世界一受けたい授業》ダニを退治する一番の弱点は乾燥！ダニを活発化させず増殖させない方法は湿度の低く（50%以下）保つこと！
※世界一受けたい授業 2013年9月7日放送分より
凶悪ダニを増殖させないマル秘生活術！
恐ろしい様々なダニを研究している、
ダニのスペシャリスト五箇公一先生が
ダニの知識を分かり易く解説する。
秋にダニ・マダニが活発化・発生するという内容は、
コチラの記事にて記載。
ダニの一番の弱点は乾燥！
ダニを退治するには湿度50%以下にする！
ダニは結局他の昆虫と同じく節足動物の為、
変温動物（気温によって体温が変化する動物）である。
その為、
ダニはマイナス20度という非常に低い温度でも、
50度という非常に高い温度においても、
すぐには死なないで活動し続ける。
しかしダニを退治する、
一番の弱点という部分が実はある。
番組ではダニをテープに貼り付け、
湿度を下げていきどこで活動が停止すのかを実験。
すると湿度47%の所で、
ダニの活動が停止した。
実はダニは湿度50%以下になると、
活動が弱まり、
更にその状態が続くと、
脱水を起こして死んでしまうという。
この実験から身の回りの物を、
天日干しして湿度50%以下にすれば、
完全には退治出来なくても、
ダニの活動が弱められるので、
増殖を防ぐことが出来る。
ちなみにマットレスを天日干しする場合は、
片面だけやっても、
ダニは湿度の高い裏面に逃げてしまう為、
きちんと退治する為には、
裏面も日に当てて乾燥させることが大事である。
また、夏場など、
湿度の高い時は布団乾燥機が非常に効果的だという。
五箇公一先生によると、
ダニは非常に体が小さいので、
なかなか体に水分を蓄えることが出来ず、
乾燥に極端に弱い生物である。
だから風通しを良くして乾燥させるというのが、
ダニの増殖を抑える上では、
一番のポイントであると説明された。
《もうちょっと調べてみた&所感》
この話を逆に言えば、
ダニの一番住み心地の良いポイントは、
湿度の高い場所となります。
人によっては、
部屋の構造上湿度が高くなり易い、
という悩みを持っている人もいるでしょう。
そういった場合は、
エアコンを除湿設定にするか、
別途除湿機を購入して、
出来るだけ、
部屋の湿度を50%以下に落とすよう心がけましょう。
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