Publications
Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
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dissociation of ribosomes from oocytes of xenopus laevis into active subparticles. | ribosomes from oocytes of xenopus laevis possess low endogenous activity in vivo and in vitro, yet are readily stimulated by poly(u). the ease with which these ribosomes dissociate into active subparticles under conditions where polyribosomes and active monoribosomes are stable supports the view that the majority are unprogrammed. | 1971 | 5167141 |
early limb development of xenopus laevis. | 1971 | 5157347 | |
the effect of early thymectomy on histogenesis of the lymphoid organs in xenopus laevis. | 1971 | 5157348 | |
potassium inactivation in single myelinated nerve fibres of xenopus laevis. | 1971 | 5167747 | |
oestrogen biosynthesis by ovarian tissue of the south african clawed toad, xenopus laevis daudin. | 1971 | 5542999 | |
a molecular approach to fertilization. ii. viability and artificial fertilization of xenopus laevis gemetes. | 1971 | 5567826 | |
the distribution of melanosomes in larvae reared from normal and from pigmentless eggs of xenopus laevis. | 1971 | 5569240 | |
the effects of iproniazid upon brain size and larval behavior of developing xenopus laevis. | 1971 | 5571386 | |
differential growth of the neural retina in xenopus laevis larvae. | 1971 | 5553368 | |
the growth of the retina in xenopus laevis: an autoradiographic study. | 1971 | 5565078 | |
changes in the melanophorotropic function of the pituitary gland accompanying blindness in xenopus laevis daudin. | 1971 | 5554638 | |
yolk-platelet formation in oocytes of xenopus laevis (daudin). | 1971 | 5565402 | |
melanophore-stimulating hormone-melatonin antagonism in relation to colour change in xenopus laevis. | 1971 | 5559851 | |
the relationship between cleavage and blastocoel formation in xenopus laevis. i. light microscopic observations. | 1971 | 5565077 | |
[ultrastructure of the spinal liquor contacting neurons in the clawed toad (xenopus laevis)]. | 1971 | 5545441 | |
the effect of intertectal neuronal connexions of rearing xenopus laevis in total darkness. | 1971 | 5548020 | |
[biochemical studies on oogenesis. i. rna synthesis and accumulation during oogenesis of the south african toad xenopus laevis]. | 1971 | 5553364 | |
the preoptico-neurohypophysial neurosecretory system in thyroidless xenopus laevis larvae. | 1971 | 5165634 | |
an histochemical investigation of acid phosphatase activity in the pronephros of the developing xenopus laevis tadpole. | 1971 | 5571385 | |
the post-metamorphic innervation by optic fibres of a virgin tectum in xenopus laevis. | 1971 | 5574836 | |
fine structural changes in the differentiating epidermis of xenopus laevis embryos. | 1971 | 5575314 | |
the nucleotide sequence of somatic 5 s rna from xenopus laevis. | 1972 | 11946709 | |
sequence heterogeneity of 5 s rna in xenopus laevis. | 1972 | 11946710 | |
the appearance, during development, of responses in the optic tectum following visual stimulation of the ipsilateral eye in xenopus laevis. | 1972 | 5021907 | |
the effect of actinomycin d on developing pigment cells of xenopus laevis. | 1972 | 5075789 | |
the effect of ribosomal protein exchange on the activity of xenopus laevis ribosomes. | 1972 | 5077849 | |
properties of the primary organization field in the embryo of xenopus laevis. i. autonomy of cell behaviour at the site of initial organizer formation. | 1972 | 5074314 | |
correlation between ultrastructural aspect of nucleoli and inhibition of ribosomal rna synthesis in xenopus laevis oocytes. | 1972 | 5080792 | |
the development of the tectum in xenopus laevis: an autoradiographic study. | 1972 | 5074324 | |
[changes of electrolyte content in amphibian tissues during larval development, metamorphosis and regeneration (xenopus laevis daudin and triturus cristatus carnifex)]. | 1972 | 5074322 | |
properties of the primary organization field in the embryo of xenopus laevis. ii. positional information for axial organization in embryos with two head organizers. | 1972 | 5074320 | |
properties of the primary organization field in the embryo of xenopus laevis. 3. retention of polarity in cell groups excised from the region of the early organizer. | 1972 | 5074321 | |
