Selenium analysis by neutron activation was performed on serum samples taken from 20 workers at a rubber tire repair shop and from a control group of 18 healthy persons. The mean values were: 148 +/- 56 (70-296) and 100 +/- 18 (70-127) micrograms/L for the tire workers and the control groups, respectively. The difference between mean values was significant (p < 0.01). A high correlation (r = 0.82) was obtained between selenium level and seniority for those values higher than the control group range. None of the shop workers showed evidence of selenosis.

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Introduction: The Caiman grasper is a radiofrequency instrument that allows cutting and sealing of tissues and blood vessels, with the added benefit of a distal closure that allows a stable pressure in its 26.5mm long tip, with a less than 1mm thermic injury of the adjacent tissues, with energy regulation depending on the tissue characteristics, allowing to seal up to 7mm vessels. All the above makes dissection easier and diminishes surgical time, making the laparoscopic procedures safer and faster, including urologic surgeries.