{"type": "FeatureCollection", "features": [{"id": "10.1002/chem.202002602", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:14:11Z", "type": "Journal Article", "created": "2020-08-27", "title": "May Trifluoromethylation and Polymerization of Styrene Occur from a Perfluorinated Persistent Radical (PPFR)?", "description": "Abstract<p>The radical polymerization of styrene (St) initiated by a trifluoromethyl radical generated from a perfluorinated highly branched persistent radical (PPFR) is presented with an isolated yield above 70\uffe2\uff80\uff89%. The release of .CF3 radical occurred from a temperature above 85\uffe2\uff80\uff89\uffc2\uffb0C. Deeper 1H and 19F\uffe2\uff80\uff85NMR spectroscopies of the resulting fluorinated polystyrenes (CF3\uffe2\uff80\uff90PSts) evidenced the presence of both CF3 end\uffe2\uff80\uff90group of the PSt chain and the trifluoromethylation of the phenyl ring (in meta\uffe2\uff80\uff90position mainly). [PPFR]0/[St]0 initial molar ratios of 3:1, 3:10 and 3:100 led to various molar masses ranging from 1750 to 5400\uffe2\uff80\uff85g\uffe2\uff80\uff89mol\uffe2\uff88\uff921 in 70\uffe2\uff80\uff9386\uffe2\uff80\uff89% yields. MALDI\uffe2\uff80\uff90TOF spectrometry of such CF3\uffe2\uff80\uff90PSts highlighted polymeric distributions which evidenced differences between m/z fragments of 104 and 172 corresponding to styrene and trifluoromethyl styrene units, respectively. Such CF3\uffe2\uff80\uff90PSt polymers were also compared to conventional PSts produced from the radical polymerization of St initiated by a peroxydicarbonate initiator. A mechanism of the polymerization is presented showing the formation of a trifluoromethyl styrene first, followed by its radical (co)polymerization with styrene. The thermal properties (thermal stability and glass transition temperature, Tg) of these polymers were also compared and revealed a much better thermal stability of the CF3\uffe2\uff80\uff90PSt (10\uffe2\uff80\uff89% weight loss at 356\uffe2\uff80\uff93376\uffe2\uff80\uff89\uffc2\uffb0C) and a Tg of around 70\uffe2\uff80\uff89\uffc2\uffb0C.</p", "keywords": ["NMR spectroscopy", "[CHIM.POLY]Chemical Sciences/Polymers", "styrene", "radical polymerization", "01 natural sciences", "fluorinated radicals", "MALDI spectrometry", "0104 chemical sciences"]}, "links": [{"href": "https://doi.org/10.1002/chem.202002602"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemistry%20%E2%80%93%20A%20European%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/chem.202002602", "name": "item", "description": "10.1002/chem.202002602", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/chem.202002602"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-10-26T00:00:00Z"}}, {"id": "10.1007/s00374-007-0254-2", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:14:30Z", "type": "Journal Article", "created": "2007-12-10", "title": "Soil Organic Phosphorus And Microbial Community Composition As Affected By 26 Years Of Different Management Strategies", "description": "Open AccessBiology and Fertility of Soils, 44 (5)", "keywords": ["2. Zero hunger", "550", "crop rotation; FAME; microbial community composition; solution P-31 NMR spectroscopy; soil organic phosphorus", "microbial community composition", "Solution 31P NMR spectroscopy", "04 agricultural and veterinary sciences", "solution P-31 NMR spectroscopy", "15. Life on land", "soil organic phosphorus", "630", "6. Clean water", "FAME", "Microbial community composition", "crop rotation", "Crop rotation", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Soil organic phosphorus"]}, "links": [{"href": "https://doi.org/10.1007/s00374-007-0254-2"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biology%20and%20Fertility%20of%20Soils", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00374-007-0254-2", "name": "item", "description": "10.1007/s00374-007-0254-2", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00374-007-0254-2"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-12-11T00:00:00Z"}}, {"id": "10.1007/s10705-010-9377-1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:14:46Z", "type": "Journal Article", "created": "2010-06-03", "title": "Quality Of Soil Organic Matter And C Storage As Influenced By Cropping Systems In Northwestern Alberta, Canada", "description": "Crop rotations and reduction in tillage are commonly recommended for sustained crop production and enhancing soil quality. Our objective was to evaluate the long-term effects of cropping