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Search Results: 1 - 10 of 516416 matches for " José G. S.; "
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Current energy crisis and its economic and environmental consequences: Intense human cooperation  [PDF]
Marcelo S. Sthel, José G. R. Tostes, Juliana R. Tavares
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.52A036
Abstract:

In this paper, the evolution of the energy use by human society is discussed, relating the energy, environmental and economic crisis, which appear to be closely linked. With the widespread use of fossil fuels since the industrial revolution, a major environmental problem was generated: the climate changes. The economic consequences of climate changes are discussed in Stern (2006). Possible solutions to confront climate change are presented in the Intergovernmental Panel on Climate Change (IPCC) report (2007). Some of these solutions are based on technological development, while others do not directly depend on the technology (paradigm shifts). Faced with the needs of a new paradigm suggested by the IPCC, the recent concept of sustainable triangular cells (2012) was introduced. The geometric representation of triangular cells, which can be linked to form a regular hexagon, is used to demonstrate a sustainable society, where human cooperation prevails. This model is in line with one of the pillars of the Third Industrial Revolution, indicated by Rifkin, where an intense collaboration between individuals in human society is suggested.

Ustilago maydis, a Delicacy of the Aztec Cuisine and a Model for Research  [PDF]
Claudia G. León-Ramírez, José Alejandro Sánchez-Arreguín, José Ruiz-Herrera
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.56024
Abstract:

Ustilago maydis is the causal agent of the disease known as corn smut or Huitlacohe; their natural hosts are maize (Zea mays L.) and its putative ancestor teocintle (Zea mays ssp. parviglumis and ssp. mexicana). In México there is an evidence of its use as human food since pre-hispanic times. Huitlacoche is a typical Mexican food with interesting nutritional properties and distinctive flavor. Its use in cuisine is considered as a culinary delicacy in Mexico and several parts of the world and the current consumption is increasing markedly, mainly due to its exclusive flavor different from any other known food. Huitlacoche contains proteins, carbohydrates, fats, minerals and vitamins that contribute to its nutritional value, also it has been reported that it contains proteins with balanced levels of essential amino acids, something which does not occur in corn having a deficiency mostly in lysine. The fungus also contains compounds with antioxidant properties, consequently it can be included in what are now known as nutraceutical foods. Besides its use in the food, this fungus has been used in different kinds of basic investigation, such as DNA recombination, signaling, cell biology, biotrophic plant-pathogen interactions and others. Its characteristics of dimorphism, and the detailed knowledge we have on its pathogenic development, that we describe in detail, make it an ideal subject for the analysis of fungal differentiation, and for the knowledge of the behavior of the highly aggressive plant pathogens that are members of its taxonomic group, the Ustilaginales. In the present communication we make a thorough review of the nutritional characteristics of U. maydis, its life cycle, and the molecular bases of its differentiation, morpohogenesis

Ecología alimentaria de Parodon tortuosus (Pisces, Characiformes) en el río de la Suela (Córdoba, Argentina)
Pelegrin,Nicolás; Haro,José G;
Ecolog?-a austral , 2004,
Abstract: the feeding of 71 parodon tortuosus individuals from de la suela river, córdoba province, argentina, was analized. the diet was mostly composed by algae (chlorophyta, cyanophyta and chrisophyta which comprise 92.1% of the total dry weight of the stomach contents), with a few animal items (7.9%) such as diptera (chironomidae and simuliidae), ephemeroptera and trichoptera. there were no significant differences in the diet between cold and warm seasons neither between juveniles and adults. parodon tortuosus is an algae-eating fish that lives in small waterfalls with rocky substrates. it behaves as a browser or as a grazer according to its needs, but it can eventually ingest animal food mixed with the algae.
Euglenophyta from lower basin of the Caura River, Venezuela
DELGADO,José G.; SáNCHEZ,Luzmila;
Acta Botánica Venezuelica , 2007,
Abstract: this study gives information on taxonomy and presence of euglenophyta occurring in various types of water bodies from the lower basin of the caura river and its floodplain, bolívar state, venezuela. specimens were collected between march 1998 and february 2000. twenty one species were identified, among them 13 taxa new for venezuela. all taxa are illustrated using original drawings. the new taxa for venezuela are: euglena gasterosteus skuja, e. gaumei allorge & lefèvre, e. rustica schiller, strombomonas napiformis (playfair) deflandre, trachelomonas piscatoris var. sparsespinosa huber-pestalozzi, t. ovalis (daday) lemmermann, t. acanthophora stokes var. speciosa swirenko, phacus margaritatus pochmann, p. acuminatus var. discifera (pochmann) huber-pestalozzi, p. rodriguesiae conforti, p. onyx pochmann, p. orbicularis f. communis popova and p. horridus pochmann.
