1,720,977 research outputs found
Modeling the morphogenetic and ontogenetic changes in essential oil composition of Hypericum perforatum
No full textIn this research, prediction models for the content of several volatile constituents, namely, oxygened hydrocarbons, monoterpenes, oxygened monoterpenes and sesquitterpenes hydrocarbons were developed for Hypericum perforatum growing in Northern Turkey. Wild growing plants were harvested at vegetative, floral budding, full flowering, and fresh fruiting. Actual chemical content of plant materials was measured by The Gas Chromatography-FID and Gas Chromatography-Mass Spectrometry Analyses. Multiple regression analysis was performed for each volatile group to develop the models. R2 values varied with 0.56 and 0.96 depending of the volatile constituents examined. All R2 values and standard errors were found to be significant at the levels of P<0.05 and P<0.00
The green image of processed food by MAPs raw material quality
No full textThe green image of processed food by MAPs raw material quality
Alessandra Bertoli
Department of Pharmacy, University of Pisa, Via Bonanno, 6 56126, Pisa, Italy [email protected]
In the last few years the reduction or elimination of pathogens in food has increasingly oriented to substitution of synthetic food additives with different types of MAPs (Medicinal and Aromatic Plant) derivatives, which are added directly to foods or incorporated in the food packages. These new food formulations may answer simultaneously to the WHO recommendation to reduce the consumption of salt to decrease the incidence of cardio-vascular disease as well as to satisfy the worldwide demand of products with a reduced impact on the environment.
Spices, essential oils, and plant extracts have been studied for their antibacterial and antioxidant properties since long time, but it is only recently that these data are used in the food production with safe and natural or ‘green’ image. In fact, the addition of MAP derivatives in processed foods can extend their shelf life without the more toxic effects of chemical preservatives. Most of essential oils (EOs) in food industry have been recognised as “ Generally Safe” (GRAS definition) by the American Food and Drug Administration and have a broad spectra of antimicrobial action against different pathogenic and spoilage microorganisms. In addition, due to their wide range of phytochemicals, MAps and derivatives are still debated on the possibility they can even result in beneficial health effects for the consumer. Most studies on the raw EOs generally show that they are slightly more active against Gram positive than Gram negative. This activity has to be related to EO quali-quantitative composition and the interactions among the different compounds. Further data have to be recorded to quantify microbial resistance or to explain the mechanism in the foodstuffs directly as bacterial sensitivity can also influenced by several factors due to both intrinsic food properties and extrinsic processing parameters.
However, whatever MAPs derivatives have been used as additives, food production protocols should make their "green image" be coherent with their effectiveness as food preservative by guarantying first of all MAP raw material quality
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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