著者

佐藤 潔

出版者

日本香粧品学会

雑誌

日本香粧品学会誌 (ISSN:18802532)

巻号頁・発行日

vol.41, no.1, pp.44-48, 2017-03-31 (Released:2018-03-31)

参考文献数

6

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When our skin is exposed to the solar light, perceptible skin reactions are induced by ultraviolet A ray (UVA) and ultraviolet B ray (UVB). UVB causes erythema after several hours followed by pigmentation called delayed tanning after a few days. On the other hand, the skin exposed to UVA exhibits grayish brown colored pigmentation immediately after UVA exposure without causing erythema. The pigmentation persists more than several hours and the color gradually changes to brown. This persistent pigmentation is called persistent pigment darkening (PPD) reaction. To indicate the UV protection level of sunscreen, SPF and PA labeling are used. SPF stands for “Sun Protection Factor” and PA stands for “Protection Grade of UVA.” The number of SPF means the number of times longer that you will be protected from getting erythema, which is mainly induced by UVB, with sunscreen than you will be without sunscreen. PA grade is determined based on the protection level of PPD reaction induced by UVA. In the case of PA labeling, the degree of protection is labeled as PA+, PA++, PA+++ or PA++++ on a sunscreen product. The more plus (+) mark means the more protection level against UVA. The current test methods related to UV protection are harmonized globally. Global standard ISO24444 is adopted as Japanese standard test method for SPF measurement and ISO24442 is adopted as Japanese standard test method for UVA protection measurement.

著者

内川 公人 山田 喜紹 佐藤 潔 熊田 信夫

出版者

日本衛生動物学会

雑誌

衛生動物 (ISSN:04247086)

巻号頁・発行日

vol.35, no.3, pp.233-243, 1984

被引用文献数

3 1

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Field surveys were carried out monthly during the period from August 1981 to September 1982 to add to the basic knowledge of the vectors of tsutsugamushi disease in Nagano Prefecture, where outbreaks of the disease were reported in the spring of 1981 after a lapse of 14 years. Field mice and voles were trapped alive at stations selected mostly in grasslands in Miasa Village and Iida City. Preliminary or additional surveys were also done at irregular intervals in these areas and in Yamanouchi Town and Matsumoto City. From four kinds of field rodents examined, a total of 51,548 chiggers comprising three genera and 12 species was collected and identified. Among them, Leptotrombidium pallidum, L. intermedium, L. fuji, and Gahrliepia saduski were the predominant species in this order. L. scutellare, one of the known vectors in Japan, was not collected during the study, suggesting that L. pallidum would have played the role of vector in the recent reoccurrence of tsutsugamushi disease in Nagano Prefecture. Remarkable difference was observed among the average numbers of chiggers taken from different kinds of hosts. Conspicuous variations in host perference of some chigger species were also observed depending on the localities of collection. Habitat specificity was distinctly demonstrated by the fact that the faunal compositions of chigger species were closely related with the topographical features of the lands surveyed. Seasonal fluctuation of chiggers also differed depending on the localities of the survey. For example, average number of L. pallidum on the rodents showed a peak of occurrence in the late fall at the stations in Iida, while the same species of chigger had two peaks, one in spring and the other in autumn, at the stations in Miasa. The importance of studying the favorable habitats for the vector was discussed from the epidemiological viewpoints.

著者

内川 公人 山田 喜紹 佐藤 潔 熊田 信夫

出版者

日本衛生動物学会

雑誌

衞生動物 (ISSN:04247086)

巻号頁・発行日

vol.34, no.2, 1983-06-15

著者

宮澤 隆仁 宮岡 誠 佐藤 潔

出版者

順天堂医学会

雑誌

順天堂医学 (ISSN:00226769)

巻号頁・発行日

vol.41, no.1, pp.124-128, 1995

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右中頭蓋窩底部より発生, 右側頭葉に埋没するように発育し, CT上神経膠腫との鑑別が困難であった46歳男性の脳内神経鞘腫の一症例を報告する. 術中所見より本腫瘍は中頭蓋窩底部硬膜内三叉神経硬膜枝より発生したと考えられた. 脳神経との関係をもたない脳内神経鞘腫15例について文献的考察を加える.

著者

工藤 純夫 和智 明彦 佐藤 潔

出版者

日本脳神経外科コングレス

雑誌

脳神経外科ジャーナル (ISSN:0917950X)

巻号頁・発行日

vol.4, no.4, pp.370-375, 1995-07-20 (Released:2017-06-02)

参考文献数

20

被引用文献数

1 3

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MRIを用いて髄液の拍動速度を測定することで,脊髄くも膜下腔内をゆっくり移動する髄液を捉える方法を開発した.本方法により髄液循環における拍動とは異なった髄液のゆっくりした移動が測定可能と考えられた.各年齢層の正常例において,頸髄周囲4箇所の髄液拍動と移動の測定を試みたところ,髄液のゆっくりした移動は脊髄腹側が背側,側面のものに比較して有意に遠かった.また脊髄腹側の髄液移動と髄液拍動速良には正の相関がみられた.髄液のゆっくりした移動速度の年齢分布は乳児期から加齢とともに増加する傾向を有し,10歳前後で100〜200mm/minとpeakに達した.また,頭蓋骨縫合の癒合を認めない新生児,乳児では,1心拍間の髄液移動距離は少ないものの心拍数は多く,1分間の移動距離(速度)は成人に匹敵するかそれを上まわる特徴があった.