[biochemical studies on oogenesis. 1. intracellular rna distribution in small oocytes of xenopus laevis]. | 1972 | 5043320 | |
[biochemical studies on oogenesis. 2. ribosome assembly during the development of oocytes in xenopus laevis]. | 1972 | 5043321 | |
[ultrastructure and iodine uptake of the thyroid gland in larvae of xenopus laevis daud]. | 1972 | 5081865 | |
[effects of hypophysectomy and thyroidectomy of larva of xenopus laevis d. on the development of intestinal epithelium]. | 1972 | 5026888 | |
binocular interaction in the development of optokinetic reflexes in tadpoles of xenopus laevis. | 1972 | 5028235 | |
dna polymerase activity during maturation in xenopus laevis oocytes. | 1972 | 5043183 | |
[differentiation of tsh-cells in xenopus laevis under normal conditions and after thiouracil-treatment]. | 1972 | 5011146 | |
intracellular calcium and cell cleavage in early embryos of xenopus laevis. | 1972 | 5063471 | |
unusual yolk platelets in embryos of xenopus laevis (amphibia). | 1972 | 5042773 | |
thin layer isoelectric focusing of the soluble lens extracts from larval stages and adult xenopus laevis. | 1972 | 5030595 | |
[evidence of deuterencephalic-spinocaudal induction activity in gastrula extracts of xenopus laevis after hydroxyapatite chromatography or electrofocusing]. | 1972 | 5040082 | |
the effect of calcium on the potassium permeability in the myelinated nerve fibre of xenopus laevis. | 1972 | 5049418 | |
quantification of ultrastructural changes in the 'melanocyte-stimulating hormone cell' of the pars intermedia of the pituitary of xenopus laevis, produced by change of background colour. | 1972 | 5024057 | |
specific cell sap requirement for peptide chain initiation in a cell-free system prepared from xenopus laevis liver. | 1972 | 5026317 | |
the biosynthesis, intracellular transport, and packaging of melanocyte-stimulating peptides in the amphibian pars intermedia. | experiments in which glycine-(3)h has been introduced into excised neurointermediate lobes of xenopus laevis incubated in a modified krebs-ringer bicarbonate medium have shown that approximately 50% of the incorporated radioactivity is present in small peptides which have an electrophoretic mobility characteristic of the melanocyte-stimulating (msh) peptides shown to be elaborated within the tissue. based on these results and the demonstration that a discrete approximately 7 min pulse of the lab ... | 1972 | 5028257 |
ultrastructural features of neural induction in xenopus laevis. | 1972 | 5016948 | |
a comparison of the ribosomal dna's of xenopus laevis and xenopus mulleri: the evolution of tandem genes. | 1972 | 5016971 | |
fine structural features of hind limb development in xenopus laevis. | 1972 | 5070820 | |
karyotype analysis of xenopus muelleri (peters) and xenopus laevis (daudin), pipidae. | 1972 | 5072789 | |
[influence of the optic nerve on the regeneration of the mesecephalon of xenopus laevis (daudin)]. | 1972 | 5073712 | |
the timing of meiosis and dna synthesis during early oogenesis in the toad, xenopus laevis. | recently metamorphosed female xenopus laevis toads were injected with tritiated thymidine. animals were kept at 20 degrees c and were sacrificed 1-23 days after isotope injection. radio-autographs of squash preparations of the ovaries were made. the progress of labeled germ cell nuclei was followed to obtain information on the time course of early meiosis and extra-chromosomal dna synthesis. premeiotic s was estimated to take not more than 7 days. leptotene takes 4 days, zygotene takes 5 days, a ... | 1972 | 5009519 |
the stabilizing action of prolactin on the lysosomes in tails from xenopus laevis daudin tadpoles. | 1972 | 5016216 | |
an analysis of ribosomal protein during the development of xenopus laevis. | 1972 | 5033050 | |
the growth of the retina in xenopus laevis: an autoradiographic study. ii. retinal growth in compound eyes. | 1972 | 5039211 | |
oestrogen-stimulated lipid biosynthesis in xenopus laevis. | 1972 | 5039238 | |
fine structure of spermatogenesis in the south african clawed toad xenopus laevis daudin. | 1972 | 4636020 | |
amino acid uptake by xenopus laevis embryos: effect of triiodo-l-thyronine. | 1972 | 4642918 | |
the number and activity of ribosomal rna genes in xenopus laevis embryos carrying partial deletions in both nucleolar organizers. | 1972 | 4666750 | |
