1,721,000 research outputs found
Pollenizer and Cultivar Influence Seed Number and Fruit Characteristics in Olea europaea L.
Full text linkThe effect of several pollination combinations of the olive cultivars Ascolana Tenera, Carolea, Leccino, and Picholine on seed quality and seed number and drupe and seed features were evaluated in 2007 and in 2008 in central Italy. The well-known pattern in olive fruit was confirmed by the high percentage of drupes (71.8%, on average) containing one seed with a closed endocarp, as the dispersal unit, optimizing the plant's investment in seedling survival. Based on the results of the x2 test of independence, there was a significant maternal and paternal effect on the number of normal seeds per drupe in some years and combinations. Particularly, in 2007, Picholine and Leccino cultivars (as mother) had drupes with two normal seeds (23.7% and 3.1%, respectively, with respect to 10.8% observed in a normal seed pattern), confirming that double-seeding in olive could be cultivar-dependent. Also the specific crosspollination between 'Carolea', as a pollenizer, and 'Ascolana Tenera' gave rise to a higher proportion of double-seeded drupes in 2007 (39% with respect to 14.3% expected to be in this category). In 2008, although 'Ascolana Tenera' produced more drupes with undeveloped seeds (31.9% with respect to 19.7% expected to be in that category), 'Leccino' and 'Carolea' had drupes with a lower number of undeveloped seed (14.2% and 11.5%, respectively). 'Maurino' and 'Ascolana Tenera' pollen produced significant effects on 'Leccino' drupes by increasing the number of drupes with undeveloped seeds in both experimental years. Double-seeded drupes outweighed those with only one normal seed in 'Leccino' and 'Picholine'. Instead, drupes with undeveloped seeds affected fruit weight, being generally lighter than those with normal seeds. Although the Leccino cultivar, combined with 'Maurino' and 'Ascolana Tenera', greatly increased the proportion of drupes without normal seed, such condition did not affect their final weight, which was not different from those with one normal seed, suggesting that this variety caused late seed death.Fil: Farinelli, Daniela. Università di Perugia; ItaliaFil: Pierantozzi, Pierluigi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Palese, Assunta Maria. Universita` Degli Studi Della Basilicata; Itali
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
Esigenze Minerali e Tecniche di Concimazione - Collana divulgativa dell’Accademia
No full textThe productive performance of an olive orchard is strongly affected by the olive grower capacity in choosing, combining, and properly performing the several agronomical practices, such as fertilization, soil management, irrigation, also taking into account their environmental impact. On the other hand, such expertise is taken into consideration by the recent agricultural European Union policy which supports and encourages the use of production technologies aimed to preserve natural resources. Among agronomical practices, fertilization can induce a ready and effective vegetative-productive response in olive tree. A well balanced and appropriate fertilization should take into account some steady points: real nutrient needs of olive trees along the different stages of plant life cycle; soil nutrient availability and tree nutritional status; synchronization between nutrient requirements by the plants (olive trees
and, in case, cover crops) and their availability in soil volume where roots are present; fertilization techniques and their efficiency; soil management techniques (spontaneous or seeded cover crops, recycling of pruning material within the orchard, use of manure or compost) and water availability linked to natural conditions (rainfall) or irrigation practice. In the present report some practical suggestions for an appropriate mineral and organic fertilization are reported taking into account the different farm management system
Realizzazione di un sistema di compostaggio on farm dei residui di pomodoro
No full textSono riportati i primi risultati di una sperimentazione
su tecniche compostaggio per il riciclo aziendale nel
suolo dei residui colturali con scarse destinazioni alternative
(es. alimentazione zootecnica). E’ stata
adottata la tecnologia di compostaggio semplificata
del cumulo statico ad insufflazione attiva dell’aria
con soffiante ad alimentazione elettrica e tubi forati.
Il processo di compostaggio ha interessato 4 differenti
cumuli ottenuti dalla miscelazione di: cippato (materiale
strutturante); compost commerciale (innesco);
residui di piante di pomodoro e IV gamma. Nei 4 cumuli,
il pomodoro ha costituito il 50 %, il 37,5 %, il
25 % e il 17,5 % in peso secco, rispettivamente. In
tutti i cumuli il rapporto C/N di partenza è stato pari
a 30. Quali indicatori della maturità del compost ottenuto
sono stati utilizzati la respirazione basale e
l’attività idrolasica totale. La stabilità del prodotto finale
è stata valutata su quattro diverse specie orticole
(Solanum lycopersicon, Lactuca sativa, Triticum
aestivum e Lepidium sativum) tramite il test di fitotossicità
degli estratti acquosi dei compost. Le analisi
microbiologiche condotte sono state relative alla
carica batterica totale, alla densità di pseudomonadi e
di batteri termoresistenti e al numero di funghi totali.
Inoltre, è stato determinato il pH e l’EC, nonchè l’azoto
totale, i nitrati, il potassio, il fosforo, il calcio, il
magnesio e il sodio del prodotto finito. Infine, è stata
valutata la presenza di metalli pesanti. I residui di
pomodoro si sono rilevati idonei alla produzione in
azienda, in tempi brevi (circa un mese), di un compost
vegetale di buona qualità. Anche una prima analisi
economica del sistema di compostaggio proposto indica
la compatibilità economica, oltre che la sostenibilità
ambientale, della tecnologia on-farm sperimentata
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