Table 1.

Cutoff Effects on the Electrostatic Interaction Energies for Both Urea and Water in Bulk

(a) Pure 8 M Urea
	urea		water
cutoff Å	electrostatic	Vdw	electrostatic	Vdw
8	−16.7	−7.7	−18.9	1.31
10	−17.4	−8.3	−19.6	1.20
12	−18.7	−8.5	−20.1	1.15
20	−21.3	−8.7	−20.2	1.10
80	−20.1	−8.8	−21.4	1.10

(b) Lysozyme in 8 M Urea
	urea		water
cutoff Å	electrostatic	Vdw	electrostatic	Vdw
8	−13.11	−6.37	−15.39	0.98
10	−15.77	−6.82	−17.66	0.90
12	−16.36	−6.99	−18.22	0.81
20	−20.75	−7.19	−18.63	0.76
80	−20.70	−7.22	−20.44	0.77