Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| incomplete antibodies and immunoglobulin characterization in adult urodeles, pleurodeles waltlii michah. and triturus alpestris laur. | humoral immunoglobulin synthesis has been studied in two adult urodeles, pleurodeles waltlii michah. and triturus alpestris laur. following srbc immunization. the specific antibody response is detected after a long period of immunization and is due exclusively to 'incomplete' antibodies which are unable to induce agglutination. the antibody titre is essentially dependent on the number of stimulations rather than on the dose or nature of the antigen (papainized or normal erythrocytes). antibodies ... | 1975 | 49296 |
| microfilaments in the external surface layer of the early amphibian embryo. | a comparison was made by transmission electron microscopy of the microfilaments in the surface layers of the early embryos of triturus alpestris and xenopus laevis at stages of development up to neurulation. actin-like filaments which bound heavy meromyosin (hmm) were found in cell extracts of all stages, but were comparatively rare in the newly fertilized egg. ten nm microfilaments were present throughout development in xenopus, and from the mid-neurula stage in triturus. both kinds of microfil ... | 1975 | 50397 |
| cell contacts between chorda-mesoderm and the overlaying neuroectoderm (presumptive central nervous system) during the period of primary embryonic induction in amphibians. | using transmission and scanning electron microscopy we were able to show that during primary embryonic induction in amphibians (triturus alpestris) the interspace between the inducing chorda-mesoderm and the reacting ectoderm (presumptive medullary plate) of mid-gastrula stages is traversed by cell projections starting from cells of both tissue layers. in addition intimate membrane contacts between the main bodies of the ectodermal and chorda-mesodermal cells could be observed. it could be ruled ... | 1979 | 478211 |
| changes of nucleosome frequency in nucleolar and non-nucleolar chromatin as a function of transcription: an electron microscopic study. | the morphology of nucleolar and non-nucleolar (lampbrush chromosome loops) chromatin was studied in the electron microscope during states of reduced transcriptional activity in amphibian oocytes (xenopus laevis, triturus alpestris, t. cristatus). reduced transcriptional activity was observed in maturing stages of oocyte development and after treatment with an inhibitor, actinomycin d. strands of nucleolar chromatin appear smooth and thin, and contain only few, if any, nucleosomal particles in th ... | 1978 | 566162 |
| biosynthesis of 11-deoxycorticosteroids and androgens by the ovary of the newt triturus alpestris alpestris laur. | 1977 | 598691 | |
| the ectomesenchymal-endodermal interaction system of triturus alpestris in tissue culture: morphological and histochemical characterization of developing neural derivatives. | in the ectomesenchymal-endodermal interaction system (eeis), a hanging drop culture in which an explant of neural fold from behind the prospective ear region of a triturus alpestris neurula together with a piece of ventrolateral pharynx endoderm is cultivated, the differentiation of a variety of neural crest-derived cells (nerve cells, pigment cells, cartilage cells, perichondrial cells, schwann cells) can be followed. while cartilage cells develop only in contact to pharynx endoderm, the differ ... | 1978 | 700284 |
| a proteoglycan with affinity for the vegetalizing factor: characterization by density gradient centrifugation. | a crude proteoglycan fraction isolated from chicken embryos has an affinity for the vegetalizing factor, which induces mesodermal and endodermal tissues in gastrula ectoderm of triturus alpestris. binding of the factor to the crude proteoglycan results in inactivation of the vegetalizing factor. the crude proteoglycan was centrifuged in cscl and cscl-urea density gradients. most of the inactivating material was recovered from the gradients in the high density proteoglycan fraction. part of the i ... | 1978 | 732367 |
| neural induction, a two-way process. | a quantitative analysis of triturus alpestris recombinates of newly invaginated "caudal" archenteron roof with either competent gastrula ectoderm or non-competent neurula ectoderm has demonstrated that neuralisation evoked by the underlying archenteron roof affects, in its turn, the regional differentiation of the latter. it does so by enhancing its notochordal differentiation; so, neural induction is clearly a two-way process. somite differentiation is not significantly different in the two ser ... | 1978 | 732368 |
| the rejection of intra- and intersexual skin grafts in newts (triturus vulgaris and triturus alpestris). | 1975 | 764953 | |
