Materials Literature
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In Escherichia coli, p-aminobenzoate (PABA) is synthesized from chorismate and glutamine in two steps. Aminodeoxychorismate synthase components I and II, encoded by pabB and pabA, respectively, convert chorismate and glutamine to 4-amino-4-deoxychorismate (ADC) and glutamate, respectively. ADC lyase, encoded by pabC,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic behavior of nickel(II)-imino nitroxide derivativesDominique Luneau, Paul Rey, Jean Laugier, Elie Belorizky, and Andre CogneCite this: Inorg. Chem. 1992, 31, 17, 3578–3584Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publis…
The statistical evolution of a two-dimensional polygonal, or ‘dry’, foam during diffusion of gas between bubbles lends itself to a very simple mathematical description by combining physical principles discovered by Young. Laplace, Plateau, and von Neumann over a period of a century and a half. Following a brief review…
Following the first determinations of protein structures in the late 1950s and the early 1960s (see for example Kendrew et al. 1960; Perutz, 1964), the three-dimensional structures of several hundred proteins have been elucidated by X-ray diffraction on single crystals. By the end of 1991, approximately 150 entries of…
Abstract The source and the effects of strain‐induced heating on the stress‐strain behavior and corresponding cold drawing process of glassy polymers are investigated. The nature of dissipative and stored components of work are discussed where only 50 to 80% of the mechanical work of glassy polymers has been found to…
The purpose of this paper is to describe the response of an aligned, lubri cated fiber bundle to a general state of three-dimensional stress. Such an element can be used to represent an advanced composite during manufacturing. In general, this bundle can deform by both viscous shearing, and by "cylindrical" modes of e…
NAD(+)-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae is composed of two nonidentical subunits, designated IDH1 and IDH2. The gene encoding IDH2 was previously cloned and sequenced (Cupp, J.R., and McAlister-Henn, L. (1991) J. Biol. Chem. 266, 22199-22205), and in this paper we describe the isolation…
Abstract The processing of a new series of liquid crystalline (LC) epoxy networks was evaluated. Above the glass transition temperature, the low crosslink density networks could be mechanically aligned. The mechanically oriented networks readily lost orientation upon heating. Highly anisotropic liquid crystalline (LC)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear manganese(II) complexes with water and carboxylate bridgesShi Bao Yu, Stephen J. Lippard, Itzhak Shweky, and Avi BinoCite this: Inorg. Chem. 1992, 31, 17, 3502–3504Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular mechanics study of the ruffling of metalloporphyrinsOrde Q. Munro, Julia C. Bradley, Robert D. Hancock, Helder M. Marques, Fabrizio Marsicano, and Peter W. WadeCite this: J. Am. Chem. Soc. 1992, 114, 18, 7218–7230Publication Date (Print):August 1, 1992Publication H…
The oxidation behavior and microstructure of the oxidized surfaces of RE 2 Si 2 O 7 –Si 3 N 4 ceramics were investigated. The high oxidation resistance of these materials at 1400°C is attributed to the minimization of amorphous phases via devitrification to disilicates that are in equilibrium with SiO 2 , the oxidatio…
The shear flow behavior of a unidomain nematic solution of poly(n‐hexyl isocyanate) (PHIC) subjected to an electric field was studied experimentally in a parallel plate rotational rheometer. At a shear rate of 0.4 s‐1, the Miesowicz viscosity ηc (with the director oriented along the velocity gradient) was found to be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of single silver nanoclusters within spherical microdomains in block copolymer filmsY. Ng Cheong Chan, R. R. Schrock, and R. E. CohenCite this: J. Am. Chem. Soc. 1992, 114, 18, 7295–7296Publication Date (Print):August 1, 1992Publication History Published online1 Ma…
BACKGROUND: Biomaterial pretreatment with endothelial cell mitogens may enhance endothelialization. METHODS: Modified fibrin glue (FG) containing 1 ng/cm2 recombinant 125I-labeled fibroblast growth factor type 1 (125I-FGF-1), 20 micrograms/cm2 heparin, 2.86 mg/cm2 fibrinogen, and 2.86 x 10(-2) units/cm2 thrombin was p…
The fabrication and intergranular‐phase devitrification of silicon nitride densified with rare‐earth (RE) oxide additives has been investigated. The additions of the oxides of Sm, Gd, Dy, Er, and Yb, having high melting points and behaving similarly to Y 2 O 3 , were compositionally controlled to tailor a microstructu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics of pentachlorophenate degradation in aqueous solution by means of ultrasoundChristian Petrier, Marc Micolle, Gerard Merlin, Jean Louis Luche, and Gilbert ReverdyCite this: Environ. Sci. Technol. 1992, 26, 8, 1639–1642Publication Date (Print):August 1, 1992Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and decomposition of acetylene on silicon(100)-(2.times.1)P. A. Taylor, R. M. Wallace, C. C. Cheng, W. H. Weinberg, M. J. Dresser, W. J. Choyke, and J. T. Yates Jr.Cite this: J. Am. Chem. Soc. 1992, 114, 17, 6754–6760Publication Date (Print):August 1, 1992Publicat…
The High-Temperature Engineering Test Reactor (HTTR) is a 30-MW(thermal) helium gas-cooled reactor with a core composed of prismatic graphite blocks piled on core support structures. Safety analyses have been made for the seismic design of the HTTR core using a two-dimensional seismic analysis code called SONATINA-2V,…
Le terme époxyde désigne une grande variété de prépolymères comportant un ou plusieurs motifs époxydiques qui, après polycondensation avec un durcisseur, conduisant à des produits thermodurcis dont les principales applications concernent le collage et les matériaux composites (matrice époxyde avec d
Deposition of α‐Si 3 N 4 from SiF 4 and NH 3 was systematically studied using an axisymmetric, vertical hot‐wall reactor in the temperature range of 1340° to 1490°C. The relationship between process variables and deposition behavior was identified. The deposition process was most strongly influenced by temperature. In…