University of Extremadura

About: University of Extremadura is a education organization based out in Badajoz, Spain. It is known for research contribution in the topics: Population & Hyperspectral imaging. The organization has 7856 authors who have published 18299 publications receiving 396126 citations. The organization is also known as: Universidad de Extremadura.

Degradation of ozone-refractory organic phosphates in wastewater by ozone and ozone/hydrogen peroxide (peroxone): the role of ozone consumption by dissolved organic matter.

Abstract: Ozonation is very effective in eliminating micropollutants that react fast with ozone (k > 103 M−1 s−1), but there are also ozone-refractory (k < 10 M−1 s−1) micropollutants such as X-ray contrast media, organic phosphates, and others Yet, they are degraded upon ozonation to some extent, and this is due to •OH radicals generated in the reaction of ozone with organic matter in wastewater (DOM, determined as DOC) The elimination of tri-n-butyl phosphate (TnBP) and tris-2-chloroisopropyl phosphate (TCPP), added to wastewater in trace amounts, was studied as a function of the ozone dose and found to follow first-order kinetics TnBP and TCPP concentrations are halved at ozone to DOC ratios of ∼025 and ∼10, respectively The •OH rate constant of TCPP was estimated at (7 ± 2) × 108 M−1 s−1 by pulse radiolysis Addition of 1 mg H2O2/L for increasing the •OH yield had very little effect This is due to the low rate of reaction of H2O2 with ozone at wastewater conditions (pH 8) that competes unfavorably with t

The Object Agreement Constraint

Abstract: This paper deals with the so-called Person Case Constraint (Bonet, E. 1991), a universal constraint blocking accusative clitics and object agreement morphemes other than third person when a dative is inserted in the same clitic/agreement cluster. The aim of this paper is twofold. First, we argue that the scope of the PCC is considerably broader than assumed in previous work, and that neither its formulation in terms of person (1st/2nd vs. 3rd)-case (accusative vs. dative) restrictions nor its morphological nature are part of the right descriptive generalization. We present evidence (i) that the PCC is triggered by the presence of an animacy feature in the object’s agreement set; (ii) that it is not case dependent, also showing up in languages that lack dative case; and (iii) that it is not morphologically bound. Second, we argue that the PCC, even if it is modified accordingly, still puts together two different properties of the agreement system that should be set apart: (i) a cross-linguistic sensitivity of object agreement to animacy and (ii) a similarly widespread restriction on multiple object agreement observed crosslinguistically. These properties lead us to propose a new generalization, the Object Agreement Constraint (OAC): if the verbal complex encodes object agreement, no other argument can be licensed through verbal agreement.

The SJR indicator: A new indicator of journals' scientific prestige

Abstract: This work was financed by the Junta de Extremadura - Consejeria de Educacion Ciencia & Tecnologia and the Fondo Social Europeo as part of research project PRI06A200, and by the Plan Nacional de Investigacion Cientifica, Desarrollo e Innovacion Tecnologica 2008-2011 and the Fondo Europeo de Desarrollo Regional (FEDER) as part of research projects TIN2008-06514-C02-01 and TIN2008-06514-C02-02.

Contribution of culture media to oxidative stress and its effect on human oocytes

Abstract: The adverse effects of reactive oxygen species (ROS) on many aspects of reproduction are well documented. However, much less is known regarding the contribution of culture media to the oxidative stress of gametes during assisted reproductive techniques. This study measured the generation of ROS by culture media during IVF procedures and its effects on human oocytes. Commercially supplied culture media generated ROS at various rates, depending on the composition, whereas follicular fluid generated ROS at a much lower level. The incubation of cumulus-oocyte complexes (COC) in culture media induced marked lipid peroxidation compared with levels found in freshly retrieved COC. This plasma membrane damage, measured with the quenching of cis-parinaric acid fluorescence assay, was attenuated by supplementation of the medium with alpha-tocopherol or catalase. Moreover, there was an association between ROS production by culture medium and thiolic content consumption within the oocytes, suggesting that the intracellular reduced glutathione pool was partially depleted during in-vitro manipulation. The results show that culture medium could damage oocytes (and consequently embryo development) depending on their composition, and it is proposed that current IVF protocols could be revised in order to decrease ROS generation.