keyword
MENU ▼
Read by QxMD icon Read
search

Tadpole

keyword
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
#1
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/28990472/an-inhibitor-of-thyroid-hormone-synthesis-protects-tail-skin-grafts-transplanted-to-syngenic-adult-frogs
#2
Yuya Nakai, Keisuke Nakajima, Yoshio Yaoita
Tail regression in amphibian tadpoles during metamorphosis is one of the most dynamic morphological changes in animal development and is induced by thyroid hormone (TH). It has been proposed that tail resorption is driven by immunological rejection in Xenopus laevis, based on experimental evidence showing that larval skin grafts become atrophic on syngenic recipient adult frogs. This led to the hypothesis that tail regression is induced by an immunological rejection against larval skin-specific antigens called Ouro proteins...
October 2017: Zoological Science
https://www.readbyqxmd.com/read/28988394/desert-amphibian-selection-of-arid-land-breeding-habitat-undermines-reproductive-effort
#3
Anja B Kiesow, Kerry L Griffis-Kyle
Understanding how animals select habitat is important for understanding how to better conserve those species. As droughts become more frequent and water availability declines in many systems, understanding selection of water sources becomes even more important for conservation. Tinajas and anthropogenic catchments are critical ephemeral breeding sites for Sonoran Desert anurans. Tadpoles have been documented in both water types even though anthropogenic catchments can contain very high concentrations of ammonia...
October 7, 2017: Oecologia
https://www.readbyqxmd.com/read/28977045/estimation-of-a-closed-population-size-of-tadpoles-in-temporary-pond
#4
M S C S Lima, J Pederassi, C A S Souza
The practice of capture-recapture to estimate the diversity is well known to many animal groups, however this practice in the larval phase of anuran amphibians is incipient. We aimed at evaluating the Lincoln estimator, Venn diagram and Bayes theorem in the inference of population size of a larval phase anurocenose from lotic environment. The adherence of results was evaluated using the Kolmogorov-Smirnov test. The marking of tadpoles for later recapture and methods measurement was made with eosin methylene blue...
September 28, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28965719/numerical-and-experimental-study-of-mechanisms-involved-in-boiling-histotripsy
#5
Ki Joo Pahk, Pierre Gélat, David Sinden, Dipok Kumar Dhar, Nader Saffari
The aim of boiling histotripsy is to mechanically fractionate tissue as an alternative to thermal ablation for therapeutic applications. In general, the shape of a lesion produced by boiling histotripsy is tadpole like, consisting of a head and a tail. Although many studies have demonstrated the efficacy of boiling histotripsy for fractionating solid tumors, the exact mechanisms underpinning this phenomenon are not yet well understood, particularly the interaction of a boiling vapor bubble with incoming incident shockwaves...
September 28, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28964734/behavioral-and-molecular-analyses-of-olfaction-mediated-avoidance-responses-of-rana-lithobates-catesbeiana-tadpoles-sensitivity-to-thyroid-hormones-estrogen-and-treated-municipal-wastewater-effluent
#6
Jody L Heerema, Kevin W Jackman, Rachel C Miliano, Linda Li, Tristan S M Zaborniak, Nik Veldhoen, Graham van Aggelen, Wayne J Parker, Gregory G Pyle, Caren C Helbing
Olfaction is critical for survival, facilitating predator avoidance and food location. The nature of the olfactory system changes during amphibian metamorphosis as the aquatic herbivorous tadpole transitions to a terrestrial, carnivorous frog. Metamorphosis is principally dependent on the action of thyroid hormones (THs), l-thyroxine (T4) and 3,5,3'-triiodothyronine (T3), yet little is known about their influence on olfaction during this phase of postembryonic development. We exposed Taylor Kollros stage I-XIII Rana (Lithobates) catesbeiana tadpoles to physiological concentrations of T4, T3, or 17-beta-estradiol (E2) for 48h and evaluated a predator cue avoidance response...
October 4, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28954912/trust-thy-neighbour-in-times-of-trouble-background-risk-alters-how-tadpoles-release-and-respond-to-disturbance-cues
#7
Kevin R Bairos-Novak, Matthew D Mitchell, Adam L Crane, Douglas P Chivers, Maud C O Ferrari
In aquatic environments, uninjured prey escaping a predator release chemical disturbance cues into the water. However, it is unknown whether these cues are a simple physiological by-product of increased activity or whether they represent a social signal that is under some control by the sender. Here, we exposed wood frog tadpoles (Lithobates sylvaticus) to either a high or low background risk environment and tested their responses to disturbance cues (or control cues) produced by tadpoles from high-risk or low-risk backgrounds...
September 27, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28954856/time-lagged-effect-of-predators-on-tadpole-behaviour-and-parasite-infection
#8
Janet Koprivnikar, Theresa M Y Urichuk
Prey should adjust their defences against natural enemies to match their current level of risk and balance other needs. This is particularly important when optimal defences represent trade-offs, as is the case with many predator-induced trait-mediated indirect effects (TMIEs) that are antagonistic to those promoting host resistance to parasites and pathogens. However, trade-offs may depend on whether different natural enemies are present simultaneously or represent temporally discrete threats. We found that larval amphibians (Anaxyrus americanus) previously exposed to predator cues did not engage in anti-parasite behaviours (activity increases) in response to a current risk of infection by a pathogenic trematode parasite compared to controls, resulting in higher infection intensities...
