Physiology and biochemistry in modern medicine . ked variations in the units of which different proteins arecomposed. If any one of these units should be essential for growth and 576 METABOLISM the organism be unable to manufacture the missing unit for itself, itis clear that growth could not proceed however much protein not contain-ing the necessary unit we might feed to the animal. It is an applicationof the law of the minimum, and is analogous with the failure of growthwhich has long been known to ensue when certain inorganic substancesare withheld from the growing animal. A diet might be p
Physiology and biochemistry in modern medicine . ked variations in the units of which different proteins arecomposed. If any one of these units should be essential for growth and 576 METABOLISM the organism be unable to manufacture the missing unit for itself, itis clear that growth could not proceed however much protein not contain-ing the necessary unit we might feed to the animal. It is an applicationof the law of the minimum, and is analogous with the failure of growthwhich has long been known to ensue when certain inorganic substancesare withheld from the growing animal. A diet might be perfectly bal-anced as judged by comparison of the nitrogen intake and output, andyet if it should fail to contain even one of the essential units and theorganism should be incapable of supplying this unit, then would thediet be inadequate for growth. These important facts are the outcome of modern work, and theyhave been established by observations on the growth of young animalsfed with a basal ration to which were added mixtures of amino acids.
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