State University of Campinas

About: State University of Campinas is a education organization based out in Campinas, Brazil. It is known for research contribution in the topics: Population & Context (language use). The organization has 49454 authors who have published 104606 publications receiving 1841004 citations. The organization is also known as: UNICAMP & State University of Campinas.

The impact of a 17-day training period for an international championship on mucosal immune parameters in top-level basketball players and staff members.

Abstract: This investigation examined the impact of a 17-d training period (that included basketball-specific training, sprints, intermittent running exercises, and weight training, prior to an international championship competition) on salivary immunoglobulin A (SIgA) levels in 10 subjects (athletes and staff members) from a national basketball team, as a biomarker for mucosal immune defence. Unstimulated saliva samples were collected at rest at the beginning of the preparation for the Pan American Games and 1 d before the first game. The recovery interval from the last bout of exercise was 4 h. The SIgA level was measured using enzyme-linked immunosorbent assay and expressed as absolute concentrations, secretion rate, and SIgA level relative to total protein. The decrease in SIgA levels following training was greater in athletes than in support staff; however, no significant differences between the two groups were detected. A decrease in SIgA level, regardless of the method used to express IgA results, was verified for athletes. Only one episode of upper respiratory tract illness symptoms was reported, and it was not associated with changes in SIgA levels. In summary, a situation of combined stress for an important championship was found to decrease the level of SIgA-mediated immune protection at the mucosal surface in team members, with greater changes observed in the athletes.

Infrared transitions between hydrogenic states in cylindrical GaAs-(Ga,Al)As quantum-well wires.

Abstract: Results for the binding and infrared transition energies associated with the ground and first few excited states of a hydrogenic-donor impurity in a cylindrical GaAs-${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Al}}_{\mathit{x}}$As quantum-well wire are presented. A variational approach for the trial envelope wave functions corresponding to each donor state is used within the effective-mass approximation. Results are obtained for several wire radii in the case of donors located at the axis of the quantum-well wire. We find that the impurity states 2${\mathit{p}}_{\mathit{x}}$ (2${\mathit{p}}_{\mathit{y}}$) and 3${\mathit{p}}_{\mathit{x}}$ (3${\mathit{p}}_{\mathit{y}}$) are not bounded when the wire radius is sufficiently small, a behavior similar to the one found for impurities in quantum-well heterostructures.