Results 31 to 40 of about 144,211 (333)

Thermal Study on Adducts of Urea with n-Alkanes and n-l-Alkanols [PDF]

open access: yes, 1971
Crystalline adducts of urea with n-alkanes (C(8)~C(20)) and n-l-alkanols (C(12)~C(18)) were prepared. From thermal analysis and X-ray diffraction study on the adducts, we found that the composition of adducts and the heat of decomposition can be obtained
Monobe, Kazuo   +2 more
core   +1 more source

Transient and intermediate carbocations in ruthenium tetroxide oxidation of saturated rings

open access: yesBeilstein Journal of Organic Chemistry, 2019
The ruthenium tetroxide-mediated oxidation of cyclopentane, tetrahydrofuran, tetrahydrothiophene and N-substituted pyrrolidines has been studied computationally by DFT and topological (analysis of the electron localization function, ELF) methods.
Manuel Pedrón   +5 more
doaj   +1 more source

Changes in aliphatic hydrocarbon tracer composition during the digestive process of the marine worm Nereis virens. Preliminary results [PDF]

open access: yes, 1998
In the laboratory, marine worms were fed with a mixture of algae and several aliphatic hydrocarbons for 15 days. By comparing hydrocarbons in food and in faeces, it appeared that the worm's digestive process led to changes in the distribution of the n ...
Atlas   +18 more
core   +4 more sources

Electrochemical detection of simple alkanes by utilizing a solid-state zirconia-based gas sensor

open access: yesChimica Techno Acta, 2023
Solid-state gas sensors composed of complex oxide electrolytes offer great potential for analyzing various atmospheres at high temperatures. While relatively simple gas mixtures (H2O+N2, O2+N2) have been successfully studied by means of ZrO2-based ...
Anatoly S. Kalyakin, Alexander N. Volkov
doaj   +1 more source

Experimental and modeling study of the low-temperature oxidation of large alkanes [PDF]

open access: yes, 2008
This paper presents an experimental and modeling study of the oxidation of large linear akanes (from C10) representative from diesel fuel from low to intermediate temperature (550-1100 K) including the negative temperature coefficient (NTC) zone.
Battin-Leclerc, Frédérique   +4 more
core   +3 more sources

Pig Slurry Fertilization Changes the Pyrolytic Signature of Humic Substances in Calcareous Soil

open access: yesAgronomy
The aim of this study was to determine the effect of progressive pig slurry (PS) rates, applied over a 12-year period, on the molecular composition of soil organic matter in a calcareous soil.
Àngela D. Bosch-Serra   +3 more
doaj   +1 more source

GC-MS metabolic profiling and free radical scavenging activity of Micromeria dalmatica

open access: yesBiologica Nyssana, 2016
Metabolite profile of acetone exudate and methanolic extract from aerial parts of Micromeria dalmatica Benth were analyzed by GC/MS. Palmitic and linolenic acids, hentriacontane, amyrin, quercetagetin 3,6,7-trimethyl ether, sucrose were identified ...
Nikolova, M., Aneva, I., Berkov, S.
doaj   +1 more source

Changes in Morphology, Metabolism and Composition of Cuticular Wax in Zucchini Fruit During Postharvest Cold Storage

open access: yesFrontiers in Plant Science, 2021
Cuticle composition is an important economic trait in agriculture, as it is the first protective barrier of the plant against environmental conditions. The main goal of this work was to study the role of the cuticular wax in maintaining the postharvest ...
Fátima Carvajal   +5 more
doaj   +1 more source

H4-Alkanes: A new class of hydrogen storage material?

open access: yes, 2017
The methane-based material (H$_2$)$_4$CH$_4$, also called H4M for short, is in essence a methane molecule with 4 physisorbed H$_2$ molecules. While H4M has exceptionally high hydrogen storage densities when it forms a molecular solid, unfortunately, this
Harrison, D.   +2 more
core   +1 more source

Factors affecting the extent of branching in fischertropsch synthesis products with iron-based catalysts [PDF]

open access: yes, 1989
Branched products are mainly formed during secondary isomerization reactions, and not in the main synthesis reaction itself. The extent of branching is a function of the catalyst formulation. High acidity and a low hydrogenation strength of the catalyst (
Snel, R.
core   +2 more sources

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