defect surrounded by wine making
Answers:
It is interesting you call it a irregularity.
In small doses many wine lovers see it totalling complexity, and it is an integral part of some classic wines.
Cleanliness contained by the winery, filter and acid stability are methods of controlling the wild yeast Brettanomyces, or "brett" as its familiarly set.
If you want to know about yeasts, including brett, within winemaking see http://winemaking.jackkeller.net/yeast.asp
Other Answers:
Can you state your question more clealy for the family that don't live in your leader?
What is it that you are asking?