Au-based catalysts have great potential because of their unique activity and selectivity for a variety of important reactions. The special catalytic properties of supported Au nano-particles depend critically upon the particle morphology, i.e. size, shape and thickness, as well as support effects. This paper reviews the current understanding of CO oxidation on supported Au catalysts. The electr...

In continuing with the research program initiated by Llored and Harré of exploring the part/whole (mereological) discourses of chemistry, we analyse Quantitative Structure-Activity Relationships (QSAR) studies, which are widespread approaches for modeling substances’ properties. The study is carried out by analyzing a particular QSAR model, and it is found that different mereologies are needed:...

ABSTRACT Coumermycin A1 was early recognized as a potentially useful antibiotic because of its very good spectrum of activity against gram-positive organisms (particularly against staphylococci), in addition to appreciable activity against a variety of gram-negative bacteria. However, in spite of its excellent in vitro activity, the insoluble character of coumermycin A1 made parenteral administ...

Insects make up the largest and most diverse group of organisms on earth with several million species to exist in total. Considering the sheer number of insect species and the vast variety of ways they interact with their environment through chemistry, it is clear that they have significant potential as a source of new lead molecules. They have adapted to a range of ecological habitats and exhi...

The activities of eight cytokinins in promoting callus growth were tested In two Phaseolus genotypes, P. vulgaris L. var. Great Northern, and P. lunatus L. var. Kingston. The structural feature which contributes to the major genotypic difference in cytokinin structure-activity relationships is the presence or absence of a double bond at the 2,3position of the isoprenoid Nf side chain. In Kingst...

prepared by stirring a mixture of 1 with the corresponding carboxylic acid (1.1 equiv.) in the presence of dicyclohexylcarbodiimide (DCC) (1.1 equiv.) and 4-dimethylaminopyridine (DMAP) (0.1 equiv.) in CH2Cl2 at room temperature for 24 hours. The crude products, obtained after usual work up, were purified by preparative TLC on silica gel (Article No. 13794, E. Merck) using CHCl3 MeOH (9:1) as t...