| ontogeny of the immune response in animals having less than one million lymphocytes: the larvae of the toad alytes obstetricans. | | 1970 | 4919032 |
| [the immunity reactions in the tadpole alytes obstetricans. ii. characterization of immunocytes]. | | 1967 | 4234181 |
| configurational prey selection by bufo, alytes, bombina and hyla. | the aim of the present study is to answer the following questions; (1) is the ability of toads to distinguish between different configurational prey stimuli based on learning during ontogeny? (2) is the configurational meaning of a stimulus influenced by its distance from the animal? (3) are there differences in configurational prey selection among different anuran species? (1) experiments with postmetamorphic juveniles of alytes obstetricans indicate that preferences for worm-like objects can b ... | 1979 | 114268 |
| developmental patterns of peroxisomal enzymes in amphibian liver during spontaneous and triiodothyronine-induced metamorphosis. | 1. liver catalase, d-amino acid oxidase, urate oxidase of alytes obstetricans and xenopus laevis (anuran amphibians) and fatty acyl-coa oxidase of alytes were present at all post-embryonic stages. 2. catalase and d-amino acid oxidase activities increased during spontaneous metamorphosis of the two species. 3. during triiodothyronine-induced metamorphosis of alytes larvae, catalase and d-amino acid oxidase activities increased after a latent period. 4. our results suggest that expression of some ... | 1989 | 2776437 |
| hormonal control of the intestinal brush border enzyme activities in developing anuran amphibians. i. effects of hydrocortisone and insulin during and after spontaneous metamorphosis. | the effects of hydrocortisone and insulin on the intestinal brush border membrane enzymatic activities in an anuran amphibian, alytes obstetricans, were investigated at the end of spontaneous metamorphosis and 2 weeks after its completion. at the end of metamorphosis, the brush border is differentiating in the apical region of a developing neoformed epithelium. two weeks after the completion of metamorphosis, this epithelium is entirely formed. the animals received one hormone injection per day ... | 2010 | 2867004 |
| [the tail of the tadpole of alytes obstetricans in organ culture with or without the addition of thyroxine. ultrastructural controls]. | the tail of the alytes obstetricans tadpole, isolated at different stages (end of proclimax and climax), was studied in organ culture. the addition of thyroxine at a concentration of 5.10(-7) induces an involution slower than in vivo. besides, this regression is comparatively slower in similar conditions, than in xenopus laevis. this delay could be explained by the important volume and the very developed musculature of this anuran tail. ultrastructural controls reveal the form of the muscles, th ... | 1976 | 139991 |
| [variation in the specific activity of intestinal dna in alytes obstetricians larvae (amphibia, anura) treated with thyroxine]. | treatment by thyroxine modified the specific activity of intestianl dna in premetamorphic alytes tadpoles. the activity decreased up to the 3rd day, and showed afterwards a peak which culminates on the 9th day. these results have been discussed in comparison with previous radioautographic observations. | 1999 | 96966 |
| potent and rapid bactericidal action of alyteserin-1c and its [e4k] analog against multidrug-resistant strains of acinetobacter baumannii. | the emergence of multidrug-resistant strains of acinetobacter baumannii (mdrab) constitutes a serious threat to public health and necessitates the discovery of new types of antimicrobial agents. alyteserin-1c (glkeifkaglgslvkgiaahvas·nh(2)) is a cationic, α-helical peptide that was first isolated from skin secretions of the midwife toad alytes obstetricans. synthetic alyteserin-1c displayed potent activity against clinical isolates of mdrab (minimum inhibitory concentration, mic=5-10 μm; minimum ... | 2010 | 20603168 |
| ranavirus-associated mass mortality in wild amphibians, the netherlands, 2010: a first report. | in 2010, a mass die-off of over 1000 wild water frogs (pelophylax spp.) and at least 10 common newts (lissotriton vulgaris) occurred in a pond in the netherlands. haemorrhagic disease with hepatomegaly and splenomegaly was evident. microscopically, multiple organs presented cells with multifocal intracytoplasmic inclusion bodies, in which ranavirus-like particles were demonstrated ultrastructurally. all specimens examined tested positive for ranavirus by pcr. the sequence obtained showed a 100% ... | 2011 | 21955440 |
| within- and among-population variation in chytridiomycosis-induced mortality in the toad alytes obstetricans. | chytridiomycosis is a fungal disease linked to local and global extinctions of amphibians. susceptibility to chytridiomycosis varies greatly between amphibian species, but little is known about between- and within-population variability. however, this kind of variability is the basis for the evolution of tolerance and resistance evolution to disease. | 2010 | 20532196 |
