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View Diary: BREAKTHROUGH: Gasoline, diesel, & jet fuel made from biomass (104 comments)

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  •  If you read the white paper (2+ / 0-)
    Recommended by:
    Jimdotz, Stranded Wind

    closely, they still need sugar and/or starch for initial input, as shown on the flowchart.  That's grain and/or sugar, in other words, food.

    Not as hot as it sounds.

    Warmest regards,

    Doc

    In do not know everything, but I can learn anything. -6.25, -6.05

    by Translator on Fri Sep 19, 2008 at 11:22:08 AM PDT

    •  Cellulose is a starch. And you can't eat it. (3+ / 0-)
      Recommended by:
      polecat, mikolo, Stranded Wind

      Cellulose is a starch in this context.

      If you don't stand for something, you'll stand for anything.

      by Keith Pickering on Fri Sep 19, 2008 at 11:26:36 AM PDT

      [ Parent ]

      •  Not according to their white (3+ / 0-)
        Recommended by:
        wystler, Wee Mama, Stranded Wind

        paper.  They specifically mention sugars and starches from cane, beets, and some weasel words for grain.  And cellulose is NOT starch.  Completely different linkages between glucose units, which is why it has been so difficult to convert all along.  Cellulose is not starch, otherwise yeast would break it down, which they do not.

        Facts matter.

        Doc

        In do not know everything, but I can learn anything. -6.25, -6.05

        by Translator on Fri Sep 19, 2008 at 11:29:12 AM PDT

        [ Parent ]

        •  Cellulose is starch (0+ / 0-)

          Wikipedia - cellulose is starch with a different linkage between subunits and extensive crosslinking. Because molecular bonds matter.

          Cellulose is an organic compound with the formula (C6H10O5)n, a polysaccharide consisting of a linear chain of several hundred to over ten thousand β(1→4) linked D-glucose units......Cellulose has no taste, is odourless, is hydrophilic, is insoluble in water and most organic solvents, is chiral and it is biodegradable.

          Cellulose is derived from D-glucose units, which condense through β(1→4)-glycosidic bonds. This linkage motif contrasts with that for α(1→4)-glycosidic bonds present in starch, glycogen, and other carbohydrates. Cellulose is a straight chain polymer: unlike starch, no coiling occurs, and the molecule adopts an extended and rather stiff rod-like conformation. The multiple hydroxyl groups on the glucose residues from one chain form hydrogen bonds with oxygen molecules on another chain, holding the chains firmly together side-by-side and forming microfibrils with high tensile strength. This strength is important in cell walls, where they are meshed into a carbohydrate matrix, conferring rigidity to plant cells.

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