In this paper, a history to the Society of Eco-Engineering from Japan Society for CELSS is introduced. It is organized as follows: (1) Introduction; (2) Encounter with CELSS research; (3) In the days of change to the Society of Eco-Engineering; (4) Activities of the reborn Society of Eco-Engineering; (5) Toward the future of the Society of Eco-Engineering.
On the occasion of his receiving the Academic Award from the Society of Eco-Engineering (SEE), the author provided an overview lecture at its annual meeting in June 2018, on the eco-engineering applications in space systems, focusing on the life support systems of the manned space facility. This paper is intended to be a summary of his talk there and a showcase of technology development activities on the space life support systems which he has been involved in.
I have been studying the biological functions and utilization of microorganisms and plants under serious environmental conditions including an extraterrestrial environment. I am also working as a member of the supporting committee of the future societies based on science for the next generation. Here, I introduce a part of my research on closed bio-ecosystems, fungal and plant growth regulators, allelopathy, importance of symbiosis, space agriculture, and utilization of trees. I am also introducing my supporting work for young scientists in the Society of Eco-Engineering.
This study investigated the reduction of available chlorine concentration in hypochlorite acid solution (pH 5.3) during the washing process of freshly cut cabbage. During the washing process, it is assumed that the available chlorine concentration is reduced by the reaction of killing bacteria and contact with organic substance. However, when ca. 6.0 log CFU/ml of Escherichia coli cells or Bacillus subtilis spores were killed to the non-detection level (< 1.0 log CFU/ml) by the hypochlorite acid solution treatment in 10 min, the available chlorine concentration in the hypochlorite acid solution decreased less than 1 ppm. On the other hand, the available chlorine concentration in the hypochlorite acid solution decreased drastically by contact with cell fluid contained in cabbage. Moreover, in the washing process of freshly cut cabbage, a larger decrease in the available chlorine concentration in the hypochlorite acid solution was observed when the cutting width of the cut cabbage was thinner. Therefore, the reduction of the available chlorine concentration in the hypochlorite acid solution during the washing process of the cut cabbage could be mainly caused by contact with cell fluid effused from the cut surface area. Considering these results, the available chlorine concentration in the hypochlorite acid solution during the washing process of freshly cut cabbage should be monitored and controlled in order to prevent the degradation of the washing effect of the hypochlorite acid solution.