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Готові списки джерел за темами / Spectroscopie-γ prompte

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Добірка наукової літератури з теми "Spectroscopie-γ prompte"

Автор: Grafiati

Опубліковано: 13 квітня 2024

Оновлено: 31 липня 2025

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Статті в журналах з теми "Spectroscopie-γ prompte"

1

Jin, Shengbin, David F. Bruhn, Cynthia T. Childs та ін. "Goondapyrones A–J: Polyketide α and γ Pyrone Anthelmintics from an Australian Soil-Derived Streptomyces sp." Antibiotics 13, № 10 (2024): 989. http://dx.doi.org/10.3390/antibiotics13100989.

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An investigation of ×19 soil samples collected under the auspices of the Australian citizen science initiative, Soils for Science, returned ×559 chemically dereplicated microbial isolates, of which ×54 exhibited noteworthy anthelmintic activity against either the heartworm Dirofilaria immitis microfilaria and/or the gastrointestinal parasite Haemonchus contortus L1–L3 larvae. Chemical (GNPS and UPLC-DAD) and cultivation (MATRIX) profiling prompted a detailed chemical investigation of Streptomyces sp. S4S-00196A10, which yielded new anthelmintic polyketide goondapyrones A–J (1–10), together wit

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2

Nyamba, Isaïe, Charles B. Sombie, Anna Lechanteur, Rasmané Semde, and Brigitte Evrard. "Potential of Native Cyclodextrins and L-Lysine for Enhancing Ellagic Acid Aqueous Solubility." INTERNATIONAL JOURNAL OF DRUG DELIVERY TECHNOLOGY 14, no. 02 (2024): 925–31. http://dx.doi.org/10.25258/ijddt.14.2.48.

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This study aimed to examine the influence of β cyclodextrin (βCD) and γ cyclodextrin (γCD) alone and in combination with L-lysine on ellagic acid (EA) solubility. Indeed, complexation with cyclodextrins can be used to improving the solubility of drugs poorly soluble in water such as EA. EA is a Biopharamceutical Classification System (BCS) IV bioactive polyphenol with numerous therapeutic activities, including antimalarial activities. However, its unfavorable physicochemical properties limit its therapeutic use. Therefore, after a phase solubility study, we successfully prepared EA-βCD and γ C

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3

Torres-Rodriguez, Jorge, Diana E. Bedolla, Francesco D’Amico, et al. "Polyvinylidene Fluoride Aerogels with Tailorable Crystalline Phase Composition." Gels 8, no. 11 (2022): 727. http://dx.doi.org/10.3390/gels8110727.

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In this work, polyvinylidene fluoride (PVDF) aerogels with a tailorable phase composition were prepared by following the crystallization-induced gelation principle. A series of PVDF wet gels (5 to 12 wt.%) were prepared from either PVDF–DMF solutions or a mixture of DMF and ethanol as non-solvent. The effects of the non-solvent concentration on the crystalline composition of the PVDF aerogels were thoroughly investigated. It was found that the nucleating role of ethanol can be adjusted to produce low-density PVDF aerogels, whereas the changes in composition by the addition of small amounts of

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4

Yentekakis, Ioannis V., Philippe Vernoux, Grammatiki Goula, and Angel Caravaca. "Electropositive Promotion by Alkalis or Alkaline Earths of Pt-Group Metals in Emissions Control Catalysis: A Status Report." Catalysts 9, no. 2 (2019): 157. http://dx.doi.org/10.3390/catal9020157.

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Recent studies have shown that the catalytic performance (activity and/or selectivity) of Pt-group metal (PGM) catalysts for the CO and hydrocarbons oxidation as well as for the (CO, HCs or H2)-SCR of NOx or N2O can be remarkably affected through surface-induced promotion by successful application of electropositive promoters, such as alkalis or alkaline earths. Two promotion methodologies were implemented for these studies: the Electrochemical Promotion of Catalysis (EPOC) and the Conventional Catalysts Promotion (CCP). Both methodologies were in general found to achieve similar results. Turn

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5

Kim, Hyo-Seon, Dahae Lee, Young-Hye Seo та ін. "Chemical Constituents from the Roots of Angelica reflexa That Improve Glucose-Stimulated Insulin Secretion by Regulating Pancreatic β-Cell Metabolism". Pharmaceutics 15, № 4 (2023): 1239. http://dx.doi.org/10.3390/pharmaceutics15041239.

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The aim of this study was to discover bioactive constituents of Angelica reflexa that improve glucose-stimulated insulin secretion (GSIS) in pancreatic β-cells. Herein, three new compounds, namely, koseonolin A (1), koseonolin B (2), and isohydroxylomatin (3), along with 28 compounds (4–31) were isolated from the roots of A. reflexa by chromatographic methods. The chemical structures of new compounds (1–3) were elucidated through spectroscopic/spectrometric methods such as NMR and HRESIMS. In particular, the absolute configuration of the new compounds (1 and 3) was performed by electronic circ

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6

Vidadala, Ramasubbarao, and Madhusudana Rao J. "Isolation, characterization and semi-synthesis of natural products dimeric amide alkaloids." Journal of Natural Products and Natural Products Synthesis 1, no. 1 (2021): 1–14. http://dx.doi.org/10.55124/jnns.v1i1.17.

