1,720,966 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
Screening of Soybean Varieties against Salinity stress at an Early Vegetative Growth Stage under Hydroponic Conditions
Full text linkSalinity is a principal environmental severe stress that significantly threatens crop production, including soybeans. It considerably affects various plant growth and physiological traits at different soybean growth stages, especially in coastal areas. However, the high soil pH in these regions presents a challenge. In this study, we screened two soybean varieties using an easy and rapid, and inexpensive screening technique. This study aimed to select soybean tolerance salinity stress in the early vegetative growth stage under hydroponic culture. The study was meticulously done with a randomized complete block design comprising two factors (varieties and NaCl) with three replications. Two soybean varieties, i.e., ‘Gepak Kuning and Dering 1’, were tested at three NaCl levels, i.e., 0, 60, and 120 mM. The results showed that each type of plant behaved differently to each stress level. The stress of 60 mM revealed that the Dering 1 variety was tolerant, whereas the Gepak Kuning variety was only somewhat tolerant. In conclusion, the Gepak Kuning variety was tolerant to 60 mM salinity stress, while the Dering 1 variety showed 60 mM and 120 mM salinity tolerance. These results will help select the most tolerant varieties to develop salinity-tolerant varieties in the future
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
Respon Temu Putih dan Temu Mangga dengan Pemberian BA dan 2,4-D secara In Vitro
No full textCalus and shoot induction of curcuma sp requires the balance amount of auxin and cytokinine which are suitable for the plant species. This study was aimed at evaluating the response of ‘temu putih’ (Curcuma zedoaria Rosc.) and ‘temu mangga’ (Curcuma mangga Val.) to the supplementation of 5 ppm BA and several levels of 2,4-D on the MS medium of in vitro culture. The study was conducted in the Laboratory of Agronomy, Department of Agriculture, Faculty of Agriculture, the University of Bengkulu, from December 2018 to February 2019. The plant material was explans isolated from the buds of curcuma tubers. The experiment was conducted in a completely randomized design arranged in factorial with 2 factors. The first factor was the kinds of curcuma i.e . C. zedoaria and C.mangga. The second factor was the concentration of 2,4–D i.e. 0 ppm, 1 ppm and 2 ppm. The base culture medium was MS with 5 ppm BA. The experimental unit consisted of three botle each of which containing of 1 explant. The treatment was repeated three times amounting to 54 experimental units. The results indicated that both curcuma had different growth respon to in vitro culture. Addition of 2,4-D to the MS medium containing 5 ppm BA produced cally. Callus induction was formed in in vitro culture of Curcuma zeodiaria suplemented with 1 ppm 2,4-D. Up to 2 ppm of 2,4-D, cally production of Curcuma mangga still increasing. Addition of 5 ppm of BA 5 to MS medium induced shoot formation in Curcuma zeodiaria but not in Curcuma mangga
PERTUMBUHAN DAN HASIL SELADA (Lactuca sativa L.) DENGAN PEMBERIAN PUPUK KANDANG DAN ABU SEKAM PADI DI INCEPTISOL.
Full text link[GROWTH AND LETTUCE YIELD (Lactuca sativa L.) BY GIVING MANURE AND RICE HUSK ASH IN INCEPTISOL]. Increasing market demand for lettuce (Lactuca sativa L.) makes the prospect of developing lettuce very promising. Bengkulu Province is dominated by inceptisol soil types which have low soil fertility, making it less optimal for lettuce growth. Giving organic matter can increase soil fertility through improving soil physical, chemical and biological properties so that it can support the growth of lettuce. This study aims to determine the dosage of manure, the dose of rice husk ash and the optimal dose interaction for lettuce growth and yield. This research was conducted from May 2018 to July 2018 in Medan Baru, Muara Bangkahulu Subdistrict, Bengkulu City. The research design used was a Completely Randomized Design (CRD) consisting of two factors and repeated 3 times. The first factor is the dosage of cow manure with three levels, namely: 0 tons/ha, 15 tons/ha, and 30 tons/ha. The second factor is the dose of rice husk ash which consists of three levels, namely 0 tons/ha, 3 tons/ha, and 6 tons/ha. Data from the observations were analyzed statistically by Analysis of Variance (ANOVA) using the F test at the level of 5%. To determine the dosage of manure, the dose of rice husk ash and the optimal combination of doses for growth and yield of lettuce used the Polynomial Orthogonal method. The results showed that there was no interaction between cow manure and rice husk ash on the growth and yield of lettuce. The effect of cow manure has not shown the optimum dose for growth and yield of lettuce. The addition of manure doses up to 30 tons/ha was able to increase the value of plant height, number of leaves, leaf area, and fresh weighted plant weight of 0.189, 0.038, 0.931 and 0.104 respectively. Giving rice husk ash up to a dose of 6 tons/ha did not have a significant effect on all observed variables.
