Meaning & History. Derived from the name of the Jordan river in Israel, which is derived from yarad meaning descend or flow down.eaning & History. Derived from the name of the Jordan river in Israel, which is derived from yarad meaning descend or flow down.
First, the glucose is broken down. Scientists refer to this step as glycolysis. Then, the second process, aerobic respiration breaks the remains of the glucose down further. During aerobic respiration, oxygen is reduced, donating an electron to hydrogen to form water. The entire process of cellular respiration oxidizes glucose.
This process can occur only in the presence of oxygen when no alternative energy source (that is, no fermentable sugar) is available. Fortunately, our yeast does not normally get the chance to oxidize ethanol to acetic acid because by the time all the sugar is gone and ethanol is available for respiration, no dissolved oxygen is left in solution.