Results 61 to 70 of about 11,831 (256)

Deprotective Alkylation: A Platform for Alcohol‐to‐Amine Interconversion Using Nonafluoromesitylenesulfonamides

Angewandte Chemie International Edition, EarlyView.
The straightforward conversion of alcohols to tertiary or secondary amines employing Nms‐amides in a single operation is described. The transformation features broad functional group tolerance and high stereospecificity, underscoring its utility in the synthesis of isotope‐labeled pharmaceuticals.
Jakub Brześkiewicz, Kunj Kapur, Boris Maryasin, Nuno Maulide   +3 more
wiley   +1 more source

Marine clay maturation induces systematic silicon isotope decrease in authigenic clays and pore fluids

Communications Earth & Environment
Marine silicate alteration exerts a major influence on marine carbon and cation cycles, but has proven difficult to quantify. In this context, silicon isotopes of marine pore fluids became an important tracer.
Sonja Geilert, Daniel A. Frick, April N. Abbott, Stefan C. Löhr   +3 more
doaj   +1 more source

Interfacial Mn‐Carbon Nitride Synergy Enables Selective Photocatalytic C─H Chlorination via Single‐Atom Catalysis

Angewandte Chemie International Edition, EarlyView.
A manganese single‐atom photocatalyst on functionalised carbon nitride enables selective visible‐light‐driven C(sp2)─H chlorination. DFT‐supported mechanistic studies indicate that photoinduced charge separation activates NCS, while isolated Mn sites stabilize Mn─Cl intermediates at the catalyst interface.
Jaro Vanderghinste, Prakash Kumar Sahoo, Xinbang Wu, Thanh Huyen Vuong, Anna Rokicińska, Susanna Monti, Giovanni Barcaro, Alina Skorynina, Aleksander Jaworski, Vivien Michaelis, Jabor Rabeah, Julia Bornhorst, Laura Simonelli, Piotr Kuśtrowski, Adam Slabon, Paul J. Dyson, Shoubhik Das   +16 more
wiley   +1 more source

Impact of exchange-correlation functionals on predictions of phonon hydrodynamics: a study of fluorides, chlorides, and hydrides

Materials Research Express
We employ density functional theory calculations to examine the effect of various exchange-correlation (XC) functionals, including the Perdew–Burke–Ernzerhof generalized gradient approximation (PBE), the modified Perdew–Burke–Ernzerhof generalized ...
Jamal Abou Haibeh, Samuel Huberman
doaj   +1 more source

Environmental impact assessment due to natural radioactivity in the mountain rocks of the Red Sea coast, Egypt

Radiation Protection and Environment, 2017
The mountains' composition, especially the granitic mountains, contains a certain amount of natural radioactivity due to the decay of uranium, thorium, and potassium isotopes.
Soad Saad Fares, Ahmed Hassan Korna, Halemah I Elsaeedy, Badriah Elserhani Alshahrani, Hanan Yakout   +4 more
doaj   +1 more source

Seasonal Fluctuations of Plastochromanol‐8 and α‐Tocopherol Amounts in the Leaves of Cecropia Trees

Journal of the American Oil Chemists' Society, EarlyView.
ABSTRACT Plastochromanol‐8 (PC‐8) is a homologue of γ‐tocotrienol with a longer side chain (eight instead of three isoprene units) and therefore also a representative of the tocochromanol (vitamin E) group. PC‐8 has been determined in various plants and seeds, with Cecropia sp. leaves showing unusually high levels.
Rosalie Ormos, Jörg Rau, Walter Vetter
wiley   +1 more source

Determination of the sodium, aluminium, potassium, manganese, magnesium, bromine, cadmium and chlorine concentration values in the whole blood samples of human cancer using neutron activation analysis facility of the second Egyptian research reactor [PDF]

Ядерна фізика та енергетика, 2010
Neutron activation analysis (NAA) using the Second Egyptian Research Reactor (ETRR-2) has been utilized to analyze whole blood samples. The National Cancer Institute of Egypt provided us with 18 blood samples (11 breast, 2 prostate, 2 colon, 1 ...
N. F. Soliman, A. Sroor, L. S. Ashmawy, N. Walley El-Dine, T. El Mohamed   +4 more
doaj  

Estimation the Radionuclides concentrations, Risk indicators and annual doses in soils of residential and agricultural regions in Kirkuk city

Tikrit Journal of Pure Science, 2020
The aim of the current study is to measure the of the radio nuclides, Risk indicators and annual doses in selected soils samples for the residential and agriculture areas in Kirkuk governorate by using the spectroscopy technique of high-purity germanium
Berivan Mohammad Abdwllah, Sabah Mahmoud Aman Allah   +1 more
doaj   +1 more source

Biochar‐based fertilizers improve nutrient use efficiency in sunflower grown on a subtropical tidal soil

Biofuels, Bioproducts and Biorefining, EarlyView.
Abstract Improving fertilizer use efficiency is essential for reducing environmental pollution, sustaining agricultural production, and maximizing the economic profitability of crop production systems. This study tested the hypothesis that the formulation strategy of biochar‐based fertilizers, rather than nutrient addition alone, is associated with ...
Md. Al‐Amin, Miftahul Jannat Mim, S. M. Mahbubul Alam, Shamim Mia, M. M. Masud, Gopal Saha, Md. Abdul Kader, Keiji Jindo   +7 more
wiley   +1 more source

Isotopic Studies of the Body Potassium Content in Thyrotoxicosis.

Experimental Biology and Medicine, 1953
Summary1. A radioactive isotope of potassium (K42) was used to determine the exchangeable potassium content (Ke) in 13 subjects with untreated thyrotoxicosis. The Ke values were lower in untreated thyrotoxic males than in normal male subjects. It is concluded that the low Ke values could be attributed to a decrease in the total muscle mass of the body,
openaire   +2 more sources