Climatic limitations on grassland photosynthesis over the Tibetan Plateau shifted from temperature to water.

Plant photosynthesis plays an essential role in regulating the global carbon cycle. Therefore, it is essential to understand the limitations imposed by climate on plant photosynthesis to comprehend the impacts of climate change on land carbon dynamics. In this study, taking gross primary productivity as a direct representation of photosynthesis, we employed a light use efficiency model (i.

Experimental and theoretical investigation on photodegradation mechanisms of naproxen and its photoproducts.

The photochemical degradation of the pharmaceuticals and personal care products (PPCPs) has attracted increasing attention. In this study, a deep inspection of the photolysis mechanisms of naproxen and its photoproducts has been performed by employing experimental and theoretical methods. Contributions of different reactive oxygen species (ROS, such as OH, O, and O) in the photolysis reaction also have been clarified.

Photodegradation of naproxen in water under simulated solar radiation: mechanism, kinetics, and toxicity variation.

The main objective of this study was to investigate the degradation mechanism, the reaction kinetics, and the evolution of toxicity of naproxen in waters under simulated solar radiation. These criteria were investigated by conducting quenching experiments with reactive oxygen species (ROS), oxygen concentration experiments, and toxicity evaluations with Vibrio fischeri bacteria. The results indicated that the degradation of naproxen proceeds via pseudo first-order kinetics in all cases and that photodegradation included degradation by direct photolysis and by self-sensitization via ROS; the contribution rates of self-sensitized photodegradation were 1.

[Photodegradation of naproxen in aqueous systems by UV irradiation: mechanism and toxicity of photolysis products].

This paper studies the degradation mechanism, the reaction kinetics and the toxicity of photolysis products of naproxen in waters under UV irradiation (120 W mercury lamp) by quenching experiments of reactive oxygen species (ROS), oxygen concentration experiment and toxicity evaluation using Vibrio fischeri bacteria. The results demonstrated that NPX could be degraded effectively by UV irradiation and the photolysis pathways was the sum of the degradation by direct photolysis and self-sensitization via ROS, and the contribution rates of self-sensitized photodegradation were 0.1%, 80.

[Biomarkers of endothelial dysfunction and risk of early organ damage: a comparison between patients with primary aldosteronism and essential hypertension].

Objective: To compare plasma concentrations of biomarkers of endothelial dysfunction between patients with primary aldosteronism (PA) and essential hypertension (EH), and to determine whether elevated levels of these biomarkers could predict development of early organ damage.

Methods: Thirty-six PA patients and 39 EH patients matched for age, sex, blood pressure and duration of hypertension were included in this study. Plasma levels of biomarkers reflecting endothelial dysfunction (von Willebrand factor, vWF; soluble intercellular adhesion molecule 1, sICAM-1; and oxidized low density lipoprotein, ox-LDL) were detected and compared between PA and EH patients.