Light driven reactions of single physisorbed azobenzenes

We present a successful attempt of decoupling a dye molecule from a metallic surface via physisorption for enabling direct photoisomerization. Effective switching between the isomers is possible by exposure to UV light via the rotation pathway.     

Deformations of algebroid stacks

In this paper we consider deformations of an algebroid stack on an étale groupoid. We construct a differential graded Lie algebra (DGLA) which controls this deformation theory. In the case when the algebroid is a twisted form of functions we show that this DGLA is quasiisomorphic to the twist of the DGLA of Hochschild cochains on the algebra of functions on the groupoid by the characteristic class of the corresponding gerbe.     

Algebraic index theorem

We prove the Atiyah-Singer index theorem where the algebra of pseudodifferential operators is replaced by an arbitrary deformation quantization of the algebra of functions on a symplectic manifold.Partially supported by NSF Grant DMS-9101817.     

The magnetic field,force and inductance of the system consisting of a thin ellipsoidal coil and a ferromagnetic ellipsoid

The method of separation of variables has been applied to determine the magnetic field of the system consisting of a thin ellipsoidal coil and a ferromagnetic ellipsoid of revolution. The inductance and the force acting between the coil and the ellipsoid are also examined.     

Separation of mixtures of sodium and potassium ions by charge mosaic dialysis

Charge mosaic membranes contain a mixture of anionic and cationic elements separated by thin neutral regions. In order to maintain eloctroneutrality, the overall flux of salts from electrolytic solutions through such membranes must occur with equal transport of cationic and anionic charge. The flux rate depends on the resistivities of the exchange elements and the solution composition. It is shown that Na⁺ and K⁺ can have vastly different relative transport rates depending on the selection of the membrane formulation and the receiver composition. The effect is attributed to ionic polarization of the membrane.     

Localized orbitals,electric field gradients and diamagnetic shielding in hydrogen bonded systems

Ab-initio localized molecular orbitals are used to evaluate the diamagnetic shieldings and the electric field gradients in hydrogen bonded systems.     

Extraction chromatography of cobalt and some other metals an silica treated with a mixture of Aliquat 336 and nitroso-R-salt

Summary It was found that cobalt is strongly retained on silica treated with a mixture of Aliquat 336 and nitroso-R-salt and can be separated by column extraction chromatography from cadmium, lead, zinc, mangan, nickel, copper and iron (III) which were eluted with 0.05M solution of perchloric acid. Cobalt was quantitatively eluted with 1 M perchloric acid and subsequently determined by atomic absorption spectrophotometry Cobalt was also concentrated from very dilute aqueous solutions by frontal analysis on small columns packed with the same sorbent, eluted together with a stationary phase with methanol and subsequently determined spectrophotometrically at 466nm; in this way a 500 fold concentration of cobalt was achieved permitting the determination of cobalt at the ppb level.     

Catecholamine interaction with anionic sites—A model study

Interactions of catecholamines with acidic sites in the biophase are likely to be involved in the control of the receptors activity as well as in storage and transport mechanisms. In view of the importance of the phenomena a model study of ethanolamine–phosphate complexes was made. The electrostatic interaction energy surface was calculated in the charge density multipole expansion approximation with terms up to quadrupole. The consecutive minimal energy conformation shows the importance for the interaction with the biophase of the catechol ring steric and electronic relation to the side chain.