| [evolution of xenografts of embryonic gonads and juvenile ovaries from ambystoma mexicanum shaw, transplanted into triturus alpestris laur]. | gonad primordium of ambystoma mexicanum when grafted at tail-bud stage on triturus alpestris is indefinately tolerated. testis or ovaries derived from those grafted embryonic gonads follow their differentiaion and reach sexual maturity. axolotl juvenile ovaries transplanted in triturus alpestris are also tolerated; the ovocytes achieve the entire vitellogenesis but are not able to be laid. | 1975 | 809199 |
| incorporation of tritiated cytochalasin b into ectodermal explants of the amphibian gastrula. | ectodermal explants from gastrulae of triturus alpestris were exposed to tritiated cytochalasin b (5 and 10 mug/ml) for 1/2-2 1/2 h. the flat explants failed to heal into compact spheres and the component cells gradually rounded up. radioactivity in the fixed and sectioned material was analysed by light and electron microscopic autoradiography. silver grains were found predominantly over the yolk platelets, but were also scattered over other cellular components. areas containing pigment granules ... | 1976 | 978128 |
| effects of actinomycin d on the association of newly formed ribonucleoproteins with the cistrons of ribosomal rna in triturus oocytes. | the effect of actinomycin d(amd) on the association of the nascent ribonucleo-protein (rnp) fibrils containing the precursors of ribosomal rna (pre-rrna) with their template deoxyribonucleoprotein (rdnp) strands has been studied in lampbrush stage oocytes from triturus alpestris. ovary pieces were incubated in vitro either in media containing radioactive ribonucleosides and then, for various times, in solutions containing 25 mug/ml amd, or were directly exposed to the drug. the ultrastructure of ... | 1975 | 1127008 |
| [activity and isoenzymes of lactate dehydrogenase in tissues of amphibians (xenopus laevis, ambystoma mexicanum, triturus alpestris and vulgaris) and the response in the fat body of xenopus males to gonadotropin injection (author's transl)]. | lactate-dehydrogenase activity was determined by the optical test method using pyruvate as substrate and the isoenzymes were separated by vertical starch gel electrophoresis. species-specific and organ-specific characteristics of the total activity and the isoenzyme patterns of the four amphibian species are compared with those of rat and mouse. application of gonadotropin increases the amount of soluble protein and the lactate-dehydrogenase activity in the fat body of xenopus and the isoenzyme ... | 1975 | 1176091 |
| regulation of transcription of genes of ribosomal rna during amphibian oogenesis. a biochemical and morphological study. | natural changes in the transcription of rrna genes were studied in nucleoli from three oogenic stages of the newt triturus alpestris with electron microscope, auto-radiographic, and biochemical techniques. from determinations of the uridine triphosphate pool sizes and [3h]uridine uptake, phosphorylation, and incorporation into 28s and 18s rrnas in vivo it was estimated that the rate of rrna synthesis was about 0.01% in previtellogenic oocytes and 13% in mature oocytes when compared to midvitello ... | 1976 | 1262400 |
| distribution of catecholaminergic and serotoninergic systems in forebrain and midbrain of the newt, triturus alpestris (urodela). | mapping of monoaminergic systems in the brain of the newt triturus alpestris was achieved with antisera against (1) thyrosine hydroxylase (th), (2) formaldehyde-conjugated dopamine (da), and (3) formaldehyde-conjugated serotonin (5-ht). in the telencephalon, the striatum was densely innervated by a large number of 5-ht-, da- and th-immunoreactive (ir) fibers; ir fibers were more scattered in the amygdala, the medial and lateral forebrain bundles, and the anterior commissure. in the anterior and ... | 1992 | 1352186 |
| effect of vitamin a on wound epidermis during forelimb regeneration in adult newts. | the effects of vitamin a on blastemal epidermis were studied during the early postamputational period of forelimb regeneration in triturus alpestris. vitamin a was administered through oral intubation at a dose of 250 iu per gram of body weight per day. the results were evaluated by morphometry, histology, and autoradiography. after 7, 11 and 14 days of treatment, several alterations were observed in the wound epidermis: a) reversal of keratinization; fewer keratinized cells were counted in sect ... | 1990 | 1705139 |
| topographical relationships between catecholamine- and neuropeptide-containing fibers in the median eminence of the newt, triturus alpestris. an ultrastructural immunocytochemical study. | dopaminergic and peptidergic nerve fibers were simultaneously demonstrated with a double-labeling technique at the ultrastructural level. the first antibody, raised against tyrosine hydroxylase, was applied during the preembedding phase and visualized with the peroxidase method. the second antibody, raised against one of the peptides met-enkephalin, somatostatin or gonadotropin-releasing hormone (gnrh), was applied to the ultrathin sections and visualized with gold-labeled goat anti-rabbit igg. ... | 1990 | 1969331 |
