Crotamines 1 and 2 differ only at residue 19 (which is Leu in 1, and Ile in 2), but 1 presents a greater myonecrotic activity. PM3 geometry optimizations of fragments of 1 (I17-C18-L19-P20-P21) and 2 (I17-C18-I19-P20-P21) yielded the minimum energy conformations I-a and II-a, respectively. The HF and DFT calculation of chemical properties (atomic charge, orbital population, and MO energy) of I-...

We have reevaluated the constraints on the Lyman continuum emission from four starburst galaxies observed with the Hopkins Ultraviolet Telescope (HUT) during the Astro-2 mission. Applying a detailed model of the absorption by interstellar gases in our Galaxy, and using the latest HUT data products, we find upper limits to the redshifted Lyman continuum that are less restrictive than those repor...

Rat liver 5 S ribosomal RNA was oxidized with periodate and coupled by its 3' terminus to Sepharose 4B through an adipic acid dihydrazide spacer. The ribosomal proteins that bind to that nucleic acid were isolated by affinity chromatography and identified by electrophoresis in polyacrylamide gels. The eukaryotic 5 S rRNA binding proteins were L6 and L19: small amounts of L7, L23', L27/L27', L35...

The paper develops the argument that the long-term structural evolution of an industry depends on the evolution of a vertically-related, downstream industry. We analyse two pairs of vertically-related industries, the jet and turboprop aircraft and engine industries, since the first introduction of the jet and turboprop technologies to 1998. The paper shows that the evolutionary dynamics of the ...

The paper develops the argument that the long-term structural evolution of an industry depends on the evolution of a vertically-related, downstream industry. We analyse two pairs of vertically-related industries, the jet and turboprop aircraft and engine industries, since the first introduction of the jet and turboprop technologies to 1998. The paper shows that the evolutionary dynamics of the ...

The erbK-2 (or III K-2 or neu i gene is amplified and overexpressed in approximately one-third of cancers of the breast, stomach, and ovary. Evidence is accumulating that erbK-2 overexpression is associated with decreased survival of breast cancer patients. In an effort to understand how erbß-2overexpression might impart a more malignant potential to breast cancer cells, we have searched for e...