| ambient ultraviolet b radiation and prevalence of infection by batrachochytrium dendrobatidis in two amphibian species. | ôçé chytridiomycosis, the emerging disease caused by the chytrid fungus batrachochytrium dendrobatidis (bd) is responsible for declines and extirpations of amphibian populations worldwide. environmental covariates modify the host-bd interaction and thus affect the ongoing spread of the pathogen. one such covariate may be the intensity of ultraviolet b (uv-b) radiation. in a field experiment conducted in laguna grande de pe+¦alara (central spain), a mountainous region where the presence of bd has ... | 2011 | 21676032 |
| pathology, isolation and molecular characterisation of a ranavirus from the common midwife toad alytes obstetricans on the iberian peninsula. | we describe the pathology, isolation and characterisation of a virus responsible for an outbreak of a systemic haemorrhagic disease causing high mortality in tadpoles of the common midwife toad alytes obstetricans in the 'picos de europa' national park in northern spain. the virus, provisionally designated as the common midwife toad virus (cmtv), was isolated from homogenates of visceral tissue from diseased toad tadpoles following inoculation on epithelioma papulosum cyprini (epc) cells. molecu ... | 2009 | 19476279 |
| nonoptimal propagation of advertisement calls of midwife toads in iberian habitats. | this study compares the efficiency of transmission of the advertisement calls of two species of midwife toads, alytes cisternasii and a. obstetricans, in both native and non-native habitats in the iberian peninsula. recorded calls of both species and pure tones were broadcast at ten sites native to either the relatively small a. cisternasii or the larger a. obstetricans. a large variation in the patterns of excess attenuation between localities was observed for calls measured at distances of 0.5 ... | 2006 | 16521783 |
| the alyteserins: two families of antimicrobial peptides from the skin secretions of the midwife toad alytes obstetricans (alytidae). | two families of structurally related c-terminally alpha-amidated antimicrobial peptides have been identified in norepinephrine-stimulated skin secretions of the midwife toad alytes obstetricans (alytidae). the alyteserin-1 peptides (gly-leu-lys-(asp/glu)-ile-phe-lys-ala-gly-leu-gly-ser-leu-val-lys-(gly/asn)-ile-ala-ala-his-val-ala-(asn/ser).nh(2)) show limited structural similarity to the ascaphins from the skins of frogs of the family leiopelmatidae. alyteserin-2a (ile-leu-gly-lys-leu-leu-ser-t ... | 2009 | 19463738 |
| permanent genetic resources added to molecular ecology resources database 1 december 2010-31 january 2011. | this article documents the addition of 238 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: alytes dickhilleni, arapaima gigas, austropotamobius italicus, blumeria graminis f. sp. tritici, cobitis lutheri, dendroctonus ponderosae, glossina morsitans morsitans, haplophilus subterraneus, kirengeshoma palmata, lysimachia japonica, macrolophus pygmaeus, microtus cabrerae, mytilus galloprovincialis, pallisentis (neosentis) celatus, ... | 2011 | 21457476 |
| low gene flow but high genetic diversity in the threatened mallorcan midwife toad alytes muletensis. | we investigated fine-scale genetic structuring in the rare and vulnerable mallorcan midwife toad alytes muletensis using eight polymorphic microsatellite markers. the current range of this amphibian is restricted to some 19 sites of which six are derived from reintroductions, all located in the mountain ranges of mallorca. we sampled tadpoles from 14 pools covering 10 natural sites and two reintroduction sites for microsatellite dna analyses. relatively high levels of genetic variation were foun ... | 2005 | 16156804 |
| batrachochytrium salamandrivorans sp. nov. causes lethal chytridiomycosis in amphibians. | the current biodiversity crisis encompasses a sixth mass extinction event affecting the entire class of amphibians. the infectious disease chytridiomycosis is considered one of the major drivers of global amphibian population decline and extinction and is thought to be caused by a single species of aquatic fungus, batrachochytrium dendrobatidis. however, several amphibian population declines remain unexplained, among them a steep decrease in fire salamander populations (salamandra salamandra) th ... | 2013 | 24003137 |
| the functionality of female reciprocal calls in the iberian midwife toad (alytes cisternasii): female-female acoustic competition? | female midwife toads (genus alytes) emit highly variable reciprocal calls of unclear function prior to and during courtship. in some species, female-female competition, expressed as physical fighting, has been reported. males of majorcan midwife toads (alytes muletensis) show phonotactic response to female calls, and females of iberian midwife toads (alytes cisternasii) respond differently according to the male call characteristics. in this study, i test the hypothesis of female-female acoustic ... | 2002 | 12536281 |