| isolation of a vegetalizing inducing factor after extraction with acid ethanol. concentration-dependent inducing capacity of the factor. | a vegetalizing factor has been isolated from chicken embryos by an improved method. the factor is extracted with acid/ethanol and finally purified by four consecutive steps of reversed phase hplc. the molecular mass is about 25 kda. the factor dissociates after reduction with dithiothreitol into two subunits of about 13 kda. the factor was tested on triturus alpestris by the implantation method, and on isolated ectoderm of xenopus laevis in solution. the factor induces as the crude fractions all ... | 1990 | 2090330 |
| the development of the larval pigment patterns in triturus alpestris and ambystoma mexicanum. | 1. melanophores and xanthophores are pigment cell derivatives of the nc. in amphibian embryos they migrate from their original position on the neural tube dorsally (into the dorsal fin) as well as laterally (between somites and epidermis) and arrange themselves into typical pigment patterns of the skin. we investigated pigment pattern formation in two species of tailed amphibians, triturus alpestris (alpine newt) and ambystoma mexicanum (mexican axolotl). in larvae of t. alpestris alternating lo ... | 1990 | 2368640 |
| telencephalic structures are involved in learning and memory in the newt triturus alpestris. | 1990 | 2377236 | |
| demonstration of sensory-motor innervation of postmetamorphic forelimb regenerates of triturus alpestris (urodela) on cryotome serial sections using horseradish peroxidase. | a method has been developed to obtain horseradish peroxidase-treated serial sections containing spinal cord as well as bilateral ventral and dorsal roots, dorsal root ganglia and spinal nerves. young postmetamorphic newts (triturus alpestris) served as experimental animals. after cryotome cross sectioning the forelimb region of the trunk, slices 80 microns in thickness were mounted serially with up to 15 sections per slide. this facilitated subsequent staining manipulations and made partial loss ... | 1990 | 2378008 |
| embryonic induction and cation concentrations in amphibian embryos. | explanted ectoderm from early gastrulae of triturus alpestris was treated with the na-k ionophore gramicidin (10(-9) to 10(-5) m) and the ca-ionophore a 23187 (10(-7) to 10(-5) m). the ectoderm developed almost exclusively to atypical epidermis as in the control explants. when the ectoderm was treated with ouabain (10(-4) m), intracellular na+ increased about 4.4-fold and k+ was reduced by half. mesenchyme cells in small number differentiated in about 40% of the ouabain-treated explants. the tim ... | 1985 | 2416476 |
| thermal behaviour of a4 lactate dehydrogenase purified from the heterothermic and sympatric vertebrate species brook lamprey (lampetra planeri), tench (tenca tenca), smooth (triturus vulgaris) and alpine newt (triturus alpestris). | 1. the a4 lactate dehydrogenase isozyme was purified to homogeneity from the tissues of brook lamprey (lampetra planeri), tench (tenca tenca), smooth newt (triturus vulgaris) and alpine newt (t. alpestris). 2. these four species share their geographical distribution in the same freshwater habitats, often live together in the same station and two of them are congeneric. steady-state kinetic investigations have shown that: 3. km (apparent) for pyruvate vs. temperature and (apparent) product ki (py ... | 1989 | 2620488 |
| activation of masked neural determinants in amphibian eggs and embryos and their release from the inducing tissue. | the neural-archencephalic (forehead) inducing activity of the microsomes and the high speed supernatant from xenopus laevis ovaries and eggs was tested on gastrula ectoderm of triturus alpestris. both fractions have a very small inducing activity which increases considerably after autolysis or treatment with dissociating agents. a comparison with the inducing activity of the high speed supernatant from gastrulae suggests that neural inducing factors are synthesized in the ovary, stored in a mask ... | 1989 | 2766041 |
| characterization of heterochromatic regions in two triturus alpestris subspecies (urodela: salamandridae). | the fluorescence analysis carried out in triturus alpestris alpestris and triturus alpestris cyreni subspecies has revealed differences related to the content and distribution of at-rich, gc-rich and non-fluorescent heterochromatic bands. these results provide new evidence on the chromosome differentiation undergone in their phylogenetic splitting. | 1989 | 2767986 |
