A special issue of the selected papers from ISEB21 participants will be published in Geomicrobiology Journal in 2014. All oral and poster presenters at ISEB21 are eligible for the paper submission. The content of the papers should be within the field of biogeochemistry. The deadline for the submission is December 31, 2013. Papers should be submitted via the journal’s online submission system, at http://mc.manuscriptcentral.com/ugmb. Please select Special Issue in the article type menu when you submit your papers. Submission should also be accompanied by a cover letter indicating that it is for the “Special Issue of ISEB21”. All submitted papers will be peer reviewed. The format of manuscript should follow strictly the Journal style and much attention should be paid to the English writing. The manuscript may be rejected after a first glance if the English and format were not up to the criteria of the journal.