In the present research work was to examine the possible antioxidant activities of the aqueous and ethanol leaf extract of Rhinacanthus nasutus (Linn.) Kurz. DPPH, Hydroxyl radical scavenging and reducing power assays were employed. The results showed that the DPPH activity of aqueous and ethanol leaf extract at the dose of 50μg/ml has exhibited in 63.81±0.013 and 79.36±0.028 inhibition with an IC50 value of 21.39 and 29.41μg/ml. The highest Hydroxyl radical scavenging activity showed aqueous and ethanol leaf extract at the dose of 50μg/ml has exhibited in 96.18±0.029 and 121.23±0.081 inhibition with an IC50 values of 30.19and 41.39μg/ml, the reducing power assay aqueous and ethanol leaf extract showed the 0.59 and 0.71 absorption at 700 nm extract at the dose of 50μg/ml suggested that promising antioxidant activity of crude aqueous and ethanol extract could be used as a source of natural antioxidants of R. nasutus and needs further studies to bring new natural products into pharmaceutical industries.

The methanolic rhizome extract of A. calcarata was evaluated for its antibacterial activities against five bacterial strains Pseudomonas aeuroginosa, Proteus vulgaris, Salmonella paratyphi, Bacillus thurungiensis and Staphylococcus faccealis. The extract has inhibited all the tested bacterial species with different manner at various concentration. However the higher level zone of inhibition in 400 (mg/ml) is significant against all the above said bacterial strains of these Salmonella paratyphi. Based on the present study it can be conculuded that the plant rhizome possess potent anti bacterial activity.

The present study investigates the antibacterial activity of various solvents leaf extracts of Strychnos nux vomica against four different bactria strains like Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa, Salmonella paratyphi b, Alternaria alternate, Aspergillus flavus, Penicillium notatum and Cladosporium carrionii. All the results were compared with respective positive control.

Berries of Vaccinium species have been a source of food and pharmaceutical ingredients. The ethanol, methanol and chloroform extracts of Vaccinium leschenaultia was investigated for anti-inflammatory activity. All the extracts (150 and 300mg/kg each) were found to significantly (P<0.05) inhibit paw edema induced by carrageenan in rats. The results indicated that the methanol extract with the dose of 300mgkg-1 b.w. and the chloroform extract with the dose of 300mgkg-1 b.wt. showed maximum anti-inflammatory activity as compared to the reference drug, Indomethacin. V. leschenaultia could be used as a potential source of antiinflammatory agent.

The present study was evaluated the antibacterial and antifungal activity of various extracts of S.gardneri against four different bactria and fungal strains like Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa, Salmonella para typhi b, Alternaria alternate, Aspergillus flavus, Penicillium notatum and Cladosporium carrionii. All the results were compared with respective positive control.