| development of retinofugal neuropil areas in the brain of the alpine newt, triturus alpestris. ii. topographic organization and formation of projections. | the development of retinal projections and the formation of their retinotopic organization were studied by means of anterograde transport of horseradish peroxidase in the newt, triturus alpestris. all tracts found in the adult on the contralateral brain side are established during embryonic stages. at this stage a few uncrossed fibers are also detectable. retinal fibers project first to the contralateral optic tectum. these are followed by contralateral projections to the thalamic recipient area ... | 1988 | 2833132 |
| putative neurotransmitters in the retinae of three urodele species (triturus alpestris, salamandra salamandra, pleurodeles waltli). | the immunocytochemical localization of several substances with putative neurotransmitter or modulator properties was investigated in the retinae of three urodele species. gamma-aminobutyric acid-like immunoreactive labelling appeared in different types of amacrine and horizontal cells. in addition, labelled fibres in the optic nerve were detected. it was not possible to determine whether these fibres were ganglion-cell axons or part of an efferent projection. endogenous serotonin was found in se ... | 1988 | 2898293 |
| two thalamo-telencephalic pathways in a urodele, triturus alpestris. | ascending thalamo-telencephalic projection systems have been investigated in an urodele, triturus alpestris, using the horseradish peroxidase technique. two separate dorsal thalamic projections onto the telencephalon have been identified; one arises from the posterior dorsal thalamus and terminates in the ipsilateral striatum, the other originates from anterior dorsal thalamic cells and reaches the medial pallium and a part of the dorsal pallium bilaterally. both systems, which are spatially wel ... | 1986 | 3014400 |
| identification of pigment cells during early amphibian development (triturus alpestris, ambystoma mexicanum). | the purpose of the present investigation was to provide and apply a methodological manual with which the distribution, patterning and relationship of melanophores and xanthophores can be analyzed during early amphibian development. for demonstration of the methods, which include ultrastructural, histochemical and biochemical approaches, triturus alpestris and ambystoma mexicanum (axolotl) embryos are used. these two species differ conspicuously in their larval pigment patterns, showing alternati ... | 1988 | 3141059 |
| the monoaminergic system in the diencephalon of the newt tadpole, triturus alpestris (mert). a histofluorescence study. | the distribution of monoamines in the brain of triturus alpestris tadpoles was investigated with the falck-hillarp histofluorescence method. this study concerns especially the diencephalon where is observed the major part of the monoaminergic (ma) neurons. ma fiber tracts are found in the striatum, the septal nucleus and the medial and lateral forebrain bundles of the telencephalon. in the anterior diencephalon cerebrospinal fluid (csf)--contacting catecholaminergic cells are localized within th ... | 1988 | 3183361 |
| influence of vitamin a palmitate on the growth of regenerating triturus alpestris forelimbs. | the objective of this investigation was to analyse the effects of vitamin a palmitate orally administered to young postmetamorphic triturus alpestris on the growth of regenerates. vitamin a was administered for 4, 7, 11 and 14 days after amputation at the middle of the right zeugopod. growth of regenerates was evaluated on the basis of external size measurements and blastema cell proliferation. calculation of the percentages of cells in each cell-cycle phase and estimation of mitotic indices dur ... | 1988 | 3196784 |
| topologic and connectional analysis of the dorsal thalamus of triturus alpestris (amphibia, urodela, salamandridae). | a morphological and connectional analysis was performed on the dorsal thalamus of the alpine newt, triturus alpestris. we have used a graphic reconstruction technique for the evaluation of the connectional (hrp) data. on the basis of these reconstructions, we propose a subdivision of the salamandrid dorsal thalamus into subhabenular, anteroventral, and posterodorsal zones. each of these zones is defined by its telencephalic projections ("ascending thalamofugal systems"). the posterodorsal zone p ... | 2012 | 3346376 |
| vitamin a induced bilateral asymmetries in triturus forelimb regenerates. | after amputation of both forelimb of young, postmetamorphic triturus alpestris through the middle of the zeugopod, the left and right regenerates grew asynchronously. as a result of oral administration of vitamin a palmitate (250 iu/gbw/day), from the 4th to the 13th dpa, the growth rate of the right regenerates was relatively higher than that of the left ones. moreover, the percentage of skeletal abnormalities as well as proximodistal duplications (proximalizations), induced by vitamin a, was n ... | 1988 | 3401522 |
