322,819 research outputs found
Ozone tolerance in Phaseolus vulgaris depends on more than one mechanism
No full textTwo bean cultivars with different ozone-sensitivity, i.e. the O3-sensitive Cannellino and the O3-tolerant Top Crop, were exposed to acute O3-stress with the aim of evaluating physiological and biochemical traits responsible for O3-tolerance. The cultivars differed in their constitutive ability to prevent and counter O3-induced oxidative damage. The ability to dissipate excess-energy, via regulated and unregulated nonphotochemical quenching mechanisms (NPQ, NO) was constitutively greater in Top Crop than in Cannellino, and allowed the O3-tolerant cultivar to compensate light-induced declines in PSII and preserve photosystem II from excitation-energy to a superior degree than the O3-sensitive one. The inevitable generation of reactive oxygen species was countered to a significantly smaller extent in the O3-sensitive cultivar, because of constitutively lower activities of superoxide dismutase and catalase than the O3-tolerant cultivar. Indeed, Cannellino underwent an early accumulation of H2O2 and an almost complete disruption of cell structure and irreversible damages in the photosynthetic apparatus
Studio della fluorescenza della clorofilla a e dell’immagine della fluorescenza in due varietà di Lycopersicon esculentum sottoposte ad un singolo pulse di ozono
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L’impiego di un collare elettronico per inibire l’aggressività in uno stallone da riproduzione
No full textDirectional Freezing (Harmony Cryocare – Multi Thermal Gradient 516*): a New Tool for Equine Semen Cryopreservation
No full textInfluence of Kiwifruit Canopy Position on Fruit Quality
No full textThe influence of canopy position on several kiwifruit quality attributes was evaluated. The experiment was conducted on fruit from a commercial kiwifruit orchard (Actinidia deliciosa 'Hayward') located at Rigoli (Pisa, Italy), in 2004 growing season, where vines were trained as a free palmette. Fruit were harvested from four different positions of the canopy; the positions (external- and internal- top, external- and internal- bottom) were characterized by a different quantity of daily intercepted solar radiation. At harvest some fruit quality attributes were measured (i.e., weight, soluble solids content and flesh firmness) and fruit analysed for ascorbic acid and chlorophylls content. Canopy position markedly influenced some of the quality attributes studied, particularly fruit ascorbic acid content
The clinical significance of the POLG gene polymorphism in male infertility.
No full textBased on association studies, an increasing number of gene polymorphisms have been proposed as modulators of spermatogenesis. Interestingly, a clear cause-effect relationship between a polymorphism of the POLG gene and oligo(astheno)zoospermia was recently described. The POLG gene contains a polymorphic CAG repeat, and the presence of a homozygous mutant (not10/not10 CAG) genotype was found only in infertile men. In the present study, a large number of infertile patients and normospermic men of Italian origin were studied to define the effect of POLG genotypes on spermatogenic potential and whether the homozygous mutant is specific for spermatogenic disturbances. The mutated genotype was found at the same frequency in both infertile and normospermic men. Mean values of sperm parameters such as sperm count, motility, and morphology did not differ significantly between carriers of the three different genotypes. Our study failed to confirm any influence of the POLG gene polymorphism on the efficiency of the spermatogenesis. More importantly, considering that the homozygous mutant genotype has been found in normospermic fertile men, the analysis of the CAG repeat tract of the POLG gene does not appear to have any clinical diagnostic value
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
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