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Spatial scaling of species abundance distributions
Borda-de-Água, Luís; Borges, Paulo A. V.; Hubbell, Stephen P.; Pereira, Henrique M.Copyright © 2012 The Authors. Ecography © 2012 Nordic Society Oikos. ; Species abundance distributions are an essential tool in describing the biodiversity of ecological communities. We now know that their shape changes as a function of the size of area sampled. Here we analyze the scaling properties of species abundance distributions by using the moments of the logarithmically transformed number of individual...
Study of endogenous profile of hCG in male Brazilian athletes
Pereira,Henrique M. G.; Ramos,Sandra B.; Dal Sasso,Marco Aurélio; Poças,Elisa S. C.; Padilha,Mônica C.; Gomes,Luis Nelson F.In the world of performance enhancing drugs, human Chorionic Gonadotrophin (hCG) is increasingly used alone and also in combination with various Anabolic Androgenic Steroid cycles. In males, hCG mimics luteinizing hormone (LH) and helps increase testosterone production in the testes. As such, hCG is commonly used during and after steroid cycles to maintain and restore testicular size as well as endogenous testo...
Improvements in steroid screening in doping control with special emphasis to GC...
Marques,Marlice A. S.; Pereira,Henrique M. G.; Aquino Neto,Francisco R. deA procedure is described for the simultaneous determination of androgenic substances including steroids and beta2-agonists. The method involves analysis of hydrolized urinary anabolic compounds using liquid-liquid extraction, with subsequent conversion to trimethylsilylether derivatives for the analysis by GC-MS. Pulse split injection 1/10 of the TMS derivatives at 280 °C into the capillary column, initiall...
Análise de glicocorticosteróides por CG-EM: uma nova abordagem de derivatização...
Pereira,Henrique M. G.; Marques,Marlice A. S.; Cardoso,Jarí N.; Aquino Neto,Francisco R.Glucocorticosteroids (CT) show a powerful anti-inflammatory effect. In view of this, they are extensively used in sports medicine, but their misuse (systemic administration) can lead to severe injuries on athletes and has been restricted by the IOC in recent years. For GC-MS analysis, a derivatization step is necessary in order to convert them to a stable form, thus preventing thermal breakdown with the loss of...
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