systems (1968\u20131992) on soil structure, carbon storage and the quality of soil organic matter. The study was conducted on a silt clay loam soil (Typic Cryoboralf) near Beaverlodge, Alberta, The cropping systems were: (a) continuous barley (Hordeum vulgare L.) (CB); (b) continuous bromegrass (Bromus inermiss Leyess.) (CG); (c) continuous forage legume (Medicago                         sativa L. until 1977, and Trifolium pratense L. since 1978) (CL); and (d) 3\u00a0years of bromegrass-legume forage alternating with 3\u00a0years of barley (RF). Our data showed that the CG and CL treatments had more stable aggregates with greater mean weight diameter (MWD) than soil under continuous barley. Organic C, total N and the light fraction in soil under CG and CL were higher than those of the other two treatments. Soil under CG had the highest and CB the lowest amounts of acid-hydrolyzable monosacchrides (comprising glucose, arabinose, xylose, mannose and galactose). Higher galactose\u00a0+\u00a0mannose concentration in soil under CG indicated a higher soil microbiological activity. Microbial biomass C and N followed the trend among treatments in whole and light fraction organic matter, and total extracted sugars. Soil organic matter 13C-NMR spectroscopy showed that: (i) soil under CB contained the highest amounts of aromatic and the lowest content of aliphatic-C, (ii) soil under CL had the lowest phenolic-C and the least aromaticity, and (iii) soil under CG and RF had the highest amounts of aliphatic-C which includes labile substances such as amino acids and carbohydrates, indicating an improvement in the quality of organic matter. It is concluded that perennial forage crops can improve soil structure and soil organic matter quality and quantity as compared with cereal monoculture.", "keywords": ["2. Zero hunger", "Aggregation", "13C-NMR spectroscopy", "Carbon storage", "Carbohydrates", "Microbial biomass", "Light fraction organic matter", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water"], "contacts": [{"organization": "Arshad, M. A., Soon, Y. K., Ripmeester, J. A,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s10705-010-9377-1"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nutrient%20Cycling%20in%20Agroecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10705-010-9377-1", "name": "item", "description": "10.1007/s10705-010-9377-1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10705-010-9377-1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-06-04T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2012.02.021", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:16:13Z", "type": "Journal Article", "created": "2012-03-08", "title": "Biodegradability Of Organic Matter In Fire-Affected Mineral Soils Of Southern Spain", "description": "Open AccessIncorporated into the soil, naturally formed pyrogenic organic matter (PyOM) is considered as highly recalcitrant, but direct estimation of PyOM decomposition rates are scarce. With this aim in mind, we subjected organic matter (OM) of fire-affected and unaffected soils to biochemical degradation under laboratory conditions and monitored CO2 production over a period of seven months. The soils derived from the Sierra de Aznalc\u00f3llar, Southern Spain, and were sampled 4 weeks and 5 years after a severe fire. Virtual fractionation of the solid-state 13C nuclear magnetic resonance (NMR) spectra of the fire-affected soils into fire-unaffected soil organic matter (SOM) and PyOM yielded charcoal C contributions of 30 to 50% to the total organic C (Corg) of the sample. Fitting the respiration data with a double exponential decay model revealed a fast carbon flush during the first three weeks of the experiment. Solid-state 13C NMR spectroscopy evidenced the contribution of aromatic moieties of the PyOM to this initial carbon release and to the biosynthesis of new microbial biomass. Considering the loss of microbiologically easily available fresh litter by wildfires, this relatively labile PyOM fraction may contribute to a fast recovery of a fire-affected site. The input of PyOM resulted in an increase of the mean residence time (MRT) of the slow OM pool of the soil by a factor of 3-4 to approximately 40 years. Assuming that under field conditions, the microbial activity corresponds to approximately 10% of the value observed under optimal laboratory conditions, MRTs of 500-600 years were estimated for the slow PyOM pool. The fact that these times are only 5-6 