994 resultados para Campos de Altitude


Relevância:

20.00% 20.00%

Publicador:

Resumo:

UANL

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Tesis (Doctorado en Ciencias Biológicas con Especialidad en Biología Celular y Genética) UANL

Relevância:

20.00% 20.00%

Publicador:

Resumo:

[Tesis] (Doctor en Ciencias con especialidad en Microbiología) U.A.N.L. Facultad de Ciencias Biológicas, 2008

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Actinomycetes are gram-positive, free-living, saprophytic bacteria widely distributed in soil, water and colonizing plants showing marked chemical and morphological diversity. They are potential source of many bioactive compounds, which have diverse clinical effects and important applications in human medicine. In the present work, we have studied some of the physiological and biochemical characteristics of 36 actinomycete strains isolated from the shola soils of tropical montane forest; a relatively unexplored biodiversity hotspot. Ability of actinomycetes isolates to ferment and produce acids from various carbohydrate sources such as innositol, mannose, sorbitol, galactose, mannitol, xylose, rhamnose, arabinose, lactose and fructose were studied. Almost all the carbon compounds were utilized by one or other actinomycete isolates. The most preferred carbon sources were found to be xylose (94.44%) followed by fructose and mannose (91.66%). Only 41.76% of the isolates were able to ferment lactose. The ability of actinomycetes isolates to decompose protein and amino acid differ considerably. 72.22% of the isolates were able to decompose milk protein casein and 61.11% of the isolates decompose tyrosine. Only 8.33% of the strains were able to decompose amino acid hypoxanthine and none of them were able to decompose amino acid xanthine. Potential of the actinomycetes isolates to reduce esculin, urea and hippurate and to resist lysozyme was also checked. 91.66% of the isolates showed ability to decompose esculin and 63.88% of the isolates had the capacity to produce urease and to decompose urea. Only 25% of the isolate were able to decompose hippurate and 94.44% showed lysozyme resistance

Relevância:

20.00% 20.00%

Publicador:

Resumo:

TThe invention of novel antibiotics and other bioactive microbial metabolites continues to be an important aim in new drug discovery programmes. Actinomycetes have the potential to synthesize lots of diverse biologically vigorous secondary metabolites and in the last decades actinomycetes became the most productive source for antibiotics. Therefore in the present study we analyze the antibacterial activity of the actinomycetes isolated from grassland soil samples of Tropical Montane forest. A total of 33 actinomycete strains isolated were characterized and screened for antibacterial activities using well diffusion method against six specific pathogenic organisms. Identification of the isolates revealed that the majority of them were belonging to Streptomycetes followed by Nocardia, Micromonospora, Pseudonocardia, Streptosporangium, Nocardiopsis and Saccharomonospora. Among the 33 isolates, Gr1 strain showed antagonistic activity against all checked pathogens. Nine strains showed antibacaterial activity against Listeria, Vibrio cholera, Bacillus cereus, Staphylococcus aureus and Salmonella typhi and only 2 strains (Gr1and Gr25) showed antagonism to E. coli. The overall percentage of activity of actinomycetes isolates against each pathogenic bacterium was also calculated. While 63.63% of the actinomycetes were antagoinistic against Listeria, Vibrio cholerae, and Bacillus cereus, 60.6% of them were antagonistic to Staphylococcus aureus. Very few isolates (6.06%) showed antibacterial activity against E. coli. In general most of the actinomycetes isolates were antagonistic to grampositive bacteria such as Listeria, Bacillus and Staphylococcus than Gram-negative bacteria Vibrio cholerae, E. coli and Salmonella

