Jinapang Peeraya, Prakob Panida, Wongwattananard Pongtorn, Islam Naz E, Kirawanich Phumin
Department of Electrical Engineering, Mahidol University, Nakhon Pathom, Thailand.
Bioelectromagnetics. 2010 Oct;31(7):519-27. doi: 10.1002/bem.20584.
Effects of high-frequency, continuous wave (CW) electromagnetic fields on mung beans (Vigna radiata L.) and water convolvuluses (Ipomoea aquatica Forssk.) were studied at different growth stages (pre-sown seed and early seedling). Specifically, the effects of the electromagnetic source's power and duration (defined as power-duration level) on the growth of the two species were studied. Mung beans and water convolvuluses were exposed to electromagnetic fields inside a specially designed chamber for optimum field absorption, and the responses of the seeds to a constant frequency at various power levels and durations of exposure were monitored. The frequency used in the experiments was 425 MHz, the field strengths were 1 mW, 100 mW, and 10 W, and the exposure durations were 1, 2, and 4 h. Results show that germination enhancement is optimum for the mung beans at 100 mW/1 h power-duration level, while for water convolvuluses the optimum germination power-duration level was 1 mW/2 h. When both seed types were exposed at the early sprouting phase with their respective optimum power-duration levels for optimum seed growth, water convolvuluses showed growth enhancement while mung bean sprouts showed no effects. Water content analysis of the seeds suggests thermal effects only at higher field strength.
研究了高频连续波（CW）电磁场在不同生长阶段（播种前种子和幼苗早期）对绿豆（Vigna radiata L.）和空心菜（Ipomoea aquatica Forssk.）的影响。具体而言，研究了电磁源的功率和持续时间（定义为功率 - 持续时间水平）对这两个物种生长的影响。绿豆和空心菜被放置在一个专门设计的腔室内以实现最佳场吸收，在此条件下使其暴露于电磁场中，并监测种子在不同功率水平和暴露持续时间下对恒定频率的响应。实验中使用的频率为425 MHz，场强分别为1 mW、100 mW和10 W，暴露持续时间为1小时、2小时和4小时。结果表明，对于绿豆，在100 mW/1 h功率 - 持续时间水平下发芽促进效果最佳，而对于空心菜，最佳发芽功率 - 持续时间水平为1 mW/2 h。当两种种子在早期发芽阶段以各自的最佳功率 - 持续时间水平进行暴露以实现最佳种子生长时，空心菜表现出生长增强，而绿豆芽则没有受到影响。种子的水分含量分析表明，仅在较高场强下存在热效应。
