Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| template specificities of xenopus laevis rna polymerases. selective transcription of ribosomal cistrons by rna polymerase a. | 1974 | 4137235 | |
| the preparation of rna-directed dna polymerase from ovaries of xenopus laevis. | 1974 | 4137289 | |
| structural proteins associated with ribosomal cistrons in xenopus laevis chromosomes. | 1974 | 4138192 | |
| analysis of the c-value paradox by molecular hybridization. | poly(a)-containing rna was isolated from ovaries of xenopus laevis laevis and triturus cristatus carnifex and used as a template for the synthesis of radioactive complementary dna with rna-dependent dna polymerase. when annealed with an excess of homologous dna, the complementary dna is rendered double-stranded with kinetics that suggest that the coding sequences are single-copy in both these organisms. in triturus, these sequences are distinct from the majority of the genome, which consists of ... | 1974 | 4139720 |
| an ultrastructural study of the subcommissural organ cells of the african clawed toad, xenopus laevis. | 1974 | 4140039 | |
| the location of soluble antigen in the spleen of xenopus laevis. | 1974 | 4140102 | |
| the movement of optically detectable organelles in myelinated axons of xenopus laevis. | 1. intra-axonal organelles were detected by darkfield and nomarski microscopy in isolated myelinated nerve fibres from xenopus laevis. nerve fibres from the 8th spinal roots, the sciatic nerve, and identified motor and sensory axons from other hind limb nerves were used. the movement of the organelles was recorded either on motion picture film or by noting the times at which they crossed the lines of an ocular grid.2. three groups of organelles were detected in all fibres. a group of particles w ... | 1974 | 4140230 |
| a morphological study of the epithalamus and the thalamus of xenopus laevis. | 1974 | 4140872 | |
| oogenesis in xenopus laevis (daudin). ii. the induction and subcellular localization of tyrosinase activity in developing oocytes. | 1974 | 4131093 | |
| the retinotectal projection from a double-ventral compound eye in xenopus laevis. | 1974 | 4206638 | |
| immunoglobulin classes in xenopus laevis. | 1974 | 4211233 | |
| [energy production during oocyte maturation in xenopus laevis]. | 1974 | 4211428 | |
| the cortical response in xenopus laevis ova. | 1974 | 4213423 | |
| histochemical characteristics of cement-gland mucin in xenopus laevis. | 1974 | 4275458 | |
| mechanical properties of muscle spindles in xenopus laevis. | 1974 | 4276239 | |
| biochemical changes during progesterone-induced maturation in xenopus laevis oocytes. | 1974 | 4365213 | |
| actions of antifertility chemicals on xenopus laevis spermatozoa in vitro. | 1974 | 4365531 | |
| 28-s rna from xenopus laevis contains a sequence of three adjacent 2'-o-methylations. | 1974 | 4365812 | |
| characteristics of the sensory discharge of the muscle spindle in xenopus laevis. | 1974 | 4366467 | |
| the degradation of ribonucleic acids injected into xenopus laevis oocytes. | 1974 | 4370441 | |
| ultrastructural and cytochemical localization of the storage sites of monoamines in the paraventricular organ of xenopus laevis tadpoles. | 1974 | 4371980 | |
| protein kinase activities during maturation in xenopus laevis oocytes. | 1974 | 4373001 | |
| hormone-induced maturation of xenopus laevis oocytes: effects of different steroids and study of the properties of a progesterone receptor. | 1974 | 4374402 | |
| clustered arrangement of trna genes of xenopus laevis. | 1974 | 4524767 | |
| the structure and evolution of ribosomal and 5s dnas in xenopus laevis and xenopus mulleri. | 1974 | 4524770 | |
| agglutination of jelly coat and cortical granule components and the block to polyspermy in the amphibian xenopus laevis. | a block to polyspermy in amphibians is established at fertilization by the conversion of the vitelline envelope to the fertilization envelope. in xenopus laevis a major ultrastructural change in the envelope at fertilization is the appearance of an electron-dense layer, termed the f layer, between the envelope and the inner-most jelly coat layer, j(1). the f layer is derived, at least in part, from materials released from the cortical granules. further definition of the origin and chemical natur ... | 1974 | 4525317 |
| amplified ribosomal dna from xenopus laevis has heterogeneous spacer lengths. | eco r(1) restriction endonuclease makes two cuts in each repeating unit of amplified ribosomal dna (rdna) from xenopus laevis. the locations of these cuts have been established by comparison of the secondary structure of single-stranded eco r(1) fragments (as visualized in the electron microscope) with that of x. laevis rrnas and of long strands of uncut rdna. of the two classes of fragments generated, the smaller one contains 90% of the 28s rrna gene, has a duplex molecular weight of 3.0 x 10(6 ... | 1974 | 4527647 |
