keyword
MENU ▼
Read by QxMD icon Read
search

Amphibians

keyword
https://www.readbyqxmd.com/read/29053961/maturation-of-xenopus-laevis-oocytes-under-cadmium-and-lead-exposures-cell-biology-investigations
#1
Sylvain Slaby, Julie Hanotel, Guillaume Marchand, Arlette Lescuyer, Jean-François Bodart, Alain Leprêtre, Sébastien Lemière, Matthieu Marin
Since amphibians are recognised as good models to assess the quality of environments, only few studies have dealt with the impacts of chemical contaminants on their gametes, while toxic effects at this stage will alter all the next steps of their life cycle. Therefore, we propose to investigate the oocyte maturation of Xenopus laevis in cadmium- and lead-contaminated conditions. The impacts of cadmium and lead ions were explored on events involved in the hormone-dependent process of maturation. In time-course experiments, cadmium, at the highest concentration, delayed and prevented the germinal vesicle breakdown...
October 16, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29052233/heterogeneous-expression-of-glycoconjugates-in-the-primary-olfactory-centre-of-the-japanese-sword-tailed-newt-cynops-ensicauda
#2
T Matsui, K Tanaka, Y Kobayashi
Histochemical organization of the Caudata olfactory system remains largely unknown, despite this amphibian order showing phylogenetic diversity in the development of the vomeronasal organ and its primary centre, the accessory olfactory bulb. Here, we investigated the glycoconjugate distribution in the olfactory bulb of a semi-aquatic salamander, the Japanese sword-tailed newt (Cynops ensicauda), by histochemical analysis of the lectins that were present. Eleven lectins showed a specific binding to the olfactory and vomeronasal nerves as well as to the olfactory glomeruli...
October 19, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/29051999/comparative-early-life-stage-toxicity-of-the-african-clawed-frog-xenopus-laevis-following-exposure-to-selected-herbicide-formulations-applied-to-eradicate-alien-plants-in-south-africa
#3
Oluwaseun O Babalola, J H Van Wyk
The rise in pesticides application has increased the need for better understanding of their ecological impacts. The global amphibian declines, for example, have been positively correlated with pesticides use. The differential susceptibility in the developmental stages of amphibians to chemical substances are still largely unknown. We examined the 96-h differential toxicity responses of embryos, premetamorphic and transitional larval stage of Xenopus laevis, to six formulated aquatic herbicide products containing the active ingredients of diquat dibromide (Midstream), glufosinate ammonium (Basta), imazapyr (Arsenal), and three glyphosate formulations (Roundup, Kilo Max, and Environ Glyphosate)...
October 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29051315/future-of-keeping-pet-reptiles-and-amphibians-towards-integrating-animal-welfare-human-health-and-environmental-sustainability
#4
REVIEW
Frank Pasmans, Serge Bogaerts, Johan Braeckman, Andrew A Cunningham, Tom Hellebuyck, Richard A Griffiths, Max Sparreboom, Benedikt R Schmidt, An Martel
The keeping of exotic pets is currently under debate and governments of several countries are increasingly exploring the regulation, or even the banning, of exotic pet keeping. Major concerns are issues of public health and safety, animal welfare and biodiversity conservation. The keeping of reptiles and amphibians in captivity encompasses all the potential issues identified with keeping exotic pets, and many of those relating to traditional domestic pets. Within the context of risks posed by pets in general, the authors argue for the responsible and sustainable keeping of reptile and amphibian pets by private persons, based on scientific evidence and on the authors' own expertise (veterinary medicine, captive husbandry, conservation biology)...
October 19, 2017: Veterinary Record
https://www.readbyqxmd.com/read/29046479/lipoprotein-lipase-reaches-the-capillary-lumen-in-chickens-despite-an-apparent-absence-of-gpihbp1
#5
Cuiwen He, Xuchen Hu, Rachel S Jung, Mikael Larsson, Yiping Tu, Sandra Duarte-Vogel, Paul Kim, Norma P Sandoval, Tara R Price, Christopher M Allan, Brian Raney, Haibo Jiang, André Bensadoun, Rosemary L Walzem, Richard I Kuo, Anne P Beigneux, Loren G Fong, Stephen G Young
In mammals, GPIHBP1 is absolutely essential for transporting lipoprotein lipase (LPL) to the lumen of capillaries, where it hydrolyzes the triglycerides in triglyceride-rich lipoproteins. In all lower vertebrate species (e.g., birds, amphibians, reptiles, fish), a gene for LPL can be found easily, but a gene for GPIHBP1 has never been found. The obvious question is whether the LPL in lower vertebrates is able to reach the capillary lumen. Using purified antibodies against chicken LPL, we showed that LPL is present on capillary endothelial cells of chicken heart and adipose tissue, colocalizing with von Willebrand factor...
