• A total of 366 amphibian species have been recorded in Mexico, 3 of which are extinct. (wikipedia.org)
  • This collection covers all the species of the class Amphibia, both native and introduced, that occur in the Portuguese territory - comprising six species of Urodela, from the Salamandridae family, and 12 species of Anura, from the following families: Discoglossidae, Pelobatidae, Pelodytidae, Bufonidae, Hylidae and Ranidae. (gbif.org)
  • This frog species is sort of like the Typhoid Mary of amphibians,' Kirksey says. (scientificamerican.com)
  • Chytridiomycosis has devastated at least 200 amphibian species globally. (scientificamerican.com)
  • More than 50 percent of amphibian species become locally extinct within six months of Bd's arrival in an area. (scientificamerican.com)
  • We used the literature to provide a historical overview of dispersal by some of the world's major invasive amphibians, give examples of species that are commonly moved as stowaways and discuss historical and current amphibian trade in the region. (scielo.org.za)
  • Currently, trade in amphibians in the region is practically non-existent, suggesting potential for best practice to prevent importation of species with high invasion potential and to stop the spread of disease. (scielo.org.za)
  • In this study, we developed microsatellite markers for nine endangered amphibian species endemic to Ryukyu Islands in Japan. (nii.ac.jp)
  • As a result, a sophisticated new understanding of Xenopus development has emerged, which ensures the species continued prominent position among the organisms favored for biological investigation. (cshlpress.com)
  • Vertebrate amphibian tadpoles of the species Xenopus laevis and Xenopus tropicalis have remarkable abilities to regenerate their tails following amputation, through the coordinated activity of numerous growth factor signalling pathways, including the Wnt, Fgf, Bmp, Notch and TGF-β pathways. (nih.gov)
  • Here, we show that Xenopus tadpole tail amputation induces a sustained production of reactive oxygen species (ROS) during tail regeneration. (nih.gov)
  • The frogs occurring on the islands of Fernando Póo, Principe, Sao Tomé and Annobón represent the species Xenopus andrei (Loumont 1983). (amphibiaweb.org)
  • id: 1039 AKEF, M.S.A. (1998): Comparison of acclamatory patterns of two species of the genus Bufo in Egypt (Amphibia, Bufonidae). (amphibiaweb.org)
  • While many species of amphibians have been studied by scientists, the one that stands out in genetics is the African clawed frog, Xenopus laevis. (yourgenome.org)
  • They are a hardy, long-lived and fully aquatic amphibian species. (stanford.edu)
  • The exotic Xenopus laevis was the only species that tested completely negative for Bd. (usgs.gov)
  • Two features of X. laevis that have hindered genetic studies are the long generation time (1 to 2 years) and the tetraploid genome of this species. (biomedcentral.com)
  • For more than a century amphibian species have been used as model organisms for the study of vertebrate development [ 1 ]. (biomedcentral.com)
  • Third, many amphibian species lay vast numbers of eggs, providing adequate numbers for study. (biomedcentral.com)
  • We have recently cloned a third type of TRH receptor in Xenopus laevis (xTRHR3) that has not yet been characterized in any other vertebrate species. (xenbase.org)
  • Here we report the findings of the second Global Amphibian Assessment, evaluating 8,011 species for the International Union for Conservation of Nature Red List of Threatened Species. (bvsalud.org)
  • We find that amphibians are the most threatened vertebrate class (40.7% of species are globally threatened). (bvsalud.org)
  • Xenopus laevis is a widespread invasive amphibian species in Chile. (bvsalud.org)
  • To obtain more information about the origin of ranavirus in Chile, its distribution, species affected, and the role of invasive amphibians and freshwater fish in the epidemiology of ranavirus, a surveillance study comprising wild and farmed amphibians and wild fish over a large latitudinal gradient (2,500 km) was carried out in 2015-2017. (bvsalud.org)
  • No other amphibian or fish species tested were positive for ranavirus, suggesting ranavirus is not threatening native Chilean species yet. (bvsalud.org)