PENGARUH FREKUENSI PENYIRAMAN TERHADAP PERTUMBUHAN LIDAH BUAYA (ALOE VERA CHINENSIS BAKER)
No full textPenelitian dilakukan untuk mencari frekuensi penyiraman yang paling optimum bagi pertumbuhan dan hasil lidah buaya. Percobaan polibag telah dilaksanakan dari bulan Juli 2012 sampai September 2012, yang merupakan percobaan polibag yang bertempat di rumah kaca jurusan BDP, Fakultas Pertanian Universitas Bengkulu. Bahan yang digunakan adalah bibit tanaman lidah buaya asal Pontianak, yang telah berumur 1 bulan. Lidah buaya ditanam dalam polibag brukuran 50 cm x 30 cm diisi media tanah dan pupuk kandang, dengan perbandingan tanah dan pupuk kandang yaitu 1:1, dan bobot kering angin media tanam 7 kg. Seminggu setelah tanam kemudian diberikan pupuk Urea sebanyak 30 gram/tanaman, KCL 20 gram/tanaman, dan SP-36 20 gram/tanaman. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) Satu faktor yaitu frekuensi penyiraman (P), yang terdiri dari empat perlakuan yaitu : P1= penyiraman setiap hari, P2= penyiraman 2 hari satu kali, P3= Penyiraman 3 hari satu kali, dan P4= penyiraman 4 hari satu kali sebanyak 1,5 liter/tanaman, percobaan diulang empat kali. Penyiraman dilakukan pada sore hari antara pukul 16:00-17:00 WIB sebanyak 1,5 liter/polibag. Tiap perlakuan terdiri dari 2 sampel, sehingga terdapat 32 tanaman. Hasil penelitian ini menunjukkan bahwa secara umum tidak nyata pengaruh frekunsi penyiraman tanaman terhadap pertumbuhan lidah buaya, dari semua variabel yang di amati hanya 1 variabel yang nyata yaitu pertambahan lebar daun lidah buaya (cm), yang tidak nyata yaitu pertumbuhan Jumlah Daun, Jumlah Anakan, Panjang Daun (cm), Tinggi Tanaman (cm), Ketebalan Pangkal Daun (mm), dan Bobot Basah Satu Helai Daun (gram). Dari hasil penelitian disimpulkan bahwa frekuensi penyiraman sebaiknya dilakukan 4 hari satu kali
PERAKITAN GALUR PADI GOGO TOLERAN KEKERINGAN DAN TAHAN BLAS BERDAYA HASIL TINGGI VARIETAS UNGGUL LOKAL BENGKULU MELALUI KULTUR ANTERA
No full textPenggunaan padi gogo varietas unggul saat ini masih sangat rendah,disebabkan karena kurangnya ketersediaan benih dan kurangnya minat penangkar dalam memproduksi benih padi yang unggul. Perakitan varietas memerlukan waktu dan dana yang relatif besar. Pembentukan galur homozigot dapat dipercepat dengan teknik kultur antera yang dapat menghasilkan galur-galur murni dalam satu generasi. Pembentukan tanaman haploid ganda spontan pada kultur antera padi sangat menguntungkan, karena tidak perlu menggandakan tanaman haploid sebagai bahan seleksi. Penelitian ini bertujuan untuk mendapatkan galur-galur haploid ganda padi gogo yang toleran terhadap cekaman kekeringan dan tahan penyakit blas. Bahan utama dalam penelitian ini adalah antera tanaman padi hasil persilangan (F1) yang terdiri atas varietas lokal dengan galur-galur terpilih yaitu P1 (Sriwijaya x IR-148+), P2 (Sriwijaya x IR-7858-1), P3 (Bugis x IR-148+), dan P4 (Bugis x IR-7858-1), media induksi kalus (N6), media regenerasi (MS) (mengikuti metode Dewi 2003, Herawati 2008). Kultur antera varietas lokal padi indica/indica menghasilkan respon induksi kalus dan regenerasi tanaman yang rendah, sehingga menghasilkan efisiensi kultur antera yang rendah dalam menghasilkan tanaman hijau. Perlu dilakukan inokulasi antera dalam beberapa tahap sehingga peluang untuk memperoleh planlet dalam jumlah yang cukup untuk bahan seleksi akan lebih besar. Sebagai alternatif dari penelitian ini telah dihasilkan tanaman F3 yang akan terus dieseleksi lebih lanjut hingga F6 hingga siap dievaluasi sesuai dengan tujuan yang ingin dicapai dari penelitian ini, yaitu menghasilkan galur-galur harapan yang toleran kekeringan dan tahan blas
EFEKTIVITAS NEMATISIDA DAUN JARAK PAGAR (Jatropha curcas L.) DALAM MENGHAMBAT SERANGAN NEMATODA PURU AKAR (Meloidogyne spp.) PADA TANAMAN TOMAT
Full text link[THE EFFECTIVENESS Jatropha curcas (L.) LEAF EXTRACTS IN INHIBIT ROOT-KNOT NEMATODE (Meloidogyne spp.) INJURIES ON TOMATO]. One of the main problems in tomato cultivation is the attack of root purse nematodes (Meloidogyne spp.). Some methods of controlling Meloidogyne spp. which can be done including using plants as vegetable nematicides. This study aims to get the concentration of Jatropha leaf extract which is effective in inhibiting the Meloidogyne spp attack on tomato plants. This study used 48 plants, 24 plants for observation 35 days after planting and 24 plants for observation until the age of 77 days after planting. This study used a Completely Randomized Design (CRD) with the treatment of Jatropha leaf extract concentrations (0%, 10%, 20%, 30%, 40%, 50%), and repeated four times. The results showed Jatropha curcas extract in inhibiting the attack of root purse nematodes (Meloidogyne spp.) can maintain plant height, fruit number, fruit weight, and plant stover wet weight 35 days after planting, but no significant effect on stover wet weight plants 77 days after planting and dry weight of plant stover 35 days after planting and 77 days after planting. The concentration of Jatropha leaf extract tends to increase the concentration, the smaller the rate of infection and the population of Meloidogyne spp on tomato plants. The concentration of Jatropha leaf extract 35% - 45% is the optimum concentration in inhibiting Meloidogyne spp. on tomato plants
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