| the effect of ribosomal protein exchange on the activity of xenopus laevis ribosomes. | | 1972 | 5077849 |
| correlation between ultrastructural aspect of nucleoli and inhibition of ribosomal rna synthesis in xenopus laevis oocytes. | | 1972 | 5080792 |
| [ultrastructure and iodine uptake of the thyroid gland in larvae of xenopus laevis daud]. | | 1972 | 5081865 |
| the distribution and development of gonadotropic activity in the pituitary of xenopus laevis. | | 1971 | 5087966 |
| the role of the lateral-line efferent system in xenopus laevis. | | 1971 | 5090097 |
| changes in the rate of incorporation of (h3)leucine in the pars intermedia of xenopus laevis at early times after change of background colour. | | 1971 | 5090917 |
| effects of change of background colour on the ultrastructure of the 'msh cells' of the pars intermedia of xenopus laevis. | | 1971 | 5090918 |
| 3,5,3'-triiodo-l-thyronine uptake and development of metamorphic competence by xenopus laevis embryonic tissues. | | 1971 | 5094238 |
| denaturation map of the ribosomal dna of xenopus laevis. | | 1971 | 5099292 |
| cytochalasin b ii: selective inhibition of cytokinesis in xenopus laevis eggs. | | 1971 | 5102939 |
| ultrastructure of diploid and haploid cells of xenopus laevis larvae. | | 1971 | 5105720 |
| a molecular approach to fertilization. i. disulfide bonds in xenopus laevis jelly coat and a molecular hypothesis for fertilization. | | 1971 | 5105911 |
| progesterone-induced maturational events in oocytes of xenopus laevis. i. continuous necessity for diffusible calcium and magnesium. | | 1971 | 5113962 |
| progesterone-induced maturational events in oocytes of xenopus laevis. ii. change in intracellular calcium and magnesium distribution at germinal vesicle breakdown. | | 1971 | 5113963 |
| the structure and function of the lateral line system in larval xenopus laevis. | | 1971 | 5114041 |
| a method for the production of pigmentless eggs in xenopus laevis. | | 1971 | 5114712 |
| expression of the paternal genes for glutamate-oxaloacetate transaminase (got) during embryogenesis in xenopus laevis. | | 1971 | 5114713 |
| lipofuscin-carrying macrophages in the brain of xenopus laevis. | | 1971 | 5118760 |
| rates of incorporation of ( 3 h)leucine into protein of the pars intermedia of the pituitary in the amphibian xenopus laevis after change of background colour. | | 1971 | 5122831 |
| chemical composition of an oestrogen-induced calcium-binding glycolipophosphoprotein in xenopus laevis. | 1. oestrogen treatment has previously been shown to induce the formation of large amounts of a serum protein, vitellogenin (xenoprotein), in xenopus laevis. vitellogenin was purified from serum by dimethylformamide precipitation and was shown to be homogeneous by a variety of electrophoretic techniques. 2. the molecular weight of vitellogenin was estimated by gel filtration to be about 6x10(5). the chemical constituents of vitellogenin were determined and lead to the characterization of this pro ... | 1971 | 5124778 |
| the effect of change of background color on the melanocyte-stimulating hormone content of the pituitary of xenopus laevis. | | 1971 | 5128302 |
| studies on the induction and biosynthesis of vitellogenin, an oestrogen-induced glycolipophosphoprotein. | 1. oestrogen treatment induces the formation of a ca(2+)-binding glycolipophosphoprotein, vitellogenin, in xenopus laevis. 2. the incorporation of l-[4,5-(3)h]-leucine into vitellogenin in vivo and in vitro was observed 12-24h after hormone treatment and increased progressively up to 21 days after treatment. 3. vitellogenin is shown to be the major protein component biosynthesized and released into the incubation medium in vitro by livers from oestrogen-treated animals. 4. the biosynthesis in vi ... | 1971 | 5131730 |
| the crystalline yolk-platelet proteins and their soluble plasma precursor in an amphibian, xenopus laevis. | a single lipophosphoprotein complex, vitellogenin, was isolated and purified from the plasma of oestrogen-stimulated female toads by preparative ultracentrifugation and chromatography on teae-cellulose (triethylaminoethylcellulose). the protein contains 12% lipid, 1.5% phosphorus, 1.6% calcium and smaller amounts of carbohydrates and biliverdin. in amino acid composition it is identical with total yolk-platelet protein. the platelet protein, however, is fractionated on teae-cellulose into two co ... | 1971 | 5131731 |
