1,721,163 research outputs found
Growth response and nitrogen use efficiency of two dieffenbachia cultivars grown in soilless culture
No full textLa qualità dei prodotti orticoli freschi: influenza dei fattori in pre-raccolta
No full textConsumer interest in the quality of vegetable
products has increased in recent years.
Regular consumption of vegetables has been linked
to a reduction of some diseases, since vegetable is a
source of an array of phytochemicals, which are
appreciated for their benef icial heal th ef fects.
Vegetable quality is a complex issue with different
means depending to the target customer group.
Quality has both a product- and a consumer-dependent
dimension. From the first perspective, quality
attributes are inherent in a product and can be objectively
quantified, whereas a consumer orientation,
which defines quality in terms of user satisfaction, is
much less tangible and less quantifiable concept. This
review will be focused only on product-oriented quality
and objective criteria for its evaluation. Standard for
quality assessment of fresh vegetables are established
in Europe and North and Central America.
However, they take into consideration mostly external
quality attributes (e.g. size, shape, color, absence of
defects and decay, critical concentrations of pesticides
and nitrate), whereas very important internal
quality attributes such as texture, flavor and healthpromot
ing compounds are not considered.
Environmental conditions, crop management and
physiological factors may modify the vegetable quality.
The purpose of this paper is to review the recent literature
dealing with the main pre-harvest factors that
can modify the quality of vegetables and, in particular,
the physical properties, flavor, and health–related
compounds. First of all, the importance of the genotype
and grafted plants selection, the optimization of
the environmental conditions and the advantages and
disadvantages of protected environments in comparison
to open field cultivation concerning product quality
will be outlined. Then, the effects of the optimization of
agricultural practices, in particular water quantity and quality, mineral nutrition and growing systems (e.g.
soilless culture), will be discussed. The review highlighted
that vegetable quality is a product of the interaction
of genetic, climatic, and cultural factors. Finding
the best combinations of those factors to maximize
vegetable quality according consumer demand will be
a challenge. The use of novel cultural practices and
development of new genetic lines to enhance the
quality of vegetables are the main directions that
research should take in the near future. Integrated
quality production and management must be considered
as a global target to reach
Plant biostimulants: New tool for enhancing agronomic performance and fruit quality of cucurbits
No full textPlant biostimulants are substances (i.e., humic and fulvic acids, protein hydrolysates and seaweed extracts) and microbial inoculants (i.e., mycorrhizal fungi and plant growth promoting rhizobacteria-PGPR) that have been introduced as an efficient, safe and sustainable tool to optimize root system thus boosting crop performance, and nutrient use efficiency as well as enhancing tolerance to environmental stressors in vegetable crop production. The stimulation of biomass production in response to biostimulant application has been often associated to the action of specific signaling molecules on plant metabolism and physiology. Several trials have shown that Cucurbit crops can also benefit from the application of biostimulants. Early application at transplanting or in nursery of arbuscular mycorrhizal fungi (Rhizoglomus irregulare and Funneliformis mosseae) or vegetal biopolymer-based biostimulant on several Cucurbit crops (e.g., cucumber, melon, zucchini) were able to boost root growth and to activate defense mechanisms against environmental stresses (e.g., salinity, soil acidty and alkalinity). Moreover, foliar applications of biostimulant substances during the growing cycle were also effective in promoting crop productivity and increasing nutritional and functional quality in Cucurbit crops. Several examples will be presented and discussed together with possible mechanisms involved
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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