Table of symbols

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