Reguladores de crecimiento y sustratos naturales para la aclimatación de vitro-plántulas de piña ananas comosus (l.) merr.

Con el propósito de obtener tecnologías para la etapa de adaptación de plántulas de piña, mediante el cultivo de tejidos, se experimentaron los sustratos arena amarilla de río, suelo natural y escoria de carbón, simultáneamente con las auxinas: AIA, AIB y ANA en concentraciones de 0,500, 1.000 y 1.500 ppm. Se registraron los parámetros vegetales número de raíces, longitud de la raíz y el peso seco de la raíz. En general ypara todo el ensayo, el sustrato arena amarilla de río fue el de mejor resultado, los otros dos manifestaron respuestas, generalmente, bajas y sin una tendencia clara. La hormona que mejor desempeño tuvo, cuando se combinó con el sustrato arena amarilla de río, fue la AIB, en concentraciones de 1000 y 1500 ppm.The aclimatizacion stage is the critical step during the development of tissue cultures in crops. It was evaluated the response of vitro-plants from pineapple Ananas comosus (L.) Merr., to the applications of the hormones: AlA, AIB and ANA in dos es 0-500-1000 and 1500 ppm at the medium: yellow river sand, natural soil and charcoal-scoria. The number of roots, root length and dry weigh root were recorded in the vitro-plants. In general, the yellow river sand was the medium that showed the best results. The natural soil and the charcoal - scoria had low response without a clear tendency. The AIB hormone presented a very good behaviour with the combination yellow river sand at 1000 and 1500 ppm dose

Determinación de las características morfofisiológicas asociadas con el rendimiento en 15 líneas de cebada (hordeum vulgare l.)

Los estudios fisiológicos indican que una alta producción de grana en cebada se alcanza cuando se tienen una debida interacción de variedad, ambiente y manejo agronómico. Convencionalmente, en los programas de mejoramiento de este cereal en Colombia, se han obtenido variedades mejoradas que superan cada vez más los rendimientos de grana por hectárea

Models to estimate the bunch dry weight in african oil palm (elaeis guineensis jacq.), american oil palm (elaeis oleifera h.b.k. cortes) and the interspecific hybrid (e. oleifera x e. guineensis)

Statistical models were used to estimate the bunch dry weight through indirect nondestructive methods in African oil palm (Elaeis guineensis) American oil palm (Elaeis oleifera) and the interspecific hybrid (E. oleifera x E. guineensis); and compared with the formula proposed by Corley. The studies were conducted at Santa Barbara and Chaparral-Cuernavaca on the Unipalma plantation, located in the eastern palm region of Colombia. Ten palms were selected for each group and 30 bunches were sampled for six months. Polynomial and exponential statistical models were postulated, with the best being linear without intercept. The results confirm and validate the usefulness of the model formulated to estimate the bunch dry weight of African oil palm (E. guineensis), American oil palm (E. oleifera) and the interspecific hybrid (OxG); however, it proved more convenient to use the models proposed in this study because they are tailored to the specific environmental conditions of the eastern palm region of Colombia

La plasticidad fenotípica de frijol arbustivo determinado Phaseolus vulgaris L.

Un aspecto importante en el rendimiento de las plantas es el relacionado con el producto de la interacción entre el genotipo y el ambiente, el cual se manifiesta a través de procesos fisiológicos. Es decir, que el rendimiento es la expresión fenotípica de interés antropocéntrico (Kohashi-Dhibata,<br />1979). En el caso de frijol, el rendimiento está determinado,<br />entre otros factores por el índice de área foliar (IAF), la duración del área foliar (AF) y la retención de flores, factores que permiten la mayor formación de vainas y el tamaño de las mismas; del último componente depende el número de granos.<br />(Westerman y Crothers, 1979; Chaparro y Moreno, 1982)

Reguladores de crecimiento y sustratos naturales para la aclimatación de vitro-plántulas de piña Ananas comosus (L.) Merr. Growth regulators and natural mediums for aclimatation of pineapple vitro-plants Ananas comosus (L.) Merr

Con el propósito de obtener tecnologías para la etapa de adaptación de plántulas de piña, mediante el cultivo de tejidos, se experimentaron los sustratos arena amarilla de río, suelo natural y escoria de carbón, simultáneamente con las auxinas: AIA, AIB y ANA en concentraciones de 0,500, 1.000 y 1.500 ppm. Se registraron los parámetros vegetales número de raíces, longitud de la raíz y el peso seco de la raíz. En general y&lt;br /&gt;para todo el ensayo, el sustrato arena amarilla de río fue el de mejor resultado, los otros dos manifestaron respuestas, generalmente, bajas y sin una tendencia clara. La hormona que mejor desempeño tuvo, cuando se combinó con el sustrato arena amarilla de río, fue la AIB, en concentraciones de 1000 y 1500 ppm.<br>&lt;p&gt;The aclimatizacion stage is the critical step during the development of tissue cultures in crops. It was evaluated the response of vitro-plants from pineapple Ananas comosus (L.) Merr., to the applications of the hormones: AlA, AIB and ANA in dos es 0-500-1000 and 1500 ppm at the medium: yellow river sand, natural soil and charcoal-scoria. The number of roots, root length and dry weigh root were recorded in the vitro-plants. In general, the yellow river sand was the medium that showed the best results. The natural soil and the charcoal - scoria had low response without a clear tendency. The AIB hormone presented a very good behaviour with the combination yellow river sand at 1000 and 1500 ppm dose.&lt;/p&gt

