Results 331 to 340 of about 7,461,069 (375)

Evolution was Chemically Constrained

Journal of Theoretical Biology, 2003
The objective of this paper is to present a systems view of the major features of biological evolution based upon changes in internal chemistry and uses of cellular space, both of which it will be stated were dependent on the changing chemical environment.
R. J. P. Williams, J.J.R.Fraústo da Silva   +1 more
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The chemical evolution

Early Years Educator, 2008
Thankfully, the vast majority of parents want the very best for their children. However, many will be unaware of the hidden dangers that many baby care products carry for even the youngest babies.
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Chemical evolution of photosynthesis

Origins of Life, 1976
The principles of biological evolution of photosynthesis are established, but the ways of chemical evolution are unclear yet. The model systems will help to elucidate the problem. Every type of photosynthesis requires photoreceptor absorbing solar radiation. We studied as photoreceptors inorganic components of Earth crust, some coenzymes and porphyrins
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Chemical evolution and the evolution of the Earth's crust

Origins of Life, 1977
It is hypothesized that there is a close relationship between the geologic evolution of the global plates of the Earth's crust and the chemical evolution of life on the Earth. Characteristics of the axes of plate spreading are discussed in relation to postulated environments conductive to the synthesis of chemical compounds thought to be important ...
M. J. Dowler, D. E. Ingmanson
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Life in the light: nucleic acid photoproperties as a legacy of chemical evolution.

Physical Chemistry, Chemical Physics - PCCP, 2016
Photophysical investigations of the canonical nucleobases that make up DNA and RNA during the past 15 years have revealed that excited states formed by the absorption of UV radiation decay with subpicosecond lifetimes (i.e.,
Ashley A. Beckstead, Yuyuan Zhang, M. de Vries, B. Kohler   +3 more
semanticscholar   +1 more source

Chemical Evolution of the Galaxy

Annual Review of Astronomy and Astrophysics, 1991
Since the discovery of the cosmic microwave background ( 1 84), it is gen­ erally assumed that the universe originated from a hot big bang (78). Detailed nucleosynthesis calculations based on the hot big bang model (e.g. 4, 1 82, 221 ) showed that no element heavier than 9Be could have been synthesized primordially with an abundance exceeding 101 4 by ...
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Iron(II) molybdate (FeMoO4) nanorods as a high-performance anode for lithium ion batteries: structural and chemical evolution upon cycling

, 2015
FeMoO4 nanorods were synthesized by a one-step solvothermal method and demonstrated to have attractive performance as an anode material in lithium ion batteries (LIBs).
Zhenyu Zhang, Wenyue Li, T. Ng, Wenpei Kang, Chun‐Sing Lee, Wenjun Zhang   +5 more
semanticscholar   +1 more source

Structural and Chemical Evolution of Li- and Mn-Rich Layered Cathode Material

, 2015
Lithium (Li)- and manganese-rich (LMR) layered-structure materials are very promising cathodes for high energy density lithium-ion batteries. However, the voltage fading mechanism in these materials as well as its relationships to fundamental structural ...
Jianming Zheng, P. Xu, M. Gu, Jie Xiao, N. Browning, P. Yan, Chongmin Wang, Ji‐Guang Zhang   +7 more
semanticscholar   +1 more source

Pathways of Chemical Evolution of Photosynthesis

Origins of Life, 1974
The primary metabolism of protobionts was probably based on the electron transfer reactions regulated by catalysts or photosensitizing pigments. The action of photoreceptive pigments was inevitable in the case of electron transfer leading to light energy storage in the reaction products.
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The role of phosphorus in chemical evolution

Chemical Society Reviews, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
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