Australia's Science Forum

Hi. In the transcript of the Southern Biological tutorial, it says 1% agar and 0.1% NaHCO3. I've tried that and it works really well.
Sandra

The pH of household materials such as lemon juice, vinegar, cloudy ammonia etc is colourful. You could make up red cabbage indicator too, if you liked. Precipitation pracs are colourful. Combinations of 0.1M lead nitrate, potassium iodide, copper sulphate and sodium hydroxide are good - all but one ...

P.S. Don't forget to treat the water with water ager to get rid of chlorine and chloramines.

If you wash and freeze some endive, you can break little bits off to feed them. They really like that. Scoop out any excess and replace every couple of days. We didn't have aeration. Just replace a third or so of the water once a week. They need to be able to get out of the water when they develop l...

Hi Rob. I would like a copy of your risk assessment too please. My fax is 03 52779884. Thanks in anticipation
Sandra

We do a similar prac. Junket tablets are very hard to come by these days, but Southern Biological sells junket powder. The culture we use is Streptococcus lactis, but we've had it a long time and I don't think Southern Biological routinely stock it. They may be able to suggest an alternative. Otherw...

And they're entirely portable!

We use hand operated vacuum pumps (originally bought for E coli determination). They are in the current Science Supply catalogue on page 89. They aren't cheap, but ours have lasted twenty years and are still going strong.

Hi Laurina. You said you used 10mL borax to 250mL water. I'm not aware of liquid borax. Did you mean 10g? I think that 4%, so you should be right. It takes a bit of dissolving in cold water. I dissolve it in half the quantity of boiling water, then add cold water. I always use Aquadhere (unfortunate...

I have had luck with a couple of lemons in series and a digital stopwatch.