1,720,967 research outputs found
Identification of Streptomyces sp-MWS1 Producing Antibacterial Compounds
No full textAn actinomycete, designated Streptomyces sp-MWS1, was isolated from mangrove ecosystem soil in the eastern coast of Surabaya. This organism was capable of producing a series of antibiotics that strongly inhibit the growth of Gram-positive and Gram-negative bacteria. Furthermore, culture morphological and physiological characteristics of the isolated strain, Streptomyces sp-MWS1 were compared to other reference strains belong to Streptomyces species. The analysis of nucleotide sequence of the 16S rDNA indicated similarity binary 98% with Streptomyces species.</jats:p
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
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
Karakterisasi Pola Gen 16s Rrna Streptomyces sp. Penghasil Antibiotik Isolat Tanah Ekosistem Mangrove di Jawa Timur
Get PDFThe anti microbial activities were determined by agar diffusion modified method by using Nutrient agar medium and Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853, Escherichia coli ATCC 25922, Bacillus subtilis, Salmonella typhimurium as test microorganisms. Six spesies were showed anti microbial activity expressed as clear zone around the colonies agar (diameter 0,8 cm, height 3 mm). Diameters of the clear zone were observed each 24 hours for 10 days in order to establish diversity of the anti microbial activities.
The profile of antimicrobial power of four Streptomyces sp. Isolates reveal different activities. Streptomyces sp. 2 has the highest activity in inhibiting Staphylococcus aureus ATCC 25922 at day 5 with inhibitory zone diameter as much as 29.2 mm, and Salmonella typhimurium at day 7 with inhibitory zone diameter as much as 27.5 mm, Streptomyces sp.-3 has the highest activity in inhibiting Pseudomonas aeruginosa TCC 27853 at day 6 with inhibitory zone diameter of 42.4 mm. Streptomycces sp.4 has the gighest activity in inhibiting Bacilluss subtilis at day 5 with inhibitory zone diameter of 20.7 mm.
Phylogenetic analyses based on PCR showed that they formed distict phyletic band. Three isolates (sp.-1, sp.-3, and sp.-4) were determined based on their 16s rRna sequences. These isolates were assigned to genus Steptomyces. It is evident that by an partial 16s rRna gene sequence of the strain that it formed a distinc pyletic line within the range of variation encompassed by the genus Streptomycetes and the sharp separation of the organism from representatitves of the genus Streptomyces was strengthened by the fact that is sequencing 16S Rrna differed from those of 1589 recognized Streptomyces spesies.
Key words: Streptomyces, mangrove, 16S rRNA gene, antibioti
Upaya Pengembangan Biodesel Untuk Penyediaan Energi Terbarukan Menggunakan Microalga Clorella Sp Strain Lokal
Get PDFKetahanan energi menjadi salah satu isu nasional di Indonesia, sehingga perlu mendapat perhatian dari semua komponen bangsa, sebab krisis di bidang energi ini dapat berdampak pada banyak sektor, yang tidak hanya sebatas pada sektor ekonomi tetapi juga sektor politik, keamanan, kesehatan, lingkungan, dan kemanusiaan. Universitas Airlangga sebagai bagian dari komponen bangsa memiliki tanggung jawab dalam menjaga ketahanan energi nasional, dengan menjadikan riset penyediaan energi terbarukan dari sumber hayati yang melimpah di Indonesia sebagai salah satu unggulan dalam pengembangan raadmap penelitiannya. Lingkungan perairan Indonesia memiliki keanekaragaman hayati mikroalga yang sangat tinggi, tetapi potensinya belum dimanfaatkan secara maksimal. Di banyak negara, mikroalga telah dimanfaatkan untuk agen produksi biofuel, sebab mikroalga mampu menghasilkan asam lemak dan karbohidrat yang tinggi. Melalui proses esterifikasi, asam lemak mikroalga dapat dikonversi menjadi biodiesel
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