| autoradiographic evaluation of vitamin a effects on triturus alpestris blastema cells. | autoradiographic studies on triturus alpestris regenerates treated with vitamin a palmitate for 4, 7, 11 and 14 days after amputation, reveal a considerable diminution in the percentage of cells duplicating dna, as judged by measurements of labelling indices. based on previous observations, that vitamin a promotes dna-synthesis, mitosis and growth of regenerates, we conclude that the lower labelling indices calculated are due to an acceleration of s-phase processes, resulting in a concomitant re ... | 2009 | 3401931 |
| influence of vitamin a on proximal and distal blastemata of triturus alpestris--a morphological and cytophotometrical study. | 1988 | 3412338 | |
| intercalary regeneration in the different hindlimb stages of triturus alpestris larvae. | 1988 | 3412341 | |
| intercalary regeneration in postmetamorphic forelimbs of triturus alpestris. | 1988 | 3412342 | |
| vitamin a promotes dna synthesis and mitosis in blastemas of triturus alpestris. | vitamin a palmitate orally administered to young, post-metamorphic triturus alpestris (amphibia-urodela), for 4 and 7 days after bilateral forelimb amputation at the middle of the zeugopodium, enhanced the mean dna content of the blastema cells. moreover, the number of cells in mitosis was nearly twice as high in vitamin a treated animals than in control ones. | 1987 | 3690680 |
| [synthesis of ribonucleic acids in whole embryos and in the isolated ectoderm of triturus alpestris]. | 1965 | 4160387 | |
| [on the morphogenesis of the opisthonephron in triturus alpestris]. | 1968 | 4174385 | |
| negative staining and adenosine triphosphatase activity of annulate lamellae of newt oocytes. | semi-isolated annulate lamellae were prepared from single newt oocytes (triturus alpestris) by a modified callan-tomlin technique. such preparations were examined with the electron microscope, and the negative staining appearance of the annulate lamellae is described. the annulate lamellae can be detected either adhering to the nuclear envelope or being detached from it. sometimes they are observed to be connected with slender tubular-like structures interpreted as parts of the endoplasmic retic ... | 1969 | 4183078 |
| [histochemistry of the mature oviduct of the mountain triturus alpestris l]. | 1966 | 4228358 | |
| electron spin resonance studies on living cells. 3. development of single individuals in triturus alpestris. | 1972 | 4340784 | |
| the ectomesenchymal-endodermal interaction-system (eeis) of triturus alpestris in tissue culture. i. observations on attachment, migration and differentiation of neural crest cells. | 1974 | 4442672 | |
| [development of lymphoid organs in the urodele amphibian triturus alpestris laur.; skin allograft tolerance after larval thymectomy]. | 1973 | 4577877 | |
| [adrenergic innervation of the hypophysis of triturus alpestris]. | 1972 | 4625351 | |
| [rosette formation in splenic cells of the urodele amphibia triturus alpestris laur. and pleurodeles waltlii michah]. | 1972 | 4631124 | |
| [relationships between structure and chemical composition of spermatozoa in the newt, triturus alpestris laur]. | 1972 | 4672858 | |
| susceptibility of eggs and larvae of triturus alpestris to aflatoxin b1. | 1972 | 4677210 | |
| [spectral sensitivity of triturus alpestris (amphibia, urodela) during aquatric and terrestrial life]. | 1973 | 4737718 | |
| [ultrastructural study of the evolution of interneuronal junctions during the maturation of the central nervous system of triturus alpestris (amphibian, urodele)]. | 1973 | 4785084 | |
| [quantitative histochemistry of glandular secretion of the oviduct in the sexually mature triturus alpestris laur]. | 2016 | 4917893 | |
| [embryonal skin grafts between ambystoma mexicanum shaw, pleurodeles waltlii michah. and triturus alpestris laur.; phenomena of tolerance and rejection]. | 1967 | 4963534 | |
| [relative antigenicity of tegument embryonic heterografts in urodele amphibians: ambystoma mexicanum shaw, triturus helveticus raz., triturus alpestris laur. and pleurodeles waltlii michah]. | 1969 | 4979133 | |
| [electrophoresis study of serum proteins from xenoplastic chimera between urodele amphibia: pleurodeles waltlii michah. and triturus alpestris laur]. | 1969 | 4980276 | |
| [embryonic skin grafts between ambystoma mexicanum shaw, pleurodeles waltlii michah and triturus alpestris laur; phenomena of tolerance and rejection]. | 1967 | 4989164 | |
| [serum proteins and chimerism of the liver of chimeras among the urodelan amphibia: pleurodeles waltlii michah. and triturus alpestris laur]. | 1971 | 4995276 | |
| [action of carcinogenic substances on tail regenerates among triturus alpestris laur. (amphibia, salamandridae)]. | 1971 | 5002515 | |
| intramitochondrial complexes of atypical structures in hepatocytes of triturus alpestris (laurenti). | 1972 | 5036576 | |
| [the ultrastructure of the photoreceptors in the retina of the alpen triton (triturus alpestris)]. | 2008 | 5761614 | |
