Results 11 to 20 of about 10,342 (185)

Tadpoles and gauge symmetries

open access: yesJournal of High Energy Physics, 2023
The tadpole conjecture proposes that complex structure moduli stabilisation by fluxes that have low tadpole charge can be realised only at special points in moduli space, leading generically to (large) gauge symmetries.
Andreas P. Braun   +4 more
doaj   +4 more sources

The tadpole problem [PDF]

open access: yesJournal of High Energy Physics, 2021
Abstract We examine the mechanism of moduli stabilization by fluxes in the limit of a large number of moduli. We conjecture that one cannot stabilize all complex-structure moduli in F-theory at a generic point in moduli space (away from singularities) by fluxes that satisfy the bound imposed by the tadpole cancellation condition ...
Bena, Iosif   +3 more
openaire   +4 more sources

Tadpole pupil [PDF]

open access: yesNeurology, 2013
Editors' Note: Dr. Egan inquires about the possibility of Tournay phenomenon in Kawasaki and Mayer's "Tadpole pupil." Dr. Charles, in reference to "Disease-modifying drugs for multiple sclerosis in pregnancy: A systematic review," suggests that it might be appropriate to continue glatiramer acetate in women trying to conceive given the lack of evidence
Deborah I, Friedman, Aki, Kawasaki
openaire   +5 more sources

Influence of 50-Hz Electromagnetic Field on Anurian (Xenopus laevis) Metamorphosis

open access: yesThe Scientific World Journal, 2004
In this study, we show the effect of a 1-mT magnetic field AC at 50 Hz on Xenopus laevis tadpole populations. In the course of a 65-day exposure to the field, tadpole survival showed a small, but significant, decrease (p < 0.0004), together with a ...
S. Grimaldi   +5 more
doaj   +1 more source

Antipredator pheromones in amphibians: a review

open access: yesVeterinární Medicína, 2006
Specific chemosignals (pheromones) have an important role in the antipredator behaviour in amphibians and other vertebrates. However, relatively little is known about the occurrence of chemical alarm cues just in amphibians.
J. Rajchard
doaj   +1 more source

Microhabitat features determine the tadpole diversity in mountainous streams

open access: yesEcological Indicators, 2021
The study on the mechanism driving the spatial patterns of biological diversity along elevational gradients is a main focus in ecology, biogeography, and conservation biology.
Zijian Sun   +6 more
doaj   +1 more source

Does a Moderately Warming Climate Compensate for the Negative Effects of UV-B Radiation on Amphibians at High Altitudes? A Test of Rana kukunoris Living on the Qinghai–Tibetan Plateau

open access: yesBiology, 2022
Both the warming climate and ultraviolet-B radiation (UVBR) are considered to be notable environmental factors affecting amphibian population decline, with particular effects on tadpole development.
Xiaolong Tang   +7 more
doaj   +1 more source

Analytic tadpole coefficients of one-loop integrals

open access: yesJournal of High Energy Physics, 2021
One remaining problem of unitarity cut method for one-loop integral reduction is that tadpole coefficients can not be straightforward obtained through this way. In this paper, we reconsider the problem by applying differential operators over an auxiliary
Bo Feng, Tingfei Li, Xiaodi Li
doaj   +1 more source

Effects of copper on the early development of Xenopus laevis: the case of CuSO4 and Bordeaux mixture solutions

open access: yesJournal of Xenobiotics, 2018
Not available.
P. Titran   +5 more
doaj   +1 more source

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