Influencia de las fases lunares en fertilidad, tasa de preñez y partos de vacas mestizas en el trópico seco.

CANUTO MUÑOZ GARCIA ROSENDO CUICAS HUERTA JUAN GONZALEZ MALDONADO EFREN ESTRADA PAQUI ISIDRO JAUREGUI PLATA JULIO CESAR GOMEZ VARGAS (2023, [Artículo])

There is speculation about moon phases influencing animal reproductive performance. A study was carried out to shed light on the influence of moon phases on estrus presentation, pregnancy rate, calving presentation, and offspring sex in cows from the Mexican dry tropical region. The reproductive data of 580 crossbred cows from 2010 to 2021 was organized according to reproductive events (estrus presentation, gestation, calving presentation, and offspring sex) occurrence during moon phases (new moon, first quarter, full moon, and last quarter). The data were analyzed by Chi-squared test and logistic regression. The full moon reduced the estrus presentation (p0.05). It is concluded that the full moon reduces estrus presentation in crossbred cows. Moon phases do not influence the gestation, calving presentation, and offspring sex.

estrus calving offspring sex CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS CIENCIAS VETERINARIAS FISIOLOGÍA ANIMAL

An anion conductance, the essential component of the hydroxyl-radical-induced Ion current in plant roots

IGOR POTTOSIN ALBERTO ISAAC ZEPEDA JAZO JAYACUMAR BOSE (2018, [Artículo])

Oxidative stress signaling is essential for plant adaptation to hostile environments. Previous studies revealed the essentiality of hydroxyl radicals (HO•)-induced activation of massive K+ efflux and a smaller Ca2+ influx as an important component of plant adaptation to a broad range of abiotic stresses. Such activation would modify membrane potential making it more negative. Contrary to these expectations, here, we provide experimental evidence that HO• induces a strong depolarization, from −130 to −70 mV, which could only be explained by a substantial HO•-induced efflux of intracellular anions. Application of Gd3+ and NPPB, non-specific blockers of cation and anion conductance, respectively, reduced HO• induced ion fluxes instantaneously, implying a direct block of the dual conductance. The selectivity of an early instantaneous HO•-induced whole cell current fluctuated from more anionic to more cationic and vice versa, developing a higher cation selectivity at later times. The parallel electroneutral efflux of K+ and anions should underlie a substantial leak of the cellular electrolyte, which may affect the cell’s turgor and metabolic status. The physiological implications of these findings are discussed in the context of cell fate determination, and ROS and cytosolic K+ signaling

BIOQUÍMICA Anions Membrane potentials (Electrophysiology) Patch-clamp techniques (Electrophysiology) Oxidative stress Anion conductance Electrolyte leakage Hydroxyl radical

Sen4Rust: sentinel satellites for wheat rust disease forecasting

Gerald Blasch (2023, [Objeto de congreso])

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA MONITORING SATELLITE OBSERVATION RUSTS FORECASTING

Effects of geostrophic kinetic energy on the distribution of mesopelagic fish larvae in the southern Gulf of California in summer/fall stratified seasons

FERNANDO CONTRERAS CATALA (2016, [Artículo])

Effects of geostrophic kinetic energy flux on the three-dimensional distribution of fish larvae of mesopelagic species (Vinciguerria lucetia, Diogenichthys laternatus, Benthosema panamense and Triphoturus mexicanus) in the southern Gulf of California during summer and fall seasons of stronger stratification were analyzed. The greatest larval abundance was found at sampling stations in geostrophic kinetic energy-poor areas (<7.5 J/m3), where the distribution of the dominant species tended to be stratified. Larvae of V. lucetia (average abundance of 318 larvae/10m2) and B. panamense (174 larvae/10m2) were mostly located in and above the pycnocline (typically ∼ 40 m depth). In contrast, larvae of D. laternatus (60 larvae/10m2) were mainly located in and below the pycnocline. On the other hand, in sampling stations from geostrophic kinetic energy-rich areas (> 21 J/m3), where mesoscale eddies were present, the larvae of the dominant species had low abundance and were spread more evenly through the water column, in spite of the water column stratification. For example, in a cyclonic eddy, V. lucetia larvae (34 larvae/10m2) extended their distribution to, at least, the limit of sampling 200 m depth below the pycnocline, while D. laternatus larvae (29 larvae/10m2) were found right up to the surface, both probably as a consequence mixing and secondary circulation in the eddy. Results showed that the level of the geostrophic kinetic energy flux affects the abundance and the three-dimensional distribution of mesopelagic fish larvae during the seasons of stronger stratification, indicating that areas with low geostrophic kinetic energy may be advantageous for feeding and development of mesopelagic fish larvae because of greater water column stability. © 2016 Contreras-Catala et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Article, autumn, Benthosema panamense, Diogenichthys laternatus, environmental factor, environmental parameters, fish, geographic distribution, geostrophic kinetic energy, hydrography, larva, nonhuman, population abundance, population dispersion, pop CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO OCEANOGRAFÍA OCEANOGRAFÍA

Fundamentos de radares meteorológicos: aspectos clásicos (primera de dos partes)

MOISES MICHEL ROSENGAUS MOSHINSKY (1995, [Artículo])

México se encuentra, en cuanto a la observación hidrometeorológica se refiere, en el umbral de una nueva época que se sustenta, esencialmente, en una red moderna de radares meteorológicos. Esta primera parte se restringe a los aspectos clásicos que todavía son parte de los instrumentos modernos. Se presentan conceptos fundamentales, dirigidos a los ingenieros hidráulicos e hidrólogos, que permiten una mejor comprensión del funcionamiento de los equipos, así como una serie de limitaciones y restricciones esenciales para interpretar correctamente sus resultados.