  • Ecotoxicological amphibian studies often use tropical species (especially Xenopus laevis ). (uni-landau.de)
  • You will conduct aquatic acute toxicity tests with several German amphibian species using three pesticides that are applied in European agriculture (folpet, dimethoate, glyphosate) to derive median lethal concentrations (96-h LC50). (uni-landau.de)
  • Cyp26 genes have been previously characterized in various species, but their function in Xenopus leavis have not yet been fully identified. (molcells.org)
  • The main model is the metamorphosis of the amphibians Xenopus laevis , a species well studied as a developmental model, and Xenopus troplicalis , a species more recently developed as a model system and whose shorter life cycle and sequenced genome offers some unique advantages. (nih.gov)
  • cluster genes in Xenopus laevis and tropicalis. (xenbase.org)
  • Comparative expression analysis of the neurogenins in Xenopus tropicalis and Xenopus laevis. (xenbase.org)
  • The frogs Xenopus laevis and Xenopus tropicalis undergo temporally restricted regenerative healing of appendage amputations and spinal cord truncations, injuries that are both devastating and relatively common in human patients. (frontiersin.org)
  • The genome of Xenopus tropicalis was sequenced in 2010 - the first sequence of an amphibian. (yourgenome.org)
  • The solution came in the form of a close cousin of Xenopus laevis , Xenopus tropicalis . (yourgenome.org)
  • X. tropicalis is smaller than X. laevis , has a shorter life cycle (it matures in about four months) and has a small diploid genome (two copies of each chromosome rather than four). (yourgenome.org)
  • There were high hopes that X. tropicalis would have all the advantages of X. laevis and simpler genetics as well. (yourgenome.org)
  • The high quality sequence has aided researcher's using Xenopus tropicalis , to have a better understanding of its embryo development and cell biology. (yourgenome.org)
  • Studying both X. laevis and X. tropicalis has enabled scientists to discover much about the early three-dimensional development of the embryo after initial fertilisation. (yourgenome.org)
  • Degenerative Osteoarthropathy in Laboratory Housed Xenopus (Silurana) tropicalis. (stanford.edu)
  • The closely related frog Xenopus tropicalis shares all the features of X. laevis that make this system useful for embryonic manipulation but it develops more rapidly (sexual maturity is reached in 5 to 9 months) and has a diploid genome. (biomedcentral.com)
  • Family: Pipidae Xenopus laevis (LC) Order: Anura. (wikipedia.org)
  • Journal Article] Development and characterization of 14 microsatellite markers for Buergeria japonica (Amphibia, Anura, Rhacophoridae). (nii.ac.jp)
  • id: 1038 AKEF, M.S.A. (1997): A comparison of hematological characteristics and oxygen consumption of Rana levantina and Ptychadena mascareniensis (Amphibia, Anura, Ranidae) in Egypt. (amphibiaweb.org)
  • id: 1041 AKEF, M.S. & A. H. SCHNEIDER (1995): Calling bahavior and mating call pattern in the mascarene frog, Ptychadena mascareniensis, (Amphibia, Anura, Ranidae) in Egypt. (amphibiaweb.org)
  • A considerable collection of the invasive African clawed frog (Xenopus laevis Daudin, 1803) constitutes the largest series of the collection, comprising almost one third of the collection. (gbif.org)
  • Though the original stem cells came from frogs - the African clawed frog, Xenopus laevis - these so-called xenobots don't resemble any known amphibians. (livescience.com)
  • Genome evolution in the allotetraploid frog Xenopus laevis. (girinst.org)
  • The history of experimental embryology using amphibians stretches back to the 1880s, when German embryologist Wilhelm Roux removed one cell of a two-cell frog embryo . (yourgenome.org)
  • Using X. laevis embryos in the mid-1980s, it was shown that 'inducing factors' called fibroblast growth factors and activins are secreted by signalling centres in the frog. (yourgenome.org)
  • Therefore, X. laevis researchers looked to develop a simpler method to investigate the functions of genes and proteins in the development of the frog. (yourgenome.org)
