Cobalt transport in a cobalt-resistant strain of Neurospora crassa.

Uptake of Co2+ by cobalt-resistant strain is dependent on Co2+ concentration in the medium and is linear with time. The uptake is unaffected by metabolic inhibitors and decreased at low pH values. The uptake is independent of temperature in the range 0–40° C. The transport system is a passive diffusion process, unlike in the parent wild type strain where it is energy-dependent. It is possible that Mg2+ transport system is not involved in Co2+ transport in this strain, since the Co2+ uptake is not suppressed by Mg2+ as in the parent strain.