THE PHOTOPHYSICS OF 5-METHOXYINDOLE. A NON-EXCIPLEX FORMING INDOLE: ADDITIONAL EVIDENCE FOR TWO CLASSES OF EXCIPLEXES*

Abstract— 5-Methoxyindole is a non-exciplex forming indole, and its excited state behavior is qualitatively different from that of indole and its methyl substituted derivatives. This fact supports the idea that there are two limiting classes of exciplexes, charge-transfer and dipole-dipole stabilized. The fluorescence quantum yield in water is 0.29 with a lifetime of 4.0 ns at 25d?C. The activation energy for fluorescence quenching in water is 15.9 pM 0.5 kJ/mol, which is smaller than for indole and the methyl substituted indoles which have been measured. In cyclohexane at 25d?C, the fluorescence quantum yield is 0.63 with a lifetime of 6.7 ns. The fluorescence is efficiently quenched by electron scavengers, as is the case for other indoles. Some electron ejection to solvent probably occurs in both solvents.     

Geometric Property （T）

This paper discusses“geometric property （T）”. This is a property of metric spaces introduced in earlier works of the authors for its applications to K-theory. Geometric property （T） is a strong form of “expansion property”, in particular, for a sequence （Xn） of bounded degree finite graphs, it is strictly stronger than （Xn） being an expander in the sense that the Cheeger constants h（Xn） are bounded below. In this paper, the authors show that geometric property （T） is a coarse invariant, i.e., it depends only on the large-scale geometry of a metric space X. The authors also discuss how geometric property （T） interacts with amenability, property （T） for groups, and coarse geometric notions of a-T-menability. In particular, it is shown that property （T） for a residually finite group is characterised by geometric property （T） for its finite quotients.     

Theoretical Analysis of Viscous Coupling in Two-phase Flow through Porous Media

Theoretical analysis is presented to quantify the viscous coupling effect in two-phase flow through porous media. The analysis is based on the principle of potential difference equations as well as on the interfacial contact area and partition concept. The analysis shows that viscous coupling effect is negligible throughout the normalized saturation range. The expression, Xϕ ², was developed for the quantification of the parameter that controls the amount of viscous coupling, where X was theoretically found to have a maximum value of 2.     

DECREASED HOST CELL REACTIVATION OF UV-IRRADIATED ADENOVIRUS 5 BY FIBROBLASTS FROM COCKAYNE'S SYNDROME PATIENTS

Abstract— Over a period of 5 years, we performed 29 experiments in which survival curves of UV-irradiated adenovirus were determined using fibroblast strains from 10 normal persons and from 7 persons having Cockayne's syndrome. In all of these, the survival of UV-irradiated adenovirus 5 was less when assayed using monolayers of fibroblasts from Cockayne's syndrome patients than from normal persons. Survival curves using normal fibroblasts were, within error, straight lines on a log survival vs. linear fluence plot. Survival curves obtained using Cockayne's syndrome fibroblasts showed 2 components: an initial sensitive component, reflecting the behavior of approx. 75% of the infected cells, followed by a component having normal sensitivity. In the 28 experiments that were considered reliable, 58 curves were done using Cockayne's fibroblasts, 41 using normal human fibroblasts. Although experimental variation was encountered, there was no individual case in which sensitivity as measured using Cockayne's was equal to (or less than) the sensitivity measured using normal fibroblasts.     

Unique ergodicity for horocycle foliations

The notion of unique ergodicity is extended to multidimensional foliations, and it is shown that ifg is the strong stable or strong unstable foliation of a topologically mixing basic set Ω_κ for an Axiom A diffeomorphism or flow theng is uniquely ergodic.     

Zur Bestimmung des Alkoholgehalts w?ssriger L?sungen durch den Gefrierpunkt

Ohne ZusammenfassungAus dem Chem. Laboratorium der landwirtschaftlichen Hochschule [Prof. E. Buchner] in Berlin.