Catálogo de publicaciones - revistas

<jats:p> A <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/feature/data/books/brl5983.dtl">listing of books received</jats:ext-link> at <jats:italic>Science</jats:italic> during the week ended 28 May 2010. </jats:p>

<jats:p> Kitcher's essay review examines eight books that explore causes and consequences of the debates over climate change. (Plus: <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://tiny.cc/clichng">online discussion</jats:ext-link> ) </jats:p>

<jats:p>The current system of port state control lacks transparency, accountability, and the global reach to punish fishers who are illegally emptying our oceans.</jats:p>

<jats:p>Genetic paternity testing and field observations of crickets challenge conventional wisdom about sex differences and fitness.</jats:p>

<jats:p>A haze of fractal particles may account for the warm temperatures that led to the wet conditions of the early Earth.</jats:p>

<jats:p>Quantum field effects are magnified by collective interactions between many atoms.</jats:p>

<jats:p>Can national emissions inventories be verified through direct atmospheric measurements?</jats:p>

<jats:p>Phylogenetic analysis reveals mutations that led to the rise of drug resistance in seasonal H1N1 influenza.</jats:p>

<jats:p>Unanchored chains of ubiquitin molecules control a cell signaling pathway that responds to viral infection.</jats:p>

<jats:title>Quantum Spin Liquid</jats:title> <jats:p> In antiferromagnets, the lowest-energy state is reached when neighboring spins on the underlying lattice point in opposite directions. Because of geometric constraints on some lattices (such as the two-dimensional triangular lattice), this magnetic ordering cannot be achieved even at temperatures close to absolute zero, and these compounds are predicted to be in a quantum spin liquid state. <jats:bold> Yamashita <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1246" related-article-type="in-this-issue" vol="328" xlink:href="10.1126/science.1188200">1246</jats:related-article> ) measured the thermal conductivity of a recently identified candidate quantum spin liquid, the organic compound EtMe <jats:sub>3</jats:sub> Sb[Pd(dmit) <jats:sub>2</jats:sub> ] <jats:sub>2</jats:sub> , and characterized its lowest-lying excitations. Two types of excitations were observed: ballistically propagating gapless excitations and excitations associated with a finite spin gap. These results contribute to our understanding of this unusual state of matter, which is potentially relevant to other two-dimensional quantum systems. </jats:p>