著者

山口 歩

出版者

日本科学史学会

雑誌

科学史研究. 第II期 (ISSN:00227692)

巻号頁・発行日

vol.31, no.181, pp.9-18, 1992-03-25

参考文献数

96

被引用文献数

2

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In japanese power plants, water-tube boilers had been used since the end of nineteenth century. By 1910, water-tube boilers for japanese battleships had come to be manufactured in Japan. But most of boilers in the japanese power plants were made by Babcock & Wilcox Co. in United States or England. In this paper, the author has analyzed what the most important factor was for Babcock & Wilcox boilers to be equipped in japanese power plants, and has examined the reason why few boilers made by japanese factories used in the power plants. Babcock & Wilrox Co. got the first patant for the water-tube boiler in 1867, and worked out main technical problems in their boilers before 1880. So the boilers made by Babcock & Wilcox Co. were spreaded widely in United States by the end of nineteenth century. One of the merits of the Babcock & Wilrox boiler was the good water circulation system, but some other water-tube boilers, the Heine boiler or the Miyahara boiler for example, had also the same merits. A more impotant merit peculiar to the Babcock & Wilrox boiler was the high durability during to the absence of deteriorating strains, and so the boilers seldom required repairs.

著者

山口 歩

出版者

日本科学史学会

雑誌

科学史研究. 第II期 (ISSN:00227692)

巻号頁・発行日

vol.31, no.181, pp.9-18, 1992-03-25

参考文献数

96

被引用文献数

2

---

In japanese power plants, water-tube boilers had been used since the end of nineteenth century. By 1910, water-tube boilers for japanese battleships had come to be manufactured in Japan. But most of boilers in the japanese power plants were made by Babcock & Wilcox Co. in United States or England. In this paper, the author has analyzed what the most important factor was for Babcock & Wilcox boilers to be equipped in japanese power plants, and has examined the reason why few boilers made by japanese factories used in the power plants. Babcock & Wilrox Co. got the first patant for the water-tube boiler in 1867, and worked out main technical problems in their boilers before 1880. So the boilers made by Babcock & Wilcox Co. were spreaded widely in United States by the end of nineteenth century. One of the merits of the Babcock & Wilrox boiler was the good water circulation system, but some other water-tube boilers, the Heine boiler or the Miyahara boiler for example, had also the same merits. A more impotant merit peculiar to the Babcock & Wilrox boiler was the high durability during to the absence of deteriorating strains, and so the boilers seldom required repairs.

著者

井澤 修平 吉田 怜楠 大平 雅子 山口 歩 野村 収作

出版者

日本生理心理学会

雑誌

生理心理学と精神生理学 (ISSN:02892405)

巻号頁・発行日

vol.34, no.3, pp.245-249, 2016-12-30 (Released:2018-10-06)

参考文献数

8

被引用文献数

4

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爪に含まれるコルチゾールは過去の比較的長期的なホルモンの動態を反映すると考えられているが,その標準的な定量方法についてはまだ確立されたものがない。本研究では爪試料の粉砕粒度や抽出時間が爪試料から抽出されるコルチゾール量に与える影響を検討した。健常な男性14名から手の爪を採取した。爪試料を1, 4, 16分間粉砕し,粉砕粒度の条件(粗い,中程度,細かい)を設定した。また,粉砕した検体はメタノールにより抽出処理を行うが,本研究では抽出時間を1, 6, 24, 48時間の4条件に設定した。上澄み液にろ過処理を施し,蒸発乾固させた後に,最終的にコルチゾールの抽出量を酵素免疫測定により評価した。粉砕粒度と抽出時間を要因とした分散分析を行った結果,粉砕粒度が細かいほど,また抽出時間が長いほど,コルチゾールの抽出量が多いことが示された。また,粉砕粒度と抽出時間の交互作用が有意であり,爪試料が中程度以上に粉砕されていて,かつ抽出時間が48時間の条件では,粉砕粒度の影響は小さいことも示された。本研究では粉砕粒度や抽出時間が爪からのコルチゾールの抽出量に影響を与えることを明確に示した。爪からコルチゾールを測定する際はこれらの要因にも留意する必要性が示された。

著者

山口 歩

出版者

日本科学史学会

雑誌

科学史研究 (ISSN:21887535)

巻号頁・発行日

vol.31, no.181, pp.9-18, 1992 (Released:2021-04-07)

著者

山口 歩

出版者

立命館大学産業社会学会

雑誌

立命館産業社会論集 = Ritsumeikan social sciences review (ISSN:02882205)

巻号頁・発行日

vol.55, no.1, pp.131-154, 2019-06

著者

大平 雅子 吉田 怜楠 山口 歩 井澤 修平 本多 元 野村 収作

出版者

日本生理人類学会

雑誌

日本生理人類学会誌 (ISSN:13423215)

巻号頁・発行日

vol.22, no.3, pp.153-159, 2017

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The aims of this study were to extract the stress biomarkers from human hair samples and explore the optimalprocedure for this extraction. The investigation included a methodological variation related to the extraction time andpulverization method in the procedure for the determination of stress biomarkers. Consequently, the three stressbiomarkers, cortisol, testosterone, and dehydroepiandrosterone were successfully extracted from the hair sample.Moreover, the pulverization method had no impact on the determination procedure. Additionally, the extraction timesignificantly affected the amount of the target substances. An optimal procedure based on the results of this studywas proposed.

著者

大平 雅子 吉田 怜楠 山口 歩 井澤 修平 本多 元 野村 収作

出版者

日本生理人類学会

雑誌

日本生理人類学会誌 (ISSN:13423215)

巻号頁・発行日

vol.22, no.3, pp.153-159, 2017 (Released:2017-10-31)

---

The aims of this study were to extract the stress biomarkers from human hair samples and explore the optimal procedure for this extraction. The investigation included a methodological variation related to the extraction time and pulverization method in the procedure for the determination of stress biomarkers. Consequently, the three stress biomarkers, cortisol, testosterone, and dehydroepiandrosterone were successfully extracted from the hair sample. Moreover, the pulverization method had no impact on the determination procedure. Additionally, the extraction time significantly affected the amount of the target substances. An optimal procedure based on the results of this study was proposed.