ISSN: 2310-2799
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546,196 artículos
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Año:
2020
ISSN:
1852-6098
Golbach, R.
Fundación Miguel Lillo
Resumen
Cerophytum fuscicorne Bonv. is cited for the first time for Bolivia, and C. distinguendum Soarez & Peracchi for Paraguay, C. boliviense from Bolivia, C.minutum from Argentina, and C. trinidadense from Trinidad, are described as new species.
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Año:
2020
ISSN:
1852-6098
Alabarce, Estela
Fundación Miguel Lillo
Resumen
An eventual case of parasitism, Embernagra platensis and Poospiza melanoleuca (Aves, Emberizidae)
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Año:
2020
ISSN:
1852-6098
Terán, Enrique
Fundación Miguel Lillo
Resumen
Obituary note on Dr. Konstantin Gavrilov (1908-1982).
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Año:
2020
ISSN:
1852-6098
Hasselrot de Gómez, Teresa A.
Fundación Miguel Lillo
Resumen
Fifty samples of soil taken in bean fields from eighteen circunscriptions of the Tucuman province (Argentina) were analized in order to recognize the species of nematodes present in the crop.
The following genera were found: Meloidogyne; Heterodera; Pratylenchus; Helicotylenchus; Hoplolaimus; Paratylenchus; Tylenchorhynchus; Criconemoides; Xiphinema and Trichodorus.
The root-knot nematodes: Meloidogyne (M. javanica; M. incognita; M. arenaria y M. decalineata) are one of the most serious problems for bean production in northwestern Argentina. Damage, importance and dispersion are mentioned.
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Año:
2020
ISSN:
1852-6098
Nuñez, Josué A.
Fundación Miguel Lillo
Resumen
Presents studies on the collecting behavior of domestic bees at the Ecosystem level.
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Año:
2020
ISSN:
2007-9621, 0188-6266
Tosquy Valle, Oscar Hugo; López Salinas, Ernesto; Esqueda Esquivel, Valentín Alberto; Rodríguez Rodríguez, José Raúl; Acosta Gallegos, Jorge Alberto
Universidad de Guanajuato
Resumen
In the state of Veracruz, the average bean yield is less than 700 kg ha-1, due to the use of low yielding materials that are susceptible to drought and diseases. Improved varieties could help to reverse this situation. For this reason, from 2011 to 2013 the Negro Comapa bean variety was validated in 11 environments in Veracruz, Mexico, in order to verify its productivity and determine its yield stability in comercial plots from 1500 m2 and 2000 m2. In eight environments, plots were conducted in conditions of residual moisture and, in three, under rainfall conditions. To determine the grain yield, in each genotype four samples of 6 m2 each were made. Under residual moisture, Negro Comapa outyielded Negro Jamapa and Negro Michigan by 22% and 39%, respectively, and by 43% and 45% under rainfed conditions. Its average yield was 1261 kg ha-1, significantly higher than the two check varieties. Negro Comapa showed high productivity, disease resistance and high yield response in favorable environments.
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Año:
2020
ISSN:
2007-9621, 0188-6266
Manzanares Rivera, José Luis
Universidad de Guanajuato
Resumen
The occurrence of chronic kidney disease is studied for the population in the state of Sonora, throughan environmental causal features approach during the period 1998-2015. The study relies on an exploratory data analysis for two data structures: time series and cross section data.This methodology is applied to hospital admissions and mortality data for a time period covering the last decade. Results suggest the presence of socio environmental determents consistent with the Mesoamerican nephropathy hypotheses and allow to identify an area of opportunity for policy makers to design preventive control measures.
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Año:
2020
ISSN:
2007-9621, 0188-6266
Peinado Camacho, José de Jesús; Montoy Hernández, Luis Daniel; Torres Hernández, Zacarías
Universidad de Guanajuato
Resumen
Cuando las políticas públicas son de austeridad, los recursos económicos disminuyen y las oportunidades son escasas. En condiciones como esta es momento de pensar, sugerir y aplicar nuevas alternativas para superar situaciones adversas. En este contexto, el objetivo de la investigación es proponer una estrategia para la generación de recursos económicos a través de pruebas de laboratorios acreditados para el Centro de Investigación e Innovación Tecnológica (Ciitec). El diseño de la investigación es no experimental. El tipo de estudio es descriptivo, y como técnica de investigación se utilizó el estudio de caso. La presente investigación aportó información útil sobre las pruebas de laboratorios acreditados, por lo que se puede tener una administración eficiente a fin de elevar los ingresos monetarios. Entre los resultados relevantes se encontró que el Ciitec tiene infraestructura de servicios, capacidad instalada, capital intelectual y gestión del conocimiento; por esta razón, tiene mayores ventajas y mejores elementos para generar recursos.
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Año:
2020
ISSN:
2007-9621, 0188-6266
Indoor radon (222Rn) in a public workplace of Aldama, Chihuahua, Mexico and level of worker exposure
Salinas-Ramírez, Hilse Ximena; Rubio-Arias, Héctor Osbaldo; Colmenero-Sujo, Luis Humberto; Luévano-Gurrola, Sergio Dionisio; Ochoa-Rivero, Jesús Manuel
Universidad de Guanajuato
Resumen
The inhalation of radon gas (222Rn) induces lung cancer in humans. The objective of this research was to quantify the 222Rn levels in a public office. The study was carried out in two stages; in the first stage (FS), the 222Rn was determined at three high levels (0.74 m, 1.33 m and 2.06 m) away from the main door, while in the second stage (SS) it was determined at the center of the office. The concentration was obtained with a portable AlphaGuard device, Professional Radon Monitor. An ANOVA analysis was performed for each step (α = 0.05), considering a factorial arrangement design 3×2. For both FS and SS were detected statistical differences for the height factor (p < 0.05) and time factor (p < 0.05), but not for the interaction (p > 0.05). The 222Rn concentration was greatest at the height of 0.74 m (161.31 Bq m-3 in FS and 168.21 Bq m-3 in SS) which is higher than that of the international standards of the World Health Organization (WHO) of 100 Bq m-3 and higher than the standards of the United States of America (USA) of 148 Bq m-3.
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