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Journal articles on the topic 'Organic tracers'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Shen, R. Q., X. Ding, Q. F. He, Z. Y. Cong, Q. Q. Yu, and X. M. Wang. "Seasonal variation of secondary organic aerosol tracers in Central Tibetan Plateau." Atmospheric Chemistry and Physics 15, no. 15 (2015): 8781–93. http://dx.doi.org/10.5194/acp-15-8781-2015.

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Abstract. Secondary organic aerosol (SOA) affects the earth's radiation balance and global climate. High-elevation areas are sensitive to global climate change. However, at present, SOA origins and seasonal variations are understudied in remote high-elevation areas. In this study, particulate samples were collected from July 2012 to July 2013 at the remote Nam Co (NC) site, Central Tibetan Plateau and analyzed for SOA tracers from biogenic (isoprene, monoterpenes and β-caryophyllene) and anthropogenic (aromatics) precursors. Among these compounds, isoprene SOA (SOAI) tracers represented the ma

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2

Shen, R. Q., X. Ding, Q. F. He, Z. Y. Cong, Q. Q. Yu, and X. M. Wang. "Seasonal variation of secondary organic aerosol in Nam Co, Central Tibetan Plateau." Atmospheric Chemistry and Physics Discussions 15, no. 5 (2015): 7141–69. http://dx.doi.org/10.5194/acpd-15-7141-2015.

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Abstract. Secondary organic aerosol (SOA) affects the earth's radiation balance and global climate. High-elevation areas are sensitive to global climate change. However, at present, SOA origins and seasonal variations are understudied in remote high-elevation areas. In this study, particulate samples were collected from July 2012 to July 2013 at the remote Nam Co (NC) site, Central Tibetan Plateau and analyzed for SOA tracers from biogenic (isoprene, monoterpenes and β-caryophyllene) and anthropogenic (aromatics) precursors. Among these compounds, isoprene SOA (SOAI) tracers represented the ma

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3

Guo, Tianfeng, Zhigang Guo, Juntao Wang, Jialiang Feng, Huiwang Gao, and Xiaohong Yao. "Tracer-based investigation of organic aerosols in marine atmospheres from marginal seas of China to the northwest Pacific Ocean." Atmospheric Chemistry and Physics 20, no. 8 (2020): 5055–70. http://dx.doi.org/10.5194/acp-20-5055-2020.

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Abstract. We investigated the geographic distributions of organic tracers in total suspended particles over the marginal seas of China, including the Yellow and Bohai seas (YBS) and the South China Sea (SCS), and the northwest Pacific Ocean (NWPO) in spring, when Asian outflows strongly affect downwind marine atmospheres. The comparison of levoglucosan observed in this study with values from the literature showed that the concentrations of biomass burning aerosols over the NWPO increased largely in 2014. However more observations, in addition to our snapshot measurement, are need to confirm wh

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4

Wan, Xin, Shichang Kang, Maheswar Rupakheti, et al. "Molecular characterization of organic aerosols in the Kathmandu Valley, Nepal: insights into primary and secondary sources." Atmospheric Chemistry and Physics 19, no. 5 (2019): 2725–47. http://dx.doi.org/10.5194/acp-19-2725-2019.

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Abstract. Organic atmospheric aerosols in the Hindu Kush–Himalayas–Tibetan Plateau region are still poorly characterized. To better understand the chemical characteristics and sources of organic aerosols in the foothill region of the central Himalaya, the atmospheric aerosol samples were collected in Bode, a suburban site of the Kathmandu Valley (KV) over a 1-year period from April 2013 to April 2014. Various molecular tracers from specific sources of primary organic aerosols (POAs) and secondary organic aerosols (SOAs) were determined. Tracer-based estimation methods were employed to apportio

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5

Fu, P. Q., K. Kawamura, J. Chen, B. Charrière, and R. Sempéré. "Organic molecular composition of marine aerosols over the Arctic Ocean in summer: contributions of primary emission and secondary aerosol formation." Biogeosciences Discussions 9, no. 8 (2012): 10429–65. http://dx.doi.org/10.5194/bgd-9-10429-2012.

