Nitrogen - Nitrogen is used in the creation of new yeast cell walls.
Oxygen - Oxygen is needed by the yeast during the initial fermentation to grow rapidly.
Micro-nutrients - Various elements and amino acids needed by the yeast. These would be things like phosphorous and citric acid.
 Beer Yeast Nutrient additives
Wort typically has enough nutrients that adding nutrients is not done.
 Wine and Mead Nutrient additives
Wine and mead typically do not have enough nutrients on their own to produce a good end result.
DAP - Diammonium Phosphate
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