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Subtilisins are extracellular seryl-proteases produced by bacilli (Markland and Emil, 1971). In addition to signal sequences, these proteases have N-terminal extensions (pro-regions) which have also been identified in several other proteases (Silen et al., 1988; Vasantha et al., 1984; Polhner et al., 1987; Henderson e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of catalytically important palladium complexes studied by photoelectron spectroscopyF. Boekman, A. Gogoll, L. G. M. Pettersson, O. Bohman, and H. O. G. SiegbahnCite this: Organometallics 1992, 11, 5, 1784–1788Publication Date (Print):May 1, 1992Publicati…
Abstract The fast luminescence, the transient absorption spectra, and the recombination kinetics are observed and investigated in α‐Al 2 O 3 . Absorption spectra reveal short‐lived bands at 2.75 and 2.15 eV. Their decay times remain the same (30 to 200 ns) in the temperature interval 80 to 293 K. They are found to be…
Archimedian spiral wave instabilities have been discovered in chemical [1] and biological systems [2]. We present here the first example of such an instability pattern, encountered in a physical medium [3]. This instability is directly observed by polarized optical microscopy, on a positive dielectric anisotropy smect…
Cast iron balls have been used for decades as a grinding media in all types of grinding applications. Early applications of cast iron grinding balls in mineral processing operations were disastrous due to spalling and premature breakage. Better control and understanding of a high chromium cast iron metallurgical syste…
The dielectric properties of a high-tilt-angle chiral-nematic--smectic-${\mathit{C}}^{\mathrm{*}}$ phase ferroelectric liquid crystal are studied in the frequency range of 30 Hz to 1 MHz. Measurements of electric permittivity at different temperatures and biasing fields were taken in thin homogeneously aligned samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand isomerism and stacking in square planar platinum(II) complexesM. J. Coyer, M. Croft, J. Chen, and R. H. HerberCite this: Inorg. Chem. 1992, 31, 10, 1752–1757Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992h…
Within the framework of the European DEMO blanket study programme, this paper describes the design work performed on the “box-shaped” concept for water-cooled Pb-17Li blankets in the past two years. The first part of the paper describes the general design, and the thermo-mechanical and neutronical analyses of the main…
The spatial distribution of the total energy is used to determine the magnetic behavior of ferromagnetic single crystals. For a single ferromagnetic domain there exists only a homogeneous magnetization the direction of which must correspond to a minimum energy direction. Magnetization curves are calculated by observin…
Conducting organic materials have drawn considerable attention due to the exciting possibilities of creating metallike conductivity and superconductivity and the potential applications of their interesting electrical, optical, and magnetic properties. The discovery of metallic conductivity in molecular organic systems…
Both magnetoelastic and neutron-diffraction studies have been performed on Cr-Al single crystals containing 1.2, 1.9, and 2.6 at. % Al. These concentrations lie in a controversial region of the magnetic phase diagram. For the crystals containing 1.2 and 1.9 at. % Al the transition at the N\'eel point is from a paramag…
Abstract Pressure relief venting of a runway reaction with gas generation is examined in terms of the overall system response and the associated venting requirement. This article presents an exact formulation as well as an approximate analytical approach. The latter is shown to be particularly useful in vent‐sizing ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTechnetium complexes of tripodal oxygen donor ligandsJohn Anthony Thomas and Alan DavisonCite this: Inorg. Chem. 1992, 31, 10, 1976–1978Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1…
Abstract The reported Raman spectra of the tetragonal [lead chlorofluoride‐type structure, D ‐P4/nmm (ITC No. 129)] lanthanide oxychlorides are inconsistent. Nuclear site symmetry analysis predicts six Raman bands. Five peaks are consistently observed, whereas the sixth remains controversial. Also, two different sets…
Abstract Continuous fertilization with NH 4 and phosphate fertilizers often has profound effects on the chemistry of soils. The resulting decreased pH and increased orthophosphate activities can impact the solid‐ and solution‐phase equilibria. The objective of this study was to determine the effect of long‐term fertil…
ABSTRACT This paper reviews: (1) Navy sponsorship of pitch graphite fiber development, and (2) assesses the impact of the high thermal conductivity fibers on future Navy applications. Navy exploratory development programs (6.2) have revealed potential applications in advanced systems for graphite fiber reinforced comp…
Ti-tritides containing about 10% (H/M) tritium were aged at 300 and 550[ddot]C for several weeks and then inspected for 3He bubble formation by transmission electron microscopy. Micrographs of α-phase regions aged at 300[ddot]C displayed platelike He precipitates on (0001) habit planes accompanied by very strong contr…
Two methods are developed for the theoretical determination of a conformational path between two well-documented forms, a closed form and the open form [Remington et al. (1982) J. Mol. Biol. 158, 111-152] of pig heart citrate synthase, a dimeric enzyme of 2 x 437 residues. The first method uses the minimization of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of interphases between PMDA/4-BDAF polyimides and silver substrates using surface-enhanced Raman scattering and reflection-absorption infrared spectroscopyW. H. Tsai, F. J. Boerio, and K. M. JacksonCite this: Langmuir 1992, 8, 5, 1443–1450Publication Date (P…
Conventional tiling models of quasicrystals imply the existence of two or more elementary cells (tiles). A new approach is proposed that allows a quasicrystal to be thought of as a random assembly of identical interpenetrating atomic clusters. This model is shown to be equivalent to a decagonal binary tiling. On apply…