Modified Debye-Huckel Electron Shielding and Penetration Factor

Screened potential, modified by non standard electron cloud distributions responsible for the shielding effect on fusion of reacting nuclei in astrophysical plasmas, is derived. The case of clouds with depleted tails in space coordinates is discussed. The modified screened potential is obtained both from statistical mechanics arguments based on fluctuations of the inverse of the Debye-Huckel radius and from the solution of a Bernoulli equation used in generalized statistical mechanics. Plots and tables useful in evaluating penetration probability at any energy are provided.Comment: 9 pages, 3 figures, 3 table

Análisis por qPCR de la respuesta a P. cinnamomi en clones de castaño in vitro con diferente nivel de resistencia

Peer reviewe

Estudo da oferta e comercialização de repolho na CEAPE no período de 1999 a 2005.

bitstream/item/26141/1/f-11.pd

Astrocytes and Müller Cell Alterations During Retinal Degeneration in a Transgenic Rat Model of Retinitis Pigmentosa

Purpose: Retinitis pigmentosa includes a group of progressive retinal degenerative diseases that affect the structure and function of photoreceptors. Secondarily to the loss of photoreceptors, there is a reduction in retinal vascularization, which seems to influence the cellular degenerative process. Retinal macroglial cells, astrocytes, and Müller cells provide support for retinal neurons and are fundamental for maintaining normal retinal function. The aim of this study was to investigate the evolution of macroglial changes during retinal degeneration in P23H rats. Methods: Homozygous P23H line-3 rats aged from P18 to 18 months were used to study the evolution of the disease, and SD rats were used as controls. Immunolabeling with antibodies against GFAP, vimentin, and transducin were used to visualize macroglial cells and cone photoreceptors. Results: In P23H rats, increased GFAP labeling in Müller cells was observed as an early indicator of retinal gliosis. At 4 and 12 months of age, the apical processes of Müller cells in P23H rats clustered in firework-like structures, which were associated with ring-like shaped areas of cone degeneration in the outer nuclear layer. These structures were not observed at 16 months of age. The number of astrocytes was higher in P23H rats than in the SD matched controls at 4 and 12 months of age, supporting the idea of astrocyte proliferation. As the disease progressed, astrocytes exhibited a deteriorated morphology and marked hypertrophy. The increase in the complexity of the astrocytic processes correlated with greater connexin 43 expression and higher density of connexin 43 immunoreactive puncta within the ganglion cell layer (GCL) of P23H vs. SD rat retinas. Conclusions: In the P23H rat model of retinitis pigmentosa, the loss of photoreceptors triggers major changes in the number and morphology of glial cells affecting the inner retina

INNOVACIONES TECNOLÓGICAS INCORPORADAS EN LA COMUNIDAD DE REGANTES DE L’ALCÚDIA (VALENCIA)

[ES] Este trabajo pretende transmitir cómo las obras de “MEJORA DEL SISTEMA DE RIEGO EN EL SECTOR II – FASE I Y FASE II, L’ALCÚDIA, DE LA ZONA REGABLE DEL CANAL JÚCAR – TURIA (VALENCIA)” han contribuido a la optimización de los regadíos de la zona incorporando innovaciones tecnológicas fruto del esfuerzo conjunto entre Ministerio de Agricultura, SEIASA, Consellería de Presidencia y Agricultura, Pesca, Alimentación y Agua, la propia Comunidad de Regantes y Tragsa. Estas innovaciones incorporadas en dichas obras se clasifican en las siguientes áreas: - Innovación en hidrante multiusuario. - Sistema de monitorización ambiental multipropósito. - Mejora de la gestión integral hídrica y energética. - Mejora medioambiental. - Mejora de calidad de las aguas y seguridad en abastecimiento hídrico en las Comunidades de Regantes en periodos de sequía.Carbonell Solbes, N.; Pardo Cuenca, C. (2015). INNOVACIONES TECNOLÓGICAS INCORPORADAS EN LA COMUNIDAD DE REGANTES DE L’ALCÚDIA (VALENCIA). En XXXIII CONGRESO NACIONAL DE RIEGOS. Valencia 16-18 junio de 2015. Editorial Universitat Politècnica de València. https://doi.org/10.4995/CNRiegos.2015.1460OC

Geographic mobility and social inequality among Peruvian university students

The purpose of this study was to explore geographic mobility among university students in Peru and to understand how mobility patterns differ by region and by demographic indicators of inequality. The ways that students may be able to move geographically in order to access quality higher education within the educational system can be a driver of equality or inequality, depending on who is able to take advantage. Using data from a university census, we examine how demographic indicators of inequality are related to geographic mobility for university attendance, how prior geographic mobility predicts later mobility for university attendance, and how these relationships differ based on the number and quality of universities in a region. Results show that sociodemographic variables related to social inequality explain a substantial amount of students\u27 postsecondary mobility. However, some of these relationships do not operate in the same way in all of the regions. Depending on the availability of universities and their quality, patterns of association between inequality and geographic mobility change. Implications for higher education policy as well as further research examining geographic mobility and inequality in education are discussed

Microglia activation in a model of retinal degeneration and TUDCA neuroprotective effects

