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| Registros recuperados: 10 | |
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| Mcmillan, A; Quartly, G; Srokosz, M; Tournadre, Jean. |
| [1] Recently developed algorithms have shown the potential recovery of rainfall information from spaceborne dual-frequency altimeters. Given the long mission achieved with TOPEX and the prospect of several other dual-frequency altimeters, we need to validate the altimetrically derived values so as to foster their integration with rain information from different sensors. Comparison with some alternative climatologies shows the bimonthly means for TOPEX to be low. Rather than apply a bulk correction we investigate individual rain events to understand the cause of TOPEX's underestimation. In this paper we compare TOPEX with near-simultaneous ground-based rain radars based at a number of locations, examining both the detection of rain and the quantitative... |
| Tipo: Text |
Palavras-chave: Attenuation; Validation; Rain; Satellite remote sensing; TOPEX. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-695.pdf |
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| Battaglia, Alessandro; Mroz, Kamil; Watters, Daniel; Ardhuin, Fabrice. |
| Attenuation from clouds and precipitation hinders the use of Ka-band in SARs, radar altimeters and in satellite link communications. The NASA-JAXA Global Precipitation Measurement (GPM) mission, with its core satellite payload including a dual-frequency (13.6 and 35.5 GHz) radar and a multifrequency passive microwave radiometer, offers an unprecedented opportunity for better quantifying such attenuation effects. Based on four years of GPM products, this article presents a global climatology of Ka-band attenuation caused by clouds and precipitation and analyses the impact of the precipitation diurnal cycle. As expected, regions of high attenuation mirror precipitation patterns. Clouds and precipitation cause two-way attenuation at 35.5 GHz in excess of 3 dB... |
| Tipo: Text |
Palavras-chave: Attenuation; Cloud and precipitation; Ka-band; Radar. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00600/71196/69562.pdf |
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| Garcia,KO; Berchieri Jr.,A; Santana,AM; Alarcon,MFF; Freitas Neto,OC; Fagliari,JJ. |
| The aim of the present study was to comparatively evaluate hemogram, blood serum components and anatomopathologic alterations in commercial layers experimentally challenged with an attenuated vaccine candidate strain (SG∆cobS∆cbiA) and other two pathogenic strains (SGDcobS and SGNalr) of Gallinarum (SG). In total, 280 commercial layers were randomly divided into 4 groups (G1, G2, G3 and G4). At five days of age, birds from groups G1 received approximately 107 colony forming units (CFU) of SGDcobS; meanwhile birds from group G2 and G3 received the same dose of SGNalr and SG∆cobS∆cbiA, respectively. Birds from G4 were not infected. At 24 hours before (DBI) and 24 hours after (1 DAI), and three (3 DAI), five (5 DAI), seven (7 DAI) ten (10 DAI), and fifteen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acute-phase proteins; Attenuation; Fowl typhoid; Histopathology; Leukogram. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000200004 |
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| Galler,R.; Marchevsky,R.S.; Caride,E.; Almeida,L.F.C.; Yamamura,A.M.Y.; Jabor,A.V.; Motta,M.C.A.; Bonaldo,M.C.; Coutinho,E.S.F.; Freire,M.S.. |
| A chimeric yellow fever (YF)-dengue serotype 2 (dengue 2) virus was constructed by replacing the premembrane and envelope genes of the YF 17D virus with those from dengue 2 virus strains of Southeast Asian genotype. The virus grew to high titers in Vero cells and, after passage 2, was used for immunogenicity and attenuation studies in rhesus monkeys. Subcutaneous immunization of naive rhesus monkeys with the 17D-D2 chimeric virus induced a neutralizing antibody response associated with the protection of 6 of 7 monkeys against viremia by wild-type dengue 2 virus. Neutralizing antibody titers to dengue 2 were significantly lower in YF-immune animals than in YF-naive monkeys and protection against challenge with wild-type dengue 2 virus was observed in only 2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: YF 17D virus recombinants; Dengue vaccine; Immunogenicity; Attenuation; Rhesus monkeys. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001200012 |
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| The yellow fever (YF) virus is the prototype flavivirus. The use of molecular techniques has unraveled the basic mechanisms of viral genome structure and expression. Recent trends in flavivirus research include the use of infectious clone technology with which it is possible to recover virus from cloned cDNA. Using this technique, mutations can be introduced at any point of the viral genome and their resulting effect on virus phenotype can be assessed. This approach has opened new possibilities to study several biological viral features with special emphasis on the issue of virulence/attenuation of the YF virus. The feasibility of using YF virus 17D vaccine strain, for which infectious cDNA is available, as a vector for the expression of heterologous... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Flavivirus; Yellow fever virus; Attenuation; Vaccine; Gene expression. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000200002 |
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| Registros recuperados: 10 | |
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