The Scientist ~ Volume 23, Number 10, October 2009

Date: 28 April 2011, 07:58

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FEATURES
COVER STORY » Running wheels, mouse huts,
nesting material, gnawing objects-most
facilities nowadays are embracing enrichment
practices for rodents, but, as ALLA KATSNELSON
reports, the consensus for what constitutes
good practice-or even what constitutes enrichment
at all-has remained elusive. Plus, could
this added variability in enrichment practices
between labs be affecting scientific data?
Choosing Sex
What accounts for the remarkable plasticity in
sex determination seen in many animals? In
some species offish, all it takes is a glance to
cause an adult female to change her sex. BLANCHE
CAPEL at Duke University Medical Center proposes
a new model for mammalian sex determination,
based on an antagonistic signaling system .
Evolution, Resisted
Malaria kills around a million people each year,
and mosquitoes have developed resistance to
nearly every chemical thrown at them. ELIE
DOLGIN spoke with researchers who are trying
to circumvent this problem-indefinitely. But
can such a tricky technique work?
And much more...................

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