Results 41 to 50 of about 5,372 (258)

Ecological Clues to the Nature of Consciousness

Entropy, 2020
Some dynamics associated with consciousness are shared by other complex macroscopic living systems. For example, autocatalysis, an active agency in ecosystems, imparts to them a centripetality, the ability to attract resources that identifies the system ...
Robert E. Ulanowicz
doaj   +1 more source

Ascorbic acid and copper in linoleate oxidation. II. Ascorbic acid and copper as oxidation catalysts

Journal of Lipid Research, 1969
Both ascorbic acid and copper were strong prooxidants in the oxidation of linoleate in a buffered (pH 7.0) aqueous dispersion at 37°C. Minimum concentrations at which catalytic activity was detected were 1.3 × 10-7m for copper and 1.8 × 10-6m for ...
Gottfried Haase, W.L. Dunkley
doaj   +1 more source

Multiple-peak traveling waves of the Gray-Scott model

Mathematics in Applied Sciences and Engineering, 2023
We study a reaction-diffusion system which models the pre-mixed isothermal autocatalytic chemical reaction of order m  (m > 1) between two chemical species, a reactant A and an auto-catalyst B,   A + m B  --> (m+1) B, and a linear decay B -->C, where  C ...
Xinfu Chen, Xin Lai, Cong Qin, Yuanwei Qi, Yajing Zhang   +4 more
doaj   +1 more source

Small-molecule autocatalysis drives compartment growth, competition and reproduction

, 2023
International audienceSustained autocatalysis coupled to compartment growth and division is a key step in the origin of life, but an experimental demonstration of this phenomenon in an artificial system has previously proven elusive.
Blokhuis, Alex, Fabien Ferrage, Loire, Estelle, Alex Blokhuis, Philippe Nghe, Andrea Franconi, Jullien, Ludovic, Abrishamkar, Afshin, Rebecca Turk-MacLeod, Estelle Loire, Gabrielle Woronoff, Philippe Pelupessy, Turk-Macleod, Rebecca, Jeancolas, Cyrille, Jayaprakash Karuppusamy, Griffiths, Andrew, Heng Lu, Ferrage, Fabien, Franconi, Andrea, Szathmary, Eörs, Eörs Szathmary, Afshin Abrishamkar, Karuppusamy, Jayaprakash, Cyrille Jeancolas, Woronoff, Gabrielle, Pelupessy, Philippe, Nghe, Philippe, Ludovic Jullien, Andrew D. Griffiths, Lu, Heng   +29 more
core   +1 more source

Catalysts, autocatalysis and the origin of metabolism [PDF]

Interface Focus, 2019
If life on Earth started out in geochemical environments like hydrothermal vents, then it started out from gasses like CO 2 , N 2 and H 2 . Anaerobic autotrophs still live from these gasses today, and they still inhabit the Earth's crust.
Martina Preiner, Joana C. Xavier, Andrey do Nascimento Vieira, Karl Kleinermanns, John F. Allen, William F. Martin   +5 more
openaire   +4 more sources

Autocatalysis-Driven Clock Reaction III: Clarifying the Kinetics and Mechanism of the Thiourea Dioxide–Iodate Reaction in an Acidic Medium

, 2019
The thiourea dioxide–iodate reaction has been reinvestigated spectrophotometrically under acidic conditions using phosphoric acid–dihydrogen phosphate buffer within the pH range of 1.1–1.8 at 1.0 M ionic strength adjusted by sodium perchlorate and at 25 °
Qingyu Gao (1446913), György Csekö (2064679), Attila K. Horváth (1720879), Li Xu (108702)   +3 more
core   +1 more source

Prebiotic Reaction Networks in Water

Life, 2020
A prevailing strategy in origins of life studies is to explore how chemistry constrained by hypothetical prebiotic conditions could have led to molecules and system level processes proposed to be important for life’s beginnings. This strategy has yielded
Quoc Phuong Tran, Zachary R. Adam, Albert C. Fahrenbach   +2 more
doaj   +1 more source

Primary Anion−π Catalysis and Autocatalysis

, 2018
Epoxide-opening ether cyclizations are shown to occur on π-acidic aromatic surfaces without the need of additional activating groups and with autocatalytic amplification.
Naomi Sakai (633379), Xiaoyu Hao, Javier López-Andarias, Stefan Matile (633380), Le Liu (167133), Anh-Tuan Pham, Hao, Xiaoyu, Pham, Anh Tuan, Naomi Sakai, Xiaoyu Hao (1519699), Frontera, Antonio, Lopez Andarias, Javier, Javier López-Andarias (1685671), Zhang, Xiang, Liu, Le, Xiang Zhang (19800), Antonio Frontera, Stefan Matile, Antonio Frontera (1599388), Matile, Stefan, Anh-Tuan Pham (6083741), Xiang Zhang, Sakai, Naomi, Le Liu, Liu L, Hao X, López-Andarias J, Frontera A, Sakai N, Matile S, Zhang X, Pham AT   +31 more
core   +1 more source

Accelerated Materials Discovery Through In Situ X‐ray Diffraction: Solvothermal Formation of PdxMy (M═Si, Ge, Sn, Pb) Intermetallic Nanoparticles

Advanced Materials, EarlyView.
In situ PXRD data on solvothermal reactions accelerate materials discovery while simultaneously providing fundamental insights into complex crystal formation processes. Using PdxMy (M = Si, Ge, Sn, Pb) as an example, a general formation mechanism is identified, and specific synthesis strategies for ex situ preparation of SnPd2, Sn13Pd20, and SnPd ...
Anders Bæk Borup, Bo Brummerstedt Iversen   +1 more
wiley   +1 more source

Hydraulicity in Organic Polymers Enabled by Hydrophobization Upon Water‐Triggered Curing of Hydrophilic Chains

Angewandte Chemie, EarlyView.
Cement‐mimetic hydraulicity is realized in an organic polymer through a counterintuitive reaction in which a hydrophilic linear polymer reacts with water to undergo hydrophobization during curing via silatrane sol–gel chemistry. This polarity‐inverting curing process turns a water‐plasticized putty into a water‐tolerant rigid material, enabling ...
Rei Tokumitsu, Shio Uebo, Akira Takahashi, Hideyuki Otsuka   +3 more
wiley   +2 more sources