搜索结果: 1-14 共查到“知识库 天体生物学”相关记录14条 . 查询时间(4.844 秒)
科研人员揭示从小分子生成多环芳香烃（PAHs）的形成机理（图）
小分子 多环芳香烃 形成机理
2023/1/13
星际复杂有机分子，尤其是生命相关分子（如糖和氨基酸），可能最终被运送到早期地球，从而逐渐演化为生命（图1）。因此，对星际复杂有机分子形成机理的研究，是解开宇宙生命起源之谜的核心课题。近年来，随着国内外射电天文望远镜灵敏度的大幅提高，星际空间中越来越多的复杂有机分子被探测到，包括多环芳香烃（PAHs）。然而，观测到的PAHs在星际空间中如何起源，长久以来都没有定论。
探索火星环境演化和生命信号一直是火星探测的重要科学目标。“天问一号”首次火星探测任务迈出了我国行星探测征程的第一步，未来我国还将实施“天问三号”火星采样返回任务。火星生命探测研究中“探哪里”、“探什么”、“如何探”是当前天体生物学研究的重大课题和挑战。“探哪里”主要指火星生命探测和采样返回任务的着陆区和采样区的确定；“探什么”主要是目标生命信号的遴选；“如何探”则涉及生命信号准确探测和解译所需的分...
探索地外宜居环境和生命信号是天体生物学研究的核心科学问题，也是深空探测的重要科学目标。地球上的一些极端环境是公认开展天体生物学研究的理想实验区域。海平面之上20~100公里高度的地球临近空间具有高辐射、低气压、低温、干燥等极端环境条件，可以在一定程度上类比现代火星的表面环境。探究生命在临近空间的生存和适应机制不仅可以更好地认识地球生命的生存极限，而且有助于理解地外生命可能的生存策略、生命星际传输、...
The Effects of Refractive Index Mismatch on Multiphoton Fluorescence Excitation Microscopy of Biological Tissue
scattering spherical aberration refractive index mismatch two-photon microscopy multiphoton fluorescence excitation microscopy
2015/5/21
Introduction: Multiphoton fluorescence excitation microscopy (MPM) is an invaluable tool for studying processes in tissue in live animals by enabling biologists to view tissues up to hundreds of micro...
Defending The Fallacy of Fine-Tuning
Defending Fallacy Fine-Tuning Cosmology and Extragalactic Astrophysics
2012/2/21
In 2011, I published a popular-level book, The Fallacy of Fine-Tuning: Why the Universe is Not Designed for Us. It investigated a common claim found in contemporary religious literature that the param...
Integrated Filterbank for DESHIMA: A Submillimeter Imaging Spectrograph Based on Superconducting Resonators
Kinetic Inductance Detector SubmillimeterWave Spectrometer
2011/10/10
An integrated filterbank (IFB) in combination with microwave kinetic inductance detectors (MKIDs), both based on superconducting resonators, could be used to make broadband submillimeter imaging spect...
Physical mechanisms that shape the morphologies of extragalactic jets
morphologies extragalactic jets
2009/7/9
Physical mechanisms that shape the morphologies of extragalactic jets。
BVRI surface photometry of mixed morphology pairs of galaxies. III. The third data set
BVRI surface photometry The third data set morphology pairs of galaxies
2009/6/25
BVRI surface photometry of mixed morphology pairs of galaxies. III. The third data set。
The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies
Line Excitation Mapping Investigate Planetary Nebula Morphologies
2009/6/18
The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies。
IS THE “STAR TREK”CONCEPT OF ALIENS REALLY NAIVE? -- A COMMENT ON DURIC AND FIELD
Astrobiology-Extraterrestrial intelligence-Radio lines general-Galaxy stellar content
2009/3/6
Several assumptions used in the recent review paper on the search
for extraterrestrial intelligence (SETI) by Duric and Field (2003) are critically dis-
cussed. New astrobiological results|in partic...
One of the most interesting problems in the nascent discipline
of astrobiology is more than half-century old Fermi's paradox: why, considering
extraordinary young age of Earth and the Solar System i...
ON THE TIMESCALE FORCING IN ASTROBIOLOGY
Astrobiology-Methods numerical-Galaxy evolution-Extraterres-trial intelligence
2009/2/11
We investigate the e®ects of correlated global regulation mecha-
nisms, especially Galactic gamma-ray bursts (GRBs), on the temporal distribution
of hypothetical inhabited planets, using simple ...
EVIDENCE OF MOLECULAR ADAPTATION TO EXTREME ENVIRONMENTS AND APPLICABILITY TO SPACE ENVIRONMENTS
Astrobiology
2009/2/9
This is initial investigation of gene signatures responsible for adapt-
ing microscopic life to the extreme Earth environments. We present preliminary
results on identi¯cation of the clusters o...
NEOCATASTROPHISM AND THE MILKY WAY ASTROBIOLOGICAL LANDSCAPE
Astrobiology-methods numerical-Galaxy evolution-extraterres-trial intelligence
2009/2/9
The number and distribution of habitable planets in the Milky
Way is one of the foremost problems of contemporary astrobiological research. We
investigate the e®ects of applying general neocatas...