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Genetics
Achievement |
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Earliest Homo Sapiens Fossils Discovered in Ethiopia
Scientists from the University of California at Berkeley
along with researchers from Ethiopia and several other
countries have uncovered fossils of the earliest modern human,
Homo sapiens, estimated at 154,000 to 160,000 years old.
According to the scientists, the findings provide strong evidence that
Homo sapiens and Neanderthals co-existed, rather than the former
descending from the latter. In two articles appearing in the June 12 edition
of the journal Nature, the authors describe the fossilized crania of
two adults and a child uncovered at the Herto village in the Middle Awash study
area of Ethiopia, about 140 miles northeast of its capital, Addis Ababa. The
fossils fill a major gap in the human fossil record, the scientists report.
More... (posted
June 11, 2003)
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Going with the Grain: A Tale of Rice’s Smallest Chromosome
Behold a grain of rice. Inside are thousands of cells; within each
cell are 12 chromosomes; and on rice’s smallest chromosome, No.
10, are about 3,500 genes and more than 22 million base pairs, the
links in the chain of DNA. So, what’s the big deal about rice’s
smallest chromosome? There are several, according to a report in
the June 6 issue of the journal Science. Upon close examination,
chromosome 10 has about twice as many genes as were predicted when
an international consortium announced draft genome sequence in the
same journal last December. An organism’s genome consists of the
entire genetic code held in its DNA. Of potentially greater significance,
a detailed look at chromosome 10 shows that the genome map of rice
is similar to other grains, particularly sorghum and maize.
More... (posted
June 6, 2003)
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New Results Force Scientists to Rethink Single-Molecule Wires
Single-molecule switches have the potential to shrink computing
circuits dramatically, but new results from the Arizona State University
lab that first described how to wire a single molecule between gold
contacts now show that laboratory-standard wired molecules have
an unavoidable tendency to "blink" randomly. In the May 30, 2003,
Science, Stuart Lindsay and colleagues identify the cause
of this blinking behavior as random, temporary breaks in the chemical
bond between the wired molecule and the gold contacts, making this
particular wired-molecule arrangement unsuitable for electronic
circuits. The National Science Foundation supported the research.
More... (posted June 6, 2003)
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Draft FY2003-2008 GPRA Strategic Plan Available
The National Science Foundation solicits your
comments on its draft strategic plan. The Government Performance and
Results Act of 1993 – what we call GPRA - requires all federal agencies
to update their strategic plans every three years. NSF submitted its current
strategic plan for FY 2001- 2006 in October 2000. Therefore we will submit an
updated strategic plan to the Administration and the Congress by September 2003.
(posted June 9, 2003)
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NSB Seeks Comments on Draft Report on National Workforce
Policies for Science and Engineering
(posted
June 6, 2003)
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