| specification of positional information in retinal ganglion cells of xenopus laevis: intra-ocular control of the time of specification. | programming events in the stage 28-31 clawed frog embryo partly determine the organization of the future retinotectal map by specifying the permanent reference axes for cellular positional information in the retina. thus, when transplanted in 180 degrees -rotated orientation into a stage 27/28 orbit, an unspecified (stage 28 or younger) eye can acquire new axes and develop a normally-oriented retinotectal map, whereas a specified (stage 31 or older) eye retains its original axes and develops an ... | 1974 | 4530323 |
| major dna polymerases common to different xenopus laevis cell types. | dna polymerases from xenopus laevis oocytes, unfertilized eggs, and kidney cells grown in culture have been characterized. the same three major dna polymerase activities are present in all cell types examined. we attempt to relate the characteristics of amphibian enzymes to those of mammalian polymerases. | 1974 | 4530330 |
| specificity in deoxyribonucleic acid uptake by transformable haemophilus influenzae. | cells of haemophilus influenzae strain rd competent for genetic transformation irreversibly bound approximately five molecular fragments of h. influenzae deoxyribonucleic acid (dna) per cell; under identical conditions, dna derived from escherichia coli b was not taken up (<1 molecule per 50 cells). similarly, dna from xenopus laevis was not taken up by competent h. influenzae. of the heterologous dnas tested, only dna from h. parainfluenzae interfered with the uptake of h. influenzae dna, as ju ... | 1974 | 4597440 |
| detection of haemoglobin in red cells of xenopus laevis by immunofluorescent double labelling. | 1974 | 4597872 | |
| replication and transcription of eukaryotic dna in escherichia coli. | fragments of amplified xenopus laevis dna, coding for 18s and 28s ribosomal rna and generated by ecori restriction endonuclease, have been linked in vitro to the bacterial plasmid psc101; and the recombinant molecular species have been introduced into e. coli by transformation. these recombinant plasmids, containing both eukaryotic and prokaryotic dna, replicate stably in e. coli. rna isolated from e. coli minicells harboring the plasmids hybridizes to amplified x. laevis rdna. | 1974 | 4600264 |
| 5'-ends of ribosomal and ribosomal precursor rnas form xenopus laevis. | 1974 | 4600324 | |
| the lampbrush chromosomes of xenopus laevis (daudin). | 1974 | 4609703 | |
| the response of xenopus laevis oocytes to injected somatic nuclei soon after germinal vesicle breakdown induced in vitro. | 1974 | 4609785 | |
| ontogeny and localization of the lens crystallins in xenopus laevis lens regeneration. | 1974 | 4618568 | |
| under-replication of ribosomal cistrons in polytene chromosomes of rhynchosciara. | dna preparations obtained from several tissues of rhynchosciara americana and two related species, r. milleri and r. papaveroi, were hybridized to r. americana rrna. the percentage of hybridization was found to be higher in tissues with low polyteny than in tissues with high polyteny, suggesting a relationship between the amount of rdna and the tissue polyteny. this could be explained by under-replication of ribosomal cistrons in polytene cells, such as those from the salivary gland. only slight ... | 1974 | 4407049 |
| formation and regression of inappropriate nerve sprouts during trochlear nerve regeneration in xenopus laevis. | 1974 | 4418001 | |
| intercellular gap junctions in pigment epithelium cells during retinal specification in xenopus laevis. | 1974 | 4423669 | |
| the decay of xenopus laevis mitochondrial rrna in the presence of ethidium bromide or actinomycin d. | 1974 | 4425966 | |
| observations on early germ cell development and premeiotic ribosomal dna amplification in xenopus laevis. | the origin of premeiotic ribosomal dna (rdna) amplification in germ-line cells of xenopus laevis has been examined using in situ rna-dna hybridization on cytological preparations, tritiated thymidine autoradiography, and isopycnic density gradient centrifugation. primordial germ cells (pgc), from the time they first become localized in the genital ridge at day no. 4 of development, until approximately day no. 22, remain in an extended interphase condition. during this time pgc do not incorporate ... | 1974 | 4426916 |
| ultrastructure of xenopus laevis oocytes after injection of an extract from progesterone-treated oocytes. | 1974 | 4431074 | |
| the effect of hydrocortisone on the sheep red cell response in adult xenopus laevis, the south african clawed toad. | 1974 | 4436631 | |
| an analysis of acidic nuclear proteins during the development of xenopus laevis. | 1974 | 4442125 | |
| hepatic melanosis and ageing in amphibia. a preliminary observation on two species of anura xenopus laevis and rana nigromaculata. | 1974 | 4442478 | |
