著者

岩田 重信 岩田 義弘 大山 俊廣 門山 浩 斎藤 正治 高須 昭彦

出版者

日本喉頭科学会

雑誌

喉頭 (ISSN:09156127)

巻号頁・発行日

vol.10, no.1, pp.1-7, 1998-06-01 (Released:2012-09-24)

参考文献数

18

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The electroglottogram (EGG) has been used to obtain details of vocal fold vibration. Applications of the EGG, however, are limited in use for voice disorders since characteristics of EGG waveforms associated with vocal fold vibrations are still poorly understood. We analysed the EGG waveform characteristics to compare them with simultaneous measurements of supra and subglottic pressure in the normal male subject sustaining the vowel /a/ at constant pitch with different intensity levels. The results are : The periodicities of the consequent frequency are completely coincident among the EGG wave, supra and subglottic pressure waveforms at different intensity levels. With regard to the amplitude variations of the EGG waveform in the vocal cycle, the increasing amplitude corresponded with a rapid increase of subglottic pressure and a decrease of supraglottic pressure which is indicative of the closing phase of the vocal folds. The gradual fall of amplitude associated with the parting of the vocal folds corresponded with an increase of supraglottic pressure from negative values and maintenance of negative subglottic pressure. The negative flatter portion of EGG wave corresponding to the opened phase exhibited higher positive supra glottal pressure and lower pressure of the subglottic even at different sound pressure levels. When increasing the intensity during constant pitch phonation, the values of the contact quotient and contact speed index decreased, and the contact closing slope became steeper.These findings reveal the tendency of increasing vocal tension following louder vocalization. Simultaneous measurement of EGG waveforms, and supraglottic and subglottic pressures might provide useful and detailed information for understanding EGG waveforms, laryngeal dysfunction and/or research for voice disorders.

著者

友田 晴彦 斎藤 正治郎 大石 雅文 白石 振作

出版者

公益社団法人 日本化学会

雑誌

日本化学会誌(化学と工業化学) (ISSN:03694577)

巻号頁・発行日

vol.1989, no.12, pp.2059-2062, 1989-12-10 (Released:2011-05-30)

参考文献数

17

被引用文献数

5

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2-アミノ-3-クロロキノキサリンが2,3-ジクロロキノキサリンのホル1ムアミド溶液ヘアンモニアガスを吹き込むことにより生成し,同様な反応系に過剰の塩化アンモニウムを添加すると2,3-ジアミノキノキサリンが生成した。ビス(3-アミノ-2-キノキサリニル)アミンは2,3-ジクPtPtキノキサリンのホルムアミド溶液に高温でアンモニアガスを吹き込むことにより得られた。5,11-ジヒドPt-5,6,11,12-テトラアザナフタセソを過マンガン酸カリウムで酸化すると1,4-ジヒドロ-1,4,9,10-テトラアザアントラセン-2,3-ジオンが生成した。従来知られているキノキサリン誘導体の融点の文献問の違いは,分子内および分子間縮合反応によることがわかった。

著者

吉岡 哲志 竹内 健二 斎藤 正治 内藤 健晴 藤井 直子 片田 和廣

出版者

日本耳科学会

雑誌

Otology Japan (ISSN:09172025)

巻号頁・発行日

vol.13, no.2, pp.111-117, 2003-05-31

参考文献数

20

被引用文献数

2

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We demonstrated high-resolution multiplanner reformation (MPR) and 3-dimentional CT (3D-CT) imaging of Eustachian tube (ET) using a 1-mm, 8-row multislice CT scanner.<BR>CT scans were performed in 5 normal adult volunteers during quiet breathing and the Valsalva maneuver.<BR>Bony portion of ET was clearly detected on MPR, however cartilaginous portion of the ET was still elusive during quiet breathing scan.<BR>MPR and 3D-CT images during Valsalva maneuver improved visualization of cartilaginous portion of the ET and surrounding soft tissues including cartilage, muscle and fat.<BR>Imaging of the ET obtained by multislice CT during the Valsalva maneuver can propose further investigation for various middle ear disorders.