Results 41 to 50 of about 2,618 (222)

Inference on the Nature and the Mass of Earth's Late Veneer from Noble Metals and Gases [PDF]

, 2001
Noble metals and gases are very sensitive to the late accretion to the Earth of asteroids and comets. We present mass balance arguments based on these elements that indicate that 0.7E22-2.7E22 kg of extraterrestrial bodies struck the Earth after core ...
Allègre, Alvarez, Anders, Anderson, Bar-Nun, Bar-Nun, Basaltic Volcanism Study Project, Bernard Marty, Chyba, Chyba, Chyba, Craig, Crisp, Crovisier, Dauphas, Dauphas, Dauphas, Dauphas, Deloule, Delsemme, Engrand, Feldman, Fernandez, Gaffey, Gradie, Grieve, Hildebrand, Hunten, Jagoutz, Jambon, Jessberger, Kawakita, Kerridge, Kimura, Klein, Kleine, Kokubu, Krasnopolsky, Kurat, Kyte, Lipschutz, Love, Maher, Marty, Marty, Marty, Matsuda, Mazor, McDonough, Meisel, Meisel, Michael, Mojzsis, Morbidelli, Moreira, Morgan, Mumma, Newman, Nicolas Dauphas, Owen, Owen, Ozima, Schlesinger, Schoenberg, Schopf, Shoemaker, Shoemaker, Sleep, Stern, Stern, Swindle, Swindle, Tackley, Tolstikhin, Trieloff, Valbracht, Walker, Wasson, Yamamoto, Yin, Zahnle, Zhao   +81 more
core   +2 more sources

Fatty Acid Vesicles as Hard UV-C Shields for Early Life

Foundations, 2023
Theories on life’s origin generally acknowledge the advantage of a semi-permeable vesicle (protocell) for enhancing the chemical reaction–diffusion processes involved in abiogenesis.
Iván Lechuga, Karo Michaelian
doaj   +1 more source

The Theory of Evolution is Not an Explanation for the Origin of Life [PDF]

, 2010
The propagation of misconceptions about the theory of biological evolution must be addressed whenever and wherever they are encountered. The recent article by Paz-y-Mino and Espinoza in this journal contained several such misconceptions, including: that ...
Clough, Michael, Colbert, James, Colbert, James, Kelly, Clint, Rice, Justin, Warner, Daniel   +5 more
core   +3 more sources

On the Evolution of the Biological Framework for Insight

Philosophies, 2021
The details of abiogenesis, to date, remain a matter of debate and constitute a key mystery in science and philosophy. The prevailing scientific hypothesis implies an evolutionary process of increasing complexity on Earth starting from (self ...
Claudio Neidhöfer
doaj   +1 more source

Protection of liposomes by ferric salts against the UV damage and its implications for the origin of life

Frontiers in Astronomy and Space Sciences
Previously, we presented a hypothesis on the Darwinian evolution of liposomes that relies only on natural and ever-present phenomena: solar UV radiation, day/night cycle, gravity, and the formation/release of amphiphiles in aqueous media.
Ben Turner, Kevin Wu, Gennady Fiksel, Vladimir Subbotin, Vladimir Subbotin   +4 more
doaj   +1 more source

The Evolution of Active Droplets in Chemorobotic Platforms [PDF]

, 2017
There is great interest in oil-in-water droplets as simple systems that display astonishingly complex behaviours. Recently, we reported a chemorobotic platform capable of autonomously exploring and evolving the behaviours these droplets can exhibit.
Cronin, Lee, Grizou, Jonathan, Parrilla Gutierrez, Juan Manuel, Points, Laurie J., Taylor, James Ward   +4 more
core   +1 more source

The Impact of Salts on Single Chain Amphiphile Membranes and Implications for the Location of the Origin of Life

Life, 2017
One of the key steps in the origins of life was the formation of a membrane to separate protocells from their environment. These membranes are proposed to have been formed out of single chain amphiphiles, which are less stable than the dialkyl lipids ...
Sarah Maurer
doaj   +1 more source

Origin of Life

, 2012
The evolution of life has been a big enigma despite rapid advancements in the fields of biochemistry, astrobiology, and astrophysics in recent years.
A. Gibbons, Ashwini Kumar Lal, C. Bohler, C. Chyba, C. Huber, C.E. Manning, C.J. Salter, D. Penny, D. Warmflash, D.S. Heckman, D.S. Mckay, E.G. Roussel, F. Hoyle, F. Hoyle, F. Hoyle, G.F. Joyce, H.C. Arp, H.C. Urey, J. Li, J. Maddox, J. Postgate, J.B.S. Haldane, J.K. Fredrickson, J.V. Narlikar, J.W. Schopf, K. Kvenvolden, L.-H. Lin, L.E. Orgel, L.J. Richardson, M.T. Mondigan, N.C. Wickramsinghe, P. David, P. Ehrenfreund, P. Senapathy, R. Shapiro, R.D. Lorenz, S Arrhenius, S.J. Mojzsis, S.L. Miller, S.L. Miller, Stofan, T. Brock, T.D. Brack, W. Gilbert, W. Martin, Y.-J. Kuan, Y.-J. Ma   +46 more
core   +1 more source

Dependence of Biological Activity on the Surface Water Fraction of Planets

, 2019
One of the unique features associated with the Earth is that the fraction of its surface covered by land is comparable to that spanned by its oceans and other water bodies.
Lingam, Manasvi, Loeb, Abraham
core   +1 more source

Simple Ion–Gas Mixtures as a Source of Key Molecules Relevant to Prebiotic Chemistry

Molecules, 2021
Very simple chemistry can result in the rapid and high-yield production of key prebiotic inorganic molecules. The two reactions investigated here involve such simple systems, (a) carbon disulfide (CS2) and acetate (CH3COO¯) and (b) sulfur dioxide (SO2 ...
Samuel Paula, Liam S. Goulding, Katherine N. Robertson, Jason A. C. Clyburne   +3 more
doaj   +1 more source