1,720,966 research outputs found
Evaluación de la producción de leche en conejas de la raza Nueva Zelanda y uso de la lactancia controlada para disminuir la mortalidad en gazapos
Get PDF“La presente investigación se realizó en la Posta Zootécnica de la Facultad de Medicina Veterinaria y Zootecnia–BUAP, se utilizaron conejas de la raza nueva Zelanda y se midió la producción láctea bajo el régimen de lactación controlada. Después del nacimiento se pesaron los conejos durante 13 dias para medir ganancia de peso y producción de leche por coneja evaluando el crecimiento de los gazapos, el control de la mortalidad, el comportamiento de la coneja ante este tipo de manejo. Se trabajó con 4 grupos de 9 conejas de primer parto así como multíparas bajo este método de lactancia controlada y un grupo testigo de 9 conejas de primer parto y multíparas los cuales en este grupo testigo no se realizó el manejo de lactancia controlada. El cual se encontraron diferencias relevantes entre el control de la mortalidad y la producción de leche y crecimiento de la camada, el cual nos puede servir para el control de estos parámetros dentro de una explotación Cunícola.
Estudio de la transferencia de anticuerpos maternos contra el Circovirus Porcino Tipo 3 (PCV3) en las primeras semanas de vida de los lechones
No full text"Esta investigación se centra en el análisis de la transferencia de anticuerpos contra el Circovirus Porcino Tipo 3 (PCV3) de cerdas infectadas a sus lechones durante las primeras cuatro semanas de vida. El PCV3, identificado por primera vez en Estados Unidos en 2016, se ha relacionado con diversas manifestaciones clínicas como inflamación multisistémica, trastornos reproductivos y respiratorios, o incluso presencia en animales aparentemente sanos. El estudio se llevó a cabo en la posta zootécnica El Salado de la Facultad de Medicina Veterinaria y Zootecnia de la BUAP, donde se tomaron muestras de suero de cinco cerdas gestantes y sus respectivas camadas para evaluar los niveles de anticuerpos en el calostro y el suero de los lechones. Las muestras se procesaron en el Laboratorio de Inmunología del CIAD en Hermosillo, Sonora. Los resultados, analizados mediante ANOVA en el software Prism, mostraron que los lechones eran negativos a PCV3 al nacer, pero hubo una diferencia significativa en los niveles de anticuerpos entre la primera y la cuarta semana de vida. Este hallazgo confirma la transferencia pasiva de inmunidad mediante el calostro y su progresiva disminución en el tiempo"
Variación morfológica y enzimática en una población de abejas (Apis mellifera) en proceso de africanización.
No full textEl impacto causado por la abeja africanizada en su llegada a México ha motivado la realización de pocos trabajos de investigación para aprovechar las características útiles de esta especie. El presente estudio se realizó con el objetivo de conocer el grado de hibridación de una muestra de la población formada por 37 colmenas de abejas euroafricanas establecidas en Montecillo. Se utilizaron tres pruebas para estimar el grado de africanización en la población. La prueba de Rinderer agrupó a las colmenas en cuatro grupos: abejas africanizadas (48.65%); africanizadas con introgresión de genes europeos (18.92%); europeas con introgresión de genes africanizados (8.11%); y europea (24.32%). El análisis de componentes principales (CP) con base en caracteres morfológicos mostró en los CP1 y CP2, las seis variables relevantes siguientes: longitud de ala anterior (LAA), longitud de la abscisa proximal (LAxP), longitud de fémur (LFE), ancho de basitarso (ABA), longitud de tibia (LTI) y longitud de esternito (LEST). La distribución espacial de las colmenas permitió un agrupamiento similar al de la prueba de Rinderer. El análisis isoenzimático se aplicó en 41 colmenas, una población europea de Chihuahua (EUCH=600) y una africanizada procedente de Mérida (AFME=500). Se utilizaron las isoenzimas hexoquinasa, malato deshidrogenasa, enzima málica y en este análisis. Se encontraron loci no presentados en trabajos anteriores. La enzima relevante en el CP1 fue MDHA2A y en CP2 fue HEXA1A. Los resultados permiten inferir que las abejas africanizadas no han desplazado completamente a las abejas europeas y que el proceso de africanización alcanzado no ha tenido un impacto negativo en el apiario. _______________ MORPHOLOGIC AND GENETIC VARIATION IN A POPULATION OF HONEY BEES (Apis mellifera) ON THE PROCESS OF AFRICANIZATION. ABSTRACT: The impact caused by the Africanized honey bee at its arrival to México had not motivated enough research about this issue in order to take advantage of the useful attributes of this species. The objective of this study was to know the degree of hybridization in a sample of 37 beehives of Euroafricanized honey bees in Montecillo, México. In order to estimate the degree of hybridization of population, three procedures were used. First, the Rinderer test formed four groups of beehives: Africanized (48.65%); Africanized with introgression of European genes (18.92%); European with introgression of Africanized genes (8.11%); and European (24.32%). Second, the principal component analysis (CP) showed for CP1 and CP2 that length of the anterior wing (LAA), length of the proximal abscissa (LAxP), length of the femur (LFE), width of the basitarsus (ABA), length of tibia (LTI), and length of sternite (LEST) were the most important six traits for the racial classification of the bees. The spatial distribution of the two first components allowed to integrate four groups, like those ones formed with the Rinderer yest. Third, the isozyme analysis was carried out in 41 beehives, and in an European (EUCH=600) and Africanized (AFME=500) population using the isozymes hexokinase (HEXA), malate dehydrogenase (MDHA) and malic enzyme (ME). Results showed loci that have not been previously reported. The most important enzymes were MDHA2A and HEXA1A for CP1 and CP2, respectively. Results allowed us to infer that the Africanized honey bees have not completely displaced the European ones, and that the degree of africanization reached until now has not had a negative impact on the apiary.Tesis (Doctorado en Ciencias, especialista en Genética).- Colegio de Postgraduados, 2011.Consejo Nacional de Ciencia y Tecnología (CONACyT)
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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