Table 1.

Parameters derived from SAXS

		Guinier			GNOM
Sample	Conc.a (ng/µl)	qRg	Rg (Å)	I(0) (a.u.)	qb	Rg (Å)	I(0)	Dmax (Å)
APS BioCAT
+A Group II Intron	100	0.98–1.3	73.5 ± 0.8	324.0 ± 3.0	0.006–0.37	74.9	326.2	250
	50	0.47–1.3	75.3 ± 0.9	139.0 ± 1.0	0.006–0.37	72.7	133.0	225
	40	0.45–1.3	73.0 ± 1.0	120.2 ± 1.0	0.006–0.31	72.4	116.0	225
	Inf. dil.	0.57–1.2	73.3 ± 0.9			73.3		235
NSLS X9
+A Group II Intron (DII-tRNA)	100	1.0–1.4	87.3 ± 1.2	131.7 ± 2.1	0.010–0.25	95.1	125.0	284
CHESS F2c
+A Group II Intron
0% Sucrose	40	0.71–1.3	71.2 ± 4.4	0.53 ± 0.03	0.0097–0.15	70.7	0.52	235
16.5% Sucrose	60	0.89–1.7	86.6 ± 3.9	0.70 ± 0.04	0.0097–0.15	83.8	0.64	235
32.5% Sucrose	50	1.09–1.9	105.8 ± 8.3	0.52 ± 0.06	0.0097–0.10	92.9	0.42	235
48.8% Sucrose	100	1.19–2.1	115.2 ± 5.6	0.87 ± 0.07	-n.d.-	-n.d.-	-n.d.-
65% Sucrose	50	1.22–2.2	118.6 ± 11.8	0.41 ± 0.07	-n.d.-	-n.d.-	-n.d.-

^aWhere q = 4πsinθ/λ, where 2θ is the scattering angle, in units of Å^-1.

^bAs determined by U.V. absorbance.

^cI(0) in units of (cm^-1)