Kyushu University Academic Staff Educational and Research Activities Database
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KENJI SAKAI Last modified date:2018.06.29

Professor / Division of Systems Bioengineering
Department of Bioscience and Biotechnology
Faculty of Agriculture

Graduate School
Undergraduate School
Other Organization
Administration Post

Home Page for Laboratory of Soil and Environmental Microbiology .
Academic Degree
Dr. of Agriculture
Country of degree conferring institution (Overseas)
Field of Specialization
Applied Microbiology
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
Basic studies on environmental microbiology and their application to conversion of waste biomass, sustainable production system, and environmental protection.
Research Interests
  • Ecology and Application of Thermophilic Microorganisms
    keyword : extremely thermophile, thermophilic lactic acid-producing bacteria, composting
  • Improvement of Wastewater treatment in Chemical Industry
    keyword : Pyrrosequence, Calcitrant cheicals
  • Microbiology in treatment of waste material and waste water
    keyword : biological nitrogen removal, biofertilizer
  • Studies on thermophilic microorganisms for producing functional compost from organic waste materials
    keyword : composting, thermophilic microorganism organic waste materials
  • Molecular microbiological analysis of mixed culture system
    keyword : mixed culture system, molecular microbiological analysis
  • Molecular analysis of intestinal microorganisms in soil earthwarm
    keyword : earthwarm, intestinal microorganisms
  • Studies on prebiotics and probiotics
    keyword : probiotics, prebiothics
  • Glycosidases of Bifidobacteria
    keyword : glycosidase,
Current and Past Project
  • New CORE TO CORE PROGRAM A. Advanced Research Networks on Establishment of an international research core for new bio-research fields with microbes from tropical areas
  • Creation of Green Innovative Industry from Oil Palm Plantation for the Bornean Bio-diversity Conservation
Academic Activities
Works, Software and Database
1. .
1. KENJI SAKAI, Microbiological Research Toward Sustainable Palm Oil Industry
Coexisting With Environmental and Biodiversity Conservation
, THE MALAYSIAN SOCIETY FOR MICROBIOLOGY, 2017.12, Microbial transforming process of organic waste are generally operated with specific mixed culture systems. Also, complex microbial communities existed in environment such as natural forest, plantation forest, river and wastewater drainage, intestinal tracts of animals and palm rhizosphere. Recent development of next generation DNA sequencer gave us a strong tool for analyzing structure of these complex microbial community. After knowing structure and functions of microorganisms in a mixed microbial biotransformation system, we could improve and control the system. If we could trace specific bacteria in the waste materials animals and plant rhizosphere, with general structures in soil and river water, they would provide useful information to know impact of palm oil industry to surrounding environment and to understand biodiversity in soil, fauna and flora.
We, Kyushu University joined SATREPS Project aiming Promotion of Green Economy with Palm Oil Industry for Biodiversity Conservation, and have been collaborated with KIT, Japan, UPM and UMS, Malaysia. Within ecosystems in Sabah, Malaysia, a dynamic assemblage of soil, water, plants and animals which are delicately inter-connected. In this lecture, I would like to introduce three microbial research topics our team involved in the project. (1) Acceleration of the total waste recycling using enhanced mixed microbial conversion process. (2) Monitoring of bacterial community in surrounding river water as an indicator for waste water discharge. (3) Investigation of biodiversity of animals (dung beetle) and bacterial diversity of mammal feces, soil and river water in primary, secondary, and palm oil forest..
2. KENJI SAKAI, Exploring Microbial Community Which Is Useful for Transformation of Biomass Waste, International Symposium for Biotechnology Advances, 2013.12.
  • Studies on highly functional fermented-products made from
    un-utilized biomass resources by thermophilic bacteria
  • High acetone–butanol–ethanol production in pH-stat co-feeding of acetate and glucose
  • Fed-batch fermentation for enhanced lactic acid production from glucose/xylose mixture without carbon catabolite repression
  • Efficient butanol production without carbon catabolite repression from mixed sugars with Clostridium saccharoperbutylacetonicum N1-4
  • Novel high butanol production from lactic acid and pentose by Clostridium saccharoperbutylacetonicum
Educational Activities
Applied and environmental microbiology
Professional and Outreach Activities
A member of Asian Core Programs between Japan and Thai, and Japan Malaysia, Supported by JSPS.