Radares meteorológicos Operación Meteorología CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA

La estructura de la conciencia histórica en clave hemenéutico-ontológica

MIGUEL ANGEL GUZMAN LOPEZ (2019, [Libro])

La estructura de la conciencia histórica en clave hermenéutico-ontológica cuestiona el sentido de la existencia estrechamente ligado a la pregunta por lo propio del ser de cada individuo y de cada pue- blo. Ambas cuestiones relacionadas con lo que hoy se entiende como conciencia histórica. Se trata de un tema de innegable actualidad, apoyado en la formación del autor como historiador y filósofo, con un estilo claro y directo que ofrece una ayuda adicional a todo lector interesado en comprender la estructura de la conciencia histórica.

HUMANIDADES Y CIENCIAS DE LA CONDUCTA Conciencia histórica Hermenéutica Ontología

Satellite Earth Observation (EO) for agriculture

Gerald Blasch (2023, [Objeto de congreso])

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA MONITORING AGRICULTURE SATELLITE OBSERVATION EARTH OBSERVATION SATELLITES

Inferring cetacean population densities from the absolute dynamic topography of the ocean in a hierarchical bayesian framework

MARIO ANDRES PARDO RUEDA (2015, [Artículo])

We inferred the population densities of blue whales (Balaenoptera musculus) and short-beaked common dolphins (Delphinus delphis) in the Northeast Pacific Ocean as functions of the water-column's physical structure by implementing hierarchical models in a Bayesian framework. This approach allowed us to propagate the uncertainty of the field observations into the inference of species-habitat relationships and to generate spatially explicit population density predictions with reduced effects of sampling heterogeneity. Our hypothesis was that the large-scale spatial distributions of these two cetacean species respond primarily to ecological processes resulting from shoaling and outcropping of the pycnocline in regions of wind-forced upwelling and eddy-like circulation. Physically, these processes affect the thermodynamic balance of the water column, decreasing its volume and thus the height of the absolute dynamic topography (ADT). Biologically, they lead to elevated primary productivity and persistent aggregation of low-trophic-level prey. Unlike other remotely sensed variables, ADT provides information about the structure of the entire water column and it is also routinely measured at high spatial-temporal resolution by satellite altimeters with uniform global coverage. Our models provide spatially explicit population density predictions for both species, even in areas where the pycnocline shoals but does not outcrop (e. g. the Costa Rica Dome and the North Equatorial Countercurrent thermocline ridge). Interannual variations in distribution during El Niño anomalies suggest that the population density of both species decreases dramatically in the Equatorial Cold Tongue and the Costa Rica Dome, and that their distributions retract to particular areas that remain productive, such as the more oceanic waters in the central California Current System, the northern Gulf of California, the North Equatorial Countercurrent thermocline ridge, and the more southern portion of the Humboldt Current System. We posit that such reductions in available foraging habitats during climatic disturbances could incur high energetic costs on these populations, ultimately affecting individual fitness and survival. © 2015, public library of science. All rights reserved.

CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO OCEANOGRAFÍA OCEANOGRAFÍA

Optimización de los diámetros de las tuberías de una red de distribución de agua mediante algoritmos de recocido simulado

HECTOR SANVICENTE SANCHEZ JUAN FRAUSTO SOLIS (2003, [Artículo])

La determinación de los diámetros de las tuberías en el diseño de menor costo de una red de distribución de agua es un problema con restricciones, fuertemente no lineal, con múltiples óptimos locales, cuyo espacio de soluciones posee muchas regiones no factibles. El algoritmo heurístico de optimización llamado recocido simulado (RS) es un método global que ha sido usado para hacer búsquedas estocásticas en el espacio de soluciones del problema, mejorando el desempeño de otros métodos. Este trabajo propone una formulación penalizada del problema que permite al algoritmo RS, entre otras ventajas, la posibilidad de que la caminata estocástica que efectúa sea menos sinuosa al cruzar regiones no factibles. Este enfoque mejora la eficiencia del algoritmo RS para un mismo nivel de error en relación con su desempeño para una formulación clásica del problema con restricciones.

Redes de distribución de agua Optimización Métodos estocásticos INGENIERÍA Y TECNOLOGÍA

Fundamentos de radares meteorológicos: aspectos modernos (segunda de dos partes)

MOISES MICHEL ROSENGAUS MOSHINSKY (1995, [Artículo])

En la primera parte se trataron principios de funcionamiento y conceptos esenciales para la correcta interpretación de productos de radar en cuanto a sus características clásicas, aquellas que los radares meteorológicos presentan desde su concepción después de la II Guerra Mundial. En esta segunda parte se hace lo propio para los aspectos modernos de los radares meteorológicos, incluyendo el control y procesamiento digital, la capacidad Doppler y la doble polarización. Se discuten sus productos, la operación rutinaria de un radar meteorológico moderno, su relación con otros sistemas de medición similares, así como sus aplicaciones e impacto en la hidrología.

Radares meteorológicos Operación Meteorología CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA