Mix the amount of yeast you are going to use with about a half of a cup of lukewarm (not hot) water, and a couple tsp of sugar. If the yeast is still usable, it will become activated and start to bubble and foam up.
is there a test to see if yeast is still good
Put a little of the yeast in a glass of warm water. If you see tiny bubbles, the yeast is still good. If not, adding the dead yeast will not make the dough rise.
Probably not. To test it, heat about 1 cup (250 ml) of water to about 115F (40C) and then dissolve about 1 teaspoon (5 gm) white sugar in it. Add about 1 teaspoon of your yeast and let it sit for about five minutes. If its good you should see it foaming away. Do not over heat the water or you WILL kill the yeast and you'll never know if your yeast is good or not.
You can use yeast as an indicator to test for sugar in a material by observing if the yeast produces carbon dioxide gas when exposed to the material. Yeast consumes sugar to produce carbon dioxide during fermentation. If the material contains sugar, the yeast will produce carbon dioxide, causing bubbling or foaming to occur.
Never tried it, but, hey, try it and see what happens! The worst that could happen is you have raised, "bready", yeasty buns! They still would be good.
If still experiencing discharge after a yeast infection was supposed to clear, it's important the individual see a doctor right away!
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If it has your money, then it is good. If it is in PMITA prison, it is not.
No because you dissolve the yeast in water.
Ancient Chinese used red yeast rice, still the basis for Mevastatin. Red yeast rice is now ruled illegal for sale by the FDA..... See: http://en.wikipedia.org/wiki/Statin
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If yeast does not proof, it may be expired or inactive. Start by checking the expiration date and ensure it's stored properly. You can try using fresh yeast or proofing it in warm water with a bit of sugar to see if it activates. If it still doesn't bubble or froth after about 10 minutes, it's best to start over with new yeast.