October 19, 2017: JCI Insight
https://www.readbyqxmd.com/read/29046334/the-organic-anion-transporter-slco2a1-constitutes-the-core-component-of-the-maxi-cl-channel
#6
Ravshan Z Sabirov, Petr G Merzlyak, Toshiaki Okada, Md Rafiqul Islam, Hiromi Uramoto, Tomoko Mori, Yumiko Makino, Hiroshi Matsuura, Yu Xie, Yasunobu Okada
The maxi-anion channels (MACs) are expressed in cells from mammals to amphibians with ~60% exhibiting a phenotype called Maxi-Cl. Maxi-Cl serves as the most efficient pathway for regulated fluxes of inorganic and organic anions including ATP However, its molecular entity has long been elusive. By subjecting proteins isolated from bleb membranes rich in Maxi-Cl activity to LC-MS/MS combined with targeted siRNA screening, CRISPR/Cas9-mediated knockout, and heterologous overexpression, we identified the organic anion transporter SLCO2A1, known as a prostaglandin transporter (PGT), as a key component of Maxi-Cl...
October 18, 2017: EMBO Journal
https://www.readbyqxmd.com/read/29046317/vasoactivity-of-nitrite-in-the-iliac-artery-of-the-toad-rhinella-marina
#7
Leonard George Forgan, Melenaite Sofele, Bryony Alice McNeill, Melissa S Cameron, John A Donald
Nitrite (NO2(-)) causes vasodilation in mammals due to the formation of (nitric oxide) NO by endogenous NO2(-) reduction in the vascular wall. In this study, we determined if a similar mechanism operates in amphibians. Dual-wire myography of the iliac artery from Rhinella marina showed that applied NO2(-) caused a concentration-dependent vasodilation in normoxia (21% O2; EC50 438 µM). Hypoxia (0.63% O2) significantly increased the maximal dilation to NO2(-) by 5 % (P = 0.0398). The addition of oxyhemoglobin significantly increased the EC50 (P = 0...
October 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29043029/prevalence-and-genetic-diversity-of-batrachochytrium-dendrobatidis-in-central-african-island-and-continental-amphibian-communities
#8
Marina E Hydeman, Ana V Longo, Guillermo Velo-Antón, David Rodriguez, Kelly R Zamudio, Rayna C Bell
The fungal pathogen Batrachochytrium dendrobatidis (Bd) infects hundreds of amphibian species and is implicated in global amphibian declines. Bd is comprised of several lineages that differ in pathogenicity, thus, identifying which Bd strains are present in a given amphibian community is essential for understanding host-pathogen dynamics. The presence of Bd has been confirmed in Central Africa, yet vast expanses of this region have not yet been surveyed for Bd prevalence, and the genetic diversity of Bd is largely unknown in this part of the world...
October 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29043018/invasive-cane-toads-are-unique-in-shape-but-overlap-in-ecological-niche-compared-to-australian-native-frogs
#9
Marta Vidal-García, J Scott Keogh
Invasive species are an important issue worldwide but predicting invasiveness, and the underlying mechanisms that cause it, is difficult. There are several primary hypotheses to explain invasion success. Two main hypothesis based on niche spaces stand out as alternative, although not exclusive. The empty niche hypothesis states that invaders occupy a vacant niche space in the recipient community, and the niche competition hypothesis states that invaders overlap with native species in niche space. Studies on trait similarity/dissimilarity between the invader and native species can provide information on their niche overlap...
