Results 11 to 20 of about 140,320 (253)

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

The Evolution of Homochirality [PDF]

open access: yes, 2010
It is possible to reconsider the origin of biological homochirality in a novel way by formally invoking the standard groupoid approach to stereochemistry in a thermodynamic context that generalizes Landau's spontaneous symmetry breaking arguments ...
Rodrick Wallace
core   +2 more sources

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

‘Data’ in the Royal Society's Philosophical Transactions, 1665–1886 [PDF]

open access: yes, 2019
Was there a concept of data before the so-called ‘data revolution’? This paper contributes to the history of the concept of data by investigating uses of the term ‘data’ in texts of the Royal Society's Philosophical Transactions for the period 1665–1886.
Meyns, Chris
core   +2 more sources

A green and sustainable method for Capsicum volatilome investigation by means of headspace solid-phase microextraction combined with flow-modulated two-dimensional gas chromatography-mass spectrometry using hydrogen as carrier gas

open access: yesGreen Analytical Chemistry, 2023
The present research is focused on the development of a green and sustainable analytical method, based on the use of headspace solid-phase microextraction (HS SPME), and hydrogen as carrier gas, within the context of fast flow-modulation comprehensive ...
Micaela Galletta   +4 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

Pore Structure and Water Transfer in Pietra d’Aspra Limestone: A Neutronographic Study

open access: yesApplied Sciences, 2020
Neutron radiography (NR) was here applied to study the effects of two different commercially available consolidants on the water absorption properties in a particular type of limestone (biocalcarenite), known as Pietra d’Aspra stone, which is one of the ...
Luciana Randazzo   +9 more
doaj   +1 more source

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