| effects of apis mellifera propolis on the activities of streptococcal glucosyltransferases in solution and adsorbed onto saliva-coated hydroxyapatite. | propolis, a resinous hive product collected by apis mellifera bees, has been used for thousands of years in folk medicine. ethanolic extracts of propolis (eep) have been shown to inhibit the activity of a mixture of crude glucosyltransferase (gtf) enzymes in solution. these enzymes synthesize glucans from sucrose, which are important for the formation of pathogenic dental plaque. in the present study, the effects of propolis from two different regions of brazil on the activity of separate, purif ... | 2000 | 11014909 |
| effect of apis mellifera propolis from two brazilian regions on caries development in desalivated rats. | the purpose of the present study was to evaluate the effect of apis mellifera propolis collected from two regions of brazil on caries development in desalivated rats. ethanolic extracts of propolis (eep) were prepared from crude propolis samples collected in minas gerais state (mg), southeastern brazil, and rio grande do sul state (rs), southern brazil. the flavonoid composition of eep was analyzed by high-performance thin-layer chromatography (hptlc) and reversed-phase high-performance liquid c ... | 1999 | 10460964 |
| apis mellifera (hymenoptera: apidae) as a potential brassica napus pollinator (cv. hyola 432) (brassicaceae), in southern brazil. | brassica napus linnaeus is considered a self-compatible crop; however, studies show that bee foraging elevates their seed production. considering bee food shortages during the winter season and that the canola is a winter crop, this study aimed to evaluate the foraging behaviour of apis mellifera linnaeus, 1758 regarding those flowers, and to verify if it presents adequate behaviour for successfully pollinating this crop in rio grande do sul state. the study was carried out in a canola field, in ... | 2010 | 21180917 |