October 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29042136/mercury-bioaccumulation-in-bats-reflects-dietary-connectivity-to-aquatic-food-webs
#10
Daniel J Becker, Matthew M Chumchal, Hugh G Broders, Jennifer M Korstian, Elizabeth L Clare, Thomas R Rainwater, Steven G Platt, Nancy B Simmons, M Brock Fenton
Mercury (Hg) is a persistent and widespread heavy metal with neurotoxic effects in wildlife. While bioaccumulation of Hg has historically been studied in aquatic food webs, terrestrial consumers can become contaminated with Hg when they feed on aquatic organisms (e.g., emergent aquatic insects, fish, and amphibians). However, the extent to which dietary connectivity to aquatic ecosystems can explain patterns of Hg bioaccumulation in terrestrial consumers has not been well studied. Bats (Order: Chiroptera) can serve as a model system for illuminating the trophic transfer of Hg given their high dietary diversity and foraging links to both aquatic and terrestrial food webs...
October 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29040658/fire-does-not-strongly-affect-genetic-diversity-or-structure-of-a-common-treefrog-in-the-endangered-florida-scrub
#11
J M Robertson, S W Fitzpatrick, B B Rothermel, L M Chan
Fire regimes influence natural populations of organisms in diverse ways, via direct effects on population dynamics as well as indirect effects on habitat and ecosystem processes. Although many amphibian species have evolved to persist in fire-dependent ecosystems, the effects of fire on the genetic diversity of amphibian populations remain relatively unexplored. We examined how different aspects of fire history relate to population genetic diversity and structure of an abundant anuran, Hyla femoralis, in a large, intact area of Florida scrub containing hundreds of seasonally inundated ponds...
October 11, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29040327/epizootic-to-enzootic-transition-of-a-fungal-disease-in-tropical-andean-frogs-are-surviving-species-still-susceptible
#12
Alessandro Catenazzi, Andrea Swei, Jacob Finkle, Emily Foreyt, Lauren Wyman, Vance T Vredenburg
The fungal pathogen Batrachochytrium dendrobatidis (Bd), which causes the disease chytridiomycosis, has been linked to catastrophic amphibian declines throughout the world. Amphibians differ in their vulnerability to chytridiomycosis; some species experience epizootics followed by collapse while others exhibit stable host/pathogen dynamics where most amphibian hosts survive in the presence of Bd (e.g., in the enzootic state). Little is known about the factors that drive the transition between the two disease states within a community, or whether populations of species that survived the initial epizootic are stable, yet this information is essential for conservation and theory...
2017: PloS One
https://www.readbyqxmd.com/read/29038469/spatial-distribution-of-citizen-science-casuistic-observations-for-different-taxonomic-groups
#13
Patrícia Tiago, Ana Ceia-Hasse, Tiago A Marques, César Capinha, Henrique M Pereira
Opportunistic citizen science databases are becoming an important way of gathering information on species distributions. These data are temporally and spatially dispersed and could have limitations regarding biases in the distribution of the observations in space and/or time. In this work, we test the influence of landscape variables in the distribution of citizen science observations for eight taxonomic groups. We use data collected through a Portuguese citizen science database (biodiversity4all.org). We use a zero-inflated negative binomial regression to model the distribution of observations as a function of a set of variables representing the landscape features plausibly influencing the spatial distribution of the records...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29038059/first-isolation-and-characterization-of-the-pathogenic-aeromonas-veronii-bv-veronii-associated-with-ulcerative-syndrome-in-the-indigenous-pelophylax-ridibundus-of-al-ahsaa-saudi-arabia
#14
Ashraf Y Z Khalifa, Gamal Bekhet
Virulent microbial pathogen infections are the main cause for amphibian decline worldwide. In the present study, a bacterial strain named RDL-2, which was isolated from the skin of infected Pelophylax ridibundus larvae, was cultured and then phenotypically and biochemically characterized using scanning electron microscopic observations and the API20E strip and Biolog Gen III MicroPlate system. The 16S rRNA gene sequence of this strain was also obtained and used in strain identification and phylogenetic analysis...
October 13, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29037370/modeling-warming-predicts-a-physiological-threshold-for-the-extinction-of-the-living-fossil-frog-calyptocephalella-gayi
#15
Marcela A Vidal, Francisco Novoa-Muñoz, Enrique Werner, Cristian Torres, Ricardo Nova
Global climate change will have a greater impact on ectotherms in tropical and subtropical communities than at higher latitudes, because ambient temperatures are closer to the upper thermal limits of species. Amphibian species are highly dependent on external weather conditions, and the effect of global warming on these has been evaluated recently. The Great Chilean frog (Calyptocephalella gayi) is an endemic, monotypic species and genus whose conservation status is considered Vulnerable because of high extraction pressure for human consumption, lack of regulatory measures and comprehension by its consumers...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29030867/do-host-associated-gut-microbiota-mediate-the-effect-of-an-herbicide-on-disease-risk-in-frogs
#16
Sarah A Knutie, Caitlin Gabor, Kevin D Kohl, Jason R Rohr
1.Environmental stressors, such as pollutants, can increase disease risk in wildlife. For example, the herbicide atrazine affects host defenses (e.g. resistance and tolerance) of the amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd), but the mechanisms for these associations are not always clear. Given that pollutants can alter the gut microbiota of hosts, which in turn can affect their health and immune systems, one potential mechanism by which pollutants could increase infection risk is by influencing host-associated microbiota...
October 14, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/29030716/prevalence-transmission-and-host-specificity-of-cryptosporidium-spp-in-various-animal-groups-from-two-french-zoos
#17
Marwan Osman, Dima El Safadi, Sadia Benamrouz-Vanneste, Amandine Cian, Romain Moriniere, Nausicaa Gantois, Pilar Delgado-Viscogliosi, Karine Guyot, Stéphanie Bosc, Magali Chabé, Thierry Petit, Eric Viscogliosi, Gabriela Certad
Cryptosporidium represents a major cause of gastrointestinal illness in humans and animals including domestic, wild, and in captivity animals, and more than 30 validated species of Cryptosporidium are recognized as infectious to different hosts such as mammals, birds, reptiles, amphibians, and fish. Therefore, numerous investigations have been conducted worldwide in order to shed light on the epidemiology of this parasite and to explore its potential reservoirs. Few surveys, targeting humans and animals have been carried out regarding the epidemiology of Cryptosporidium spp...
October 13, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29030586/batrachochytrium-salamandrivorans-not-detected-in-u-s-survey-of-pet-salamanders
#18
Blake Klocke, Matthew Becker, James Lewis, Robert C Fleischer, Carly R Muletz-Wolz, Larry Rockwood, A Alonso Aguirre, Brian Gratwicke
We engaged pet salamander owners in the United States to screen their animals for two amphibian chytrid fungal pathogens Batrachochytrium dendrobatidis (Bd) and B. salamandrivorans (Bsal). We provided pet owners with a sampling kit and instructional video to swab the skin of their animals. We received 639 salamander samples from 65 species by mail, and tested them for Bd and Bsal using qPCR. We detected Bd on 1.3% of salamanders (95% CI 0.0053-0.0267) and did not detect Bsal (95% CI 0.0000-0.0071). If Bsal is present in the U...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29028496/are-the-damaging-effects-induced-by-the-imazethapyr-formulation-pivot-%C3%A2-h-in-boana-pulchella-anura-reversible-upon-ceasing-exposure
#19
Juan Manuel Pérez-Iglesias, Guillermo S Natale, Sonia Soloneski, Marcelo L Larramendy
In the present study, the damage recovery capabilities of Boana pulchella tadpoles after acute exposure (96h) to 0.39mg/L concentration of the imazethapyr (IMZT)-based herbicide formulation Pivot(®) H (25% IMZT LC50 value) were assessed during a period of 7 to -21 days. To appraise the recovery capabilities, frequency of micronuclei (MNs), other nuclear abnormalities and DNA single-strand breaks evaluated by single cell gel electrophoresis assay on circulating blood cells were employed as endpoints for genotoxicity...
October 10, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29027912/guanidinium-toxins-and-their-interactions-with-voltage-gated-sodium-ion-channels
#20
REVIEW
Lorena M Durán-Riveroll, Allan D Cembella
Guanidinium toxins, such as saxitoxin (STX), tetrodotoxin (TTX) and their analogs, are naturally occurring alkaloids with divergent evolutionary origins and biogeographical distribution, but which share the common chemical feature of guanidinium moieties. These guanidinium groups confer high biological activity with high affinity and ion flux blockage capacity for voltage-gated sodium channels (NaV). Members of the STX group, known collectively as paralytic shellfish toxins (PSTs), are produced among three genera of marine dinoflagellates and about a dozen genera of primarily freshwater or brackish water cyanobacteria...
October 13, 2017: Marine Drugs
keyword
keyword
48195
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"