Results 131 to 140 of about 3,194 (177)

The Axolotl Ambystoma mexicanum

1991
The axolotl is one of the classical subjects of developmental biology. Its advantages are the ease of keeping breeding stock in the laboratory, long season of reproduction, rapid sexual maturation, and the relatively large size of the eggs and their resistance to various experimental influences.
N. P. Bordzilovskaya, T. A. Dettlaff
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Hypothalamo-pituitary relations in metamorphosis of Ambystoma

General and Comparative Endocrinology, 1961
The relation of the hypothalamus to the capacity of the pituitary for inducing metamorphosis in salamander larvae was investigated by separating the two organs. Large larvae of Ambystoma maculatum collected in the New York City region were used. Five unoperated and 7 operated controls began metamorphosis in an average of 7.2 ± 0.9 days after the ...
W, ETKIN, W, SUSSMAN
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The Courtship of Ambystoma tigrinum

Copeia, 1934
Gerrhonotus scincicauda nanus, new subspecies Type.-Adult male (Mus. Vert. Zool., No. 5402); collected July 1, 1913, South Island, Los Coronados Islands, Lower California, Mexico; collector, A. B. Howell. Diagnosis.-Size small (maximum head and body length among 79 specimens 114 mm., average 93.3 among 49 evidently adult); upper two rows of temporals ...
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Inhibition of metamorphosis in Ambystoma tigrinum by prolactin

General and Comparative Endocrinology, 1970
Abstract Tiger salamander (Ambystoma tigrinum) larvae were injected intraperitoneally with either thyrotropic hormone (TSH) alone or TSH and ovine prolactin. The prolactin-injected animals showed metamorphic stasis while the TSH controls completed metamorphosis. Prolactin-thyroid antagonism appears to be a general phenomenon in Amphibia.
A G, Gona, W, Etkin
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Electrophoretic analysis of the haemoglobins of Ambystoma mexicanum

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1971
Abstract 1. 1. Ambystoma mexicanum tadpole, neotenous adult and artificially metamorphosed adult haemoglobins were analysed by polyacrylamide gel disc electrophoresis. 2. 2. Young tadpoles possess two haemoglobins which are gradually replaced by two different haemoglobins after the development of hind limbs.
N, Maclean, R D, Jurd
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Cutaneous mastocytomas in the neotenic caudate amphibians Ambystoma mexicanum (axolotl) and Ambystoma tigrinum (tiger salamander)

Journal of Cancer Research and Clinical Oncology, 1999
Spontaneous mastocytomas studied in 18 axolotls (Ambystoma mexicanum) and six tiger salamanders (Ambystoma tigrinum) were gray-white, uni- to multilobular cutaneous protrusions from 2 mm to 2 cm in diameter. Tumors were moderately cellular unencapsulated masses that usually infiltrated the dermis and hypodermis with the destruction of intervening ...
J C, Harshbarger, S C, Chang, L E, DeLanney, F L, Rose, D E, Green   +4 more
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Morphology and Infectivity of Cultivated Trypanosoma ambystomae

The Journal of Parasitology, 1994
Cultures of Trypanosoma ambystomae were initiated and maintained in hypo-osmotic biphasic blood-agar medium. Epimastigotes and trypomastigotes occurred in culture and although they were similar in size, epimastigotes predominated with about 70% of all stages. Epimastigotes divided by equal binary fission and occasionally formed rosettes.
S R, Jones, P T, Woo
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The Races of Ambystoma tigrinum

Copeia, 1940
sion that it was not possible to subdivide the general population of Ambystoma tigrinum on structural characters. I am of the same opinion, after examining much more material than was available to him. I further think that bicolor, conspersum, copeianum, trisruptum, and xiphias, which he recognized on structural characters, and of each of which he had ...
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Changes of the Lingual Epithelium in Ambystoma mexicanum

European Journal of Morphology, 1998
Changes in the lingual epithelium during ontogenesis and after induced metamorphosis in Ambystoma mexicanum are described as observed by light microscopy and scanning electron microscopy. The epithelium of the tongue is always multilayered in the larva as well as in the adult. It consists of a stratum germinativum with little differentiated basal cells
J, Wistuba, G, Clemen
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Ontogenetic Energetics in Ambystoma

Physiological Zoology, 1980
The magnitude and effects of intrapopulational variability in the sizes of eggs produced by the salamanders Ambystoma maculatum, A. opacum, and A. tigrinum have been investigated by calorimetric and respirometric procedures. It has been found that some females produce eggs with as many as 29.0 cal while others in the same population at the same time ...
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