| metabolism of exogenous 4-14c-progesterone during early development of xenopus laevis. | 1974 | 4442671 | |
| the cyclization of xenopus laevis 5 s dna. | 1974 | 4444032 | |
| secondary structure maps of ribosomal rna and dna. i. processing of xenopus laevis ribosomal rna and structure of single-stranded ribosomal dna. | 1974 | 4444053 | |
| [deranged axial growth of the xenopus laevis larva following elimination of the subcommissural organ]. | 1974 | 4445814 | |
| sequence studies of the 5 s dna of xenopus laevis. | 1974 | 4449128 | |
| an electron microscope heteroduplex study of the ribosomal dnas of xenopus laevis and xenopus mulleri. | 1974 | 4453019 | |
| a study on gonadotropin action in the induction of oocyte maturation in xenopus laevis. | 1974 | 4457129 | |
| regeneration and remyelination of xenopus tadpole optic nerve fibres following transection or crush. | optic nerves of stage 54-56 xenopus laevis tadpoles were either transected or crushed, and subsequent wallerian degeneration, regeneration, and remyelination were examined. after 4 days, normal myelinated fibres were no longer present in the distal stump, and only a few unmyelinated fibres remained. after 10-13 days, the distal nerve consisted mainly of a core of reactive astrocytes with enlarged processes and scattered oligodendrocytes which persisted throughout the degenerative period. regener ... | 1974 | 4461769 |
| the incorporation and fate of [35-s]-sulfate in the jelly coat of xenopus laevis eggs. | 1974 | 4462853 | |
| an ultrastructural study of germ plasm in spermatogenesis of xenopus laevis. | 1974 | 4463219 | |
| synthesis and localization of histone in xenopus laevis gametes. | 1974 | 4464773 | |
| the translation of mammalian globin mrna injected into fertilized eggs of xenopus laevis i. message stability in development. | 1974 | 4471721 | |
| changes in the polysome content of developing xenopus laevis embryos. | 1974 | 4472028 | |
| the cell cycle of xenopus laevis cells in monolayer culture. | 1974 | 4472348 | |
| transcription specificity of xenopus laevis rna polymerase a. | 1974 | 4473382 | |
| arrangement of the 5-8 s rna cistrons in the genome of xenopus laevis. | 1974 | 4473555 | |
| the pattern of concanavalin a-binding sites during the early development of xenopus laevis. | 1974 | 4474060 | |
| protein synthesis directed by the rna from a plant virus in a normal animal cell. | rna from tobacco mosaic virus can be translated inside oocytes of the frog xenopus laevis. the main product is a polypeptide with a molecular weight of 140,000. there is no evidence for coat protein synthesis, and it is unlikely that the polypeptide that is made contains either a whole or a partial coat protein sequence. the picture of translation of tobacco mosaic virus rna obtained using oocytes is very much simpler than that found using cell-free protein-synthesizing systems, in which a great ... | 1974 | 4474972 |
| [dna polymerase of oocytes and ova of xenopus laevis: determination of molecular weights]. | 1974 | 4475595 | |
| effects on protein synthesis of injecting synthetic polyribonucleotides into living cells. | micro-injection into the oocytes and eggs of xenopus laevis was used to ascertain the effects of synthetic polyribonucleotides on protein synthesis in living cells. poly(u) and poly(a) were not translated detectably, nor did they change the rate of endogenous protein synthesis. the same was true of poly(g,u), poly(a,g,u), poly(a,c,g,u), g-u-g-(u)(n), a-(u)(n) and aug. in contrast, a-u-g-(u)(n) was a potent inhibitor of protein synthesis in the cell. this might be because it is initiated normally ... | 1974 | 4477956 |
| studies on fertilization in xenopus laevis. | 1974 | 4477973 | |
| synthesis of rna in oocytes of xenopus laevis during culture in vitro. | 1974 | 4477995 | |
| regeneration electrode units: implants for recording from single peripheral nerve fibers in freely moving animals. | implantable electrode assemblies that become penetrated by regenerating axons were used to record signals from single sensory and motor nerve fibers associated with leg movement in unrestrained amphibians (xenopus laevis). such neuroimplants may provide a means for establishing the roles of various muscle afferents and efferents in posture and locomotion, and have potential clinical applications. | 1974 | 4809567 |
| double sucrose-gap method applied to single muscle fiber of xenopus laevis. | passive electrical properties (internal conductance, membrane conductance, low frequency capacity, and high frequency capacity obtained from the foot of the action potential) of normal and glycerol-treated muscle of xenopus were determined with the intracellular microelectrode technique. the results show that the electrical properties of xenopus muscle are essentially the same as those of frog muscle. characteristics of the action potential of xenopus muscle were also similar to those of frog mu ... | 1974 | 4812637 |
