1,721,139 research outputs found
Use of principal component analysis and cluster analysis for differentiation of traditionally-manufactured vinegars based on phenolic and volatile profiles, and antioxidant activity
No full textSagdic, Osman/0000-0002-2063-1462; KARADAG, AYSE/0000-0001-8615-7321This study aimed to characterize twelve vinegar samples produced by the traditional method with the use of whole fruits and without any preservatives in terms of their physicochemical properties, total phenolic content (TPC), total flavonoid content (TFC), phenolic compound profiles, antioxidant activity (DPPH center dot scavenging activity, FRAP, CUPRAC), and volatile compositions, as well as their abilities to delay oxidation in mayonnaise. Types of raw material significantly affected all of the above parameters (p0.70) was determined between DPPH center dot scavenging activity of vinegars and induction period of accelerating oxidation based on the OXITEST of mayonnaises produced with these vinegars. Vinegar types significantly affected the oxidative stability of mayonnaise (p<0.05). Furthermore, it was demonstrated that vinegar samples could be clearly discriminated by principal component and cluster analyses. This study suggests that fruit type should be considered as a crucial factor in the production of vinegars affecting not only sensory properties but also their physicochemical and bioactive properties
An evaluation of FTIR spectroscopy for prediction of royal jelly content in hive products
No full textSagdic, Osman/0000-0002-2063-1462; BOZKURT, FATIH/0000-0003-4905-095XIn this work, a rapid FTIR-ATR spectroscopic method combined with chemometrics was developed to predict royal jelly content in hive products; namely, dietary supplements such as royal jelly, propolis, honey and pollen. FTIR spectra of royal jelly, propolis, honey and pollen as well as their mixtures and dietary supplements were characterized. Amide II spectral absorption band with a peak point around 1547 cm(-1) in the spectral range 1580-1500 cm(-1) was used for quantitative estimation based on the calibration method using Partial Least Squares Regression (PLSR) and principal component regression (PCR) analyses. The results from the developed FTIR technique were also validated by those from HPLC-PDA technique, revealing a good correlation between FTIR and HPLC results (R-2 = 0.99). The results of the present study suggest that the developed FTIR spectroscopy technique can be used to rapidly, easily and accurately predict the royal jelly content in the hive products
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
Sensitivity of four pathogenic bacteria to Turkish thyme and oregano hydrosols
No full textThe two thyme (Thymus vulgaris L. and Thymus serpyllum L.) and three oregano (Origanum vulgare L., Origanum onites L. and Origanum majorana L.) hydrosols, widely used in food products and as drinks, were tested for their inhibitory effects against four pathogenic bacteria (Escherichia coli ATCC 25922, E. coli O157:H7 ATCC 33150, Staphylococcus aureus ATCC 2392 and Yersinia enterocolitica ATCC 1501). Two principles were used in determining the antibacterial effects of spice hydrosols: inhibition zones were determined by paper disc diffusion method, and the bacteriostatic effects, bactericidal effects and the growth inhibition levels were studied as colony forming units (cfu) in broth cultures. All tested bacteria were inhibited by all of the spice hydrosols using paper disc diffusion method. According to serial dilution method, while all spice hydrosols at 10 and 25 mL/100 mL concentrations had generally bacteriostatic activities, the same hydrosols appeared to have bactericidal effects at concentrations above 50 mL/100 mL. The most sensitive of the bacteria against the spice hydrosols was S. aureus. In addition, the most inhibitive of the spice hydrosols on the four pathogenic bacteria were O. onites L. and O. majorana L. (C) 2003 Swiss Society of Food Science and Technology. Published by Elsevier Science Ltd. All rights reserved
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
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