生命科学进化带来的思考
作者:丛斌(全国人大宪法和法律委员会副主任委员、中国工程院院士)生命科学的发展进程与自然界生物物种进化过程类似,都是由简单到复杂,由单一到多样,由低级到高级。因此,可以把生命科学的发展进程类比为生命科学进化。
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Abstract:Of more than a thousand known cataclysmic variables , where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf, and it is expected that these objects will transition to helium accretion. These transitional CVs have been proposed as progenitors of helium CVs. However, no known transitional CV is expected to reach an orbital period short enough to account for most of the helium CV population, leaving the role of this evolutionary pathway unclear. Here we report observations of ZTF J1813+4251, a 51-minute-orbital-period, fully eclipsing binary system consisting of a star with a temperature comparable to that of the Sun but a density 100 times greater owing to its helium-rich composition, accreting onto a white dwarf. Phase-resolved spectra, multi-band light curves and the broadband spectral energy distribution allow us to obtain precise and robust constraints on the masses, radii and temperatures of both components. Evolutionary modelling shows that ZTF J1813+4251 is destined to become a helium CV binary, reaching an orbital period under 20 minutes, rendering ZTF J1813+4251 a previously missing link between helium CV binaries and hydrogen-rich CVs.
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生命科学进化带来的思考
原标题:生命科学进化带来的思考生命科学的发展进程与自然界生物物种进化过程类似,都是由简单到复杂,由单一到多样,由低级到高级。因此,可以把生命科学的发展进程类比为生命科学进化。
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Reform and opening up has been crucial in making China what it is today, and will remain crucial to achieving the Two Centenary Goals and the rejuvenation of the Chinese nation. As vital today as it ever was, reform and opening up, along with the development of our practice and the freeing of minds, are processes without end;