How Bern Porter Saw the World

Exact Combinatorics of Bern - Kosower - type Amplitudes for Two - Loop Φ 3 Theory

Counting the contribution rate of a world-line formula to Feynman diagrams in φ theory, we explain the idea how to determine precise combinatorics of Bern-Kosower-like amplitudes derived from a bosonic string theory for N -point two-loop Feynman amplitudes. In this connection we also present a method to derive simple and compact world-line forms for the effective action. PACS: 11.15.Bt; 11.55.-...

Development of the "GeneSYS" database system to support trial data capture and conduct

The Stringency Of Environmental Regulations And Technological Change: A Specific Test Of The Porter Hypothesis

Clusters and the new economics of competition.

Economic geography in an era of global competition poses a paradox. In theory, location should no longer be a source of competitive advantage. Open global markets, rapid transportation, and high-speed communications should allow any company to source any thing from any place at any time. But in practice, Michael Porter demonstrates, location remains central to competition. Today's economic map ...

Procerenone: a Fatty acid Triterpenoid from the Fruit Pericarp of Omphalocarpum procerum (Sapotaceae)

Phytochemical investigation of a dichloromethane-methanol (1:1) extract of the fruit pericarp of Omphalocarpum procerum which exhibited antiplasmodial activity during preliminary screening led to the isolation of the new fatty ester triterpenoid 3β-hexadecanoyloxy-28-hydroxyolean-12-en-11-one (1), together with five known compounds 2-6. The structure of the new compound as well as those of the ...