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Abstract. Organic molecular composition of marine aerosol samples collected during the MALINA cruise in the Arctic Ocean was investigated by gas chromatography/mass spectrometry. More than 110 individual organic compounds were determined in the samples and were grouped into different compound classes based on the functionality and sources. The concentrations of total quantified organics ranged from 7.3 to 185 ng m−3 (mean 47.6 ng m−3), accounting for 1.8–11.0% (4.8%) of organic carbon in the marine aerosols. Primary saccharides were found to be dominant organic compound class, followed by seco

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6

Fu, P. Q., K. Kawamura, J. Chen, B. Charrière, and R. Sempéré. "Organic molecular composition of marine aerosols over the Arctic Ocean in summer: contributions of primary emission and secondary aerosol formation." Biogeosciences 10, no. 2 (2013): 653–67. http://dx.doi.org/10.5194/bg-10-653-2013.

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Abstract. Organic molecular composition of marine aerosol samples collected during the MALINA cruise in the Arctic Ocean was investigated by gas chromatography/mass spectrometry. More than 110 individual organic compounds were determined in the samples and were grouped into different compound classes based on the functionality and sources. The concentrations of total quantified organics ranged from 7.3 to 185 ng m−3 (mean 47.6 ng m−3), accounting for 1.8–11.0% (4.8%) of organic carbon in the marine aerosols. Primary saccharides were found to be dominant organic compound class, followed by seco

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7

Zhang, Shiwei, Hao Tang, Qing Li, et al. "Secondary Organic Aerosols in PM2.5 in Bengbu, a Typical City in Central China: Concentration, Seasonal Variation and Sources." Atmosphere 12, no. 7 (2021): 854. http://dx.doi.org/10.3390/atmos12070854.

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To investigate the concentration, seasonal variation, and sources of secondary organic aerosols (SOAs) in the inland areas of central China, 244 seasonal PM2.5 samples were collected from January to October 2019 at one urban site and one suburban site simultaneously in Bengbu of Anhui Province. Concentrations of organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), and typical organic tracers, including saccharides, tracers of SOAs from isoprene, terpenes, and toluene, were measured. Results showed that Bengbu has high pollution levels of organic aerosols, with annua

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8

Bianchi, T. S., and E. A. Canuel. "Organic Geochemical Tracers in Estuaries." Organic Geochemistry 32, no. 4 (2001): 451. http://dx.doi.org/10.1016/s0146-6380(00)00188-1.

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9

Fu, P. Q., K. Kawamura, J. Chen, et al. "Diurnal variations of organic molecular tracers and stable carbon isotopic compositions in atmospheric aerosols over Mt. Tai in North China Plain: an influence of biomass burning." Atmospheric Chemistry and Physics Discussions 12, no. 4 (2012): 9079–124. http://dx.doi.org/10.5194/acpd-12-9079-2012.

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Abstract. Organic tracer compounds of tropospheric aerosols, as well as organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), and stable carbon isotope ratios (δ13C) of total carbon (TC) have been investigated for aerosol samples collected during early and late periods of Mount Tai eXperiment 2006 (MTX2006) field campaign in North China Plain. Total solvent extracts were investigated by gas chromatography/mass spectrometry. More than 130 organic compounds were detected in the aerosol samples. They were grouped into twelve organic compound classes, including biomass b

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10

Fu, P. Q., K. Kawamura, J. Chen, et al. "Diurnal variations of organic molecular tracers and stable carbon isotopic composition in atmospheric aerosols over Mt. Tai in the North China Plain: an influence of biomass burning." Atmospheric Chemistry and Physics 12, no. 18 (2012): 8359–75. http://dx.doi.org/10.5194/acp-12-8359-2012.