September 2017: Biology Letters
https://www.readbyqxmd.com/read/28937758/monomeric-huntingtin-exon-1-has-similar-overall-structural-features-for-wild-type-and-pathological-polyglutamine-lengths
#9
John B Warner, Kiersten Ruff, Piau Siong Tan, Edward A Lemke, Rohit V Pappu, Hilal A Lashuel
Huntington's disease is caused by expansion of a polyglutamine (polyQ) domain within exon 1 of the huntingtin gene (Httex1). A popular hypothesis is that the Httex1 protein undergoes sharp conformational changes as the polyQ length exceeds a threshold of 36 residues. We test this hypothesis by combining novel semi-synthesis strategies with state-of-the-art single molecule Förster resonance energy transfer measurements on biologically relevant Httex1 proteins of five different polyQ lengths. Our results, integrated with atomistic simulations, negate the hypothesis of a sharp, polyQ length-dependent change in the structure of monomeric Httex1...
September 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28936635/competition-and-pesticide-exposure-affect-development-of-invasive-rhinella-marina-and-native-fejervarya-vittigera-rice-paddy-amphibian-larvae
#10
Molly E Shuman-Goodier, Grant R Singleton, Catherine R Propper
Increased pesticide use in rice agricultural ecosystems may alter competitive interactions between invasive and native amphibian species. We conducted an experiment with two rice paddy amphibians found in Luzon, Philippines, the invasive cane toad (Rhinella marina) and the endemic Luzon wart frog (Fejervarya vittigera), to determine whether exposure to a common herbicide, butachlor, drives competitive interactions in favor of the invasive amphibian. Our results revealed that competition had a strong effect on the development of both species, but in opposing directions; Luzon wart frog tadpoles were smaller and developed slower than when raised alone, whereas cane toad tadpoles were larger and developed faster...
September 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28929563/morphology-dependent-cell-imaging-by-a-self-assembled-diacetylene-peptide-amphiphile
#11
Carsten Schmuck, Hao Jiang, Xiao-Yu Hu, Stefanie Schlesiger, Mao Li, Elio Zellermann, Shirley Knauer
Herein, a novel cationic peptide gemini amphiphile containing diacetylene motifs (DA2P) is presented which self-assembles into novel tadpole- and bola-shaped nanostructures at low concentration and nanofibers at higher concentration, respectively. Interestingly, the DA2P assemblies can be polymerized to a fluorescent red phase but only during incubation with HeLa cells, most likely owing to the reorganization of the diacetylene chains of DA2P upon interaction with the cell membrane. The red-fluorescent polymerized DA2P assemblies can serve as a novel cell imaging probe...
September 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28928245/evi-and-mds-evi-are-required-for-adult-intestinal-stem-cell-formation-during-postembryonic-vertebrate-development
#12
Morihiro Okada, Yun-Bo Shi
The gene ectopic viral integration site 1 (EVI) and its variant myelodysplastic syndrome 1 (MDS)/EVI encode zinc-finger proteins that have been recognized as important oncogenes in various types of cancer. In contrast to the established role of EVI and MDS/EVI in cancer development, their potential function during vertebrate postembryonic development, especially in organ-specific adult stem cells, is unclear. Amphibian metamorphosis is strikingly similar to postembryonic development around birth in mammals, with both processes taking place when plasma thyroid hormone (T3) levels are high...
September 19, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28926819/use-of-electro-olfactography-to-measure-olfactory-acuity-in-the-north-american-bullfrog-lithobates-rana-catesbeiana-tadpole
#13
Jody L Heerema, Caren C Helbing, Greg G Pyle
Olfaction is an important sense for aquatic organisms because it provides information about their surroundings, including nearby food, mates, and predators. Electro-olfactography (EOG) is an electrophysiological technique that measures the response of olfactory tissue to olfactory stimuli, and responses are indicative of olfactory acuity. Previous studies have used this technique on a variety of species including frogs, salamanders, daphniids and, most extensively, fish. In the present study, we introduce a novel modified EOG method for use on Lithobates (Rana) catesbeiana tadpoles...
September 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28917944/tetrabromoethylcyclohexane-affects-gonadal-differentiation-and-development-in-the-frog-pelophylax-nigromaculatus
#14
Peng-Yan Liu, Tan Meng, Yuan-Yuan Li, Man Cai, Xing-Hong Li, Juan Chen, Zhan-Fen Qin
Tetrabromoethylcyclohexane (TBECH), an additive brominated flame retardant, has been shown to have an androgenic activity in vitro. In the present study, we aimed to investigate the effects of TBECH on gonadal differentiation and development in the frog Pelophylax nigromaculatus, an amphibian species sensitive to androgenic chemicals, and to assess the androgenic activity of TBECH in vivo. P. nigromaculatus tadpoles were exposed to TBECH (1, 10, 100nM) from Gosner stage 24 to complete metamorphosis, and to 5α-dihydrotestosterone (DHT) as a positive control...
