slopes

My understanding is that the reason the wort used in slants should be boiled in a pressure cooker under 15PSI of pressure is to raise the temperature high enough to kill botulinum spores. I've only made a couple of batches of slats so far and as I don't have a pressure cooker I've just boiled...

I have a small collection of yeast cultures that I keep on slants. Some of them are getting on for 6 months old and I'd like to restreak them onto fresh slants to keep the strain going. Is it fine to just transfer and streak directly from the old slant onto a new one? Will the viability of...