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Abstract. Organic tracer compounds, as well as organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), and stable carbon isotope ratios (δ13C) of total carbon (TC) have been investigated in aerosol samples collected during early and late periods of the Mount Tai eXperiment 2006 (MTX2006) field campaign in the North China Plain. Total solvent-extractable fractions were investigated by gas chromatography/mass spectrometry. More than 130 organic compounds were detected in the aerosol samples. They were grouped into twelve organic compound classes, including biomass burnin

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11

Kriest, Iris. "Calibration of a simple and a complex model of global marine biogeochemistry." Biogeosciences 14, no. 21 (2017): 4965–84. http://dx.doi.org/10.5194/bg-14-4965-2017.

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Abstract. The assessment of the ocean biota's role in climate change is often carried out with global biogeochemical ocean models that contain many components and involve a high level of parametric uncertainty. Because many data that relate to tracers included in a model are only sparsely observed, assessment of model skill is often restricted to tracers that can be easily measured and assembled. Examination of the models' fit to climatologies of inorganic tracers, after the models have been spun up to steady state, is a common but computationally expensive procedure to assess model performanc

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12

Wang, Qiongqiong, Shan Wang, Yuk Ying Cheng, et al. "Chemical evolution of secondary organic aerosol tracers during high-PM_2.5 episodes at a suburban site in Hong Kong over 4 months of continuous measurement." Atmospheric Chemistry and Physics 22, no. 17 (2022): 11239–53. http://dx.doi.org/10.5194/acp-22-11239-2022.

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Abstract. Secondary organic aerosol (SOA) makes a sizable contribution to fine-particulate-matter (PM2.5) pollution, especially during high-PM episodes. Past studies of SOA evolution at the episode scale mainly rely on measurements of bulk SOA mass, with few studies probing individual SOA molecular tracers. In this study, we continuously monitored (at a bi-hourly resolution) SOA tracers specific to a few common volatile organic compound (VOC) precursors at a suburban site in Hong Kong for a 4-month period from the end of August to December 2020. The SOA molecules include tracers for SOA derive

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13

Li, Yuanyuan, Zhanfang Hou, Yachen Wang, et al. "Diurnal Variations in High Time-Resolved Molecular Distributions and Formation Mechanisms of Biogenic Secondary Organic Aerosols at Mt. Huang, East China." Molecules 28, no. 16 (2023): 5939. http://dx.doi.org/10.3390/molecules28165939.

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The molecular characteristics and formation mechanism of biogenic secondary organic aerosols (BSOAs) in the forested atmosphere are poorly known. Here, we report the temporal variations in and formation processes of BSOA tracers derived from isoprene, monoterpenes, and β caryophyllene in PM2.5 samples collected at the foot of Mt. Huang (483 m a. s. l) in East China during the summer of 2019 with a 3 h time resolution. The concentrations of nearly all of the detected species, including organic carbon (OC), elemental carbon (EC), levoglucosan, and SIA (sum of SO42−, NO3−, and NH4+), were higher

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14

ROGGE, W. F. "ORGANIC AEROSOL TRACERS FOR SOURCE-RECEPTOR RECONCILIATION." Journal of Aerosol Science 32 (September 2001): 329–30. http://dx.doi.org/10.1016/s0021-8502(21)00155-5.

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15

Simoneit, Bernd R. T., and M. A. Mazurek. "Organic Tracers in Ambient Aerosols and Rain." Aerosol Science and Technology 10, no. 2 (1989): 267–91. http://dx.doi.org/10.1080/02786828908959264.

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16

Serène, Leïla, Christelle Batiot-Guilhe, Naomi Mazzilli, et al. "Transit Time index (TTi) as an adaptation of the humification index to illustrate transit time differences in karst hydrosystems: application to the karst springs of the Fontaine de Vaucluse system (southeastern France)." Hydrology and Earth System Sciences 26, no. 19 (2022): 5035–49. http://dx.doi.org/10.5194/hess-26-5035-2022.

