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Search Results: 1 - 10 of 568 matches for " LM.;Urbinati "
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Leukocytes respiratory burst and lysozyme level in pacu (Piaractus mesopotamicus Holmberg, 1887)
Abreu, JS.;Marzocchi-Machado, CM.;Urbaczek, AC.;Fonseca, LM.;Urbinati, EC.;
Brazilian Journal of Biology , 2009, DOI: 10.1590/S1519-69842009000500018
Abstract: innate immune responses are useful to determine the health status of fish and to evaluate the effect of immunomodulatory substances in fish farming. leukocytes respiratory burst was measured in pacu (piaractus mesopotamicus) using chemiluminescence assay and nitroblue tetrazolium (nbt) reduction assay. the nitroblue tetrazolium reduction seemed more adequate than chemiluminescence assay for leukocytes oxidative burst determination, since it was difficult to isolate the blood leucocytes for chemiluminescence assay. plasma and serum lysozyme were measured using a turbidimetric assay. the heating of serum and plasma samples (56 oc for 30 minutes) for complement system inactivation darkened the plasma samples and interfered in the results. the lysozyme activity in serum was higher than in plasma, suggesting that serum samples are more appropriate for the analysis. this study established protocols that can be useful tools in the study of immune mechanisms of the tropical fish pacu.
O que torna a representa??o democrática?
Urbinati, Nadia;
Lua Nova: Revista de Cultura e Política , 2006, DOI: 10.1590/S0102-64452006000200007
Abstract: the author, following the steps of bernard manin and others, but presenting her own insights, discusses the nature of democratic representation, standing for its originality as a type of representative government. her main theoretical point is to single out the distinctive features of that type from both the "electoral democracy" as well as the "direct democracy".
Divisorial models of normal varieties
Stefano Urbinati
Mathematics , 2012,
Abstract: We prove that the canonical ring of a canonical variety in the sense of de Fernex and Hacon is finitely generated. We prove that canonical varieties are klt if and only if R(-K_X) is finitely generated. We introduce a notion of nefness for non-Q-Gorenstein varieties and study some of its properties. We then focus on these properties for non-Q-Gorenstein toric varieties.
A note on the ampleness of non-integral divisors
Stefano Urbinati
Mathematics , 2015,
Abstract: We investigate which of the characterizations of integral ample divisors can be extended to $\mathbb{Q}$-divisors and $\mathbb{R}$-divisors when associating to the Weil divisor the line bundle of its integral part.
Discrepancies of non-$\Q$-Gorenstein varieties
Stefano Urbinati
Mathematics , 2010,
Abstract: We give an example of a non $\Q$-Gorenstein variety which is canonical but not klt, and whose canonical divisor has an irrational valuation. We also give an example of an irrational jumping number and we prove that there are no accumulation points for the jumping numbers of normal non-$\Q$-Gorenstein varieties with isolated singularities.
Influence of food restriction on the reproduction and larval performance of matrinx?, Brycon amazonicus (Spix and Agassiz, 1829)
Camargo, ACS.;Urbinati, EC.;
Brazilian Journal of Biology , 2008, DOI: 10.1590/S1519-69842008000400024
Abstract: this work evaluated the effect of food restriction and refeeding of matrinx? females, brycon amazonicus, on their reproductive performance and on the growth and survival of the progeny. broodstocks were distributed in 8 earthen tanks (15 fish/tank) and fish from 4 tanks were fed daily (g1) while fish from the other 4 tanks were fed for 3 days and not fed for 2 days (g2) during 6 months prior to artificial spawning. among the induced females, 57% in g1 group and 45% in g2 group spawned and the mean egg weights were 208.1 g (g1) and 131.6 g (g2). oocytes of g2 fish were smaller (1.017 ± 0.003 mm) than oocytes of g1 fish (1.048 ± 0.002 mm). fertilization (71.91 ± 12.6% and 61.18 ± 13.7%) and hatching (61.28 ± 33.9% and 67.50 ± 23.4%) rates did not differ between g1 and g2 fish. larvae were collected at hatching and at 24, 48 and 72 hours of incubation and fixed for growth measurement. after incubation, fry were transferred to aquaria and sampled 1, 5, 9 and 15 days later. g1 and g2 larvae had similar weight (1.51 ± 0.15 and 1.46 ± 0.07 mg) but the g2 length was significantly higher (6.26 ± 0.13 and 6.74 ± 0.14 mm). by the ninth day of rearing, g2 fry had higher weight (13.6 ± 0.26 and 18.9 ± 0.07 mg) and length (11.8 ± 0.09 and 14.5 ± 0.04 mm) but by the fifteenth day, g1 fry had higher weight (90.2 ± 1.19 and 68.6 ± 0.77 mg) and length (18.8 ± 0.16 and 18.5 ± 0.04 mm) than g2 fry. by the ninth day of rearing, when fry are recommended to be transferred to outdoor tanks, g2 fry were larger and after 15 days, fry produced by restricted-fed females showed higher survival. the survival rate of g2 progeny by the fifteenth day was significantly higher (24.7 ± 2.07%) than that of g1 progeny (19.2 ± 1.91%). the ration restriction (35% reduction) imposed on matrinx? broodstock during 6 months prior to spawning reduced the number of spawned females and the egg amount, but it did not affect fertilization and hatching rates. otherwise restricted-female larvae were larger and prese
Growth dynamics and climatic sensitivity of Silver fir (Abies alba Mill.) in the European important site (SIC) at the Alpe della Luna - Bocca Trabaria (PU - Italy)
Urbinati C,Gallucci V
Forest@ , 2009, DOI: 10.3832/efor0564-006
Abstract: A dendroecological and dendroclimatic analysis was carried out in silver fir stand of Fonte Abeti, in the Apennines of central Italy. This small forest is the only one present in the northern side of the Marche region and it is currently included as a priority habitat in the Site of Community Interest “ Luna-Bocca Trabaria”. The study aimed to assess the sensitivity of silver fir to the current climate variability and was carried out on 40 dominant trees, for which we reconstructed radial growth dynamics, pointer years and climate-growth relationships. These were computed for the period 1892-2003, using monthly mean temperatures and precipitation drawn from the ALP-IMP climate dataset using simple and moving correlations in order to verify response stationarity through time.
Shallowness and thoughtlessness in the media information on the environment and forests
Urbinati C,Iorio G
Forest@ , 2010,
Abstract: A comment is made on the incredible shallowness and thoughtlessness of a piece in a prime time TV show, during which an authorized and regularly applied forest cut in a coppice stand (Lombardia, northern Italy) was described as an environmental disaster.
Log Terminal Singularities
Alberto Chiecchio,Stefano Urbinati
Mathematics , 2012,
Abstract: In this paper we give a new point of view for optimizing the definitions related to the study of singularities of normal varieties, introduced in [dFH09] and further studied in [Urb12a] and [Urb12b], in relation to the Minimal Model Program. We introduce a notion of discrepancy for normal varieties, and we define log terminal+ singularities. We use finite generation to relate these new singularities with log terminal singularities (in the sense of [dFH09]).
Ample Weil divisors
Alberto Chiecchio,Stefano Urbinati
Mathematics , 2013,
Abstract: We define and study positivity (nefness, amplitude, bigness and pseudo-effectiveness) for Weil divisors on normal projective varieties. We prove various characterizations, vanishing and non-vanishing theorems for cohomology, global generation statements, and a result related to log Fano.
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