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By Roland A. Coulson, Thomas Hernandez

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Extra info for Alligator Metabolism Studies on Chemical Reactions in Vivo

Example text

1. 4. To convert 0 2 usage to glucose oxidation, divide the μτηο\ of glucose used by 6. 56 μηιοΐ/ml). 047 ml/g/min for the entire body and 2/3 that per gram for resing muscle. It is assumed that 0 2 consumption of muscle working maximally increases 30-fold over that used at rest. Í This represents a "corrected" rate of blood flow for the alligator. The actual rate would be about twice these figures to compensate for a low blood hemoglobin (see text). These values are for a 700 kg alligator. * At any one substrate concentration, the velocity of a reaction will be proportional to the A-V difference, and the quantity reacted during unit time will be the A-V difference times the blood flow (F).

1 mmol/g/min. 5 mmol/g/min. In other words, the dry weight of the glucose absorbed/min would approach half the dry weight of the transporting mucosa of the small intes­ tine. It would be difficult not to conclude that the ex­ pression for transport of a food metabolite across the gut mucosa or across other cell membranes should resemble that for enzyme reactions generally. If trans­ port involves a carrier molecule, the rate of formation of the complex, and the subsequent rate of its break­ down should be proportional to blood flow and to the substrate concentration.

Let us next assume that in deamination of amino acid A either the formation of the £ 5 complex or its breakdown is indeed rate-limiting at any one blood flow rate but that the actual velocity of the rate-limit­ ing reaction has no upper limit since it may be in­ creased by increasing the blood flow. N o w if one of the reactions is also rate-limiting (at the same blood flow) in the deamination of a second amino acid, B, but the rate constant Κ for the rate-limiting reaction of Β is half that of A, increasing the blood flow will increase the rate of deamination of both amino acids without limit, but amino acid A will still be deaminated twice as fast as B.

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