| stage-specific polypeptides and villin expression during the intestinal epithelium substitution of the metamorphosing amphibian. | the amphibian intestinal epithelium provides an excellent aid to study the developmental pattern of protein synthesis during cell life. the metamorphosing tissue demonstrates a kaleidoscope of cell degeneration, proliferation and differentiation. these events occur at specific period in a synchronized cell population. two-dimensional gel electrophoresis, together with histological studies, has been used to examine the changes in the patterns of protein synthesis during intestinal epithelium subs ... | 1987 | 3447919 |
| high levels of population subdivision in a morphologically conserved mediterranean toad (alytes cisternasii) result from recent, multiple refugia: evidence from mtdna, microsatellites and nuclear genealogies. | pleistocene glaciations often resulted in differentiation of taxa in southern european peninsulas, producing the high levels of endemism characteristic of these regions (e.g. the iberian peninsula). despite their small ranges, endemic species often exhibit high levels of intraspecific differentiation as a result of a complex evolutionary history dominated by successive cycles of fragmentation, expansion and subsequent admixture of populations. most evidence so far has come from the study of spec ... | 2009 | 19912538 |
| [changes in the intestines of obstetrical toad (alyte obstetrician) larvae during spontaneous metamorphosis or metamorphosis induced by thyroxine. morphometric study and changes in the protein/dna ratio]. | during spontaneous metamorphosis of alytes obstetricans tadpoles (anuran amphibia), the gut undergoes important modifications. the gut weight/total weight and gut length/body length decrease by stage xviii. they reach maximum reductions of 83 and 90%, respectively, by stage xxiii. tail regression begins only by stage xx. the intestinal protein/dna ratio peaks to a maximum by stage xix, decreases greatly by stage xx then increases slightly by stage xxii. during thyroxine-induced metamorphosis, th ... | 1981 | 6786774 |
| vasoactive intestinal polypeptide (vip)-like immunoreactivity in anuran intestine. | immunocytochemical and radioimmunological techniques with region specific antisera have been used to identify a vasoactive intestinal polypeptide-like material in the anuran intestine. seven species of anura were investigated: bombina bombina, alytes obstetricans, rana temporaria, rana esculenta, hyla arborea, hyla crepitans and bufo bufo. in five of the species (a. obstetricans, r. temporaria, h. arborea, h. crepitans and b. bufo) vasoactive intestinal polypeptide-like immunoreactive mucosal en ... | 1981 | 6784927 |
| outbreak of common midwife toad virus in alpine newts (mesotriton alpestris cyreni) and common midwife toads (alytes obstetricans) in northern spain: a comparative pathological study of an emerging ranavirus. | this report describes the isolation and characterisation of the common midwife toad virus (cmtv) from juvenile alpine newts (mesotriton alpestris cyreni) and common midwife toad (cmt) tadpoles (alytes obstetricans) in the picos de europa national park in northern spain in august 2008. a comparative pathological and immunohistochemical study was carried out using anti-cmtv polyclonal serum. in the kidneys, glomeruli had the most severe histological lesions in cmt tadpoles, while both glomeruli an ... | 2010 | 19703784 |
| occurrence of bombesin and alytesin in extracts of the skin of three european discoglossid frogs and pharmacological actions of bombesin on extravascular smooth muscle. | 1. methanol extracts of the skin of bombina bombina and bombina variegata variegata, two european discoglossid frogs, contain an active tetradecapeptide, bombesin. alytesin, a tetradecapeptide strictly related to bombesin is present in extracts of the skin of alytes obstetricans, another european discoglossid frog. the american frog rana pipiens, contains in its skin ranatensin, an endecapeptide related to bombesin and alytesin.2. passage of crude skin extracts of bombina through a column of alu ... | 1972 | 5048651 |
| interacting symbionts and immunity in the amphibian skin mucosome predict disease risk and probiotic effectiveness. | pathogenesis is strongly dependent on microbial context, but development of probiotic therapies has neglected the impact of ecological interactions. dynamics among microbial communities, host immune responses, and environmental conditions may alter the effect of probiotics in human and veterinary medicine, agriculture and aquaculture, and the proposed treatment of emerging wildlife and zoonotic diseases such as those occurring on amphibians or vectored by mosquitoes. here we use a holistic measu ... | 2014 | 24789229 |