Background: Retinitis pigmentosa is a heterogeneous group of inherited neurodegenerative retinal disorders characterized by a progressive peripheral vision loss and night vision difficulties, subsequently leading to central vision impairment. Chronic microglia activation is associated with various neurodegenerative diseases including retinitis pigmentosa. The objective of this study was to quantify microglia activation in the retina of P23H rats, an animal model of retinitis pigmentosa, and to evaluate the therapeutic effects of TUDCA (tauroursodeoxycholic acid), which has been described as a neuroprotective compound. Methods: For this study, homozygous P23H line 3 and Sprague-Dawley (SD) rats were injected weekly with TUDCA (500 mg/kg, ip) or vehicle (saline) from 20 days to 4 months old. Vertical retinal sections and whole-mount retinas were immunostained for specific markers of microglial cells (anti-CD11b, anti-Iba1 and anti-MHC-II). Microglial cell morphology was analyzed and the number of retinal microglial was quantified. Results: Microglial cells in the SD rat retinas were arranged in regular mosaics homogenously distributed within the plexiform and ganglion cell layers. In the P23H rat retina, microglial cells increased in number in all layers compared with control SD rat retinas, preserving the regular mosaic distribution. In addition, a large number of amoeboid CD11b-positive cells were observed in the P23H rat retina, even in the subretinal space. Retinas of TUDCA-treated P23H animals exhibited lower microglial cell number in all layers and absence of microglial cells in the subretinal space. Conclusions: These results report novel TUDCA anti-inflammatory actions, with potential therapeutic implications for neurodegenerative diseases, including retinitis pigmentosa.This research was supported by grants from the Spanish Ministry of Economy and Competitiveness-FEDER (BFU2012-36845), Instituto de Salud Carlos III (RETICS RD12/0034/0010), Organización Nacional de Ciegos Españoles (ONCE), FUNDALUCE, Asociación Retina Asturias and Fundación Jesús de Gangoiti

Does low-dose aspirin initiated before 11 weeks' gestation reduce the rate of preeclampsia?

OBJECTIVE: DATA: Pre-conception or early administration of low-dose aspirin might improve endometrial growth, placental vascularization and organogenesis. Most studies have evaluated the potential benefit of pre-conception or early administration of low-dose aspirin in women with a history of recurrent pregnancy loss, women who have undergone in vitro fertilization or women with thrombophilia or antiphospholipid syndrome. These women are at an increased risk of placenta-associated complications of pregnancy, including preeclampsia, preterm delivery and fetal growth restriction. STUDY: We performed a systematic review and meta-analysis to evaluate the effect of low-dose aspirin initiated at <11 weeks' gestation on the risk of preeclampsia, gestational hypertension, or any hypertensive disorder of pregnancy. Secondary outcomes included preterm delivery at <37 weeks' gestation and fetal growth restriction. STUDY APPRAISAL AND SYNTHESIS METHODS: We searched in MEDLINE via PubMed, EMBASE, Cochrane Central Register of Controlled Trials (CENTRAL), ClinicalTrials.Gov and the World Health Organization International Clinical Trials Registry Platform (WHO-ICTRP) from 1985 to November 2018. Entry criteria were randomized controlled trials evaluating the effect of aspirin administered at 85% of the study population. Relative risks (RR) with 95% confidence intervals (CI) were calculated for each study and pooled for global analysis as the effect measure. We assessed statistical heterogeneity in each meta-analysis using the Chi2 statistics, I2 and Tau2. Heterogeneity was considered substantial if an I2 was greater than 50% and either the Tau2 was greater than zero, or there was a low P-value (<0.10) in the Chi2 test for heterogeneity. Random-effects meta-analysis, weighted by the size of the studies, was performed to produce an overall summary on aspirin effect for each outcome. Sensitivity analysis by sequential omission of each individual study and by fixed-effects model was performed. Publication bias was not assessed due to the small number of included studies. Statistical analysis was performed using Stata release 14.0 (StataCorp, College Station, TX). RESULTS: The entry criteria were fulfilled by eight randomized controlled trials on a combined total of 1,426 participants. Low-dose aspirin initiated at <11 weeks' gestation was associated with a non-significant reduction in the risk of preeclampsia (RR 0.52; 95% CI: 0.23-1.17, P=0.115), gestational hypertension (RR 0.49; 95% CI: 0.20-1.21; P=0.121) and any hypertensive disorder of pregnancy (RR 0.59; 95% CI 0.33-1.04, P=0.067). Early low-dose aspirin reduced the risk of preterm delivery (RR 0.52; 95% CI: 0.27-0.97, p=0.040) but had no impact on the risk of fetal growth restriction (RR 1.10; 95% CI 0.58-2.07, P=0.775). Except for preterm delivery and any hypertensive disorder of pregnancy, sensitivity analysis demonstrated similar observations; therefore confirming the robustness of the analysis. CONCLUSION: The administration of low-dose aspirin at <11 weeks' gestation in high risk women does not decrease the risk of preeclampsia, gestational hypertension, any hypertensive disorder of pregnancy and fetal growth restriction. However, it might reduce the risk of preterm delivery. Larger randomized controlled trials will be required to substantiate the findings.pre-print408 K

Electric field effects on magnetotransport properties of multiferroic Py/YMnO3/Pt heterostructures

We report on the exchange bias between antiferromagnetic and ferroelectric hexagonal YMnO3 epitaxial thin films sandwiched between a metallic electrode (Pt) and a soft ferromagnetic layer (Py). Anisotropic magnetoresistance measurements are performed to monitor the presence of an exchange bias field. When the heteroestructure is biased by an electric field, it turns out that the exchange bias field is suppressed. We discuss the dependence of the observed effect on the amplitude and polarity of the electric field. Particular attention is devoted to the role of current leakage across the ferroelectric layer.Comment: Accepted for publication in Philosophical Magazine Letters (Special issue on multiferroics