CONTENTS \ LE 
Introduction to Conference Se! NAR NSeee 
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PART ONE — OCCURRENCE OF FREE AMINO ACIDS 
I. Analytical Methods 
Identification of the elusive amino acid 
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Discussion 
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II. Plants 
The soluble, nitrogenous constituents of plants 
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Some recently-characterized amino acids from plants 
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y-Glutamyl] peptides in plants (Invited Discussion) 
by J. F. THomeson, C. J. Morris, W. N. ARNOLD AND D. H. TURNER (Ithaca, N.Y.) . 54 
Free amino acids in normal and malignant plant tissues grown in tissue culture (Invited 
Discussion) 
by D. G. SIMONSEN AND E. Roserts (Duarte, Calif.), AND P. R. WuiteE (Bar Harbor, Me.) 65 
The use of 14C-labeled compounds in metabolic studies: effects due to autoclaving !C-urea 
(Invited Discussion) 
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Discussion 
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III. Microorganisms 
The composition of microbial amino acid pools 
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Free amino acids in protozoa 
by J. B. LoEFER (Pasadena, Calif.) anD O. H. SCHERBAUM (Los Angeles, Calif.). . . . 109 
IV. Insects 
Free amino acids in insects 
by P. S. CHEN (Zurich) Saat avout 115 
Amino acids and derivatives in Dyosophila 
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Metabolism of peptides in Drosophila 
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Discussion 
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V. Comparative, Developmental and Evolutionary A spects* 
Free amino acids in invertebrates: a comparative study of their distribution and metabolism 
by J. AwaparRa (Houston, Texas) eMac iisuhsiek  Seyes 158 
Free amino acids of marine invertebrates (Invited Discussion) 
by J. S. KittrepGE, D. G. SImonsEN, E. ROBERTS AND B. JELINEK (Duarte, Calif.) . . 176 
Lombricine and serine ethanolamine phosphodiester (Invited Discussion) 
by A. H. ENNor AND H. RosENBERG (Canberra, Australia) ........... . 187 
Discussion 
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VI. Vertebrates 
The free amino acids of body fluids and some hereditary disorders of amino acids metabolism 
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* A paper by Dr. STANLEY L. MILLER entitled: ‘Synthesis of amino acids in the primitive 
earth”’ was read at the conference but is not represented by an article in this volume. 
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