Resultados de búsqueda - "Nuclear magnetic resonance"

Characterization of Peatland Soils from the High Andes through 13C Nuclear Magnetic Resonance Spectroscopy por Segnini, A., Souza, A.A. de, Novotny, E.H., Milori, D.M.B.P., Silva, W.T.L. da, Bonagamba, T.J., Posadas, A., Quiróz, R.

“…Whole soil samples from Peruvian bofedales (highland peatlands), located at an average altitude of 3881 m above sea level, were analyzed through 13C solid-state nuclear magnetic resonance (13C SSNMR) spectroscopy. The objective was to make a semi-quantitative characterization of the predominant organic chemical structures and to compare the organic matter from permanently and seasonally flooded peatlands soils as well as to characterize the changes throughout the soil profile using principal component analysis (PCA) of 13C-SSNMR spectra. …”
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13C-NMR assignments for methyls and muaternary carbons of the limonoid obacunone por Rugutt, J.K., Fischer, N.H., Nauman, M.A., Schmidt, T.J., Berner, D.K.

Materias: “…nuclear magnetic resonance spectroscopy…”
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Multinuclear magnetic resonance analysis of two humic acid fractions from lowland rice soils por Mahieu, N., Olk, D.C., Randall, E.W.

Materias: “…nuclear magnetic resonance…”
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Conserved chemical properties of young humic acid fractions in tropical lowland soil under intensive irrigated rice cropping por OLK, CASSMAN, MAHIEU, RANDALL

Materias: “…nuclear magnetic resonance spectroscopy…”
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Diurnal changes in shoot water dynamics are synchronized with hypocotyl elongation in Arabidopsis thaliana por Ishikawa, H., Sato-Nara, K., Takase, T., Suzuki, H.

“…We recently demonstrated the circadian clock modulated water dynamics in the roots of a small model plant, Arabidopsis thaliana, by the Nuclear Magnetic Resonance (NMR) microimaging technique. Our developed technique was able to visualize the water distribution that depended on differences in the 1H signal among region in the shoot, such as the shoot apex, the hypocotyl and the root shoot junction. …”
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Internal mechanisms of plant adaptation to aluminum toxicity and phosphorus starvation in three tropical forages por Watanabe, Toshihiro, Osaki, Mitsuru, Yano, Hiromi, Rao, Idupulapati M.

“…The tropical grasses tolerated high levels of Al toxicity and P starvation, with the Brachiaria hybrid maintaining very low levels of Al concentration in shoots. 27Al Nuclear Magnetic Resonance spectroscopy (NMR) analysis revealed that, in the Brachiaria hybrid, Al makes complexes with some ligands such as organic-acid anions in the root symplast. …”
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Historical charcoal additions alter water extractable, particulate and bulk soil C composition and stabilization por Abdelrahman, H., Hofmann, D., Berns, A.E., Meyer, N., Bol, R., Borchard, N.

“…The SOM molecular characteristics were investigated in the solid phase by nuclear magnetic resonance (NMR) and in the WEOM by Fourier transform ion cyclotron resonance mass spectrometry (FT‐ICR‐MS). …”
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Secondary metabolite profile and phytotoxic activity of genetically distinct forms of Colletotrichum gloeosporioides from yam (Dioscorea spp.) por Abang, Mathew M., Abraham, W.R., Asiedu, Robert, Hoffmann, P., Wolf, G., Winter, S.

“…Analysis of two toxin fractions unique to the pathogenic FGS and SGG forms using hlpc, mass spectrometry and nuclear magnetic resonance suggested the presence of a low molecular weight amide peptide. …”
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Morphological and metabolic profiling of a tropical‐adapted potato association panel subjected to water recovery treatment reveals new insights into plant vigor por Toubiana, D., Cabrera, R., Salas, E., Maccera, C., Franco dos Santos, G., Cevallos, D., Lindqvist-Kreuze, H., López, J., Maruenda, H.

“…All potato genotypes were profiled for 45 morphological traits and 42 central metabolites via nuclear magnetic resonance. Statistical tests and norm of reaction analysis revealed that the observed variations were trait specific, that is, genotypic versus environmental. …”
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Cornflake production process: state diagram and water mobility characteristics por Farroni, Abel Eduardo, Buera, María del Pilar

“…Complementarily, time-resolved proton nuclear magnetic resonance (1H-TD-NMR) was used to evaluate the dynamic aspects at different stages of the classical cornflake production process. …”
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Exploring the biochemical, technical and applicative characteristics of pullulan produced by different strains of Aureobasidium pullulans por Cignola, Rudy, Palou, Lluís, Pérez-Gago, María B., Lovison, D., Di Foggia, M., Basso, F., Daniso, E., Garagozzo, L., De Marco, R., Colautti, A., Firrao, G., Di Francesco, Alessandra

“…Pullulan produced by the strains was biochemically characterized by FT-IR (Fourier Transform Infrared Spectroscopy), DSC (Differential Scanning Calorimetry) and NMR (Nuclear Magnetic Resonance) analyses. By FT-IR and DSC analysis, the AP1 pullulan displayed to be more capable to entrap moisture in its structure, and by NMR, it showed to be more similar to the commercial pullulan. …”
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Long-term black carbon dynamics in cultivated soil por Nguyen, B.T., Lehmann, Johannes, Kinyangi, James, Smernik, R., Riha, S.J., Engelhard, M.H.

