| noll of rhizobium sp. strain ngr234 is required for o-acetyltransferase activity. | following (iso)flavonoid induction, nodulation genes of the symbiotic nitrogen-fixing bacterium rhizobium sp. strain ngr234 elaborate a large family of lipooligosaccharidic nod factors (nodngr factors). when secreted into the rhizosphere of compatible legumes, these signal molecules initiate root hair deformation and nodule development. the nonreducing glucosamine residue of nodngr factors are n acylated, n methylated, and mono- or biscarbamoylated, while position c-6 of the reducing extremity i ... | 1999 | 9922261 |
| screening of some indigenous qatari medicinal plants for antimicrobial activity. | aqueous, ethanol and butanol crude extracts of the aerial parts of ten plants exhibited variable degrees of antimicrobial activity against four bacterial and two fungal species. aqueous extracts had low antimicrobial activity against e.coli, p.aeruginosa, b. cerreus, s.aureus, c.albicans and a.flavus. avicennia marina (am) aqueous extract exhibited a moderate antifungal activity. ethanol and butanol crude extracts exhibited an improved antimicrobial activity. however, butanol exhibited a superio ... | 2002 | 12458480 |