Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The characteristic structural, textural and compositional features of the various kaolinite-rich clayrocks known as flint clay, toasted clay, kaolinite tonstein and bauxitic clay are briefly reviewed together with their mode of occurrence. It is considered that these rocks have much in common; sufficient to w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of some mixed-halide copper(II) dimers of the general formula [Cu2XnX'6-n]2- (X = chloride(1-) and X' = bromide(1])): evidence for the preference of chloride bridges in the mixed-halide speciesWilliam E. Estes, John R. Wasson, James W. Hall, and William E. H…
A simple algebraic method is presented for estimating impedance parameters for electrochemical systems that exhibit pseudoinductance. The method, which makes use of four characteristic points from the complex plane diagram, is illustrated by calculating impedance parameters for transpassive chromium in sulfuric acid.…
ABSTRACT Mytilus edulis could be adapted to salinities between 25% and 125% under laboratory conditions, with complete ionic and osmotic conformity of the body fluids. Extracellular space, intracellular cation concentrations and water content were determined for the cerebro-visceral connectives of Mytilus adapted to e…
Abstract Hg 2 P 2 S 6 kristallisiert triklin mit a = 6,252(3), b = 6,262(4), c = 7,126(6)Å, α = 96,21(6), β = 105,69(6), γ = 119,15(4)° und Z = 1 in der Raumgruppe P 1 ; Hg 2 P 2 Se 6 monoklin mit a = 6,545(3), b = 11,377(3), c = 13,610(5) Å, ß = 98,47(5)° und Z = 4 in der Raumgruppe C2/c. Dei Kristallstrukturen wurde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline beryllium hydrideG. J. Brendel, E. M. Marlett, and L. M. NiebylskiCite this: Inorg. Chem. 1978, 17, 12, 3589–3592Publication Date (Print):December 1, 1978Publication History Published online1 May 2002Published inissue 1 December 1978https://pubs.acs.org/doi/10.10…
Abstract The conformational transition of poly( L ‐agrignine) by binding with various mono‐, di‐, and polyvalent anions, especially with SO , was studied by CD measurements. The intramolecular random coil‐to‐α‐helix conformational transition and the subsequent transition to the β‐turn‐like structure was caused by bind…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2-(Trichloroacetyl)pyrroles as intermediates in the preparation of 2,4-disubstituted pyrrolesPeter Barker, Paul Gendler, and Henry RapoportCite this: J. Org. Chem. 1978, 43, 25, 4849–4853Publication Date (Print):December 1, 1978Publication History Published online1 May 2002P…
Measurements of the specific heat of FCC iron alloys reveal Schottky anomalies in the paramagnetic temperature range with the same excitation energies of about 0.1 eV that have been used in a preceding paper to describe the anomalies in thermal expansion. Magnetically ordered Fe-Ni alloys also reveal anomalies in spec…
The first series of polymeric liquid crystals with a cholesteric phase has been prepared by copolymerization of the methacrylic esters (1) and (2). Pure poly-(1) forms a nematic phase; the cholesteric structure is induced by the chiral species (2).—Pure poly-(2) is not liquid crystalline.
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Abstract The compound Mg 2+ -Al 3+ -(Fe(CN) 6 ) 4− , with a structure similar to hydrotalcite Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O, is prepared by a coprecipitation method. Chemical, thermal, and X-ray analysis of the compound lead to the formula: <mml:math xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mnf="http://cambri…
Probenecid induced major alterations in the half‐life. renal clearance, and metabolism of naproxen. In 6 healthy subjects who received 500‐mg single oral doses of naproxen alone and (following two days of probenecid loading) with 500 mg of probenecid 4 times a day, there was an increase in naproxen plasma half‐life fr…
The 10-nm filaments of baby hamster kidney (BHK-21) cells, when examined either in the form of native filament caps or polymerized in vitro, are long tubes of protein 8--10 nm in diameter. They contain about 42% alpha-helix, which, on the basis of x-ray diffraction data, is arranged in a coiled-coil conformation chara…
ABSTRACT Edaphic diatoms were collected on a seasonal basis from beneath five monospecific stands of spermatophytes on Graveline Bay Marsh (Mississippi) from 14 October 1976 through 21 June 1977. Of the 119 diatom taxa encountered. only seven were restricted to a single edaphic habitat, and five of these accounted for…
Abstract The variations in surface area of a sepiolite (Toledo, Spain) after acid and heat treatments (1 n to 5 n , HNO 3 , 110°C to 900°C for 100 h) have been studied. Surface areas have been determined from N 2 adsorption isotherms at 77 K using B.E.T., Langmuir and Dubinin-Radushkevich equations. S BET values range…
In the Van der Waals theory of liquids, very short-ranged intermolecular repulsions are approximated by hard-particle exclusions and somewhat longer-ranged intermolecular attractions are subject to a self-consistent mean-field treatment. This approach, which has recently been applied to pure nematogens, is here extend…
Ein neues, einfaches und schnelles Verfahren, das auf der Methode der Ausschluß-Chromatographie beruht, ermöglicht bei Festkörpern wie Silicagelen die Bestimmung des Porenvolumens, der spezifischen Oberfläche, des Volumens der geschlossenen Poren sowie der Porendurchmesser-Verteilung für Porendurchmesser zwischen 10 Å…
The depolarization ratios of the Raman vibrational bands from the terminal C≡N and the central C–C biphenyl link of an oriented nematic liquid crystal [p-n-pentyl-p′-cyanobiphenyl (5CB)] have been measured. The orientational order parameters 〈P2〉 and 〈P4〉 were calculated. The parameter 〈P4〉 remained far less than the…
Certain properties of vacuum-deposited thin films of a-Se were measured and compared with those of melt-quenched Se glass. After annealing in the temperature range 25–50 °C, the creep, heat capacities, and far-infrared behaviors of the vapor-deposited films were indistinguishable from those of melt-quenched specimens.…