Hi Coral people Does anybody knows the e-mail of GLEN T. SHEN or the way I may contact him? Thanks in advance GUILLERMO HORTA-PUGA INVEMAR, BIOGEOQUÍMICA, UBIPRO, UNAM-IZTACALA AP 314, TLALNEPANTLA, MEXICO 54000 TEL: +(52) 56231126, 56231132, 58904806 FAX. +(52) 56231225 E-MAIL: horta at servidor.unam.mx