Screening for endophytic nitrogen-fixing bacteria in brazilian sugar cane varieties used in organic farming and description of Stenotrophomonas pavanii sp. nov - Ramos, Patrícia L; Van Trappen, Stefanie; Thompson, Fabiano L; Rocha, Rafael C. S; Barbosa, Heloiza Ramos; Vos, Paul de; Moreira-Filho, Carlos Alberto (International journal of systematic and evolutionary microbiology, 2011)