Results 51 to 60 of about 361,547 (333)

Osteohistology of the Scapulocoracoid of Confuciusornis and Preliminary Analysis of the Shoulder Joint in Aves

open access: yesFrontiers in Earth Science, 2021
As key components of the tetrapod pectoral girdle, the scapula and coracoid have played a significant role in the evolution of forelimb locomotion among terrestrial vertebrates.
Qian Wu   +11 more
doaj   +1 more source

The Origins of Life: The Managed-Metabolism Hypothesis [PDF]

open access: yesFoundations of Science, 2017
The ‘managed-metabolism’ hypothesis suggests that a ‘cooperation barrier’ must be overcome if self-producing chemical organizations are to undergo the transition from non-life to life.
J. Stewart
semanticscholar   +1 more source

The Origins of Life on Earth A Retrospective on Ideas [PDF]

open access: yes, 1994
Recent ideas about the origins of life are becoming less parochial. It is no longer taken for granted that the original forms were caricatures of the simpler existing organisms and that the problem, in essence, is to devise means by which proteins, and ...
Pirie, N. W.
core   +1 more source

Life as a Guide to its Own Origins

open access: yesAnnual Review of Ecology, Evolution and Systematics, 2023
The origin of life entails a continuum from simple prebiotic chemistry to cells with genes and molecular machines. Using life as a guide to this continuum, we consider how selection could promote increased complexity before the emergence of genes ...
S. Harrison   +5 more
semanticscholar   +1 more source

Chirality and the Origin of Life [PDF]

open access: yesSymmetry, 2021
The origin of life, based on the homochirality of biomolecules, is a persistent mystery. Did life begin by using both forms of chirality, and then one of the forms disappeared? Or did the choice of homochirality precede the formation of biomolecules that could ensure replication and information transfer?
openaire   +1 more source

Environmental Adaptation from the Origin of Life to the Last Universal Common Ancestor [PDF]

open access: yes, 2017
Extensive fundamental molecular and biological evolution took place between the prebiotic origins of life and the state of the Last Universal Common Ancestor (LUCA).
Cantine, Marjorie Dianne   +3 more
core   +1 more source

Spatial Information in the Emergence of Life

open access: yesFrontiers in Genetics, 2021
Information in living systems is part of a complex relationship between the internal organization and functionality of life. In a cell, both genetic-coding sequences and molecular-shape recognition are sources of biological information.
Hugo I. Cruz-Rosas, Pedro Miramontes
doaj   +1 more source

Question 1: Origin of Life and the Living State [PDF]

open access: yes, 2007
Question 1: Origin of Life and the Living ...
Stuart Kauffman
core   +1 more source

New Yuomys rodents from southeastern Qinghai-Tibet Plateau indicate low elevation during the Middle Eocene

open access: yesFrontiers in Earth Science, 2023
Yuomys are medium-sized Hystricomorpha rodents. They are known for coming from areas of low elevation in China during the middle and late Eocene. Two new Yuomys were discovered from a locality near Xueshuo village in Litang County, Sichuan Province.
Xijun Ni   +18 more
doaj   +1 more source

Lithostratigraphy of a long, fossiliferous Oligocene sequence: Revisiting Saint Jacques, Nei Mongol, China

open access: yesFrontiers in Earth Science, 2023
For a hundred years the Saint Jacques area has been known to produce rich Oligocene vertebrate fossils, yet only a handful of previous studies have focused on this area.
Bian Wang   +31 more
doaj   +1 more source

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