搜索结果: 1-15 共查到“理学 trace”相关记录230条 . 查询时间(0.029 秒)
Scientists last autumn revealed that the gas phosphine was found in trace amounts in Venus’ upper atmosphere. That discovery promised the slim possibility that phosphine serves as a biological signatu...
Researchers trace evolution of the domesticated tomato（图）
Researchers trace evolution domesticated tomato
2020/1/19
In a new paper, a team of evolutionary biologists and geneticists led by Ana Caicedo and Hamid Razifard of the University of Massachusetts Amherst report that they have identified missing li...
Zircon U-Pb age, Trace Element, and Hf Isotopic Compositions of Nordmarkite in the Lizhuang Rare Earth Element Deposit in the Western Margin of the Yangtze Block
nordmarkite REE deposit Hf isotopic characteristics of zircon Lizhuang
2018/4/10
The Mianning–Dechang (MD) rare earth element (REE) belt, located in the northern Kangdian axis (KDA) in the western margin of the Yangtze platform, is one of the most economically significant REE mine...
【目的】果蝇是完全变态昆虫，蛹期经历了幼虫组织解离和成虫组织重塑的过程。本研究旨在利用细胞谱系追踪方法G-TRACE（Gal4 technique for real-time and clonal expression）这一新的遗传学技术，检测果蝇幼虫后肠肠细胞在蛹期发育过程中是否发生细胞迁移。【方法】采用黑腹果蝇Drosophila melanogaster engrailed-Gal4（en-...
Inverted,but not perfectly:First trace of differences between matter and “ordinary” antimatter
Inverted but not perfectly First trace differences between matter ordinary antimatter
2017/3/14
In data collected during the first phase of operation of the Large Hadron Collider the LHCb collaboration team has discovered an interesting asymmetry. The most recent analysis of decays of the beauty...
Simultaneous determination of 58 major and trace elements in volcanic glass shards from the INTAV sample mount using femtosecond laser ablation-inductively coupled plasma-mass spectrometry
volcanic glass tephra LA-ICP-MS element abundance femtosecond lasert
2017/4/10
Four volcanic glass samples on the INternational focus group on Tephrochronology And Volcanism (INTAV) sample
mount described by Kuehn et al. (2011) were analyzed to establish a new methodology for m...
Major and trace element compositions and resource potential of ferromanganese crust at Takuyo Daigo Seamount, northwestern Pacific Ocean
Fe-Mn crust Takuyo Daigo Seamount northwestern Pacific Ocean resource potential evaluation
2017/4/10
We report major element and trace element compositions of ferromanganese crusts (Fe-Mn crusts) on Takuyo Daigo
Seamount, northwestern Pacific Ocean. Highly enriched elements in these crusts, such as ...
Trace coordinates on Fricke spaces of some simple hyperbolic surfaces
simple hyperbolic surfaces Fricke spaces
2015/9/29
The work of Fricke-Klein [20] develops the deformation theory of hyperbolic
structures on a surface Σ in terms of the space of representations of its fundamental group damental group π = π1(Σ) in SL(...
Trace elements mobility in soils from the hydrothermal area of Nisyros (Greece)
volatile elements fumarolic gases volcanoes
2015/8/18
Nisyros Island, Greece, is a stratovolcano known for its intense hydrothermal activity. On June 2013, during a multidisciplinary field campaign, soil samples were collected in the caldera area to dete...
Trace Element Estimation – Methods & Clinical Context
Atomic Absorption Spectrophotometer ICP-MS Stripping Voltameter Colorimetry Electro Thermal Vaporization Neutron Activation Analysis Laser Microprobe Mass Analysis
2015/8/5
Understanding the effects of trace metals on human health is as complex as it is fascinating. As mentioned earlier, the high concentrations may prove toxic, as also, depletion in the concentration of ...
GEOTRACES—A Global Study of the Marine Biogeochemical Cycles of Trace Elements and Their Isotopes
Marine Biogeochemical Cycles Trace Elements Their Isotopes
2015/7/28
Since the late 1990s there has been a growing impetus for a comprehensive global study of the marine biogeochemical cycles of trace elements and their isotopes (TEIs). This has led to the development ...
Bioactive trace Metal distributions and Biogeochemical controls in the Southern ocean
Metal distributions Biogeochemical controls
2015/7/15
Extensive sampling in many regions of the Southern Ocean has
demonstrated that surface water concentrations of dissolved Fe are low enough
to limit phytoplankton growth. In contrast, there is curr...
CHOW’S K/k-IMAGE AND K/k-TRACE, AND THE LANG–NERON THEOREM
THE LANG–NERON THEOREM K/k-TRACE
2015/7/6
Let K/k be an extension of fields, and assume that it is primary: the algebraic closure of k in K is
purely inseparable over k. The most interesting case in practice is when K/k is a regular ex...
Trace formula for the Sturm-Liouville eigenvalue problem with its applications to n-body problem
Sturm-Liouville eigenvalue applications n-body problem
2015/3/18
Trace formula for the Sturm-Liouville eigenvalue problem with its applications to n-body problem.
A new WRF-Chem treatment for studying regional-scale impacts of cloud processes on aerosol and trace gases in parameterized cumuli
regional-scale impacts new WRF-Chem treatment
2015/3/5
A new treatment of cloud effects on aerosol and
trace gases within parameterized shallow and deep convection, and aerosol effects on cloud droplet number, has been
implemented in the Weather Researc...