Diffeomorphisms, Noether Charges and Canonical Formalism in 2D Dilaton Gravity

We carry out a parallel study of the covariant phase space and the conservation laws of local symmetries in two-dimensional dilaton gravity. Our analysis is based on the fact that the Lagrangian can be brought to a form that vanishes on-shell giving rise to a well-defined covariant potential for the symplectic current. We explicitly compute the symplectic structure and its potential and show that the requirement to be finite and independent of the Cauchy surface restricts the asymptotic symmetries.Comment: 14 pages, latex with psfig macro, one figur

Murine typhus in Mexico City: report of an imported case

Murine typhus is endemic in several countries. We herein report an imported case of murine typhus caused by Rickettsia typhi in Mexico City. This is the first report of a case after almost 20 years since the last report. The species was confirmed by DNA sequencing and phylogenetic reconstruction

Obtención de κ-Carragenano y λ-Carragenano a partir de macroalga Chondracanthus chamissoi y su aplicación en la industria alimentaria

The exploitation of algae producing carrageenan are intensified since the 80 '. Obtaining κ-carrageenan and λ-carrageenan is a function of the proper selection of algae, correct identification of the stages of life, control of parameters such as temperature, pH, time, concentration of solutions. The extraction process is based on: soluble in hot water and insolubility in polar organic solvents. Gametophyte phase is a starting point for the production of κ-carrageenan and phase sporophitic is geared to the production of λ - carrageenan. The ability gelling (κ-carrageenan) and performance viscosante (λ-carrageenan) of carrageenan are characteristics that apply to gelificar or thicken aqueous systems.La explotación de algas productoras de carragenanos se intensifican a partir de los 80. La obtención de κ -carragenano y λ -carragenano está en función de la selección adecuada de algas, identificación correcta de las fases de vida, control de parámetros como temperatura, pH, tiempo y concentración de soluciones. El proceso de extracción se basa en: solubilidad en agua caliente e insolubilidad en solventes orgánicos polares. La fase gametofita es punto de partida para la producción de κ-carragenano y la fase esporofita se orienta a la producción de λ-carragenano. La capacidad gelificante (κ-carragenano) y el comportamiento viscosante (λ-carragenano) de los carragenanos son características que se aplican para gelificar o espesar sistemas acuoso

Monitorización con vídeo-EEG y ECG simultáneo para el diagnóstico diferencial de trastornos de conciencia transitorios. A propósito de un caso

We present the case of a 36 year-old woman, with history of transient consciousness disorders with vegetative state, interpreted as epileptic crises and treated with valproate for two years. After nine asymptomatic years, they reappeared associated with migraine, vomiting and some generalized convulsions. Electroencephalogram and cerebral magnetic resonance turned out normal, and treatment with zonisamide was started, without beneficial results. Later cardiological studies objectified a blockage of the left branch that coincided with dizziness. The study was completed with Video-EGG monitoring, where there was an episode that showed temporary right epileptiform activity, with a diagnosis established of focal epilepsy of unknown cause. At present, she remains asymptomatic with oxycarbazepine

In Vivo and in vitro antitumor activity of tomatine in hepatocellular carcinoma

Background: There is abundant ethnopharmacological evidence the uses of regarding Solanum species as antitumor and anticancer agents. Glycoalkaloids are among the molecules with antiproliferative activity reported in these species. Purpose: To evaluate the anticancer effect of the Solanum glycoalkaloid tomatine in hepatocellular carcinoma (HCC) in vitro (HepG2 cells) and in vivo models. Methods: The resazurin reduction assay was performed to detect the effect of tomatine on cell viability in human HepG2 cell lines. Programmed cell death was investigated by means of cellular apoptosis assays using Annexin V. The expression of cancer related proteins was detected by Western blotting (WB). Reactive oxygen species (ROS) and calcium were determined by 2,7-dichlorodihydrofluorescein diacetate and Fluo-4, respectively. Intrahepatic HepG2 xenograft mouse model was used to elucidate the effect of tomatine on tumor growth in vivo. Results and Discussion: Tomatine reduced HepG2 cell viability and induced the early apoptosis phase of cell death, consistently with caspase-3, -7, Bcl-2 family, and P53 proteins activation. Furthermore, tomatine increased intracellular ROS and cytosolic Ca+2 levels. Moreover, the NSG mouse xenograft model showed that treating mice with tomatine inhibited HepG2 tumor growth. Conclusion: Tomatine inhibits in vitro and in vivo HCC tumorigenesis in part via modulation of p53, Ca+2, and ROS signalling. Thus, the results suggest the potential cancer therapeutic use of tomatine in HCC patients

Targeted glutamate supply boosts insulin concentrations, ovarian activity, and ovulation rate in yearling goats during the anestrous season

