1,720,957 research outputs found
Biochar as growing substrate component for potted Murraya paniculata
No full textBiochar soil amendment can boost plant productivity by improving the soil's biological, chemical, and physical properties. Up to date few studies were conducted on the use of biochar as partial substitute of peat in growing substrates for the horticultural and nursey industries, even less for the production of containerized ornamentals. With the aim to evaluate the agronomical performances of conifers wood biochar as a component for peat-reduced soilless substrates for ornamental species, a greenhouse experiment was carried out on potted Murraya paniculata (L.) Jacq. Plants were grown using the following mixtures: 0, 25, and 50% (v/v). Biochar amendment of substrates significantly affected growth and ornamental quality of potted Murrayas as a decrease of plant height, leaf area, leaf numbers, flower production, biomass yield and water use efficiency was recorded when plants were grown with 50% biochar. Highest values were observed with 0 and 25% biochar. Our results seem to suggest that conifers wood biochar could be used up to 25% as component in peat-based substrates for potted Murrayas
Coniferous wood biochar as substrate component of two containerized Lavender species: Effects on morpho-physiological traits and nutrients partitioning
No full textPeat moss continued to be, though the exploitation of peatlands due to the peat extraction, the most important and used growing substrate in the nursery production of containerized ornamental plants. Biochar, the by-product of the pyrolysis technology for bio-energy process from organic feedstocks, has been recently demonstrated a promising replacement substitute for peat in ornamentals production. An experiment was carried out in order to evaluate the differences on growth, ornamental quality and nutrients partitioning of two Lavender species (Lavandula angustifolia and L. dentata) grown in a peat-based growing substrate amended with coniferous wood biochar at 0%, 25 %, 50 % or 75 % (by volume). Increasing biochar content of growing substrates resulted in an increase of several chemical and physical properties such as electrical conductivity, pH, bulk density and total porosity and in a decrease of water retention capacity as well as in nutrients availability (P, Ca and Mg). Higher biochar percentages in the substrate negatively affected growth pattern and physiological traits of the potted plants, due to suboptimal conditions of growing substrates. Lavenders grown with 25 % biochar showed similar growing and qualitative response in terms of number of leaves, root length, biomass production and biomass water use efficiency, compared to those cultivated with 0% biochar, due to an enhanced SPAD index, photosynthetic pigments biosynthesis and leaf nutritional status (higher nitrate, P and K). Overall, our experimental data demonstrated that a peat-based substrate amended with 25 % of coniferous wood biochar could be adopted as a sustainable production system for containerized lavenders, with no negative effects on plant growth and ornamental 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
Drought tolerance in ornamental plants used for green design in urban areas
No full textThe choice of plants with low impact of maintenance is an important purpose for green design in the urban Mediterranean areas, since the climate is characterized by hot, dry summers, and mild, wet winters. The plants growing in this region are frequently subjected to drought stress during summer, so the drought tolerance is required for a sustainable management of ornamental plants. The aromatic plants represent good candidates, due to their rusticity and for the production of volatile organic compounds (VOCs). This research represents a part of the INTERREG-ALCOTRA Project “AROMA” dealing with the investigation of aromatic plants for environmental and productive activities. Two different species (Salvia dolomitica Codd. and S. sinaloensis Fern.) have been cloned and treated in controlled environmental conditions with three irrigation regimes (100%, 50% and 0% of container capacity - CC), in order to characterize their drought resistance at morphological and physiological levels. The obtained results indicated that the plants are tolerant to mild drought stress (50% CC), but exhibited a different behavior under severe drought condition (0% CC). Different responses between species are observed, particularly on water potential, growth index, and on primary and secondary metabolites composition (pigments and VOCs)
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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