Materials Literature
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Dolichyl-phosphate-mannose synthase is a membrane-bound enzyme of the endoplasmic reticulum that catalyzes the formation of dolichyl phosphate mannose from dolichyl phosphate and GDP-mannose. It is an essential enzyme for growth of Saccharomyces cerevisiae, and, like other enzymes that utilize some form of the lipid d…
Abstract The maximum crystal radius R n of ice in hollow wet chrysotile tubes is established by thermoporometry to be between 2.8 and 3.2 nm, and the internal pore volume V n of the tubes to be between 0.008 and 0.02 ml/g. The hollow tubes of chrysotile and, for comparative reasons, small plates of talc, are hydrother…
A combined elevated pressure reactor/ultrahigh vacuum (UHV) surface analytical system has been designed for studies of heterogeneous catalytic reactions. The reaction cell is separated from the surface analysis chamber by a differentially pumped sliding seal. This feature allows simple in situ sample transfer capabili…
As part of a study of milkweed fibers, various blends of cotton and milkweed were created and the physical fiber and yam properties analyzed. The study included a unique investigation of transverse properties of wall thickness and linear density. Spin ning trials of blends with very high percentages of milkweed fibers…
Abstract The ESR spectra of tetrathiafulvalene (TTF) derivatives substituted with imino pyrolidine- and piperidine-1-oxyls and their cation radicals were investigated. For the neutral TTF’s the unpaired electron is localized at the nitroxide group. While, an intramolecular spin-spin exchange albeit weak occurs between…
Abstract Recent evidence of the occurrence of beidellite in many soils around the world necessitates a better understanding of the role of charge location on the colloidal behavior of this smectite as compared to the more frequently studied montmorillonites. Clay suspension stability and sorption of an organic polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural consequences of porphyrin tautomerization. Molecular structure of a zinc isoporphyrinK. M. Barkigia, M. W. Renner, H. Xie, K. M. Smith, and J. FajerCite this: J. Am. Chem. Soc. 1993, 115, 17, 7894–7895Publication Date (Print):August 1, 1993Publication History Publ…
X-ray θ scans and high-resolution transmission electron microscopy (HRTEM) imaging indicate that the calcite of sea urchin spines and skeletal plates forms in mosaic crystals. Both coherent and incoherent boundaries were observed between slightly misaligned crystallites. Small domains show an ordered superstructure. U…
The arsenic pressure dependence of surface diffusion of Ga adatoms in molecular beam epitaxy (MBE) on (111)B-(001) mesa-etched substrates was investigated by means of in situ scanning microprobe reflection high-energy electron diffraction (µ-RHEED). It was observed for the first time that the direction of Ga adatom mi…
Abstract The mechanism of intumescence is studied in mixtures of ammonium polyphosphate (APP) with several polycondensates as a part of a systematic study of intumescent fire retardants. It is shown that APP reacts on heating with the polycondensate to form a precursor of the intumescent char which is obtained on furt…
Photodynamic therapy (PDT) of cancer is a modality that relies upon the irradiation of tumors with visible light following selective uptake of a photosensitizer by the tumor tissue. There is considerable emphasis to define new photosensitizers suitable for PDT of cancer. In this study we evaluated six phthalocyanines…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIs hole transfer involved in metalloporphyrin-catalyzed epoxidation?Taisun Kim, Gholam A. Mirafzal, Jianping Liu, and Nathan L. BauldCite this: J. Am. Chem. Soc. 1993, 115, 17, 7653–7664Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence studies of diaminodiphenyl sulfone curing agent for epoxy cure characterizationJian Cheng Song and Chong Sook Paik SungCite this: Macromolecules 1993, 26, 18, 4818–4824Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of structure and annealing on the surface composition of multiblock copolymers of bisphenol A polycarbonate and poly(dimethylsiloxane)Xin Chen, Helen F. Lee, and Joseph A. Gardella Jr.Cite this: Macromolecules 1993, 26, 17, 4601–4605Publication Date (Print):August 1,…
Abstract This paper presents an improved self‐consistent method for estimating the permeability of an aligned fiber assembly, in both longitudinal and transverse directions. In this method an insertion is assumed to include open space surrounded by densely packed fibers. This improvement allows us to describe effectiv…
Results from numerous in-reactor experiments with uranium dioxide fuel elements that contain defects in the Zircaloy cladding are reviewed. The various factors that influence the rate of physical deterioration of a defected element are examined. Experimental and theoretical investigations into the release behavior of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of one-electron oxidation of NAD(P)H and function of NADPH bound to catalaseOrn Almarsson, Ashoke Sinha, Enona Gopinath, and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1993, 115, 16, 7093–7102Publication Date (Print):August 1, 1993Publication History Published on…
Low density polyethylene (PE) and polyethylene terephthalate (PET) films were treated in air plasma of a low pressure (500 mTorr) large area microwave (2.45 GHz) discharge, or in a corona discharge at atmospheric pressure. The modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS) for their oxy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRing-opening copolymerization of optically active .beta.-butyrolactone with several lactones catalyzed by distannoxane complexes: synthesis of new biodegradable polyestersYoji Hori, Yoko Takahashi, Akio Yamaguchi, and Takao NishishitaCite this: Macromolecules 1993, 26, 16, 4388–…
Activated carbon fiber was used as a new adsorbent for direct removal of iodine and iodide compounds from acetic acid solutions under static and dynamic conditions. In aqueous solution as well as in acetic acid, methanol, or ethanol, activated carbon fiber showed excellent iodine removal efficiency, superior to that o…