Preliminary examination for cell numbers of total bacteria and coliform bacteria on tablewares, cutting boards, kitchen knives, faucets, and scouring sponges in our kitchen laboratories revealed that high rates (3.5 - 7.6x10⁵cfu) of coliform bacteria were found in scouring sponges. Quantitative examination resulted in the presence of average 10⁷ - 10⁸ cfu of coliform bacteria per one sponge. Using sodium hypochrolite and benzalkonium chloride as disinfectants, conditions to completely kill 10⁸ cfu of Escherichia coli were established: After one sponge loaded with 10⁸ cfu of E.coli was well crumpled in 200 ml of 2.5 ppm sodium hypochrolite or 50 ppm benzalkonium chloride for 5 min, all bacteria disappeared.

View full abstract

[in Japanese]

View full abstract

I designed a thin client system based on Ubuntu which was one of Linux distribution. It can make a mind map from each thin client terminal by installing XMind in the server. Using this, I practiced visual thinking on learning activity. In addition, by the question investigation to a learner, there were many answers in acknowledgment of the effect. "Work (writing a report) became effective" in particular was appreciated.

View full abstract

'antibadmail' is introduced as UBE measures in Shokei Educational Institution (SEI) and it has already been operated for three years or more. It becomes possible to refer to the transition of the acceptance rate at any time by log analysis of 'antibadmail' and by using RRDtool. It is observed that the average acceptance rate is 50 to 80 percent. This time, we tried the classification of the cause of the reception refusal half a year of the past instead of the transition of such an acceptance rate. We coclude that the recipient address doesn't exist and the incorrect HELO are two major cause. It was also able to be concluded that the majority of UBE were with incorrect HELO, and had to use HELO as a cause of the refusal in the future though it was doubtful to use the injustice of HELO as an index of the reception refusal.

View full abstract