Results 161 to 170 of about 9,057 (215)
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Developmental & Comparative Immunology, 2016
Marsupials are a group of mammals that give birth to immature young lacking mature immune tissues at birth, and are unable to mount their own specific immune defence. Their immune tissues develop in a non-sterile ex-utero environment unlike that of eutherian mammals such as ourselves.
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Marsupials are a group of mammals that give birth to immature young lacking mature immune tissues at birth, and are unable to mount their own specific immune defence. Their immune tissues develop in a non-sterile ex-utero environment unlike that of eutherian mammals such as ourselves.
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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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Veterinary Clinics of North America: Exotic Animal Practice, 2002
This article discusses ocular conditions found in marsupials. Marsupials are unique models for developmental biology because of their immature state of development at birth. There is considerable variation in the ocular evolution of marsupials, largely in response to their unique diversification. Many marsupials and their eyes have been studied.
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This article discusses ocular conditions found in marsupials. Marsupials are unique models for developmental biology because of their immature state of development at birth. There is considerable variation in the ocular evolution of marsupials, largely in response to their unique diversification. Many marsupials and their eyes have been studied.
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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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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.
P A, Simpson, J R, Blair-West
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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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Reproductive Disorders of Marsupials
Veterinary Clinics of North America: Exotic Animal Practice, 2017Marsupial reproduction differs significantly in anatomy and physiology from that of placental mammals. The gastrointestinal and urogenital tracts empty into a cloaca. Reproductive parameters include gestation and pouch time, as the fetus develops outside of the uterus. Captive marsupials discussed include sugar gliders), short-tailed opossums, Virginia
Cathy A, Johnson-Delaney +1 more
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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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