Resultados de búsqueda - "spectroscopy"

How robust is water quality determination with optical measurements for highly polluted agricultural waters? por Uwera, Honorine

“…To characterize suspended sediments (SS) and dissolved organic matter (DOM) in surface water some optical measurements have been used (absorbance and fluorescence spectroscopy). This study aims to use laboratory optical instruments (using turbidimeter and fluorescence and absorbance spectrophotometer) to evaluate how different sediment concentrations measured as turbidity affect fluorescence and absorbance determination of the dissolved organic matter. …”

Organic matter properties and their relation to phosphorus and nitrogen concentrations in Swedish agricultural streams por Ehnvall, Betty

“…DOM was analyzed optically using excitation-emission fluorescence spectroscopy (EEM) and absorbance spectroscopy (UV/Vis). …”
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Agro-ecology, resource endowment and indigenous knowledge interactions modulate soil fertility in mixed farming systems in central and western Ethiopia por Agumas, B., Balume, I., Musyoki, M.K., Benz, M., Nziguheba, G., Marohn, C., Vanlauwe, Bernard, Cardisch, G., Rasche, F.

“…To verify this assumption, this study hypothesized that soil fertility variability across two regions in Central and Western Ethiopia is determined by inter‐related effects of agro‐ecological zones and farmers’ resource endowment (‘wealthy’ versus ‘poor’ farmers). Mid‐infrared spectroscopy coupled to partial least squares regression (midDRIFTS‐PLSR) and wet‐laboratory analyses were used to assess the soil fertility (soil pH, total soil carbon [TC] and nitrogen [TN], plant‐available phosphorous [Pav] and potassium [Kav]) across four agro‐ecological zones: ‘High‐Dega’ (HD), ‘Dega’ (D), ‘Weina‐Dega’ (WD) and ‘Kola’ (K). …”
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Methodology for Measuring Greenhouse Gas Emissions from Agricultural Soils Using Non-isotopic Techniques por Zaman, M., Kleineidam, K., Bakken, L., Berendt, J., Bracken, C., Butterbach-Bahl, Klaus, Cai, Z., Chang, S.X., Clough, T., Dawar, K., Ding, W.X., Dörsch, P., Reis Martins, M. dos, Eckhardt, C., Fiedler, S., Frosch, T., Goopy, John P., Görres, C.M., Gupta, A., Henjes, S., Hofmann, M.E.G., Horn, M.A., Jahangir, M.M.R., Jansen-Willems, A., Lenhart, K., Heng, L., Lewicka-Szczebak, D., Lucic, G., Merbold, Lutz, Mohn, J., Molstad, L., Moser, G., Murphy, P., Sanz-Cobena, A., Šimek, M., Urquiaga, S., Well, R., Wrage-Mönnig, N., Zaman, S., Zhang, J., Müller, Christoph

“…Another technique which is still under development, but provides a potentially superior method, is Raman spectroscopy. Not only the GHGs, but also N2, can potentially be analysed if the precision of these techniques is increased in future development. …”
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Prediction of functional characteristics of gari (cassava flakes) using near-infrared reflectance spectrometry por Adesokan, Michael, Alamu, Emmanuel Oladeji, Fawole, S., Maziya-Dixon, Busie

“…Therefore, this study aimed to develop high-throughput and less expensive prediction models for water absorption capacity, swelling power, bulk density, and dispersibility using Near-Infrared Reflectance Spectroscopy (NIRS). Gari was produced from 63 cassava genotypes using the standard method developed in the RTB foods project. …”
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Root exudate fingerprint of Brachiaria humidicola reveals vanillin as a novel and effective nitrification inhibitor por Egenolf, Konrad, Schöne, Jochen, Conrad, Jürgen, Braunberger, Christina, Beifuß, Uwe, Arango, Jacobo, Rasche, Frank

“…Chemical structures were elucidated by HRMS as well as 1D and 2D NMR spectroscopy. Nitrification inhibiting potential of isolated metabolites was evaluated by a Nitrosomonas europaea based bioassay. …”
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Nutritional quality dataset by wet chemistry and near infrared measurements from dry tissue of Urochloa humidicola por Camelo, Rodrigo A., Cardoso, Juan, Rosa Noemi, Jauregui, Espitia, Paula Andrea, Mazabel Parra, Lady Johanna

“…From 2011 to 2019, samples of Urochloa humidicola (Rendle) Morrone & Zuloaga from the breeding program have been harvested to collect near-infrared (NIR) spectroscopy data at the Alliance of Bioversity and CIAT . …”
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Organic matter stabilization in soil aggregates: understanding the biogeochemical mechanisms that determine the fate of carbon inputs in soils por Verchot, Louis V., Dutaur, L., Shepherd, Keith D., Albrecht, A.

