1,721,015 research outputs found
Attuali conoscenze degli Eriofioidei vettori di Virus.
No full textOnly a small number of diseases have been confirmed to be caused by virus species transmitted by eriophyid mites; many others have uncertain aetiology and the involvement of a virus is suspected. Many eriophyid species produce symptoms which may be confused with viral diseases or hide virus infections not identified yet. The development of biotechnologies and their continuous updating and improvements could allow a larger detection of virus entities. The purpose of the present review is to describe the current state of knowledge on the eriophyid and plant virus interactions pointing out the weak points of these investigations
Resveratrol and the Pharmacology of Aging: A New Vertebrate Model to Validate an Old Molecule
No full textMorphological and molecular characterization of the Colomerus vitis erineum strain (Trombidiformes: Eriophyidae) from grapevine erinea and buds
Full text linkThe grapevine erineum mite strain (GEM) of Colomerus vitis (Pagenstecher) has spread throughout the main viticultural areas worldwide and was recently demonstrated to be a vector of Grapevine pinot gris virus (GPGV) and Grapevine inner necrosis virus (GINV). Its females mainly overwinter under the outer bud scales as winter morphs (deutogynes). Goals of this study were to characterize the morphology of protogynes (spring–summer morphs) and deutogynes (winter morphs), to confirm their genetic similarity, and to establish the seasonal period of the deutogyne occurrence. Buds or leaves from a single vineyard (cv. Luisa), Bari area, Apulia, Italy, infested with GEM were sampled 6 × from December 2015 to January 2017. Sixty-six traits commonly used for taxonomic identification were analysed on females. The length of the tibial setae l′ on leg I and the tarsal setae ft′ on leg II, as well as the number of smooth dorsal semiannuli differed significantly between protogynes and deutogynes, and were easier to detect than other significantly distinctive traits. ITS1 was investigated in individuals collected from buds and erinea, and the sequences confirmed that these two morphs have identical ITS1 fragments. The 1-year study demonstrated the simultaneous presence of protogynes and deutogynes in July and September 2016, whereas only protogynes were found in April and May 2016, and only deutogynes in December 2015 and January 2017
Colomerus vitis (Acari: Trombidiformes: Eriophyoidea): some morphometric, biomolecular and biological aspects comparing deutogyne versus protogyne forms.
Full text linkEriophyoid mites overwinter by a winter form (deutogyne) morphologically distinct from the spring-summer form (protogyne). Deutogyne is well distinct and known for a part of eriophyoids. Grapevine erineum mite, Colomerus vitis (Pagenstecher), is widespread in the main world viticultural areas, was recently demonstrated vector Grapevine pinot gris virus. Its females overwinter mainly under outer scales of buds and a deutogyne was described but not perfectly distinct from the protogyne.
A morphometric, biomolecular and biological approach was applied in order to better characterize deutogynes versus protogynes. Buds or leaves of Luisa infested by C. vitis were sampled 6 times from the same vineyard between December 2015 and January 2017. Females were studied for about 70 traits commonly used for taxonomic identification. Kruskal-Wallis test was applied for the measured populations. ITS1 was investigated in individuals collected from buds (winter) and erinea (spring). Groups of protogynes and deutogynes were separately submerged in water or vaseline, at 5/25±1°C, and mite survival was assessed every week/day, respectively. Data were analyzed by regression analysis.
Length of foreleg seta l’ and hindleg seta ft’, and numbers of smooth dorsal semiannuli were significantly different between protogynes and deutogynes. ITS1 analysis confirmed the homogeneity of these populations. The study demonstrated the presence of population composed by protogynes and deutogynes in July and September 2016. In April and May 2016 were collected only protogynes, whereas in December 2015 and January 2017 were collected only deutogynes, as expected. Deutogynes showed a higher survival than the protogynes in all experimental conditions
Morphological and molecular characterization of the Colomerus vitis erineum strain (Trombidiformes: Eriophyidae) from grapevine erinea and buds
No full textThe grapevine erineum mite strain (GEM) of Colomerus vitis (Pagenstecher) has spread throughout the main viticultural areas worldwide and was recently demonstrated to be a vector of Grapevine pinot gris virus (GPGV) and Grapevine inner necrosis virus (GINV). Its females mainly overwinter under the outer bud scales as winter morphs (deutogynes). Goals of this study were to characterize the morphology of protogynes (spring–summer morphs) and deutogynes (winter morphs), to confirm their genetic similarity, and to establish the seasonal period of the deutogyne occurrence. Buds or leaves from a single vineyard (cv. Luisa), Bari area, Apulia, Italy, infested with GEM were sampled 6 × from December 2015 to January 2017. Sixty-six traits commonly used for taxonomic identification were analysed on females. The length of the tibial setae l′ on leg I and the tarsal setae ft′ on leg II, as well as the number of smooth dorsal semiannuli differed significantly between protogynes and deutogynes, and were easier to detect than other significantly distinctive traits. ITS1 was investigated in individuals collected from buds and erinea, and the sequences confirmed that these two morphs have identical ITS1 fragments. The 1-year study demonstrated the simultaneous presence of protogynes and deutogynes in July and September 2016, whereas only protogynes were found in April and May 2016, and only deutogynes in December 2015 and January 2017
Resveratrol prevents age-dependent motor and cognitive decline and prolongs life span in a short-lived vertebrate
No full text
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
- …
