SUBJECT INDEX
407
Psammechinus miliaris, 182, 326, 328
Pulmonates,
ooplasmic segregation, 3-5
Pyrimidine antagonists,
and egg development, 173
Pyrophosphate,
in lithium-treated eggs, 163
R
Radialization,
of sea urchin, 150, 165, 170, 173
Radiation effects,
on egg development, 126-127
on RNA synthesis, 271
Rana species,
bilateral egg symmetry, 366-367
duration of cleavage, 333, 340
ear differentiation, 351-353
eye lens differentiation, 346
latent differentiation in germ layers,
355-358
lethal hybrids, nucleo-cytoplasmic
interaction in, 327-330
Red blood cell counts,
in chick embryo, 202-203
Reduction gradients, 154-158, 177-182
Respiration (see also Oxygen uptake),
of sea urchin egg, 100-102, 109,
158-160, 165, 168
Respiratory inhibitors,
effect on vegetalization, 160
Reticulocytes,
of chick embryo, 203
Rhizidiomyces,
life-history, 36-37
Rhizophlyctis,
rosea,
life-history, 37-38
Rhodnius prolixus, 102
Rhodopseudomonas,
65
Ribonuclease,
effect on egg development, 264-265,
270
Ribonucleic acid (RNA),
in amphibian eggs, 259-264
developing eggs, 171
egg cortex, 14
fungal spores, 47, 53, 83
ooplasm, 5, 7
sea urchin, 116-118, 123-124, 135
inhibitors, 271
precursors, 123, 273
role in morphogenesis, 290-298
Ribonucleic acid (contd.)
synthesis, effect of thiols on, 287288
synthesis in anucleate algae, 272274
Ribonucleopr o teins,
neural induction by, 265-268
Ribosomes,
blockage of synthetic activity by,
294r-295
function of, 248
in amphibian eggs, 260
in fungal spores, 47, 50, 83
in sea urchin egg, 134-135
nuclear control of, 273
S
Salamander (see also
Ambystoma),
duration of cleavage in, 340-345
ear differentiation, 351-353
germ layer differentiation, 356-358
lethal hybrids, 326-327, 330
yolk-grey crescent in bilateral symmetry, 372
Sand-dollar,
animalization, 165
DNA synthesis in, 120
vegetalization, 162
Sea urchin,
biochemistry of embryonic development, 95-140
cell cleavage and developmental
stage, 336
developmental stages, 148-150
effect of centrifugation on, 363
egg cortex ultrastructure, 364
eggs, subcellular fractionation of,
98-100
experimentally modified morphogenesis, 150-153
hybrids, arrested development in,
125-126, 328, 330
synchrony in cell cleavage, 325
Sea water,
effect on sea urchin homogenates, 97
Skeleton formation,
and protein synthesis in sea urchin,
114
Slime sheath,
of Acrasina, mechanical properties,
308-309, 314
Sphaer echinus, 118, 122, 326
407
Psammechinus miliaris, 182, 326, 328
Pulmonates,
ooplasmic segregation, 3-5
Pyrimidine antagonists,
and egg development, 173
Pyrophosphate,
in lithium-treated eggs, 163
R
Radialization,
of sea urchin, 150, 165, 170, 173
Radiation effects,
on egg development, 126-127
on RNA synthesis, 271
Rana species,
bilateral egg symmetry, 366-367
duration of cleavage, 333, 340
ear differentiation, 351-353
eye lens differentiation, 346
latent differentiation in germ layers,
355-358
lethal hybrids, nucleo-cytoplasmic
interaction in, 327-330
Red blood cell counts,
in chick embryo, 202-203
Reduction gradients, 154-158, 177-182
Respiration (see also Oxygen uptake),
of sea urchin egg, 100-102, 109,
158-160, 165, 168
Respiratory inhibitors,
effect on vegetalization, 160
Reticulocytes,
of chick embryo, 203
Rhizidiomyces,
life-history, 36-37
Rhizophlyctis,
rosea,
life-history, 37-38
Rhodnius prolixus, 102
Rhodopseudomonas,
65
Ribonuclease,
effect on egg development, 264-265,
270
Ribonucleic acid (RNA),
in amphibian eggs, 259-264
developing eggs, 171
egg cortex, 14
fungal spores, 47, 53, 83
ooplasm, 5, 7
sea urchin, 116-118, 123-124, 135
inhibitors, 271
precursors, 123, 273
role in morphogenesis, 290-298
Ribonucleic acid (contd.)
synthesis, effect of thiols on, 287288
synthesis in anucleate algae, 272274
Ribonucleopr o teins,
neural induction by, 265-268
Ribosomes,
blockage of synthetic activity by,
294r-295
function of, 248
in amphibian eggs, 260
in fungal spores, 47, 50, 83
in sea urchin egg, 134-135
nuclear control of, 273
S
Salamander (see also
Ambystoma),
duration of cleavage in, 340-345
ear differentiation, 351-353
germ layer differentiation, 356-358
lethal hybrids, 326-327, 330
yolk-grey crescent in bilateral symmetry, 372
Sand-dollar,
animalization, 165
DNA synthesis in, 120
vegetalization, 162
Sea urchin,
biochemistry of embryonic development, 95-140
cell cleavage and developmental
stage, 336
developmental stages, 148-150
effect of centrifugation on, 363
egg cortex ultrastructure, 364
eggs, subcellular fractionation of,
98-100
experimentally modified morphogenesis, 150-153
hybrids, arrested development in,
125-126, 328, 330
synchrony in cell cleavage, 325
Sea water,
effect on sea urchin homogenates, 97
Skeleton formation,
and protein synthesis in sea urchin,
114
Slime sheath,
of Acrasina, mechanical properties,
308-309, 314
Sphaer echinus, 118, 122, 326