Symbol Equation
a		Radius of DNA in cylindrical model
b		Axial charge separation in cylindrical model of DNA
R		Gas constant, 1.9859 (cal K−1 mol−1)
T		Temperature
∣ZD∣		Number of phosphate charges in DNA oligomer
Gcoul		Coulombic Gibbs free energy
$G_{\mathrm{u}}^{\text{coul}}$	Gcoul/∣ZD∣	Coulombic Gibbs free energy per phosphate charge
$G_{\mathrm{u},\infty }^{\text{coul}}$	${\text{lim}}_{\mid Z_{\mathrm{D}}\mid \to \infty }{G}_{\mathrm{u}}^{\text{coul}}$	Polymeric limit of Coulombic Gibbs free energy
ncoul	−(RT)−1∂Gcoul/∂ln C	Salt ion association
Tm		Transition temperature
STm	dTm/dln C	Salt-dependence of transition temperature
Kobs		Observed equilibrium constant
$\Delta G_{\text{obs}}^{°}$	−RTln Kobs	Standard free energy change
SKobs	∂ln Kobs/∂ln C	Salt-dependence of equilibrium constant
Coefficients of DNA oligomeric model at C = 0.15 M
Ne		Characteristic length of CEE
Gu,0	${G_{\mathrm{u}}^{\text{coul}}\mid }_{\mid Z_{\mathrm{D}}\mid }=0$	Per phosphate free energy of oligomer at ∣ZD∣ = 0
${\mathcal{G}}_1$	${\phantom{\mid }\frac{\partial G_{\mathrm{u}}^{\text{coul}}}{\partial \mid Z_{\mathrm{D}}\mid }\mid }_{\mid Z_{\mathrm{D}}\mid =0}$	First ∣ZD∣-derivative of per phosphate oligomer free energy at ∣ZD∣ = 0
Gu,∞	${G_{\mathrm{u}}^{\text{coul}}\mid }_{\mid Z_{\mathrm{D}}\mid =\infty }$	Per phosphate free energy of polymer
2g	$-{\phantom{\mid }\frac{\partial G_{\mathrm{u}}^{\text{coul}}}{\partial (1∕\mid Z_{\mathrm{D}}\mid )}\mid }_{\mid Z_{\mathrm{D}}\mid =\infty }$	Negative first derivative of per phosphate free energy with respect to 1/∣ZD∣ at ∣ZD∣ → ∞
nu,0	${n_{\mathrm{u}}^{\text{coul}}\mid }_{\mid Z_{\mathrm{D}}\mid =0}$	Per phosphate salt ion association of oligomer at ∣ZD∣ = 0
${\mathcal{I}}_1$	${\phantom{\mid }\frac{\partial n_{\mathrm{u}}^{\text{coul}}}{\partial \mid Z_{\mathrm{D}}\mid }\mid }_{\mid Z_{\mathrm{D}}\mid =0}$	First ∣ZD∣-derivative of per phosphate salt ion association at ∣ZD∣ = 0
nu,∞	${n_{\mathrm{u}}^{\text{coul}}\mid }_{\mid Z_{\mathrm{D}}\mid =\infty }$	Per phosphate salt ion association of polymer
2γ	$-{\phantom{\mid }\frac{\partial n_{\mathrm{u}}^{\text{coul}}}{\partial (1∕\mid Z_{\mathrm{D}}\mid )}\mid }_{\mid Z_{\mathrm{D}}\mid =\infty }$	Negative first derivative of per phosphate salt ion association with respect to 1/∣ZD∣ at ∣ZD∣ → ∞