Models to estimate the bunch dry weight in African oil palm (Elaeis guineensis Jacq.), American oil palm (Elaeis oleifera H.B.K. Cortes) and the interspecific hybrid (E. oleifera x E. guineensis)

&lt;p class="MsoNormal" style="text-align: justify; line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;"&gt;&lt;span style="font-family: " lang="EN-US"&gt;Statistical models were used to estimate the bunch dry weight through indirect nondestructive methods in African oil palm (&lt;em&gt;Elaeis guineensis&lt;/em&gt;) American oil palm (&lt;em&gt;Elaeis oleifera&lt;/em&gt;) and the interspecific hybrid (&lt;em&gt;E. oleifera x E. guineensis&lt;/em&gt;); and compared with the formula proposed by Corley. The studies were conducted at Santa Barbara and Chaparral-Cuernavaca on the Unipalma plantation, located in the eastern palm region of Colombia. Ten palms were selected for each group and 30 bunches were sampled for six months. Polynomial and exponential statistical models were postulated, with the best being linear without intercept. The results confirm and validate the usefulness of the model formulated to estimate the bunch dry weight of African oil palm (&lt;em&gt;E. guineensis&lt;/em&gt;), American oil palm (&lt;em&gt;E. oleifera&lt;/em&gt;) and the interspecific hybrid (OxG); however, it proved more convenient to use the models proposed in this study because they are tailored to the specific environmental conditions of the eastern palm region of Colombia.&lt;/span&gt;&lt;/p&gt

Análisis de crecimiento de cuatro materiales de lechuga (Lactuca sativa) Growth analysis of four lettuce varieties (Lactuca sativa)

Para estudiar los índices de crecimiento Tasa relativa de crecimiento (TRC), Tasa de asimilación neta (TAN), relación área/peso (RAF), índice de área foliar (IAF) y Tasa de crecimiento de cultivo (TCC) en plantas de lechuga, procedentes de semilla producida en condiciones de invernadero en la Sabana de Bogotá y de semilla importada, de las variedades Great Lakes 118 y Clímax, se realizó un trabajo de campo en el Centro de  Investigaciones Agropecuarias de Tibaitata (Cundinamarca) durante el segundo semestre del año 1991.&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;Growth indices: Relative Growth Rate (RGR), Net Assimilation Rate (NAR), Areaweight Relation (LAR), Leaf Area Index (LAI) and Crop Growth Rate (CGR) were studied using locally produced and imported seed of Great Lakes 118 and Climax. Field work took place at Tibaitata Research Center during the second semester of 1991

Análisis de crecimiento de cuatro materiales de lechuga (lactuca sativa)

Para estudiar los índices de crecimiento Tasa relativa de crecimiento (TRC), Tasa de asimilación neta (TAN), relación área/peso (RAF), índice de área foliar (IAF) y Tasa de crecimiento de cultivo (TCC) en plantas de lechuga, procedentes de semilla producida en condiciones de invernadero en la Sabana de Bogotá y de semilla importada, de las variedades Great Lakes 118 y Clímax, se realizó un trabajo de campo en el Centro de  Investigaciones Agropecuarias de Tibaitata (Cundinamarca) durante el segundo semestre del año 1991.Growth indices: Relative Growth Rate (RGR), Net Assimilation Rate (NAR), Areaweight Relation (LAR), Leaf Area Index (LAI) and Crop Growth Rate (CGR) were studied using locally produced and imported seed of Great Lakes 118 and Climax. Field work took place at Tibaitata Research Center during the second semester of 1991

Desarrollo de cultivares de papa resistentes a heladas mediante cruzamientos y fusiones con especies resistentes

IP 1101-07-250-9

International Nosocomial Infection Control Consortiu (INICC) report, data summary of 43 countries for 2007-2012. Device-associated module

We report the results of an International Nosocomial Infection Control Consortium (INICC) surveillance study from January 2007-December 2012 in 503 intensive care units (ICUs) in Latin America, Asia, Africa, and Europe. During the 6-year study using the Centers for Disease Control and Prevention's (CDC) U.S. National Healthcare Safety Network (NHSN) definitions for device-associated health care–associated infection (DA-HAI), we collected prospective data from 605,310 patients hospitalized in the INICC's ICUs for an aggregate of 3,338,396 days. Although device utilization in the INICC's ICUs was similar to that reported from ICUs in the U.S. in the CDC's NHSN, rates of device-associated nosocomial infection were higher in the ICUs of the INICC hospitals: the pooled rate of central line–associated bloodstream infection in the INICC's ICUs, 4.9 per 1,000 central line days, is nearly 5-fold higher than the 0.9 per 1,000 central line days reported from comparable U.S. ICUs. The overall rate of ventilator-associated pneumonia was also higher (16.8 vs 1.1 per 1,000 ventilator days) as was the rate of catheter-associated urinary tract infection (5.5 vs 1.3 per 1,000 catheter days). Frequencies of resistance of Pseudomonas isolates to amikacin (42.8% vs 10%) and imipenem (42.4% vs 26.1%) and Klebsiella pneumoniae isolates to ceftazidime (71.2% vs 28.8%) and imipenem (19.6% vs 12.8%) were also higher in the INICC's ICUs compared with the ICUs of the CDC's NHSN