duration of karyomitosis and cell division in cleavage divisions ii-iv in the clawed frog, xenopus laevis. | 1972 | 4677475 | |
the reaction of the preoptic nucleus of xenopus laevis tadpoles to osmotic stimulation. a fluorescence microscopical investigation. | 1972 | 4638294 | |
determination of the nucleoside triphosphate contents of eggs and oocytes of xenopus laevis. | the ribonucleotide and deoxyribonucleotide contents of eggs and oocytes of xenopus laevis were measured. eggs contained most deoxyribonucleotide in the form of triphosphates. dctp, dttp, datp and dgtp were present in similar amounts. the egg contained sufficient deoxynucleotide triphosphate to make approximately 2500 nuclei. oocytes contained less pyrimidine deoxyribonucleoside triphosphates than did eggs, and purine deoxyribonucleoside triphosphates were not detected. these differences may be c ... | 1972 | 4672799 |
[determinism of polarity in xenopus laevis oocytes: a study with scanning and transmission electron microscopes]. | 1972 | 4674597 | |
[biochemical research on oogenesis. v. comparison between somatic 5 s rna and oocyte 5 s rna in xenopus laevis]. | 1972 | 4676241 | |
changes in the pigment pattern of eggs of xenopus laevis following fertilization. | 1972 | 4676895 | |
aspects of the ultrastructure of the alimentary canal and respiratory ducts in xenopus laevis larvae. | 1972 | 4638092 | |
a chemical and pharmacological study on the role of catecholamines in the dispersion reaction of xenopus laevis. | 1972 | 4401401 | |
comparative study of the development of myosin specificity in two amphibian species (immunofluorescence-rana temporaria-xenopus laevis). | 1972 | 4552920 | |
purification and properties of mitochondrial deoxyribonucleic acid dependent ribonucleic acid polymerase from ovaries of xenopus laevis. | 1972 | 4559794 | |
electron microscopic study on the xanthophore differentiation in xenopus laevis, with special reference to their pterinosomes. | 1972 | 4335114 | |
cytochemical localization of tyrosinase activity in pigmented epithelial cells of rana pipiens and xenopus laevis larvae. | 1972 | 4623762 | |
[identification by immunofluorescence of thyrotropic and gonadotropic cells of the hypophysis of an anourous amphibian: xenopus laevis]. | 1972 | 4630082 | |
specification of positional information in retinal ganglion cells of xenopus: stability of the specified state. | in the normal development of retinotectal connections, the site in the tectum at which an optic fiber synapses is related to the position of its ganglion-cell body in the retina. how and when the ganglion cells acquire information about their positions is unknown, but the positional information that each ganglion cell will ultimately act upon is determined or specified at embryonic stages 28-32 in the clawed frog, xenopus laevis. here we report that once positional information has been so specif ... | 1972 | 4507610 |
action of progesterone and related steroids on oocyte maturation in xenopus laevis. an in vitro study. | 1972 | 4670882 | |
ribosomal rna synthesis in pre- and postgastrula embryos of xenopus laevis. | 1972 | 4670883 | |
calf crystallin synthesis in frog cells: the translation of lens-cell 14s rna in oocytes. | 14s rna isolated from calf-lens polyribosomes was injected into oocytes of the frog xenopus laevis. oocytes injected with 14s rna and buffer contained a protein resembling the a2 chain of calf alpha-crystallin; oocytes injected with buffer alone contained no crystallin-like material. alphaa2 crystallin polypeptides were identified by various criteria: urea-gel electrophoresis under acidic and basic conditions, gel electrophoresis in sodium dodecyl sulfate, n-terminal analysis, and paper chromato ... | 1972 | 4504377 |
[on the role of rna in gene amplification]. | a complex of ribosomal dna with rna has been isolated from ovaries of metamorphosing tadpoles of xenopus laevis. the complex is disrupted by treatments that destroy hydrogen bonds, and the sedimentation of the dna within the complex is sensitive to rnase. we suggest that the rna-ribosomal dna complex is an intermediate in the synthesis of amplified ribosomal dna and that the rna is a template. in addition, in a preliminary attempt to mimic the amplification process in vitro, we have demonstrated ... | 1972 | 4505650 |
