Dr. Dawit Solomon as a co-advisor and friend, and I am very grateful for his lessons on S chemistry, for his extraordinary help in the work conducted at the National Synchrotron Light Source, Brookhaven National Laboratory, besides the innumerous lessons of encouragement shared every day. I thank the staff of Cornell University -Prof. Harold van Es, Sue Bishop and Barbara Sledziona for the welcome and pleasant stay at Bradfield Hall. Special thanks for the technicians at the Lehmann's lab:

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... Hanley and Akio Enders for their friendly attention and valuable help in new procedures. Also, my acknowledgements to the staff of other labs, where I could also conduct part of the research: Prof. scary glass constructions for S reduction, cool sausages, incubations, leaching events and XANES spectra I could enjoy the beauty of Ithaca and also learn a lot from this group. It is a pleasure to mention and say thank you to my friends from the graduate program at ESALQ: