Objective:To investigate the antidiabetic effect of aqueous extract of Merremia Iridentala (M.tridentala) root(MTRAE) in normal,glucose-loaded hyperglycemic and streptozotoein(STZ)induced diabetic rats.Methods:Oral ad...Objective:To investigate the antidiabetic effect of aqueous extract of Merremia Iridentala (M.tridentala) root(MTRAE) in normal,glucose-loaded hyperglycemic and streptozotoein(STZ)induced diabetic rats.Methods:Oral administration of MTRAE at the doses of 50,100 and 150 nig/kg was studied in normal,glucose-loaded and STZ-diabetie rats.The three doses caused significant reduction in blood glucose levels in all the models.Results:The effect was more pronounced in 100 and 150 mg/kg than 50 mg/kg.MTRAK also showed significaut increase in serum insulin,body weight and glycogen content in liver and skeletal muscle of STZ-induced dialietie rats while there was significant reduction in the levels of serum triglyceride and total cholesterol.MTRAE also showed significant antilipidperoxidative effect in the pancreas of STZinduced diabetic rats.The antidiabetic effect of M.tridentata was compared with glibenclamide. a well known hypoglycemic drug.Conclusions:The results indicate that aqueous extract of M. tridentata root possesses significant antidiabetic activity.展开更多
Aims Although increases in precipitation variability in arid ecosystems are projected due to climate change,the response of desert shrub communities to precipitation change has not been fully elucidated.Such knowledge...Aims Although increases in precipitation variability in arid ecosystems are projected due to climate change,the response of desert shrub communities to precipitation change has not been fully elucidated.Such knowledge is important since drought-adapted plants exhibit varied mechanisms of survival that may contribute to species coexistence.Methods We tested the responses of eight drought-adapted plants,a mix of graminoids,shrubs and forbs to three summer precipitation scenarios(1.3,2.6 and 3.9 cm per month)in a common garden experiment in the Great Basin(Owens Valley,California).Changes in mineral nutrient uptake(carbon,nitrogen,phosphorus,potassium,calcium,magnesium,manganese,copper,boron,zinc,iron and sodium)and gas exchange parameters(photosynthetic rate and stomatal conductance)were investigated in the studied species.Important Findings Two graminoids(Sporobolus airoides and Leymus triticoides)and one salt tolerant shrub species(Atriplex confertifolia)responded to increased water availability with increases in photosynthetic rate and/or stomatal conductance.There was a significant correlation between water availability and uptake of nutrients for five out of eight species.Artemisia tridentata,with higher rates of photosynthesis,contained greater amounts of potassium,copper and boron,while Juncus arcticus,with higher rates of photosynthesis,contained greater amounts of magnesium and iron,and less sodium.Juncus arcticus and three salt-adapted species(A.confertifolia,Distichlis spicata and S.airoides)exhibited correlations with stomatal conductance and concentrations of nutrients.Results indicate that differential physiological response mechanisms to increased moisture and associated nutrient uptake strategies in drought-adapted species may mediate coexistence under increased summer precipitation.展开更多
文摘Objective:To investigate the antidiabetic effect of aqueous extract of Merremia Iridentala (M.tridentala) root(MTRAE) in normal,glucose-loaded hyperglycemic and streptozotoein(STZ)induced diabetic rats.Methods:Oral administration of MTRAE at the doses of 50,100 and 150 nig/kg was studied in normal,glucose-loaded and STZ-diabetie rats.The three doses caused significant reduction in blood glucose levels in all the models.Results:The effect was more pronounced in 100 and 150 mg/kg than 50 mg/kg.MTRAK also showed significaut increase in serum insulin,body weight and glycogen content in liver and skeletal muscle of STZ-induced dialietie rats while there was significant reduction in the levels of serum triglyceride and total cholesterol.MTRAE also showed significant antilipidperoxidative effect in the pancreas of STZinduced diabetic rats.The antidiabetic effect of M.tridentata was compared with glibenclamide. a well known hypoglycemic drug.Conclusions:The results indicate that aqueous extract of M. tridentata root possesses significant antidiabetic activity.
文摘Aims Although increases in precipitation variability in arid ecosystems are projected due to climate change,the response of desert shrub communities to precipitation change has not been fully elucidated.Such knowledge is important since drought-adapted plants exhibit varied mechanisms of survival that may contribute to species coexistence.Methods We tested the responses of eight drought-adapted plants,a mix of graminoids,shrubs and forbs to three summer precipitation scenarios(1.3,2.6 and 3.9 cm per month)in a common garden experiment in the Great Basin(Owens Valley,California).Changes in mineral nutrient uptake(carbon,nitrogen,phosphorus,potassium,calcium,magnesium,manganese,copper,boron,zinc,iron and sodium)and gas exchange parameters(photosynthetic rate and stomatal conductance)were investigated in the studied species.Important Findings Two graminoids(Sporobolus airoides and Leymus triticoides)and one salt tolerant shrub species(Atriplex confertifolia)responded to increased water availability with increases in photosynthetic rate and/or stomatal conductance.There was a significant correlation between water availability and uptake of nutrients for five out of eight species.Artemisia tridentata,with higher rates of photosynthesis,contained greater amounts of potassium,copper and boron,while Juncus arcticus,with higher rates of photosynthesis,contained greater amounts of magnesium and iron,and less sodium.Juncus arcticus and three salt-adapted species(A.confertifolia,Distichlis spicata and S.airoides)exhibited correlations with stomatal conductance and concentrations of nutrients.Results indicate that differential physiological response mechanisms to increased moisture and associated nutrient uptake strategies in drought-adapted species may mediate coexistence under increased summer precipitation.