| the effect of catecholamines and background color on the in vitro incorporation of labeled amino acids into the neurointermediate lobe of the pituitary in xenopus laevis. | 1974 | 4815165 | |
| 5-methylcytidylic acid: absence from mitochondrial dna of frogs and hela cells. | the content of 5-methylcytidylic acid in nuclear dna and mito chondrial dna of xenopus laevis and hela cells has been determined. both nuclear dna's contain 5-methylcytidylic acid. the 5-methylcytidylic acid content of x. laevis dna is 1.7 mole percent of total nucleotides, and that of helc cell dna is 0.7 mole percent. in neither mitochondrial dna could any 5-methylcytidylic acid be detected; the limit of sensitivity was judged at below 0.1 mole percent for x. laevis dna and below 0.05 mole per ... | 1974 | 4815287 |
| incorporation of (3h)uridine and (3h)thymidine during the phase of nucleolar mutliplication in xenopus laevis oögenesis: a high-resolution autoradiographic study. | 1974 | 4816642 | |
| formation and structure of the fertilization envelope in xenopus laevis. | 1974 | 4822839 | |
| the cortical granule reaction in living eggs of the toad, xenopus laevis. | 1974 | 4822840 | |
| an ultrastructural analysis of cell and matrix differentiation during early limb development in xenopus laevis. | 1974 | 4823502 | |
| new membrane formation during cytokinesis in normal and cytochalasin b-treated eggs of xenopus laevis. ii. electrophysiological observations. | the electrical membrane potential (e(m)) and electrical membrane resistance (r(m)) were measured continuously during the first cleavage of xenopus eggs, using intracellular microelectrodes. a sharp hyperpolarization of e(m) and decrease in r(m) can be observed from 6 to 8 min after the onset of cleavage. this moment coincides with the onset of the insertion of new membrane (bluemink and de laat, 1973) leading to the formation of the interblastomeric membrane during normal cleavage. removal of th ... | 1974 | 4824285 |
| hatching in the toad xenopus laevis: morphological events and evidence for a hatching enzyme. | 1974 | 4826290 | |
| time of origin of mauthner's neuron in xenopus laevis embryos. | 1974 | 4831106 | |
| gas exchange and its effect on blood gas concentrations in the amphibian, xenopus laevis. | 1974 | 4832998 | |
| an analysis of the degree of homology between 28s rrna from xenopus laevis and xenopus mulleri. | 1974 | 4834689 | |
| polyadenylic acid-containing rna in xenopus laevis oocytes. | 1974 | 4835729 | |
| light microscope autoradiography of ribosomal dna amplification in xenopus laevis. | 1974 | 4852996 | |
| localization of 3h-benzpyrene in the cells of xenopus laevis embryos. | 1974 | 4853030 | |
| nuclear transplantation from specialized and unspecialized gut epithelial cells of adult xenopus laevis. | 1974 | 4853387 | |
| physical properties and protein constituents fo cytoplasmic and mitochondrial ribosomes of xenopus laevis. | 1974 | 4853633 | |
| purification of dna-dependent rna polymerases a and b from ovaries of xenopus laevis. | 1974 | 4853978 | |
| rna metabolism in previtellogenic oocytes of xenopus laevis. | 1974 | 4854181 | |
| the development of the retino-tectal projection in xenopus laevis: an autoradiographic and degeneration study. | 1974 | 4854715 | |
| the effect of nerve growth factor on hindlimb regeneration in xenopus laevis froglets. | 1974 | 4854766 | |
| ultrastructural features of ectodermal--mesenchymal relationships in the developing limb of xenopus laevis. | 1974 | 4855302 | |
| multiple forms of deoxyribonucleic acid-dependent ribonucleic acid polymerase in xenopus laevis. isolation and partial characterization. | 1974 | 4855626 | |
| multiple forms of deoxyribonucleic acid-dependent ribonucleic acid polymerase in xenopus laevis. levels of activity during oocyte and embryonic development. | 1974 | 4855627 | |
| dna-binding proteins of xenopus laevis: synthesis during oogenesis-ovulation and early embryogenesis. | 1974 | 4855878 | |
| a special form of deoxyribonucleic acid dependent ribonucleic acid polymerase from oocytes of xenopus laevis. isolation and characterization. | 1974 | 4856027 | |
| relationship between the amount of the 'germinal plasm' and the number of primordial germ cells in xenopus laevis. | 1974 | 4856488 | |
| on the contents of the cortical granules from xenopus laevis eggs. | 1974 | 4856980 | |
| mitochondrial dna in xenopus laevis oocytes. i. displacement loop occurrence. | 1974 | 4857493 | |
| the translation of mammalian globin mrna injected into fertilized eggs of xenopus laevis. ii. the distribution of globin synthesis in different tissues. | 1974 | 4857973 | |
| resolution of acid-soluble protein component of yolk platelets from xenopus laevis eggs on polyacrylamide gels. | 1974 | 4857974 | |
| ultrastructural changes induced by the fungicide ethylenebis (dithiocarbamic acid)disodium salt (nabm(rabam) in xenopus laevis tissues during development. | 1974 | 4858828 |