times longer than those calculated for fire-unaffected SOM rises doubts about the presumed big influence of PyOM as an additional C-sink in soils. On the other hand, although being small the difference in turnover rates is evident and has some major implication with respect to long-term alteration of the chemical composition of OM in fire-affected soils. In case of a reduced input of fresh litter, the preferential degradation of fire-unaffected SOM yields in a selective preservation of PyOM. To what extent this can alter soil properties, has still to be elucidated. In cultivated soils rarely affected by fire or with low charcoal input after burning of harvest, the impact of PyOM accumulation may be of minor importance. On the other hand, for soils regularly amended with high amounts of biochar or subjected to frequent natural or prescribed burnings, it may be an important factor.", "keywords": ["Respiration experiments", "Biochar", "Soil organic matter turnover", "Forest fires", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Solid-state NMR spectroscopy", "04 agricultural and veterinary sciences", "Virtual fractionation of SOM", "15. Life on land", "Pyrogenic organic matter"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2012.02.021"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2012.02.021", "name": "item", "description": "10.1016/j.soilbio.2012.02.021", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2012.02.021"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-01-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2012.07.026", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:16:14Z", "type": "Journal Article", "created": "2012-08-17", "title": "Physical, Chemical, And Biochemical Mechanisms Of Soil Organic Matter Stabilization Under Conservation Tillage Systems: A Central Role For Microbes And Microbial By-Products In C Sequestration", "description": "Open AccessPeer reviewed", "keywords": ["2. Zero hunger", "Aggregates", "Soil organic matter", "No-tillage", "Microbial biomass", "Organo-mineral complexes", "04 agricultural and veterinary sciences", "15. Life on land", "12. Responsible consumption", "C sequestrartion", "NMR spectroscopy", "0401 agriculture", " forestry", " and fisheries", "Conservation tillage"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2012.07.026"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2012.07.026", "name": "item", "description": "10.1016/j.soilbio.2012.07.026", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2012.07.026"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-02-01T00:00:00Z"}}, {"id": "10.1111/sum.12198", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:17:56Z", "type": "Journal Article", "created": "2015-07-31", "title": "Long-Term Effects Of Tillage, Nutrient Application And Crop Rotation On Soil Organic Matter Quality Assessed By Nmr Spectroscopy", "description": "Abstract<p>Crop and land management practices affect both the quality and quantity of soil organic matter (SOM) and hence are driving forces for soil organic carbon (SOC) sequestration. The objective of this study was to assess the long\uffe2\uff80\uff90term effects of tillage, fertilizer application and crop rotation onSOCin an agricultural area of southern Norway, where a soil fertility and crop rotation experiment was initiated in 1953 and a second experiment on tillage practices was initiated in 1983. The first experiment comprised 6\uffe2\uff80\uff90yr crop rotations with cereals only and 2\uffe2\uff80\uff90yr cereal and 4\uffe2\uff80\uff90yr grass rotations with recommended (base) and more than the recommended (above base) fertilizer application rates; the second experiment dealt with autumn\uffe2\uff80\uff90ploughed (conventional\uffe2\uff80\uff90till) plots and direct\uffe2\uff80\uff90drilled plots (no\uffe2\uff80\uff90till). Soil samples at 0\uffe2\uff80\uff9310 and 10\uffe2\uff80\uff9330\uffc2\uffa0cm depths were collected in autumn 2009 and analysed for their C and N contents. The quality ofSOMin the top layer was determined by13C solid\uffe2\uff80\uff90stateNMRspectroscopy. TheSOCstock did not differ significantly because of rotation or fertilizer application types, even after 56\uffc2\uffa0yr. However, the no\uffe2\uff80\uff90till system showed a significantly higherSOCstock than the conventional\uffe2\uff80\uff90till system at the 0\uffe2\uff80\uff9310\uffc2\uffa0cm depth after the 26\uffc2\uffa0yr of experiment, but it was not significantly different