Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

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Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Mechanism of pyrite depression by marine Fe(II)-oxidizing bacteria in seawater flotation

  Shigeshi Fuchida, Keishi Oyama, Jifeng Xue, Chiharu Tokoro, Yuma Shimizu, Hibiki Miura, Kokoro Kitagawa, Hiroko Makita , 2024.11

  Minerals Engineering

  DOI

• Large sulfur isotope fractionation during abiotic consumption of hydrogen sulfide after cessation of bacterial growth in batch culture experiments of sulfate reducing bacteria

  Fumihiro Matsu’ura, Hiroko Makita, Ken Takai, Mayuko Nakagawa Yuichiro Ueno , 2023.12

  Earth and Planetary Science Letters

  DOI

• Utilization of cement-based materials for deep sea infrastructure

  Keisuke Takahashi, Mari Kobayashi, Yuichiro Kawabata, Takafumi Kasaya, Mitsuyasu Iwanami, Toshiro Yamanaka, Shun Nomura, Hiroko Makita , 2023.03

  2023 IEEE Underwater Technology (UT)

• Utilization of cement-based materials for deep sea infrastructure

  Keisuke Takahashi, Mari Kobayashi, Yuichiro Kawabata, Takafumi Kasaya, Mitsuyasu Iwanami, Toshiro Yamanaka, Shun Nomura, Hiroko Makita , 2023.03

  2023 IEEE Underwater Technology (UT)

  DOI

• Heterologous expression and functional characterization of cysteamine dioxygenase from the deep-sea mussel Bathymodiolus septemdierum

  Kotaro Yoda, Toshiyuki Takagi, Tomoko Koito, Masahiko Okai, Hiroko Makita, Satoshi Mitsunobu, Takao Yoshida, Koji Inoue , 2023.03

  Fisheries Science

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Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Towards improving the durability of concrete materials using microbial functions in deep-sea environments

  Project Period (FY)： 2022/04  -  2027/03  Investigator(s): 牧田 寛子

  Grant-in-Aid for Scientific Research(B)  Principal Investigator  23K22965 

• Possibility of biosphere driven by iron

  Project Period (FY)： 2020/04  -  2022/03  Investigator(s): 牧田 寛子

  Grant-in-Aid for Scientific Research on Innovative Areas (Publicly Research)  Principal Investigator  20H04610 

• The challenge of using microbial functions to improve the durability of concrete materials

  Project Period (FY)： 2018/04  -  2021/03  Investigator(s): Makita Hiroko

  Grant-in-Aid for Scientific Research(C)  Principal Investigator  18K04595 

  The aim of this study was to investigate the effectiveness of microbial functions in improving the durability of concrete materials in marine environments by means of exposure and immersion experiments in lab. and actual marine environments using test specimens to which organic matter was added to stimulate in-situ microbial activity. During the study period, the specimens were placed in a cold seawater tank and in marine environment to determine the physico-chemical changes in the specimens and to identify the microbial community that flourished in each specimen.As a result, this study was able to identify the microbial species that prefer to grow in the specimens, to show that the addition of organic matter to the specimens promotes the growth of specific microorganisms, and that the function of the microorganisms that prefer the specimens on the seafloor may be effective in controlling degradation.

• Structural analysis of peculiar organic materials produced by marine bacteria: Mechanism for microbial conversion of CO2 in the seawater to organic materials

  Project Period (FY)： 2014/04  -  2017/03  Investigator(s): MAKITA Hiroko

  Grant-in-Aid for Young Scientists(B)  Principal Investigator  26820389 

  This research aims to investigate the possibility of substance production utilizing carbon dioxide in the seawater independent of photosynthesis, and to construct a circulation system to remove CO2 from the environment using microbial functions. In order to achieve the purpose, it is necessary to establish a new mass-culturing method of chemotrophic bacteria and to evaluate the usefulness of extracellular organic materials they produce.
  In this study, we succeeded in developing a mass-culturing method of marine iron oxidizing bacteria using CO2 in the seawater as the carbon source for their growth. Moreover, we succeeded in isolating a number of new iron-oxidizing bacteria using this method, as well as in clarifying the composition and structure of extracellular organic materials they produce. Through the present research, we obtained crucial knowledge required for the development of a system to produce organic materials from CO2 in the seawater by microbial activity.

• Microbial corrosion in the deep sea environment

  Project Period (FY)： 2010  -  2012  Investigator(s): MAKITA Hiroko

  Grant-in-Aid for Young Scientists(B)  Principal Investigator  22760646 

  The main objective of this study is to reveal the molecular mechanisms of microbiologically induced corrosion (MIC) in the deep-sea environments. During the investigation process, we have succeeded in isolation of a high H2S-producing novel bacterium, chemical analyses and biological studies of the natural corrosion areas (iron mats), as well as establishing a new analytical method for directly determining the relationships between mineral and microorganisms.

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Lesson Subject 【 display / non-display 】

Lesson Subject 【 display / non-display 】