Brotación,fertilidad de brotes laterales y ubicación del racimo en el cultivar de VID Tucupita en condiciones trópicales
Valor G,Oswaldo; Sánchez L,José;
Bioagro , 2003,
Abstract: six-year old plants of the table grape cultivar ?tucupita? were selected to study total and fertile bud break, location and frequency of clusters on main and lateral shoots, and fertility of the lateral shoots, at the instituto de la uva, in el tocuyo, lara state, venezuela (9°48? n, 69°48? w, 630 m.a.s.l). plants were grafted on ?criolla negra?, spaced 3 x 2 m, trained in double cordon and supported on arbor trellis system. pruning was managed leaving on the average 10 to 12 spurs per plant with 1 to 3 nodes each. four groups of plants were chosen with 32 main shoots that were tagged as fertile and non fertile shoots, and grouped as free growing or tipped to 10 nodes in an acrotonous way. bud break on spurs was 54 ± 1.84 % and additional bud break on arms and basal part of spurs was 30 ± 1.75 %. fertile bud break was 33 ± 1.78% averaging 1.17 ± 0.12 clusters per shoot. the clusters were located between node positions from 3 to 11, being the highest frequency in the position 5. clusters on positions 9 to 11 showed an intermediate structure between clusters and tendrils. total lateral bud break was present along positions 1 to 15 of the main shoot. fertile lateral shoots were present in all those node positions except on the position 1 which was always infertile. the greatest frequency of fertile lateral shoots was observed in positions 2 to 8. the infertile main shoots always showed the highest lateral bud break. tipping did not influence the development of fertile lateral shoots but stimulated a higher lateral break mainly in those buds located near the apical portion of the main shoot.
Euglenophyta from lower basin of the Caura River, Venezuela Euglenophyta de la cuenca baja del Río Caura, Venezuela
José G. DELGADO,Luzmila SáNCHEZ
Acta Botánica Venezuelica , 2007,
Abstract: This study gives information on taxonomy and presence of Euglenophyta occurring in various types of water bodies from the lower basin of the Caura River and its floodplain, Bolívar State, Venezuela. Specimens were collected between March 1998 and February 2000. Twenty one species were identified, among them 13 taxa new for Venezuela. All taxa are illustrated using original drawings. The new taxa for Venezuela are: Euglena gasterosteus Skuja, E. gaumei Allorge & Lefèvre, E. rustica Schiller, Strombomonas napiformis (Playfair) Deflandre, Trachelomonas piscatoris var. sparsespinosa Huber-Pestalozzi, T. ovalis (Daday) Lemmermann, T. acanthophora Stokes var. speciosa Swirenko, Phacus margaritatus Pochmann, P. acuminatus var. discifera (Pochmann) Huber-Pestalozzi, P. rodriguesiae Conforti, P. onyx Pochmann, P. orbicularis f. communis Popova and P. horridus Pochmann. Este estudio presenta información sobre la taxonomía y presencia de las euglenofitas en varios cuerpos de agua pertenecientes a la cuenca baja del Río Caura y su planicie de inundación, estado Bolívar, Venezuela. Los especímenes fueron recolectados entre marzo de 1998 y febrero de 2000. Se identificaron 21 especies, de las cuales 13 taxa son nuevos registros para Venezuela. Todos los taxa son ilustrados usando dibujos originales. Los taxa nuevos para Venezuela son: Euglena gasterosteus Skuja, E. gaumeiAllorge & Lefèvre, E. rustica Schiller, Strombomonas napiformis (Playfair) Deflandre, Trachelomonas piscatoris var. sparsespinosa Huber-Pestalozzi, T. ovalis (Daday) Lemmermann, T. acanthophora Stokes var. speciosa Swirenko, Phacus margaritatus Pochmann, P. acuminatus var. discifera (Pochmann) Huber-Pestalozzi, P. rodriguesiae Conforti, P. onyx Pochmann, P. orbicularis f. communis Popova y P. horridus Pochmann.
