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311 results on '"Iwasaki, Yuichi"'

131. Immersion exposure system using high-index materials

Author

Sakai, Keita, primary, Iwasaki, Yuichi, additional, Mori, Sunao, additional, Yamada, Akihiro, additional, Ogusu, Makoto, additional, Yamashita, Keiji, additional, Nishikawara, Tomofumi, additional, Tanaka, Takatoshi, additional, Hasegawa, Noriyasu, additional, Hara, Shin-ichi, additional, and Watanabe, Yutaka, additional

Published
2008
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144. Some Papers are Hard to Follow: Why is That, And How Can We Improve?

Author

Iwasaki, Yuichi and Shappell, Nancy W

Subjects
UNEMPLOYED people, ENVIRONMENTAL toxicology
Abstract

In our respective careers in the field of environmental toxicology, we have read many peer-reviewed papers. We believe that there are 4 stakeholder groups responsible for improving the clarity and readability of published papers: educators, authors, editors, and reviewers. Although we agree with De Vries et al. (2009) that reviewers are responsible for "critical, thorough, thoughtful, constructive and timely" review, we do not agree with an author's neglect in fine-tuning her or his writing, with the attitude that "the reviewers would fix it.". [Extracted from the article]

Published
2021
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147. Assessment of COVID-19 risk and prevention effectiveness among spectators of mass gathering events

Author

Yasutaka, Tetsuo, Murakami, Michio, Iwasaki, Yuichi, Naito, Wataru, Onishi, Masaki, Fujita, Tsukasa, and Imoto, Seiya

Abstract

•The COVID-19 risk in Japanese professional baseball and football games is calculated.•Wearing a face mask and washing hands can reduce the risk of infection by 86% to 95%.•The number of newly infected individuals is dependent on the number of spectators.•Total estimated number of new infections after the games is below 10 per 3–4 million.•The gap between estimated and reported number of new infections is a small.

Published
2022
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149. Can Chemical Toxicity in Saltwater Be Predicted from Toxicity in Freshwater? A Comprehensive Evaluation Using Species Sensitivity Distributions.

Author

Yanagihara, Miina, Hiki, Kyoshiro, and Iwasaki, Yuichi

Subjects
*SPECIES distribution, *ECOLOGICAL risk assessment, *FRESH water, *NUMBERS of species, *ENVIRONMENTAL toxicology
Abstract

Species sensitivity distributions (SSDs) play an important role in ecological risk assessment. Estimating SSDs requires toxicity data for many species, but reports on saltwater species are often limited compared to freshwater species. This limitation can constrain informed management of saltwater quality for the protection of marine ecosystems. We investigated the relationships between the parameters (i.e., mean and standard deviation [SD]) of freshwater and saltwater log‐normal SSDs to determine how accurately saltwater toxicity could be estimated from freshwater toxicity test data. We estimated freshwater and saltwater SSDs for 104 chemicals with reported acute toxicity data for five or more species and compared their means, SDs, and hazardous concentrations for 5% of the species (HC5) derived from the acute SSDs. Standard major axis regression analyses generally showed that log–log relationships between freshwater and saltwater SSD means, SDs, and HC5 values were nearly 1:1. In addition, the ratios of freshwater‐to‐saltwater SSD means and HC5 values for most of the 104 chemicals fell within the range 0.1–10. Although such a strong correlation was not observed for SSD SDs (r2 < 0.5), differences between freshwater and saltwater SSD SDs were relatively small. These results indicate that saltwater acute SSDs can be reasonably estimated using freshwater acute SSDs. Because the differences of the means and SDs between freshwater and saltwater SSDs were larger when the number of test species used for SSD estimation was lower (i.e., five to seven species in the present study), obtaining toxicity data for an adequate number of species will be key to better approximation of a saltwater acute SSD from a freshwater acute SSD for a given chemical. Environ Toxicol Chem 2022;41:2021–2027. © 2022 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC. [ABSTRACT FROM AUTHOR]

Published
2022
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150. COVID-19 risk assessment at the opening ceremony of the Tokyo 2020 Olympic Games

Author

Murakami, Michio, Miura, Fuminari, Kitajima, Masaaki, Fujii, Kenkichi, Yasutaka, Tetsuo, Iwasaki, Yuichi, Ono, Kyoko, Shimazu, Yuzo, Sorano, Sumire, Okuda, Tomoaki, Ozaki, Akihiko, Katayama, Kotoe, Nishikawa, Yoshitaka, Kobashi, Yurie, Sawano, Toyoaki, Abe, Toshiki, Saito, Masaya M., Tsubokura, Masaharu, Naito, Wataru, and Imoto, Seiya

Abstract

•COVID-19 risk at the opening ceremony of Tokyo Olympic Games was assessed•Without measures, one infector entry produced 1.5–1.7 newly infected individuals•Prevention by organizers and spectators achieved a 99% risk reduction•Crude probability of infectors should be < 5 × 10−5 for the suppression of infection

Published
2021
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