| [secretory activity of the flexural and subcommissural organs in the early developmental stages of triturus alpestris laur]. | 1965 | 5870925 | |
| tubular elements associated with yolk platelets in triturus alpestris. | 1966 | 5951724 | |
| a reinvestigation of some of the tissue movements involved in the formation of the neural tube and the eye/lens system of triturus alpestris and xenopus laevis. | 1966 | 5962694 | |
| formation of pigment cell patterns in triturus alpestris embryos. | 1982 | 7095277 | |
| the electrical profile of the distal tubule in triturus kidney. | the transepithelial potential difference (vte) and transepithelial resistance (rte) were determined along the length of the distal tubule of the amphibian triturus alpestris. the site of impalements was determined at the end of each experiment by latex injection and microdissection. two segments, differing by their distribution at the surface of the kidney, by their respective diameters and by their electrical properties could be identified: the early distal tubule (edt) and the late distal tubu ... | 1982 | 7177780 |
| sarcomagenesis and myofibril maturation during limb regeneration and development of the newt, triturus alpestris and salamander, salamandra salamandra. | during limb regeneration of the salamander, salamandra salamandra, muscles dedifferentiate and then mesenchymal cells appear, which subsequently, differentiate into muscle. both in regenerates and in developing limbs of newts larvae mesenchymal cells begin to differentiate into myoblasts, which contain both thin (7 nm) and thick (14 nm) filaments, which are often associated with microtubules, developing a cytoskeletal network, which contribute directly to the shape of myoblasts and a linear alig ... | 1980 | 7193943 |
| [histological and histochemical observations on the skin differentiation in metamorphotic and non-metamorphotic triturus alpestris apuanus (bonap) (amphibia urodela)]. | 1981 | 7201300 | |
| projections of color coding retinal neurons in urodele amphibians. | optic fiber projection in the brain of salamandra salamandra was investigated by degeneration techniques. terminal fields are described in the thalamus and in the optic tectum. microelectrode recordings were performed from ganglion cells in the retina and from their terminals in the thalamus and tectum in salamandra and triturus alpestris. 'on' cells showed maximal sensitivity either in the blue or in the yellow spectral region; they project to the thalamus. color coding 'on-off' cells project t ... | 1981 | 7237102 |
| development of retinofugal neuropil areas in the brain of the alpine newt, triturus alpestris. | the development of the retinofugal projection areas of the brain has been studied in larvae of triturus alpestris by means of anterograde transported horseradish peroxidase. the optic tract establishes contacts with the optic tectum prior to the onset of robust terminal formation in the diencephalon. the tectum becomes covered by the retinofugal projection in a rostro-caudal direction. the basal optic neuropil develops synchronously with the oculomotor neurons. their dendrites extend into this n ... | 1981 | 7283179 |
| atypical mitochondria in the lung of newts, triturus alpestris, laur. | 1981 | 7310939 | |
| scanning and transmission electron microscopic study of the lung of the newt, triturus alpestris laur. | the lungs of triturus alpestris laur. were investigated with the scanning and transmission electron microscopes. dimensions of the cell bodies of pneumocytes and ciliated cells, as well as the thickness of the air-blood barrier, were determined. the lungs of the newt form two simple sacs without septa. a ciliated epithelium containing goblet cells lines the pulmonary vein and partially the pulmonary artery. the remainder of the lung surface is covered internally by respiratory epithelium consist ... | 1980 | 7363303 |
| endocrine-like cells in the lungs of the newt, triturus alpestris laur. | endocrine-like cells (elc) scattered in the basal part of the ciliated epithelium were identified in the lungs of the newt, triturus alpestris. these elc have a clear cytoplasm containing large amounts of secretory vesicles (69-180 nm in diameter), especially in their basal parts, but do not display formaldehyde-induced fluorescence. the elc may be associated with nerve fibres. | 1980 | 7407854 |
| a new type of cell in the pulmonary epithelium of the newt triturus alpestris laur. a scanning and transmission electron microscopic study. | single cells of a new type appear scattered among pneumocytes in the pulmonary epithelium. the surfaces of these cells communicate with the air space and display numerous finger-like microvilli. in comparison to pneumocytes, these cells have a more lucid cytoplasm and their apical parts contain large amounts of electron-lucent vesicles and electron-dense granules, which are probably released into the lumen of the lung. these secretory cells exhibit a yellow formaldehyde-induced fluorescence, whi ... | 1980 | 7437126 |
