Interciencia articles from March 2006

Interciencia archives from March 2006

Kurt Godel's centenary/Centenario de Kurt Godel/Centenario de Kurt Godel.(EDITORIAL)(Editorial)
March 1, 2006... The results published by Kurt Godel during the decade 1929-1939 transformed completely mathematical logic. His doctoral dissertation Uber die Vollstandigkeit des Logikkalculus, of 1929, shows that the provable statements in predicate calculus...

An alternative to principal components regression based on regression Biplot/Alternativa a la regresion con componentes principales basada en biplot de regresion/Alternativa a regressao com componentes principais baseada em biplot de regressao.
March 1, 2006... SUMMARY An alternative estimation method, herein termed Regression Biplots, is shown to approximate a data matrix biplot fitting bilinear models. The biplots and the Principal Components Regression are similar methods when the variables...

Models of crown size in the Scots pine pinus sylvestris L. in forests in Central Spain/Modelos del Tamano de copa de Pinus sylvestris L. en bosques del Centro de España/Modelos do Tamanho da copa de pinus sylvestris L. nos bosques do Centro da España.
March 1, 2006... SUMMARY Crown profile equations can be used to characterize the crown closure, crown-area profile, crown volume and crown porosity of a stand to predict individual-tree height growth, basal area growth and the probability of mortality in...

Methods of biogeographic analysis and their application to the distribution of Mexican gymnosperms/Los metodos de analisis biogeografico y su aplicacion a la distribucion de las gimnospermas en Mexico/Os metodos de analise biogeografico e sua aplicacao na distribuicao das gimnospermas no Mexico.
March 1, 2006... SUMMARY Biogeography is a discipline included in comparative biology that studies the distribution of organisms; the distributional patterns of organisms are analyzed through the application of different methods, depending on the question...

Mesquite gum: alternative of industrial use/Goma de mezquite: una alternativa de uso industrial/Goma de mesquite: uma alternativa de uso industrial.
March 1, 2006... SUMMARY Mesquite (Prosopis spp.) is a leguminous tree widespread in arid and semi-arid zones of the world. In stress conditions, the tree exudates a vitreous gummy material known as mesquite gum. This polysaccharide is an arabinogalactan...

Effect of blended learning on student's motivation and learning performance/Efecto del blendend learning sobre el rendimiento y la motivacion de los estudiantes/Efeito do blended learning sobre o rendimento e a motivacao dos estudantes.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY This study examines different amounts of blended learning during the learning process, required in order to influence the learning performance and motivation of the students in an undergraduate course. The learning strategy used is...

Study of nitrogen fixation by tropical legumes in acid soil from Venezuelan savannas using [sup.15]N/Estudio de la fijacion de nitrogeno por leguminosas tropicales en suelos acidos de sabanas venezolanas utilizando [sup.15]N/Estudo da fixacao de nitrogenio por leguminosas tropicais em solos acidos de savanas venezuelanas utilizando [sup.15]N.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY In Venezuela, around 70% of cultivable land presents limitations by acid pH and low availability of P and N in the soil. Sustainable N-replenishment strategies, particularly for low-to medium-input systems on acid soil of savannas,...

Inheritance of resistance to the venezuelan maize dwarf mosaic virus in maize lines/Herencia en lineas de maiz de la resistencia a la raza venezolana del virus del mosaico enanizante del maiz/Heranca, em linhas de milho, da resistencia a raca venezuelana do virus do mosaico do nanismo do milho.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY The incidence of the Venezuelan strain of the Maize Dwarf Mosaic Virus (MDMV-V) has increased since 1970 in experimental and commercial fields of sorghum (Sorghum bicolor) and maize (Zea mays). MDMV-V is the most important virus in...

Mass transfer prediction by artificial neural networks in osmotically dehydrated fruits/Prediccion mediante redes neuronales artificiales de la transferencia de masa en frutas osmoticamente deshidratadas/Predicao mediante redes neuronais artificias da transferencia de massa em frutas osmoticamente desidratas.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY The purpose of this work was to predict the macroscopic behavior of the two main mass transfer phenomena in three fruits (melon, papaya and apple) osmotically dehydrated. The effect of five process variables was considered: type of...

Physical-geographical landscapes of the mangroves of la mancha lagoon, Veracruz, Mexico/Los paisajes fisico-geograficos de los manglares de la laguna de La Mancha, Veracruz, Mexico/As paisagens fisico-geograficas dos manguezais da lagoa de la mancha Veracruz, Mexico.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY The mangrove ecosystems which surround the La Mancha lagoon in Veracruz, Mexico, are characterized by the high complexity of its landscapes in conditions of adequate conservation. This work deals on the structure and composition of...

Species richness and similarity between invertebrates living in floating plants in the parana river floodplain/Riqueza de especies y similaridad de los invertebrados que viven en plantas flotantes de la planicie de inundacion del rio Parana (Argentina)/Riqueza de especies e similaridade dos invertebrados que vivem em plantas flotantes da planicie de inundacao do rio parana (Argentina).(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY An intensive survey was carried out in 5 sites of the Parana River floodplain with similar physical and chemical water condition, dominated by different macrophytes. To test the hypothesis that the invertebrate species richness is...

Effect of tillage systems and green manure (Labkab purpureus L) incorporation on edafic respiration in a haplic yermosol/Efecto de sistemas de labranza e incorporacion de abono verde (Lablab purpureus L) sobre la respiracion edafica en un yermosol haplico/Efeito de sistemas de lavragem e incorporacao de abono verde (Lablab purpureus L) sobre a respiracao edafica em um yermosol haplico.(REPORTS/COMUNICACIONES/COMUNICACOES)
March 1, 2006... SUMMARY The adoption of reduced tillage fallow systems and green manure incorporation in irrigated zones of Mexico has been very limited, in spite of numerous reports about the benefits from those practices. Conventional tillage;...

Annelida polychaeta I.(CRITICA DE LIBROS)(Reseña de libro)
March 1, 2006... Vieitez JM, Alos C, Parapar J, Besteiro C, Morera J, Nunez J, Laborda J, San Martin G. (2004) Annelida Polychaeta I Ramos MA (Coord. editorial) Serie Fauna Iberica, Vol. 25. Museo Nacional de Ciencias Naturales/CSIC. Madrid, Espana. 530...

Forthcoming events/Reuniones venideras/Proximas reunioes.(Calendario)(Ilustración)
March 1, 2006... REUNIONES VENIDERAS / FORTHCOMING EVENTS / PROXIMAS REUNIOES REUNION / EVENT LUGAR / LOCATION XLI CONGRESO Manzanillo, Colima, Mexico NACIONAL DE ENTOMOLOGIA III CONGRESO ...