Results 231 to 240 of about 173,935 (289)

Monosubstituted N‐Arylhydroxylamine Chemistry: Integrating Contemporary Synthetic Approaches for the Efficient Construction of Diverse Heterocyclic Scaffolds

Chemistry – A European Journal, EarlyView.
Monosubstituted N‐arylhydroxylamines represent a unique subclass of hydroxylamines that act as pivotal intermediates in redox transformations and as versatile platforms for further synthetic transformations. They serve as key building blocks in the synthesis of architecturally complex heterocycles and other valuable organic compounds.
Michael G. Kallitsakis, Kyriakos D. Nikopoulos, Ioannis N. Lykakis   +2 more
wiley   +1 more source

Eccentricity rhythms in the Oligocene-Miocene carbon cycle regulated by weathering and carbonate burial. [PDF]

Sci Adv
Liu F, Huang E, Du J, Ma W, Liu Z, Lourens LJ, Tian J.   +6 more
europepmc   +1 more source

Southern Ocean seabird population shifts over the Holocene revealed by peat sequestration of mercury from guano. [PDF]

Proc Natl Acad Sci U S A
Li C, Roberts SJ, Grosjean M, Mestrot A, Wille M, Phillips RA, Enrico M, Bishop K, Skyllberg U, Mauquoy D, von Scheffer C, Theurer T, Muirhead D, Whittle A, Gallego-Sala A, Sonke JE, De Vleeschouwer F, Van der Putten N, Braconnot P, Marti O, Osterwalder S, Buchmann N, Frölicher T, Anthamatten E, Chiaia-Hernández AC, Zahajská P, Jeandel C, Saunders KM, Kwon SY, Wang D, Bindler R, Sime L, Hodgson DA.   +32 more
europepmc   +1 more source

Water and Nitrogen Use Strategies and Their Influencing Mechanisms in Typical Desert Shrubs of the Qaidam Basin, Qinghai-Tibet Plateau, China. [PDF]

Plants (Basel)
Zhao Y, Chen H.
europepmc   +1 more source

Geochemical Characteristics and Oil-Gas Geological Significance of the Cambrian Bituminous Calcite Veins in the Northeast Margin of Ordos Basin, China. [PDF]

ACS Omega
Chen W, Wang X, Liu W, Zhang D, Luo H, Li X, Yuan X.   +6 more
europepmc   +1 more source

Doubting doubly labeled water. [PDF]

Proc Natl Acad Sci U S A
Uzoigwe CE.
europepmc   +1 more source

Stable isotope labelling mass spectrometry analysis of isolated mouse sperm. [PDF]

Biol Reprod
Dobson G, Balbach M.
europepmc   +1 more source

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Carbon and oxygen isotope microanalysis of carbonate

Rapid Communications in Mass Spectrometry, 2009
Abstract Technical modification of the conventional method for the δ 13 C and δ 18 O analysis of 10–30 µg carbonate samples is described.
Tatiana A, Velivetskaya, Alexander V, Ignatiev, Sergey A, Gorbarenko   +2 more
openaire   +2 more sources

Raman detector of carbon isotopes

Optical Sensing and Detection VI, 2020
We introduce a Raman scattering based detector of carbon isotopes in gaseous mixtures. A solid state 532 nm 5 W CW laser focused into a gaseoussample by a custom-built diffraction-limited objective was used for excitation of Raman signal. Raman signal was collected by an f-matcher with edge filter at excitation wavelength of 532 nm.
Evgeny Popov, Anton Polishchuk, Konstantin Grigorenko, Ian Chubchenko, Vladimir Vitkin   +4 more
openaire   +1 more source

Carbon-isotopic analysis of dissolved acetate

Analytical Chemistry, 1990
Heating of dried, acetate-containing solids together with oxalic acid dihydrate conveniently releases acetic acid for purification by gas chromatography. For determination of the carbon-isotopic composition of total acetate, the acetate-containing zone of the chromatographic effluent can be routed directly to a combustion furnace coupled to a vacuum ...
J T, Gelwicks, J M, Hayes
openaire   +2 more sources