1,720,975 research outputs found
La coltivazione del riso in regime biologico: i risultati della sperimentazione 2012
No full textWithin the frame of an experimental project on organic farming, cultivation trials were performed to characterize
rice varietal response on farms with expertise in rice organic farming cultivation. Selected varieties included recently
developed and traditional ones belonging to all different merceological classes. For the round rice group, the varieties
were Brio, Cerere, Ducato and Selenio. For the long A group, varieties were chosen according to their end use: Loto
and Opale, utilized for the production of parboiled rice while Ulisse, Meco and Volano for the national market. For
the long B group Arsenal, Ellebi and Salvo were tested. The experimentation revealed an average yield of about 6 t/
ha, therefore lower than those recorded under conventional farming conditions. The highest yield was observed in
Mede Lomellina (Pv) with Brio, Opale and Meco, being the best performing varieties with about 7 t/ha, while in
Valle Lomellina (PV) average yield was lower (5,9 t/ha) and the varieties with highest yield were Loto, Opale, Ulisse
(about 6,5 t/ha) and finally Selenio with about 8 t/ha. Considering also the availability of data derived from the
experimentation of the previous years, data highlighted that within the round group the varieties Brio and Selenio
were the most adaptable ones to organic farming conditions. Within the long A group, Opale for parboiled rice, and
Volano for national market demonstrated to provide good yield levels for the 3 years although the cultivar Volano had
serious lodging, while within the long B group, Ellebi was the best performing considering the three years of trials and
Arsenal showed good yield and high amylose content
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
Ottimizzazione del protocollo di micropropagazione per l'Elicrysum Italicum (Roth) G. Don
No full textGlands, essential oils and in vitro establishment of Helichrysum italicum (Roth) G. Don ssp. microphyllum (Willd.) Nyman
No full textIn this work, two Helichrysum italicum (Roth) G. Don ssp. microphyllum (Willd.) Nym. genotypes (genotype 1 and genotype 12) collected from different areas of Corsica were used. After the taxonomic identification based on several specific morphological characters, the two genotypes were, subjected to microscopic studies. The precise structure of the glandular trichomes, secreting essential Oils, on the flower heads and leaves of H. italicum (Roth) G. Don ssp. microphyllum Willd.) Nym. are described here for the first time. Volatile constituents from both field-grown genotypes 1 and 12 were analyzed and their composition compared: monoterpenes were the most abundant class of compounds with nerol and its esters as the main metabolites. Genotype 12 was used to establish an efficient micropropagation protocol. For proliferation, different concentrations of 6-benzylaminopurine (BAP) alone or in combination with indole-3-butyric acid (IBA) were tested adding sucrose (20% or 30%). To define the optimal conditions for in vitro rooting, the shoots obtained were divided and transferred to the culture medium without growth regulators or enriched by different auxins in combination with sucrose (20% or 30%). Acclimatization, carried out in different conditions was easy, registering high survival percentages. The results achieved in this study allowed to obtain selected and standardized plants suitable for the exploitation in industrial sectors of this interesting species
Mantenimento in vitro di 20 chemiotipi di Helichrysum italicum (Roth) G. Don ssp. italicum
No full textScegliere le varietà di riso in base alla stabilità produttiva
No full textÈ stata condotta una verifica sulle differenze nella adattabilità ambientale per i dati produttivi e di performance agronomica e qualitativa per 15 varietà di riso. Per i parametri produzione e resa in grani interi, l’indagine ha evidenziato un sostanziale trend positivo ed ha consentito di identificare varietà delle classi Lungo A e Lungo B che mantengono buone prestazioni in diversi ambienti (diversi anni e località). Anche per il mal del collo e il brusone fogliare sono state identificate varietà che forniscono buoni livelli di protezione quando analizzate nel medio periodo. Nel complesso l’analisi denota comunque la necessità di indirizzare il miglioramento genetico verso l’ottenimento di piante dotate di più efficace adattamento alla variazione ambientale
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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