The first research about the characterization of thermophilic
bacteria which were forming aerobic spores and able to grow at 70 °C
was done by Miquel in 1888. Since then particularly the spore forming
bacteria belong to Bacillus and Clostridium genera, many strains of the
thermophilic bacteria have been characterized (Maugeri et al., 2001;
Belduz et al., 2003).