1,720,965 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Karakterisasi Bakteri Penghasil Eksopolisakarida Asal Rhizosfer Tanaman Kentang sebagai Promotor Pertumbuhan Tanaman
No full textPemanfaatan Bakteri Exopolisakarida sebagai bahan perekat dan pengikat struktur tanah sehingga struktur tanah menjadi mantap. Bakteri EPS berperan dalam menstabilkan agregat tanah melalui teknik augmentasi pada rizosfer tanaman kentang. Penelitian ini bertujuan untuk mengkarakterisasi bakteri penghasil eksopolisakarida (EPS) yang diperoleh dari rizosfer tanaman kentang dataran tinggi yang difokuskan sebagai promotor pertumbuhan tanaman. Terdapat 3 lokasi pengambilan sampel yang dibedakan berdasarkan ketinggian muka air laut yaitu: 1200, 1500 dan 1800 m dpl di Malino, Sulawesi Selatan. Sampel tanah diencerkan dan dikultur pada media ATCC No. 14 dan media spesifik media Mac Concay bakteri penghasil eksopolisakarida. Setelah dilakukan pengujian terdapat 15 isolat bakteri EPS yang berpotensi menghasilkan eksopolisakarida dan semua bakteri tersebut dikelompokkan dalam bakteri gram negatif. Isolat P3T (63) menghasilkan nilai IAA ( Indole Acetic Acid) sebesar 21,14 ppm dan sebagai pelarut fosfat sebesar 20,59 ppm. Sedangkan Isolat P3T (50) memiliki kemampuan mengikat Nitrogen sebesar 1, 42 ppm, dan menghasilkan EPS sebesar 1,07 mg/mg protein dengan sumber karbon terbaik untuk memproduksi eksopolisakarida adalah SukrosaPemanfaatan Bakteri Exopolisakarida sebagai bahan perekat dan pengikat struktur tanah sehingga struktur tanah menjadi mantap. Bakteri EPS berperan dalam menstabilkan agregat tanah melalui teknik augmentasi pada rizosfer tanaman kentang. Penelitian ini bertujuan untuk mengkarakterisasi bakteri penghasil eksopolisakarida (EPS) yang diperoleh dari rizosfer tanaman kentang dataran tinggi yang difokuskan sebagai promotor pertumbuhan tanaman. Terdapat 3 lokasi pengambilan sampel yang dibedakan berdasarkan ketinggian muka air laut yaitu: 1200, 1500 dan 1800 m dpl di Malino, Sulawesi Selatan. Sampel tanah diencerkan dan dikultur pada media ATCC No. 14 dan media spesifik media Mac Concay bakteri penghasil eksopolisakarida. Setelah dilakukan pengujian terdapat 15 isolat bakteri EPS yang berpotensi menghasilkan eksopolisakarida dan semua bakteri tersebut dikelompokkan dalam bakteri gram negatif. Isolat P3T (63) menghasilkan nilai IAA ( Indole Acetic Acid) sebesar 21,14 ppm dan sebagai pelarut fosfat sebesar 20,59 ppm. Sedangkan Isolat P3T (50) memiliki kemampuan mengikat Nitrogen sebesar 1, 42 ppm, dan menghasilkan EPS sebesar 1,07 mg/mg protein dengan sumber karbon terbaik untuk memproduksi eksopolisakarida adalah Sukros
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
EVALUASI KESESUAIAN LAHAN TANAMAN KARET (Havea brasiliensis) di KECAMATAN TONDONG TALLASA KABUPATEN PANGKEP PROVINSI SULAWESI SELATAN
Full text linkProduksi pertanian yang tinggi dan berkelanjutan, hanya dapat dicapai dengan praktik pertanian yang didasarkan pada daya dukung lahan (carrying capacity) yang diindikasikan dengan kemampuan lahan dan kesesuaian lahan. Penelitian ini bertujuan untuk mengevaluasi kesesuaian lahan di Kecamatan Tondong Tallasa, Kabupaten Pangkep untuk pengembangan tanaman karet. Penelitian dilaksanakan dalam bentuk survey dengan memperbandingkan (matching) antara kualitas dan karakteristik lahan sebagai parameter dengan keriteria kelas kesesuaian lahan yang telah disusun berdasarkan persyaratan penggunaan atau persyaratan tumbuh tanaman karet. Penentuan kelas kesesuaian lahan dengan memperbandingkan dengan kriteria kesesuaian lahan berdasakan kriteria Badan Penelitian dan Pengembangan Pertanian Indonesia (2016), yang diadaptasi dari metode FAO (1976). Hasil analisis kesesuaian lahan disimpulkan bahwa kelas kesesuaian lahan aktual wilayah study S3wrs (sesuai marginal dengan faktor pembatas ketersediaan air, media perakaran, dan terrain). Dengan tingkat pengelolaan tinggi, maka kelas kesesuaian lahan potensial dapat menjadi S3rs (sesuai marginal dengan faktor pembatas media perakaran, dan terrain)
Isolation and Screening of Exopolysaccharide Producing Bacterial (EPS) from Potato Rhizosphere for Soil Aggregation
Full text linkExopolysaccharide (EPS) is a complex mix of macro-molecular electrolyte contained in the outer cells of bacteria excreted as mucus and has a role in soil aggregation. This study aims to obtain exopolysaccharide-producing isolates of potential origin of potatoes that can risosfer soil aggregates. Soil samples were collected from the rhizosphere of potato in three different land slope respectively 15%, 25% and 35% at altitudes \ud
1500 m above sea level in Malino, South Sulawesi. Soil samples were diluted to 10 \ud
-9 \ud
ATCC and cultured in media with the aim of selecting the bacteria that produce EPS-. There are 74 isolates of exopolysaccharide-producing bacteria were isolated and grouped into gram- negative bacteria. However, only 34 isolates formed a thick slime or mucus when cultured on media MacConkey. The results showed that 34 isolates of potential produces exopolysaccharide and 15 isolates produce exopolysaccharide best dry weight in the range of 0.10 to 2.24 mg / ml. Of the 15 isolates of EPS-producing ml) followed by P2.60 (1.96 mg / ml), P2.37 (1.79 mg / ml) and P2.57 (1.75 mg / ml)
PEMANFAATAN Aspergillus japonicus PADA BEBERAPA JENIS MEDIA PERBANYAKAN TERHADAP PERTUMBUHAN BIBIT TANAMAN KAKAO (Theobroma cacao L.)
No full textABSTRAK
One way to increase the growth of cacao seedlings with use fungi to stimulate plant growth that can grow on media containing organic matter that is able to meet its nutrients. Therefore, this study aimed to determine the effect of several types of Aspergillus japonicus propagation media in increasing the growth of cocoa plants. This research was conducted at the Screen House, Department of Plantation Cultivation, Pangkep State Agricultural Polytechnic Campus. The experimental method used a Randomized Block Design (RAK) with 4 treatments, namely no treatment (soil), Aspergillus japonicus propagation on rice media, Aspergillus japonicus propagation on corn media, and Aspergillus japonicus propagation on husk media. The results showed that the growth of A. japonicus on husk media had a significant effect on the stem diameter parameters and the highest stem height observation was given the husk media, which was 19.8 cm.
 
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