Marsupial Embryo Jumps Ahead in Development
نویسندگان
چکیده
منابع مشابه
Embryo-endometrial interactions during early development after embryonic diapause in the marsupial tammar wallaby.
The marsupial tammar wallaby has the longest period of embryonic diapause of any mammal. Reproduction in the tammar is seasonal, regulated by photoperiod and also lactation. Reactivation is triggered by falling daylength after the austral summer solstice in December. Young are born late January and commence a 9-10-month lactation. Females mate immediately after birth. The resulting conceptus de...
متن کاملThe functional development of Leydig cells in a marsupial.
Leydig cells are the major source of androgen in the male mammal. We describe here for the first time the development of the Leydig cell in a macropodid marsupial, the tammar wallaby, Macropus eugenii. Leydig cells are first recognized morphologically 2 days after birth with the appearance of lipid droplets in the cytoplasm of certain interstitial cells. Lipid content closely matches the steroi...
متن کاملEnhancement of NMRI Mouse Embryo Development In vitro
Most of the systematic studies used in the development of human embryo culture media have been done first on mouse embryos. The general use of NMRI outbred mice is a model for toxicology, teratology and pharmacology. NMRI mouse embryo exhibit the two-cell block in vitro. The objective of this study was to evaluate and compare the effects of four kinds of culture media on the development of zygo...
متن کاملInternational Development and Development Cooperation : Challenges Ahead
It is likely that the international aid system will continue to evolve along one major axis in the years to come, with a fragmented, foreign-policy focus at one end, and a more deliberate poverty focus at the other. This follows from the increasing securitisation of aid that, particularly after the events of 9/11, is likely to shift aid distribution away from where it may have the largest impac...
متن کاملModifications of oogenesis and development in marsupial frogs
Early development in animals is guided by the RNA reserves of the egg (see Davidson, 1986 for a review), and therefore variations in eggs might correlate with changes in their patterns of early development. Frogs are organisms especially suitable for analyzing the relationship of oogenesis to development, because many frog species have evolved distinctive changes to avoid or diminish their peri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Biological Sciences
سال: 2010
ISSN: 1727-3048
DOI: 10.3923/jbs.2011.78.78