Publications by authors named "Seiichiro Ioka"
This study was undertaken to investigate the redox potential (Eh) of sulfidic groundwater in unconsolidated sediments. The Eh was determined by long-term (several days to several weeks) continuous in situ potentiometric measurements using a platinum (Pt) electrode. The Eh values measured in two monitoring campaigns were -259 and -202 mV, respectively.
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- Research on microbial ecosystems in deep crystalline rocks shows geochemical factors affect microbial biomass, diversity, and activities, but specifics are not well understood.
- * Groundwater samples from the Mizunami Underground Research Laboratory, collected in 2005 and 2008, revealed low levels of major electron acceptors and moderate richness of dissolved organic carbon and gases like CH(4) and H(2).
- * The study found Thauera spp. as the dominant microbes in both years, with shifts to Brevundimonas spp. under certain conditions, indicating stable microbial communities shaped by environmental limitations.