A convenient preparation of 8R,25-dihydroxy-9,10-seco-4,6,10(19)-cholestatrien-3-one

Summary The title compound was prepared in three steps from 25-hydroxyvitamin D₃. The keystep in this sequence is the transformation of3b to4 by means of the LiBr/HMPT complex.Dedicated to Prof. Dr. Karl Schlögl on the occasion of his 65th anniversary     

A Heuristic Analysis of Quantum Noise Quenching in the Two-Photon Correlated Emission Laser

We demonstrate how the two-photon correlated emission laser (CEL) can be understood from a simple physical picture in a quasirigorous fashion. We use semiclassical arguments to derive correct expressions for the phase and amplitude diffusion in a simple way. We then illustrate how noise suppression is achieved in the two-photon CEL.     

Reconstitution of apomyoglobin with bile pigments

Summary Apomyoglobin was reconstituted with bile pigments of the verdinoid, 2,3-dihydroverdinoid, pterobilinoid, and violinoid type. Absorption and circular dichroism data as well as formation constants of the complexes were measured. From these results it was concluded that chromophore binding and induced chirality of these pigments are mainly governed by a lipophilic region opposite to the propionic side chain(s) and the asymmetric position of the hydrogen bonding acceptors of the propionic acid side chain(s) at the entrance of the protein pocket.Dedicated to Prof. Dr. A. Eschenmoser on occasion of his 65th birthday     

Nachweise verwandter Elemente nebeneinander in einem Tropfen

Ohne Zusammenfassung     

Elektrolytadsorption und Aktivitätskoeffizient

Ohne ZusammenfassungHerrn Dr. K. Hoffman dankt der Verfasser fu varstandnisvolle Helfe bei den Rechnungen