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Abstract. Transit time can be estimated thanks to natural tracers, but few of them are usable in the 0–6-month range. The main purpose of this work is to analyze the potential of the ratio of heavy- to light-weight organic compounds (the humification index (HIX); Ohno, 2002; Zsolnay et al., 1999) as a natural tracer of short transit time (Blondel et al., 2012). Critical analysis of former studies shows that although the link between HIX and transit time seems consistent, the whole methodological approach needs to be consolidated. Natural organic matter fluorescence from 289 groundwater samples

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17

Riedel, T. P., Y. H. Lin, Z. Zhang, et al. "Constraining condensed-phase formation kinetics of secondary organic aerosol components from isoprene epoxydiols." Atmospheric Chemistry and Physics Discussions 15, no. 20 (2015): 28289–316. http://dx.doi.org/10.5194/acpd-15-28289-2015.

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Abstract. Isomeric epoxydiols from isoprene photooxidation (IEPOX) have been shown to produce substantial amounts of secondary organic aerosol (SOA) mass and are therefore considered a major isoprene-derived SOA precursor. Heterogeneous reactions of IEPOX on atmospheric aerosols form various aerosol-phase components or "tracers" that contribute to the SOA mass burden. A limited number of the reaction rate constants for these acid-catalyzed aqueous-phase tracer formation reactions have been constrained through bulk laboratory measurements. We have designed a chemical box model with multiple exp

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18

Riedel, T. P., Y. H. Lin, Z. Zhang, et al. "Constraining condensed-phase formation kinetics of secondary organic aerosol components from isoprene epoxydiols." Atmospheric Chemistry and Physics 16, no. 3 (2016): 1245–54. http://dx.doi.org/10.5194/acp-16-1245-2016.

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Abstract. Isomeric epoxydiols from isoprene photooxidation (IEPOX) have been shown to produce substantial amounts of secondary organic aerosol (SOA) mass and are therefore considered a major isoprene-derived SOA precursor. Heterogeneous reactions of IEPOX on atmospheric aerosols form various aerosol-phase components or "tracers" that contribute to the SOA mass burden. A limited number of the reaction rate constants for these acid-catalyzed aqueous-phase tracer formation reactions have been constrained through bulk laboratory measurements. We have designed a chemical box model with multiple exp

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19

Nazari Samani, A., R. J. Wasson, and Arash Malekian. "Application of multiple sediment fingerprinting techniques to determine the sediment source contribution of gully erosion: Review and case study from Boushehr province, southwestern Iran." Progress in Physical Geography: Earth and Environment 35, no. 3 (2011): 375–91. http://dx.doi.org/10.1177/0309133311401643.

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Soil erosion by water is one of the most important causes of land degradation in arid and semi-arid regions. Quantitative determination of the relative contributions of sediment sources within catchments is an essential task before developing any appropriate management strategy in order to control soil erosion and sediment transport. In this paper a multi-parameter fingerprinting method is used to determine the sediment contribution of gully erosion (Scg) in three catchments in Iran, with different areas and drainage densities. Tracers including carbon, nitrogen, C/N, phosphorus and 137Cs whic

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20

Killoran, Michael P., Sergiy Levin, Michelle E. Boursier, et al. "An Integrated Approach toward NanoBRET Tracers for Analysis of GPCR Ligand Engagement." Molecules 26, no. 10 (2021): 2857. http://dx.doi.org/10.3390/molecules26102857.

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Gaining insight into the pharmacology of ligand engagement with G-protein coupled receptors (GPCRs) under biologically relevant conditions is vital to both drug discovery and basic research. NanoLuc-based bioluminescence resonance energy transfer (NanoBRET) monitoring competitive binding between fluorescent tracers and unmodified test compounds has emerged as a robust and sensitive method to quantify ligand engagement with specific GPCRs genetically fused to NanoLuc luciferase or the luminogenic HiBiT peptide. However, development of fluorescent tracers is often challenging and remains the pri

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21

Cheng, Yubo, Yiqiu Ma, and Di Hu. "Tracer-based source apportioning of atmospheric organic carbon and the influence of anthropogenic emissions on secondary organic aerosol formation in Hong Kong." Atmospheric Chemistry and Physics 21, no. 13 (2021): 10589–608. http://dx.doi.org/10.5194/acp-21-10589-2021.

