1,720,965 research outputs found
Improvement of Citrus clementina Hort. ex Tan. microspore-derived embryoid induction and regeneration
No full textAn improvement of the protocol for haploid induction through anther culture of Citrus clementina Hort. ex Tan. cv. Nules was achieved following the evaluation of a number of the factors affecting androgenesis. The influence of thidiazuron (TDZ) and three temperature pre-treatments (4°C, 25°C, 32°C) on the floral buds with respect to anther culture of C. clementina Hort. ex Tan., cv. Nules was investigated. An increased embryoid production was induced in the medium supplemented with TDZ. Pre-treatment temperatures of 4°C and 25°C were more favorable for embryo production than 32°C. Regeneration of androgenic haploid plantlets from cv. SRA 63 of C. clementina is reported here for the first time
In vitro germination and seedling development of caper (Capparis spinosa L.) mature seeds
No full textCapparis spinosa L. (Capparidaceae) is a perennial tropical and subtropical shrub plant known worldwide. Despite the increasing demand and economic importance of capers, little information is available regarding the propagation of this shrub. In fact, it is usually propagated by seed, but its percentage of germination is very low. In this report, in vitro seed germination and seedling development of Capparis spinosa L. were studied and several treatments were evaluated to determine the ability of several factors to increase the percentage of germination. High variability was observed among the germination percentages of the different treatments (3-81%) due to their different efficiency to break dormancy. Scarification through seed coat rupture has been determinant to improve germination percentage. In vitro obtained seedlings were valuable to establish a micropropagation protocol for caper
In vitro establishment and culture of two Sicilian cultivars of Olea europaea L
No full textSicily is among the Italian regions with the largest cultivation area of olive (Olea europaea L.). The applications of in vitro tissue culture, as practical tool of propagation and germplasm storage, were not sufficiently exploited in this species, because of the lack of efficient in vitro establishment protocols and culture for the majority of the cultivars. In fact, it is well known that the success of in vitro culture is strongly dependent on the species and, within the species, on the cultivars. This study reports the in vitro establishment of two Sicilian olive cultivars, grown in greenhouse. Both genotypes showed a percentage of in vitro sprouting higher than that one previously obtained with explants collected from mature plants grown in open field. The collection time was not determinant on in vitro response
Free and conjugated polyamine content in Citrus sinensis Osbeck, cultivar Brasiliano N.L.92, a Navel orange, at different maturation stages
Full text linkBiogenic amines, synthesized during physiological metabolic processes of all living organisms, are present in food. At low
concentrations, polyamines are essential for cell renewal and growth, but they can be detrimental when consumed in high amount
through the diet as they could support abnormal cell growth pathologies. The daily human diet contains more putrescine than
spermidine or spermine, mostly derived from fruits. In general, orange fruits contain high levels of put, a fact that could limit their
utilization in the daily diet besides the benefits contributed by their strong antioxidant properties. There is therefore an increasing
interest in finding plant foods with low polyamine contents, which could provide a staple diet for patients. This paper reports the
amounts of free and conjugated polyamines in the flesh and peel (flavedo plus albedo) of unripe, ripe and over ripe fruits of the
cultivar Brasiliano, a Navel group orange. The analyses reveal that this particular orange cultivar has low polyamine content and
could be suitable for a low polyamine diet
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
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