Herpetofauna en dos sitios en el municipio de Soto la Marina, Tamaulipas, México

We conducted a herpetofaunal study from November 2009 to July 2010 on the ranches El Herradero and San Jose de los Leones, both in the municipality of Soto la Marina, in the centraleastern part of the state of Tamaulipas, northeastern Mexico. Their location corresponds to a peninsula surrounded by the Laguna Madre. The objectives were to conduct a herpetological inventory and to determine the distribution of the species in the plant communities and the status of each species following the criteria of the NOM-059-SEMARNAT-2010. The information will be useful in delineating an area to set aside for conservation easement for the species. We followed the transect method described by Campbell & Christman (1982). We recorded 17 species: one anuran, one crocodile, six turtles, three lizards and six snakes. Of these, eight are new records for the municipality of Soto la Marina, 10 species are at risk, six are of special concern, three are threatened, and one is endangered. The ranches contain 34.69% of the herpetofauna species present in the municipality.Se realizó un estudio herpetofaunístico en los ranchos El Herradero y San José de los Leones ambos ubicados en el municipio de Soto la Marina, en la porción central-oriental del estado de Tamaulipas al Noreste de México. Estos predios se ubican en una forma de península rodeada por agua perteneciente a la Laguna Madre. Los objetivos fueron: realizar un inventario herpetológico, determinar la asociación de la herpetofauna con las comunidades vegetales y determinar el estatus de cada una de las especies de acuerdo a la NOM-059-SEMARNAT-2010. Lo anterior con la finalidad de que el área ocupada por los ranchos sea para establecer sitios de conservación como servidumbre ecológica de especies. Se siguió el muestreo de transectos descrito por Campbell & Christman (1982). El estudio se realizó desde noviembre de 2009 hasta julio de 2010. Se registraron 17 especies: un anuro, seis tortugas, un cocodrilo, tres lagartijas y seis serpientes. De estos, ocho son nuevos reportes para el municipio de Soto la Marina, y de acuerdo con la NOM-059-SEMARNAT-2010 se reportaron 10 especies donde seis se encuentran Sujetas a Protección Especial, tres se encuentran Amenazadas y una en Peligro de Extinción. Los ranchos cuentan con 34.69% de las especies de herpetofauna presente en el municipio

Ionized calcium in the atmospheres of two ultra-hot exoplanets WASP-33b and KELT-9b

Ultra-hot Jupiters are emerging as a new class of exoplanets. Studying their chemical compositions and temperature structures will improve our understanding of their mass loss rate as well as their formation and evolution. We present the detection of ionized calcium in the two hottest giant exoplanets - KELT-9b and WASP-33b. By using transit datasets from CARMENES and HARPS-N observations, we achieved high-confidence-level detections of Ca II using the cross-correlation method. We further obtain the transmission spectra around the individual lines of the Ca II H&K doublet and the near-infrared triplet, and measure their line profiles. The Ca II H&K lines have an average line depth of 2.02 +/- 0.17% (effective radius of 1.56 R_p) for WASP-33b and an average line depth of 0.78 +/- 0.04% (effective radius of 1.47 R_p) for KELT-9b, which indicates that the absorptions are from very high upper-atmosphere layers close to the planetary Roche lobes. The observed Ca II lines are significantly deeper than the predicted values from the hydrostatic models. Such a discrepancy is probably a result of hydrodynamic outflow that transports a significant amount of Ca II into the upper atmosphere. The prominent Ca II detection with the lack of significant Ca I detection implies that calcium is mostly ionized in the upper atmospheres of the two planets

The CARMENES search for exoplanets around M dwarfs A super-Earth planet orbiting HD 79211 (GJ 338 B)

