1,720,969 research outputs found
Pemanfaatan Gen COI dan Cyt b untuk Taksonomi Molekuler : Sebuah Kasus di Anoa yang Terancam Punah (Bubalus spp.).
No full textAnoa adalah spesies endemik yang terancam punah di Sulawesi. Klasifikasi
anoa berdasarkan habitatnya, dibagi menjadi dua kelompok, anoa dataran rendah
dan anoa gunung. Namun, sebenarnya isu kontroversial anoa adalah pada status
taksonomi di kedua kelompok tersebut. Baru-baru ini, perbandingan genetik telah
mampu memberi pemahaman yang lebih baik tentang garis keturunan spesies
terkait, terutama pada determinasi spesies. Penelitian ini bertujuan untuk menguji
kemampuan gen COI dan cyt b untuk mengidentifikasi taksonomi antara anoa
gunung dan anoa dataran rendah, juga untuk mengidentifikasi variasi genetik dan
filogeni.
Total 681 pb gen COI dan 906 pb gen cyt b diperoleh dan digunakan untuk
memecahkan masalah taksonomi molekuler. Hasil penelitian menunjukkan bahwa
gen COI dan cyt b mampu dalam menetapkan status taksonomi anoa. Pada pohon
filogenetik, telah ditemukan bahwa kedua jenis anoa berada di clade yang terpisah.
Berdasarkan Kimura-2 Parameter (K2P), jarak genetik antara kedua jenis anoa
menunjukkan nilai yang lebih tinggi daripada ambang batas pemisah spesies
(2,5%). Oleh karena itu, kami mengusulkan bahwa nomenklatur binomial untuk
kedua jenis dataran rendah dan anoa gunung berturut-turut adalah Bubalus
depressicornis dan Bubalus quarlesi
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
Biogeographic history of the endangered dwarf buffalo, subgenus Anoa (Bovidae: Bubalus quarlesi and Bubalus depressicornis): a perspective based on mitochondrial DNA phylogeny
No full textThe Anoa, including the Mountain Anoa (Bubalus quarlesi) and the Lowland Anoa (Bubalus depressicornis) according to current taxonomy, are endangered bovid species endemic to the tropical island of Sulawesi. They are grouped in their own subgenus Anoa. The historical biogeography and phylogeny of this subgenus have not been well characterized. There are two hypotheses describing the colonization routes of large mammals in Southeast Asia: land-bridges and insular route. The present study aimed to understand the molecular phylogeny and test the historical colonization route of Anoa. A total of 71 mitochondrial DNA (cyt b gene and control region) sequence datasets from Anoa and other related species were analyzed. Molecular phylogeny reconstruction was done using a Bayesian inference model. Calibration points were used to estimate divergence time in Anoa based on a Bayesian phylogeny tree. Estimation of ancestral areas in Anoa ancestors using Reconstruct Ancestral State in Phylogenies was carried out to test the Anoa colonization route. The phylogenetic tree revealed the existence of two groups of Anoa, lowland and mountain Anoa, which diverged during the Middle Pleistocene 1.42 Mya (highest posterior density interval: 1.14–1.71 Mya). The Sundaland area is the most probable (P > 0.7) ancestral area for the Bubalus spp. in the Indonesian archipelago. The most probable Anoa colonization route appears to be through land-bridges, which geological records indicate formed between Sundaland and Sulawesi during the Pleistocene
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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