  • google_adsense_in_post] Scientifically known as genus Xenopus laevis, the African clawed frog is the only frog with clawed toes. (reefland.com)
  • The frog Xenopus laevis has been an important model of vertebrate cell biology and development for many decades. (biomedcentral.com)
  • The frog Xenopus laevis has been used to study early stages of vertebrate development for more than 50 years and continues to be an important model system. (biomedcentral.com)
  • From Living Room to Lily Pad: Is the Fatal Amphibian Chytrid Fungus Spread via Pet Frogs? (scientificamerican.com)
  • Those who prefer amphibians over fish in their jar or tank aquariums, African clawed frogs could be a good option. (reefland.com)
  • The research was carried out by scientists from Tufts College and Harvard College's Wyss Institute, and concerned round 115 African clawed frogs (Xenopus laevis). (massnews.com)
  • In contrast to another amphibians, resembling salamanders, which might absolutely regenerate misplaced limbs, frogs have restricted regenerative potential. (massnews.com)
  • With the profitable analysis carried out in frogs, the scientists now plan to shift their efforts to mammals, which typically have decrease regenerative capabilities than amphibians. (massnews.com)
  • The data concerning the differentiation of embryonic olfactory and visual system of vertebrates are uncommon and those conducted as in Bufo bufo and X. laevis, do not provide data on the numbers of cells in apoptosis and mitosis (Mathis et al. (unina.it)
  • Several features of amphibian embryonic life make these animals useful as models for studying early developmental events. (biomedcentral.com)
  • The role of Cyp26 during RA utilization and the anteriorization of the neuroectoderm during the early embryonic stages of Xenopus is also unclear. (molcells.org)
  • This volume is essential reading for all investigators interested in the developmental and cell biology of Xenopus and vertebrates generally. (cshlpress.com)
  • Compensatory recruitment is a key demographic mechanism that has allowed the coexistence of populations of susceptible amphibians with Batrachochytrium dendrobatidis (Bd), a fungus causing one of the most devastating emerging infectious disease ever recorded among vertebrates. (bvsalud.org)
  • Amphibian embryos are supremely valuable in studies of early vertebrate development because they are large, handle easily, and can be obtained at many interesting stages. (cshlpress.com)
  • Xenopus embryos have been studied for years but this is a particularly exciting time for the field. (cshlpress.com)
  • This manual contains a comprehensive collection of protocols for the study of early development in Xenopus embryos. (cshlpress.com)
  • Important embryological techniques, such as grafting, which involves taking a piece of tissue and putting it somewhere else in the embryo, are very easy to do with high precision in X. laevis embryos because of their large size (usually 1mm to 1.3mm in diameter). (yourgenome.org)
  • Together, these results suggest that xCyp26c plays a specific role in anterior-posterior (A-P) neural patterning of Xenopus embryos. (molcells.org)
  • Xenopus are used to study vertebrate embryology, cellular biology, biomedical-physiology, toxicology and biochemistry. (stanford.edu)
  • The study of amphibian embryogenesis has provided important insight into the mechanisms of vertebrate development. (biomedcentral.com)
  • His laboratory has been studying the molecular basis of thyroid hormone regulation of vertebrate development by using Xenopus metamorphosis as a model system. (nih.gov)
  • Dr. Shi has published over 240 research papers and reviews/book chapters, edited three books, and written a monograph on amphibian metamorphosis. (nih.gov)
  • Organ-Specific Requirements for Thyroid Hormone Receptor Ensure Temporal Coordination of Tissue-Specific Transformations and Completion of Xenopus Metamorphosis. (nih.gov)
  • In urodele amphibians such as axolotls and newts, the same injury is followed by scarless regenerative healing that can fully restore both the lost tissue and its function (reviewed in Tanaka, 2016 ). (frontiersin.org)
  • Sequential expression of multiple POU proteins during amphibian early development. (wikigenes.org)
