1,720,973 research outputs found
Effetto della temperatura sulla conservazione della valerianella da IV gamma
No full textThe quality of minimally processed leafy vegetables is defined by the visual appearance and internal phytonutrient contents. The visual appearance depends on the chlorophyll content and other leaf pigments, while the phytonutrients include anthocyans, polyphenols and carotenoids. During the distribution chain the correct storage temperature can preserve for relatively long time the internal and external quality of minimally processed leafy vegetables. The aim of this work was to investigate the effect of two storage temperatures (4 and 10°C) on the quality of lamb’s lettuce (Valerianella olitoria L. Valerianella locusta ). Plants of the cv ‘Trofy’ were grown in floating system with the following nutrient solution concentration (expressed in mM): 13 N-NO3; 1.5 P; 3.5 Ca; 1.7 Mg; 9.5 Na; 8.0 Cl; 2.7 S; 0.04 Fe and micronutrients. The leaves were harvested at commercial maturity stage and minimally processed (washed, dried, graded). Then, they were packed in commercial plastic boxes and stored at 4 or 10°C. The effect of temperature was evaluated measuring the chlorophyll content and the variations of antioxidant compounds such as anthocyans, phenols and carotenoids. The anthocyans did not change in both storage temperatures, while the phenol content significantly decreased in leaves stored at 10°C after 8 days of storage. Total carotenoids, instead, decreased at both storage temperatures, but with different degradation rates
Effect of drip or subirrigation on growth and yield of Solanum melongena L. in closed systems with salty water
No full textThe study was aimed at evaluating the response of eggplant (Solanum melongena L.) to drip or subirrigation in the spring-summer typical growing conditions of the Mediterranean area, where salty water is often used. Four F1-hybrids (Talina, Nilo, Birgah and Black Bell) were grown into pots in trough benches in a recirculating water system. The EC value of the nutrient solution, prepared using NaCl-enriched water (10 mM), was 3.2-3.5 dS m 1 until the first fruit harvest and reduced to 2.3-2.5 dS m 1afterwards; the salinisation induced a nutrient solution turnover whenever the EC value exceeded 7.0 dS m-1. Nutrient solution supply with drip irrigation was 32% more than with subirrigation, due to runoff and the need of a more frequent complete renewal. As a consequence, subirrigation allowed a higher fertigation efficiency (91 vs 79%) and an easier and cheaper management of the nutrient solution; nevertheless, the water use efficiency referred to the fruit yield was similar with both the irrigation methods, since the higher water supply with drip irrigation was counterbalanced by the significant higher yield (roughly +50%) compared with subirrigation, which caused a very high accumulation of salts in the upper layer of the substrate. These results suggest that subirrigation of eggplant may be problematic with high water EC, due to high water requirements of this species
Effect of the mineral fertilization on the yield and the oil content of two cultivars of rosemary
No full textIn the years 2001-2003 two cultivars of rosemary (“Majorka pink” and “Montfort form”) were grown in peat and perlite (4:1 v/v) into plastic pots with a diameter of 22 cm. We tested the combined application of three doses of N (0–100–200 mg/plant), three of P2O5 (0–40–80 mg/plant) and three of K2O (0–100–200 mg/plant), each applied every 20 days (25 applications during the entire cycle). For each cultivar we realized a completely randomized experimental design with eight replications. Two harvests, respectively when plants were one and two years old, were done. In both the cultivars and harvests, N, P and K enhanced yield, but only N had a significant effect on the height and the diameter of the plants. The best fertilizer combination was 200 N, 40 P2O5 and 200 K2O mg/plant. N, P2O5 and K2O uptakes were respectively 10.4 g, 4.04 g and 13 g per kg of dry matter, being N:P2O5:K2O = 2.5:1:3.2. Oil content and composition were different in the two cultivars: “Majorka pink” had the highest oil content and was particularly rich in camphor; “Montfort form” in alpha-pinene, borneol and 1,8-cineole. Fertilization had different effects on the oil composition of the two cultivars, particularly on the percentage occurrence of borneol and oxygenated compounds. N and K always reduced camphor content, whereas P reduced it in “Majorka pink” and enhanced it in “Montfort form”. Furthermore, N and K increased alpha-pinene, whereas P enhanced it only in “Majorka pink”. In both the cultivars, N enhanced linalool, camphene and myrcene, P enhanced limonene, K enhanced p-cymene and reduced 1,8-cineole. The essential oil production per kg of fresh weight was not affected by fertilization. In “Majorka pink” the fertilization with N, P and K increased the number of capitate glandular trichomes in comparison with the control. Non-glandular hairs were scattered in “Majorka pink”, whereas they formed a dense covering in “Montfort form”, obscuring the epidermal surface
