1,720,969 research outputs found
Risposta allo stress salino di Callistemon citrinus (Curtis) Stapf e Viburnum lucidum L.
No full textClosed-loop soilless cultivation system of Curcuma alismatifolia under moderate saline stress
No full textClosed or virtuallyclosed (nodrain) growing systems, where water is recovered and reused, can maximize resources use efficiency and minimize the runoffrelated environmental pollution in protected floriculture. Nevertheless these systems have high investment and running costs and must rely on high quality water, which is not always available in Mediterranean coastal regions. With the aim of contributing to the improvement of hydroponic cut flower cultivation in Southern Italy, experiments were carried out on two cultivars of Curcuma alismatifolia Gagnep (‘Pink’and 'White') to verify the response of this species to a closed growing systems. In addition, the effects of increasing the salinity of the recirculating nutrient solution (0%; 0.125% and 0.25% NaCl) were investigated on the cultivar ‘Pink’. During the experiment plant growth, number of cut flower per plant, gas exchange, water relations and leaf mineral concentration were measured. The results demonstrated that nutrients and water use efficiencies can be considerably improved upon introduction of closed soilless systems. These systems are suitable for cultivation of crops with short growing cycle such as Curcuma and other bulbous crops also in presence of moderately saline water. Indeed, since to an increasing water salinity corresponded decreasing leaf area end total plant biomass, the water uptakes were reduced. There was also a clear effect of salinity on cut flower yield and mineral composition of leaves and rhizomes that suggested to adjust the fertilizer concentration to the growth phases of the plant
Genotypic, storage and processing effects on compositional and bioactive components of fresh sprouts
No full textThe influence of Ecklonia maxima seaweed extract on growth, photosynthetic activity and mineral composition of Brassica rapa L. subsp. sylvestris under nutrient stress conditions
No full textProline and light as quality enhancers of rocket (Eruca sativa Miller) grown under saline conditions
No full textStress conditions experienced during growth may affect plant responses during post-harvest storage and eventually determine the overall quality of commercial products. In this context, we hypothesized that foliar applications of proline during the growth cycle and light exposure during post-harvest storage could be two important modulators of yield and quality parameters of rocket plants exposed to NaCl stress. Dry matter percentage increased upon NaCl treatment. However, fresh weight loss during storage did not change over time as a consequence of salt stress. High salinity (100 mM NaCl) moderately reduced both leaf nitrate (14%) and nitrite (3%) contents. Lipophilic (LAC) and hydrophilic (HAC) antioxidant activities also decreased by 10% at the highest salinization (average of two growth cycles). In contrast, during storage, LAC decreased whereas HAC increased. Proline applications reduced the leaf nitrate content during storage by 16%, increased carotenoids and chlorophyll contents in salinized plants and also increased the ascorbate leaf concentration in both salinized and non-salinzed plants. Light storage enhanced fresh weight loss in contrast to dark storage. However the exposure to light reduced leaf nitrate levels by 7% (average of two growth cycles) and contributed to maintain high leaf ascorbate concentrations over time. The combined control of plant physiological responses to environmental stressors and post-harvest storage parameters may affect the nutritional profile of fresh rocket and consequently should be considered to define standard production protocols to improve the nutritional qualities of commercial produce
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
Water Control in Cut Stems of Rose and Carnation
No full textThis PhD Thesis address, on cut flowers vase life, physiological mechanisms aimed at maintaining and regulating tissues hydration, cellular turgor, water use and senescence phenomena. Specifically we considered the effect of compatible solutes (osmoregulation) on water status, hydration state and vase life of cut stems of rose and carnation (chapter 1). In the second chapter we evaluated the application of anti-transpirant compounds that may act indirectly or directly on rose cut stems transpiration, in order to control the water use and longevity during the vase life. Finally (Chapter 3) we assessed how anti ethylene compounds may delay senescence phenomena of carnation cut stems, with the purpose to evaluate this effect in terms of on water balance, hydration and longevity during the vase life
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
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