Materials Literature
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An isothermal oxidation apparatus (IOA) has been modified to include an oxygen sensor so that both oxidation and deposition data can be measured for jet fuels that are thermally stressed. This modification is useful for comparing the relative oxidation rates of jet fuels and fuels blended with additives. Antioxidants…
New lactide-based polydepsipeptide polymer networks and cross-linked beads have been prepared by UV photopolymerization of acrylated poly( l -lactic acid- co -glycolic acid- co - l -serine) [PLA(Glc-Ser)]. These materials have been developed for use as polymer scaffolds in tissue engineering, cell encapsulation, and i…
The structure of alanine racemase from Bacillus stearothermophilus with the inhibitor propionate bound in the active site was determined by X-ray crystallography to a resolution of 1.9 A. The enzyme is a homodimer in solution and crystallizes with a dimer in the asymmetric unit. Both active sites contain a pyridoxal 5…
The local structure of non-porphyrin Ni and V in Maya residuum, hydrocracked residuum, and toluene-insoluble solid were determined by XAFS spectroscopy. In residuum, the first coordination shell of non-porphyrin V is similar to that for vanadyl tetraphenylporphyrin with four N at a distance of 2.08 Å and one O at 1.67…
The degradation of poly(ethylene) (PE) (8 g)/poly(vinyl chloride) (2 g) at 430 °C, poly(propylene) (PP) (8 g)/PVC (2 g) at 380 °C, and poly(styrene) (PS) (8 g)/PVC (2 g) at 360 °C into fuel oil was carried out in a glass reactor under atmospheric pressure by batch operation. The purpose of this study is to determine t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoresponsive Molecular Switch to Control Chemical Fixation of CO2Hiroshi Sugimoto, Takayuki Kimura, and Shohei InoueView Author Information Department of Industrial Chemistry, Faculty of Engineering Science University of Tokyo Kagurazaka, Shinjuku-ku, Tokyo 162-8601…
The synthesis and atomic structure of [Mn4O4L6]+(CF3SO3-), 1+OTf- (L = diphenylphosphinate), is reported. This new model for the photosynthetic water oxidizing complex extends the known [Mn4O4]n+ cubane core type to the Mn4(III,3IV) oxidation state. Synthesis of this cluster is achieved by one-electron oxidation of Mn…
Interaction between Astramol poly(propylene imine) dendrimers of five generations, DAB- dendr -(NH 2 ) x (where x is equal to 4, 8, 16, 32, or 64) and linear poly(sodium acrylate), poly(acrylic) acid, poly(sodium styrenesulfonate), or native DNA was studied in salt-free solutions by means of potentiometric, argentomet…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSingle-Grain Lamellar Microdomain from a Diblock CopolymerJeffrey Bodycomb, Yoshinori Funaki, Kohtaro Kimishima, and Takeji HashimotoView Author Information Hashimoto Polymer Phasing Project, ERATO, JST, 15 Morimoto-cho, Shimogamo,…
Short-chain dehydrogenases/reductases (SDR) and medium-chain dehydrogenases/reductases (MDR) are protein families originally distinguished from characterisations of alcohol dehydrogenase of these two types. Screening of completed genome sequences now reveals that both these families are large, wide-spread and complex.…
A processing approach has been identified and reduced to practice in which a residual stress profile can be designed such that cracks in a brittle material are arrested or grow in a stable manner. In the approach, cracks in the body encounter an increase in the magnitude of residual compression as the crack propagates…
We study the time evolution of a sessile liquid droplet, which is initially put onto a solid surface in a nonequilibrium configuration and then evolves towards its equilibrium shape. We adapt here the standard approach to the dynamics of mechanical dissipative systems, in which the driving force, i.e., the gradient of…
The annealing behavior of zirconia and mixed zirconia−silica matrices (with different ZrO 2 /SiO 2 molar ratios) containing silver nanoclusters, synthesized by the sol−gel technique has been investigated. The film samples of the general formula (SiO 2 ) x (ZrO 2 ) (0.9 - x ) Ag 0.1 ( x = 0, 0.225, 0.45, 0.675, and 0.9…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Novel Synthesis of Alkyl, Aryl, Alkenyl, and Alkynyl 1,6-DiketonesAlan R. Katritzky, Zhizhen Huang, Yunfeng Fang, and Indra PrakashView Author Information Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, and M…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInfrared Band Broadening and Interactions in Polar SystemsPaul C. Painter, George J. Pehlert, Yuhong Hu, and Michael M. ColemanView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 19802 Cite th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCharge Fluctuation in MMX Chain Compounds, A4[Pt2(pop)4I]·nH2OM. Yamashita, S. Miya, T. Kawashima, T. Manabe, T. Sonoyama, H. Kitagawa, T. Mitani, H. Okamoto, and R. IkedaView Author Information Graduate School of Human Informatics and PRESTO(JST) Nagoya University Chi…
The reaction of mononuclear [LFe III ] where L represents the trianionic ligand 1,4,7-tris(4- tert -butyl-2-mercaptobenzyl)-1,4,7-triazacyclononane with CrSO 4 ·5H 2 O, CoCl 2 ·6H 2 O, or Fe(BF 4 ) 2 ·6H 2 O and subsequent oxidation with ferrocenium hexafluorophosphate or NO(BF 4 ) or reduction with [(tmcn)Mo(CO) 3 ]…
In the title compound extended sheets of cobalt(II) ions, linked in a square array by bridging formates, couple antiferromagnetically. Spin canting generates residual spin on the sheets, and interaction between the sheets leads to long-range ferromagnetic ordering and spontaneous magnetization below 9 K.
A functionalized, highly ordered mesoporous hybrid material based on the MCM-41 structure is synthesized through room temperature cocondensation of 3-(trimethoxysilyl)propyl methacrylate (TMSiPMA) and tetramethyl orthosilicate (TMOS) in molar ratios of up to 1:3 in the presence of cetyltrimethylammonium chloride. Succ…
Organic−inorganic hybrids prepared by the sol−gel process are investigated by infrared spectroscopy at room temperature. The matrix of the so-called ureasils is a silica network to which oligopolyoxyethylene chains are grafted by means of urea cross-links. The ureasils prepared U(2000), U(900), and U(600) are obtained…