1,720,971 research outputs found
Corresponding Author Isolation and Identification of Heavy Metal Resistant Bacteria from Industrial Wastewaters in Guilan Province
No full textABSTRACT Heavy metal pollution by natural factors is a world-wide phenomenon. Release of large quantities of heavy metals without handling proper processes that could decrease the concentration of such a material is a hassle that makes strains resistant to these heavy metals apart from entering into human food chain. In this research, wastewater of four firms in Guilan province such as Foolad, Risandegi, Chooka and Ganje tannery were analyzed according to standard methods. These methods were included culturing the strains on the specified media such as Luria-Bertani agar and Kings' B. In the wastewater of these factories, there were kinds of heavy metals such as Chromium, Nickel, Cobalt, Mercury and etc. However existence of these heavy metals is fatal to keep the life progressive, but a kind of creatures like some bacteria could adapt themselves to the condition. Here we mentioned two genera of bacteria, Bacillus sp. and Pseudomonas sp., which were more renowned in the category of resistance to heavy metals. First of all, we used Nutrient Agar medium in order to distinction of Gram positive bacteria from Gram negative ones. After that, by dilution preparation from sample and inoculation the bacterial suspension into medium, the range of resistance to heavy metal concentration for Bacillus sp. in Luria-Bertani Agar and for Pseudomonas sp. in Kings' B medium were determined. This estimation was validated by adding salt of heavy metal by the concentration from 0 µg/ml through 100 µg/ml and pH from 5 to 9. Results showed that both of two isolates had the most accumulation rate in pH=7 and concentration of 50 µg/ml heavy metal
International Journal of Molecular and Clinical Microbiology Frequency of neonataland children bacterial meningitis and determining their antibiotic sensitivity patterns in Hospitals of Iran
No full textMeningitis is one of the most important causes of infant mortality and its early and proper diagnosis is of great importance, but there are currently no laboratory facilities optimized and fast in detection of meningitis pathogens. The current standard of bacterial meningitis diagnosis is microscopic examination and cerebrospinal fluid (CSF) culture. This research aimed at isolating the most common bacteria infecting cerebrospinal fluid and determining their antibiotic sensitivity patterns for cerebrospinal fluid of newborns with meningitis admitted in Hospitals of Iran. The study was carried out on 680 cerebrospinal samples from newborns and children during 2013-2014. From among the 680 newborns and children of interest who were LP according to the doctor's order, 35 had positive cultures. In the present research, the resistance pattern and antibiotic sensitivity of the bacteria isolated were also examined. H.influenzae was the most prevalent isolate from newborns and E.coli took second place. The most isolated sample was Haemophilus and a large number of this bacterium was sensitive to kanamycin, gentamicin and chloramphenicol. These antibiotics can be used for early empiric treatment of meningitis. Many of these bacteria were resistant to sulfamethoxazole, ampicillin, and amoxicillin and their prescription is not recommended
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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