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Previous research has shown that site-specific nitrogen (N) fertilizer recommendations based on an assessment of a soil’s N supply (mineral N testing) and the crop’s N status (sap nitrate analysis) can help to decrease excessive N inputs for winter wheat on the North China Plain. However, the costs to derive such recommendations based on multiple sampling of a single field hamper the use of this approach at the on-farm level. In this study low-altitude aerial true-color photographs were used to examine the relationship between image-derived reflectance values and soil–plant data in an on-station experiment. Treatments comprised a conventional N treatment (typical farmers’ practice), an optimum N treatment (N application based on soil–plant testing) and six treatments without N (one to six cropping seasons without any N fertilizer input). Normalized intensities of the red, green and blue color bands on the photographs were highly correlated with total N concentrations, SPAD readings and stem sap nitrate of winter wheat. The results indicate the potential of aerial photography to determine in combination with on site soil–plant testing the optimum N fertilizer rate for larger fields and to thereby decrease the costs for N need assessments.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Resumen basado en el de la publicación

Relevância:

20.00% 20.00%

Publicador:

Resumo:

La profesora Paulina Visitaci??n Santos Rivero expone sus impresiones con motivo de la visita realizada al centro belga Vrije Basisschool 'De Minnestraal', en Lebbeke. Este centro es coordinador del proyecto de cooperaci??n del programa Comenius en el que participa el CP Los Campos de Corvera de Asturias.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Descripci??n del centro Z??kladn?? Skola, de la Rep??blica Checa, tras la visita realizada por profesorado del Colegio P??blico Los Campos de Corvera de Asturias, en el marco de la Acci??n Commenius en la que ambos centros participan conjuntamente. Los alumnos checos participan en el proyecto mediante la elaboraci??n de cuentos.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

El proyecto Comenius en el que participa el Colegio Público Los Campos de Corvera (Asturias) se titula 'Mision colourful'. Se trata de un juego interactivo que se realiza con otras escuelas asociadas de Inglaterra y de la República Checa. A lo largo del curso los grupos de cuarto, quinto y sexto de Primaria se retarán con los alumnos del mismo nivel del St. Brigid's Catholic Primary School of Liverpool (Inglaterra).

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Se trata de un cuaderno did??ctico dirigido a escolares en el que se desarrollan los valores naturales y paisaj??sticos de la zona de Es Trenc-Salobrar de Campos. Se proponen actividades descubrimiento del ??rea, sus recursos como humedal que concentra una riqu??sima avifauna y el sistema dunal del ??ltimo arenal sin urbanizar de la isla. El cuaderno cuenta con una introducci??n en la que se trata la localizaci??n del ??rea, situaci??n jur??dica y legislativa, zonificaci??n y la formaci??n geol??gica. En segundo lugar, se real itinerario compuesto por diez estaciones, en el que se conjugan la descripci??n de los rasgos naturales y paisaj??sticos com actividades preparatorias y para realizar durante la visita. Las paradas trabajan aspectos fundamentales del medio natural como la explotaci??n de las aguas, las salinas y la extracci??n de la sal, las pedreras, la maquia, la formaci??n de las dunas, la playa, el salicornar y la avifauna de la zona. Una de las paradas se centra en el yacimiento arqueol??gico de Na Guardis.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Se recoge la oferta de campos de aprendizaje de las Islas Baleares para el profesorado y alumnado de las Islas Baleares, a los que se ofrece la posibilidad de realizar estancias en un medio singular. Esta red está formada por los campos de aprendizaje de Son Ferriol, Es Palmer, sa Cala, es Pinaret y Orient.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Esta investigación se realizó con el apoyo de ECOPETROL, entidad que suministro los datos, la cual indico que dicha información tiene un carácter de confidencialidad, razón por la cual se cambiaron los nombres de los campos y de los perfiles de precios. Por lo tanto este estudio solo puede ser utilizado con fines académicos y en ningún momento se constituye en información para presentar una oferta económica. Crear expectativas en la mente de los inversionistas, presentando oportunidades de inversión y crecimiento, generan alternativas que les brindaran opciones, basadas en análisis de escenarios, oportunidades y amenazas, para la mejor toma de decisiones de inversión. Es por esto que la Industria del petróleo ante un escenario de precios que va en aumento en los últimos años se constituye en un sector que puede configurar oportunidades, para inversionistas que quieran obtener una buena rentabilidad y que su nivel de aversión al riesgo no sea tan alto.