(C) 2009 Elsevier Ltd. All rights reserved.”
“The surface morphology and electrical conductance of C-60-precoated Si(111)root 3-Au and Si(111)root 3-Ag surfaces have been monitored in the course of Au and Ag depositions. In both cases, the deposited metal atoms penetrate through the fullerene layers. However, the similarity in the growth mode does not result in similar dependencies of conductance versus deposited metal dose. Deposition of Au
onto the C60-precoated Si(111)root 3-Au surface leads to a monotonic gradual increase in conductance starting from similar to 0.4 ML Au coverage. Deposition of Ag onto the C-60-precoated Si(111)root 3-Ag surface results buy AMN-107 in a nonmonotone peak-like dependence buy Pevonedistat with a maximum at similar to 0.5 ML of Ag. Both dependencies can be explained in terms of the acceptor-type behavior of the fullerenes, which trap the electrons donated by Au or Ag atoms. The difference between the two dependencies is a consequence of the difference in conduction mechanisms at the original surfaces, namely, the main conductance channel in Si(111)root 3-Au is the space-charge layer, while in
Si(111)root 3-Ag it is the surface state band. (C) 2011 American Institute of Physics. [doi:10.1063/1.3658019]“
“Infertile men have higher levels of semen reactive oxygen species (ROS) than do fertile men. High levels NVP-HSP990 of semen ROS can cause sperm dysfunction, sperm DNA damage and reduced male reproductive potential. This observation has led clinicians to treat infertile men with antioxidant supplements. The purpose of this article is to discuss the rationale for antioxidant therapy in infertile men and to evaluate the data on the efficacy of dietary and in vitro antioxidant preparations
on sperm function and DNA damage. To date, most clinical studies suggest that dietary antioxidant supplements are beneficial in terms of improving sperm function and DNA integrity. However, the exact mechanism of action of dietary antioxidants and the optimal dietary supplement have not been established. Moreover, most of the clinical studies are small and few have evaluated pregnancy rates. A beneficial effect of in vitro antioxidant supplements in protecting spermatozoa from exogenous oxidants has been demonstrated in most studies; however, the effect of these antioxidants in protecting sperm from endogenous ROS, gentle sperm processing and cryopreservation has not been established conclusively. Asian Journal of Andrology (2011) 13, 374-381; doi:10.1038/aja.2010.182; published online 25 April 2011″
“Rett syndrome is characterized by loss of motor and social functions, development of stereotypic hand movements, seizures, and breathing disturbances. This study evaluates the presence of overnight respiratory disturbances.