Encontrados 4 documentos, a visualizar página 1 de 1
Photoluminescence, photoabsorption and photoemission studies of hydrazone thin ...
Quirino,W. G.; Legnani,C.; Cremona,M.; Reyes,R.; Mota,G. V.; Weibel,D. E.; Rocco,M. L. M.Photoluminescence (PL) emission of 1-(3-methylphenyl)-1,2,3,4-tetrahydroquinoline-6-carboxyaldehyde-1,1 -diphenylhydrazone (MTCD) thin films was monitored as a function of UV irradiation, and it was found to decrease exponentially with the exposure time. In order to gain insight into the degradation mechanisms and evaluate the electronic structure of this organic material used with good results as hole transpor...
Adaptive mutations in bacteria: high rate and small effects
Perfeito, L.; Fernandes, C.; Mota, G.; Isabel, G.Evolution by natural selection is driven by the continuous generation of adaptive mutations. We measured the genomic mutation rate that generates beneficial mutations and their effects on fitness in Escherichia coli under conditions in which the effect of competition between lineages carrying different beneficial mutations is minimized. We found a rate on the order of 10(-5) per genome per generation, which is ...
High specificity PCR screening for 22q11.2 microdeletion in three different eth...
Pereira,A.C.; Corrêa,R.F.R.; Mota,G.F.; Kim,C.A.; Mesquita,S.F.; Krieger,J.E.Congenital heart defects are the most common of all human birth defects. Numerous studies have shown that a deletion within chromosome 22q11 is associated with DiGeorge syndrome and certain forms of sporadic congenital cardiovascular disease. We have determined the value of a PCR assay using markers D22S941, D22S944 and D22S264 designed for the screening of 22q11.2 deletion through consecutive homozygosity in a...
Effect of race, genetic population structure, and genetic models in two-locus a...
Pereira,A.C.; Mota,G.A.; Benseñor,I.; Lotufo,P.A.; Krieger,J.E.Previous genetic association studies have overlooked the potential for biased results when analyzing different population structures in ethnically diverse populations. The purpose of the present study was to quantify this bias in two-locus association studies conducted on an admixtured urban population. We studied the genetic structure distribution of angiotensin-converting enzyme insertion/deletion (ACE I/D) a...
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