1,720,963 research outputs found
Spazio alle nuove specie: actinidia, piccoli frutti, tropicali
No full textDopo il grande successo dell’actinidia sono stati tanti i tentativi di portare in Italia nuove specie da frutto per diversicare il panorama produttivo di aree in crisi strutturale e commerciale con le colture più tradizionali. Il Centro-Nord ha puntato
sui piccoli frutti, ora il Sud punta alle specie sub-tropicali.
Il mercato ha voglia di novità, ma non tutto si presta ad una diffusione su larga scala
Screening and evaluation of Rhododendron progenies for alkaline pH tolerance
No full textRhododendrons are well-known woody ornamental plants. However, they are typical calcifuges and cannot grow well in lime soils with alkaline pH. Screening genotypes tolerant to higher pH is the basis for the breeding of new cultivars with enhanced alkaline tolerance. Plant phenotyping based on chlorophyll fluorescence imaging allows the early detection and non-destructive screening for abiotic stress of small seedlings. In this study, the seeds of four cross combinations of Rhododendron genotypes were germinated in vitro on media with pH 5.4 and 8.3. First, the top 25% of best-performing seedlings at both pH-levels were selected based on the chlorophyll fluorescence images and calculated Fv/Fm values 40 days after sowing the seeds. Subsequently, an experiment was set up to compare the alkaline tolerance in the two selected groups of seedlings. Thereto the selected seedlings were grown for one month on rooting medium at pH 5.4, after which an alkaline shock treatment was applied on 10 randomly selected seedlings by adding 250 mmol L‑1 NaHCO3 to the medium. The stress tolerance was examined by chlorophyll fluorescence imaging during the first 10 days after the shock treatment. The results indicated that Fv/Fm and ΦPSII allow for early detection of the response of Rhododendron seedlings to alkaline stress. The screening method can help to identify and select seedlings with improved tolerance to alkaline stress as was clearly shown in one of the crosses. The evaluation method can non-destructively and effectively detect the alkaline tolerance levels among crosses. The screening and evaluation methods as well as screened seedlings provide additional knowledge and material for breeding
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
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