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66941 documents, page 1 of 6695

Regiospecific synthesis of isoapocodeine from 10,11-dimethoxyaporphine by using Cunninghamella elegans.

A preparative-scale regiospecific conversion of 10,11-dimethoxyaporphine to isoapocodeine was conducted with Cunninghamella elegans ATCC 9245. This biotransformation proceeded quantitatively in suspensions and was pH dependent. The influence of antioxidants on the conversion was studied. Attempts to preserve the activity of isolated C. elegans cells by a number of methods were unsuccessful.

Observations on residual donors in GaP LPE

Electron and donor concentrations and mobilities of non doped liquid phase epitaxial GaP layers were studied when varying the annealing process prior to growth. Main donors or the presence of more than one donor were identified by donor ionization energies. After short anneallings the incorporation of sulphur, after long annealings the incorporation of silicon were observed.

Chemical Bond Approach To The Electric Susceptibility Of Semiconductors. Ii

The method previously developed to relate chemical bonds to the dielectric constant of elemental semiconductors is extended to the ionic tetrahedral III-V compounds. Expressions for the static dielectric constant and the average optical gap in terms of the generalized Wannier functions for the valence bands are obtained. Only two parameters are needed. The first is a measure of the antibonding character of the valence bands and the second is related to the ionic nature of these compounds. We ...

Adaptive Significance of Lactate Dehydrogenase B2 Isozymes in Rainbow Trout, Salmo gairdneri and a Biochemical Genetic Comparison of Cutthroat Trout (Salmo Clarki) Populations

Rainbow trout lactate dehydrogenase (LDH) B2' B2' , B2' B2" and B2" B2" phenotypes were tested under a variety of conditions for swimming endurance, oxygen consumption rates, and blood pH, p02, and lactate. The B2" B2" phenotype exhibited a lower swimming endurance, under a limited oxygen supply, than the B2' B2' and B2' B2" phenotypes. Blood pH at fatigue did not differ among the LOH phenotypes that swam under low oxygen conditions (2 mg/1). Blood p02 at fatigue was significantly higher for ...

Pinturas de Ernesto Deira: Galería Rayuela, Madrid

"Este Artículo pertenece a la sección Arte, Letras, Espectáculos. "

Structural and functional differences between the H-2 controlled Ss and Slp proteins

(1978)
Based on functional and structural data, it is concluded that the Ss protein in the mouse expresses the activity of the fourth component of complement. Removal of the Ss, but not of Slp, antigen correlates with a high degree of significance (P less than 0.001) with decrease of C4 hemolytic activity. In phenotypically Slp negative mice the plasma/serum levels of Ss correlate with the C4 activity (P less than 0.001). Structurally, Ss is a 209,000-mol wt protein, consisting of three covalently l...

Synthese en reacties van gesubstitueerde tosylmethylisocyaniden

In this thesis the synthesis and the synthetic applications of mono- and disubstituted derivates of tosylmethyl isocyanide (TosMIC, 1) are described. Chapter 1 is an introductory chapter. Chapter 2 deals with the synthesis of mono- and disubstituted derivates of 1, mainly by alkylations of the -CH2- group. ... Zie: Samenvatting.