| lsd: its effect upon 5-hydroxytryptamine in embryonic development of xenopus laevis. | | 1971 | 5132588 |
| a timing study of dna amplification in xenopus laevis oocytes. | | 1971 | 5133545 |
| neurosecretion in thyroidless xenopus laevis larvae. | | 1971 | 5139515 |
| histological features of neural induction in xenopus laevis. | | 1971 | 5146319 |
| the behaviour of the egg pigment in wild-type and "rusty" tadpoles of xenopus laevis. | | 1971 | 5146320 |
| tadpole behaviour: aggregation in larval xenopus laevis. | | 1971 | 5150482 |
| a study of the regeneration of the cerebellum of xenopus laevis (daudin) in the larval stages and after metamorphosis. | | 1971 | 5151353 |
| differences in the fine structure and chemical constitution of nucleolar bodies and the true nucleolus in xenopus laevis embryos. | | 1971 | 5152589 |
| early limb development of xenopus laevis. | | 1971 | 5157347 |
| the effect of early thymectomy on histogenesis of the lymphoid organs in xenopus laevis. | | 1971 | 5157348 |
| [recessive semi-lethal tr (turner) mutation in xenopus laevis]. | | 1971 | 5157429 |
| delayed innervation of the optic tectum during development in xenopus laevis. | | 1971 | 5157533 |
| the fine structure of the cutaneous poison glands in xenopus laevis. | | 1971 | 5158410 |
| the relationship between protein synthesis and ribosomal dna amplification in xenopus laevis. | | 1971 | 5160752 |
| the preoptico-neurohypophysial neurosecretory system in thyroidless xenopus laevis larvae. | | 1971 | 5165634 |
| lactate dehydrogenase isozymes of xenopus laevis: factors affecting their appearance during early development. | | 1971 | 5165791 |
| the fine structure of intercellular junctions in the developing retina of xenopus laevis. | | 1971 | 5167116 |
| 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 |
| potassium inactivation in single myelinated nerve fibres of xenopus laevis. | | 1971 | 5167747 |
| an ultrastructural study of primordial germ cells, oogonia and early oocytes in xenopus laevis. | | 1971 | 5168216 |
| optic nerve fibre counts and retinal ganglion cell counts during development of xenopus laevis (daudin). | | 1971 | 5206673 |
| ornithine-urea cycle activity in xenopus laevis: adaptation in saline. | the concentration of urea in the blood and the rate of urea excretion were markedly elevated in xenopus maintained in hypertonic saline for 2 to 3 weeks. these changes were accompanied by a twofold increase in the activity of the ornithine-urea cycle as measured in liver slices. the activity of carbamoyl phosphate synthetase rose threefold in frogs adapted to saline. these results suggest that changes in activities of urea cycle enzymes may be important in the adaptation of aquatic organisms to ... | 1967 | 5212401 |
| lymphosarcoma in the south african clawed toad, xenopus laevis: a virus tumor. | | 1965 | 5220162 |
| experiments on the pattern of the blood vessels in the central nervous system of xenopus laevis. | | 1966 | 5222650 |
| isolation of deoxyribonucleic acid from the yolk platelets of xenopus laevis oöcyte. | | 1968 | 5245981 |
| disinhibition processes in the cord of the spinal frog (xenopus laevis). | | 1968 | 5247148 |
| the mitochondrial ribosome of xenopus laevis. | a mitochondrial ribosome with an approximate sedimentation coefficient of 60 s has been isolated from the ovary of the south african clawed toad, xenopus laevis. this ribosome is active in a submitochondrial protein-synthesizing system. it contains two species of rna, designated as "21s" and 13s rna, which have sequences complementary to mitochondrial dna and share no detectable sequence homology with cytoplasmic ribosomal rna. | 1970 | 5273890 |
| putrescine and spermidine biosynthesis in the development of normal and anucleolate mutants of xenopus laevis. | ornithine decarboxylase (ec 4.1.1.17), the enzyme that catalyzes the synthesis of putrescine from ornithine, increases dramatically in developing xenopus embryos. between the 2-cell stage and early blastula stage, activity increases 10-fold, and in swimming tadpoles, the enzyme activity is 100-fold higher than that present in either unfertilized eggs or 2-cell embryos. s-adenosyl-l-methionine decarboxylase, an enzyme that catalyzes spermidine synthesis from putrescine and s-adenosyl-l-methionine ... | 1971 | 5276754 |
