Antimicrobial Activity of Some Important Medicinal Plant oils against Human Pathogens
Essential oil or volatile oils of plants have been variously reported in medicinal applications. The volatile oil extracts of Ocimum sanctum, Ocimum bacillicum and Coleus aromaticus showed significant antibacterial activity against human pathogens such as E.coli, Klebsiella sp. Shigella sp. Bacillus sp. Streptococcus sp. Staphylococcus sp. Proteus sp. and Pseudomonas sp. In this, Coleus aromaticus showed greater effect against all species, especially in Streptococcus sp., 45 mm zone of inhibition was observed; antifungal activity against candida sp. was 30 mm zone of inhibition was observed. The volatile oil extracted from the herbs showed greater effectiveness in the inhibition of the bacterial and fungal culture than the commercial antibiotics. The exact inhibition may be due to individual or synergetic action of active principle present in the volatile oil. 
Screening of medicinal plant extracts for antioxidant activity
The methanol extracts of nine medicinal plants traditionally used in Chinese medicine were screened for antioxidant activity versus resveratrol, which has been shown to protect cells from oxidative damage [Toxicol. Lett. 102 (1998) 5]. Most of the plant extracts used in this study inhibited the H2O2-induced apoptosis of Chinese hamster lung fibroblast (V79-4) cells. 
Extraction methods and bioautography for evaluation of medicinal plant antimicrobial activity
A comparative study on the antimicrobial properties of extracts from medicinal plants obtained by two different methods was carried out. The screening of the antimicrobial activity of extracts from six plants was conducted by a disc diffusion test against Gram‐positive, ‐negative and fungal organisms. 
Anti-microbial Activities of Selected Ghanaian Medicinal Plants and Four Structurally Similar Anti-protozoan Compounds against Susceptible and Multi-drug Resistant Bacteria
Antibacterial resistance is one of the fast rising health concerns globally. WHO emphasized the need for development of new drugs to combat antimicrobial resistance. 
A Review on Ethnobotanical Study of Traditional Medicinal Plants Used for Treatment of Liver Problems in Ethiopia
Traditional medicinal plants are used for human ailments treatment throughout the world primary health care need practiced typically liver problems by indigenous medical practitioners. 
 Kalaivani, R., Devi, V.J., Umarani, R., Periyanayagam, K. and Kumaraguru, A.K., 2012. Antimicrobial Activity of Some Important Medicinal Plant oils against Human Pathogens. Journal of Biologically Active Products from Nature, 2(1), pp.30-37.
 Lee, S.E., Hwang, H.J., Ha, J.S., Jeong, H.S. and Kim, J.H., 2003. Screening of medicinal plant extracts for antioxidant activity. Life sciences, 73(2), pp.167-179.
 Nostro, A., Germano, M.P., D’angelo, V., Marino, A. and Cannatelli, M.A., 2000. Extraction methods and bioautography for evaluation of medicinal plant antimicrobial activity. Letters in applied microbiology, 30(5), pp.379-384.
 N. Antwi, A., A. Owusu, K. B., Amoa-Bosompem, M., B. Williams, N., Ayertey, F., Akyeh, L., Agyapong, J., Tetteh, T., I. Djameh, G., Botchie, S. K., Azerigyik, F., Ablordey, A., Tung, N. H., A. Appiah, A., Iwanaga, S., Shoyama, Y., Ohta, N., Egyir, B. and Ohashi, M. (2017) “Anti-microbial Activities of Selected Ghanaian Medicinal Plants and Four Structurally Similar Anti-protozoan Compounds against Susceptible and Multi-drug Resistant Bacteria”, European Journal of Medicinal Plants, 20(2), pp. 1-14. doi: 10.9734/EJMP/2017/35437.
 Garedew, B. and Bizuayehu, B. (2018) “A Review on Ethnobotanical Study of Traditional Medicinal Plants Used for Treatment of Liver Problems in Ethiopia”, European Journal of Medicinal Plants, 26(1), pp. 1-18. doi: 10.9734/EJMP/2018/38153.