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Influenza della salinità dell’acqua di irrigazione su alcuni aspetti fisiologici della patata (Solanum Tuberosum L.).
No full textThe relationship between the gamma glutamyl transpeptidase and Hg levels in Se/Hg antagonism in mouse liver and kidney
No full textThe gamma-glutamyl transpeptidase (gamma-GT) activity and Hg concentrations were studied in Se/Hg antagonism in mouse liver and kidney after treatment with methyl mercury (MM) (1~MM group) and MM+sodium selenite (SE) (SM group). In acute treatment (dietary doses: MM = 250 p.p.m.; SE = 90 p.p.m.; length of treatment 11 days), hepatic gamma-GT activity increased in both protected and unprotected animals with respect to controls and reached a peak after 3 days with respect to controls, its value being relatively greater in the MM group. On the contrary, renal gamma-GT decreased with time with respect to controls and was higher in the SM group at 3 and 7 days. Liver and kidney accumulation of Hg increased and decreased respectively with time, and was higher in SM groups in most cases. In chronic treatment (dietary doses: MM =12 · 5 p.p.m.; SE = 9 p.p.m.; length of treatment 12 months) hepatic gamma-GT activity in the MM group was higher than in the SM group at 1 · 5 and 7 months, whereas the renal activity was lower at 7 months and unchanged at 1 · 5 and 12 months. In comparison with the acute treatment, the trend of Hg accumulation was similar in liver and different in kidney; Hg concentrations of the SM group were always greater than those of the MM group. Glutathione (GSH) in liver and non-protein SH groups (NPSH) in kidney were also measured in acutely treated animals. On the first day GSH was about 50% of the control value in both the MM and SM groups; it subsequently remained constant in the MM group, but increased to a peak at 7 days, without reaching the control value, in the SM group. Unlike in the liver, renal NPSH increased in both groups on the first day, and then decreased with time without reaching the control value, SM group values always exceeding those of the MM group. The modulation of gamma-GT activity in liver and kidney caused by SE suggests that the enzyme plays a role in Hg accumulation. © 1990 The Italian Pharmacological Society
Modulation of activity of glutathione dependent enzymes caused by dietary methylmercury and selenium treatment in various organs of mouse
No full textAdenylate deaminase (5’-adenylic acid deaminase, AMPDA)- catalyzed deamination of 5’-deoxy-5’-substituted and 5’-protected adenisines: a comparison with catalytic activity of adenosine deaminase (ADA)
No full textLipase-catalyzed selective benzoylation of 1,2 diols with vinyl benzoate as acyl transfer agent in an organic solvent
No full textClemmensen reduction of diosgenin and kryptogenin: synthesis of [16,16,22,22,23,23-H-2(6)]-(25R)-26-hydroxycholesterol
No full textSynthesis of deuterated isotopomers of 7α and (25R,S)-26-hydroxycholesterol, internal standards for in vivo determination of the two biosynthetic pathway of bile acids
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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
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
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