著者

白石 文秀

出版者

一般社団法人 日本計画行政学会

雑誌

計画行政 (ISSN:03872513)

巻号頁・発行日

vol.46, no.2, pp.21-26, 2023-05-15 (Released:2023-06-08)

参考文献数

14

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Chemicals released from detergents, shampoos, cosmetics, and other products have caused serious health problems in recent years. Patients complain of distress from fragrances and other substances emitted from the clothing and bodies of those nearby on trains and in the workplace, rendering them unable to engage in normal activities. This article gives basic information related to the problem of chemical sensitivity and discusses the purification of air containing volatile organic compounds released from detergents using an air purification system developed by the authors.

著者

平井 優美 白石 文秀

出版者

一般社団法人 植物化学調節学会

雑誌

植物の生長調節 (ISSN:13465406)

巻号頁・発行日

vol.53, no.2, pp.139-145, 2018 (Released:2018-12-28)

参考文献数

42

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Plant metabolism is characterized by a wide diversity of metabolites, with systems far more complicated than those of microorganisms. Therefore, plant metabolic engineering is still a challenge compared to microbial engineering. Metabolic engineering requires system-level understanding of metabolism and mathematical modeling is useful for understanding dynamic behaviors of plant metabolic systems. Time-series metabolome data has great potential for estimating kinetic model parameters to construct a genome-wide metabolic network model. However, data obtained by current metabolomics techniques does not meet the requirement for constructing accurate models. In this article, we highlight novel strategies and algorithms to handle the underlying difficulties and construct dynamic in vivo models for large-scale plant metabolic systems. The coarse but efficient modeling enables predictive metabolic engineering and also the prediction of unknown mechanisms regulating plant metabolism.

著者

白石 文秀

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.33, no.1, pp.7-13, 2021-01-31 (Released:2021-01-31)

参考文献数

16

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A network system of new coronavirus infection disease (COVID-19) is characterized using Biochemical systems theory (BST). A differential equation model is constructed in the framework of BST and the parameter values in the equations are determined from the infection data reported for the infected, recovered, and dead individuals (from January 15 to April 29, 2020) in Japan. Nondimensional analysis suggests that the time courses of dependent variables related to the infection are governed by two dimensionless parameters: G (the ratio of rate constants) and x20 (the initial value for the ratio of infected individual number and population), and G must be greater than unity in order to certainly decrease the infected individual number to zero. The infection data in the initial stage indicates that if there was no action to protect, the infected individual number exponentially increased because G=0.0839143 < 1; for 120 million of the population in Japan, almost all persons were infected and the dead individual number increased to 16.8 million. Actually, however, the numbers of infected and dead individuals were only 16,305 and 749, respectively, suggesting that the contact rate was significantly reduced in a very short period of time. The analysis also indicates that x2 takes a maximum when x1 (the ratio of uninfected individual number and population) is equal to G. When the nosocomially infected individual number is equal to 10 % of the total number of infected individuals, the infected individual number never becomes zero unless the nosocomial infection is regulated even when the community infection is kept zero; in this case, the nosocomial infection must be aggressively reduced.

著者

白石 文秀

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.27, no.2, pp.49-50, 2015-04-30 (Released:2015-05-26)

参考文献数

5

著者

白石 文秀

出版者

九州大学

巻号頁・発行日

1984

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博士論文