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HAYATI Journal of Biosciences Vol. 13 No.3 Tahun 2006
No full textThe research aim was to examine the enhancement of catharanthine content in Catharanthus roseus callus culture added with different concentration of Naphtalene Acetic Acid (NAA). NAA treatment produced callus that formed hairy roots. Fresh and dry weight of callus increased as the increasing of NAA concentration. The catharanthine content of C. roseus callus culture was increased by adding NAA as well. The highest catharanthine content was found in 2.5 ppm NAA added callus
The Enhancement of Catharanthine Content in Catharanthus roseus Callus Culture Treated with Naphtalene Acetic Acid
Get PDFThe research aim was to examine the enhancement of catharanthine content in Catharanthus roseus callus culture added with different concentration of Naphtalene Acetic Acid (NAA). NAA treatment produced callus that formed hairy roots. Fresh and dry weight of callus increased as the increasing of NAA concentration. The catharanthine content of C. roseus callus culture was increased by adding NAA as well. The highest catharanthine content was found in 2.5 ppm NAA added callus. Key words: Catharanthus roseus, callus, catharanthine, NA
Medicinal plants used by the Batak Toba Tribe in Peadundung Village, North Sumatra, Indonesia
Get PDFSilalahi M, Nisyawati, Pandiangan D. 2019. Medicinal plants used by the Batak Toba Tribe in Peadundung Village, North Sumatra, Indonesia. Biodiversitas 20: 510-525. Research of the medicinal plants by the Toba Batak ethnic has limited, even though the globalization and modernization resulted to degradation of the local knowledge. The objectives of this study were (i) documentation of medicinal plants used in the traditional therapies by the Batak Toba tribe of Peadundung Village, North Sumatra, Indonesia, and (ii) analysing the data by quantitative ethnobotanical tools such as use value (UV), cultural significance index (CSI), relative frequency of citation (RCF) and informant consensus factor (ICF) to determine the cultural importance of medicinal plants in order to develop a tool for their conservation. Semi-structured interviews with 41 identified respondents was the methodology employed for qualitative data collection. A total of 149 medicinal species of plants, belonging to 131 genera and 55 families, were recorded in the study which are used in the treatment of 21 categories of ailments. Plants with the highest UV were Eurycoma longifolia (UV=3.44), Curcuma longa (UV=2.67) and Zingiber officinale (UV=2.60). Eight species, namely Curcuma longa, Eurycoma longifolia, Allium cepa, Psidium guajava, Aleurites moluccanus, Piper betle, Citrus hystrix and Uncaria gambir were found to be having the highest RCF value of 1.00. Eurycoma longifolia (CSI=126), Curcuma longa (CSI=112) and Zingiber officinale (CSI = 105) emerged as the culturally most significant medicinal plants. Thrush and aphrodisiac use categories received the highest ICF of 1.00 each because the informants agreed of using only a single species for each of these category. Eurycoma longifolia was used as an aphrodisiac whereas Averrhoa carambola was used against thrush. All these important and significant plants suffer the greatest harvesting pressure, hence their conservation should be given priority
Aktivitas Antibakteri Ekstrak Metanol Tumbuhan Paku diantum capillus-veneris dan Asplenium nidus Terhadap Bakteri Gram Negatif Escherichia coli Dengan Metode Difusi Agar
Get PDFPenelitian ini bertujuan untuk menguji aktivitas antibakteri ekstrak metanol tumbuhan paku Adiantum capillus-veneris dan Asplenium nidus terhadap pertumbuhan bakteri Gram negatif Escherichia coli. Pengujian aktivitas ekstrak menggunakan Metode Difusi Agar (tes Kirby Bauer), yaitu metode difusi dengan kertas cakram untuk menentukan aktivitas antimikroba. Hasil penelitian diperoleh ekstrak metanol Adiantum capillus-veneris memiliki aktivitas dalam menghambat pertumbuhan Escherichia coli pada konsentrasi ekstrak 30%, 60% dan 90% dengan diameter zona hambat berturut-turut 0.00 mm, 0,00 mm dan 6,80 mm. Ekstrak Asplenium nidus menghambat pertumbuhan Escherichia coli pada konsentrasi 30%, 60% dan 90% dengan diameter zona hambat berturut-turut 3,60 mm, 7,20 mm dan 12,50 mm. Berdasarkan hasil penelitian dapat disimpulkan bahwa ekstrak Adiantum capillus-veneris pada konsentrasi 90% menghambat Escherichia coli pada kategori sedang. Ekstrak Asplenium nidus tergolong dalam kategori sedang dan kuat dalam menghambat bakteri Gram negatif Escherichia coli sehingga memiliki potensi untuk dikembangkan sebagai bahan dasar antibakteri.The aim of this research to test the methanol extract activity of Adiantum capillus-veneris and Asplenium nidus on the growth of Gram negative bacteria Escherichia coli. Testing activity of the extracts to bacterial using the Kirby-Bauer method, is the paper disk diffusion method. The results are Adiantum capillus-veneris extract inhibit the growth of E. coliat concentrations of extract 30%, 60% and 90% with inhibition zone diameter respectively 0.00 mm, 0.00. mm and 6.80 mm; and Asplenium nidus extract inhibit the growth of E. coli with inhibition zone diameter respectively 3.60 mm, 7.20 mm and 12.50 mm. Based on the results obtained that the extract of Adiantum capillus-veneris classified in medium category and Asplenium nidus extract in medium and strong category activity toward Gram negative bacteria Escherichia coli, so that has potential as a base material antibacterial
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
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