Wyniki wyszukiwania:

The various species of new world blackbirds, often intermingled in large foraging flocks and nighttime roosts, collectively number in the hundreds of millions and are a dominant component of the natural and agricultural avifauna in North America today. Because of their abundance, conspicuous flocking behavior, and feeding habits, these species have often been in conflict with human endeavors.

The pioneering publications on blackbirds were by F. E. L. Beal in 1900 and A. A. Allen in 1914. These seminal treatises laid the foundation for more than 1,000 descriptive and...

The information accrued to date regarding embryonic development and stem cells have been accumulated from basic research on mouse embryonic stem cells. Since 1998, researchers have succeeded in culturing human embryonic stem cells under laboratory conditions. Human embryonic stem cell lines have been established from the inner cell mass of human blastocysts that were produced through in vitro fertilization procedures. The techniques for growing human embryonic stem cells as described earlier, are similar to those used for culture of mouse embryonic stem cells. However, human embryonic stem...