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Abstract. Here we conducted comprehensive chemical characterization and source apportionment of 49 PM2.5 samples collected in Hong Kong. Besides the major aerosol constituents, 39 polar organic species, including 14 secondary organic aerosol (SOA) tracers of isoprene, monoterpenes, β-caryophyllene, and naphthalene, were quantified using gas chromatography–mass spectrometry (GC–MS). Six factors, i.e., SOA, secondary sulfate (SS), biomass burning (BB)/SOA, sea salt, marine vessels, and vehicle emissions, were apportioned by positive matrix factorization (PMF) as the major sources of ambient orga

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22

Fu, P. Q., K. Kawamura, P. Pochanart, H. Tanimoto, Y. Kanaya, and Z. F. Wang. "Summertime contributions of isoprene, monoterpenes, and sesquiterpene oxidation to the formation of secondary organic aerosol in the troposphere over Mt. Tai, Central East China during MTX2006." Atmospheric Chemistry and Physics Discussions 9, no. 4 (2009): 16941–72. http://dx.doi.org/10.5194/acpd-9-16941-2009.

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Abstract. To better understand the contribution of biogenic volatile organic compounds to the formation of secondary organic aerosol (SOA) in high mountain regions, ambient aerosols were collected at the summit of Mt. Tai (1534 m, a.s.l.), Central East China (CEC) during the Mount Tai eXperiment 2006 campaign (MTX2006) in early summer. Biogenic SOA tracers of isoprene, monoterpenes, and β-caryophyllene oxidation products were measured using gas chromatography/mass spectrometry. All the biogenic SOA tracers showed no clear diurnal variations, suggesting that they are formed during long-range at

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23

Bork, Marcus, Jens Lange, Markus Graf-Rosenfellner, and Friederike Lang. "Controls of fluorescent tracer retention by soils and sediments." Hydrology and Earth System Sciences 24, no. 2 (2020): 977–89. http://dx.doi.org/10.5194/hess-24-977-2020.

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Abstract. Fluorescent dyes like uranine (UR) and sulforhodamine B (SRB) have been used for decades as artificial tracers in hydrological studies. Recently, attempts have been made to trace organic pollutants in soil with such dyes, but the knowledge of the controls of sorption of UR and SRB in soils is still incomplete and poorly standardised. For this reason, we selectively controlled clay, organic matter (OM) and pH within batch experiments and quantified systematically the impact and possible interactions of these controls on the adsorption of UR and SRB. Sorption isotherms were determined

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24

Haque, Md Mozammel, Yanlin Zhang, Srinivas Bikkina, Meehye Lee, and Kimitaka Kawamura. "Regional heterogeneities in the emission of airborne primary sugar compounds and biogenic secondary organic aerosols in the East Asian outflow: evidence for coal combustion as a source of levoglucosan." Atmospheric Chemistry and Physics 22, no. 2 (2022): 1373–93. http://dx.doi.org/10.5194/acp-22-1373-2022.

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Abstract. Biomass burning (BB) significantly influences the chemical composition of organic aerosols (OAs) in the East Asian outflow. The source apportionment of BB-derived OA is an influential factor for understanding their regional emissions, which is crucial for reducing uncertainties in their projected climate and health effects. We analyzed here three different classes of atmospheric sugar compounds (anhydrosugars, primary sugars, and sugar alcohols) and two types of biogenic secondary organic aerosol (BSOA) tracers (isoprene- and monoterpene-derived SOA products) from a year-long study t

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25

Cass, Glen R. "Organic molecular tracers for particulate air pollution sources." TrAC Trends in Analytical Chemistry 17, no. 6 (1998): 356–66. http://dx.doi.org/10.1016/s0165-9936(98)00040-5.

