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			Ordenar por:  Relevância Autor Título Ano Registros recuperados: 415 Primeira ... 13 14 15 16 17 18 19 20 21 ... Última Variación en la susceptibilidad a insecticidas de Bemisia tabaci biotipo B alimentada sobre diferentes hospederos Phyton Cerna-Chávez,E; Martínez-Martínez,Y; Landeros-Flores,J; Aguirre-Uribe,L; Sánchez-Valdes,V; Cepeda-Siller,M; Hernández-Bautista,O; Ochoa-Fuentes,YM. Bemisia tabaci (Gennaadius) biotipo B está catalogada como una de las plagas más importantes, debido al número de hospederos y a las pérdidas económicas que ocasiona. Su control se ha basado en la aplicación de productos químicos, lo que ha provocado problemas de resistencia. Sin embargo el hospedero también puede influir en la inducción de una resistencia hacia los plaguicidas. Es por ello, que la presente investigación tiene como objetivo, evaluar la susceptibilidad de poblaciones de B. tabaci biotipo B desarrolladas en diferentes hospederos a tres insecticidas de diferente grupo toxicológico. Se recolectaron y criaron poblaciones de B. tabaci biotipo B, en seis diferentes hospederos (tres cultivos y tres malezas asociadas: Solanum lycopersicum, Solanum... Tipo: Info:eu-repo/semantics/article Palavras-chave: Mosquita blanca; Susceptibilidad a insecticidas; Hospederos. Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200013 Accumulation of silver nanoparticles and its effect on the antioxidant capacity in Allium cepa L Phyton Juárez-Maldonado,A; Rosales-Velázquez,JL; Ortega-Ortiz,H; Cabrera-De-la-Fuente,M; Ramírez,H; Benavides-Mendoza,A. Nanotechnology is currently an important worldwide study field because it provides control on matter at a nanometric scale. In food and agricultural fields, the applications of this technology are in early stages. Onion is one of the main vegetables grown in the world. Onion is a low calorie food which contains a large amount of flavonoids. In this work, silver nitrate application in onion was evaluated. An onion crop was developed at the University Antonio Narro in Saltillo, Mexico. Two methods of silver nitrate application were used (a nutritive solution: 0, 20, 40 and 80 mg/L of AgNO3; and foliar spray: 0, 20 and 40 mg/L of AgNO3). The samples were taken at 30, 60 and 90 days after transplanting. Total antioxidant capacity, silver accumulation and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Nanotechnology; Onion; Silver nitrate; Nanoparticles. Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100013 Quantitative measures of leaf epidermal cells as a taxonomic and phylogenetic tool for the identification of Stanhopea species (Orchidaceae) Phyton Foroughbakhch,R; Ferry Sr,RJ; Hernández-Piñero,JL; Alvarado-Vázquez,MA; Rocha-Estrada,A. Orchids of the genus Stanhopea are currently identified only by their floral structure characteristics. A statistical analysis of a significant number of species of this genus disclosed that measurements of adaxial and abaxial epidermal cell surface areas can be correlated with specific recognized species by a leaf printing method. This allows an objectively either positive or nearly positive confirmation of the identity of a species in the absence of flowers and without damage to plants. When ordering the mean values obtained for these surface areas in each species in a decreasing order, a correlation was observed in a hierarchical way that went from primitive to more advanced floral forms. This reflects the evolutionary radiation of the genus. It is... Tipo: Info:eu-repo/semantics/article Palavras-chave: Stanhopea; Quantitative taxonomy; Morphometry; Leaf printing; Orchidaceae. Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100010 Investigación y necesidades de la sociedad Phyton Busso,Carlos A. Tipo: Info:eu-repo/semantics/other Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100001 Histocytological examination on organogenesis and somatic embryogenesis of HBsAg-transgenic cherry tomato mutant Phyton Guan,Z-J; Guo,B; Huo,Y-L; Dai,J-K; Wei,Y-H. The initiation and development of organogenic buds and somatic embryos in HBsAg-transgenic cherry tomato (Lycopersicum esculentum var. cerasiforme) mutant were studied histologically. The leaf explants of the mutant were cultured on Murashige & Skoog (MS) basal medium supplemented with 6-BA 1.0 mg/L and IAA 0.05 mg/L for callus induction. Histological studies on the leaf explants of the mutant at various developmental stages revealed that organogenic buds first appeared in the axillary position of explants on the 14th cultured day, and then somatic embryos formed in the same mutant explants after 35 days of culture. Transmission electron microscopy and scanning electron microscopy indicated that there were significant changes in morphology and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Histocytological; Organogenesis; Somatic embryogenesis; HBsAg; Transgenic; Cherry tomato; Mutant. Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100008 Effect of vermicompost on the growth and health of Impatiens wallerana Phyton Asciutto,K; Rivera,MC; Wright,ER; Morisigue,D; López,MV. Rhizoctonia solani damping-off and root rot diseases are frequent in impatiens crops in Buenos Aires. Their control is based in fungicide use. In a sustainable nursery production, beneficial microorganisms that develop in organic amendments may suppress diseases and promote plant growth. The aim of this work was to evaluate the effect of different proportions of vermicompost on the growth and health of patience-plant (Impatiens wallerana). The experiment was carried out in a polyethylene greenhouse. Treatments were defined as follows: infested substrate, substrate, sterilized substrate, vermicompost, and vermicompost mixed with infested substrate at 75, 50 and 25% by volume. Seeds of I. wallerana were sown in plugs containing the different substrates.