1,720,969 research outputs found
Growth and reproduction of Chelonoidis chilensis (Reptilia, Testudinidae) in captivity
Get PDFChelonoidis chilensis is an endemic Argentine tortoise. It is considered by the IUCN (International Union for the Conservation of Nature) to be a vulnerable species, being the most traded native reptile in the illegal pet market. At present, little is known about the reproductive biology of this chelonian, therefore the aim of this paper is to contribute to the knowledge on reproduction and growth in captivity of C. chilensis. We used adult tortoise of both sexes, separated into two reproductive enclosures, and their growth was recorded monthly over a period of 12 months. The collected eggs were artificially incubated under controlled conditions of temperature and humidity. The period of copulation occurred between November and January and the nesting season was observed between January and April. The incubation period was 9 months with a hatching success of 8.7%; and the percentage of adult mortality was 23.5%. No significant differences in growth between sexes were found, this being a possible strategy of the species to reduce energy costs associated with metabolic maintenance after the reproductive stage.Fil: Romito, María Laurq. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Parachu Marco, Maria Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Imhof, Alba. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; Argentin
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
Sex differences in the genitalia of hatchlings Caiman latirostris (Daudin, 1801)
No full textTo date the discrimination of newly hatched caiman into malesand females has not been possible by observing the externalgenitalia. We show that such separation can be achieved fromsimple measures that can be recorded on the cliteropenis. Thephotographic measurement technique detailed herein was alsotried on live hatchlings, which decreases stress on the hatchlingscompared to measuring with digital calipersFil: Nuñez Otaño, Noelia Betiana. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina. Proyecto Yacaré; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Imhof, Alba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Proyecto Yacaré; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Bolcatto, Pablo Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Larriera, Alejandro. Proyecto Yacaré; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; Argentin
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
Cytogenetic studies on the painted turtle (Trachemys dorbigni: Testudinata, Emydidae)
Get PDFEl objetivo de este trabajo fue caracterizar la estructura cromosómica de Trachemys dorbigni (Testudinata, Emydidae) aportando información a los escasos antecedentes citogenéticos reportados. Se analizaron 14 ejemplares alojados en instalaciones de la Estación Zoológica Experimental Granja La Esmeralda de la ciudad de Santa Fe provenientes de diferentes decomisos, por lo que sus lugares de origen no pudieron ser establecidos. Las preparaciones se obtuvieron a partir de cultivo de sangre entera y el análisis de metafases se realizó mediante tinción convencional Giemsa y tinciones diferenciales C y NOR. Los resultados determinaron un número cromosómico diploide de 2n=50, y los cromosomas se clasificaron según su morfología en 6 pares de metacéntricos/submetacéntricos, 10 pares de acrocéntricos/telocéntricos y 9 pares de microcromosomas; dicha clasificación fue corroborada mediante promedio de relación de brazos e índice centromérico. No se observaron diferencias morfológicas entre cariotipos de machos y hembras, mientras que los bandeos C revelaron heterocromatina en posición telomérica y en bloque y los bandeos NOR determinaron una región organizadora nucleolar en el par 13, en posición terminal en ambos telómeros. Este trabajo permite ampliar los escasos antecedentes citogenéticos en esta especie, debiéndose profundizar el estudio mediante bandeo con fluorescencia para corroborar o complementar los resultados obtenidos.The aim of the present study was to characterize the karyotypic structure of Trachemys dorbigni (Testudinata, Emydidae) contributing information to the scarce cytogenetic data reported. Fourteen specimens housed on the premises of the Estación Zoológica Experimental “Granja La Esmeralda” of Santa Fe City were analyzed. The exact place of origin could not be determined since they came from various confiscations. Preparations were obtained from whole blood culture. The analysis of metaphases was performed by conventional Giemsa staining and differential banding. The results showed a diploid chromosome number of 2n=50. Chromosomes were classified according to their morphology in 6 pairs of metacentric/submetacentric, 10 pairs of acrocentric / telocentric and 9 pairs of microchromosomes; this classification was corroborated by average arm ratio and centromeric index. No morphological differences were observed between the karyotypes of males and females, whereas C banding showed heterochromatin telomeric position, and NOR staining determined a nucleolar organizer region in pair 13, in both telomeres in terminal position. This work allows broadening the limited cytogenetic background regarding this species, being necessary further studies using fluorescence banding to corroborate or supplement our results.Fil: Salas, Anabel. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales; ArgentinaFil: Imhof, Alba. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Cs.naturales. Laboratorio de Zoología Aplicada: Anexo Vertebrados (fhuc-unl/maspyma); ArgentinaFil: Amavet, Patricia Susana. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentin
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