Laboratory centrifuge separation method is different, and the application is not the same. 1. Differential centrifugation: Many bioactive macromolecules and subcellular organelles are unstable and require low-temperature high-speed centrifugation. The most common method is differential centrifugation. After centrifugation, the supernatant is poured out and the precipitate is separated. The separated supernatant is then centrifuged at a higher speed to separate the second part of the precipitate, so that the rotation speed is continuously increased and the desired substances are separated step by step. This method can effectively separate particles with large differences in size, but can not separate particles of similar size, and the separated components are often non-uniform, mixed with other types of particles. 2. Zone centrifugation: It can be divided into two types: velocity zone centrifugation and isodensity velocity zone centrifugation. 1) Velocity zone centrifugation: This is to place a small amount of suspension on a gentle density gradient and use this gradient to stabilize the sedimentation of the particles. Due to centrifugation, the particles move away from the initial zone, and the speed of the movement is determined by the size, shape, and centrifugal force of the laboratory centrifuge they are subjected to. After centrifuging for a period of time, the various granules will move in accordance with their relative velocities and separate into a series of zones. In this way we can use particles with a settling velocity difference of 20% or more. 2) Iso-density zone centrifugation: This is the suspension of the particles to be separated onto the density gradient, or the particles are actually dissolved in a gradient solution. By centrifugation, the particles either float or sink to the same density as their own liquid where they have no weight and no matter how long it takes to centrifuge, they do not move anymore. These particles can become a series of zones, each in its own density zone. Therefore, this is a method for separating the particle size using the particle floating density. The medium used is usually cesium chloride (Cscl) and barium sulfate (Cs2SO4). The former is suitable for DNA isolation and the latter is suitable for RNA isolation. Compared with the rate centrifugation method, this method has a major drawback. During centrifugation, the particles are inevitably exposed to a high concentration of gradient solution, causing partial damage to the particles and possible damage to the particles. Some extra zones Automatic Sliding Door Operators High quality door residential automatic door opener
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Safety & Operation Devices of High Speed PVC Roll up Door:
In consideration of operation safety for high speed PVC roll up door, we provide the photo cell, and wireless safety airbag device as the standard safety device; And to enrich the operation methods of the high speed door, various options are provided such as manual button, transmitter, control box, radar sensor and inductive loop device. Different styles of transparent window are also available for better vision view.
Varied Running Speed of High Speed PVC Roll up Door:
Running speed of High Speed PVC Roll up Door is adjustable: Opening speed from 0.80m/s to 2.0m/s, and closing speed from 0.6m/s to 1.0m/s. Running speed adjustment can be achieved through inverter inside the control box, t to meet the actual needs.
Driving System of High Speed PVC Roll up Door:
Driving system is the core part for the high speed roll up doors. For the motors, we can provide multiple options for different demands, brands including SEW, SIEMENS, SNMA, SEJ and Servo Motor; All the motors are provided with manual brake, that offers emergency operation under power failure. Furthermore, motor power can be applied based on the real door size, in supply voltage 220V single phase and 380V three phase.
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