scholarly journals The early evolution of the fish with pelagic eggs resources in the upstream of Danjiangkou Reservoir after the cascade development

2018 ◽  
Vol 30 (5) ◽  
pp. 1319-1331 ◽  
Author(s):  
LEI Huan ◽  
◽  
XIE Wenxing ◽  
HUANG Daoming ◽  
XIE Shan ◽  
...  
Keyword(s):  
Early Evolution ◽  
Danjiangkou Reservoir ◽  
Pelagic Eggs

Comprehensive Assessment of Danjiangkou Reservoir Ecosystem Health

2012 ◽  
Vol 18 (1) ◽  
pp. 86
Author(s):  
Hongye ZHANG ◽  
Qinghua CAI ◽  
Linghui KONG ◽  
Yaoyang XU ◽  
Min ZHANG ◽  
...  
Keyword(s):  
Ecosystem Health ◽  
Comprehensive Assessment ◽  
Danjiangkou Reservoir

scholarly journals Cofactors are Remnants of Life’s Origin and Early Evolution

2021 ◽  
Vol 89 (3) ◽  
pp. 127-133 ◽  
Author(s):  
Aaron D. Goldman ◽  
Betul Kacar
Keyword(s):  
Genetic Information ◽  
Evolutionary Biology ◽  
Active Sites ◽  
Rna World ◽  
Genetic System ◽  
Early Evolution ◽  
Modern Biology ◽  
Iron Sulfur Cluster ◽  
Adenosyl Methionine ◽  
Precursor Rna

AbstractThe RNA World is one of the most widely accepted hypotheses explaining the origin of the genetic system used by all organisms today. It proposes that the tripartite system of DNA, RNA, and proteins was preceded by one consisting solely of RNA, which both stored genetic information and performed the molecular functions encoded by that genetic information. Current research into a potential RNA World revolves around the catalytic properties of RNA-based enzymes, or ribozymes. Well before the discovery of ribozymes, Harold White proposed that evidence for a precursor RNA world could be found within modern proteins in the form of coenzymes, the majority of which contain nucleobases or nucleoside moieties, such as Coenzyme A and S-adenosyl methionine, or are themselves nucleotides, such as ATP and NADH (a dinucleotide). These coenzymes, White suggested, had been the catalytic active sites of ancient ribozymes, which transitioned to their current forms after the surrounding ribozyme scaffolds had been replaced by protein apoenzymes during the evolution of translation. Since its proposal four decades ago, this groundbreaking hypothesis has garnered support from several different research disciplines and motivated similar hypotheses about other classes of cofactors, most notably iron-sulfur cluster cofactors as remnants of the geochemical setting of the origin of life. Evidence from prebiotic geochemistry, ribozyme biochemistry, and evolutionary biology, increasingly supports these hypotheses. Certain coenzymes and cofactors may bridge modern biology with the past and can thus provide insights into the elusive and poorly-recorded period of the origin and early evolution of life.

scholarly journals Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 188
Author(s):  
Marco Berton ◽  
Emilia Järvelä
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Plasma Jets ◽  
Early Evolution ◽  
Host Galaxy ◽  
Bolometric Luminosity ◽  
Radio Imaging ◽  
Strong Relation ◽  
Evolution Stage ◽  
Good Proxy

It is well known that active galactic nuclei (AGN) show various forms of interaction with their host galaxy, in a number of phenomena generally called AGN feedback. In particular, the relativistic plasma jets launched by a fraction of AGN can strongly affect their environment. We present here a study of the [O III] λλ4959,5007 lines in a diverse sample of early evolution stage AGN–specifically narrow-line Seyfert 1 galaxies. Radio imaging observations of all of the sources enable a division to jetted and non-jetted sources, and exploiting this we show that the ionized gas properties are significantly influenced by the presence of the jets, as we often find the [O III] lines (blue-)shifted with respect to their restframe wavelength. We also show how the radio morphology and the radio spectral index do not seem to play a role in the origin of the [O III] shifts, thus suggesting that the source inclination is not relevant to the lines displacement. We do not find a strong relation between the [O III] line properties and the bolometric luminosity, suggesting that within our sample radiatively driven outflows do not seem to have a significant contribution to the [O III] line kinematics. We finally suggest that [O III] shifts may be a good proxy to identify the presence of relativistic jets. Additional studies, especially with integral-field spectroscopy, will provide a deeper insight into the relation between jets and their environment in early evolution stage AGN.

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