Materials Literature
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The pH dependence of the kinetic parameters of pepsin, rhizopuspepsin, and their active-site hydrogen bond mutants has been determined. These data have permitted the calculation of two active-site ionization constants in the free enzymes (pKe1 and pK32) and in the enzyme-substrate complexes (pKes1 and pKes2). The pKe1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtom-based modeling of amorphous 1,4-cis-polybutadieneYong Li and Wayne L. MatticeCite this: Macromolecules 1992, 25, 19, 4942–4947Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/d…
The gas-phase interstitial modification of rare-earth intermetallics is studied. Net reaction energies for nitrogen in Sm/sub 2/Fe/sub 17/ and Nd(Fe/sub 11/Tl) are U/sub 0/=-57 kJ/mole and U/sub 0/=-51 kJ/mole, respectively. The equilibrium nitrogen concentration is calculated as function of temperature and gas pressu…
Dielectric properties of two-phase mixture systems including rutile (TiO 2 ) have been investigated. One of its binary compounds-MnTiO 3 , ZnTiO 3 , PbTiO 3 and Al 2 TiO 5 -was chosen as the second component. Dielectric constants ε r and their temperature coefficients τ e were first examined at 1 MHz. Dielectric prope…
Kinetic intermediates in protein folding are short-lived and therefore difficult to detect and to characterize. In the folding of polypeptide chains with incorrect isomers of Xaa-Pro peptide bonds the final rate-limiting transition to the native state is slow, since it is coupled to prolyl isomerization. Incorrect pro…
The backbone dynamics of the uniformly 15N-labeled ribonuclease H (RNase H) domain of human immunodeficiency virus (HIV-1) reverse transcriptase have been investigated using two-dimensional inverse-detected heteronuclear 15N-1HNMR spectroscopy. 15N T1, T2, and nuclear Overhauser enhancement (NOE) data were obtained fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of bis[1,2,5]thiadiazolo-p-quinobis(1,3-dithiole) (BTQBT) and its derivatives. Novel organic semiconductorsYoshiro Yamashita, Shoji Tanaka, Kenichi Imaeda, Hiroo Inokuchi, and Mizuka SanoCite this: J. Org. Chem. 1992, 57, 20, 5517–5522Publication D…
Thermal decomposition of aluminum sec ‐alkoxide in inert organic solvents at 300°C yielded a product composed of agglomerates of 4‐ to 20‐nm particles having the χ‐alumina structure. The χ‐alumina was stable and maintained a surface area above 100 m 2 /g until its transformation at 1150°C to α‐alumina.
Abstract The silicate layers of montmorillonite clay were pillared with SiO2–TiO2 sol particles. Although only the SiO2 sols were negatively charged, the SiO2–TiO2 mixed oxide sols were positively charged and could be ion-exchanged with the interlayer cations of montmorillonite. The resulting pillared clays had a basa…
Rotational hysteresis loss analysis has been carried out for CoCrTa, CoNiPt, and CoCrPt thin-film media to evaluate the influence of microstructure on coercive force through the measurement of magnetic anisotropy. In each medium, the magnitudes of H/sub k//sup grain/ defined as a magnetic field where rotational hyster…
Oxygen planes of clay minerals are formed by a continuous linkage of [SiO4]4- tetrahedra. This plane determines many of the clay colloidal and surface properties. The dπ-pπ bond between O and Si in Si-O-Si and Si-O-Al groups is described here according to the valence bond treatment. Partial π interaction between O and…
Liposome entrapment of doxorubicin has been shown to reduce its cardiotoxicity in vivo and increase its therapeutic index. A further improvement in therapeutic index could be achieved through targeting of liposome-entrapped drug selectively to cancer cells. Monoclonal antibodies against the squamous lung cancer cell l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCubic nonlinear optical properties of Group 4 metallocene halide and acetylide complexesLori K. Myers, Charles Langhoff, and Mark E. ThompsonCite this: J. Am. Chem. Soc. 1992, 114, 19, 7560–7561Publication Date (Print):September 1, 1992Publication History Published online1 M…
Heteroepitaxial SrTiO 3 films of perovskite structure with thicknesses of 46 to 184 nm were prepared by rf magnetron sputtering, holding substrate temperature at 400°C, on Pt films which were also epitaxially grown on a MgO(100) substrate in advance. The relative dielectric constant was estimated to be more than 300,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization by physisorption of a new class of microporous adsorbents: pillared claysM. Safdar Baksh, Eustathios S. Kikkinides, and Ralph T. YangCite this: Ind. Eng. Chem. Res. 1992, 31, 9, 2181–2189Publication Date (Print):September 1, 1992Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTentacle porphyrins: DNA interactionsLuigi G. Marzilli, Gabor Petho, Mengfen Lin, Min Sook Kim, and Dabney W. DixonCite this: J. Am. Chem. Soc. 1992, 114, 19, 7575–7577Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1…
Si 3 N 4 /SiC composites are ceramic materials that exhibit excellent performance for high‐temperature applications. Prepared from an ultrafine amorphous Si‐C‐N powder, sintered materials are constituted mainly of a β ‐Si 3 N 4 matrix with SiC inclusions and have a very small grain size (less than 1 μm). Such a micros…
At room temperature, the structures of TaTe4 and NbTe4 are modulated by the presence of a charge-density wave which in the former compound is commensurate with the parent lattice and in the latter incommensurate. In addition, a series of incommensurate mixed crystals ( Tal-xNbx )Te4 (0 = x =) exist in which the modula…
In order to investigate the melt undercooling and the non‐equilibrium solidification of crystalline Fe 5 wt.% Si melt spun ribbons, produced by planar flow casting (PFC), high speed temperature measurements and appropriate process simulations have been performed. Using a rotating fibre optical system with a fast respo…
Abstract The IR spectra of AgNO 3 were recorded using single‐crystal samples and polarized radiation. More detailed information was obtained than that reported in previous studies using polycrystalline samples. The very strong IR absorption bands of the ν 3 and ν 2 modes were studied by polarized reflection measuremen…