1,720,960 research outputs found
The heterogeneity of Caatinga biome: an overview of the bat fauna
No full textde Carvalho-Neto, Francisco Geraldo, da Silva, Jackson Roberto, Santos, Neide, Rohde, Cláudia, Garcia, Ana Cristina Lauer, Montes, Martín Alejandro (2017): The heterogeneity of Caatinga biome: an overview of the bat fauna. Mammalia (Warsaw, Poland) 81 (3): 257-264, DOI: 10.1515/mammalia-2015-0046, URL: http://dx.doi.org/10.1515/mammalia-2015-004
Figure 3 in The heterogeneity of Caatinga biome: an overview of the bat fauna
No full textFigure 3: Cluster analyses based on the Euclidean distance for the bat species composition in the eight Caatinga ecoregions (A) and for the main references in the best surveyed ecore- gions for the bat fauna. (B) * Fazenda Arara/Caatinga Arbustiva ** Reserva Particular do Patrimônio Natural – Fazenda Bituri/ Floresta Montana. Chapada Diamantina Complex (CDC), São Francisco Dunes (SFD), Raso da Catarina (RAC), Campo Maior Complex (CMC), Borborema Highlands (BOH), Southern Sertaneja Depression (SSD), Ibiapaba-Araripe Complex (IAC), and Northern Sertaneja Depression (NSD).Published as part of de Carvalho-Neto, Francisco Geraldo, da Silva, Jackson Roberto, Santos, Neide, Rohde, Cláudia, Garcia, Ana Cristina Lauer & Montes, Martín Alejandro, 2017, The heterogeneity of Caatinga biome: an overview of the bat fauna, pp. 257-264 in Mammalia (Warsaw, Poland) 81 (3) on page 261, DOI: 10.1515/mammalia-2015-0046, http://zenodo.org/record/783761
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
Ecologia, assimetria flutuante e dimorfismo sexual em pequenos mamíferos em remanescentes de floresta atlântica do nordeste do Brasil
No full textDentre a grande diversidade de ecossistemas brasileiros está a Floresta Atlântica. Este é um dos biomas com maior riqueza de espécies, dentre as quais estão os pequenos mamíferos como os marsupiais, os morcegos e os roedores. Atualmente, a Floresta Atlântica é um dos biomas mais ameaçados pela intensa destruição de suas florestas, sendo a situação mais grave na sub-região de Pernambuco. As pesquisas ecológicas com pequenos mamíferos são escassas nesta sub-região. Tendo em vista este cenário, o presente trabalho estudou a riqueza e a abundância destes organismos em três remanescentes de Floresta Atlântica na sub-região de Pernambuco: a Estação Ecológica de Tapacurá (Tapacurá) e de Caetés (Caetés) e o Refúgio Ecológico Charles Darwin (Darwin). As amostragens ocorreram em 2012, com o esforço de 15 dias de coleta na estação chuvosa e 15 na estação seca para cada área de estudo. Foram coletados 566 espécimes de 28 espécies, sendo 18 de morcegos, seis de roedores e quatro de marsupiais. Os morcegos foram mais abundantes (n=543), seguido pelos marsupiais (n=12) e roedores (n=11). Darwin apresentou a maior abundância e riqueza de espécies. Os índices de heterogeneidade de Shannon-Wiener, diversidade de Simpson e equitabilidade de Pielou, levando em consideração todas as amostragens, foram de 1,829 nats.indivíduo, 0,718 e 0,549, respectivamente. Os menores valores para os índices de Simpson e de Shannon-Wiener ocorreram em Caetés. Pelo teste de qui-quadrado houve maior abundância de A. planirostris (X2=49,15; p<0,0001) e C. perspicillata (X2=28,113; p<0,0001) na estação seca. Os agrupamentos por Jaccard e Morisita revelaram maior similaridade entre Darwin e Caetés. Em Caetés houve o registro inédito de duas espécies de roedores e uma de marsupial e em Darwin de quatro espécies de marsupiais. Os ambientes mais antropizados (Caetés) e com pouco tempo de recuperação florestal (Tapacurá) foram os que apresentaram a menor diversidade de pequenos mamíferos.CAPE
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
Isolation and cloning of the gene that encodes the lipase of the fungus endomelanconiopsis endophytica
No full textScientific discoveries and technological advances in the field of molecular biology of
proteins, especially in the late 19th and early 20th century, contributed to the
employment of biocatalysts by industries. This way, enzymes started to occupy an
important role in economically profitable activities. Lipases are among the hydrolytic
enzymes of great interest, because they are versatile biocatalysts, capable to
catalyze various reactions, both in aqueous and organic medium with water content
restricted. Although lipase are widely distributed, it can be said that these enzymes
are the most studied and exploited for its expression and production by fungi. In
microorganisms, lipases are able to show phospholipid activity, being used as a
defense mechanism, since when secreted, they provide competition with the
microflora; facilitate the digestion of lipids and fatty acids released assist in tissue
adhesion, cell-cell and cell-host. In this work, we isolated the lipase gene of the
fungus Endomelanconiopsis endophytica through several molecular biology tools,
such as the extraction of mRNA and synthesis of double stranded cDNA.As descobertas científicas e os avanços tecnológicos no campo da biologia
molecular de proteínas, principalmente no final do século XIX e início do século XX,
contribuíram para o emprego de biocatalizadores pelas indústrias. Assim as enzimas
passaram a ocupar um papel importante em atividades economicamente lucrativas.
As lipases estão entre as enzimas hidrolíticas de grande interesse, são
biocatalisadores versáteis, capazes de catalisar diferentes reações, tanto em meio
aquoso como em meio orgânico com teor de água restrito. Apesar das lipases
estarem amplamente distribuídas, pode-se dizer que estas enzimas são mais
estudadas e exploradas quanto a sua expressão e produção por fungos. Nos
microrganismos, as lipases podem apresentar atividade fosfolipídica, sendo
utilizadas como mecanismo de defesa, visto que quando secretadas, proporcionam
competição com a microflora; facilitam a digestão dos lipídeos e os ácidos graxos
livres liberados auxiliam na adesão tecidual célula-célula e célula-hospedeiro. Neste
trabalho isolamos o gene da lipase do fungo Endomelanconiopsis endophytica
através de diversas ferramentas de biologia molecular, como a extração do mRNA e
síntese de cDNA dupla fita
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
- …
