Publications

Publications serve as the concrete art form for the scientist. It is his modus operandi. Authorship is akin to success and achievement. It cannot and should not deteriorate into a bargaining tool or commodity. Dardik
Lourens, A.C.U., Van Vuuren, S.F., Viljoen, A.M., Davids, H., Van Heerden, F.R. 2011. Antimicrobial activity and in vitro cytotoxicity of selected South African Helichrysum species. South African Journal of Botany 77: 229-235.

The antimicrobial activity of chloroform: methanol (1:1) extracts of thirty-five indigenous South African Helichrysum species was determined against six micro-organisms. Seven of the screened extracts exhibited minimum inhibitory concentration (MIC) values lower than 0.1 mg/ml against Bacillus cereus and/or Staphylococcus aureus. The in vitro cytotoxicity (against Graham cells, MCF-7 breast adenocarcinoma and SF-268 glioblastoma cells) of these extracts was also determined at a concentration of 0.1 mg/ml using the sulforhodamine B (SRB) assay. Several of the extracts screened caused significant growth inhibition of both the "normal” and cancer cell lines at the concentration tested.



Helichrysum cymosum | Asteraceae | flowers | botanical - Harold Porter Botanical Garden, Betty's Bay, Western Cape, South Africa [2008 © alvaroviljoen.com]