1,723,604 research outputs found
Supernova 2010ks in UGC 5622
No full textReport the CRTS discovery of an apparent supernova in public images from Catalina Sky Survey (CSS). SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010ks Dec. 11.46 10 23 42.44 +33 46 49.0 17.0 7".8 E, 22".0 N Further unfiltered CCD magnitude estimates of 2010ks: June 15.20 UT, [19.3 (CSS); Dec. 12.42, 17.4 (LB-1 0.6-m telescope at Rodeo, NM). The presumed host galaxy, UGC 5622, has redshift z = 0.033...
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
Purification and characterization of antibiotic anthracyclins from a mutant strain of Streptomyces olindensis DAUFPE 5622
No full textA espécie Streptomyces olindensis DAUFPE 5622 produz o complexo antibiótico retamicina, que apresenta atividade contra leucemia em seres humanos mas possui limitações de uso devido ao seu grande efeito cardiotóxico. Uma linhagem mutante de S. olindensis, So20, obtida por tratamento da linhagem selvagem com MMS (metanossulfonato de metila), apresentou diferença qualitativa quanto à produção deste complexo antibiótico. O extrato metanólico das células desta linhagem mutante sofreu diversos tratamentos com solventes orgânicos e foi submetido a diversas técnicas de separação cromatográfica. Algumas substâncias foram parcialmente isoladas e foram submetidas a análise espectrométrica, que indicaram diferenças nas suas estruturas com relação ao complexo obtido da linhagem selvagem DAUFPE 5622. Algumas destas frações parcialmente purificadas da linhagem mutante foram testadas quanto a sua atividade antimicrobiana, contra Bacillus subtilis 007, e quanto sua capacidade de intercalação em fragmentos de DNA em gel de eletroforese, no ICB-USP, indicando resultados promissores.Streptomyces olindensis DAUFPE 5622 species produces the antibiotic complex retamycin, which are active against human leukemia, but is still not used in human treatments due to its cardiotoxic effects. The S. olindensis mutant, So20, obtained by treatment with MMS (methyl methanesulfonate), showed qualitative differences in the antibiotic production. The methanolic extract from these mutant strains cells was purified by means of solvent partition and by chromatographic purification techniques. Some compounds were partially purified and the analysis of their spectrometric data indicated structural differences from that obtained from DAUFPE 5622 strains. Some of these partially purified substances from mutant strains were tested for their antimicrobian activity, against Bacillus Subtilis 007, and for their DNA intercalation ability on eletroforesis gel, in the ICB-USP laboratories, showing promising results
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
Purification and characterization of antibiotic anthracyclins from a mutant strain of Streptomyces olindensis DAUFPE 5622
No full textA espécie Streptomyces olindensis DAUFPE 5622 produz o complexo antibiótico retamicina, que apresenta atividade contra leucemia em seres humanos mas possui limitações de uso devido ao seu grande efeito cardiotóxico. Uma linhagem mutante de S. olindensis, So20, obtida por tratamento da linhagem selvagem com MMS (metanossulfonato de metila), apresentou diferença qualitativa quanto à produção deste complexo antibiótico. O extrato metanólico das células desta linhagem mutante sofreu diversos tratamentos com solventes orgânicos e foi submetido a diversas técnicas de separação cromatográfica. Algumas substâncias foram parcialmente isoladas e foram submetidas a análise espectrométrica, que indicaram diferenças nas suas estruturas com relação ao complexo obtido da linhagem selvagem DAUFPE 5622. Algumas destas frações parcialmente purificadas da linhagem mutante foram testadas quanto a sua atividade antimicrobiana, contra Bacillus subtilis 007, e quanto sua capacidade de intercalação em fragmentos de DNA em gel de eletroforese, no ICB-USP, indicando resultados promissores.Streptomyces olindensis DAUFPE 5622 species produces the antibiotic complex retamycin, which are active against human leukemia, but is still not used in human treatments due to its cardiotoxic effects. The S. olindensis mutant, So20, obtained by treatment with MMS (methyl methanesulfonate), showed qualitative differences in the antibiotic production. The methanolic extract from these mutant strains cells was purified by means of solvent partition and by chromatographic purification techniques. Some compounds were partially purified and the analysis of their spectrometric data indicated structural differences from that obtained from DAUFPE 5622 strains. Some of these partially purified substances from mutant strains were tested for their antimicrobian activity, against Bacillus Subtilis 007, and for their DNA intercalation ability on eletroforesis gel, in the ICB-USP laboratories, showing promising results
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
- …
