: Chem. Rev. 1987, 87, 4, 711–743Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/cr00080a003https:…
Porosities of porous silicon layers formed on different types of substrates and under different experimental conditions are compared with and related to the pore size distribution determined by gas adsorption experiments. Results show that porous layers formed on lightly P‐doped silicon exhibit a network of very narro…
Electrochemical and physical aspects of the dissolution of hydrogen in niobium with an ideal or a real structure are discussed. The interactions of hydrogen with various crystal lattice defects and the changes in physico-mechanical characteristics of niobium caused by hydrogenation are analysed. Data on the kinetics a…
The principal advances in the theory and practice concerning the initial stages of the electrocrystallisation of metals are considered. The thermodynamic and kinetic relations for the phase formation processes in electrochemical systems and the influence of the kinetics of the discharge of ions and of the adsorption o…
An analysis has been made of the linear response of polarization to a uniform change in temperature, in its gradient (thermal polarization effect), in macroscopic deformation and in its gradient (flexoelectric effect). It has been shown how the use of some definitions of polarization widespread in the literature can l…
Microcrystalline samples of BC8 silicon III and hexagonal silicon IV, grown under high pressure in the diamond anvil cell, remain metastable at ambient pressure. Hall-effect and low-temperature resistivity measurements show Si III to be a hole semimetal with p\ensuremath{\approxeq}5\ifmmode\times\else\texttimes\fi{}${…