| environmental determinants of recent endemism of batrachochytrium dendrobatidis infections in amphibian assemblages in the absence of disease outbreaks. | the inconsistent distribution of large-scale infection mediated die-offs and the subsequent population declines of several animal species, urges us to understand how, when, and why species are affected by disease. it is often unclear when or under what conditions a pathogen constitutes a threat to a host. often, variation of environmental conditions plays a role. globally batrachochytrium dendrobatidis (bd) causes amphibian declines; however, host responses are inconsistent and this fungus appea ... | 2014 | 24641583 |
| batrachochytrium dendrobatidis in germany: distribution, prevalences, and prediction of high risk areas. | in germany, the pathogenic fungus batrachochytrium dendrobatidis (bd) was detected in 11 indigenous frog species, 4 newt species, and 1 salamander species in 64 out of the 181 locations (35%) investigated. among the 3450 samples collected between 2003 and 2011, 284 (8.2%) were positive for bd infections. the highest prevalences were observed in alytes obstetricans (17.8% of individuals, 20% of populations), followed by ichthyosaura alpestris (14.7%, 22.2%), bombina variegata (13.9%, 38.5%), and ... | 2013 | 24270023 |
| context-dependent amphibian host population response to an invading pathogen. | amphibian chytridiomycosis, caused by the chytrid fungus batrachochytrium dendrobatidis (bd), is an emerging infectious disease that widely threatens amphibian biodiversity. however, population-level outcomes following the introduction of the pathogen are highly context dependent and are mediated by a broad suite of biotic and abiotic variables. here, we examine the effect of the introduction of bd on native island populations of the iucn red-listed amphibian species alytes muletensis, the mallo ... | 2013 | 24015523 |
| laboratory tests of antifungal agents to treat tadpoles against the pathogen batrachochytrium dendrobatidis . | the fungus batrachochytrium dendrobatidis (bd), which is the etiological agent of the disease chytridiomycosis, is threatening both wild and captive amphibians. while there are some methods of treating amphibians in captivity, no method has yet been shown to be a promising treatment for amphibian populations in natural habitats. here we present the results of a laboratory experiment in which we tested 2 antifungal agents that might be used to treat amphibians in the field. as a first step toward ... | 2013 | 23574705 |
| evidence for the introduction of lethal chytridiomycosis affecting wild betic midwife toads (alytes dickhilleni). | batrachochytrium dendrobatidis is an unpredictable pathogen for european amphibian species, and existing field surveillance studies likely underestimate the scope of its distribution and effects. mass mortality episodes recorded in europe indicate that investigations of unstudied species should focus on members of the frog family alytidae. here, we report the combined results of a field survey and laboratory observations of field collected alytes dickhilleni. our data support the hypothesis that ... | 2013 | 23494771 |
| a non-invasive stress assay shows that tadpole populations infected with batrachochytrium dendrobatidis have elevated corticosterone levels. | batrachochytrium dendrobatidis (bd) is a fungus that causes the disease chytridiomycosis and is associated with widespread amphibian declines. populations vary in their susceptibility to bd infections, and the virulence of the infecting lineage can also vary. both of these factors may manifest as a differential physiological stress response. in addition, variation in disease susceptibility across amphibian populations may be influenced by immunosuppression caused by chronic stress imposed by env ... | 2013 | 23418508 |
| concurrent ranavirus and batrachochytrium dendrobatidis infection in captive frogs (phyllobates and dendrobates species), the netherlands, 2012: a first report. | a ranavirus infection with concurrent batrachochytrium dendrobatidis infection and mortality in captive phyllobates and dendrobates species is reported. greyish skin with hepato- and reno-megaly were evident. microscopically, batrachochytrium dendrobatidis was present in the stratum corneum of the hyperkeratotic skin. intracytoplasmic inclusion bodies were present in erythrocytes and multiple organs. all samples examined tested positive using pcr for the major capsid protein (mcp) gene of ranavi ... | 2012 | 23102620 |
| elevated corticosterone levels and changes in amphibian behavior are associated with batrachochytrium dendrobatidis (bd) infection and bd lineage. | few studies have examined the role hormones play in mediating clinical changes associated with infection by the parasite batrachochytrium dendrobatidis (bd). glucocorticoid (gc) hormones such as corticosteroids (cort) regulate homeostasis and likely play a key role in response to infection in amphibians. we explore the relationship between cort release rates and bd infection in tadpoles of the common midwife toad, alytes obstetricians, using a non-invasive water-borne hormone collection method a ... | 2015 | 25893675 |