Aims. We report on radial velocity time series for two M0.0 V stars, GJ 338 B and GJ 338 A, using the CARMENES spectrograph, complemented by ground-telescope photometry from Las Cumbres and Sierra Nevada observatories. We aim to explore the presence of small planets in tight orbits using the spectroscopic radial velocity technique. Methods. We obtained 159 and 70 radial velocity measurements of GJ 338 B and A, respectively, with the CARMENES visible channel between 2016 January and 2018 October. We also compiled additional relative radial velocity measurements from the literature and a collection of astrometric data that cover 200 a of observations to solve for the binary orbit. Results. We found dynamical masses of 0.64 ± 0.07 Mͼ for GJ 338 B and 0.69 ± 0.07 Mͼ for GJ 338 A. The CARMENES radial velocity periodograms show significant peaks at 16.61 ± 0.04 d (GJ 338 B) and 16.3^(+3.5)_(−1.3) d (GJ 338 A), which have counterparts at the same frequencies in CARMENES activity indicators and photometric light curves. We attribute these to stellar rotation. GJ 338 B shows two additional, significant signals at 8.27 ± 0.01 and 24.45 ± 0.02 d, with no obvious counterparts in the stellar activity indices. The former is likely the first harmonic of the star’s rotation, while we ascribe the latter to the existence of a super-Earth planet with a minimum mass of 10.27^(+1.47)_(−1.38) Mͼ orbiting GJ 338 B. We have not detected signals of likely planetary origin around GJ 338 A. Conclusions. GJ 338 Bb lies inside the inner boundary of the habitable zone around its parent star. It is one of the least massive planets ever found around any member of stellar binaries. The masses, spectral types, brightnesses, and even the rotational periods are very similar for both stars, which are likely coeval and formed from the same molecular cloud, yet they differ in the architecture of their planetary systems

Estilos de liderança, ambiente organizacional e riscos psicossociais nas entidades do sector da saúde: um estudo comparativo

Neste estudo se descreve o clima organizacional, os fatores de risco psicossocial e os estilos de liderança que percebe um grupo de 400 trabalhadores da área da saúde em quatro cidades da Colômbia, e procuram-se diferenças significativas nessas cidades. Aplicaram-se o ECO o PIC e o PAT. Segundo os resultados, os participantes apresentaram riscos psicossociais de vários tipos, dos quais os mais importantes foram os referidos às relações interpessoais. O ambiente organizacional, embora não ideal, não é negativo. Os dois estilos de liderança achados no estudo estiveram apenas presentes em Bogotá. Acharam-se diferenças significativas na maioria das variáveis estudadas, quiçá devido ao impacto de aspectos culturais. Nós discutimos estes resultados.The purpose of this study was to describe the organizational climate, psychosocial risk factors and leadership styles perceived by a group of 400 workers of the health sector in four Colombian cities and to observe whether there are significant differences between them. In order to achieve this objective, the instruments entitled ECO, CFP and PAT_were administered. According to the results, the participants showed psychosocial risks factors of diverse nature and the most relevant ones were those related to interpersonal relationships. Although the organizational climate found was not optimal, it was not adverse either. The two resulting leadership styles were evidenced only in Bogota. Significant differences were found in most variables studied which could be attributed to cultural aspects. These findings are discussed.El propósito de este estudio fue describir el clima organizacional; los factores de riesgo psicosocial y los estilos de liderazgo que perciben un grupo de 400 trabajadores del sector salud en cuatro ciudades colombianas; y observar si existen diferencias significativas entre ellas. Para ello se aplicó el ECO; el CFP y el PAT. De acuerdo con los resultados; los participantes presentaron riesgos psicosociales de diversa índole; siendo más relevantes los referidos a las relaciones interpersonales El clima organizacional; aunque no es óptimo; tampoco es adverso. Los dos estilos de liderazgo resultantes en el estudio fueron evidenciados solamente en Bogotá. Se encontraron diferencias significativas en la mayoría de las variables estudiadas; lo cual podría deberse al efecto de aspectos culturales. Se discuten estos hallazgos