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Isolation, characterization of natural products dimeric amide alkaloids from roots of the Piper chaba Hunter. The synthesis of these products using intermolecular [4+2] cycloaddition reaction has been described. Obtained products were characterized using IR, 1HNMR, 13CNMR and Mass Spectroscopy. Introduction The awesome structural diversity and complexity of natural products inspire many chemists to consider how nature creates these molecules. Nature’s biosynthetic enzymes offer a powerful and practical route to many organic compounds, and synthetic chemists sometimes seek to imitate the effici

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7

Yu, Hanzhi, Mengyu Hu, Chong Chen та ін. "Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H2 Evolution at Industrial‐Level Current Density". Angewandte Chemie, 9 листопада 2023. http://dx.doi.org/10.1002/ange.202314569.

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Developing novel synthesis technologies is crucial to expanding bifunctional electrocatalysts for energy‐saving hydrogen production. Herein, we report an ambient and controllable γ‐ray radiation reduction to synthesize a series of noble metal nanoparticles anchored on defect‐rich manganese oxides (M@MnO2‐x, M = Ru, Pt, Pd, Ir) for glycerol‐assisted H2 evolution. Benefiting from the strong penetrability of γ‐rays, nanoparticles and defect supports are formed simultaneously and bridged by metal‐oxygen bonds, guaranteeing structural stability and active site exposure. The special Ru‐O‐Mn bonds ac

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8

Yu, Hanzhi, Mengyu Hu, Chong Chen та ін. "Ambient γ‐Rays‐Mediated Noble‐Metal Deposition on Defect‐Rich Manganese Oxide for Glycerol‐Assisted H2 Evolution at Industrial‐Level Current Density". Angewandte Chemie International Edition, 9 листопада 2023. http://dx.doi.org/10.1002/anie.202314569.

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Анотація:

Developing novel synthesis technologies is crucial to expanding bifunctional electrocatalysts for energy‐saving hydrogen production. Herein, we report an ambient and controllable γ‐ray radiation reduction to synthesize a series of noble metal nanoparticles anchored on defect‐rich manganese oxides (M@MnO2‐x, M = Ru, Pt, Pd, Ir) for glycerol‐assisted H2 evolution. Benefiting from the strong penetrability of γ‐rays, nanoparticles and defect supports are formed simultaneously and bridged by metal‐oxygen bonds, guaranteeing structural stability and active site exposure. The special Ru‐O‐Mn bonds ac

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9

Fan, Yamei, Rongtan Li, Beibei Wang, et al. "Water-assisted oxidative redispersion of Cu particles through formation of Cu hydroxide at room temperature." Nature Communications 15, no. 1 (2024). http://dx.doi.org/10.1038/s41467-024-47397-z.

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AbstractSintering of active metal species often happens during catalytic reactions, which requires redispersion in a reactive atmosphere at elevated temperatures to recover the activity. Herein, we report a simple method to redisperse sintered Cu catalysts via O2-H2O treatment at room temperature. In-situ spectroscopic characterizations reveal that H2O induces the formation of hydroxylated Cu species in humid O2, pushing surface diffusion of Cu atoms at room temperature. Further, surface OH groups formed on most hydroxylable support surfaces such as γ-Al2O3, SiO2, and CeO2 in the humid atmosph

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Дисертації з теми "Spectroscopie-γ prompte"

1

Karam, Habib. "Mise au point de la mesure de sections efficaces de réactions (n,XN) par spectroscopie γ prompte sur des cibles très radioactives". Strasbourg, 2009. http://www.theses.fr/2009STRA6014.

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Анотація:

La loi « Bataille » fait obligation au CNRS de développer des recherches sur le retraitement des déchets nucléaires. C’est dans ce cadre que notre équipe GRACE (Groupe de Recherche sur l’Aval du Cycle Electronucléaire) de l’IPHC a entrepris des mesures nécessaires à la mise au point des réacteurs hybrides. Le champ de recherche s’est élargi puisqu’il inclut maintenant des études visant à développer le cycle de Thorium. GRACE s’est plus précisément attaché à mesurer des sections efficaces de réactions (n,xng) mal connues jusqu’à présent ou pour lesquelles aucune mesure n’existe. Les mesures ont

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2

Claeys, François. "Mesure, modélisation et évaluation de sections efficaces à seuil (n, xnγ) d’intérêt pour les applications de l’énergie nucléaire". Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAE027.

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Анотація:

Dans le contexte du développement des réacteurs de génération IV, des données nucléaires précises sont requises. Dans ce travail de thèse, on s’intéresse en particulier à la section efficace de diffusion inélastique (n, n’) pour les noyaux d’233U et d’238U. L'analyse des données de GRAPhEME, dispositif combinant les méthodes de la spectroscopie-γ prompte et du temps de vol, ont permis d’obtenir, pour la première fois, 12 sections efficaces 233U(n, n’γ). Une modélisation des sections efficaces de ces deux isotopes (233U et 238U) a été réalisée avec le code de réaction nucléaire TALYS. Dans le c

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3

Lukić, Strahinja. "Mesure de sections efficaces de réaction (n,xn) par spéctroscopie γ prompte auprès d'un faisceau à très haut flux instantané". Université Louis Pasteur (Strasbourg) (1971-2008), 2004. https://publication-theses.unistra.fr/public/theses_doctorat/2004/LUKIC_Strahinja_2004.pdf.

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Анотація:

Le travail présenté dans ce mémoire se situe dans le contexte du programme de nouvelles mesures de sections efficaces de réactions induites par neutron. Ce programme est motivé par les perspectives offertes depuis peu de temps par les projets innovants de traitement des déchets nucléaires et de production d’énergie. Cette motivation est présentée dans l’introduction. Il existe des bases de données diverses pour les sections efficaces de toutes les réactions sur tous les matériaux présents dans les réacteurs actuels. Pour ces réactions, ces bases reposent sur des données expérimentales évaluées

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