| Symbol
|
Description
|
Units
|
| g
|
grams
|
g
|
| l
|
liters
|
l
|
| ml
|
mililiters
|
ml
|
| poise
|
units of viscosity
|
poise
|
| °C
|
degrees Celsius
|
°C
|
| °K
|
degrees Kelvin temperature
|
°K
|
| T
|
temperature
|
°C or °K
|
| m
|
meters
|
m
|
| cm
|
centimeters
|
cm
|
| s
|
Sedimentation Coefficient
|
sec
|
| s*
|
s star, apparent sedimentation coefficient
|
sec
|
| s20W
|
s-20-w, sedimentation coefficient corrected to 20 degrees C in pure water (but not corrected for solute concentration)
|
sec
|
| s°
|
s-zero; sedimentation coefficient corrected to zero solute concentration
|
sec
|
| s°20w
|
s-zero-20-w; sedimentation coefficient corrected to 20 degrees C in pure water and also corrected for solute concentration
|
sec
|
| smax
|
The maximum sedimentation coefficient assuming that the sample is an anhydrous sphere
|
sec
|
| f
|
Frictional coefficient (may inherit subscripts etc. from s)
|
g (sec)^(-1)
|
| k
|
An empirical constant that takes into account the effect of sample concentration on s
|
l/g
|
| σ
|
sigma, reduced apparent molecular weight
|
cm^(-2)
|
| JD
|
flux due to diffusion
|
g (cm^(-2)) (sec^(-1))
|
| D
|
diffusion coefficient
|
cm^(-2) sec^(-1)
|
| D0
|
Maximum diffusion coefficient assuming the protein is an anhydrous sphere
|
cm^(-2) sec^(-1)
|
| Js
|
Flux due to sedimentation
|
g cm^(-2) sec^(-1)
|
| R
|
Gas constant 8.3144*10^7 in cgs
|
g mole^(-1) °K ^(-1)
|
| N0
|
Avogadros number 6.023*10^23
|
mole^(-1)
|
| N
|
Number of residues
|
unitless
|
| c
|
weight or mass concentration
|
g/l
|
| c(r)
|
function of concentration at radial position r
|
g/l
|
| C
|
Molar concentration
|
mole/liter
|
| ω
|
Radial velocity (usually of centrifuge rotor)
|
sec^(-1)
|
| Mr
|
Molecular weight
|
g mole^(-1)
|
| Mp
|
Molecular weight of a protein in a complex
|
g mole^(-1)
|
| Md
|
Molecular weight of a denaturant in a complex
|
g mole^(-1)
|
| ρ
|
density (usually of buffer)
|
g/ml
|
| vbar
|
partial specific volume
|
ml/g
|
| η
|
viscosity
|
poise
|
| R0
|
Radius of anhydrous sphere computed from molecular weight and vbar
|
cm
|
| Rp
|
Radius of anhydrous sphere computed from molecular weight and Perrins empirical formula
|
cm
|
| Rs
|
Stokes radius
|
cm
|
| a/b
|
ratio of axial lengths in a model of an asymmetrical oblate or prolate
|
unitless
|
| δ1
|
degree of hydration
|
unitless
|
