BRANCHING IN THE BACTERIORHODOPSIN PHOTOCHEMICAL CYCLE

Abstract— Kinetics have been determined for the decay of the terminal phototransients M(410) and O(660) and the reappearance of the BR(570) chromophore in flash-photolyzed aqueous suspensions of light-adapted purple membrane fragments from Halobacterium halobium . The results were fitted to a linear model of     

Complex solid state physical investigations of metal layers on plastics

Several plastics were coated with different metal layers. Different plasma etching methods of plastics were used before deposition of metal layers. The adhesion strength depends on etching methods. With XPS it was shown that different bonds between C-C, C-H, C-Cl and C-O are existing. With X-ray diffraction methods it was found that decreasing peak intensities depend on increasing adhesion strengths.     

Percolative Phenomena in Microemulsions of the ‘One-Component Macrofluid’ Type

The temperature dependence of the water self-diffusion coefficients (D), as well as those of low- and high-field (stationary and time-dependent) specific conductivities (K), have been determined in the percolation regime of ternary mixtures of water, AOT, and oil. For the first time a pronounced similarity in the behavior of D and κ was detected giving instructive hints about the large variations in the specific conductivities of these systems. Results from kinetic and stationary experiments are consistent with a network-structure model of micro phases in the percolation regime in which the micro phases retain their discrete character.     

Lokalisierte intermolekulare Induktionswechselwirkung endlicher Dipole mit apolaren Lösungsmittelmolekeln: Die Deutung temperaturabhängiger Dipolmomente von Carbonyl- und Thionderivaten der 1,2-Dithiacyclopentene

Solute-solvent interactions of the 1,2-dithiacyclopentenones and the analogue dithiathiones with non-polar solvent molecules as well as the formation of hetero-association complexes of these compounds is attributed to localized electrostatic induction. The distribution of the electric field around the oxo and thiono groups, respectively, is of special importance in determining the strength of the association. The temperature dependent solute-solvent interactions are correlated with changes in the observed dipole-moments. A plausible quantitative model based on finite dipole-moments is proposed in order to interpret the fundamental process of association.     

Secondary ion mass spectrometry of nucleic acid components: Pyrimidines,purines, nucleosides and nucleotides

Biologically important involatile organic compounds including nucleotides, nucleosides, purines and pyrimidines have been analysed by secondary ion mass spectrometry. For the emission of molecule-like secondary ions small amounts of the substances were deposited as thin layers on silver foils and bombarded with 3 keV [AR]⁺ ions. All the compounds investigated yielded intense molecular ions of the general composition [M±H]^± and [M + Ag]⁺, but only a few characteristic fragment ions due to simple bond cleavages. Similarities and differences as compared with spectra obtained by other mass spectrometric ionization techniques are illustrated and discussed.     

HPLC-SIMS off-line coupling for the determination of 8-hydroxyquinolinates and some other metal chelates

Summary The 8-hydroxyquinolates (oxinates) of Ru, Rh, Pd, Os, Ir, Pt, V, Cr, Mo, W, and Cr- and Hg-2,2,7-trimethyloctane-3, 5-dionates have been investigated and characterized with SIMS. For off-line coupling peak fractions from HPLC separations have been used to study and demonstrate the applicability of SIMS as a detection and characterization method in HPLC.

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HPLC-SIMS Off-line Kopplung zur Bestimmung von 8-Hydroxychinolaten und einigen anderen Metallchelaten