| rna-dependent dna polymerase: possible role in the amplification of ribosomal dna in xenopus oocytes. | 2',5' - dimethyl - n(4')benzyl - n(4') - [desmethyl]rifampicin, a derivative of rifampicin, is used to acquire autoradiographic evidence that rna-dependent dna synthesis is involved in gene amplification during the early oogenesis of xenopus laevis. | 1971 | 5288255 |
| the cortex of xenopus laevis embryos: regional differences in composition and biological activity. | the cortex of fertilized xenopus laevis eggs undergoes regional changes in its composition and morphogenetic activity during the first three divisions. gray crescent and animal pole cortex of stage 1 (1-cell) and stage 4 (8-cell) embryos each contain a characteristic array of proteins. implantation of pieces of cortex into the blastocoel of midblastula embryos was used to assay their inductive capacity. the gray crescent cortex was shown to be the only region that had significant axis-inducing a ... | 1971 | 5289235 |
| purification and some characteristics of 5s dna from xenopus laevis. | dna containing the multiple genes for 5s rna has been isolated from the genome of xenopus laevis. whereas 5s rna is about 57% g + c, the 5s dna has a base composition of about 33-35% gc and consists of two alternating regions that differ in base composition by at least 20% gc. a denaturation map of 5s dna analyzed by electron microscopy demonstrates that the repeating pattern is regular and each repeating unit has a mass of about 500,000 daltons. if one gene for 5s rna (84,000 daltons native) we ... | 1971 | 5289255 |
| [effect of a major trauma and subsequent regeneration on the rate of metamorphosis in xenopus laevis daudin tadpoles]. | | 1965 | 5294468 |
| [sensitivity to tritox-30 (ddt, gamma-hch, dmdt) of tadpoles of xenopus laevis daudin and rana temporaria l]. | | 1971 | 5316473 |
| the effects of light and dark backgrounds upon indoleamine enzymes in developing xenopus laevis. | | 1971 | 5317388 |
| the prolongation of homograft survival time in the platanna, xenopus laevis laevis (daudin), by exposure to low environmental temperature. | | 1965 | 5319902 |
| the induction of lymphosarcoma in xenopus laevis by cancerous and normal tissues of rana pipiens. | | 1965 | 5327927 |
| factors influencing the differentiation of amphibian embryos implanted into homologous immunologically competent hosts (xenopus laevis). | | 1966 | 5332238 |
| fine structure of rna codewords recognized by bacterial, amphibian, and mammalian transfer rna. | nucleotide sequences of 50 rna codons recognized by amphibian and mammalian liver transfer rna preparations were determined and compared with those recognized by escherichia coli transfer rna. almost identical translations were obtained with transfer rna from guinea pig liver, xenopus laevis liver (south african clawed toad), and e. coli. however, guinea pig and xenopus transfer rna differ markedly from e. coli transfer rna in relative response to certain trinucleotides. transfer rna from mammal ... | 1967 | 5335001 |
| haemoglobin synthesis in vitro by erythrocytes from xenopus laevis. | | 1969 | 5347601 |
| dna content of mauthner cell nuclei in xenopus laevis: a spectrophotometric study. | | 1969 | 5347928 |
| the role of thyroxine in the formation of gland rudiments in the skin of xenopus laevis. | | 1969 | 5353579 |
| [on the morphogenesis of the regenerating mesencephalon in larvae of xenopus laevis]. | | 1969 | 5357414 |
| ultrastructural observations on the parathyroid glands of xenopus laevis daudin. | | 1969 | 5358092 |
| the effect of ddd on single ranvier nodes of xenopus laevis. | | 1969 | 5361454 |
| histogenesis of lymphoid organs in larvae of the south african clawed toad, xenopus laevis (daudin). | | 1969 | 5361557 |
| the length of secondary chromosomal constrictions in normal individuals and in a nucleolar mutant of xenopus laevis. | | 1969 | 5365248 |
| co-ordinated synthesis of some ribosomal proteins and ribosomal rna in embryos of xenopus laevis. | | 1969 | 5365957 |
| properties of the ribosomal rna precursor in xenopus laevis; comparison to the precursor in mammals and in plants. | | 1969 | 5367033 |
