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Lab 8
Centrifugation
22
Biology
Undergraduate 3
03/05/2012

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Term
Centrifugation
Definition
used to seperate and isolate particles, increases the rate of settling particles by messing with gravity, increasing the gravitational effect.
Term
rotor
Definition
has cavities, what spins greatly increases force on particles, cause rapid movement to bottom
Term
W
Definition
angular velocity
Term
Relative centrifugal force
Definition
equal to a ratio between actual centrifugal force equal to ratio b/w actual centrifugal force and corresponding gravitational forces.
Term
The force on a particle during centrifugation
Definition
F=m(W^2)(x)
Term
g
Definition
gravitational constant m x g- gravitational force experienced by a particle.
Term
sedimentation rate
Definition
how quickly particles will settle to the bottom of a tube.
Term
3 forces that determine sedimentation rate
Definition
Centrifugal force, buoyant force, and frictional force.
Term
Stokes Law
Definition
the frictional force that resides the sedementation of a sphere through a liquid at cm/s. V- velocity, r-radius
Term
Sedimentational coefficient
Definition
rate at which the particle sentiments under conditions of 'unit acceleration' this is a sviedberg unit
Term
preparative centrifugation
Definition
use of a centrifuge to isolate subcellular components for further analysis.
Term
Three types of rotors
Definition
swinging-bucket, fixed angel, vertical tube.
Term
supernatant
Definition
the clarified liquid above the pelleted particles seperated.
Term
differential centrifugation
Definition
differences in particle sedimentation rates are the basis of the separation from each other.
Term
4 classical differential fractions
Definition
Nuclear, mitochondrial, microsomal, and soluble phase-cytosol.
Term
density gradient centrifugation
Definition
even greater purity
Term
density gradients
Definition
a column of liquid whose density increases from top to bottom.
Term
Three major categories of gradients
Definition
1-step- discontinuous gradients, 2-continuous- linear and exponential gradients 3- self forming gradients.
Term
Limits are places in chambers called...
Definition
resivoures and mixing chambers.
Term
Solute concentration and density equation
Definition
given by the C equation
Term
Isotopic separations
Definition
Seperation determined by particle density values.
Term
Rate separations.
Definition
Seperation represents particle seperation rate differences. Weight
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