Protein-based nanobiosensor for direct detection of hydrogen sulfide Meisam Omidi, Ghasem Amoabediny, Fatemeh Yazdian and M. Habibi-Rezaei EPL, 109 1 (2015) 18005 Published online: 23 January 2015 DOI: 10.1209/0295-5075/109/18005