1,720,994 research outputs found
Sphingomyelinase metabolites control survival and apoptotic death in SH-SY5Y neuroblastoma cells
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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
Arbuscular mycorrhizal symbiosis and phosphorus supply induce changes in photosynthetic rate, sugar partitioning and steviol glycosides composition in stevia
No full textThis study aimed to evaluate the physiological and phytochemical responses of Stevia rebaudiana to arbuscular mycorrhizal fungi (AMF) inoculation (Rhizoglomus irregulare) and P fertilization (0, 25 and 50 mg P2O5 kg-1 of substrate). At the end of the vegetative phase, AMF colonization, growth parameters (leaf specific weight, harvest index and below-ground biomass), steviol glycosides (SVglys) concentration and composition, leaf gas exchanges, photosynthetic pigments and soluble sugar content, were assessed. The inoculated plants showed increased harvest index, reduced specific leaf weight and a significant increase of total soluble sugars and total monosaccharides in their roots. Both AMF and P fertilization had meaningful effects on stevia, modifying sugar partitioning and stimulating leaf gas exchanges. AMF × P interaction positively affected SVglys concentration and composition, shifting the pathway towards the production of rebaudioside A, B and C. So, a highest rebaudioside (A+B+C) to stevioside ratio was observed in all inoculated plants, to indicate an increased stevia leaf quality in terms of organoleptic properties
Camelina sativa (Crantz.) from minor crop to potential breakthrough
No full textCamelina (Camelina sativa (L.) Crantz) is an herbaceous oilseed crop, belonging to the Brassicaceae family, originated from Central and Eastern Europe. Despite the low genetic diversity, due to its evolutionary history, the preferential self-fertilization, and lost varieties, breeding efforts to improve its germplasms are ongoing. Camelina can adapt to different pedoclimatic conditions, from the particularly severe winters of Boreal temperate areas to the critically arid climate of tropical zones. This crop shows significant compatibility with existing farming practices, requires lower agricultural inputs (in terms of water, pesticides, and nutrients) compared to other traditional oilseed crops, is characterized by a very short crop cycle, and can be easily grown on poor and marginal lands. For these reasons, camelina is suitable for less favored areas and represents a valuable resource to fight and to adapt agricultural systems to climate change. Albeit, it has long been considered a minor crop, in the last years, camelina has aroused interest for several positive characteristics that have conferred it advantages over other oilseed crops, and its cultivation has grown especially in North America and Europe. First, its seed oil content can easily exceed 40%, with a profile unusually rich of polyunsaturated fatty acids, especially α-linolenic acid, and, after oil extraction, the residual oilseed cake is still rich in high value nutritional compounds. Therefore, camelina seeds, oils, and seed meals or cakes are becoming increasingly important as ingredients for functional foods and cosmetics
Characterization and epidemiology of Colletotrichum acutatum sensu lato (C. chrysanthemi) causing Carthamus tinctorius anthracnose
No full textIn 2012, Colletotrichum isolates were collected from field-grown safflower (Carthamus tinctorius) crops in central Italy from plants exhibiting typical anthracnose symptoms. Colletotrichum isolates were also collected from seed surfaces and from within seeds. The genetic variability of these isolates was assessed by a multilocus sequencing approach and compared with those from Colletotrichum chrysanthemi and Colletotrichum carthami isolates from different geographic areas and other Colletotrichum acutatum sensu lato-related isolates. Phylogenetic analysis revealed that all of the strains isolated from C. tinctorius belonged to the species described as C. chrysanthemi, whereas all of the strains belonging to C. carthami had been isolated from Calendula officinalis. Phenotypic characterization of isolates was performed by assessing growth rates at different temperatures, morphology of colonies on potato dextrose agar (PDA) and the size of conidia. All C. chrysanthemi isolates from safflower had similar growth rates at different temperatures, comparable colony morphologies when grown on PDA and conidial sizes consistent with previously described C. chrysanthemi isolates. Pathogenicity tests were performed by artificially inoculating both seeds and plants and confirmed the seedborne nature of this pathogen. When inoculated on plants, C. chrysanthemi caused the typical symptoms of anthracnose on leaves. This is the first record of this pathogen on C. tinctorius in Italy, and it presents an updated characterization of Colletotrichum isolates pathogenic to safflowers in Europe
Essential oil composition of two Thymus vulgaris L. chemotypes under organic cultivation in Tuscany
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