La concimazione del rosmarino
Full text linkNell’accertare le asportazioni di azoto, fosforo e potassio, si osserva che la concimazione influenzerebbe la qualità dell’olio essenziale
Floating system senza ossigenazione per la produzione di ortaggi da IV gamma
No full textGli ortaggi da quarta gamma hanno riscontrato un grande successo commerciale imponendosi sugli scaffali della grande distribuzione fino a coprire percentuali ragguardevoli nella vendita dei prodotti freschi. In Belgio si stima che il 50% della frutta e della verdura acquistate al dettaglio siano di quarta gamma mentre in Lombardia, nella grande distribuzione, rappresentano già circa il 15%. Questi prodotti si adattano bene alle attuali esigenze di un consumatore che ha sempre minore disponibilità di tempo da dedicare alla spesa domestica ed alla preparazione di alimenti (mondatura, lavaggio, asciugatura). Uno dei parametri più importanti per la commercializzazione di questi prodotti è la qualità sanitaria, ossia i prodotti devono essere “puliti”, con bassa carica microbica. Per facilitare l’ottenimento di questo tipo di produzione sono in corso di sperimentazione sistemi di produzione fuori suolo. Purtroppo la coltivazione con questi sistemi è, almeno inizialmente, più costosa di quella effettuata in pieno campo, soprattutto per il costo delle strutture e delle infrastrutture annesse. L’obiettivo di questo lavoro è stato quello di valutare la produzione di valerianella in floating system, con o senza un impianto di ossigenazione, in modo da semplificare l'impianto senza compromettere la produzione in termini quali-quantitativi
Effetto della temperatura sulla conservazione della valerianella da IV gamma
No full textThe quality of minimally processed leafy vegetables is defined by the visual appearance and internal phytonutrient contents. The visual appearance depends on the chlorophyll content and other leaf pigments, while the phytonutrients include anthocyans, polyphenols and carotenoids. During the distribution chain the correct storage temperature can preserve for relatively long time the internal and external quality of minimally processed leafy vegetables. The aim of this work was to investigate the effect of two storage temperatures (4 and 10°C) on the quality of lamb’s lettuce (Valerianella olitoria L. Valerianella locusta ). Plants of the cv ‘Trofy’ were grown in floating system with the following nutrient solution concentration (expressed in mM): 13 N-NO3; 1.5 P; 3.5 Ca; 1.7 Mg; 9.5 Na; 8.0 Cl; 2.7 S; 0.04 Fe and micronutrients. The leaves were harvested at commercial maturity stage and minimally processed (washed, dried, graded). Then, they were packed in commercial plastic boxes and stored at 4 or 10°C. The effect of temperature was evaluated measuring the chlorophyll content and the variations of antioxidant compounds such as anthocyans, phenols and carotenoids. The anthocyans did not change in both storage temperatures, while the phenol content significantly decreased in leaves stored at 10°C after 8 days of storage. Total carotenoids, instead, decreased at both storage temperatures, but with different degradation rates
Poinsettia in vaso, l'influenza della tecnica di irrigazione
No full textDrip irrigation, with or without recycling of the drainage solution, and subirrigation (flux and reflux) were compared for their effect on pot-grown poinsettia (Euphorbia pulcherrima cv. Cortez). The closed systems eliminated runoff and resulted in increased efficiency of water and nutrient use without impairing plant growth and characteristics. The composition of the re-circulating solution changed slightly but there was no need to replace it. Subirrigation had no effect on the plant-substrate interaction but resulted in a higher accumulation of salts in the substrate than with drip irrigation
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
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