We study the restrictions imposed by cancellation of the tadpoles for two, three, and four-form gauge fields in string theory, M-theory and F-theory compactified to two, three and four dimensions, respectively. For a large class of supersymmetric vacua, turning on a sufficient number of strings, membranes and three-branes, respectively, can cancel the tadpoles, and preserve supersymmetry. Howev...

Thyroid hormones are involved in many physiological processes, during growth, develop‐ ment, behaviour, stress. Their actions are mediated by TH receptors (TR-alpha and TR-beta), which are members of the nuclear receptor (NR) superfamily and function as ligand-activat‐ ed transcription factors. In amphibians, TR-alpha is expressed shortly after hatching and is maintained at a relatively constan...

This paper describes the tadpole and advertisement call of Phyllodytes acuminatus, based on specimens from the Parque Nacional do Catimbau, in the municipality of Buíque, State of Pernambuco, Northeastern Brazil. The overall morphology of P. acuminatus tadpole is similar to that of most species of the genus. The presence of a double row of marginal papillae surrounding all the oral apparatus (e...

Xenopus laevis were exposed to 0-855 microg cadmium (Cd)/l (measured concentrations) in FETAX medium from fertilization to 47 days postfertilization. Measurements included embryonic survival and, at 47 days, tadpole survival, snout-vent length, tail length, total length, hindlimb length, weight, Nieuwkoop-Faber (NF) stage of development, initiation of metamorphic climax (> or = NF 58), and thyr...

The forkhead gene FH1 encodes a HNF-3beta protein required for gastrulation and development of chordate features in the ascidian tadpole larva. Although most ascidian species develop via a tadpole larva, the conventional larva has regressed into an anural (tailless) larva in some species. Molgula oculata (the tailed species) exhibits a tadpole larva with chordate features (a dorsal neural senso...

We study moduli stabilization in Calabi-Yau orientifold compactifications of type IIB string theory with O3- and O7-planes. consider a three-fold Hodge number $h^{2,1}=50$ stabilize all axio-dilaton complex-structure by three-form fluxes. This is challenging task, especially for large moduli-space dimensions. To address this question we develop an algorithm to generate $10^5$ flux vacua small $...

Hamodi AS, Pratt KG. The horizontal brain slice preparation: a novel approach for visualizing and recording from all layers of the tadpole tectum. J Neurophysiol 113: 400–407, 2015. First published October 15, 2014; doi:10.1152/jn.00672.2014.—The Xenopus tadpole optic tectum is a multisensory processing center that receives direct visual input as well as nonvisual mechanosensory input. The tect...

Heyer, W. Ronald. Studies in Larval Amphibian Habitat Partitioning. Smithsonian Contributions to Zoology, number 242, 27 pages, 3 figures, 14 tables, 1976.—Habitat partitioning by larval amphibians was studied in two environments. A two-year study was undertaken at the Chesapeake Bay Center for Environmental Studies and a comparative dry and wet season study was completed at Barro Colorado Isla...

Toxicity assessments on nontarget organisms have largely been addressed using short-term, single-species laboratory experiments. Although extremely helpful, these experiments inherently lack many pervasive ecological stressors found in nature. Though a substantial challenge, incorporating these ecological stressors in contaminant studies would shed light on potential synergistic effects. For th...