We compute the characteristic parameters of the magneto-dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about an axis of a dipolar magnetic field ...We compute the characteristic parameters of the magneto-dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about an axis of a dipolar magnetic field experiencing decay.After a brief outline of the general theoretical background of the model of a vibration-powered neutron star,we present numerical estimates of basic vibration and radiation characteristics,such as frequency,lifetime and luminosity,and investigate their time dependence on magnetic field decay.The presented analysis suggests that a gradual decrease in frequencies of pulsating high-energy emission detected from a handful of currently monitored AXP/SGR-like X-ray sources can be explained as being produced by the vibration-powered magneto-dipole radiation of quaking magnetars.展开更多
Animals integrate various environmental stimuli within the nervous system to generate proper behavioral responses.However,the underlying neural circuits and molecular mechanisms are largely unknown.The insulinlike sig...Animals integrate various environmental stimuli within the nervous system to generate proper behavioral responses.However,the underlying neural circuits and molecular mechanisms are largely unknown.The insulinlike signaling pathway is known to regulate dauer formation,fat metabolism,and longevity in Caenorhabditis elegans(C.elegans).Here,we show that this highly conserved signaling pathway also functions in the integrative response to an olfactory diacetyl and a gustatory Cu^(2+) stimuli.Worms of wild-type N2 Bristol displayed a strong avoidance to the Cu^(2+) barrier in the migration pathway to the attractive diacetyl.Mutants of daf-2(insulin receptor),daf-18(PTEN lipid phosphatase),pdk-1(phosphoinositide-dependent kinase),akt-1/-2(Akt/PKB kinase)and sgk-1(serum-and glucocorticoidinducible kinase)show severe defects in the elusion from the Cu^(2+) .Mutations in DAF-16,a forkhead-type transcriptional factor,suppress the integrative defects of daf-2 and akt-1/-2 mutants.We further report that neither cGMP nor TGFβpathways,two other dauer formation regulators,likely plays a role in the integrative learning.These results suggest that the insulin-like signaling pathway constitutes an essential component for sensory integration and decision-making behavior plasticity.展开更多
基金supportde by the National Natural Science Foundation of China(Grant Nos.10935001 and 10973002)the National Basic Research Program of China(Grant No.2009CB824800)the John Templeton Foundation
文摘We compute the characteristic parameters of the magneto-dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about an axis of a dipolar magnetic field experiencing decay.After a brief outline of the general theoretical background of the model of a vibration-powered neutron star,we present numerical estimates of basic vibration and radiation characteristics,such as frequency,lifetime and luminosity,and investigate their time dependence on magnetic field decay.The presented analysis suggests that a gradual decrease in frequencies of pulsating high-energy emission detected from a handful of currently monitored AXP/SGR-like X-ray sources can be explained as being produced by the vibration-powered magneto-dipole radiation of quaking magnetars.
基金This work was supported by grants from the National Natural Science Foundation of China(Grant Nos.30770523,30630020 and 30670502).
文摘Animals integrate various environmental stimuli within the nervous system to generate proper behavioral responses.However,the underlying neural circuits and molecular mechanisms are largely unknown.The insulinlike signaling pathway is known to regulate dauer formation,fat metabolism,and longevity in Caenorhabditis elegans(C.elegans).Here,we show that this highly conserved signaling pathway also functions in the integrative response to an olfactory diacetyl and a gustatory Cu^(2+) stimuli.Worms of wild-type N2 Bristol displayed a strong avoidance to the Cu^(2+) barrier in the migration pathway to the attractive diacetyl.Mutants of daf-2(insulin receptor),daf-18(PTEN lipid phosphatase),pdk-1(phosphoinositide-dependent kinase),akt-1/-2(Akt/PKB kinase)and sgk-1(serum-and glucocorticoidinducible kinase)show severe defects in the elusion from the Cu^(2+) .Mutations in DAF-16,a forkhead-type transcriptional factor,suppress the integrative defects of daf-2 and akt-1/-2 mutants.We further report that neither cGMP nor TGFβpathways,two other dauer formation regulators,likely plays a role in the integrative learning.These results suggest that the insulin-like signaling pathway constitutes an essential component for sensory integration and decision-making behavior plasticity.