“…In this study, the long-term dynamics in quality and quantity of BC were investigated in cultivated soil using X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) techniques. BC particles and changes in BC stocks were obtained from soil collected in fields that were cleared from forest by fire at 8 different times in the past (2, 3, 5, 20, 30, 50, 80 and 100 years before sampling) in western Kenya. …”
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Phosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerrados por Lilienfein, J, Wilcke, W., Neufeldt, Henry, Ayarza, Miguel Angel, Zech, W.

“…Additionally, P binding was examined with 31P nuclear magnetic resonance spectroscopy. Total P concentrations were 70-170 mg/kg in the loamy and 300-450 mg/kg in the clayey soil. …”
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Vibrational study of caffeic acid phenethyl ester, a potential anticancer agent, by infrared, Raman, and NMR spectroscopy por Raschi, Ana Beatriz, Romano, Elida, Castillo, María Victoria, Leyton, Patricio, Paipa, Carolina, Maldonado, Luis Maria, Brandan, Silvia Antonia

“…The structural and vibrational properties of caffeic acid phenethyl ester (CAPE) were studied using infrared and Raman spectroscopy in the solid phase and multidimensional nuclear magnetic resonance (NMR) spectroscopy in solution. The theoretical structures of the compound and of its dimer in the gas phase and in DMSO solution by using density functional theory (DFT) were studied. …”
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Metabolic classification of South American Ilex species by NMR-based metabolomics por Kim, Hye Kyong, Saifullah, Khan, Saifullah A.Jamil, Wilson, Erica Georgina, Prat Kricun, Sergio, Meissner, Axel, Göraler, Sibel, Deelder, André Martien, Choi, Young-hae, Verpoorte, Robert

“…In this study, nuclear magnetic resonance (NMR) spectroscopy-based metabolomics was applied to the classification of 11 South American Ilex species, namely, Ilex argentina, Ilex brasiliensis, Ilex brevicuspis, Ilex dumosa var. dumosa, I. dumosa var. guaranina, Ilex integerrima, Ilex microdonta, I. paraguariensis var. paraguariensis, Ilex pseudobuxus, Ilex taubertiana, and Ilex theezans. 1H NMR combined with principal component analysis (PCA), partial least square-discriminant analysis (PLS-DA) and hierarchical cluster analysis (HCA) showed a clear separation between species and resulted in four groups based on metabolomic similarities. …”
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Revaluation of waste from fishing industry through generation of chitosan coatings to improve quality and extend shelf-life of minimally processed lettuce por Fasciglione, Gabriela, Goñi, Maria Gabriela, Yommi, Alejandra Karina, Perez Bravo, Jonas, Ortueta, R., Scampini, A., Buffa, L., Andreu, Adriana, Creus, Cecilia

“…In this study, an industrial chitosan obtained in Argentina and a commercial chitosan were physicochemically characterized and evaluated as edible coating for biopreservation of minimally processed lettuce. Based on Nuclear Magnetic Resonance, X-ray diffraction and thermogravimetric and viscosimetric assays we conclude that both biopolymers have similar molecular weight and deacetylation degree. …”
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Cocoa shell: an industrial by-product for the preparation of suspensions of holocellulose nanofibers and fat por Gómez Hoyos, C., Mazo Márquez , P., Penagos Vélez , L., Serpa Guerra, A., Eceiza, A., Urbina , L., Velásquez Cock, J., Gañán Rojo , P., Vélez Acosta, L., Zuluaga, R.

“…The material was characterized with attenuated total reflection– Fourier transform infrared spectroscopy (ATR–FTIR), solid-state 13C nuclear magnetic resonance (13C NMR), X-ray diffraction (XRD), fluorescence and atomic force microscopy (AFM). …”
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Investigation into the metabolic effect of sarcosine on prostate cancer por Larsson, Simon

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Spectroscopy and swelling soils: An integrated approach por Kariuki, P.C.

“…Finally a prove of concept as to the poten tial discrimination of swelling soils under buried non-swelling soils was also expl ored where two geophysical methods consisting of Induced Polarisation (IP) and Nuclear Magnetic Resonance (NMR) known to give indication as to the CEC, moisture and clay mineralogy differences were used at a laboratory scale with the aim of identifying the problems to be overcome for such methods to be applicab le in a field setting where they would provide faster ways of establishing the swelling potential characteristics based on the fact that these soil properties are the key to their swelling behaviour. …”
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UV-Vis spectroscopy and chemometric: a simple method to differentiate honey, partially ripe honey and nectars por Maldonado, Luis Maria, Marcinkevicius, Karenina, Alvarez, Alejandro Raul, Salomon, Virginia María, Gaggiotti, Monica Del Carmen, Messina, Natalia, Palacio, María Alejandra, Medina, S., Maldonado, Mario Miguel, Orellano, Emanuel, Bedascarrasbure, Enrique Luciano

“…High-complexity and sensitivity techniques are used to detect such adulterations, like isotopic analysis and Nuclear Magnetic Resonance. However, a simpler, high-speed, low cost and more accessible analytical method would be more convenient to perform food analyses, particularly for bee products. …”
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