3T3 and HeLa cells, grown as a monolayer, have been rapidly frozen by propane jet as a fresh preparation, without pretreatment. In some experiments the frozen cells were fractured at -170 degrees C, t...
A SEM study carried on intra-uterine devices (Dalkon Shield) is reported. The poor manufacturing of the devices is stressed, which could increase their efficiency but also the risks of penetration, or...