September 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28912375/organ-culture-of-the-xenopus-tadpole-intestine
#15
Atsuko Ishizuya-Oka
During Xenopus metamorphosis, most tadpole organs remodel from the larval to adult form to prepare for adaptation to terrestrial life. Organ culture serves as an important tool for studying larval-to-adult organ remodeling independent of the effects of other parts of the body. Here, I introduce a protocol for organ culture in vitro using the Xenopus laevis tadpole intestine before metamorphic climax. During culture in the absence of exogenous 3,3',5-triiodo-l-thyronine (T3), the most potent natural thyroid hormone, the intestine remains in its larval state without any metamorphic changes...
September 14, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28912374/collagen-embedded-tumor-transplantations-in-xenopus-laevis-tadpoles
#16
Maureen Banach, Jacques Robert
The Xenopus laevis tadpole provides a valuable model for studying tumorigenesis and tumor immunity by intravital real-time microscopy. Using well-characterized thymic lymphoid tumor lines (15/0 and ff-2) that are transplantable into their compatible hosts (LG-15 isogenic clones and the F inbred strain, respectively), a system of semisolid tumor engraftment has been designed. Because these lymphoid tumor cell lines are not adherent and grow in suspension, they are first immobilized in a matrix of type I rat tail collagen before transplantation as a semisolid tumor graft under the transparent dorsal skin in the head region of a tadpole...
September 14, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28904296/developmental-changes-in-drug-metabolizing-enzyme-expression-during-metamorphosis-of-xenopus-tropicalis
#17
Junpei Mori, Seigo Sanoh, Keiko Kashiwagi, Hideki Hanada, Mitsuki Shigeta, Ken-Ichi T Suzuki, Takashi Yamamoto, Yaichiro Kotake, Kazumi Sugihara, Shigeyuki Kitamura, Akihiko Kashiwagi, Shigeru Ohta
A large number of chemicals are routinely detected in aquatic environments, and these chemicals may adversely affect aquatic organisms. Accurate risk assessment requires understanding drug-metabolizing systems in aquatic organisms because metabolism of these chemicals is a critical determinant of chemical bioaccumulation and related toxicity. In this study, we evaluated mRNA expression levels of nuclear receptors and drug-metabolizing enzymes as well as cytochrome P450 (CYP) activities in pro-metamorphic tadpoles, froglets, and adult frogs to determine how drug-metabolizing systems are altered at different life stages...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28903092/lethal-and-sublethal-effects-of-the-pirimicarb-based-formulation-aficida-%C3%A2-on-boana-pulchella-dum%C3%A3-ril-and-bibron-1841-tadpoles-anura-hylidae
#18
G S Natale, J Vera-Candioti, C Ruiz de Arcaute, S Soloneski, M L Larramendy, A E Ronco
Acute lethal and sublethal toxicity of the pirimicarb-based commercial formulation Aficida(®) were evaluated on Boana pulchella tadpoles. Whereas mortality was used as end point for lethality, frequency of micronuclei and other nuclear abnormalities as well as alterations in the frequency of erythroblasts in circulating blood as biomarkers for genotoxicity and cytotoxicity, respectively. Swimming, growth, developmental and morphological abnormalities were also employed as sublethal end points. Results show that the species is within the 13th percentile of the distribution of acute sensitivity of species to pirimicarb for aquatic vertebrates...
September 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28898778/effects-of-imidacloprid-on-rana-catesbeiana-immune-and-nervous-system
#19
Francesca M Rios, Travis E Wilcoxen, Laura M Zimmerman
Imidacloprid (IMD), a neonicotinoid, is generally considered to be of low toxicity in vertebrates. However, the inhibition of acetylcholine (ACh) receptors can have a profound effect on both the immune and nervous system due to the anti-inflammatory effects of ACh. Vertebrates, such as amphibians, might be affected by IMD because they breed in wetlands where the concentration of IMD is high. In our study, we experimentally exposed Rana catesbeiana tadpoles to environmentally relevant IMD and then quantified the ACh and antibody to non-replicating antigens...
August 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/28895048/effects-of-abamectin-on-bullfrog-tadpoles-insights-on-cytotoxicity
#20
Mateus Flores Montalvão, Guilherme Malafaia
Abamectin is one of the most used pesticides worldwide. However, investigations about its effects on amphibian populations are rare. Thus, the present study sought to investigate possible cytotoxic effects on Lithobates catesbeianus tadpoles exposed to low abamectin concentrations diluted in water. Accordingly, four experimental groups were set: negative control, positive control (cyclophosphamide-40 mL L(-1)), abamectin at concentrations 36 μg a.i./L (ABA36 group), and 72 μg a.i./L (ABA72 group), applied as Kraft® 36EC...
September 11, 2017: Environmental Science and Pollution Research International
keyword
keyword
39800
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"