Subject Index 



Acetabularia, 



incorporation of amino acids into 



nuclear proteins in, 98, 99 

 interspecific grafts in, 113 

 RNA, 



content in nucleolar, correlated 



to growth, 5 

 and protein synthesis after enu- 

 cleation, 108-125 

 Acid phosphatase, 106, 120 

 Adenine, 



effects of, on growth in Acetab- 

 ularia, 115 

 incorporation, into RNA, 

 after enucleation, 104,105, 114, 



127 

 of RNase-treated roots, 37 

 Adenosine triphosphate (ATP), 

 content, after RNase treatment of 



cells, 37, 39 

 as energy source, 



for amino acid incorporation into 



proteins, 44-46, 47 

 for RNA and protein synthesis, 

 23, 24, 30 

 Adenosine triphosphatase (ATPase), 



45, 106, 107 

 Adenylic acid, 46 

 Alanine, in vitro incorporation, in 



microsomes, 21 

 Aldolase, synthesis, in enucleated 



Acetabularia, 119, 120 

 Amino acids, 

 analogues, 18 



incorporation into proteins, 

 of disrupted cells, 30, 31 

 after enucleation, 107, 120, 121, 



125 

 gradients of, during develop- 

 ment, 65 

 mechanism, 44-46 

 of microsomes, 20, 21 

 nuclear, 99, 100 



nucleolar, 98, 99 



parallelism between, and RNA 



content, 6 

 of protoplasts, after RNase 



treatment, 32 

 in RNase-treated cells, 34-42 

 Amoeba discoides, 101 

 Amoeba proteus, 



effects of RNase on living, 38-40 

 incorporation of amino acids into 



nuclear proteins in, 99 

 RNA and protein synthesis in enu- 

 cleation experiments in, 100-108 

 Amphibian eggs, 



antimitotic activity of RNase on, 



34,41 

 experimental modification of RNA 



synthesis in, 67-80 

 RNA distribution in, 60-67 

 Amylase, 20, 24, 106, 107 

 Anaerobiosis, 44 

 Analogues, chemical, inhibition of 



development by, 67, 68 

 Antibiotics, dissociation of protein 

 and RNA synthesis by, in micro- 

 organisms, 8 

 Antibodies, labeled, in induction, 83 

 Antimitotic activity, of RNase, 41, 42 

 Ascites tumor cells, 



action of RNase on, 34, 41 

 incorporation of amino acids into 

 proteins in vitro, 23 

 ATPase (see Adenosine triphospha- 

 tase) 

 ATP (see Adenosine triphosphate) 

 Aureomycin, 8 

 " Autoradiography, 



on amino acid incorporation into 



cytoplasmic proteins, 34, 39, 40 

 on CO2 incorporation during nu- 

 clear differentiation, 89 

 on diffusion of ribonucleoproteins 

 of organizer, 82 



