Tag: "overturn" at biology news
Stem cells in bone marrow replenish mouse ovaries
...al Cell. This finding provides direct evidence to overturn
a long-held dogma in reproductive biology, that female mice generate egg cells only during fetal development and thus are born with a finite stock of eggs that declines throughout life. The new report significantly extends earlier work from the same ...
Ancient DNA confirms single origin of Malagasy primates
...he possibility that data from additional taxa will overturn
this increasingly robust hypothesis." Yoder said the researchers' results support the close relationship of sloth lemurs (Palaeopropithecus) to living indriids, but Megaladapis does not show a sister-group relationship with the living genus Lepilemu...
Scientists discover stage at which an embryonic cell is fated to become a stem cell
...why this occurs. The findings of the study, which overturn
the long-held belief that cells are the same until the fourth cleavage (division) of the embryo, are reported in today's edition of Nature. After fertilisation, the cells of the embryo at first undergo equal, symmetrical divisions and unequal, asym...
Antarctic icebergs -- Hotspots of ocean life
...e mountains of ice – which can shed huge pieces or overturn
without warning – the scientists began their shipboard sampling mere hundreds of feet from the icebergs and continued out to a distance of some five miles, where the icebergs’ influence was no longer detectable. “Phytoplankton around the icebergs...