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26

Lytle, Thomas F., and Julia S. Lytle. "Lignin residues as tracers of organic waste transport." Chemosphere 16, no. 1 (1987): 171–82. http://dx.doi.org/10.1016/0045-6535(87)90122-6.

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27

Zhang, Yu-Qing, Duo-Hong Chen, Xiang Ding, et al. "Impact of anthropogenic emissions on biogenic secondary organic aerosol: observation in the Pearl River Delta, southern China." Atmospheric Chemistry and Physics 19, no. 22 (2019): 14403–15. http://dx.doi.org/10.5194/acp-19-14403-2019.

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Abstract. Secondary organic aerosol (SOA) formation from biogenic precursors is affected by anthropogenic emissions, which are not well understood in polluted areas. In this study, we accomplished a year-round campaign at nine sites in polluted areas located in the Pearl River Delta (PRD) region during 2015. We measured typical biogenic SOA (BSOA) tracers from isoprene, monoterpenes, and β-caryophyllene, as well as major gaseous and particulate pollutants and investigated the impact of anthropogenic pollutants on BSOA formation. The concentrations of BSOA tracers were in the range of 45.4 to 1

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28

Al-Naiema, Ibrahim M., and Elizabeth A. Stone. "Evaluation of anthropogenic secondary organic aerosol tracers from aromatic hydrocarbons." Atmospheric Chemistry and Physics 17, no. 3 (2017): 2053–65. http://dx.doi.org/10.5194/acp-17-2053-2017.

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Abstract. Products of secondary organic aerosol (SOA) from aromatic volatile organic compounds (VOCs) – 2,3-dihydroxy-4-oxopentanoic acid, dicarboxylic acids, nitromonoaromatics, and furandiones – were evaluated for their potential to serve as anthropogenic SOA tracers with respect to their (1) ambient concentrations and detectability in PM2.5 in Iowa City, IA, USA; (2) gas–particle partitioning behaviour; and (3) source specificity by way of correlations with primary and secondary source tracers and literature review. A widely used tracer for toluene-derived SOA, 2,3-dihydroxy-4-oxopentanoic

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Yu, Qing, Jing Chen, Weihua Qin, et al. "Characteristics, primary sources and secondary formation of water-soluble organic aerosols in downtown Beijing." Atmospheric Chemistry and Physics 21, no. 3 (2021): 1775–96. http://dx.doi.org/10.5194/acp-21-1775-2021.

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Abstract. Water-soluble organic carbon (WSOC) accounts for a large proportion of aerosols and plays a critical role in various atmospheric chemical processes. In order to investigate the primary sources and secondary production of WSOC in downtown Beijing, day and night fine particulate matter (PM2.5) samples in January (winter), April (spring), July (summer) and October (autumn) 2017 were collected and analyzed for WSOC and organic tracers in this study. WSOC was dominated by its moderately hydrophilic fraction and showed the highest concentration in January and comparable levels in April, Ju

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Fu, P. Q., K. Kawamura, Y. F. Cheng, et al. "Aircraft measurements of polar organic tracer compounds in tropospheric particles (PM<sub>10</sub>) over central China." Atmospheric Chemistry and Physics 14, no. 8 (2014): 4185–99. http://dx.doi.org/10.5194/acp-14-4185-2014.

