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High pressure luminescence studies have been made on several tris rare earth betadiketonates. From this information the pathway for intramolecular energy transfer between ligand and rare earth ion localized levels is clearly established. The emission from europium dibenzoylmethide (EuDBM) and europium thenoyl-triflnor…
A mutant of Saccharomyces cerevisiae that was selected for resistance to carbon catabolite repression also had reduced hexokinase activity. Hexokinase isoenzymes were purified from mutant and wild type cells. The specific glucokinase and hexokinase isozyme PI were present at normal levels in mutant and wild type, but…
The dielectric function e(q, ω) for liquid water is determined from an insulator model with parameters fixed by available optical data. Ionization of the oxygen K shell is described by generalized oscillator strengths. This model dielectric function is used to calculate the stopping power of liquid water for electrons…
The collagen arrangement of different cartilages of several mammals was studied by the Picrosirius-polarization method applied to tissue sections whose proteoglycans had been previously removed by enzymatic digestion. This procedure not only increases collagen birefringency but it also enhances the optimal resolution,…
Abstract The interaction of NO 2 with a Pt(111) surface was studied by molecular beam and thermal desorption techniques. At 300 K NO 2 adsorbs dissociatively into NO ad + O ad with an initial sticking coefficient s o = 0.97. s o decreases slightly with increasing surface temperature; the variation of the sticking coef…
A theory of glasses at low temperatures is presented. The structure of glasses contains topologically stable Z2 line defects - in continuous random networks, they are uninterrupted lines threading through odd-numbered rings of bonds - which are represented as punctures in an otherwise continuous space. The overall hom…
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Binary phase transmission gratings exhibiting a certain number N of central diffraction orders of equal intensity can be used to construct star couplers of the 1-to-N and N-to-N type. The calculation of the grating's groove structure is described, and first experimental results are presented.
Culture properties of bovine aortic endothelial cells and bovine aortic smooth muscle cells have been examined in relation to collagen gels. Endothelial cells grown on collagen maintain typical monolayer morphology not only in relationship to the overlying medium but also with respect to the collagen substrate. Endoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural effects on the photopolymerization of bilayer membranesEncarnacion Lopez, David F. O'Brien, and Thomas H. WhitesidesCite this: J. Am. Chem. Soc. 1982, 104, 1, 305–307Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands. Variation of magnetic exchange interaction in a series of heterobinuclear CuII-MII complexesSusan L. Lambert, Clifford L. Spiro, Robert R. Gagne, and David N. HendricksonCite this: Inorg. Chem. 1982, 21, 1, 68–72Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(Tetrabenzoporphyrinato)nickel(II) iodide. A doubly mixed valence molecular conductorJens Martinsen, Laurel J. Pace, Terry E. Phillips, Brian M. Hoffman, and James A. IbersCite this: J. Am. Chem. Soc. 1982, 104, 1, 83–91Publication Date (Print):January 1, 1982Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties and crystal structure of (2,3-pyrazinedicarboxylato)copper(II) hydrochloride: a pyrazine bridged ferromagnetic linear chainCharles J. O'Connor, Cheryl L. Klein, Richard J. Majeste, and Louis M. TrefonasCite this: Inorg. Chem. 1982, 21, 1, 64–67Publication…
We study, for directional solidification or fusion of binary mixtures, the stability of planar fronts against one-dimensional deformations. We extend the perturbative approach of Wollkind and Segel to the case where solute diffusion in the « daughter » phase in non-negligible. We study the bifurcation diagram and calc…
The mechanism by which photoreceptor cells in the eyes of higher animals absorb light, giving rise to receptor potentials that initiate the visual process, is a subject of active research in biophysics today. The pace of this research and its multidisciplinary nature have made it difficult for the nonexpert to keep ab…
Concentrated polystyrene latices form strongly interacting systems, and under appropriate conditions of particle radii, volume fraction and ionic strength the repulsive forces can be strong enough to give rise to measurable viscoelastic behaviour. In this paper an experimental investigation of the viscoelastic behavio…
The specific heat of the organic superconductor (TMTSF)2ClO 4 has been measured between 0.4 and 2 K. A large anomaly of the electronic contribution at 1.22 K has been attributed to the onset of three-dimensional superconducting order. There is a large magnetic field dependence of the electronic contribution above 1.22…
Shear-modulus data for polystyrene latices at various volume fractions and sodium chloride concentrations are compared with a simple model based on the theory of interaction between electrical double layers. Stress relaxation and low shear-rate viscosity are also discussed in the context of particle interaction forces.
Frustration is produced in crystals of the KDP family by mixing ferroelectric and antiferroelectric constituents. Birefringence and dielectric measurements are reported for 0 ≤ x ≲ 0.35. They indicate an interesting phase diagram, with a glassy phase probably preceded by a mixed phase for the upper part of the concent…
In Wyoming Bentonite the ion-exchange reactions for the homovalent pairs Ag(en)+2–Cs+ and Cu(en)2+2–Ca2+ and for the heterovalent pair Ag(en)+2–Cu(en)2+2 are characterized by ΔG⊖ values of exchange which are very much larger than those for the aqueous metal ions. These effects, which emphasize the importance of ion–li…