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。
The expression of fumarate reductase in Escherichia coli has been amplified over 30-fold by utilizing a recombinant plasmid, pFR63 , carrying the fumarate reductase operon. More than 50% of the inner-membrane protein could be accounted for by the enzyme, whereas the total amount of protein associated with the membrane…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence from picosecond transient absorption and kinetic studies of charge-transfer states in copper(II) porphyrinsDongho Kim, Dewey Holten, and Martin GoutermanCite this: J. Am. Chem. Soc. 1984, 106, 10, 2793–2798Publication Date (Print):May 1, 1984Publication History Publ…
Compositions in the series Na 1+x Zr 2 P3‐ x Si x O 12 and Na 1+4z Zr 2 ‐ z P 3 O 12 , where x = 0≤x≤1 and z=0≤z≤1/2, have thermal expansions that can be controlled (by selecting the composition) to values in the range <10×10 ‐7 in a temperature regime of a few hundred degrees. The lowest a values were obtained for…
A method of forming a laser damage resistant wide-spectrum antireflective coating on fused silica and other glasses has been developed. The single-layer graded-index coating is deposited from a specific polymer solution which is converted to a porous SiO2 film. The size of the pores in the film is first reduced by hea…
50 keV Ar + or focused Au + were irradiated in a trimethyl aluminum atmosphere to investigate characteristics of ion beam assisted deposition. About 80 nm thick films were deposited at a dose of 1×10 16 /cm 2 . The film composition and its depth dependence was measured by Auger electron spectroscopy. It was found that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel clathrate design: selective inclusion of uncharged molecules via the binaphthyl hinge and appended coordinating groups. X-ray crystal structures and binding modes of 1,1'-binaphthyl-2,2'-dicarboxylic acid host/hydroxylic guest inclusionsEdwin Weber, Ingeborg Csoregh,…
The quasi-one-dimensional compound CuMn${({\mathrm{S}}_{2}{\mathrm{C}}_{2}{\mathrm{O}}_{2})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}7.5${\mathrm{H}}_{2}$O was synthesized, and its magnetic susceptibility ${\ensuremath{\chi}}_{M}$ was measured in the temperature range $T=4.2\ensuremath{-}240$ K. The curve ${\ens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleModel catalytic studies over metal single crystalsD. Wayne GoodmanCite this: Acc. Chem. Res. 1984, 17, 5, 194–200Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1 May 1984https://pubs.acs.org/doi/10.1021/ar00101a007https://doi.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTForces between two adsorbed poly(ethylene oxide) layers in a good aqueous solvent in the range 0-150 nmJacob Klein and Paul F. LuckhamCite this: Macromolecules 1984, 17, 5, 1041–1048Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published i…
The continuous sequence of 2.3 kilobases in a 3-kilobase DNA fragment encoding the structural gene for coliphage T4 thymidylate synthase (5,10-methylenetetrahydrofolate:dUMP C-methyltransferase, EC 2.1.1.45) was determined by using the M13 dideoxy chain-termination method. From the coding information within this gene…
We model, in an elementary way, the excited electronic states of semiconductor crystallites sufficiently small (∼50 Å diam) that the electronic properties differ from those of bulk materials. In this limit the excited states and ionization processes assume a molecular-like character. However, diffraction of bonding el…
Abstract The natural HFA soaps present in ammoniated NR latex concentrates are derived from the hydrolysis of the saponifiable lipids on the surfaces of the latex particles. A method based on cold extraction of the soaps has been developed for determining the natural HFA soaps in freshly concentrated latices. This met…
Abstract In a new, one‐step synthesis, polyglycolide was prepared by the reaction of bromo‐ or chloroacetic acid with triethylamine in a nitromethane solution. It was discolored, by iodoacetic acid possibly as a result of iodine formed by the decomposition of triethylammonium iodide. The structure of polyglycolide was…
The preparation, magnetic and thermal properties, electronic and infrared spectra, and molecular structure of poly-bis(μ-di-n-hexylphosphinato)copper(II) are described. Crystals of the compound are triclinic, a = 9.800(3), b = 12.336(6), c = 13.352(8) Å, α = 88.53(3), β = 74.02(4), γ = 82.33(3)°, Z = 2, space group [F…
Abstract By the use of a perfectly mixed model and an imperfectly mixed one for lowdensity polyethylene vessel reactors, we show that increases in the initiator consumption with polymerization temperature are due to mixing limitations at the initiator feed. With all its parameters independently estimated, the imperfec…
A propagating buckle can be initiated in tubes under external pressure from localized imperfections. Once initiated a buckle will propagate with the result of flattening the tube behind it. The lowest pressure at which it can propagate is known as the propagation pressure, and it represents a characteristic pressure o…
We extend Fixman’s self-consistent phonon theory of the thermodynamic properties and fluctuations of the hard sphere crystal to an amorphous lattice. In doing so we develop a theory of lattice vibrations in amorphous materials via a perturbation theory around the Einstein oscillator approximation. This development is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of nitroso compounds: relative ionicity of the closed and open formsC. D. Batich and D. S. DonaldCite this: J. Am. Chem. Soc. 1984, 106, 10, 2758–2761Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published…
The appropriateness of the National Defense Research Council (NDRC) equations for penetration and back‐face scabbing thicknesses are reevaluated using presently available test results. A nondimensional impact factor is introduced to improve the predictability of these equations. Penetration depths are estimated using…
It is generally accepted that sulfide stress cracking (SSC) failures are the result of hydrogen embrittlement. However, the evidence heretofore has been mostly circumstantial. The purpose of this paper is to provide the experimental evidence which establishes the causality of hydrogen and the contributory roles of H2S…