| short term minimum water temperatures determine levels of infection by the amphibian chytrid fungus in alytes obstetricans tadpoles. | amphibians are one of the groups of wildlife most seriously threatened by emerging infectious disease. in particular, chytridiomycosis, caused by the aquatic fungus batrachochytrium dendrobatidis, is responsible for amphibian species declines on a worldwide scale. population-level outcomes following the introduction of the pathogen are context dependent and mediated by a large suite of abiotic and biotic variables. in particular, studies have shown that temperature has a key role in determining ... | 2015 | 25793985 |
| [a test with the administration of a gonadotropic hormone fsh sensitive up to 1/1000 mouse units on alytes obstetricans]. | | 1961 | 13885259 |
| treatment of amphibians infected with chytrid fungus: learning from failed trials with itraconazole, antimicrobial peptides, bacteria, and heat therapy. | amphibian conservation goals depend on effective disease-treatment protocols. desirable protocols are species, life stage, and context specific, but currently few treatment options exist for amphibians infected with the chytrid fungus batrachochytrium dendrobatidis (bd). treatment options, at present, include antifungal drugs and heat therapy, but risks of toxicity and side-effects make these options untenable in some cases. here, we report on the comparison of several novel treatments with a mo ... | 2012 | 22422126 |
| impact of asynchronous emergence of two lethal pathogens on amphibian assemblages. | emerging diseases have been increasingly associated with population declines, with co-infections exhibiting many types of interactions. the chytrid fungus (batrachochytrium dendrobatidis) and ranaviruses have extraordinarily broad host ranges, however co-infection dynamics have been largely overlooked. we investigated the pattern of co-occurrence of these two pathogens in an amphibian assemblage in serra da estrela (portugal). the detection of chytridiomycosis in portugal was linked to populatio ... | 2017 | 28240267 |
| populations of a susceptible amphibian species can grow despite the presence of a pathogenic chytrid fungus. | disease can be an important driver of host population dynamics and epizootics can cause severe host population declines. batrachochytrium dendrobatidis (bd), the pathogen causing amphibian chytridiomycosis, may occur epizootically or enzootically and can harm amphibian populations in many ways. while effects of bd epizootics are well documented, the effects of enzootic bd have rarely been described. we used a state-space model that accounts for observation error to test whether population trends ... | 2012 | 22496836 |
| infection and transmission heterogeneity of a multi-host pathogen (batrachochytrium dendrobatidis) within an amphibian community. | the majority of parasites infect multiple hosts. as the outcome of the infection is different in each of them, most studies of wildlife disease focus on the few species that suffer the most severe consequences. however, the role that each host plays in the persistence and transmission of infection can be crucial to understanding the spread of a parasite and the risk it poses to the community. current theory predicts that certain host species can modulate the infection in other species by amplify ... | 2016 | 26865231 |
| climate forcing of an emerging pathogenic fungus across a montane multi-host community. | changes in the timings of seasonality as a result of anthropogenic climate change are predicted to occur over the coming decades. while this is expected to have widespread impacts on the dynamics of infectious disease through environmental forcing, empirical data are lacking. here, we investigated whether seasonality, specifically the timing of spring ice-thaw, affected susceptibility to infection by the emerging pathogenic fungus batrachochytrium dendrobatidis (bd) across a montane community of ... | 2016 | 28080980 |
| assessing the ability of swab data to determine the true burden of infection for the amphibian pathogen batrachochytrium dendrobatidis. | batrachochytrium dendrobatidis (bd) is a pathogenic fungus which causes the disease chytridiomycosis in amphibians by infecting the animals' epidermis. the most commonly applied method for the detection of bd is the use of a sterile swab, rubbed over the keratinized areas of an amphibian and then processed to yield dna for detection by qpcr. this method has been used to infer a threshold of lethal infection in some species; however, how reliable and reproducible the swabbing method is at detecti ... | 2016 | 27060065 |
