Catálogo de publicaciones - revistas

<jats:title>The perception of complex scents</jats:title> <jats:p> It is generally assumed that olfactory receptors faithfully report information to the brain in the form of a linear, additive code. However, under realistic conditions, the olfactory system handles a far more complex input, usually mixtures of odors. Xu <jats:italic>et al.</jats:italic> found that when we smell scents, the nasal olfactory sensory neurons relay a more complex pattern of signals to the brain than previously thought. The responses of individual neurons within the peripheral olfactory epithelium were either amplified or attenuated by the presence of other odors, which could explain the common perception of one odor in a mixture dominating over others. This effect occurs within the peripheral sensory organ's receptors and not within the brain. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aaz5390">eaaz5390</jats:related-article> </jats:p>

<jats:p> Davis <jats:italic>et al</jats:italic> . (Research Articles, 30 August 2019, p. 891) report human occupation at Cooper’s Ferry, Idaho, USA, ~16,000 years ago, well before Greenland Interstadial 1 (GI-1). Critical review suggests that this early date is not supported by the evidence. Human occupation might have begun in the mid-16th millennium before the present, but would have been more likely after ~15,000 years ago, coeval with GI-1. </jats:p>

<jats:p>Manning builds an inappropriate Bayesian age model to assert that the initial occupation at Cooper’s Ferry began only ~15,935 ± 75 to 15,130 ± 20 cal yr B.P., suggesting that our estimation of ~16,560 to 15,280 cal yr B.P. is unsupported. However, this analysis both ignores evidence of human occupation from the earliest undated cultural deposits and reflects a misapplication of Bayesian age-modeling techniques. Consequently, his results are unreliable.</jats:p>

<jats:p>Last week, the United Nations declared the coronavirus disease 2019 (COVID-19) pandemic to be the greatest test the world has faced since World War II. Every day brings news of more infections and deaths, together with rising economic hardship as businesses close and jobs are lost. A global health crisis is now triggering a global economic crisis. On 26 March, the G20 nations, representing the world's 20 largest economies, declared their intention to unite in response to the emergency. What should be their next steps?</jats:p>

<jats:p>It's a common trope that Arab women lack equality of opportunity and freedom to engage with the world. The received wisdom is that they are prevented from pursuing an education and a career by religious and/or cultural restrictions. But the truth is more nuanced. Religion and culture are not the strongest determinants of Arab nations' approaches to women's education—systems and resources are. Choosing to see religion or ethnicity over economics and prosperity is both careless and damaging.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>Polio, measles, other diseases set to surge as COVID-19 forces suspension of campaigns.</jats:p>

<jats:p>Infrastructure and tactics developed for existing epidemics could aid the coronavirus fight.</jats:p>

<jats:p>A raft of trials will test whether chloroquine and other treatments can protect health workers from COVID-19.</jats:p>

<jats:p>But some experts are skeptical that small respiratory particles transmit infectious virus.</jats:p>