1,721,617 research outputs found
Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
No full textStocchino, G. A., Corso, G., Manconi, R., Casu, S., Pala, M. (2005): Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus. Journal of Natural History 39 (22): 1947-1960, DOI: 10.1080/00222930500060025, URL: http://dx.doi.org/10.1080/0022293050006002
Il demanio marittimo nella teoria dei beni pubblici. Pianificazione, concorrenza e valorizzazione alla “prova” del diritto unionale
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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
THE ROLE OF THE ARABIDOPSIS THALIANA ATYPICAL KINASES ABC1K2 AND ABC1K9 IN STRESS RESPONSES
No full textThe ABC1K protein kinases (activity of bc1 complex kinases) are a large family of proteins with multiple roles in the regulation of respiration and oxidative stress tolerance. In plants they regulate diverse physiological processes in the chloroplasts and mitochondria, but their precise functions are poorly defined. In this work the functional characterization of the chloroplast Arabidopsis thaliana ABC1K2 and ABC1K9 proteins is carried out. To characterize the function of the two proteins, A. thaliana knock-out mutant lines that lack ABC1K2 or ABC1K9 proteins are considered. Under standard growth conditions, abc1k2 and abc1k9 mutant plants do not show morphological or developmental abnormalities if compared to wild type. Pigment analysis reveals a reduced total chlorophyll content and Chla/b ratio in abc1k2 and abc1k9 old leaves. Analysis of ultrathin sections of leaves with transmission electron microscopy does not show any significant difference in the chloroplast ultrastructure between wild type and mutant plants. Interestingly, in abc1k2 and abc1k9 plants plastoglobules with a reduced diameter are associated with thylakoids. Analysis of the photosynthetic performance demonstrates no differences in the major photosynthetic parameters between wild type and mutant plants. Since other ABC1K proteins are involved in plant response to oxidative stress, the effect of oxidative stress on abc1k2 and abc1k9 mutant plants is considered. When plants were grown in the presence of hydrogen peroxide, both abc1k2 and abc1k9 mutants show an increased root length in comparison to wild type. Transcription levels of SOD genes and APX1 are down-regulated in abc1k2 mutant, while they result up-regulated in abc1k9. The level of superoxide anion radical staining is more evident in wild type plants than in abc1k2 and abc1k9 mutants. Because reactive oxygen species take part in ABAmediated processes, the functions of ABC1K2 and ABC1K9 during germination are investigated. Germination is more severely affected by ABA, osmotic stress and salt stress in abc1k2 and abc1k9 mutants. These results suggest that ABC1K2 and ABC1K9 might be involved in the cross-talk between ABA and ROS signallin
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