What is alkaline reversion?
Alkaline reversion is a condition in which the medium turns yellow during the first part of the incubation period and then changes to red later due to increased alkalinity by ammonia produced as proteins degrade.
Alkaline reversion happens when microbes metabolize all the sugar with production of acid, then with continued incubation, the amino acids in peptones are metabolized and ammonia may be released as a waste. this in turn reacts with water in the medium to form the base ammonium hydroxide, an alkaline waste, which neutralizes the acid and elevates the pH So the way to avoid alkaline reversion is to elliminate the microbe concerned.
Why doesn't the theory of averages work for investing in the Dow Jones Industrial Average or the Standard Poor's 500-stock Index?
I have no clue what you mean by the "Theory of Averages." If you are asking about "mean reversion" then the answer is that trading costs and capital limitations tend to prevent you from using strict mean reversion. There's also the question of what mean you are expecting to see reversion to, and how long you are willing to wait. You might wait 5 or six years for a mean reversion move out of the…