an rna-dna complex intermediate in ribosomal gene amplification. | an rna-ribosomal dna complex can be isolated from ovaries of xenopus laevis incubated in vitro during the amplification stage. a part of the rna present in the complex is resistent to rnase but becomes completely sensitive after heat denaturation, a treatment that also allows the separation of the rna from the dna. the size of the rna-ribosomal dna complex is strongly reduced after treatment with rnase. a small fraction of the rna present in the complex is complementary to the spacer region of t ... | 1972 | 4505651 |
immunological activity of transplanted spleens in xenopus laevis. | 1972 | 4561795 | |
mitochondrial rna in xenopus laevis. i. the expression of the mitochondrial genome. | 1972 | 4564177 | |
mitochondrial rna in xenopus laevis. ii. molecular weights and other physical properties of mitochondrial ribosomal and 4 s rna. | 1972 | 4564178 | |
suppression of the allograft response by implants of mature lymphoid tissues in larval xenopus laevis. | 1972 | 4564971 | |
the role of water-regulating mechanisms in the development of the haploid syndrome in xenopus laevis. | 1972 | 4642996 | |
[studies on the metabolism of steroid hormones in vertebrates. ix. the metabolism of (4- 14 c)testosterone in the liver of the african water frog (xenopus laevis)]. | 1972 | 4650172 | |
[studies on metabolism of steroid hormones in vertebrates. x. metabolism of (4- 14c)estrone in liver slices of normal and of sex-converted african water frogs (xenopus laevis)]. | 1972 | 4650173 | |
the effect of thyroxine and hypertonic environment on the enzymes of the urea cycle in xenopus laevis. | 1972 | 4653167 | |
[biochemical research on oogenesis. 4. absence of amplification of 5 s rna and trna organizer genes in early xenopus laevis oocytes]. | 1972 | 4654399 | |
the fine structure of the developing retina in xenopus laevis. | 1972 | 4655323 | |
collagen synthesis in xenopus oocytes after injection of nuclear rna of frog embryos. | a messenger rna fraction from polysomes of frog larvae or rna preparations from isolated nuclei of developing frog embryos were injected into growing xenopus laevis oocytes that were incubated with labeled proline. column chromatography of protein hydrolyzates revealed labeled hydroxyproline after injection of the messenger rna fraction and neurula nuclear rna, indicating that the injected material had promoted collagen synthesis. | 1972 | 4539141 |
long term retention of colloidal thorium dioxide in the liver and spleen of xenopus laevis daudin. | 1972 | 4638907 | |
analysis of histones from different tissues and embryos of xenopus laevis (daudin). i. technical problems in the purification of undegraded native total histone preparations. | 1972 | 4642119 | |
response to skin allografts in xenopus laevis following thymectomy at early stages of lymphoid organ maturation. | 1972 | 4114967 | |
characterization of yolk dna from xenopus laevis oocytes ovulated in vitro. | high molecular weight dna was isolated from the yolk platelets of xenopus laevis oocytes ovulated in vitro. yolk dna has the same buoyant density in cscl gradients as mitochondrial and nuclear dnas, and, like them, it is double-stranded. yolk dna behaves like nuclear dna, and not like mitochondrial dna, upon renaturation after denaturation. the molecules are always linear. cytochemical and biochemical controls preclude the possibility that the yolk dna might be contaminated by nuclear or mitocho ... | 1972 | 4113867 |
some responses of the clawed toad, xenopus laevis, to soluble antigens administered in adjuvant. | 1972 | 4117179 | |
hormonal regulation of the skin diffusional permeability to water during development and metamorphosis of xenopus laevis daudin. | 1972 | 4335780 | |
long-term cell culture of two differentiated cell types from the liver of larval and adult xenopus laevis. | 1972 | 4336791 | |
some pathological aspects of the spontaneous lymphoid tumour in xenopus laevis. | 1972 | 4337642 | |
substrate-dependent beta-hydroxy steroid dehydrogenase activity in the gonads of the clawed toad (xenopus laevis daud.). | 1972 | 4260704 | |
amino acid pools in developing oocytes of xenopus laevis. | 1972 | 4339521 |