活力发电机的分布控制着米托斯螺旋的位置
Stephan W Grill1, Jonathon Howard, Erik Schäffer
1Max Planck Institute of Molecular Cell Biology and Genetics, D-01307 Dresden, Germany. grill@mpi-cbg.de
概括
不平等的细胞分裂依赖于螺旋的定位. 由G蛋白信号驱动的更多的力量拉向后侧,导致C. elegans胚胎的这种移位.
科学领域:
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
- 生物物理学的生物物理.
背景情况:
- 在不平等的细胞分裂过程中,线粒状必须精确地定位,以确保适当的细胞命运决定.
- 异常的轴定位对于不对称的细胞分裂至关重要,但根本的力量尚未完全理解.
研究的目的:
- 为了研究净力失衡的基础,导致单细胞Caenorhabditis elegans胚胎中的线粒螺旋转移.
- 确定负责产生使轴定位的力量的分子机制.
主要方法:
- 在单细胞C. elegans胚胎中利用紫外线激光分解中心体.
- 分析碎片速度的平均值和差异,以推断力动态.
- 研究了异构三元氨酸核酸结合蛋白 (G蛋白) α子单元在力量生成中的作用.
主要成果:
- 导致螺旋位移的力失衡归因于与前相比,作用于后微管的力发生器数量较多,作用于前微管.
- 激活G蛋白α子单元对于产生驱动轴定位的天体力量至关重要.
结论:
- 通过G蛋白信号介导的不对称力生成是C. elegans中不平等细胞分裂期间异常螺旋定位的主要机制.
- 这一发现为细胞不对称性的生物物理调节及其发展后果提供了关键的见解.
相关概念视频
Torque On A Current Loop In A Magnetic Field
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Electric Generator: Alternator
Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
Control of Power Flow
There are several methods to control power flow in power systems:
Generator Voltage Control
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
Turbine-Governor Control
Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
Load-frequency control
Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...


