Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
When the US National Institutes of Health get a new leader, important decisions will have to be made about funding strategies and research support if they are to continue as a paradigm of scientific excellence.
Dr Peter Duesberg, the virologist-turned-campaigner, is wrongly using tendentious arguments to confuse understanding of AIDS and those in danger of contracting the disease. He should stop.
Cytotoxicity is defined as the in situ measurement of cellular function in response to a toxic substance. Cytotoxicity assays are widely used in drug screening and development research to minimize the number of compounds on which expensive mammalian animal model toxicology studies are performed.
Tools for the microbiologist featured this week include an all-in-one instrument for processing media and autoclaving labware, viral swab transport systems, a portable microplate reader, culture collections and safety videos.