| selected emerging diseases of amphibia. | this review summarizes the most recent updates on emerging infectious diseases of amphibia. a brief summary of batrachochytrium dendrobatidis history, epidemiology, pathogenesis, life cycle, diagnosis, treatment, and biosecurity is provided. ambystoma tigrinum virus, common midwife toad virus, frog virus 3, rana grylio virus, rana catesbeiana ranavirus, mahaffey road virus, rana esculenta virus, bohle iridovirus, and tiger frog virus ranaviruses are extensively reviewed. emerging bacterial patho ... | 2013 | 23642863 |
| analogues of the frog skin peptide alyteserin-2a with enhanced antimicrobial activities against gram-negative bacteria. | the emergence of strains of multidrug-resistant gram-negative bacteria mandates a search for new types of antimicrobial agents. alyteserin-2a (ilgkllstaagllsnl.nh₂) is a cationic, α-helical peptide, first isolated from skin secretions of the midwife toad, alytes obstetricans, which displays relatively weak antimicrobial and haemolytic activities. increasing the cationicity of alyteserin-2a while maintaining amphipathicity by the substitution gly¹¹ → lys enhanced the potency against both gram-neg ... | 2012 | 22392897 |
| [testicular protein secretions of alytes obstetricans after a gonadotrope hormone injection (author's transl)]. | | 1974 | 4464807 |
| [identification by immunofluorescence of hypophyseal corticotropic and melanotropic cells in alytes obstetricans (laur) larvae]. | | 1974 | 4377542 |
| [role of epithelial cells adjacent to dental columns in the dynamics of horny tooth cells in tadpoles of alytes obstetricans laurenti]. | | 1974 | 4283093 |
| [variation in the histone contents of the tadpole alytes obstetricans laur. in the course of metamorphosis]. | | 2016 | 4794823 |
| [crowd effect in the tadpoles of alytes obstetricans laur. variations in weight and structure of the liver (author's transl)]. | | 1973 | 4748696 |
| [somatotropin and prolactin cells in the hypophysis of the tadpole of alytes obstetricans laur. identification by immunofluorescence]. | | 1973 | 4609571 |
| [infrastructure of the eclosion glands in midwife toads (alytes obstetricans)]. | | 1972 | 4347186 |
| [study with polyacrylamide gel electrophoresis and the immunoelectrophoresis, of the proteins of the anterior lobe of the hypophysis of alytes obstetricans laur. tadpoles]. | | 1972 | 4625348 |
| [intra-and interspecific crowding-effects in tadpoles ofbufo calamila laur.] | tadpoles ofbufo calamita, a species that spawns in little temporary pools, were tested on intra- and interspecific crowding-effects. water was conditioned by tadpoles of the following species:bufo calamita (tadpoles of different age),alytes obstetricans, bombina variegata, bufo bufo, hyla arborea, rana lessonae, r. ridibunda andr. temporaria. tadpoles ofbufo calamita are most sensitive to water conditioned by older tadpoles of the own species during the first 2-3 weeks of development. they are a ... | 1972 | 28307074 |
| [synapses of the frontal organ of alytes obstetricans laur: presence of bands of a synaptic type at the level of the junction between sensory cells of photoreceptor type and nerve endings]. | | 1971 | 5002449 |
| ranavirus causes mass die-offs of alpine amphibians in the southwestern alps, france. | pathogenic fungi and viruses cause mortality outbreaks in wild amphibians worldwide. in the summer of 2012, dead tadpoles and adults of the european common frog rana temporaria were reported in alpine lakes in the southwestern alps (mercantour national park, france). a preliminary investigation using molecular diagnostic techniques identified a ranavirus as the potential pathogenic agent. three mortality events were recorded in the park, and samples were collected. the amphibian chytrid fungus b ... | 2016 | 26967128 |
| [influence of grouping on the growth and metamorphosis of the obstetrician toad: alytes obstetricans laur. demonstration of a group effect]. | | 1970 | 4995210 |
| [preliminary observations on structure and ultrastructure of the frontal organ of alytes obstetricians laur. at the beginning of metamorphosis]. | | 1970 | 4992922 |
| [new observations on the test of determination of gonadotropic hormones using the tadpole alytes obstetricans. trials performed with lh and fsh (n.i.h.) purified substances]. | | 2016 | 5455241 |
| [histones, thyroid gland and metamorphosis in alytes obstetricans and rana temporaria]. | | 2016 | 5455240 |
| [thyroid activity of tadpoles of alytes obstetricans laur, deprived of diencephalon]. | | 2016 | 5455239 |
| | tadpoles of rana temporaria which have been raised in an artificial pond prey in the experimental situation shown in fig. 1 upon the spawn of the following sympatric european anura species: rana temporaria (cannibalism), rana esculenta, rana ridibunda, bufo bufo, bufo calamita, bombina variegata and hyla arborea (predation). - rana temporaria is an early breeder. thus selection pressure acts in the following ways: rana temporaria establishes for itself an explosive breeding pattern. species whic ... | 1970 | 28309036 |
| [cytological study of the distal lobe of the pituitary gland of alytes obstetricans laur tadpole, during larval development]. | | 2016 | 4194791 |
