University of Córdoba (Spain)

About: University of Córdoba (Spain) is a education organization based out in Cordova, Spain. It is known for research contribution in the topics: Population & Catalysis. The organization has 12006 authors who have published 22998 publications receiving 537842 citations. The organization is also known as: University of Córdoba (Spain) & Universidad de Córdoba.

Stomatal and photosynthetic responses of olive (Olea europaea L.) leaves to water deficits

Abstract: The leaf gas exchange of mature olive trees ( Olea europaea L.) was characterized over a wide range of water deficits in the field during 1998, in Cordoba, Spain. Leaf photosynthesis ( A ) and stomatal conductance ( g l ) responded diurnally and seasonally to variations in tree water status and evaporative demand. In the absence of water stress, A and g l were generally high during autumn and low in days of high vapour pressure deficits (VPD). Leaf A varied between 0 and 2 µ mol m − 2 s − 1 under severe water deficits that lowered the stem water potential ( Ψ x ) to − − − 8·0 MPa, but recovered rapidly following rehydration. Transpiration efficiency (TE) was curvilinearly related to VPD and not influenced by water deficits except in cases of severe water stress, where low TE values were observed at Ψ Ψ Ψ x below − 4 MPa. Three models of leaf conductance were calibrated and validated with the experimental data; two were based on the model proposed by Leuning (L) and the other was derived from the widely used Jarvis (J) model. The L models performed better than the J model in two validation tests. The scatter of the predictions and the limited accuracy of all three models suggest that, in addition to the physiological and environmental variables considered, there are additional endogenous factors influencing the g l of olive leaves.

A Mediterranean and a high-carbohydrate diet improve glucose metabolism in healthy young persons

Abstract: Aims/hypothesis: Insulin resistance usually precedes the diagnosis of Type II (non-insulin-dependent) diabetes mellitus. However, in most patients, the clinical expression of the disease could be prevented by dietary and lifestyle changes. We investigated the effects of a diet enriched in monounsaturated fatty acids (Mediterranean diet) and a low fat, high-carbohydrate diet on in vivo and in vitro glucose metabolism in 59 young subjects (30 men and 29 women).