Materials Literature
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In cereal alpha-amylase gene promoters the cis-acting gibberellin response element (GARE) is required for increased transcription in the presence of gibberellin. In low-isoelectric point (pI) alpha-amylase gene promoters a second type of cis element, termed a coupling element, must also be present in a specific positi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Behavior of Semiflexible Diblock CopolymersChandralekha Singh, Mark Goulian, Andrea J. Liu, and Glenn H. FredricksonCite this: Macromolecules 1994, 27, 11, 2974–2986Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence studies of lanthanide ion complexes of gold and silver dicyanides: a new low-dimensional solid state class for nonradiative excited-state energy transferZerihun Assefa, George Shankle, Howard H. Patterson, and Ross ReynoldsCite this: Inorg. Chem. 1994, 33,…
The goal of this study is to acquire an understanding of the manner in which cotton yam properties (including structure) contribute to the tear resistance of woven fabrics as measured by the tongue tear test. Our approach to this overall goal is a three step process. First, we examined samples during and after failure…
A concentric optical design for a grating spectrometer is described. General aberration theory is given for a family of designs of similar form, showing close similarities with the theory for conventional concentric imagers used in microlithography. Control of stray radiation in the concentric grating spectrometer is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWeak Hydrogen-Bonding by Second-Row (PH3, H2S) and Third-Row (AsH3, H2Se) HydridesP. G. SennikovCite this: J. Phys. Chem. 1994, 98, 19, 4973–4981Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org…
The conventional method of preparing requires repeated firing to form single‐phase cubic material. When a , , , or , or is used as a reaction reagent, however, only a single firing produces single‐phase cubic material. The solid‐liquid phase reaction occurs during firing between the raw oxide materials as well as othe…
In the system ZrO 2 –Al 2 O 3 , a new method for preparing ZrO 2 solid solutions from ZrCl 4 and AlCl 3 using hydrazine monohydrate is investigated. c ‐ZrO 2 solid solutions containing up to ∼40 mol% Al 2 O 3 crystallize at low temperatures from amorphous materials. The formation mechanism is discussed from IR spectra…
A new theory to study isotropic-nematic transition is proposed. This theory requires a good knowledge of the thermodynamic properties of the isotropic phase. It allows to study nematic formation in systems possessing attractive forces. We determine isotropic-nematic equilibria for a number of hard linear models as har…
Symmetry determination of three-dimensional (usual) crystals, four-dimensional (one-dimensionally incommensurate) crystals and five- and six-dimensional crystals (quasicrystals) by convergent-beam electron diffraction is described and demonstrated using real materials. Crystal structure refinement based on the dynamic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization of Poly(ethylene oxide)-Poly(propylene oxide) Block Copolymer in Aqueous Solution: Effect of Polymer ImpuritiesPer LinseCite this: Macromolecules 1994, 27, 10, 2685–2693Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published…
Macromolecular contrast media offer potential advantages over freely diffusible agents in magnetic resonance (MR) imaging outside the central nervous system. To identify an optimum molecular weight for macromolecular contrast media, the authors studied a novel macromolecular contrast agent, gadolinium diethylenetriami…
Abstract Previous assignment of the signals in the spectra of carboxymethylcellulose, based on an incremental calculation and hence on low‐molar‐mass model substances, made determination of the partial degree of substitution fundamentally impossible because overlapping of the relevant signals was predicted. However, t…
The magnetic and Mossbauer spectral properties of hydrated and anhydrous complex salts [Fe( bpp )2] X2, where bpp = [2,6-bis(pyrazol-3-yl)pyridine] and X = PF6, BF4, Br, I, NO3, are indicative of a temperature-induced singlet (1A1) ? quintet (5T2) transition in the complex cation. The nature of the transition depends…
The effects of varying the molecular weight of gadolinium-DTPA (diethylenetriaminepentaacetic acid)-polylysine, a macromolecular magnetic resonance (MR) imaging contrast agent, on blood pharmacokinetics and dynamic tissue MR imaging signal enhancement characteristics were studied in normal rats. Blood elimination half…
The electrochemical characterization of diamond is just beginning. The study reported here deals with the growth by energy‐assisted CVD of impurity‐doped diamond electrodes (see Figure) sufficiently conductive for electrochemical measurements. The electrochemical activity of the electrodes towards various analytes, th…
Abstract Tetrafluoroethylene is copolymerized with a perfluorovinyl ether, containing a functional end group (‐SO 2 F or ‐CO 2 CH 3 ) to yield a melt fabricable precursor polymer. After fabrication into the desired shape, the polymer is treated with a solution of potassium hydroxide to convert the functional group to…
The electrical conductivity of copper has been measured in the range of densities 0.3--3 g/${\mathrm{cm}}^{3}$ and in the temperature range from 8 000 to 30 000 K. Copper wires were vaporized in glass capillaries, and the conductivity measured in the 1-\ensuremath{\mu}s interval after vaporization began, and before th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigations of Graphitic Overlayers Formed from Methane Decomposition on Ru(0001) and Ru(11.hivin.20) Catalysts with Scanning Tunneling Microscopy and High-Resolution Electron Energy Loss SpectroscopyMing-Cheng Wu, Qiang Xu, and D. Wayne GoodmanCite this: J. Phys. Chem. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Nodularins: A General Method for Structure AssignmentMichio Namikoshi, Byoung Wook Choi, Ryuichi Sakai, Furong Sun, Kenneth L. Rinehart, Wayne W. Carmichael, William R. Evans, Phillip Cruz, Murray H. G. Munro, and John W. BluntCite this: J. Org. Chem. 1994, 59, 9, 2349–2…