“…Organic matter characterization of each fraction was based on 13C isotope abundance, Fourier transform infrared (FTIR) spectroscopy and the abundance of polysaccharides. Improved fallows increased soil C by 0.28 and 0.26 kg m-2 in the top 20 cm of the soil profile in Luero and Teso, respectively. …”
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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. …”
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Relevance and limitations of biogenic and physicogenic classification: a comparison of approaches for differentiating the origin of soil aggregates por Jouquet, Pascal, Zangerle, A., Rumpel, C., Brunet, D., Bottinelli, N., Tran Duc Toan

“…We then analysed aggregate morphology, elemental and stable isotope composition and soil stability, and used near-infrared spectroscopy (NIRS) to determine their chemical characteristics. …”
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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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Soil organic carbon stocks in semi-arid West African drylands: implications for climate change adaptation and mitigation por Tondoh, Jérôme E., Ouédraogo, Issa, Bayala, Jules, Tamene, Lulseged D., Sila, Andrew M., Vågen, Tor-Gunnar, Kalinganiré, Antoine

“…Soil samples were collected from three sites of 100 km2 stratified into 16 clusters and 160 plots and thereafter soil parameters were then analyzed using MIR spectroscopy. Regardless of soil strata, SOC storage with 95% confidence level in semi-arid landscapes potentially ranged between 112,200±14,000 and 253,000±34,000 Mg C corresponding to 411,400±51,333 Mg CO2-eq and 927,666.7±124,666.7 Mg CO2-eq in the entire study area. …”
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Aggregation kinetics of humic acids in the presence of calcium ions por Kloster, Nanci Soledad, Brigante, Maximiliano Eduardo, Zanini, Graciela Pilar, Avena, Marcelo Javier

“…The aggregation kinetics of a humic acid (HA) sample as a function of Ca2+ concentration at pH 5, 7 and 9 was investigated. UV–VIS spectroscopy was employed to quantify the progress of the aggregation reaction, and electrophoresis was used to evaluate the zeta potential of the HA molecules. …”
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Upptag av tungmetaller i maskros (Taraxacum officinale) : förekomst och påverkan av bly och kadmium vid odling i Malmö stad por Lundström, Emma

Butorfanol till get por Gustafsson, Helena

“…Plasma concentrations of butorphanol were analysed with a liquid chromatography–electrospray ionization–tandem mass spectroscopy and the limit of quantification was 0.5 ng butorphanol/ ml plasma. …”
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Uso de la espectroscopia visible e infrarrojo cercano para estimar propiedades de suelo en Argentina por Ortiz, Daniela Alejandra, De Dios Herrero, Juan, Kloster, Nanci Soledad

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Can soil fertility properties in rice fields in sub-Saharan Africa be predicted by digital soil information? A case study of AfSoilGrids250m por Djagba, J.F., Johnson, J.M., Saito, Kazuki

“…The objective of this study was to assess the accuracy of AfSoilGrids250m by comparing predicted soil fertility properties including pH H2O, clay and silt contents, total nitrogen (TN) and organic carbon (OC) with wet chemistry (WC) analysis and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) methods. Soil samples were collected from 1002 rice fields in three production systems (irrigated lowland, rainfed lowland, and rainfed upland) in 32 sites and over five agro-ecological zones (AEZ). …”
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Multidrug antibiotic resistance index and antimicrobial resistance patterns of Escherichia coli in intensive pig farms in Kenya por Inguyesi, C., Olum, M., Ndirangu, P., Langat, N., Jesang, A., Masila, E., Wachuka, E., Onywera, R., Muloi, Dishon M., Ochieng, Linnet, Yamo, V., Momanyi, K., Muinde, P., Maichomo, M.

“…The samples were cultured, and 112 <i>E. coli</i> isolates were identified using standard microbiological procedures and confirmed by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectroscopy (MALDI-TOF MS). Antibiotic susceptibility testing was performed using the Kirby–Bauer disc diffusion method against ampicillin, amoxicillin-clavulanic acid, gentamicin, trimethoprim-sulfamethoxazole, chloramphenicol, enrofloxacin and cefotaxime. …”
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Extractable soil nutrient effects on feed quality traits of crop residues in the semiarid rainfed mixed crop-livestock farming systems of Southern India por Haileslassie, Amare, Blümmel, Michael, Wani, S.P., Sahrawat, Kanwar Lal, Pardhasaradhi, G., Samireddypalle, A.

“…Samples were collected for CR feed quality trait analysis using Near Infrared Reflectance Spectroscopy. The result showed that for cereal and oil crops, extractable soil S was significantly negatively associated with anti-feed quality traits such as neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL) (P < 0.01), but significantly positively related to metabolizable energy (ME) and in vitro digestibility (P < 0.01). …”
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Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya : An application of classification and regression tre... por Tittonell, Pablo A., Shepherd, Keith D., Vanlauwe, Bernard, Giller, Kenneth E.

“…Soil samples were analysed by wet chemistry methods (1/3 of the samples) and also by near infrared diffuse reflectance spectroscopy (all samples). Spectral prediction models for different soil indicators were developed to estimate soil properties for the 2/3 of the samples not analysed by wet chemistry. …”
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