Résumé
Cassava (Manihot esculenta Cranzts) plants fed upon by whitefly Bemisia tabaci showed increased levels of pathogenesis-related (PR) proteins, such as beta-1, 3-glucanase, peroxidase and chitinase activities, as compared to uninfested plants. The enzymes increased in specific activities from 2 to 7 fold and protein content in leaf extracts decreased in whitefly-infested plants, compared to uninfested plants. Among the three PR proteins, B. tabaci feeding induced significantly higher beta-1, 3-glucanase activities, when compared with other two PR proteins. Study also discussed the possible application of PR proteins in whitefly control program.
Sujets)
Animaux , Chitinase/biosynthèse , Geminiviridae/pathogénicité , Glucan 1,3-beta-glucosidase/biosynthèse , Hemiptera/pathogénicité , Manihot/métabolisme , Myeloperoxidase/biosynthèse , Maladies des plantes/parasitologie , Protéines végétales/biosynthèseRésumé
The herb Desmotrichum fimbriatum Bl. (family: Orchidaceae), sold as Jibanti in West Bengal, is used in 'Rasayana therapy' in Ayurveda. Its effect on the modulation of the two antioxidant enzymes peroxidase and catalase has been studied in mice liver during 'cold water swim' (CWS) stress using appropriate controls. The drug, i.e. the aqueous ethanolic extract of the herb (whole plant) was found to increase peroxidase titre in the hepatic cells of normal mice. But in the stressed group, the drug displayed no effect on the peroxidase content, while it elicited an elevation of the catalase content. infinity-Tocoferol was used as the standard drug. These data suggested that the drug can ameliorate the peroxidative damage caused in mice by CWS stress.
Sujets)
Magnoliopsida , Animaux , Antioxydants/pharmacologie , Catalase/biosynthèse , Induction enzymatique/effets des médicaments et des substances chimiques , Foie/effets des médicaments et des substances chimiques , Mâle , Médecine ayurvédique , Souris , Myeloperoxidase/biosynthèse , Phytothérapie , Extraits de plantes/pharmacologie , Plantes médicinales , Stress physiologique/traitement médicamenteuxRésumé
The response in a single cell bears remarkable similarity to the effects of age on the decrements in response of many organ systems, the neutrophil offer a unique opportunity to examine the effects of aging on cellular function. Forty males of different ages were studied and divided into 4 groups, each consists of 10 subjects. Twenty elderly individuals above the age of 60 years, 10 presented with variety of infections and 10 without, compared with 20 young individuals, their ages between 20-40 years, 10 presented with the same varieties of infection and 10 without as control