作者：Nimmo, Francis; Kleine, Thorsten; Morbidelli, Alessandro
作者单位：University of California System; University of California Santa Cruz; Max Planck Society; Universite PSL; College de France; Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; Universite Cote d'Azur; Observatoire de la Cote d'Azur; Centre National de la Recherche Scientifique (CNRS)
摘要：The last giant impact on Earth is thought to have formed the Moon1. The timing of this event can be determined by dating the different rocks assumed to have crystallized from the lunar magma ocean (LMO). This has led to a wide range of estimates for the age of the Moon between 4.35 and 4.51 billion years ago (Ga), depending on whether ages for lunar whole-rock samples2, 3-4 or individual zircon grains5, 6-7 are used. Here we argue that the frequent occurrence of approximately 4.35-Ga ages amon...
作者：Landrum, Laura L.; Duvivier, Alice. K.
作者单位：National Center Atmospheric Research (NCAR) - USA
作者：McCormack, Clare; Thomason, Moriah
作者单位：New York University
作者：Fenk, Lorenz A.; Riquelme, Juan Luis; Laurent, Gilles
作者单位：Max Planck Society
摘要：The mechanisms underlying the mammalian ultradian sleep rhythm-the alternation of rapid-eye-movement (REM) and slow-wave (SW) states-are not well understood but probably depend, at least in part, on circuits in the brainstem1-6. Here, we use perturbation experiments to probe this ultradian rhythm in sleeping lizards (Pogona vitticeps)7-9 and test the hypothesis that it originates in a central pattern generator10,11-circuits that are typically susceptible to phase-dependent reset and entrainmen...
