The most critical barrier for curing HIV - 1 infection is the presence of the viral reservoir, the cells in which the HIV virus can lie dormant for many years and avoid elimination by antiretroviral drugs. (sciencedaily.com)
3a) Innovative Fuel Cell Membrane R&D - non-polyfluorosulfonic acid and high temperature membrane types to address critical barriers and increase performance and durability while meeting cost targets. (energy.gov)
Predatory pricing could, in turn, help Amazon buttress its other critical barrier to entry into the e-book marketplace: its use of a proprietary e-book format, rather than the industry - standard epub format. (darcypattison.com)