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Vermicompost; Growth; Damping-off; Impatiens wallerana. Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572006000100012 Effect of man-made electromagnetic fields on common Brassicaceae Lepidium sativum (cress d'Alinois) seed germination: a preliminary replication study Phyton Cammaerts,MC; Johansson,O. Under high levels of radiation (70-100 µW/m2 =175 mV/m), seeds of Brassicaceae Lepidium sativum (cress d'Alinois) never germinated. In fact, the first step of seeds' germination ‒ e.g. imbibitions of germinal cells ‒ could not occur under radiation, while inside the humid compost such imbibitions occurred and roots slightly developed. When removed from the electromagnetic field, seeds germinated normally. The radiation was, thus, most likely the cause of the non-occurrence of the seeds' imbibitions and germination. Tipo: Info:eu-repo/semantics/article Palavras-chave: Imbibitions; Seeds; Water; Wireless waves. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100019 Diferenciación geográfica de poblaciones de chile silvestre (Capsicum annuum L. var. glabriusculum) del noroeste de México Phyton López-España,RG; Hernández-Verdugo,S; Parra-Terraza,S; Porras,F; Pacheco-Olvera,Antonio; Valdez-Ortiz,A; Osuna-Enciso,T; Muy-Rangel,MD. El chile silvestre (Capsicum annuum L. var. glabriusculum) es un valioso recurso genético para la agricultura y la alimentación. Los patrones de variación de 12 caracteres morfo-demográficos de 17 poblaciones de chile silvestre colectadas a lo largo de un gradiente latitudinal y climático en el noroeste de México fueron analizados en condiciones uniformes de invernadero. Los datos de dichas características se examinaron con análisis univariados y multivariados. La relación entre la variación fenotípica y la latitud de origen de las poblaciones se probó mediante análisis de regresión lineal. Se encontró elevada variación dentro y entre las poblaciones en todas las características medidas. Los análisis de varianza univariados y de componentes principales... Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum annuum silvestre; Recursos genéticos; Gradiente latitudinal; Diferenciación entre poblaciones; Variación genética. Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100018 Ethnobotanical study and conservation status of trees in the district Sargodha, Punjab, Pakistan Phyton Shah,A; Rahim,S; Bhatti,KH; Khan,A; Din,N; Imran,M; Mohsin,M; Ishtiaq,M; Nabila,A; Ansari,A; Hussain,S; Zafar,M; Mushtaq,M; Mumtaz,E; Iqbal,J. Sargodha district is one of the least studied regions of Pakistan regarding its ethnobotanical values. This paper is the frst report related to the documentation and conservation status of the tree species in the Sargodha district, and their folk ethnobotanical uses. An interview base survey was conducted in the study area in 2010-2013. The ethnobotanical data revealed the use of 100 tree species (6 gymnosperms, 94 angiosperms) belonging to 77 genera (6 gymnosperms, 71 angiosperms) and 39 families (4 gymnosperms, 35 angiosperms), with the Fabaceae ranking first with 19 tree species, followed by the Moraceae (12 species). Tree species like Aegle marmelos, Butea monosperma, Diospyrus malabarica, Gmelina arborea, Kigelia africana, Manilkara hexandra,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ethnobotanical study; Medicinal plants; Sargodha; Pakistan. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100006 Seed rain in and between vegetation patches in arid Patagonia, Argentina Phyton Bonvissuto,GL; Busso,CA. Seed rain has ecological consequences on plant community structure. This study was conducted in the Monte Austral Neuquino nearby the town of Picún Leufú, Province of Neuquén, Argentina, within an area of 15 km x 15 km (39º 20 32' S; 69º19 30' W). Studies were conducted at two sites, distant 1.5 km from one another. Vegetation is distributed on the soil surface as vegetation patches. Four superficial locations may be found in the soil of these patches: location 1, small dune accumulated under the lee; location 2, found at the edge of the small dune, and below the major grass canopies and tallest shrubs; location 3, located at the edge of the vegetation patch, and location 4 which includes the uncovered corridors among vegetation patches. Seed rain was... Tipo: Info:eu-repo/semantics/article Palavras-chave: Seed rain; Shrub and grass species; Vegetation patches; Arid Argentina. Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100005 Extracción de macronutrientes en banano 'Dominico' (Musa spp.) Phyton Castillo González,AM; Hernández Maruri,JA; Avitia García,E; Pineda Pineda,J; Valdéz Aguilar,LA; Corona Torres,T. El banano es uno de los frutales más importantes en el mundo. México ocupa el octavo lugar en la producción mundial. El desbalance de nutrientes es uno de los principales problemas agronómicos que enfrenta este cultivo. Los programas actuales de fertilización deben basarse en la demanda de nutrientes de los cultivos durante sus etapas fenológicas. A este respecto no existe información para banano 'Dominico' que es uno de los cultivares más importantes en México. Los objetivos de esta investigación fueron evaluar la acumulación y distribución de biomasa y de macronutrientes en plantas de banano 'Dominico' en etapa productiva. Esto contribuirá a determinar la cantidad de elementos y el momento en que los mismos se deben de abastecer. Se seleccionaron al azar... Tipo: Info:eu-repo/semantics/article Palavras-chave: Musa spp.; Acumulación de materia seca; Distribución de biomasa; Distribución de minerales; Extracción de nutrientes. Ano: 2011 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100010 Colección y caracterización de Chile (Capsicum spp) en Tabasco, México Phyton Castañón-Nájera,G; Latournerie-Moreno,L; Mendoza-Elos,M; Vargas-López,A; Cárdenas-Morales,H. Se realizó una caracterización morfológica in situ de Capsicum spp en 13 localidades del estado de Tabasco, México, durante 2004 y 2005. El objetivo fue colectar y conocer diferentes morfotipos de chile que crecen en forma silvestre y cultivada. Se encontraron 11 morfotipos de chile. La mayoría de ellos fueron silvestres (Amashito, Corazón de pollo, Muela, Garbanzo, Garbanzo raro y Desconocido) y correspondieron a C. annuum. Otro fue semisilvestre (Picopaloma)y correspondió a C. frutescens. El resto de los morfotipos fueron comerciales y pertenecieron a C. annuum y C. chinense Jacq. Los datos se analizaron mediante estadística multivariada. El análisis de componentes principales (ACP) indicó que con los primeros cuatro componentes principales se explicó el... Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum spp; Morfotipos de chile; Métodos multivariados; Diferencias morfológicas; Normalidad Multivariada. Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100016 Rol de las macroalgas en el biomonitoreo de la contaminación en «Marchica», la laguna de Nador Phyton Ben Chekroun,K; Moumen,A; Rezzoum,N; Sánchez,E; Baghour,M. The Aquatic system contamination by organic pollutants and heavy metals is one of the most serious problems that might face the environment and organisms as a whole. Interestingly, the accumulation of these pollutants is due to the anthropogenic activity, namely the intensive use of fertilizers to obtain high yields in crop production. In this paper, we compared the levels of chlorophylls, proteins, dry weight and sucrose in some red (Alsidium sp. and Gracilaria sp.) and green algae (Ulva sp.) collected from Mohandis, near Kariat and Bou Areg. Our results indicate that the algae collected nearby Bou Areg, an area well-known for its high agricultural activity, contained high levels of pigments, proteins and sugars. From the chlorophyll results, we conclude... Tipo: Info:eu-repo/semantics/article Palavras-chave: Algae; Biomonitoring; Carbohydrates; Nador lagoon; Phytoremediation; Pigments; Pollution; Proteins. Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100005 Comparison of four DNA extraction methods on various tissues and types of Sechium edule (Jacq.) Sw Phyton Galindo-Tovar,ME; Gasperin-Sanatta,VS; Alejandre-Rosas,JA; Leyva-Ovalle,OR; Murguía-González,J; Lee-Espinosa,HE; Landero-Torres,I. Sechium edule is an important crop in Southern Mexico and Central America, and México was the main producer, with 53% of the world production in 2012. This species presents high levels of morphological variation that have resulted in different types of varieties not clearly defned. However, morphological characteristics have not been sufficient to classify S. edule varieties, and it has been difficult to study the species genetic diversity. Because of it, there is a need to develop methods for studying the genetic diversity in S. edule. In this regard, the first step is to find a suitable DNA extraction method. For this reason, in this study four DNA extraction methods (two laboratory protocols, and two commercial kits) were compared for their efficiencies... Tipo: Info:eu-repo/semantics/article Palavras-chave: Sechium edule; Chayote; DNA quality; DNA yield. Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200011 Variabilidad del número de tallos en plántulas de Lotus tenuis creciendo en alta densidad Phyton Entio,LJ; Mujica,MM. El bajo vigor de las plántulas de Lotus tenuis, leguminosa estratégica para mejorar pastizales de la Pampa Deprimida, limita el éxito de su implantación. Un componente estratégico del vigor es el número de tallos en la corona (n°t). El objetivo de este trabajo fue evaluar la variabilidad del n°t en plántulas de 11 poblaciones naturales de L. tenuis cultivadas en alta densidad en condiciones semicontroladas. Las semillas de las poblaciones se recolectaron en la provincia de Buenos Aires, se sembraron en macetas de plástico y se cultivaron en un solarium. Las plántulas de cada población (8 semanas después de la siembra) se retiraron y agruparon según su n°t. Se analizó variabilidad dentro y entre poblaciones para n°t por individuo. Además se determinaron:... Tipo: Info:eu-repo/semantics/article Palavras-chave: Lotus tenuis; Vigor de plántulas; Número de tallos; Variabilidad. Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200004 Registros recuperados: 415 Primeira ... 13 14 15 16 17 18 19 20 21 ... Última

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