at the 10\uffe2\uff80\uff9330\uffc2\uffa0cm depth. In terms of quality,SOMwas found to differ by tillage type, rate of fertilizer application and crop rotation. The no\uffe2\uff80\uff90till system showed an abundance of O\uffe2\uff80\uff90alkyl C, while conventional\uffe2\uff80\uff90till system indicated an apparently indirect enrichment in alkyl C, suggesting a more advanced stage ofSOMdecomposition. The long\uffe2\uff80\uff90term quantitative and qualitative effects onSOMsuggest that adopting a no\uffe2\uff80\uff90tillage system and including grass in crop rotation and farmyard manure in fertilizer application may contribute to preserve soil fertility and mitigate climate change.</p>", "keywords": ["Fertilizer application", "2. Zero hunger", "Crop rotation", " fertilizer application", " soil organic carbon (SOC)", " soil organic matter (SOM)", " tillage", " NMR spectroscopy.", "NMR spectroscopy", "Crop rotation", "Soil organic matter (SOM)", "13. Climate action", "Soil organic carbon (SOC)", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "Tillage"]}, "links": [{"href": "https://doi.org/10.1111/sum.12198"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Use%20and%20Management", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/sum.12198", "name": "item", "description": "10.1111/sum.12198", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/sum.12198"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-07-31T00:00:00Z"}}, {"id": "32853467", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:23:17Z", "type": "Journal Article", "created": "2020-08-27", "title": "May Trifluoromethylation and Polymerization of Styrene Occur from a Perfluorinated Persistent Radical (PPFR)?", "description": "Abstract<p>The radical polymerization of styrene (St) initiated by a trifluoromethyl radical generated from a perfluorinated highly branched persistent radical (PPFR) is presented with an isolated yield above 70\uffe2\uff80\uff89%. The release of .CF3 radical occurred from a temperature above 85\uffe2\uff80\uff89\uffc2\uffb0C. Deeper 1H and 19F\uffe2\uff80\uff85NMR spectroscopies of the resulting fluorinated polystyrenes (CF3\uffe2\uff80\uff90PSts) evidenced the presence of both CF3 end\uffe2\uff80\uff90group of the PSt chain and the trifluoromethylation of the phenyl ring (in meta\uffe2\uff80\uff90position mainly). [PPFR]0/[St]0 initial molar ratios of 3:1, 3:10 and 3:100 led to various molar masses ranging from 1750 to 5400\uffe2\uff80\uff85g\uffe2\uff80\uff89mol\uffe2\uff88\uff921 in 70\uffe2\uff80\uff9386\uffe2\uff80\uff89% yields. MALDI\uffe2\uff80\uff90TOF spectrometry of such CF3\uffe2\uff80\uff90PSts highlighted polymeric distributions which evidenced differences between m/z fragments of 104 and 172 corresponding to styrene and trifluoromethyl styrene units, respectively. Such CF3\uffe2\uff80\uff90PSt polymers were also compared to conventional PSts produced from the radical polymerization of St initiated by a peroxydicarbonate initiator. A mechanism of the polymerization is presented showing the formation of a trifluoromethyl styrene first, followed by its radical (co)polymerization with styrene. The thermal properties (thermal stability and glass transition temperature, Tg) of these polymers were also compared and revealed a much better thermal stability of the CF3\uffe2\uff80\uff90PSt (10\uffe2\uff80\uff89% weight loss at 356\uffe2\uff80\uff93376\uffe2\uff80\uff89\uffc2\uffb0C) and a Tg of around 70\uffe2\uff80\uff89\uffc2\uffb0C.</p", "keywords": ["[CHIM.POLY] Chemical Sciences/Polymers", "NMR spectroscopy", "styrene", "radical polymerization", "01 natural sciences", "fluorinated radicals", "MALDI spectrometry", "0104 chemical sciences"]}, "links": [{"href": "https://doi.org/32853467"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemistry%20%E2%80%93%20A%20European%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "32853467", "name": "item", "description": "32853467", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/32853467"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-10-26T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NMR+spectroscopy&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NMR+spectroscopy&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NMR+spectroscopy&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NMR+spectroscopy&offset=7", "hreflang": "en-US"}], "numberMatched": 7, "numberReturned": 7, "distributedFeatures": [], "timeStamp": "2026-09-22T14:51:18.558661Z"}