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RPC-PET: status and perspectives
M. Couceiro; A. Blanco; Nuno C. Ferreira; R. Ferreira Marques; P. Fonte; L. LopesThe status of the RPC-PET technology for small animals is briefly reviewed and its sensitivity performance for human PET studied through Monte-Carlo simulations. The cost-effectiveness of these detectors and their very good timing characteristics open the possibility to build affordable TOF-PET systems with very large fields of view. Simulations suggest that the sensitivity of such systems for human wholebody s...
Microwave-assisted solvent extraction and analysis of shikimic acid from plant ...
Matallo,M.B; Almeida,S.D.B; Cerdeira,A.L; Franco,D.A; Blanco,F.M.G; Menezes,P.T.C; Luchini,L.C; Moura,M.A.M; Duke,S.OA better method for determination of shikimate in plant tissues is needed to monitor exposure of plants to the herbicide glyphosate [N-(phosphonomethyl)glycine] and to screen the plant kingdom for high levels of this valuable phytochemical precursor to the pharmaceutical oseltamivir. A simple, rapid, and efficient method using microwave-assisted extraction (MWAE) with water as the extraction solvent was develop...
Decomposição de argilas em forno de microondas e determinação simultânea dos se...
Silva,Claudineia R.; Nóbrega,Joaquim A.; Blanco,TelmaIn this work a closed-vessel microwave-assisted acid decomposition procedure for clays was developed. Aluminum, Ca, Fe, K, Mg, Na, Si, and Ti were determined in clay digestates by inductively coupled plasma optical emission spectrometry. The most critical parameter for total decomposition of clays was the composition of the reagent mixture. The applied power and the heating time exerted a less critical influenc...
Análise de suspensões de argilas por espectrometria de emissão óptica com plasm...
Silva,Cíntia S.; Nóbrega,Joaquim A.; Blanco,TelmaThe goal of this study was to evaluate the feasibility of direct introduction of clay slurries in an inductively coupled plasma optical emission spectrometer with axial view configuration. Calibration was performed using a certified reference material with a mean particle size of 13 µm (IPT-42) and the analytical curve was applied for quantification of two others reference materials (IPT-28 and IPT-32) an...
Beta-globin gene cluster haplotypes in Venezuelan sickle cell patients from the...
Moreno,Nancy; Martínez,José A.; Blanco,Zorella; Osorio,Leidys; Hackshaw,PatrickSeven polymorphic sites in the beta-globin gene cluster were analyzed on a sample of 96 chromosomes of Venezuelan sickle cell patients from the State of Aragua. The Benin haplotype was predominant with a frequency of 0.479, followed by the Bantu haplotype (0.406); a minority of cases with other haplotypes was also identified: atypical Bantu A2 (0.042), Senegal (0.031), atypical Bantu A7 (0.021) and Saudi Arabia...
Multicomutação e amostragem binária em análise química em fluxo: determinação e...
Kronka,Eloisa Ap. Mocheuti; Reis,Boaventura Freire dos; Vieira,Jonas A.; Blanco,Telma; Gervasio,Ana Paula G.A flow system based on multicommutation and binary sampling process was developed to implement the sample zone trapping technique in order to increase the spectrophotometric analytical range and to improve sensitivity. The flow network was designed with active devices in order to provide facilities to determine sequentialy analyte with a wide concentration range, employing a single pumping channel to propel sam...
Muertes por homicidio, consecuencia fatal de la violencia: el caso de Mexico, 1...
López,María Victoria; Híjar Medina,Martha C.; Rascón Pacheco,Ramón A.; Blanco Muñoz,JuliaSe analizaron las muertes registradas como homicidio en México de 1979-1992. El estudio se basó en fuente secundaria, siendo las variables analizadas: año, edad, sexo y causa externa de traumatismos y envenenamientos según CIE IX Rev.(E960-E969). Se utilizó un modelo de regresión Poisson para las causas más frecuentes, obteniendo riesgos relativos según edad y sexo. El grupo de referencia fue el de 10-14 años y...
Distribuição mensal da emergência de seis ervas daninhas em solos com e sem cul...
Blanco,Hélio G.; Arevalo,Roberto A.; Blanco,Flávio M. G.Foram realizados no período de 14 meses, com início em outubro de 1988, levantamentos demográficos mensais para registro da dinâmica de emergência de seis espécies de ervas daninhas anuais, submetidas mensalmente a um dos seguintes sistemas de manejo da população: grade de disco, grade de disco seguida de rolo compactador do solo, enxada rotativa, e herbicida de contato. Os resultados mostraram que a distribuiç...
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