The in vitro antimicrobial activity of the crude methanolic and ethanolic leaf extract of Bridelia retusa (L.) Spreng. was studied against four gram negative and two gram positive bacteria. The results showed that both the extracts showed antimicrobial activity. Maximum zone of inhibition was observed in the methanolic extract against Escherichia coli which was 29.5 ± 0.50. However, ethanolic e...

It is well known that some XML elements correspond to objects (in the sense of object-orientation) and others do not. The question we consider in this paper is what benefits we can derive from paying attention to such object semantics, particularly for the problem of keyword queries. Keyword queries against XML data have been studied extensively in recent years, with several lowest-common-ances...

A synopsis of the species of Centris subgenus Xanthemisia Moure in Colombia is presented. The species identified are Centris ferruginea Lepeletier, C. lutea Friese and C. aureiventris, a new species from the Colombian Andes. Morphological characters of both sexes, distribution records and an identification key for the three species of the subgenus that occur in Colombia are provided.