Results 31 to 40 of about 1,189,605 (351)

The effect of mixing and consistency on cellulose cationization

open access: yesHeliyon, 2019
Traditional chemical modifications of cellulose are usually done at low or medium consistencies. Processing at high solids content is expected to provide a leap forward in reduction of manufacturing costs such as minimization of chemical use, energy ...
Pia Willberg-Keyriläinen   +4 more
doaj   +1 more source

Infinite-body optimal transport with Coulomb Cost [PDF]

open access: yes, 2013
We introduce and analyze symmetric infinite-body optimal transport (OT) problems with cost function of pair potential form. We show that for a natural class of such costs, the optimizer is given by the independent product measure all of whose factors are
Cotar, Codina   +2 more
core   +3 more sources

Natural Products Chemistry [PDF]

open access: yesNature, 1964
The Chemistry of Natural Products Special and Introductory Lectures presented at the Second International Symposium on the Chemistry of Natural Products held in Prague, August 27–September 2, 1962. (International Union of Pure and Applied Chemistry, Section of Organic Chemistry, in conjunction with the Czechoslovak Academy of Science and the ...
openaire   +1 more source

The crystal structure of a matrine derivative: 41S,7aS,12S,13aR,13bR)-12-(4-methylpiperazin-1-yl)dodecahydro-1H,5H,10H-dipyrido[2,1-f:3′,2′,1′-ij][1,6]naphthyridin-10-one, C20H34N4O

open access: yesZeitschrift für Kristallographie - New Crystal Structures, 2018
C20H34N4O, triclinic, P1 (no. 1), a = 7.8545(6) Å, b = 10.8802(9) Å, c = 12.3714(9) Å, α = 73.200(7)°, β = 75.372(6)°, γ = 71.091(7)°, V = 942.65(13) Å3, Z = 2, Rgt(F) = 0.0591, wRref(F2) = 0.1641, T = 293(2) K.
Cheng Xing-An   +5 more
doaj   +1 more source

Comprehensive Characterization of Secondary Metabolites in Fruits and Leaves of Cloudberry (Rubus chamaemorus L.)

open access: yesMetabolites, 2023
Cloudberry (Rubus chamaemorus L.) is a circumpolar boreal plant rich in bioactive compounds and is widely used in food and in folk medicine. In this study, a combination of two-dimensional NMR spectroscopy and liquid chromatography–high-resolution mass ...
Anna V. Faleva   +4 more
doaj   +1 more source

Natural Product

open access: yesDefinitions, 2020
Amaryllidaceae alkaloids (AAs) are a unique class of specialized metabolites containing heterocyclic nitrogen bridging that play a distinct role in higher plants.
T. Jayawardena   +4 more
semanticscholar   +1 more source

Phenolic profiling and therapeutic potential of local flora of Azad Kashmir; In vitro enzyme inhibition and antioxidant

open access: yesOpen Chemistry, 2017
The current study supports the phytochemical screening, evaluation of antioxidant and enzyme inhibition potential and correlations between antioxidant activities and phenolics of Rumex dentatus (Family: Polygonaceae), Mentha spicata (Family: Lamiaceae ...
Raza Muhammad Asam   +5 more
doaj   +1 more source

The crystal structure of a matrine derivative, 13-(methylamine-1-yl) carbodithioate matrine, C17H27N3OS2

open access: yesZeitschrift für Kristallographie - New Crystal Structures, 2020
C17H27N3OS2, monoclinic, P21 (no. 4), a = 8.8052(10) Å, b = 10.8860(10) Å, c = 18.6705(2) Å, β = 99.2730(10)°, V = 1766.24(3) Å3, Z = 4, Rgt(F) = 0.0298, wRref(F2) = 0.0802, T = 100.00(10) K.
Hui-Qing He   +8 more
doaj   +1 more source

Comprehensive Characterization of Chemical Composition and Antioxidant Activity of Lignan-Rich Coniferous Knotwood Extractives

open access: yesAntioxidants, 2022
A knotwood of coniferous trees containing large amounts of polyphenolic extractives is considered a promising industrial-scale source of lignans possessing antioxidant properties and other bioactivities.
Nikolay V. Ul’yanovskii   +4 more
doaj   +1 more source

Non-natural Olefin Cyclopropanation Catalyzed by Diverse Cytochrome P450s and Other Hemoproteins [PDF]

open access: yes, 2014
Recent work has shown that engineered variants of cytochrome P450_(BM3) (CYP102A1) efficiently catalyze non-natural reactions, including carbene and nitrene transfer reactions.
Arnold, Frances H.   +4 more
core   +1 more source

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