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生物节律理论 | 2013-1-18 8:43:00

生物节律理论.doc

By:章仁根 | 阅读全文 | 回复(15) | 引用通告 | 编辑

标签：生物节律理论

Re:生物节律理论 | 2013-1-18 8:44:35

生物节律(Biological Rhythms)现象直接和地球、太阳及月球间相对位置的周期变化对应。①日节律(Circadian Rhythm)。以24小时为周期的节律,通称昼夜节律(如细胞分裂、高等动植物组织中多种成分的浓度、活性的24小时周期涨落、光合作用速率变化等)。②潮汐节律。生活在沿海潮线附近的动植物,其活动规律与潮汐时相一致。③月节律。约29.5天为一期,主要反映在动物动情和生殖周期上。④年节律。动物的冬眠、夏蛰、洄游,植物的发芽、开花、结实等现象均有明显的年周期节律。除天体物理因子外,光线、温度、喂食、药物等因素在一定程度上可起调时作用。此外,还有一些生物节律不受外界影响,正常成人心搏每分钟70次,酶合成和酶活性的振荡周期为1到几十分钟,神经电位发放频率则可达101～102赫。通常把生物体内激发生物节律并使之稳定维持的内部定时机制称为生物钟。对生物钟有两种假说:一种认为生物体系根据外界自然周期现象定时,因而产生了与天体物理因子等同步的节律;另一种认为生物钟是先天性和遗传性的,是一种内在的振荡机制。

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原创 | 2016-9-6 16:58:52

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原创 | 2016-9-28 16:34:06

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原创 | 2016-9-30 11:10:16

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Re:在漫画中识别身边的违章 | 2016-10-9 16:10:50

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Re:在漫画中识别身边的违章 | 2016-10-11 3:32:33

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Re:在漫画中识别身边的违章 | 2016-10-17 17:42:25

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Re:在漫画中识别身边的违章 | 2016-10-18 2:49:46

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Re:在漫画中识别身边的违章 | 2016-10-19 15:24:09

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Re:在漫画中识别身边的违章 | 2016-10-20 17:12:52

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Re:在漫画中识别身边的违章 | 2016-10-23 4:34:45

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Re:在漫画中识别身边的违章 | 2017-2-20 17:33:18

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