| the role of vertical and planar signals during the early steps of neural induction. | the classical einsteck-test (spemann and mangold, roux arch. dev. biol. 100: 599-638, 1924) and data from total exogastrulae (holtfreter, 1933) suggest that vertical signals are transmitted between the chordamesoderm (organizer) and reacting ectoderm in the early phase of neural induction. in contrast to these results with axoloti (urodeles), several authors observed the expression of neural specific genes in xenopus exogastrulae, isolated dorsal blastopore lip with adjacent ectoderm (open-face ... | 1995 | 7577445 |
| [mirror symmetrical and "left dominant" organization in the gastrula stage molted parabiotic larva of mountain salamander]. | gastrulae of triturus alpestris were laterally fused (body axes in equal directions). the parabiotic larvae mostly showed an undivided body with tail, but exhibited two heads. defects of organogenesis were frequently observed in the gut, and, to some fewer extent, in the heart. the gut mostly develops undivided, the heart in singular or (with transitions) as two organs. the number of organ-inversions and partial inversions was high (table 1). in addition a transindividual organ-symmetry (mirror- ... | 1995 | 7625609 |
| partially purified factor from embryonic chick brain can provoke neuralization of rana temporaria and triturus alpestris but not xenopus laevis early gastrula ectoderm. | a high neuralizing activity has been determined in forebrain of 7.5-day old chick embryos using rana temporaria early gastrula ectoderm as reacting tissue (mikhailov and gorgolyuk, soviet scientific reviews, section of physiology and general biology, vol. 1: 267-306, 1987). the corresponding protease-sensitive agent was extracted, partially purified by chromatography on deae-toyopearl and heparin-ultragel columns, and its neuralizing activity was tested in vitro on ectoderm isolated from early g ... | 1995 | 7669544 |
| [the symmetrical relation of intestines, the habenular nuclei and the intestinal venous system in dorsal-doral and ventral-ventral grown parabiontic larva of mountain salamanders (triturus alpestris)]. | embryos of the newt triturus alpestris were fused in their dorsal regions (dd-parabionts) of their ventral regions (vv-parabionts), while the longitudinal axes were in equal direction. in these parabionts situs and symmetry of the gut, the heart, the habenular nuclei and the vitelline vein were studied. the fusion of the embryos of the dd-parabionts was performed in three developmental stages (after harrison): phase of neurulation (14-18, n-parabionts), late phase of neurulation (19-22, e-parabi ... | 1995 | 7872498 |
| neural crest cell migration and pigment pattern formation in urodele amphibians. | this review deals with research on the development and differentiation of the neural crest (nc) in amphibians carried out during the past twenty years. first, earlier studies on the migration and differentiation of nc cells in vitro are summarized. these studies include the modes of nc cell migration and their differentiation into chondroblasts, perichondral cells, neurons, schwann cells and pigment cells (melanophores and xanthophores). then a summary is given on the development of cranial sens ... | 1996 | 8735933 |
| planar signalling is not sufficient to generate a specific anterior/posterior neural pattern in pseudoexogastrula explants from xenopus and triturus. | early observations on the morphology of total exogastrulae from urodeles (axolotl) had provided evidence for essential vertical signalling mechanisms in the process of neural induction. conversely, more recent studies with anurans (xenopus laevis) making use of molecular markers for neural-specific gene expression appear to support the idea of planar signalling as providing sufficient information for neural differentiation along the anterior-posterior axis. in an attempt to resolve this apparent ... | 2000 | 10585562 |
| paedogenesis in european newts (triturus: salamandridae): cranial morphology during ontogeny. | a cross-sectional analysis using different ontogenetic stages (larvae, juveniles, paedotypic, and metamorphic adults) of the smooth newt, triturus vulgaris, and the alpine newt, t.alpestris, revealed a broad spectrum of perennibranchiation influences on cranial ontogeny in european newts, more pronounced than previously thought. these influences included marked variation in ossification levels, pronounced morphometric variability of many cranial elements, and considerable skull shape changes in ... | 2000 | 10658197 |
