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Masaki, Shinzo
概要:
The ground cricket, tentatively identified as Pteronemobius tapro-banensis WALKER, regulates its egg diapause, growth ra
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te, and wing form in response to photoperiod. These responses seem to be physiologically independent of one another, for each of them shows not only a photoperiodic curve, but also a geographic pattern, of its own. Geographic variations in diapause and development indicate at least three different life cycles. (i) A univoltine cycle with eggoverwintering would be prevalent to the north of about 35°N, because the egg enters diapause even in long days (>14 hr), and the nymph controls its growth by a response of short-day type. (ii) A multivoltine cycle with egg-overwintering would be common between 28 and 35°N, because the egg averts diapause in long days, and the long-day retardation of nymphal growth is somewhat reduced. (iii) A multivoltine cycle with nymphal overwintering would occur to the south of about 28°N, because the egg diapause is virtually absent and the nymphal growth is retarded in short days (<14 hr). The last type probably represents a distinct species.
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| 2.
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安野, 眞幸
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安野, 眞幸
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太田, 尚充
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豊嶋, 秋彦
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豊嶋, 秋彦 ; 清, 俊夫 ; 芳野, 晴男
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佐藤, 武司
概要:
Junior high schools in Hirosaki City have no installation to control dust.Without ventilation, the Concentration of the
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fine dust created by student activities are 2 to 7 mg/m^3 in the shop, and these dust conditions can be extremely unhealthy and hazardous.When the windows are kept open, the natural air currents help dilute the fine dust concentrations rapidly.The suitable room temperature for the shop activities is between 20℃ and 26℃, and so, the best period of the year for woodworking is between May and October.
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| 8.
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川村, 正
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木村, 文房
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鈴木, 敏則
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