Effects of the Space Flight Environment on
the Immune System
G. Sonnenfeld, .S. Butel and W.T. Shearer.......1
Neurotoxic and Molecular Effects of
Methylmercury in Humans
A.F. Castoldi, T. Coccini and L. Manzo.........19
Diseases Associated with Poor Water and
Sanitation: Hazards, Prevention, and Solutions
M. Kulshrestha and A.K. Mittal........33
Child Health Implications of Worldwide Urbanization
Michael
Gracey.........51
Soil Enzyme Activities as Biological Indicators of Soil Health
I. Alkorta,
A. Aizpurua, P. Riga, I. Albizu, I. Amézaga, C. Garbisu........65