The neuroendocrine regulation of the seasonal reproductive axis requires the integration of internal and external signals to ensure synchronized physiological and behavioral responses. Seasonal reproductive changes contribute to intermittent production, which poses challenges for optimizing goat product yields. Consequently, a significant objective in seasonal reproduction research is to attain continuous reproduction and enhance profitability in goat farming. Glutamate plays a crucial role as a modulator in several reproductive and metabolic processes. Hence, the aim of this study was to evaluate the potential impact of exogenous glutamate administration on serum insulin concentration and ovarian function during the out-of-season period in yearling goats. During the anestrous season, animals were randomly located in individual pens to form two experimental groups: (1) glutamate (n = 10, live weight (LW) = 29.1 ± 1.02 kg, body condition score (BCS) = 3.4 ± 0.2 units) and (2) control (n = 10; LW = 29.2 ± 1.07 kg, BCS = 3.5 ± 0.2), with no differences (p < 0.05) regarding LW and BCS. Then, goats were estrus-synchronized, and blood sampling was carried out for insulin quantification. Ovaries were ultrasonographically scanned to assess ovulation rate (OR), number of antral follicles (AFs), and total ovarian activity (TOA = OR + AF). The research outcomes support our working hypothesis. Certainly, our study confirms that those yearling goats treated with exogenous glutamate displayed the largest (p < 0.05) insulin concentrations across time as well as an augmented (p < 0.05) out-of-season ovarian activity

Uso de módulos en traspatio para cultivo de hortalizas con mayor demanda en la zona de Tuxpan, Veracruz

En el mundo se han desarrollado en el sector agropecuario tecnologías innovadoras que como principal meta aumentar la calidad de los productos y aumentar el volumen, actualmente uno de los objetivos más importantes, es el cuidado del medio ambiente y el consumo de alimentos sanos. La principal innovación de este proyecto son los cultivos hidropónicos en módulos para poder cultivar hortalizas en espacios pequeños de las casas (traspatio). Estos cultivos tienen la ventaja de producir cosechas en un menor tiempo. Por lo anterior, se planeó implementar el uso de módulos en traspatio para cultivo de hortalizas con mayor demanda en la zona de Tuxpan, Veracruz. Se realizaron encuestas tomando en cuenta sólo a la población económicamente activa de un rango de edades de 18 a más de 40 años, obteniendo un tamaño de muestra de 382 personas a encuestar, el objetivo de las encuestas fue principalmente determinar el tipo de hortalizas que tienen mayor demanda y el tipo de módulos que los ciudadanos estarían dispuestos a adquirir para producir sus hortalizas para propio consumo y/o comercialización. Los resultados que se obtuvieron mostraron: que de las 382 personas encuestadas, se confirmó el consumo de hortalizas por 1135 personas más; los sitios preferidos para adquirir las hortalizas son las tiendas pequeñas locales y el mercado; las hortalizas que tienen mayor demanda son tomate, tomate verde, chile, cebolla, cilantro, calabacita, acelgas, espinacas, lechuga, papa ajo, rábanos, zanahoria, brócoli, frijol, coliflor, epazote y berenjena; las principales causas de consumo de hortalizas son por salud y nutrición; el 47% de la población tiene noción de técnicas de hidroponía, afirma que consumirían productos cultivados bajo dicha técnica, les gustaría tener su propio módulo hidropónico y le gustaría adquirir el paquete tecnológico; y finalmente, a 336 personas encuestadas estarían interesado en adquirir algún módulo hidropónico, de los cuales sólo 186 están dispuestos a pagar un valor de $1000.00 a$3000.00 pesos

Repositorios de tesis de posgrado: Capacidad del sistema académico NEA para la generación de depósitos de tesis de acceso libre. 16H315

Actividades realizadas durante el período: Exploración Teórica y Documental del Campo Investigativo; Búsqueda, localización y evaluación de bibliografía especializada; Búsqueda, selección y recuperación de documentos institucionales, nacionales e internacionales; Registro, interpretación y aplicación de la documentación descriptiva y explicativa, a la temática en estudio; Encuadre teórico-metodológico del proyect

Adapting Agriculture to Climate Change: A Synopsis of Coordinated National Crop Wild Relative Seed Collecting Programs across Five Continents

The Adapting Agriculture to Climate Change Project set out to improve the diversity, quantity, and accessibility of germplasm collections of crop wild relatives (CWR). Between 2013 and 2018, partners in 25 countries, heirs to the globetrotting legacy of Nikolai Vavilov, undertook seed collecting expeditions targeting CWR of 28 crops of global significance for agriculture. Here, we describe the implementation of the 25 national collecting programs and present the key results. A total of 4587 unique seed samples from at least 355 CWR taxa were collected, conserved ex situ, safety duplicated in national and international genebanks, and made available through the Multilateral System (MLS) of the International Treaty on Plant Genetic Resources for Food and Agriculture (Plant Treaty). Collections of CWR were made for all 28 targeted crops. Potato and eggplant were the most collected genepools, although the greatest number of primary genepool collections were made for rice. Overall, alfalfa, Bambara groundnut, grass pea and wheat were the genepools for which targets were best achieved. Several of the newly collected samples have already been used in pre-breeding programs to adapt crops to future challenges.info:eu-repo/semantics/publishedVersio