没有合适的资源?快使用搜索试试~ 我知道了~
首页60Hz磁场对草履虫行为的瞬时影响研究
60Hz磁场对草履虫行为的瞬时影响研究
需积分: 9 0 下载量 184 浏览量
更新于2024-08-07
收藏 139KB PDF 举报
"这篇学术论文研究了60赫兹磁场对草履虫(Paramecium multimicronucleatum)行为的影响。研究发现,当草履虫暴露在0.6特斯拉的垂直磁场中时,它们会聚集在容器的上端。进一步分析游泳行为显示,磁场暴露在开始后1分钟内显著增加了向上游动的细胞数量。这种影响是瞬时的,在持续暴露的几分钟内逐渐消失。研究提出,磁场可能放大了草履虫的负向重力反应。此外,论文还讨论了诱导电场对草履虫游泳行为的影响。" 详细解释: 这篇论文属于生物电磁学领域,探讨的是低频磁场(60赫兹)对生物体行为的影响。草履虫,一种常见的单细胞生物,被用作模型细胞来研究这一现象。实验中,研究人员将草履虫置于一个强度为0.6特斯拉的垂直磁场中,观察其行为变化。 结果显示,草履虫在磁场作用下表现出一种聚集现象,趋向于移动到磁场的上方。这可能是因为磁场影响了草履虫的导航机制,尤其是它们的重力感应能力。通常情况下,草履虫会通过负向重力反应避免下沉,而在磁场中,这种反应似乎被加强了。在磁场暴露的初期,草履虫向上游动的数量显著增多,但这种效应并不持久,几分钟后就减弱直至消失。 此外,论文还涉及了诱导电场对草履虫游泳行为的影响。在电磁场中,除了磁场外,还会产生诱导电场。这些电场可能对细胞内部的离子分布和生物电活动产生影响,从而改变草履虫的运动方向或速度。然而,具体的机制和影响程度需要进一步的研究来揭示。 这项研究对于理解生物体如何感知和响应电磁环境具有重要意义,同时也为生物电磁效应的生物学基础提供了新的见解。这些发现可能对生物物理学、环境科学以及潜在的生物技术应用有深远的影响,比如在生物传感器设计或生物医学研究中利用这些效应。
资源详情
资源推荐
Bioelectromagnetics 21:584^588 (2000)
Effect of a 60 Hz Mag netic F i e l d on the
Beha vio r of
Paramecium
Yasuo Nakaoka,
1
* Kiku o Sh i mizu,
2
Kenj i Hasegaw a,
3
and Takayoshi Yamamoto
2
1
D i visio n of Bioph y s i cal Engi neer ing, G raduate School of Engineering Science,
Osaka Un iversity,Toyonaka , Osaka , Japan
2
Radioisotope Research Center, Osaka University, Suita, Osaka, Japan
3
Div is ion of Bra in Sciences , Graduate School of Medicine , K itasato U ni versity,
Sagami hara, Kanagawa , Japan
Paramecium multimicronucleatum was used as a model cell to study the effects of 60 Hz magnetic
fields on swimming behavior. When exposed to a vertical field of 0.6 T, the cells accumulated at the
upper end of the cuvette. An analysis of the swimming behavior revealed that the exposure to the
field increased the number of cells swimming upwards maximally at 1 min after onset of the
exposure. This effect of the magnetic field was transient, disappearing within a few minutes during
the exposure. It is suggested that the magnetic field may amplify to a large extent the negative
gravitaxis of Paramecium. Effects of an induced electric field on the swimming behavior are also
discussed. Bioelectromagnetics 21:584±588, 2000.
ß 2000 Wiley-Liss, Inc.
Key words: Paramecium; ELF magnetic field; swimming behavior; gravitaxis; transient behavior
change
INTRODUCTION
The ciliated protozoan, Paramecium, is sensitive
to various stimuli in the environment. Mechanical,
thermal, chemical, and electric ®eld stimuli induce
rapid changes in the swimming behavior of this species
[for reviews see Jennings, 1906; Naitoh and Eckert,
1974]. When Paramecium cells are placed in a
temperature gradient, the cells show thermotaxis,
accumulating where the temperature is that at which
the cells have been cultured [Nakaoka and Oosawa,
1977]. Moreover, Paramecium responds to the gravi-
tational force and swims upwards to accumulate in
the uppermost part of the vessel. Such response to
gravitational force is called negative gravitaxis, for
which different mechanisms have been proposed
[Verworn, 1889; Machemer and Bra
È
ucker, 1992;
Hemmersbach et al., 1999].
The swimming behavior is closely associated
with the membrane potential which is determined by
the permeability of ion channels located in the cell
membrane [for reviews see Saimi and Kung, 1987;
Machemer, 1988]. Membrane depolarization triggers
the opening of Ca
2
channels localized in the ciliary
membrane, which causes the reversal of ciliary beat-
ing. Membrane hyperpolarization enhances the ciliary
beating, which accelerates the forward swimming.
There are reports that magnetic ®elds affect the
swimming behavior of Paramecium. A low frequency
magnetic ®eld (50 Hz, 0.5±2 mT) increases both the
swimming velocity and the directional changes of the
cell tracks [Hemmersbach et al., 1997]. On the other
hand, a static magnetic ®eld (0.126 T) increases only
the directional changes, but decreases the swimming
velocity [Rosen and Rosen, 1990]. These behavioral
changes have been discussed in relation to the
functional alteration of channels in the cell membrane.
This study tests the effect of magnetic ®elds on
the vertical swimming of Paramecium. Magnetic ®eld
exposure enhances the accumulation at the upper end
of the cuvette. Such accumulation is caused by gradual
changes in the swimming orientation to direct move-
ment to the upper end. The effect of magnetic ®eld is
discussed in relations to the gravitaxis and thermotaxis
of Paramecium.
MATERIALS AND METHODS
Paramecium multimicronucleatum was cultured
in a hay infusion inoculated with Klebsiella pneumo-
ß 2000 Wiley-Liss,Inc.
ÐÐÐÐÐÐ
*Correspondence to: Yasuo Nakaoka, Division of Biophysical
Engineering, Graduate School of Engineering Science, Osaka
University, Toyonaka, Osaka 560-8531, Japan. E-mail:
nakaoka@bpe.es.osaka-u.ac.jp
Received for review 6 May 1999; Final revision received 17
January 2000
下载后可阅读完整内容,剩余4页未读,立即下载
weixin_38723516
- 粉丝: 4
- 资源: 982
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
最新资源
- Hadoop生态系统与MapReduce详解
- MDS系列三相整流桥模块技术规格与特性
- MFC编程:指针与句柄获取全面解析
- LM06:多模4G高速数据模块,支持GSM至TD-LTE
- 使用Gradle与Nexus构建私有仓库
- JAVA编程规范指南:命名规则与文件样式
- EMC VNX5500 存储系统日常维护指南
- 大数据驱动的互联网用户体验深度管理策略
- 改进型Booth算法:32位浮点阵列乘法器的高速设计与算法比较
- H3CNE网络认证重点知识整理
- Linux环境下MongoDB的详细安装教程
- 压缩文法的等价变换与多余规则删除
- BRMS入门指南:JBOSS安装与基础操作详解
- Win7环境下Android开发环境配置全攻略
- SHT10 C语言程序与LCD1602显示实例及精度校准
- 反垃圾邮件技术:现状与前景
资源上传下载、课程学习等过程中有任何疑问或建议,欢迎提出宝贵意见哦~我们会及时处理!
点击此处反馈
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功