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| http://dx.doi.org/10.1186/s13045-025-01672-8 | DOI Listing |
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Stable isotopes as a predictor for organic or conventional classification of berries and vegetables.
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Department of Land, Air and Water Resources, University of California-Davis, Davis, California, United States of America.
Organic agriculture is expanding worldwide, driven by expectations of improving food quality and soil health. However, while organic certification by regulatory bodies such as the United States Department of Agriculture and the European Union confirms compliance with organic standards that prohibit synthetic chemical inputs, there is limited oversight to verify that organic practices, such as the use of authentic organic fertilizer sources, are consistently applied at the field level. This study investigated the elemental content of carbon (C) and nitrogen (N) and their stable isotopes (δ13C and δ15N) in seven different crops grown under organic or conventional practices to assess their applicability as a screening tool to verify the authenticity of organic labeled produce.
View Article and Find Full Text PDFNumerically stable resonating Hartree-Fock.
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The simulation of excited states at low computational cost remains an open challenge for electronic structure (ES) methods. While much attention has been given to orthogonal ES methods, relatively little work has been done to develop nonorthogonal ES methods for excited states, particularly those involving nonorthogonal orbital optimization. We present here a numerically stable formulation of the Resonating Hartree-Fock (ResHF) method that uses the matrix adjugate to remove numerical instabilities arising from nearly orthogonal orbitals, and as a result, we demonstrate improvements to ResHF wavefunction optimization.
View Article and Find Full Text PDFA ratiometric electrochemical sensor based on Cu@Ni/MWCNTs for detection of chloramphenicol.
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College of Biological and Chemical Engineering, Qilu Institute of Technology, Jinan, 250200, Shandong Province, PR China.
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View Article and Find Full Text PDFDefining the patient acceptable symptom state (PASS) for PROMIS after Hallux Rigidus correction surgery.
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It is unclear which patient reported outcome metric correlates best with clinical improvement. The patient acceptable symptom state (PASS) incorporates the patient's subjective outcome experience into the outcome measurement. This study aims to establish PASS thresholds using Patient-Reported Outcome Measurement Information System (PROMIS) scores in patients undergoing hallux rigidus (HR) correction.
View Article and Find Full Text PDFInherent loss of parahydrogen-induced polarization for systems with magnetically equivalent nuclei in magnetic field cycling experiments.
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International Tomography Center SB RAS, Novosibirsk, Russian Federation.
In the present work, we elucidate the inherent loss of net magnetization (⟨Iz⟩) in parahydrogen-induced polarization (PHIP) experiments with magnetic field cycling (MFC) for spin systems containing magnetically equivalent protons. The effects are shown for propane and diethyl ether as representative examples of potential hyperpolarized MRI contrast agents, but the findings of this work are equally applicable to other multispin systems in the liquid or gas phase. These results are relevant to both adiabatic longitudinal transport after dissociation engenders net alignment (ALTADENA) experiments (where 1H nuclei are polarized) and MFC protocols used to transfer parahydrogen spin order to a heteronucleus such as 13C.
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