I would like to thank the PROMEP (the Faculty
Improvement Program) and Autonomous University
of Tamaulipas, Mexico for the economic support
provided to carry out this study. Thanks all the staff at
the Environmental Research Lab (ERL) especially I
would like to extend my sincere appreciation to Dr.
Kevin Fitzsimmons and Dr. Stephen G. Nelson, for
helping me with countless revisions and make
invaluable comments and suggestions to this article