Epigenetic reprogramming in the porcine germ line

<p>Abstract</p> <p>Background</p> <p>Epigenetic reprogramming is critical for genome regulation during germ line development. Genome-wide demethylation in mouse primordial germ cells (PGC) is a unique reprogramming event essential for erasing epigenetic memory and preventing the transmission of epimutations to the next generation. In addition to DNA demethylation, PGC are subject to a major reprogramming of histone marks, and many of these changes are concurrent with a cell cycle arrest in the G2 phase. There is limited information on how well conserved these events are in mammals. Here we report on the dynamic reprogramming of DNA methylation at CpGs of imprinted loci and DNA repeats, and the global changes in H3K27me3 and H3K9me2 in the developing germ line of the domestic pig.</p> <p>Results</p> <p>Our results show loss of DNA methylation in PGC colonizing the genital ridges. Analysis of <it>IGF2-H19 </it>regulatory region showed a gradual demethylation between E22-E42. In contrast, DMR2 of <it>IGF2R </it>was already demethylated in male PGC by E22. In females, <it>IGF2R </it>demethylation was delayed until E29-31, and was de novo methylated by E42. DNA repeats were gradually demethylated from E25 to E29-31, and became de novo methylated by E42. Analysis of histone marks showed strong H3K27me3 staining in migratory PGC between E15 and E21. In contrast, H3K9me2 signal was low in PGC by E15 and completely erased by E21. Cell cycle analysis of gonadal PGC (E22-31) showed a typical pattern of cycling cells, however, migrating PGC (E17) showed an increased proportion of cells in G2.</p> <p>Conclusions</p> <p>Our study demonstrates that epigenetic reprogramming occurs in pig migratory and gonadal PGC, and establishes the window of time for the occurrence of these events. Reprogramming of histone H3K9me2 and H3K27me3 detected between E15-E21 precedes the dynamic DNA demethylation at imprinted loci and DNA repeats between E22-E42. Our findings demonstrate that major epigenetic reprogramming in the pig germ line follows the overall dynamics shown in mice, suggesting that epigenetic reprogramming of germ cells is conserved in mammals. A better understanding of the sequential reprogramming of PGC in the pig will facilitate the derivation of embryonic germ cells in this species.</p

Distribución ecológica de la herpetofauna en gradientes altitudinales superiores del Cerro El Potosí, Galeana, Nuevo León, México

This herpetofaunistic study was conducted in Cerro El Potosi in the municipality of Galeana, Mexico, between November 2006 and November 2007. This is the first extensive formal work done in the area, thus increasing the knowledge of the herpetofauna of the Sierra Madre Oriental and in particular of this mountain, a State Protected Natural Area, and providing information that will enhancemanagement and conservation strategies for this vertebrate group. Cerro El Potosí has an altitude gradient between 2000 and 3750 m, where distinct plant communities are found. The objectives of this re-search were to identify species that occur in the altitudinal gradient, as well as their substrate preferences and distribution in different plant communities. Sampling was performed using transects, following the sampling and inventory method of Campbell and Christman (1982). A total of 188 individuals of seven species were collected, one species of frog, one species of salamander, four species of lizards and one species of snake.Este estudio herpetofaunístico se realizó en el Cerro El Potosí en el municipio de Galeana, Nuevo León, México, entre noviembre de 2006 y noviembre de 2007. Este es el primer trabajo formalextensivo que se realiza en esta área, lo que permite incrementar el conocimiento de la herpetofauna de la Sierra Madre Oriental y en particular de esta montaña, un Área Natural Protegida a nivel estatal, y aportar información que permita establecer mejores estrategias de manejo y conservación de este grupo de vertebrados. El Cerro El Potosí cuenta con un gradiente altitudinal que va desde los 2000 hasta los 3750 msnm, donde se presentan distintas comunidades vegetales. Los objetivos del trabajo fueron: determinarlas especies que ocurren en el gradiente altitudinal, determinar sus preferencias de sustrato, y su distribución en diferentes comunidades vegetales. Los muestreos se realizaron mediante transectos, siguiendo el método de inventario y muestreo de Campbell y Christman (1982). Se capturaron 188 individuos de siete especies, una especie de anuro, una especie de urodelo, cuatro especies de saurios y una especie de serpiente

Fabrication of 2D based pn junctions with improved performance by selective laser annealing

There is a growing body of research on transistors based on nanomaterials such as 2D transition metal dichalcogenides (TMDs) (WS2, MoS2, etc.) and carbon nanotubes (CNTs). Here we co-deposited MoS2 and WS2 as PN junctions. The deposition could be performed on a PCB (printed circuit board) with Cu electrodes. The current-voltage characteristics were obtained using an Arduino board. The effect of laser irradiation could be investigated by studying the IV curves and light sensitivity for the same kind of devices in which one of the Cu electrodes was modified by a laser. The IV curves from the devices with and without laser treatment could be compared to quantify the changes in performance