| [experimental metamorphosis, in the tadpole alytes obstetricans laur., of the skin of the tail, normally destined to degenerate]. | | 1969 | 4895035 |
| [ultrastructure of intestinal epithelium of larva in an amphibian anoura, alytes obstetricans laur]. | | 1969 | 5809190 |
| [ultrastructural modifications in the epithelium of the tadpole of alytes obstetricans laur. ii. histogenetic phenomena]. | | 1969 | 5371902 |
| [ultrastructural modifications in the epithelium of the tadpole of alytes obstetricans laur. i. histolytic phenomena]. | | 1969 | 5371901 |
| [the hatching gland of the obstetrical toad (alytes obstetricans (laurenti)) and of other anurans]. | | 1969 | 4900402 |
| [effects of 3 antibiotics (actinomycin, chloramphenicol and puromycin) on the alkaline phosphatase activity of the exocrine pancreas in the tadpole (alytes obstetricans laurenti)]. | | 2013 | 5714676 |
| [thyroid metabolism of hypophysectomized tadpoles of alytes obstetricians]. | | 1967 | 5615523 |
| [the comparative karyology of alytes obstetricans (laurenti) and of the european discoglossidae]. | | 2015 | 5959299 |
| complete genome sequence of a common midwife toad virus-like ranavirus associated with mass mortalities in wild amphibians in the netherlands. | a ranavirus associated with mass mortalities in wild water frogs (pelophylax spp.) and other amphibians in the netherlands since 2010 was isolated, and its complete genome sequence was determined. the virus has a genome of 107,772 bp and shows 96.5% sequence identity with the common midwife toad virus from spain. | 2014 | 25540340 |
| [ultrastructure of the larval pancreas of an anuran amphibian, alytes obstetricans l, in organ culture]. | different techniques have been used to realise organ culture of larval pancreas of alytes obstetricans laur. some methods allow to get satisfaction results. the general aspect of the explant is described, as also the ultrastructure of the different parts of the pancreas. the results allow to consider the experimental study of the in vitro metamorphosis under the influence of thyroxine. | 1975 | 129251 |
| investigation of amphibian mortality events in wildlife reveals an on-going ranavirus epidemic in the north of the netherlands. | in the four years following the first detection of ranavirus (genus ranavirus, family iridoviridae) infection in dutch wildlife in 2010, amphibian mortality events were investigated nationwide to detect, characterize and map ranaviruses in amphibians over time, and to establish the affected host species and the clinico-pathological presentation of the disease in these hosts. the ultimate goal was to obtain more insight into ranavirus disease emergence and ecological risk. in total 155 dead amphi ... | 2016 | 27315226 |
| ontogenetic aspects on visual "size-constancy" phenomena in the midwife toad alytes obstetricans (laur.). | about 2 weeks after metamorphosis, midwife toads alytes obstetricans judge the size of a prey object mainly in scales of visual angle. for distant objects they show a tendency to respond to absolute object size. about 6 months later the juvenile animals are able to judge absolute prey size in relation to the stimulus distance ("size constancy" phenomenon). this ability is not necessarily based on learning or previous experience. | 1979 | 435971 |
| immunofluorescence of somatostatin-producing sites in the hypothalamus of the tadpole, alytes obstetricans laur. | three sites of somatostatin-synthesizing perikarya, or a related antigen, were determined by immunofluorescence in the hypothalamus of the tadpole, alytes obstetricans (amphibia, anura). two sites of neurosecretory perikarya were localized in the preoptic nuclei of the anterior hypothalamus; the axons extended either to the anterior diencephalon or to the median eminence and the pituitary. the third site was found in the posterior hypothalamus. these neurosecretory cells showed a strong immunofl ... | 1978 | 343920 |
| [effects of ablation of the pituitary complex in the tadpole of the obstetrical toad alytes obstetricans (laur.)]. | | 1964 | 14143637 |
| [electrophoretic blood examinations in 2 species of anura tadpoles: discoglossus pictus (otth.) and alytes obstetricans (laur.). comparisons between controls and animals which received cutaneous heterografts]. | | 1964 | 14262530 |
| [quantitative study of the pancreas of alytes obstetricans laur. during larval life and metamorphosis]. | | 1964 | 14145462 |
| [use of the tadpole of alytes obstetricans for determination of a gonadotropic hormone in the urine of women]. | | 1963 | 14109077 |
| a new species of nurse-frog (aromobatidae, allobates) from the madeira river basin with a small geographic range. | i describe the seventh species of nurse-frog (allobates) from the madeira river basin in brazilian amazonia. the new species is distinguished from similar congeneric species by its small body size (snout-to-vent length ranging between 14.0-14.7 mm in adult males and between 14.7-14.9 mm in adult females), by the absence of dark brown regular shapes (e.g. hourglass, "x" or polygon-like marks) on the dorsum, by the absence of transverse dark bars on the dorsal surface of the thigh, and by the ligh ... | 2016 | 27394243 |
