Table 2.

Effect on rat model of focal cerebral ischemia cerebral homogenate NO and NOS activity ($\overline{x}\pm s$).

Group	n	Dose (mg/kg)	NO (μmol/gprot)	NOS (U/mgprot)
Sham operation group	16		3.11 ± 0.26**	0.52 ± 0.09**
Model group	10		9.17 ± 1.37	1.26 ± 0.12
Nimodipine group	11	20	6.26 ± 0.94**	0.93 ± 0.11**
Cerebral collateral group	12	500	6.00 ± 1.04**	0.84 ± 0.10**
Large dose group of the Rabdosia rubescens total flavonoids	12	200	4.55 ± 0.41**	0.69 ± 0.08**
Middle dose group of the Rabdosia rubescens total flavonoids	12	100	5.54 ± 0.76**	0.76 ± 0.08**
Small dose group of the Rabdosia rubescens total flavonoids	11	50	6.37 ± 0.72**	0.86 ± 0.12**