1,721,006 research outputs found
INTRASPECIFIC VARIATION IN THE REPRODUCTIVE EFFORT AMONG THREE POPULATIONS OF AN INTERTIDAL GASTROPOD, Nerita japonica (Dunker)
No full textThe aim of the present research is to figure out the reproductive effort of Nerita japonica occurring in three different intertidal habitats of Amakusa Shimoshima Island, western Kyushu, Japan. Rocky shore population and other two stony shore populations (the upper stony shore and the lower stony shore) were described based on: (a) its mean mature gonad dry weight, (b) reproductive effort, and (c) the relationship between reproductive effort and body size. Data recorded in the period of spawning season. The results revealed that there were mean mature gonad dry weight and reproductive effort variations among three snail populations. Mean mature gonad dry weight and reproductive effort were larger for the Rocky shore population, intermediate for lower stone shore population, and smaller for the upper stone shore population. In one out of three populations, i.e., the upper stone shore population, reproductive effort of mature females increased significantly with an increase in body size. The data showed that reproductive effort is related to adult body size of N. japonica. There was an intraspecific variation in reproductive effort among three populations of N. japonica over even small geographic distances. Keywords: mature body size, mature gonad dry weight, reproductive effort, intraspecific variation, Nerita japonica. Â Variasi Indeks Kematangan Gonad Interspesies pada Tiga Populasi Gastropoda Intertidal, Nerita japonica (Dunder)) Penelitian ini bertujuan untuk mendeskripsikan indeks kematangan gonad dari gastropoda intertidal, Nerita japonica yang hidup di tiga habitat yang berbeda di Pulau Shimoshima Amakusa, Kyushu bagian barat, Jepang. Parameter yang diamati pada setiap populasi adalah: (a) nilai rata-rata berat kering gonad matang, (b) indeks kematangan gonad, dan (c) hubungan antara indeks kematangan gonad dan ukuran tubuh. Data dicatat pada periode musim pemijahan. Ketiga populasi memperlihatkan nilai rata-rata berat kering gonad yang matang dan indeks kematangan gonad yang berbeda. Populasi pantai berbatu memiliki nilai rata-rata berat kering matang gonad dan indeks kematangan gonad yang paling besar, diikuti oleh nilai dari populasi pantai berbatu bagian bawah dan populasi pantai berbatu bagian atas memiliki nilai yang paling kecil. Selanjutnya, satu dari tiga populasi, yaitu populasi pantai berbatu bagian atas memperlihatkan indeks kematangan gonad dari individu-individu betina N. japonica berhubungan dengan ukuran tubuhnya. Sekalipun indeks kematangan gonad dari individu-individu N. japonica meningkat secara signifikan dengan bertambahnya ukuran tubuh, namun terdapat variasi intraspesifik pada N. japonica dalam hal indeks kematangan gonad menurut habitat walaupun secara geografis berdekatan.Kata kunci: ukuran tubuh matang kelamin, berat kering gonad matang, indeks kematangan gonad, variasi intraspesifik, Nerita japonica
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
Variasi Intraspesifik dalam Kecepatan Tumbuh di antara Tiga Populasi Gastropoda Intertidal, Nerita japonica (Dunker)
Get PDFUntuk mengetahui kecepatan tumbuh Nerita japonica, maka diadakan penelitian pada populasi-
populasi yang hidup pada tiga macam habitat yang berbeda di Pulau Shimoshima Amakusa,
Kyushu bagian barat, Jepang. Parameter yang diamati adalah kecepatan tumbuh rata-rata,
pola kecepatan tumbuh rata-rata musiman, dan hubungan antara kecepatan tumbuh dan
ukuran tubuh diantara tiga populasi. Pengamatan dilakukan dalam waktu dua bulan selama
satu tahun sehingga dapat diketahui variasi menurut musim. Ketiga populasi memperlihatkan
kecepatan tumbuh yang berbeda. Populasi pantai rocky tumbuh paling pesat dan populasi
pantai stony bagian atas paling lambat. Pola kecepatan tumbuh ketiga populasi, bervariasi
menurut musim. Populasi pantai rocky memiliki kecepatan tumbuh maksimal pada periode
pertumbuhan Meiï€Juli, sedangkan dua populasi pantai stony pada Juliï€September. Pada bulan
November−Maret tahun berikutnya ketiga populasi tumbuh sangat lambat. Kecepatan tumbuh
ketiga populasi berkurang secara signifikan seiring bertambahnya ukuran tubuh, kecuali pada
November−Maret tahun berikutnya, satu dari tiga populasi tidak memperlihatkan hubungan
antara kecepatan tumbuh dan ukuran tubuh. Dapat disimpulkan terdapat variasi intraspesifik
pada N. japonica dalam hal kecepatan tumbuh menurut musim dan habitat walaupun dengan
jarak geografi yang pendek
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
MORFOLOGI NEMATOSIT DARI DUA SPESIES KARANG SCLERACTINIA (Seriatopora hystrix dan Seriatopora caliendrum)
Get PDFTujuan penelitian ini adalah membandingkan dimensi nematosit, yaitu panjang dan lebar kapsul serta panjang tangkai) antara kedua karang Scleractinia, S. hystrix dan S. caliendrum yang dikumpulkan dari terumbu karang pantai Malalayang Kota Manado. Pengamatan nematosit dilakukan dengan menggunakan Mikroskop tipe Olympus CX41, sedangkang pengukuran dimensi nematosit digunakan jangka sorong stainless steel (manual) dalam satuan mm, kemudian dikonversi kedalam μm. S. hystrix dan S. caliendrum, masing-masing memiliki tipe nematosit yang sama, yaitu microbasic p-mastigophore (MpM) dan holotrichous isorhiza (HI). Panjang dan lebar kapsul, serta panjang tangkai nematosit dari kedua spesies melalui analisis statistik (uji-t) memperlihatkan hasil tidak berbeda nyata (P > 0.05). Penelitian ini menyatakan bahwa tipe dan morfologi nematosit dari kedua spesies uji adalah sama dan menyarankan bahwa S. hystrix dan S. caliendrum adalah spesies yang sama. Bagaimanapun perlu dilakukan uji lanjut tentang habitat dan lingkungannya dimana fauna-fauna ini berada dan uji DNA apakah perbedaan atau persamaan dari kedua spesies merupakan faktor lingkungan atau genetika atau gabungan dari kedua faktor tersebut.Kata kunci: Seriatopora hystrix; Seriatopora caliendrum, nematosit, MpM, H
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