| evaluation of mpeg-7-based audio descriptors for animal voice recognition over wireless acoustic sensor networks. | environmental audio monitoring is a huge area of interest for biologists all over the world. this is why some audio monitoring system have been proposed in the literature, which can be classified into two different approaches: acquirement and compression of all audio patterns in order to send them as raw data to a main server; or specific recognition systems based on audio patterns. the first approach presents the drawback of a high amount of information to be stored in a main server. moreover, ... | 2016 | 27213375 |
| [ablation of the diencephalon prevents metamorphosis in the tadpole of the obstetrical toad, alytes obstetricans (laur)]. | | 1962 | 14491429 |
| [arrest of the metamorphosis of the alytes obstetricans tadpole by cold and darkness for a 2-year period. normal resumption of its development after this prolonged artificial diapause]. | | 1962 | 13885260 |
| [histogenesis of the cutaneous glands of alytes obstetricans laur]. | | 2006 | 13705398 |
| [on the regeneration of the extremities in an anurous batrachnoid alytes obstetricans]. | | 1960 | 14415056 |
| [experimental research on the mechanism of hatching in the obstetrical toad (alytes obstetricans laur.)]. | | 1960 | 13767414 |
| [on the action of the gonadotropic hormone fsh on the testicle of the tadpole of alytes obstetricans laur. duration of experimental spermatogenesis]. | | 1960 | 13721700 |
| [keratization of the teeth and of the larval beak in alytes obstetricans laurent]. | | 2007 | 13797972 |
| [keratinization of the teeth and the mouth of larvae of alytes obstetricans laurenti]. | | 2007 | 13797971 |
| [the action of the gonadotropic hormone on the gonads of very young tadpoles of alytes obstetricans laur]. | | 1959 | 13815755 |
| [a unique case of regeneration in an anuran batrachian, alytes obstetricans]. | | 1958 | 13537378 |
| [vitamin e stimulates larval growth and hastens metamorphosis in the toad, alytes obstetricans laur]. | | 1958 | 13639470 |
| [electron microscopy of the synapses of the visual cells in the tadpole of alytes obstetricans]. | | 1957 | 13461383 |
| [chemical method of restoration of power of regeneration in an anurous batrachian alytes obstetricans]. | | 1956 | 13383864 |
| [a method of activation of the power of regeneration in an anuran batrachian, alytes obstetricans]. | | 1955 | 14364886 |
| [effect of 1-methyl-2-mercapto imidazol on natural and experimental metamorphosis of larvae of alytes obstetricans laurenti]. | | 1954 | 13229018 |
| [regeneration and metamorphosis in a tailless batrachian alytes obstetricans]. | | 1952 | 13033299 |
| [effect of p-hydroxypropiophenone on natural and experimental metamorphosis in alytes obstetricans laur. larvae]. | | 1952 | 13031198 |
| multilocus phylogeography of the common midwife toad, alytes obstetricans (anura, alytidae): contrasting patterns of lineage diversification and genetic structure in the iberian refugium. | recent investigations on the evolutionary history of the common midwife toad (alytes obstetricans) revealed high levels of geographically structured genetic diversity but also a situation where delineation of major historical lineages and resolution of their relationships are much more complex than previously thought. we studied sequence variation in one mitochondrial and four nuclear genes throughout the entire distribution range of all recognized a. obstetricans subspecies to infer the evoluti ... | 2015 | 26282950 |
| a new species of allobates (anura: aromobatidae) from parque nacional da amazônia, pará state, brazil. | we describe the fourth species of nurse-frog genus allobates occurring in the southeastern brazilian amazonia. the new species is sympatric with allobates femoralis, allobates masniger and allobates magnussoni, and inhabits the margins of streams in forested areas within parque nacional da amazônia, on the western bank of the tapajós river. snout-to-vent length ranges between 14.9-16.1 mm among males and 15.6-16.5 mm among females. the species is distinguished by the light brown background color ... | 2015 | 26249969 |
| genetic attributes of midwife toad (alytes obstetricans) populations do not correlate with degree of species decline. | genetic diversity is crucial for long-term population persistence. population loss and subsequent reduction in migration rate among the most important processes that are expected to lead to a reduction in genetic diversity and an increase in genetic differentiation. while the theory behind this is well-developed, empirical evidence from wild populations is inconsistent. using microsatellite markers, we compared the genetic structure of populations of an amphibian species, the midwife toad (alyte ... | 2013 | 24101974 |