Results 21 to 30 of about 144,921 (302)

Editorial on the Special Issue: “Advances in Xerogels: From Design to Applications”

open access: yesGels, 2023
Xerogels are solid materials derived from gels which consist of interconnected particles or polymers dispersed in a liquid [...]
Andrea Fiorati   +2 more
doaj   +1 more source

Investigation of J-Aggregates of 2,3,7,8,12,13,17,18-Octabromo-5,10,15,20-tetrakis(4-sulfonatophenyl) Porphyrin in Aqueous Solutions

open access: yesNanomaterials, 2023
The highly distorted water-soluble 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (Br8TPPS44−) is readily protonated under acidic pH, forming the diacid H2Br8TPPS42− and subsequently the zwitterionic H4Br8TPPS4, which ...
Balkis Abdelaziz   +7 more
doaj   +1 more source

Analysis of Organic Sulphur Compounds in Coal Tar by Using Comprehensive Two-Dimensional Gas Chromatography-High Resolution Time-of-Flight Mass Spectrometry

open access: yesSeparations, 2020
Coal tar is a complex mixture of organic compounds obtained from the thermal treatment of coal; it contains several different chemical classes of compounds, such as polycyclic aromatic hydrocarbons, phenols and different heterocyclic compounds including ...
Ivan Aloisi   +3 more
doaj   +1 more source

Cry "Good for history, Cambridge and Saint George"? Essay Review of Mary Jo Nye (Ed.); The Cambridge History of Science, Vol. 5. The Modern Physical and Mathematical Sciences, (Cambridge: Cambridge University Press, 2003) [PDF]

open access: yes, 2004
FIRST PARAGRAPH This volume is the third thus far published of The Cambridge history of science, planned in eight parts over the last decade by Cambridge University Press.
Gooday, G.
core   +1 more source

Chance, necessity and the origins of life: a physical sciences perspective

open access: yesPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2017
Earth's 4.5-billion-year history has witnessed a complex sequence of high-probability chemical and physical processes, as well as ‘frozen accidents’.
R. Hazen
semanticscholar   +1 more source

How does the Earth system generate and maintain thermodynamic disequilibrium and what does it imply for the future of the planet? [PDF]

open access: yesPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2011
The Earth's chemical composition far from chemical equilibrium is unique in our Solar System, and this uniqueness has been attributed to the presence of widespread life on the planet.
A. Kleidon
semanticscholar   +1 more source

When crust comes of age: on the chemical evolution of Archaean, felsic continental crust by crustal drip tectonics

open access: yesPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2018
The secular evolution of the Earth's crust is marked by a profound change in average crustal chemistry between 3.2 and 2.5 Ga. A key marker for this change is the transition from Archaean sodic granitoid intrusions of the tonalite–trondhjemite ...
O. Nebel   +6 more
semanticscholar   +1 more source

A Computational Quantum-Based Perspective on the Molecular Origins of Life’s Building Blocks

open access: yesEntropy, 2022
The search for the chemical origins of life represents a long-standing and continuously debated enigma. Despite its exceptional complexity, in the last decades the field has experienced a revival, also owing to the exponential growth of the computing ...
Gabriele Amante   +4 more
doaj   +1 more source

Incidence of Phage Capsid Organization on the Resistance to High Energy Proton Beams

open access: yesApplied Sciences, 2022
The helical geometry of virus capsid allows simple self-assembly of identical protein subunits with a low request of free energy and a similar spiral path to virus nucleic acid.
Laura Maria De Plano   +11 more
doaj   +1 more source

Do interdisciplinary research teams deliver higher gains to science? [PDF]

open access: yes, 2017
The present paper takes its place in the stream of studies that analyze the effect of interdisciplinarity on the impact of research output. Unlike previous studies, in this study the interdisciplinarity of the publications is not inferred through their ...
Abramo, Giovanni   +2 more
core   +1 more source

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