Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Sour beers are probably the oldest style of brew in the world, but they're just starting to get popular in the States. They were all the buzz at this year's Great American Beer Festival. And with hundreds of brewers now dabbling in sours, it's easier than ever to find them at a local bar or grocery store.
Bacteria tend to become dormant when refrigerated or chilled, thus the conversion of alcohol into acid (vinegar) is halted by chilling. In fact, to create sour beers deliberately, specific strains of bacteria are introduce to produce lactic acid at certainly points in the brewing process.