Results 201 to 210 of about 13,705 (251)

Sex determination in marsupials: evidence for a marsupial—eutherian dichotomy

Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1988
Abstract 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, 1972
SUMMARY 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, 2004
Recent 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., Arnason, U., Spencer, P.B.S., Janke, A.   +3 more
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Reproductive Disorders of Marsupials

Veterinary Clinics of North America: Exotic Animal Practice, 2017
Marsupial 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, Angela M, Lennox   +1 more
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Immunoglobulin genetics of marsupials

Developmental & Comparative Immunology, 2000
Until 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, 1968
AbstractThree 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, 1962
Summary 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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Earliest Known Marsupials

Science, 1968
The infraclass Metatheria has not been reported from deposits predating the mid-Cretaceous. Fossil material just recovered from Albian deposits in northcentral Texas has definite characteristics of the family Didelphidae and is submitted as being from the oldest known marsupials.
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Chromosomes of American Marsupials

Science, 1965
Studies 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, H I, FRITZ, W C, HARE, R A, MCFEELY   +3 more
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Marsupials

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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