Résumé
This work aimed to study, comparatively, the flocculation of fluorite particles with Corynebacterium xerosis cells and three commercial long chain polymers. Best flocculation results were obtained with cell of C. xerosis and with an anionic polyacrylamide. Both were effective in solids removal and water clarification, although flocculation with C. xerosis cells requires a higher dosage of reagent per mass unit of processed ore.
Sujets)
Corynebacterium , Polymères/analyse , Polymères/isolement et purification , Floculation , Matière particulaireRésumé
Antimutagenic effect of 2 polyphenolic fractions isolated from T. bellerica in TA98 and TA100 strains of S. typhimurium against 2AF, NPD and 4NQNO has been characterized. Both the fractions were significantly effective against S9-dependent 2AF; less effective against NPD and almost not effective against 4NQNO in TA100 strain. Using 13C-NMR spectral analysis, the TB-3 fraction, which was significantly more effective against 2AF compared to TB-4, was found to be a mixture of 3 tannins while TB-4 was non-tannin fraction. Interaction of polyphenols with S9 proteins may be the probable cause of inhibitory effect of these polyphenols, though the possibility of other mechanisms cannot be ruled out.
Sujets)
Antimutagènes/isolement et purification , Flavonoïdes , Fruit/composition chimique , Phénols/isolement et purification , Polymères/isolement et purification , Salmonella typhimurium/effets des médicaments et des substances chimiques , Spécificité d'espèceRésumé
1. We describe a polymeric of magnesium ammonium phosphate associated with linoleic acid and a basic protein produced by Penicillium sp (strain PB-73). 2. Chemical and physical data suggest a structure characterized as an aggregated polymeric form of protein magnesium ammonium phospholinoleate anhydride. 3. The aggregated polymer has an approximate molecular weight of 316 kDa and a phosphate/magnesium ratio of 2.34
Sujets)
Acides linoléiques/composition chimique , Magnésium/isolement et purification , Penicillium/métabolisme , Phosphates/isolement et purification , Polymères/isolement et purification , Chromatographie sur gel , Protéines fongiques/composition chimique , Magnésium/composition chimique , Masse moléculaire , Penicillium/ultrastructure , Philippines , Phosphates/composition chimiqueRésumé
La inclusión de harina de habas (Vicia faba) en la dieta de animales de experimentación produce un retardo en el crecimiento, semejante al inducido por la adición de 0.2% de ácido tánico en dietas control de caseína. Tanto los extractos hidroalcohólicos obtenidos a partir de semillas de havas. Asimismo, la presencia de ácido tánico al 0.05, 0.1 y 0.2% en las soluciones de glucosa, disminuye proporcionalmente la absorción de ésta por el intestino. Los resultados en cuestión parecen sugerir que los polifenoles afectan, al menos parcialmente, el valor nutritivo d ela leguminosa (Vivia faba), si bien otros componentes d elas mismas también podrían estar involucrados