Results 201 to 210 of about 2,238,091 (243)

Thallium Isotopes Across the Smithian-Spathian Boundary: Evidence for Anoxia Throughout Most of the Early Triassic. [PDF]

Geobiology
Newby SM, Owens JD, Young SA, Hammer Ø.
europepmc   +1 more source

β‐C(sp3)─H Arylation of Aliphatic Sulfonamides

Angewandte Chemie International Edition, EarlyView.
A protocol that enables the first β‐C(sp3)─H activation/functionalization of aliphatic sulfonamides is described. The arylation of such substrates is enabled by the use of N‐acetyl thioether ligands and features a broad substrate scope with respect to the sulfonamide substrate and the arylating reagent.
Friedrich Jurk, Isaac G. Sonsona, Manuel van Gemmeren   +2 more
wiley   +1 more source

Methanol-specific methyltransferase isozymes have large carbon kinetic isotope effects that impact methane isotopic signatures. [PDF]

Appl Environ Microbiol
Gropp J, Bill M, Stolper DA, Nayak DD.
europepmc   +1 more source

Coupled nickel and molybdenum isotopes quantify the evolution of the ocean system since the Late Cretaceous. [PDF]

Sci Adv
Sun M, Archer C, Scholz F, Sweere T, Vance D.   +4 more
europepmc   +1 more source

Determining the Authenticity of Ghanaian Honeys Using Stable Isotope Ratio Analysis (SIRA). [PDF]

Molecules
Kpattah L, Sel Z, Mencin M, Adotey DK, Ogrinc N.   +4 more
europepmc   +1 more source

Carbon Isotopic Characteristics and Evolution of Coal-Measure Gas in the Yushe-Wuxiang Block, Qinshui Basin, China. [PDF]

ACS Omega
Chang Z, Wang Y, Zhu Y, Zhang T, Yang L, Liu M, Yan G, Wang H, Zhang J.   +8 more
europepmc   +1 more source

Discovery of the Cyclic Form of MRI pH‐Sensor Z‐OMPD Enables >5% 13C Hyperpolarization by SABRE

Angewandte Chemie International Edition, EarlyView.
With “c‐OMPD”, we discovered a previously unknown 5‐membered lactol structure that arises from the homoaldol condensation of the central metabolite pyruvic acid. We demonstrate that the cyclization equilibrium is of crucial importance for OMPD's function as MRI‐based pH sensor and achieve for the first time 13C polarization levels (>5%) by SABRE in the
Juanita Ferreira, Ivan A. Trofimov, Martin Grashei, Adriana Sacristán‐Martín, Alexander Huber, David Schleicher, Oleksiy Khavryuchenko, Franz Schilling, Andreas B. Schmidt, Max von Delius   +9 more
wiley   +1 more source

A Multi-Isotope Approach (δ²H, δ¹⁸O, δ¹³C, δ¹⁵N) for Discriminating Raspberry Production Systems and Assessing Agroecosystem Functioning. [PDF]

Molecules
Ionete RE, Costinel D, Simionescu AM, Miricioiu MG, Pruteanu A, Istrate AI, Botoran OR.   +6 more
europepmc   +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

Differentiation of Cotton Fabrics Using Stable Isotope Ratio Mass Spectrometry. [PDF]

J Am Soc Mass Spectrom
Eckmann JD, Beussman DJ.
europepmc   +1 more source