A few years ago it became apparent that these metals are essential elements for methano- and methylotrophic bacteria
. One representative is the bacterium Methylacidiphilum fumariolicum SolV, which was found in a volcanic mudpot near Naples, Italy, and is known to be strictly dependent on REEs such as lanthanum and cerium for its growth.
Recently, the biodegradative potential of methylotrophic bacteria toward different polluted compounds, such as explosive, methyl tert-butyl ether (MTBE), and PAHs, has been reported [44-46].
Different studies have reported plant growth-promoting abilities in aerobic methylotrophic bacteria. They are considered to be phytosymbionts and can participate in plant development via the biosynthesis of phytohormones, nitrogen fixation, or by the suppression of ethylene biosynthesis in plants , although these activities have never been reported in M.
Madhaiyan and coworkers  reported the ability of pink-pigmented facultative methylotrophic bacteria (PPFMs) belonging to the genus Methylobacterium to promote seed germination and plant growth as well as to induce systematic resistance in rice.
Bousfield, "A taxonomic study of some Gram-negative facultatively methylotrophic bacteria," Microbiology, vol.
Goonetilleka et al., "Molecular detection and isolation of facultatively methylotrophic bacteria, including Methylobacterium podarium sp.
Wood, "Isolation and molecular detection of methylotrophic bacteria occurring in the human mouth," Environmental Microbiology, vol.
Chapters are dedicated to microorganisms involved in nitrogen and sulfur cycling as well as iron- and manganese-reducing, aerobic hydrogen-oxidizing (Knallgas), methanogenic, and methylotrophic bacteria
. This portion of the book also includes chapters targeted at the examination of terrestrial fungi, free-living protozoa, and bacteriophages.