  • Histone H2B gene transcription during Xenopus early development requires functional cooperation between proteins bound to the CCAAT and octamer motifs. (wikigenes.org)
  • We aim to procure extensive and updated information on the evolutionary history of amphibians and their transition from water to land-that is, the changes seen in their skin from the larval stages to adulthood from the points of morphology, physiology, and immunology. (mdpi.com)
  • Patterns of hypothalamic regionalization in amphibians and reptiles: common traits revealed by a genoarchitectonic approach. (xenbase.org)
  • CRARC (Catalonian Reptiles and Amphibians Rescue Center). (researchgate.net)
  • Bannikov A. G., Darevsky I. S., Ishchenko V. G., Rustamov A. K., and Shcherbak N. N. (1977), Guide to the Amphibians and Reptiles of the Fauna of the USSR , Prosveshchenie, Moscow [in Russian]. (folium.ru)
  • The remarkable regenerative capabilities of amphibians have captured the attention of biologists for centuries. (frontiersin.org)
  • X. laevis is allotetraploid (four copies of each chromosome, rather than two like us) which makes it very difficult to knock out a gene to investigate its function. (yourgenome.org)
  • Still widely used in genetics and developmental biology research, X. laevis remain popular pets. (scientificamerican.com)
  • Information on amphibian biology and conservation. (wikipedia.org)
  • Roger Sauterer and James R. Rayburn "Introducing Environmental Toxicology in Instructional Labs: The Use of a Modified Amphibian Developmental Toxicity Assay to Support Inquiry-Based Student Projects," The American Biology Teacher 74(7), 496-502, (1 September 2012). (bioone.org)
  • X. laevis is the only amphibian where true lymphoid tumors have been discovered and cell lines have been obtained opening new avenues for tumor biology and tumor immunity. (rochester.edu)
  • My research focuses on the biology, health and disease of laboratory Xenopus. (stanford.edu)
  • Duellman W. E. and Trueb L. (1986), Biology of Amphibians, McGrow-Hill, New York. (folium.ru)
  • id: 1040 AKEF, M.S.A. & H. SCHNEIDER (1993): Reproductive behavior and mating call pattern in Degen's toad, Bufo vittatus, in Egypt (Bufonidae, Amphibia). (amphibiaweb.org)
  • Globally, invasive amphibians are known for their environmental and social impacts that range from poisoning of local fauna and human populations to direct predation on other amphibians. (scielo.org.za)
  • The African continent is remarkably free of many introduced and invasive amphibians that are prevalent elsewhere. (scielo.org.za)
  • Xenbase: The Xenopus Model Organism Knowledgebase. (xenbase.org)
  • As a model organism Xenopus laevis has a number of key benefits, from the ease in which they can be kept, to their abundant supply of large, robust eggs that can be simply manipulated in the lab. (yourgenome.org)
  • From the 1950s onwards X. laevis gradually became the organism of choice for developmental studies. (yourgenome.org)
  • Ranaviruses have been associated with amphibian, fish and reptile mortality events worldwide and with amphibian population declines in parts of Europe. (bvsalud.org)
  • The updated Red List Index shows that the status of amphibians is deteriorating globally, particularly for salamanders and in the Neotropics. (bvsalud.org)
  • Our results show a restricted range of ranavirus infection in central Chile, coinciding with X. laevis presence, and suggest that FV3 may have entered the country through infected X. laevis, which appears to act as a competent reservoir host, and may contribute to the spread the virus locally as it invades new areas, and globally through the pet trade. (bvsalud.org)
  • it shares all of the physical characteristics that make X. laevis a useful model but has the advantage of a diploid genome and short generation time. (biomedcentral.com)
  • In total, 1,752 amphibians and 496 fish were tested using a ranavirus-specific qPCR assay, and positive samples were analyzed for virus characterization through whole genome sequencing of viral DNA obtained from infected tissue. (bvsalud.org)
  • Studies on Xenopus laevis intestine reveal biological pathways underlying vertebrate gut adaptation from embryo to adult. (nih.gov)
