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      Effects of combined DC and AC magnetic fields on germination of hornwort seeds.

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      Bioelectromagnetics

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          Abstract

          Seeds of hornwort (Cryptotaenia japonica Hassk) were exposed to sinusoidally time-varying extremely low frequency (ELF) magnetic fields (AC fields) in combination with the local geomagnetic field (DC field). Exposure lasted 24 h/day for 16 days. Three directions of the AC magnetic fields were considered; the vertical (magnetic flux density B ACV, the directions parallel B ACparallel), and perpendicular B ACperpendicular to the direction of total geomagnetic field (magnetic flux density BG) in the geomagnetic plane (GP). Controls consisted of seeds exposed to zero AC magnetic fields in combination with the DC magnetic field. The B ACV in combination with BG effectively promoted the germination of hornwort seeds when applied at 750 microT (RMS) at 7 Hz or 500 microT (RMS) at 14 Hz from among the cases of individual frequencies f = 3.5, 7.0, 10.5, 14.0 Hz at 500 and 750 microT. The B ACparallel promoted the germination of hornwort seeds more effectively than the B ACperpendicular in combination with BG when 500 and 750 microT at 7 Hz were applied.

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          Author and article information

          Journal
          Bioelectromagnetics
          Bioelectromagnetics
          0197-8462
          0197-8462
          Oct 2004
          : 25
          : 7
          Affiliations
          [1 ] Department of Electrical and Electronic Engineering, Faculty of Engineering, Ibaraki University, Hitachi, Ibaraki, Japan. kobayasi@ee.ibaraki.ac.jp
          Article
          10.1002/bem.20032
          15376241
          97f2c26e-6dc5-417f-8263-ee5277639103
          2004 Wiley-Liss, Inc.
          History

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