1,720,959 research outputs found
Comparison of nut traits and quality evaluation of chestnut (Castanea sativa Mill.) germplasm in Latium Region (Central Italy)
No full textThis study was aimed at improving a sustainable development of fruit production through the exploitation of local chestnut germplasm in three areas of Latium region: Allumiere and Cave, where chestnut is marginally cultivated, and Monti Cimini, where chestnut production has a national interest. The present state of chestnut cultivation has been examined. Nut traits and seed composition of local ecotypes have been compared with those of cultivars of different geographic origin grown in a collection field in Caprarola. Quantitative and qualitative analysis of soluble sugars and organic acids and content of moisture, starch, lipids and protein in the seed and total phenols in the pellicle were determined. The local cultivars of Allumiere have shown small fruits in comparison with varieties of Monti Cimini. On the basis of nut traits, the ecotypes collected in Allumiere belong to the types of “Marrone” and “Castagna”. Variability of seed composition was observed, particularly for polyphenols, starch and soluble sugars. Fruits of “Castagna” type have shown a higher average content of starch in comparison with nuts of “Marrone”. The main soluble sugar in all cultivars was sucrose that represents about 80% of the total soluble sugars. “Primotico” ecotype, located in the Monti Cimini district, has shown the highest content of sugars (25mg 100mg-1 dw) in comparison whit the nuts of other local cultivars. In general, “Marrone” type has shown a higher content of crude proteins than “Castagna” cvs. In conclusion, the results suggest the good quality of local germplasm and the opportunity of its utilization to improve a sustainable developement of chestnut cultivation in tipical districts of Latium region
Isolation of triploid and tetraploid olive (Olea europaea L.) plants from mixoploid cv 'Frantoio' and 'Leccino' mutants by in vivo and in vitro selection.
No full textThis paper reports a procedure for isolating triploid and tetraploid olive plants, which have not been produced before either artificially or in nature. These polyploids were isolated from two mixoploid somatic mutants obtained earlier by treating 'Frantoio' and 'Leccino' plantlets with gamma radiation. The mixoploid mutants exhibit increased thickness-of leaf, stem and root tissues, short internodes, a modified leaf lamina shape and a strong resistance to Spilocaea oleagina (Cast.) Hugh. In addition, they produce a mixture of normal drupes and some abnormally large ones, almost twice normal size. The variation in the nuclear DNA content of the mixoploid mutants is closely correlated with variation in their pollen size, crop capacity and the production of large fruit. Triploid genotypes with 69 chromosomes were isolated by germinating the seeds of these large fruits, collected from both the mixoploid mutants. Tetraploid plantlets, with 92 chromosomes, were obtained from cv. 'Frantoio' by selecting in vitro, during several proliferation phases, the shoots with obvate leaf shape which occurred among the shoots with normal lanceolate or intermediate leaf shape
Influenza della posizione dei grappoli nella chioma su alcune caratteristiche anatomiche e sul comportamento degli acini durante la disidratazione postraccolta in ambiente controllato
No full textLe tecniche agronomiche in uso nel vigneto influenzano importanti caratteristiche morfo-anatomiche e compositive dell’acino, in grado a loro volta di condizionare il processo di appassimento controllato delle uve. Le caratteristiche dello strato cuticolare della bacca possono essere condizionate dalla posizione del grappolo nella chioma durante il periodo di maturazione. Sulle varietà Rossetto e Procanico sono state effettuate prove per verificare le variazioni del contenuto di cere epicuticolari in acini appartenenti a grappoli intra ed extra-chioma e valutare nei medesimi grappoli l’andamento del processo di disidratazione controllato. Sulla base dei dati ottenuti si è osservato nel corso della maturazione una tendenza alla diminuzione del quantitativo di cere epicuticolari, in particolare nei grappoli intrachioma dei due vitigni. Nelle uve in appassimento l’applicazione dell’Analisi delle Componenti Principali (PCA) alle misure spettroscopiche, effettuate mediante un AOTF-NIR, ha fornito una significativa discriminazione dei campioni relativi ai vari stadi di disidratazione in entrambe le varietà
Efficacia di acidi organici biologici microincapsulati nel controllo di Pseudomonas syringae pv. tomato.
No full textI batteri fitopatogeni del pomodoro sono un problema sia per le coltivazioni in serra che in pieno campo; tra quelli in grado di causare i danni maggiori c’è Pseudomonas syringae pv. tomato, Pst, (Okabe) Young et al., agente causale della picchiettatura batterica del pomodoro. Considerata la scarsità di formulati alternativi al rame, la ricerca scientifica si è indirizzata verso l’individuazione di sostanze naturali con particolare attività antimicrobica. Lo scopo del presente lavoro è stato quello di valutare in serra l’efficacia di due microincapsulati nel controllo di Pseudomonas syringae pv. tomato (Pst) a base di acido gallico al 10% ed a base di acido gallico ed acido ellagico (entrambi al 2%). Le prove sono state effettuate in serra su piante di pomodoro, cv. Pullrex Bio, contaminate con una sospensione batterica di Pst (105 ufc/ml). I trattamenti fogliari con i microincapsulati sono stati effettuati 24 ore prima della contaminazione con il patogeno; dopo 1, 7 e 14 giorni dalla stessa, venivano effettuati i campionamenti e le analisi specifiche allo scopo di stimare i valori della popolazione batterica di Pst presente sul filloplano delle piante. Dai risultati ottenuti è emerso che entrambi i formulati impiegati sono risultati in grado di ridurre significativamente nel tempo la popolazione epifitica di Pst. In particolare, nelle tesi trattate con il microincapsulato contenente acido gallico al 10%, i valori di P. s. pv. tomato, venivano ridotti similarmente ai livelli registrati nelle tesi sottoposte all’impiego del composto rameico (ossicloruro di rame al 27%)
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
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
- …
