1. Department of Agriculture, Food and EnvironmentUniversity of CataniaCataniaItaly
2. Anaerobic Digestion Research and Education Center, Department of Biosystems and Agricultural EngineeringMichigan State UniversityEast LansingMIUSA
3. Department of Agricultural and Food SciencesAlma Mater Studiorum‐University of BolognaBolognaItaly
4. Department of Microbiology and Molecular GeneticsMichigan State UniversityEast LansingMIUSA
5. Department of Chemical Engineering and Materials ScienceMichigan State UniversityEast LansingMIUSA