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排序方式: 共有273条查询结果,搜索用时 31 毫秒
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Summary Red blood cell nuclei from avian anaemic blood have been fractionated by rate sedimentation on discontinous sucrose gradients into fractions which can be distinguished both by their RNA synthesizing ability and by their morphology as revealed by electron microscopy.Acknowledgment. We wish to thank H. Gitay for the electron micrographs. This work was supported by grants from the University of Cape Town Research Committee and the Council for Scientific and Industrial Research. 相似文献
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J. E. Bauer N. Gerber R. K. Lynn R. G. Smith R. M. Thompson 《Cellular and molecular life sciences : CMLS》1976,32(8):1032-1033
Summary An N-glucuronide metabolite of carbamazepine was identified in the bile of the isolated perfused rat liver by means of permethylation, gas chromatography and mass spectrometry.This research was supported by grants from the National Institutes of Health (Nos. N01-NS-5-2328, AM-17665) and the James Whitcomb Riley Memorial Association (No. 74-15) and a grant from the Epilepsy, Foundation of America. 相似文献
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Aynajian P da Silva Neto EH Gyenis A Baumbach RE Thompson JD Fisk Z Bauer ED Yazdani A 《Nature》2012,486(7402):201-206
In solids containing elements with f orbitals, the interaction between f-electron spins and those of itinerant electrons leads to the development of low-energy fermionic excitations with a heavy effective mass. These excitations are fundamental to the appearance of unconventional superconductivity and non-Fermi-liquid behaviour observed in actinide- and lanthanide-based compounds. Here we use spectroscopic mapping with the scanning tunnelling microscope to detect the emergence of heavy excitations with lowering of temperature in a prototypical family of cerium-based heavy-fermion compounds. We demonstrate the sensitivity of the tunnelling process to the composite nature of these heavy quasiparticles, which arises from quantum entanglement of itinerant conduction and f electrons. Scattering and interference of the composite quasiparticles is used to resolve their energy-momentum structure and to extract their mass enhancement, which develops with decreasing temperature. The lifetime of the emergent heavy quasiparticles reveals signatures of enhanced scattering and their spectral lineshape shows evidence of energy-temperature scaling. These findings demonstrate that proximity to a quantum critical point results in critical damping of the emergent heavy excitation of our Kondo lattice system. 相似文献
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Pietrzyński G Thompson IB Gieren W Graczyk D Bono G Udalski A Soszyński I Minniti D Pilecki B 《Nature》2010,468(7323):542-544
Stellar pulsation theory provides a means of determining the masses of pulsating classical Cepheid supergiants-it is the pulsation that causes their luminosity to vary. Such pulsational masses are found to be smaller than the masses derived from stellar evolution theory: this is the Cepheid mass discrepancy problem, for which a solution is missing. An independent, accurate dynamical mass determination for a classical Cepheid variable star (as opposed to type-II Cepheids, low-mass stars with a very different evolutionary history) in a binary system is needed in order to determine which is correct. The accuracy of previous efforts to establish a dynamical Cepheid mass from Galactic single-lined non-eclipsing binaries was typically about 15-30% (refs 6, 7), which is not good enough to resolve the mass discrepancy problem. In spite of many observational efforts, no firm detection of a classical Cepheid in an eclipsing double-lined binary has hitherto been reported. Here we report the discovery of a classical Cepheid in a well detached, double-lined eclipsing binary in the Large Magellanic Cloud. We determine the mass to a precision of 1% and show that it agrees with its pulsation mass, providing strong evidence that pulsation theory correctly and precisely predicts the masses of classical Cepheids. 相似文献
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Ninglian Wang Tandong Yao Dahe Qin L. G. Thompson E. Mosley-Thompson J. Cole-Dai M. E. Davis P. -N. Lin 《科学通报(英文版)》1999,44(17):1616-1616
A36Cl peak was found in the predicted section of Guliya ice core, from the Qinghai-Tibetan Plateau, at about 37 kaBP. This cannot
be interpreted by means of changes in the accumulation rate, but by the enhanced cosmogenic isotope production rate in the
atmosphere. Compared with the records of10Be and36Cl in the other regions, the peaks of the cosmogenic isotopes are global and can be considered as time marks. An intriguing
fact is that the peaks coincided with cold periods. 相似文献