منابع مشابه
Human Migrations: The Two Roads Taken
America was peopled from Asia by at least the end of the last ice age, but the exact timing of entry and the composition of the source population are unclear. A new analysis of two rare mitochondrial haplogroups suggests two separate Asian migrations into the Americas, indicating simultaneous but independent Asian source populations for early American colonists.
متن کاملThe roads not taken
endangered, the highest level of threat. But one of the real problems facing the IUCN is a lack of data. More than half the 44 cetacean species are considered “data deficient”, meaning future research on population numbers is a priority. And the worry is that more data could show more species in trouble. The blue whale, fin whale and sei whale all remain listed as endangered until more evidence...
متن کاملFatty acid transport: the roads taken.
Efficient uptake and channeling of long-chain fatty acids (LCFAs) are critical cellular functions. Although spontaneous flip-flop of nonionized LCFAs from one leaflet of a bilayer to the other is rapid, evidence is emerging that proteins are important mediators and/or regulators of trafficking of LCFAs into and within cells. Genetic screens have led to the identification of proteins that are re...
متن کاملCorpora at Linguateca: Vision and roads taken
In the late nineties, access to Portuguese data in electronic form was scarce, and was considered one of the bottlenecks limiting the advance of natural language processing of Portuguese (Santos, 1999a), so Linguateca’s launching of AC/DC i had as purpose to significantly increase the amount of data – and its quality, in that the data was annotated and classified. To the best of my knowledge, A...
متن کاملHematopoietic (stem) cell development — how divergent are the roads taken?
The development of the hematopoietic system during early embryonic stages occurs in spatially and temporally distinct waves. Hematopoietic stem cells (HSC), the most potent and self-renewing cells of this system, are produced in the final 'definitive' wave of hematopoietic cell generation. In contrast to HSCs in the adult, which differentiate via intermediate progenitor populations to produce f...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2009
ISSN: 0960-9822
DOI: 10.1016/j.cub.2009.01.021