Results 41 to 50 of about 11,846 (190)

Discovery and validation of an NMR-based metabolomic profile in urine as TB biomarker

open access: yesScientific Reports, 2020
Despite efforts to improve tuberculosis (TB) detection, limitations in access, quality and timeliness of diagnostic services in low- and middle-income countries are challenging for current TB diagnostics.
José Luis Izquierdo-Garcia   +21 more
doaj   +1 more source

Untargeted metabolomics in doping control : detection of new markers of testosterone misuse by ultrahigh performance liquid chromatography coupled to high-resolution mass spectrometry [PDF]

open access: yes, 2015
The use of untargeted metabolomics for the discovery of markers is a promising and virtually unexplored tool in the doping control field. Hybrid quadrupole time-of-flight (QTOF) and hybrid quadrupole Orbitrap (Q Exactive) mass spectrometers, coupled to ...
Deventer, Koen   +18 more
core   +2 more sources

Composition analysis of natural gas by combined benchtop NMR spectroscopy and mechanistical multivariate regression

open access: yesEnergy Reports, 2022
Natural gas is an essential energy source for a large variety of applications in today’s society. Forecasts predict that it will also play a vital role in decarbonizing the energy sector.
Anton Duchowny   +9 more
doaj   +1 more source

Cost effective power amplifiers for pulsed NMR sensors [PDF]

open access: yes, 2015
Sensors that measure magnetic resonance relaxation times are increasingly finding applications in areas such as food and drink authenticity and waste water treatment control.
Hughes-Riley, T, Morris, RH, Newton, MI
core   +1 more source

Hyperpolarized 129Xe for benchtop NMR: Inline instrumentation for automated yet flexible operation yielding high polarization

open access: yesJournal of Magnetic Resonance Open
The use of hyperpolarized media in combination with benchtop NMR spectrometers is currently extensively investigated to enable cost effective but highly sensitive applications.
Wolfgang Kilian   +3 more
doaj   +1 more source

A One-Hole Cu\u3csub\u3e4\u3c/sub\u3eS Cluster with N\u3csub\u3e2\u3c/sub\u3eO Reductase Activity: A Structural and Functional Model for Cu\u3csub\u3eZ\u3c/sub\u3e [PDF]

open access: yes, 2016
During bacterial denitrification, two-electron reduction of N2O occurs at a [Cu4(μ4-S)] catalytic site (CuZ*) embedded within the nitrous oxide reductase (N2OR) enzyme.
Antholine, William E.   +4 more
core   +2 more sources

Iridium-Catalyzed Silylation of Five-Membered Heteroarenes: High Sterically Derived Selectivity from a Pyridyl-Imidazoline Ligand. [PDF]

open access: yes, 2020
The steric effects of substituents on five-membered rings are less pronounced than those on six-membered rings because of the difference in bond angles. Thus, the regioselectivities of reactions of five-membered heteroarenes that occur with selectivities
Hartwig, John F   +3 more
core   +1 more source

Reaction Monitoring Using SABRE-Hyperpolarized Benchtop (1 T) NMR Spectroscopy [PDF]

open access: yesAnalytical Chemistry, 2019
The conversion of [IrCl(COD)(IMes)] (COD = cis, cis-1,5-cyclooctadiene, IMes = 1,3-bis(2,4,6-trimethyl-phenyl)imidazole-2-ylidene) in the presence of an excess of para-hydrogen ( p-H2) and a substrate (4-aminopyridine (4-AP) or 4-methylpyridine (4-MP)) into [Ir(H)2(IMes)(substrate)3]Cl is monitored by 1H NMR spectroscopy using a benchtop (1 T ...
Semenova, Olga   +5 more
openaire   +6 more sources

A fully integrated paperfluidic molecular diagnostic chip for the extraction, amplification, and detection of nucleic acids from clinical samples [PDF]

open access: yes, 2016
Paper diagnostics have successfully been employed to detect the presence of antigens or small molecules in clinical samples through immunoassays; however, the detection of many disease targets relies on the much higher sensitivity and specificity ...
Dewar, Rajan   +4 more
core   +2 more sources

Benchtop (60 MHz) proton NMR spectroscopy for quantification of 16-O-methylcafestol in lipophilic extracts of ground roast coffee

open access: yesMethodsX, 2023
We present a method for analysing the lipophilic fraction extracted from ground coffee beans using 60 MHz proton (1H) NMR spectroscopy. In addition to the triglycerides from coffee oil, spectral features are seen from a range of secondary metabolites ...
Y. Gunning, M. Defernez, E.K. Kemsley
doaj   +1 more source

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