Results 111 to 120 of about 6,596 (161)
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Sex determination in marsupials: evidence for a marsupial—eutherian dichotomy
Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1988Abstract In this paper, we review briefly the current state of knowledge about sexual differentiation in eutherian mammals, and then describe the situation in detail in two marsupial species: the North American opossum and the tammar wallaby.
M B, Renfree, R V, Short
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2014
Following embryonic sex determination in which the presence of a Y chromosome drives the differentiation of the primitive bipotential gonad into a testis androgens produced by the fetal testis mediate both the stabilization of structures derived from the Wolffian ducts and the closure of the urogenital sinus resulting in the male phenotype.
Biason-Lauber A +3 more
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Following embryonic sex determination in which the presence of a Y chromosome drives the differentiation of the primitive bipotential gonad into a testis androgens produced by the fetal testis mediate both the stabilization of structures derived from the Wolffian ducts and the closure of the urogenital sinus resulting in the male phenotype.
Biason-Lauber A +3 more
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Marsupial relationships and a timeline for marsupial radiation in South Gondwana
Gene, 2004Recent marsupials include about 280 species divided into 18 families and seven orders. Approximately 200 species live in Australia/New Guinea. The remaining species inhabit South America with some of these secondarily ranging into North America. In this study, we examine marsupial relationships and estimate their divergences times using complete ...
Nilsson, M.A. +3 more
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ESTIMATION OF MARSUPIAL RENIN USING MARSUPIAL RENIN-SUBSTRATE
Journal of Endocrinology, 1972SUMMARY Bilateral nephrectomy of an Eastern Grey kangaroo (Macropus giganteus) increased plasma renin-substrate concentration approximately tenfold when compared with intact kangaroos. A preparation made from this plasma had a renin-substrate concentration of 3000 ng/ml. A pH profile of rate of reaction with pig renin had an optimum at pH 5·39.
P A, Simpson, J R, Blair-West
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Immunoglobulin genetics of marsupials
Developmental & Comparative Immunology, 2000Until recently, studies of marsupial immunoglobulins were limited to primarily protein analyses, such as Protein A binding and immunological cross-reactivity to eutherian immunoglobulins to draw conclusions about the isotypes present in metatherians.
R D, Miller, K, Belov
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Marsupial interhemispheric relation
Journal of Comparative Neurology, 1968AbstractThree different responses recorded from the opossum neocortex following a stimulus to the homotopical point on the contralateral hemisphere were: the interhemispheric early response (IER), the interhemispheric delayed response (IDR), and the rhythmic afterdischarge (RA).
S J, Putnam, D, Megirian, J W, Manning
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Experiences with marsupial flaps
British Journal of Plastic Surgery, 1962Summary 1.Combination in one operation of the two stages originally described in making a marsupial flap is shown to be safe. 2.The possibility is demonstrated of making the flap longer than its width. 3.As a method of skin transfer, the marsupial flap may have two advantages over the tube.
W G, HOLDSWORTH, A D, PELLY
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Chromosomes of American Marsupials
Science, 1965Studies of the chromosomes of four American marsupials demonstrated that Caluromys derbianus and Marmosa mexicana have a diploid number of 14 chromosomes, and that Philander opossum and Didelphis marsupialis have a diploid number of 22.
J D, BIGGERS +3 more
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TOXOPLASMOSIS IN DASYURID MARSUPIALS
Journal of Wildlife Diseases, 1975During a histopathologic survey of 240 dasyurid marsupials a high prevalence of infection of Toxoplasma gondii was found in eight of thenine species examined. Amongst the infected species, endemic infection in field animals was proved in Dasyuroides byrnei, but there was also good evidence of laboratory infection probably derived from raw sheep tissues
H D, Attwood, P A, Woolley, M D, Rickard
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2006
This 2006 book examines the exciting discoveries in the study of marsupials of the last 20 years. These discoveries have led to significant developments in our understanding of this unique group of mammals. The impact of these developments have been such that marsupials are coming to be seen as model organisms in studies of life history evolution ...
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This 2006 book examines the exciting discoveries in the study of marsupials of the last 20 years. These discoveries have led to significant developments in our understanding of this unique group of mammals. The impact of these developments have been such that marsupials are coming to be seen as model organisms in studies of life history evolution ...
openaire +2 more sources