| an electron microscopic study of chordamesoderm-neurectoderm association in gastrulae of a toad, xenopus laevis. | | 1969 | 5372005 |
| changes in the excretion of terminal products of nitrogen metabolism in xenopus laevis (daudin) as a result of adaptation to the environment. | | 1969 | 5373833 |
| [electron microscopic findings on the chorda dorsalis of the tadpole tail in rana temporaria and xenopus laevis]. | | 1969 | 5378583 |
| [electron microscopic findings on the tail muscle fibers from tadpoles of rana temporalis and xenopus laevis]. | | 1969 | 5378584 |
| effects of rotating neural tissue and underlying mesoderm in xenopus laevis embryos. | | 1969 | 5379986 |
| [blood group substances in toads and frogs. i. serological analysis of the red cells and gastric mucosa of xenopus laevis and rana catesbiana]. | | 1969 | 5389820 |
| observations on the origin of the 'germinal cytoplasm' in xenopus laevis. | | 1969 | 5391303 |
| [blood group substances in toads and frogs. 2. component sugars of water-soluble substances from xenopus laevis and rana catesbiana]. | | 1969 | 5392999 |
| hanging drop culture of xenopus laevis neural crest. | | 1969 | 5393214 |
| staging of pigment cells in cultures of xenopus laevis neural crest. | | 1969 | 5393215 |
| a study of the regenerative capacity of the central nervous system of anuran amphibia in relation to their stage of development. i. observations on the regeneration of the optic lobe of xenopus laevis (daudin) in the larval stages. | | 1969 | 5401735 |
| [origin and heredity of the mutation "rusty" (ry) of the batrachian anuran xenopus laevis (daudin)]. | | 1969 | 5409253 |
| presence of caerulein in extracts of the skin of leptodactylus pentadactylus labyrinthicus and of xenopus laevis. | 1. the south american amphibian leptodactylus pentadactylus labyrinthicus and the south african amphibian xenopus laevis contain in their skin a polypeptide indistinguishable from caerulein prepared from the australian amphibian hyla caerulea.2. the caerulein content of different batches of leptodactylus pentadactylus labyrinthicus skins varies from 10 to 500-600 mug/g tissue. drying of the skin causes either a moderate decrease or a slight increase in the caerulein content. methanol extraction ... | 1970 | 5413288 |
| the effect of actinomycin d on nucleolar formationin early xenopus laevis gastrulae. | | 1970 | 5437461 |
| acid phosphatase in the tail of xenopus laevis during development and metamorphosis. | | 1970 | 5437469 |
| [sonar spectrography study of sound emission in the clawed toad, xenopus laevis]. | | 1970 | 5439629 |
| polyacrylamide gel electrophoresis of nucleic acids synthesised during the early development of xenopus laevis daudin. | | 1970 | 5441188 |
| [histoautoradiographic studies on dna synthesis in embryos of xenopus laevis; influence of 5-fluorouracil]. | | 1970 | 5442893 |
| the effect of lung ventilation on blood flow to the lungs and body of the amphibian, xenopus laevis. | | 1970 | 5445182 |
| [enrichment of the vegetalizing induction factor from the clawed toad (xenopus laevis) gastrula and determination of the molecular weight range by gradient centrifugation]. | | 1970 | 5446639 |
| neurulation in xenopus laevis. an analysis and model based upon light and electron microscopy. | | 1970 | 5449482 |
| mutations affecting the size of the nucleolus in xenopus laevis. | | 1970 | 5451103 |
| accelerated synthesis of urea in xenopus laevis during osmotic stress. | | 1970 | 5459477 |
| inhibitory effects of colchicine on ciliogenesis in ectoderm of xenopus laevis. | | 1970 | 5461419 |
| a spontaneous anaplastic intestinal metastasising carcinoma in a south african clawed toad (xenopus laevis daudin). | | 1970 | 5464115 |
| renal function during osmotic stress in the aquatic toad xenopus laevis. | | 1970 | 5466608 |
| transmission of the "lymphoid tumour" of xenopus laevis by injection of cell-free extracts. | | 1970 | 5468598 |
| the influence of colloidal carbon on hemagglutinin production in the toad, xenopus laevis. | | 1970 | 5471975 |
| the effects of change of background colour on the rate of [3h]leucine incorporation and total melanocyte-stimulating hormone content of the pars intermedia of xenopus laevis. | | 1970 | 5472415 |