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 structural bovine eye lens protein alpha-crystallin was dissociated in 7 M urea and its four subunits, A1, A2, B1, and B2, were separated by means of ion-exchange chromatography. Homopolymeric reaggregates of these subunits were prepared by removal of the denaturant via dialysis. It was found that subunits were ex…
We have previously shown [Goto, Y., Calciano, L. J., & Fink, A. L. (1990) Proc. Natl. Acad. Sci. U.S.A. 87, 573-577] that beta-lactamase, cytochrome c, and apomyoglobin are maximally unfolded at pH 2 under conditions of low ionic strength, but a further decrease in pH, by increasing the concentration of HCl, refolds t…
Hydrogen passivation of deep traps in diamond is demonstrated. Current-voltage (I-V) characteristics of polycrystalline thin film and bulk diamond were studied before and after hydrogenation. On hydrogenation, all the samples showed several orders of magnitude increase in conductivity. Hydrogenation was carried out un…
Abstract Understanding the rate dependencies of the tensile strength of reinforcing fibres is a key for the understanding of the rate dependencies of the properties of the corresponding composite materials. Hence, in this study it is attempted to clarify the mechanical responses of aramid and carbon fibres at differen…
Ultraviolet photoelectron spectra (UPS) have been measured for bare unsupported copper clusters in the 1--410 atom size range as mass selected from a supersonic, negatively charged, cluster ion beam. Using an ${\mathrm{F}}_{2}$ excimer laser at 7.9 eV, the UPS patterns display the evolution of the 3d band structure as…
Theoretical and experimental results are reported which provide the first evidence for biexciton states in semiconductor quantum dots. The theory predicts an increasing biexciton binding energy with decreasing dot size. Unlike bulk semiconductors, quantum dots have excited biexciton states which are stable. These biex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitized electron-transfer reactions and hydrogen evolution in organized microheterogeneous environments: separation of ground-state xanthene-bipyridinium complexes by silica colloidsI. Willner, Y. Eichen, and E. JoselevichCite this: J. Phys. Chem. 1990, 94, 7, 3092–3…
Abstract Composite latex particles based on natural rubber latex have been synthesized to yield materials which may be formally regarded as interpenetrating polymer networks and semiinterpenetrating polymer networks. Methyl methacrylate was added to a carefully stabilized natural rubber latex and polymerized in situ u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical nonlinearities of organometallic structures: aryl and vinyl derivatives of ferroceneSaswati. Ghosal, Marek. Samoc, Paras N. Prasad, and Joseph J. TufarielloCite this: J. Phys. Chem. 1990, 94, 7, 2847–2851Publication Date (Print):April 5, 1990Publication History Publi…
Abstract Catalytic dehydrochlorination (100%) of solid poly(vinyl chloride) (PVC) in the presence of AlCl 3 at 200°C gives a product which has a similar structure to the product of catalytic dehydrochlorination of 1,2‐dichloroethane in the presence of AlCl 3 at 60°C. Both products have brown‐black color, are completel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and reactivity of bimetallic cobalt-vanadium (ConVm) clustersS. Nonose, Y. Sone, K. Onodera, S. Sudo, and K. KayaCite this: J. Phys. Chem. 1990, 94, 7, 2744–2746Publication Date (Print):April 5, 1990Publication History Published online1 May 2002Published inissue 5…
Abstract The dynamic‐mechanical properties of high density polyethylene filled with 20% by volume of untreated glass spheres or glass spheres treated with a silane‐based coupling agent were studied as a function of temperature and imposed tensile deformation. The coupling agent used is capable of providing covalent bo…
Abstract Colorless single crystals of the title compound are grown from mixtures of CsNO 3 , Sb 2 O 3 , and NH 4 H 2 PO 4 at 1173 K. The new compound belongs to the monoclinic space group C2/m with Z = 8. Its crystal structure consists of corner‐ or edge‐sharing SbO 6 octahedra and PO 4 tetrahedra linked to the octahe…
The enzymatic decarboxylation of orotidine 5'-monophosphate may proceed by an addition-elimination mechanism involving a covalently bound intermediate or by elimination of CO2 to generate a nitrogen ylide. In an attempt to distinguish between these two alternatives, 1-(phosphoribosyl)barbituric acid was synthesized wi…
The crystal structure of dihydrofolate reductase (EC 1.5.1.3) from Escherichia coli has been solved as the binary complex with NADP+ (the holoenzyme) and as the ternary complex with NADP+ and folate. The Bragg law resolutions of the structures are 2.4 and 2.5 A, respectively. The new crystal forms are nonisomorphous w…
The use of the thermoelastic martensitic transformation and its reverse transformation has recently been proposed and demonstrated for several active control ap plications. However, the present constitutive models have lacked several important funda mental concepts that are essential for many of the proposed intellige…
Recent experimental results indicate that bistability is difficult to achieve in surface-stabilized ferroelectric liquid-crystal devices with high spontaneous polarization (Ps) materials. We formulated the basic equations to analyze the bistability as a function of the conductivity and thickness of the alignment layer…
A complete analysis of the linear magnetoelectric (ME) effect is carried out which exploits the PT symmetry of the ME susceptibility tensor alpha . The existing (or 'old') theory in effect considers only the time-reversal antisymmetry of alpha , with the result that it restricts the effect to magnetic crystals. It is…
The magnetic properties of the hard magnetic 20:70:10 (ω) phase in melt-spun Sm20Fe70+xTi10−x (x=−2,0,2) and Sm25Fe65.6Ti9.4 were investigated. The intrinsic coercivity iHc and the magnetization J were measured as a function of both the melt spinning parameters and various heat treatments. The maximum coercivities iHc…
A detailed temperature dependence of the energy gap E 0 in the PbSe and PbTe was obtained from the transmittance measurements. A non-linear change of E 0 in the vicinity of the Debye temperature was noticed. An attempt to find an empirical formula describing the experimental dependence E 0 (T) led to the conclusion th…