  • These results have contributed to effective conservation and enabled genetic management of ex-situ conservation activities of these endangered amphibians. (nii.ac.jp)
  • Kraus (2008) lists 24 amphibian introductions in African countries, with only 14 successful. (scielo.org.za)
  • Distribution of the mRNAs encoding the thyrotropin-releasing hormone ( TRH ) precursor and three TRH receptors in the brain and pituitary of Xenopus laevis: effect of background color adaptation on TRH and TRH receptor gene expression. (xenbase.org)
  • To identify genes involved in the anterior neural specification, we analyzed gene expression profiles using a Xenopus Affymetrix Gene Chip after BMP-4 inhibition in animal cap explants. (molcells.org)
  • The skin, as well as many other organs in the amphibian body, has undergone the most extensive rearrangement in the adaptation from water to land. (mdpi.com)
  • Amphibians have undergone behavioral, morphological, and lifestyle-based evolutionary processes that have tolerated their existence for millions of years, before and after dinosaurs [ 1 ]. (mdpi.com)
  • This will enable you to compare the sensitivities of German amphibians and to investigate the variability between substances. (uni-landau.de)
  • There is therefore no scientific standard available to provide an early warning in the event of substances toxic to amphibians entering the Sustainable Urban Drainage System (SUD system). (willwatsonecology.com)
  • Despite being small, the amphibians collection of the Museu Nacional de História Natural e da Ciência, Universidade de Lisboa, Portugal, is the largest in the country, and one of the largest in the world, regarding Portuguese amphibian fauna. (gbif.org)
  • Here we review recent insights into the biophysical, biochemical, and epigenetic processes that underlie regenerative healing in amphibians, focusing particularly on tail and limb regeneration in Xenopus . (frontiersin.org)
  • In situ hybridization histochemistry showing the distribution of TRH precursor mRNA in the brain and pituitary of Xenopus laevis. (xenbase.org)
  • Darkfield photomicrographs illustrating the localization of TRH precursor mRNA hybridization signal in selected regions of the brain of white-adapted Xenopus laevis. (xenbase.org)
  • This wellknown fact has prompted several basic studies on organisms capable of adult regeneration, such as amphibians, bony fish, and invertebrates. (unimore.it)
  • The earliest known case ( pdf ) of chytridiomycosis was documented in an X. laevis individual that had been collected in South Africa in 1938. (scientificamerican.com)
  • X. laevis LG15 cloned adult injected sc with 10,000 15/0 tumor cells. (rochester.edu)
  • We explore potential mechanisms of compensatory recruitment in response to Bd infection by taking advantage of an amphibian system where male reproductive traits are easy to quantify in free-living populations. (bvsalud.org)
  • A 1700 base pair cDNA for a putative Magadi tilapia urea transporter (mtUT) was cloned, sequenced and found to display high homology with urea transporters from mammals, amphibians and other fishes. (mcmaster.ca)
  • Structural and physiological features of skin in amphibians are presented within this review. (mdpi.com)
  • The 96 kDa protein kinase activated by oncogenic Ras in Xenopus egg extracts is also activated by constitutively active Mek: activation requires serine/threonine phosphorylation. (wikigenes.org)
  • Xenopus are a major, non-mammalian laboratory animal model. (stanford.edu)
  • This dataset contains data from an amphibian collection that includes specimens from many different origins and studies. (gbif.org)
  • This temporally restricted regenerative competence therefore makes Xenopus an appealing model for defining the features that enable or inhibit regenerative healing. (frontiersin.org)
  • In amphibians, thyrotropin-releasing hormone ( TRH ) is a potent stimulator of alpha-melanotropin (alpha-MSH) secretion, so TRH plays a major role in the neuroendocrine regulation of skin -color adaptation. (xenbase.org)
  • And of all the amphibians available for study, the most valuable is Xenopus laevis, which is easy to keep and ovulates at any time of year in response to simple hormone injections. (cshlpress.com)