Theoretical analysis of an iron mineral-based magnetoreceptor model in birds.
Theoretical analysis of an iron mineral-based magnetoreceptor model in birds.
复制标题
鸟类铁矿物磁感受器模型的理论分析。
DOI：
10.1529/biophysj.107.105098
复制
发表时间：
2007
影响因子：
3.4
通讯作者：
W. Greiner
中科院分区：
文献类型：
--
作者：
I. Solov’yov;W. Greiner
多年来，感应磁场已被确立为各种动物导航和定位的重要组成部分。直到最近，才根据组织学和物理结果发表了第一个关于磁接收的详细受体概念。所考虑的机制涉及两种类型的铁矿物(磁铁矿和磁铁矿)，这两种矿物在几种鸟类上喙感觉树突的亚细胞室中被发现。但到目前为止，还没有对所提议的受体进行定量评估。在本文中，我们建立了一个理论模型来定量和定性地描述含铁矿物颗粒之间的磁场效应。对这些亚细胞隔室之间作用力的分析表明，它们与外部磁场的方向有特别的依赖关系。鸟喙中的铁矿物以结晶的磁铁矿小片和磁铁矿纳米颗粒的集合的形式被发现。我们证明，对连接到细胞膜的磁铁组件的拉力或推力可能达到0.2pN--足以刺激神经细胞中特定的机械感受性膜通道。对鸟喙皮肤中假定的磁感受器系统的理论分析清楚地表明，它确实可能是一种灵敏的生物磁强计，为导航提供了磁性地图的重要部分。
Sensing the magnetic field has been established as an essential part of navigation and orientation of various animals for many years. Only recently has the first detailed receptor concept for magnetoreception been published based on histological and physical results. The considered mechanism involves two types of iron minerals (magnetite and maghemite) that were found in subcellular compartments within sensory dendrites of the upper beak of several bird species. But so far a quantitative evaluation of the proposed receptor is missing. In this article, we develop a theoretical model to quantitatively and qualitatively describe the magnetic field effects among particles containing iron minerals. The analysis of forces acting between these subcellular compartments shows a particular dependence on the orientation of the external magnetic field. The iron minerals in the beak are found in the form of crystalline maghemite platelets and assemblies of magnetite nanoparticles. We demonstrate that the pull or push to the magnetite assemblies, which are connected to the cell membrane, may reach a value of 0.2 pN -- sufficient to excite specific mechanoreceptive membrane channels in the nerve cell. The theoretical analysis of the assumed magnetoreceptor system in the avian beak skin clearly shows that it might indeed be a sensitive biological magnetometer providing an essential part of the magnetic map for navigation.
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影响因子：
3.4
作者：
Gullingsrud, J;Schulten, K
通讯作者：
Schulten, K
影响因子：
3.4
作者：
Ritz, T;Adem, S;Schulten, K
通讯作者：
Schulten, K
影响因子：
5.7
作者：
Sotomayor, M;Corey, DP;Schulten, K
通讯作者：
Schulten, K
影响因子：
3.4
作者：
Hochmuth, RM;Shao, JY;Sheetz, MP
通讯作者：
Sheetz, MP
DOI：
10.1073/pnas.97.22.11765
发表时间：
2000-10-24
影响因子：
11.1
作者：
Hudspeth, AJ;Choe, Y;Martin, P
通讯作者：
Martin, P