S U B J E C T I N D E X
767
Neural crest cells,
chemotaxis and, 186
Neuralization,
of ectoderm, 543, 551
without inducer, 5 4 3 - 4
type of, 544
Neural plate,
cultured with ectoderm, 544
induction of, b y dead tissue, 541
induction of, b y primitive streak, 556
Neural (nervous) tissue,
in aggregates o f ectoderm, 506
critical size for, 473
and determination o f somites, 560
differentiation of, 467, 4 7 1 - 2 , 534
induced in ectoderm, 544, 551
Neural tube (see also Neural tissue, Nervous system, etc.),
closing of, 566
differentiation of, 535
incorporation o f glycine by, 570
iodoacetate and, 571
and phenyl alanine analogues, 572
saline extracts of, and induction, 481
Neuraminic acid,
in bone, 372
and sialic acid, 358
Neuraminidase,
and detachment o f cells, 376
Neurites,
contact guidance of, 187
fasciculation of, 194-5
movement of, 181-2, 185
pinocytosis in, 40
ruffles and filopodia on, 179, 195
Schwann cells and, 195
Neurofibrils,
adrenaline and, 616
Neuroglia cells, 148
differentiation of, 173
as mechanocytes or amoebocytes, 159
Neurons (see also Nerve cells),
adrenaline and, 616
ascorbic acid in, 681
heteropyknosis and, 443
neurofibrils in, 616
nucleolar satellites in, 399
sex chromatin in, 400, 443
Neurula, 534
Neutral red,
and macrophages, 166
and osteoclasts, 647
Nicotinic acid (amide),
for cell lines, 281
and insulin, 600
in synthetic media, 115-16, 280
Nicotinamide-adenine dinucleotides, 263
Nitrites,
and inducing agents, 550
Nitrogen,
balance, 279, 281
protein-, as measure o f tissue, 42
storage o f tissues in liquid, 28
Nondisjunction,
frequency of, 414
in mongolism, 410
and multiple X-chromosomes, 406
Notochord,
differentiation of, 5 3 4 - 6 , 558-60
extracts of, 481
incorporation o f glycine by, 570
induced b y bone marrow, 546
as inducing agent, 481
regions producing, 536, 539, 557, 559
Nuclei,
adrenaline and, 616
b o u n d arginine and, 341
differences between, 173, 512
dry-weight of, 220, 333-41
grafting of, 326
incorporation o f cytidine into, 327
membrane of, 205
morphology of, 440, 4 4 3 - 4
nucleic acid content of, 332-41
of plant cells, 338
rotation of, 40, 205
in vitro and in vivo, 173
volume of, 220
Nucleic acids, 3 1 7 - 4 4
aerobic pathways and synthesis of, 255
from amino acids, 300
A T P and synthesis of, 241
autoradiography and, 398
in e m b r y o extract, 35, 256
glucose and synthesis of, 255, 380
from glutamine, 287
measurements of, in cells, 331-40
nuclear, 3 3 3 - 4 0
precipitated b y quaternary a m m o n -
ium, 361
and protein synthesis, 330
synthesis of, b y cell lines, 284
turnover values of, 2 4 1 - 2
Nucleolar organizer, 445
767
Neural crest cells,
chemotaxis and, 186
Neuralization,
of ectoderm, 543, 551
without inducer, 5 4 3 - 4
type of, 544
Neural plate,
cultured with ectoderm, 544
induction of, b y dead tissue, 541
induction of, b y primitive streak, 556
Neural (nervous) tissue,
in aggregates o f ectoderm, 506
critical size for, 473
and determination o f somites, 560
differentiation of, 467, 4 7 1 - 2 , 534
induced in ectoderm, 544, 551
Neural tube (see also Neural tissue, Nervous system, etc.),
closing of, 566
differentiation of, 535
incorporation o f glycine by, 570
iodoacetate and, 571
and phenyl alanine analogues, 572
saline extracts of, and induction, 481
Neuraminic acid,
in bone, 372
and sialic acid, 358
Neuraminidase,
and detachment o f cells, 376
Neurites,
contact guidance of, 187
fasciculation of, 194-5
movement of, 181-2, 185
pinocytosis in, 40
ruffles and filopodia on, 179, 195
Schwann cells and, 195
Neurofibrils,
adrenaline and, 616
Neuroglia cells, 148
differentiation of, 173
as mechanocytes or amoebocytes, 159
Neurons (see also Nerve cells),
adrenaline and, 616
ascorbic acid in, 681
heteropyknosis and, 443
neurofibrils in, 616
nucleolar satellites in, 399
sex chromatin in, 400, 443
Neurula, 534
Neutral red,
and macrophages, 166
and osteoclasts, 647
Nicotinic acid (amide),
for cell lines, 281
and insulin, 600
in synthetic media, 115-16, 280
Nicotinamide-adenine dinucleotides, 263
Nitrites,
and inducing agents, 550
Nitrogen,
balance, 279, 281
protein-, as measure o f tissue, 42
storage o f tissues in liquid, 28
Nondisjunction,
frequency of, 414
in mongolism, 410
and multiple X-chromosomes, 406
Notochord,
differentiation of, 5 3 4 - 6 , 558-60
extracts of, 481
incorporation o f glycine by, 570
induced b y bone marrow, 546
as inducing agent, 481
regions producing, 536, 539, 557, 559
Nuclei,
adrenaline and, 616
b o u n d arginine and, 341
differences between, 173, 512
dry-weight of, 220, 333-41
grafting of, 326
incorporation o f cytidine into, 327
membrane of, 205
morphology of, 440, 4 4 3 - 4
nucleic acid content of, 332-41
of plant cells, 338
rotation of, 40, 205
in vitro and in vivo, 173
volume of, 220
Nucleic acids, 3 1 7 - 4 4
aerobic pathways and synthesis of, 255
from amino acids, 300
A T P and synthesis of, 241
autoradiography and, 398
in e m b r y o extract, 35, 256
glucose and synthesis of, 255, 380
from glutamine, 287
measurements of, in cells, 331-40
nuclear, 3 3 3 - 4 0
precipitated b y quaternary a m m o n -
ium, 361
and protein synthesis, 330
synthesis of, b y cell lines, 284
turnover values of, 2 4 1 - 2
Nucleolar organizer, 445