Results 121 to 130 of about 3,194 (177)

Gynogenesis and Hybridization between Ambystoma platineum and Ambystoma texanum in Illinois

Copeia, 1984
Two kinds of virtually unisexual, polyploid Ambystoma occur at Kickapoo State Park, Vermilion Co., Illinois. One is the triploid (3n = 42) A. platineum. The other is a tetraploid (4n = 56) hybrid A. platineum x A. texanum. Eggs of A. platineum from this locality do not cleave unless inseminated. There are no diploid members of the A.
Michael A. Morris, Ronald A. Brandon
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Delayed hypersensitivity in Ambystoma mexicanum

Developmental & Comparative Immunology, 1979
Abstract Ambystoma mexicanum sensitised with dinitrofluorobenzene or heat-killed Mycobacterium tuberculosis , when challenged with a supradermal application of the sensitising agent, exhibit cutaneous erythemas appearing after 4 hours. Lymphocytes and macrophages infiltrate the erythematous lesions.
A M, Tahan, R D, Jurd
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Spermatophores of the salamander Ambystoma texanum

Tissue and Cell, 1981
Living spermatozoa were observed in freshly deposited spermatophores and in fluid from vasa deferentia. In the distal, but not proximal, vas deferens spermatozoa moved together in whorls with heads and tails in alignment. Around the entire periphery of the spermatophore cap, similar slowly undulating groups of spermatozoa had their heads aligned and ...
L D, Russell, R A, Brandon, E J, Zalisko, J, Martan   +3 more
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Migratory Orientation and Homing in Ambystoma maculatum and Ambystoma opacum

Copeia, 1985
Migratory headings of adult Ambystoma maculatum and A. opacum and juvenile A. opacum were monitored via captures at a drift fence surrounding a temporary pond. Adult individuals of both species tended to enter and leave by the same route. Points of entry for two breeding seasons were found to be significantly positively correlated for A.
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Hydroperiod Impacts on the Fall-Breeding Ambystomatid Salamanders Ambystoma annulatum and Ambystoma opacum

Ichthyology & Herpetology, 2023
Wetland hydroperiod affects the ecology and evolution of numerous freshwater organisms. Pond-breeding amphibians are particularly affected by hydroperiod, with their life histories and distributional patterns often resulting from how long ponds remain inundated.
Thomas L. Anderson, Mariah N. Mack, Jessica L. Sandoval   +2 more
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Transgenesis in Axolotl (Ambystoma mexicanum)

2015
Transgenic animals have been indispensable in elucidating and deciphering mechanisms underlying various biological phenomena. In regeneration, transgenic animals expressing fluorescent protein genes have been crucial for identifying the source cells for regeneration and the mechanism of blastema formation.
Shahryar, Khattak, Elly M, Tanaka
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Pigment pattern formation in larval ambystomatid salamanders: Ambystoma talpoideum, Ambystoma barbouri, and Ambystoma annulatum

Journal of Morphology, 1994
AbstractThe pigment pattern formation in embryos and larvae of three ambystomatid salamanders was investigated in an evolutionary context. Early neural crest development was studied with scanning electron microscopy. Pigment cell migration and pattern formation were investigated at the light microscopy level with markers that labelled the two pigment ...
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Brachycoelium ambystomae sp. n. (Trematoda: Brachycoeliidae) from Ambystoma opacum

The Journal of Parasitology, 1966
Brachycoelium ambystomae sp. n. is described from the marbled salamander, Ambystoma opacum (Gravenhorst), from Leon County, Florida. This species differs chiefly from the 11 other described members of the genus by its spination, distribution and development of vitellaria, position and size of its ovary and testes, and body length.
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The cardiac neural crest in Ambystoma mexicanum

The International Journal of Developmental Biology, 1999
To establish whether a region of the cranial neural crest contributes cells to the developing heart of Ambystoma mexicanum (axolotl), as it does in many other vertebrates, we constructed a fate map for the neural crest in late neurula stage (stage 19-20) embryos. The fluorescent vital dye, Dil, was used as the lineage label.
N S, Bashir, J B, Armstrong
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The Early Life History and Ecology of Ambystoma tigrinum and Ambystoma opacum in New Jersey

American Midland Naturalist, 1970
Sympatric populations of Ambystoma opacum and Ambystoma t. tigrinum were studied in ponds on the coastal plain of New Jersey. Ambystoma tigrinum bred during the "January thaw" and its eggs remained under ice for a month after deposition. Eggs were laid in the deepest parts of the ponds.
Dawn D. Hassinger, James D. Anderson, George H. Dalrymple   +2 more
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