| neoteny and progenesis as two heterochronic processes involved in paedomorphosis in triturus alpestris (amphibia: caudata). | current theories on the evolution of paedomorphosis suppose that several ontogenetic pathways have appeared according to different selective pressures. the aim of this study was to find out whether two distinct processes can lead to paedomorphosis in the alpine newt, triturus alpestris. in this respect, we compared age structures of paedomorphic and metamorphic individuals in two newt populations where the two forms lived syntopically. whereas paedomorphosis resulted in a slower rate of somatic ... | 2000 | 10983835 |
| relatedness, body size and paternity in the alpine newt, triturus alpestris. | sexual selection has traditionally been investigated assuming that male quality is as skewed as patterns of male reproductive success can sometimes be. recently, female choice has been investigated under the model of genetic compatibility, which assumes that each individual female has her own 'best' mate and there is no overall optimal choice for all females. we investigated female mate choice in the newt species triturus alpestris, a member of a genus where female choice has been investigated o ... | 2003 | 12769462 |
| [topographical variations in stainability of the cortex of the symmetrized egg of triturus alpestris with nile blue and neutral red]. | 1952 | 13020269 | |
| [results of the change of central and lateral parts of the primary organizer in a young gastrula in triturus alpestris and pleurodeles waltlii]. | 1957 | 13473271 | |
| [additional data on variations in permeability of cortex of triturus alpestris egg to nile blue]. | 1957 | 13500712 | |
| [effect of a thermal gradiant on the embryonic development of triturus alpestris]. | 1958 | 13597429 | |
| [inductive action of the prechordal plate on the ectoblast that was previously influenced by the chorda (triturus alpestris)]. | 1958 | 13605445 | |
| [effects of the return of the ovum of triturus alpestris on the gradient of cortical permeability]. | 1958 | 13609103 | |
| [effects of ultrasounds on the structure and cortical permeability of the egg of triturus alpestris]. | 1960 | 13723559 | |
| [modifications in the structure and the cortical permeability as well as embryonal development after moderate centrifugation of the intact egg of triturus alpestris]. | 1961 | 13723560 | |
| [demonstration of the cortical permeability gradient of the egg of triturus alpestris and its modifications under the influence of certain physical agents (rotation of the egg, centrifugation, ultrasounds)]. | 1959 | 13817327 | |
| [inversion of the sexual phenotype (feminization) of triturus helveticus raz. and triturus alpestris laur, following gynogenous treatment by estradiol benzoate administered during the larval stage]. | 1960 | 13826151 | |
| [demonstration of a biehnial reproductive cycle in the alpine newt]. | 1963 | 13997319 | |
| [research on internal determination of cloacal development in the high alpine newt]. | 1963 | 13997320 | |
| [on neurosecretion in triturus alpestris montenegrinus]. | 2016 | 14051316 | |
| [influence of castration on the rate of regeneration of the extremities in the newt, triturus alpestris laur]. | 1963 | 14081739 | |
| an electron microscope study of the endoplasmic reticulum in newt notochord cells after disturbance with ultrasonic treatment and subsequent regeneration. | ultrasonic treatment of the tails of triturus alpestris tadpoles, at intensities of 8 to 15 watts/cm(2), at 1 megacycle/sec., for 5 minutes, disrupted the epidermis and caused pycnosis in individual cells of the muscle and neural tube, but caused no damage to the notochord that could be detected by light microscopy. electron microscopy showed that this ultrasonic treatment disordered nearly all the endoplasmic reticulum (er) of the notochord cells into irregularly rounded vesicles, but within 3 ... | 1964 | 14105208 |
| [experimental studies on reissner's fiber in triturus alpestris laur]. | 1964 | 14335726 | |
| trophic specialisations in alternative heterochronic morphs. | polymorphisms are suspected of reducing competition among conspecifics in heterogeneous environments by allowing differential resource use. however the adaptive significance of alternative morphs has been poorly documented. the aim of this study is to determine food partitioning of two heterochronic morphs of the alpine newt, triturus alpestris, in mountain lakes. the morphs differ in the functional morphology of their feeding apparatus. only paedomorphs are able to expel water during prey sucti ... | 2004 | 14991145 |
| display lateralisation in the courtship behaviour of the alpine newt (triturus alpestris). | among urodelan amphibians, european newts of the genus triturus have evolved a complex sequence of displays to the effect of stimulating the female to actively pick up the spermatophore deposited by the male. courtship is varied, with plenty of potential for asymmetric uses of tails and of asymmetric turns. the analysis of the temporal structure of the behavioural sequences showed that both males and females significantly utilise the same side during a single courtship sequence. moreover, if an ... | 2002 | 15513203 |