1,721,009 research outputs found
Anatomical and phytochemical analyses of Achillea lingulata Waldst. et Kit. herba, Asteraceae
No full textAchillea lingulata Waldst. et Kit. (Asteraceae) je вишегодишња зељаста биљка планинског, субвисокопланинског и високопланинског појаса Балканског полуострва (осим у Грчкој) и Румуније.Achillea lingulata Waldst. et Kit. (Asteraceae) is a perennial plant that grows on the Balkan Peninsula mountains (except in Greece) and Romania
Antimicrobial activity of essential oil isolated from Satureja montana L. herba (Lamiaceae) in different phenological stages
Full text linkУвод: Неоправдана употреба антибиотика довела је до појаве учестале резистенције бактерија на антибиотике која је препозната као глобални проблем. Обећавајућа алтернатива у решавању овог проблема представљају етарска уља.
Циљ рада: Испитивање садржаја и хемијског састава етарског уља хербе Satureja montana у фази: пре цветања, цветања и плодоношења и утврђивање његове антимикробне активности.
Материјал и методе: Етарско уље је изоловано дестилацијом воденом паром, а квалитативна и квантитативна анализа је извршена методом GC-FID/MS. Евалуација антимикробне активности спроведена је бујон микродилуционом методом, очитавањем минималне инхибиторне концентрације (МИК). Коришћено је 8 стандардних микроорганизама: Грам-позитивне бактерије: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis; Грам-негативне бактерије: Escherichia coli, Klebsiella pneumoniae, Salmonella abony, Pseudomonas aeruginosa и квасница: Candida albicans.
Резултати: Доминантна компонента у сва три узорка уља био је тимол. Најбољи антимикробни потенцијал је показало етарско уље хербе из фазе плодоношења и то на Грам-позитивне бактерије (МИК 200 mcg/mL). Висок степен осетљивости на сва три уља утврђен је и за квасницу Candida albicans (MИК 200 mcg/mL). P. aeruginosa је била резистентна на сва три уља, у тестираном опсегу концентрација.
Закључак: Резултати ове студије потврђују антимикробни потенцијал етарских уља и чињеницу да биолошка активност уља зависи од хемијског састава.Introduction: Unjustified use of the antibiotics has led to the emergence of increased resistance of bacteria to antibiotics, recognized as a global problem. Essential oils are a promising alternative to solving this problem.
The Aim: Investigation of the content and chemical composition of Satureja montana essential oil isolated in stages: before flowering, flowering and fruiting and determination of its antimicrobial activity.
Material and Methods: Essential oil content was determined by hydrodistillation, and qualitative and quantitative analysis was performed by GC-FID/MS. Evaluation of antimicrobial activity was performed using the broth microdilution method, by reading the minimum inhibitory concentration (MIC). Eight standard microorganisms were used: Gram-positive bacteria: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis; Gram-negative bacteria: Escherichia coli, Klebsiella pneumoniae, Salmonella abony, Pseudomonas aeruginosa and yeast: Candida albicans.
Results: The dominant compound in all three oil samples was thymol. The best antimicrobial potential was shown by the essential oil of herb from the fruiting phase on Gram-positive bacteria (MIC 200 mcg/mL). A high degree of sensitivity to all three oils was also determined for the yeast Candida albicans (MIC 200 mcg/mL). P. aeruginosa was resistant to all three oils, in the tested concentration range.
Conclusion: The results of this study confirm the antimicrobial potential of essential oils and the biological activity of oils depends on the chemical composition
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
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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