Relationship between Migraine acute attacks and changes in Prolactin secretion

History and Objectives: Considering the high incidence of migraine attacks and significance of a knowledge of its pathogenesis and the hypothesis of using serum prolactin level as a marker of its diagnosis, this study was carried out to find out a relationship on referrals of Kerman neuroscience center.Materials and Methods: This study was carried out on 20 cases with a definite diagnosis of migraine and 20 cases with non-migraine headache according to HIS criterion. Blood prolactin level was measured before attacks and drug consumption and during attacks and data were statistically analyzed.Results: Out of 40 patients, case group had a reduction in prolactin level from 5.3±3.7 to 4.4±2.4 and control group had a reduction from 5.7±2.9 to 5.4±3.4. In addition, the difference was not significant.Conclusion and Recommendations: There was not any increase in serum prolactin during acute attacks of migraine. It is recommended to conduct more studies for evaluation of increased dopaminergic activity as a key causative factor of migraine

Effect of surface contamination on the performance of a section of a wind turbine blade

AbstractA series of low speed wind tunnel tests were conducted on a section of a 660 kW wind turbine blade to examine the effects of distributed surface contamination on its performance characteristics. The selected airfoil was tested with a clean surface, two types of zigzag roughness, strip tape roughness and distributed contamination roughness. The straight and zigzag leading edge roughness models simplify the contamination results in an early turbulence transition. In this study, surface contamination was simulated by applying 0.5 mm height roughness over the entire upper surface of the airfoil. The distribution density varied from the leading edge to the trailing edge of the model. Our data show that this particular airfoil was very sensitive to surface contamination and its maximum lift coefficient decreased up to 35%, while the stall angle of attack increased slightly. The surface contamination, however, caused very smooth stall characteristics and less lift drop in the post stall region. In contrast to the clean model, the maximum lift coefficient of the roughened airfoil increased with Reynolds number. The effects of zigzag roughness and strip tape roughness were less than that of the distributed contamination roughness