Materials Literature
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Ionomers are an interesting class of high polymers that have been widely studied over the last few decades. They are now being utilized, or considered, for various industrial applications. Ionomers are ion-containing polymers, usually with an ion content up to 10 to 15 mol% . The presence of ionic groups and their int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Structures of Hexamine Cross-Linked Novolac Blends. 1. Blends with Poly(methyl methacrylate)Xiaoqing Zhang and David H. SolomonCite this: Macromolecules 1994, 27, 18, 4919–4926Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Publishe…
The binding of different inhibitors to glucoamylase G2 from Aspergillus niger and its temperature and pH dependencies have been studied by titration calorimetry. The enzyme binds the inhibitors 1-deoxynojirimycin and the pseudo-tetrasaccharide acarbose with association constants of 3 x 10(4) and 9 x 10(11) M-1, respec…
Abstract Two orientations of white micas with subordinate chlorite have been observed in a fine-grained (50 Å to 2 μ m) matrix of a Silurian lower anchizonal mudrock from central Wales: one parallel to bedding and one parallel to cleavage that is approximately 30°-50° to bedding. Bedding-parallel micas consist of smal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTspin-Crossover Behavior in the Fe(tap)2(NCS)2.cntdot.nCH3CN System (tap = 1,4,5,8-Tetraazaphenanthrene; n = 1, 1/2). Crystal Structures and Magnetic Properties of Both SolvatesJose Antonio Real, M. Carmen Munoz, Enrique Andres, Thierry Granier, and Bernard GalloisCite this:…
Abstract The functional aluminum alkoxide, Et 2 AlO(CH 2 ) 2 O‐C(O)C(CH 3 )CH 2 , is a very effective initiator for the ( D , L )‐lactide (LA) polymerization in toluene at 707deg;C. The coordination‐insertion type of polymerization is living and exclusively yields linear P ( D , L )‐lactide macromonomers of a pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the Structures of the Five-Coordinate Cobalt(II)Pyridine, Five-Coordinate Cobalt(III) Methyl, and Six-Coordinate Cobalt(III) Methyl Pyridine Complexes of OctaethylporphyrinJack S. Summers, Jeffrey L. Petersen, and Alan M. StolzenbergCite this: J. Am. Chem. Soc.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTC2H4 Insertion into PtII-SiH3 and PtII-H Bonds. An ab Initio MO/MP4 StudyShigeyoshi Sakaki, Masahiro Ogawa, Yasuo Musashi, and Toru AraiCite this: J. Am. Chem. Soc. 1994, 116, 16, 7258–7265Publication Date (Print):August 1, 1994Publication History Published online1 May 2002P…
The cumulative and comparative effects of chronological and actinic changes to the skin were studied in an elderly population. Two adjacent sites with different degrees of exposure to the sun were examined to distinguish the contribution of each factor, by means of noninvasive measurements. The following parameters we…
An approach to the nonlinear stress–strain behavior of ceramic matrix composites was proposed, based upon damage mechanics. Damage–loading relations taking into account effects of anisotropy and coupling were established. These relations allowed prediction of the stress–strain behavior, and ultimate failure. The theor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning Probe Microscopy Study of Layered Dichalcogenide ReS2S. P. Kelty, A. F. Ruppert, R. R. Chianelli, J. Ren, and M.-H. WhangboCite this: J. Am. Chem. Soc. 1994, 116, 17, 7857–7863Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible Migration of Lithium in MontmorillonitesRafael Alvero, Maria D. Alba, Miguel A. Castro, and Jose M. TrilloCite this: J. Phys. Chem. 1994, 98, 32, 7848–7853Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 Augu…
The Bacillus subtilis citrate synthase genes citA and citZ were repressed during early exponential growth phase in nutrient broth medium and were induced as cells reached the end of exponential phase. Both genes were also induced by treatment of cells with the drug decoyinine. After induction, the steady-state level o…
Mild steel was exposed to Pseudomonas sp. S9 or Serratia marcescens in synthetic seawater. An increase in corrosion resistance over that in natural seawater was monitored by electrochemical techniques. Biological analyses were performed to characterize the system. The inhibition effect also was observed when mild stee…
The lumazine synthase/riboflavin synthase complex of Bacillus subtilis consists of an icosahedral capsid of 60 beta subunits enclosing a triplet of alpha subunits. An X-ray structure of 0.32 nm resolution has been obtained for the icosahedral capsid of the native alpha 3 beta 60 complex [Ladenstein, R., Schneider, M.,…
Effects of hydrostatic pressure on Raman scattering and electronic absorption spectra have been investigated in layered cupric chloride (C2H5NH3)2CuCl4, consisting of strongly Jahn–Teller (JT) deformed CuCl4 layers. We observed selective deactivation of the Cu–Cl stretching modes at a pressure above ∼4 GPa, and interp…
The physical and electrical properties of Pb[(Sc 1/2 Nb 1/2 ) 1- x Ti x ]O 3 ( x =0.40–0.45)+0.01 PbNb 2 O 6 piezoelectric polycrystalline ceramic materials near the morphotropic phase boundary (MPB) were investigated. The maximum dielectric constant ( ε 33 T / ε 0 =3200) and maximum piezoelectric constant ( d 33 =590…
Many animals from different phyla use structures bearing arrays of hairs to perform a variety of important functions, such as olfaction, gas exchange, suspension feeding and locomotion. The performance of all these functions depends on the motion of water or air around and through these arrays of hairs. Because organi…
We measure optically the order induced by a stabilizing electric field $E$ in the isotropic phase of a liquid crystal mixture of ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{octyl}\ensuremath{-}\mathrm{cyanobiphenyl}$ and ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{decyl}\ensuremath{-}\mathr…
A new solid‐state electrochromic system is presented. It is transparent and is comprised of a tungsten oxide and Prussian blue (PB) thin film couple in combination with a proton‐conducting, solid polymer electrolyte. This electrochromic system exhibits rapid and deep optical switching; characteristic of a complementar…