Materials Literature
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Shewanella colwelliana, a marine bacterium which grows in association with oysters, has been found to produce an unusual extracellular polymer which mediates irreversible adhesion of the bacterium to surfaces. Production of the polymer was enhanced when the bacterium was grown on marine agar, overlaid with a dialysis…
The efficacy of NaOCl and a mixture of NaOCl and NaBr as biocides at reducing the numbers and metabolic activity of sessile bacteria on carbon steel in a moderately alkaline test medium were evaluated. The polarization resistances, measured by electrochemical impedance spectroscopy (EIS) of the carbon steel coupons, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology formation by combined effect of crystallization and phase separation in a binary blend of poly(iε-caprolactone) and polystyrene oligomerShuichi Nojima, Kunihiko Satoh, and Tamaichi AshidaCite this: Macromolecules 1991, 24, 4, 942–947Publication Date (Print):Februa…
Most members of the NaZr 2 P 3 O 12 (NZP) family possess low, near zero, overall thermal expansion coefficients. However, they also exhibit anisotropy of axial thermal expansion. Some compounds have opposite anisotropy; for example, the a parameter of CaZr 4 P 6 O 24 contracts on heating and that of SrZr 4 P 6 O 24 ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMercerization of cellulose. 6. Crystal and molecular structure of Na-cellulose IVHisao Nishimura and Anatole SarkoCite this: Macromolecules 1991, 24, 3, 771–778Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of octaacetonitriledimolybdenum(II) tetrafluoroborateF. Albert Cotton and Kenneth J. WiesingerCite this: Inorg. Chem. 1991, 30, 4, 871–873Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1…
Molecular dynamics simulations have been performed on a simple fluid in the non-Newtonian regime in order to study the nature of diffusion in the presence of shear stress. The nonequilibrium molecular dynamics (NEMD) sllod algorithm is used to generate a homogeneous boundary driven Couette flow. The elements of the te…
The La 2 Zr 2 O 7 phase was prepared from metal acetylacetonates by a sol—gel route without any intermediate phase formation. X‐ray peaks appeared at a temperature as low as 500°C at the positions expected for La 2 Zr 2 O 7 , although they were broad. The crystal structure of La 2 Zr 2 O 7 was found to be of the fluor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal spectroscopic studies of Fe(SR)42- (R = 2-(Ph)C6H4): electronic structure of the ferrous site in rubredoxinMatthew S. Gebhard, Stephen A. Koch, Michelle Millar, Frank J. Devlin, Philip J. Stephens, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1991, 113, 5…
The enzyme clavaminate synthase (CS) catalyzes the formation of the first bicyclic intermediate in the biosynthetic pathway to the potent beta-lactamase inhibitor clavulanic acid. Our previous work has led to the proposal that the cyclization/desaturation of the substrate proclavaminate proceeds in two oxidative steps…
This paper reviews and interprets the available literature and practical experience related to the activation of wood surfaces by oxidative pretreatment to improve adhesive bonding. Prior experiments on paper and wood surfaces are reviewed, along with commercial experience with activation of paper surfaces by corona,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecakis(2,6-diethylphenyl)decastanna[5]prismane: characterization and molecular structureLawrence R. Sita and Isamu KinoshitaCite this: J. Am. Chem. Soc. 1991, 113, 5, 1856–1857Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published i…
Abstract Core KM-3 at Searles Lake, California, comprises 693.4 m of lacustrine sediments deposited over the past 3.2 m.y. The lake water evolved from moderately saline, slightly alkaline, and dominated by Na, Ca, Cl, SO 4 , and HCO 3 + CO 3 to a highly alkaline brine dominated by Na and CO, ions. Sediments are chiefl…
Abstract Experiments directed towards obtaining high‐resolution XPS data for spin‐cast thin films of poly(methylmethacrylate) (PMMA) on a silicon substrate are described. Thickness‐dependent charging and the effect of vertical differential charging on spectral resolution are demonstrated, and the conditions required f…
Abstract Surface‐enhanced Raman scattering (SERS) of sulphur‐containing amino acids and peptides ( L ‐cysteine, L ‐cystine, L ‐methionine, L ‐methionylglycine and glycyl‐ L ‐methionine) in silver sol was investigated. The Raman signal was enhanced by a factor of about 10 5 . In the pH range 5–11, L ‐cysteine was found…
When a fluid composed of sufficiently asymmetric hard particles is compressed, purely entropic effects give rise to phases possessing long-range orientational and, in some cases, translational order. The various ordered phases observed in conventional lyotropic liquid-crystal systems are commonly described in terms of…
Abstract The crystal structures of polymorph II of diisothiocyanatobis(2,2′-bipyridine)iron(II), [Fe(bpy)2(NCS)2], in the high- (298 K) and low-spin states (175, 110 K) were determined by an X-ray diffraction method. The crystal is orthorhombic, space group Pcnb and Z=4 over the entire temperature range. At 298 K, a=1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[Cu3(.mu.3-.eta.1-C.tplbond.CPh)2(.mu.-Ph2PCH2PPh2)3][BF4], a triangulo copper(I) complex with an unprecedented bicapping system of two asymmetric .mu.3-.eta.1-acetylide ligandsJosefina Diez, M. Pilar Gamasa, Jose Gimeno, Angel Aguirre, and Santiago Garcia-GrandaCite this: O…
Effects of some additives (V, Cr, Mn, Co, Ni, Pd, Pt) on thermoelectric properties of FeSi 2 thin films were studied. V, Cr or Mn-doped FeSi 2 films were of p-type semiconductor and Co, Ni, Pd and Pt-doped FeSi 2 films of n-type semiconductor. It was indicated that V or Cr are more suitable additives in thermoelectric…