Brotación,fertilidad de brotes laterales y ubicación del racimo en el cultivar de VID Tucupita en condiciones trópicales Bud break, fertility of lateral shoots and location of clusters on the main shoot of grapevine ‘Tucupita’ under tropical conditions
Oswaldo Valor G,José Sánchez L
Bioagro , 2003,
Abstract: Con el objeto de estudiar la brotación total y fértil, la ubicación, frecuencia de brotes laterales fértiles y, la ubicación y frecuencia de racimos en el sarmiento del cultivar de vid Tucupita, se seleccionaron 32 plantas de 6 a os de edad en la estación experimental del Instituto de la Uva en El Tocuyo, estado Lara, Venezuela (9° 48’ N; 69° 48’ W; 630 msnm). Las plantas estaban injertadas sobre el patrón ‘Criolla Negra’ plantadas a 3 x 2 m, soportadas en un sistema de emparrado y conducidas a dos brazos. La poda fue realizada dejando en promedio de 10 a 12 pulgares por planta cada uno con 1 a 3 nudos. Se marcaron cuatro lotes de plantas compuestos de 32 sarmientos, cada uno identificado como brote primario fértil, no fértil a crecimiento libre, e iguales a los anteriores pero despuntados a diez nudos contando en forma acrópeta. La brotación de yemas en los pulgares fue de 54 ± 1,84 % con 30 ± 1,75 % de brotes adicionales ubicados en madera de ciclos anteriores y parte basal de los pulgares. La brotación fértil fue de 33 ± 1,78 % con un promedio de 1,17 ± 0,12 racimos por brote. Los racimos florales se presentaron entre las posiciones nodales 3 a la 11 del sarmiento, con la mayor frecuencia en la posición 5. Los racimos en las posiciones 9 a la 11 presentaron una estructura intermedia entre racimo y zarcillo. La brotación lateral total se presentó en las posiciones 1 a la 15 del sarmiento. Los brotes laterales fértiles se presentaron en todas estas posiciones nodales a excepción del nudo 1 el cual fue siempre infértil. La mayor frecuencia de brotes laterales fértiles ocurrió en las posiciones 2 a la 8. Los sarmientos infértiles mostraron una mayor tendencia a brotación lateral. El despunte estimuló una mayor brotación lateral en los sarmientos principalmente en las posiciones nodales más cercanas al extremo despuntado, mientras que no tuvo ninguna influencia sobre la fertilidad de los brotes laterales. Six-year old plants of the table grape cultivar ‘Tucupita’ were selected to study total and fertile bud break, location and frequency of clusters on main and lateral shoots, and fertility of the lateral shoots, at the Instituto de la Uva, in El Tocuyo, Lara State, Venezuela (9°48’ N, 69°48’ W, 630 m.a.s.l). Plants were grafted on ‘Criolla Negra’, spaced 3 x 2 m, trained in double cordon and supported on arbor trellis system. Pruning was managed leaving on the average 10 to 12 spurs per plant with 1 to 3 nodes each. Four groups of plants were chosen with 32 main shoots that were tagged as fertile and non fertile shoots, and grouped as free growing or tippe
Consideraciones sobre los ensayos de laboratorio
Gómez Cortés José Gabriel
Ingeniería e Investigación , 1982,
Abstract: Texto de la conferencia dictada por el autor en el Instituto de la Construcción y del Cemento en Madrid. Eduardo Torroja, Espa a, como asistente al IX Curso de Estudios Mayores de la Construcción sobre "LA EDIFICACION Y SU PATOLOGíA". Se analizan aspectos sobre: los criterios para solicitar ensayos, muestreo, variabilidad de resultados y reproducibilidad de ensayos, criterios de aceptación e importancia de la retroalimentación.
Bondad de los criterios del ACI para calificar la calidad de un hormigón
Gómez Cortés José Gabriel
Ingeniería e Investigación , 1985,
Abstract: Se analizan los criterios de aceptación de un hormigón por resultados de resistencia, bajo el punto de vista de las curvas características de operación (Curvas O-C), se concluye que los criterios del ACI dan al consumidor de hormigón un riesgo alto de aceptar un producto que no cumpla con las especificaciones.
Determinación del índice esclerométrico en hormigones: factores que lo afectan
Gómez Cortés José Gabriel
Ingeniería e Investigación , 1987,
Abstract: Se analizan los principales factores que influyen en la determinación de la resistencia mecánica de un concreto evaiuada mediante índice esclerométrico: tipo de cemento, contenido, tama o y tipo del agregado, forma y textura de la superficie, posición del aparato, cabo rotación superficial, capas diferentes, condiciones de humedad superficiales, destreza del operador, Se concluye que la dispersión de resultados es bastante amplia como para que sea de utilidad en casos prácticos
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