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  • Author or Editor: J. Batista x
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Abstract  

The main ionogenic radiolytical degradation products are monobutylphosphate, phosphoric acid, formic, acetic, propionic and butyric acids as the result of gamma-irradiation of two-phase water-dibutylphosphate system. The products were determined using capillary isotachophoresis. According two-phase theory the total (T G(X)) and partial (GI(X) for aqueous phase and GII(X) for organic phase) radiation yields of products and decomposition of DBP in the radiolysis of two phase water-dibutylphosphate systems were calculated from the results.

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Abstract  

This paper describes the assessment of exposure levels to metals and possible workers' contamination in three galvanizing factories applying the same processes. Concerning the elements determined in air filters, 92.3% of them were also determined in hair and toenail samples: Ag, Al, As, Au, Cl, Cr, Cu, Fe, Mn, Na, Sb and Zn. These result point out that hair and toenail reflect the influence of the polluted environment on workers' health and can be useful as bioindicators in epidemiological studies. Instrumental neutron activation analysis was applied to all matrices which confirms its status as one of the most versatile analytical techniques.

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Abstract  

This study test whether sublingual administration of nitroglycerin (NTG) could improve the capability of99mTc-MIBI to detect reversibility in exercise-induced perfusion defects and to compare it with the201TI stress-redistribution-reinjection protocol. Twenty-one patients with previous myocardial infarction were submitted to exercise, rest and NTG rest99mTc-MIBI imaging (3-day protocol). The patients also underwent exercise, redistribution and reinjection201Tl myocardial scintigraphy. A total of 273 myocardial segments were analyzed: 76 (28%) had irreversible defects on stress-rest99mTc-MIBI, 60 (79%) appeared as fixed defects and 16 (21%) were reversible on NTG rest99mTc-MIBI. Of the 78 myocardial segments with irreversible defects on standard stress-redistribution thallium cardiac imaging, 63 (81%) did not change and 15 (19%) demonstrated enhanced uptake of thallium after reinjection. Data show that rest NTG99mTc-MIBI study improves the detection of reversible myocardium versus standard exercise/rest99mTc-MIBI and achieve similar results than201Tl reinjection protocol.

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