Figure 2: Effects of different pretreatment time and wood size on the ethanol (ethanol yield equals (g) ethanol produced/(g) glucan in the un- or pretreated sample/1.111/ ) and glycerol (milligrams of produced glycerol per gram of glucose that can theoretically be produced from the glucan in the treated or nontreated woods) yield of pinewood powder (a) and chips (b).