Mizukawa Yuri, Miyashita Yuito, Satoh Manami, Shiraiwa Yoshihiro, Iwasaka Masakazu
Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8527, Japan.
Research Institute for Nanodevice and Bio Systems, Hiroshima University, Hiroshima 739-8527, Japan.
Sci Rep. 2015 Sep 1;5:13577. doi: 10.1038/srep13577.
In this study, we present experimental evidence showing that coccoliths have light-scattering anisotropy that contributes to a possible control of solar light exposure in the ocean. Changing the angle between the incident light and an applied magnetic field causes differences in the light-scattering intensities of a suspension of coccoliths isolated from Emiliania huxleyi. The magnetic field effect is induced by the diamagnetic torque force directing the coccolith radial plane perpendicular to the applied magnetic fields at 400 to 500 mT. The developed technique reveals the light-scattering anisotropies in the 3-μm-diameter floating coccoliths by orienting themselves in response to the magnetic fields. The detached coccolith scatters radially the light incident to its radial plane. The experimental results on magnetically oriented coccoliths show that an individual coccolith has a specific direction of light scattering, although the possible physiological effect of the coccolith remains for further study, focusing on the light-scattering anisotropies of coccoliths on living cells.
在本研究中，我们提供了实验证据，表明颗石藻具有光散射各向异性，这可能有助于控制海洋中的太阳光照射。改变入射光与外加磁场之间的角度会导致从赫氏颗石藻中分离出的颗石藻悬浮液的光散射强度产生差异。在400至500毫特斯拉的外加磁场作用下，抗磁扭矩力使颗石藻的径向平面垂直于磁场方向，从而产生磁场效应。所开发的技术通过使直径为3微米的漂浮颗石藻响应磁场而定向，揭示了其光散射各向异性。分离出的颗石藻会沿径向散射入射到其径向平面的光。对经磁场定向的颗石藻的实验结果表明，单个颗石藻具有特定的光散射方向，尽管颗石藻可能的生理效应仍有待进一步研究，重点是活细胞上颗石藻的光散射各向异性。