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Abstract. Atmospheric aerosol samples were collected by aircraft at low to middle altitudes (0.8–3.5 km a.g.l.) over central East to West China during summer 2003 and spring 2004. The samples were analyzed for polar organic compounds using a technique of solvent extraction/BSTFA derivatization/gas chromatography–mass spectrometry. Biogenic secondary organic aerosol (SOA) tracers from the oxidation of isoprene were found to be more abundant in summer (3.3–138 ng m−3, mean 39 ng m−3) than in spring (3.2–42 ng m−3, 15 ng m−3), while α/β-pinene and β-caryophyllene SOA tracers showed similar abunda

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Kriest, I., and A. Oschlies. "Swept under the carpet: the effect of organic matter burial in global biogeochemical ocean models." Biogeosciences Discussions 10, no. 7 (2013): 10859–911. http://dx.doi.org/10.5194/bgd-10-10859-2013.

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Abstract. Although of substantial importance for marine tracer distributions and eventually global carbon, oxygen, and nitrogen fluxes, the interaction between sinking and remineralization of organic matter, benthic fluxes and burial is not always represented consistently in global biogeochemical models. We here aim to investigate the relationships between these processes with a suite of global biogeochemical models, each simulated over millennia, and compared against observed distributions of pelagic tracers and benthic and pelagic fluxes. We concentrate on the representation of sediment-wate

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Alstrup, Aage Kristian Olsen, Svend Borup Jensen, Ole Lerberg Nielsen, Lars Jødal, and Pia Afzelius. "Preclinical Testing of Radiopharmaceuticals for the Detection and Characterization of Osteomyelitis: Experiences from a Porcine Model." Molecules 26, no. 14 (2021): 4221. http://dx.doi.org/10.3390/molecules26144221.

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The development of new and better radioactive tracers capable of detecting and characterizing osteomyelitis is an ongoing process, mainly because available tracers lack selectivity towards osteomyelitis. An integrated part of developing new tracers is the performance of in vivo tests using appropriate animal models. The available animal models for osteomyelitis are also far from ideal. Therefore, developing improved animal osteomyelitis models is as important as developing new radioactive tracers. We recently published a review on radioactive tracers. In this review, we only present and discus

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Kriest, I., and A. Oschlies. "Swept under the carpet: organic matter burial decreases global ocean biogeochemical model sensitivity to remineralization length scale." Biogeosciences 10, no. 12 (2013): 8401–22. http://dx.doi.org/10.5194/bg-10-8401-2013.

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Abstract. Although of substantial importance for marine tracer distributions and eventually global carbon, oxygen, and nitrogen fluxes, the interaction between sinking and remineralization of organic matter, benthic fluxes and burial is not always represented consistently in global biogeochemical models. We here aim to investigate the relationships between these processes with a suite of global biogeochemical models, each simulated over millennia, and compared against observed distributions of pelagic tracers and benthic and pelagic fluxes. We concentrate on the representation of sediment–wate

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34

Afzelius, Pia, Aage Alstrup, Ole Nielsen, Karin Nielsen, and Svend Jensen. "Attempts to Target Staphylococcus aureus Induced Osteomyelitis Bone Lesions in a Juvenile Pig Model by Using Radiotracers." Molecules 25, no. 18 (2020): 4329. http://dx.doi.org/10.3390/molecules25184329.

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Background [18F]FDG Positron Emission Tomography cannot differentiate between sterile inflammation and infection. Therefore, we, aimed to develop more specific radiotracers fitted for differentiation between sterile and septic infection to improve the diagnostic accuracy. Consequently, the clinicians can refine the treatment of, for example, prosthesis-related infection. Methods: We examined different target points; Staphylococcus aureus biofilm (68Ga-labeled DOTA-K-A9 and DOTA-GSGK-A11), bone remodeling ([18F]NaF), bacterial cell membranes ([68Ga]Ga-Ubiquicidin), and leukocyte trafficking ([6

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Fu, P. Q., K. Kawamura, Y. F. Cheng, et al. "Aircraft measurements of polar organic tracer compounds in tropospheric particles (PM<sub>10</sub>) over Central China." Atmospheric Chemistry and Physics Discussions 13, no. 9 (2013): 24481–516. http://dx.doi.org/10.5194/acpd-13-24481-2013.

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Abstract. Atmospheric aerosol samples were collected by aircraft at low to middle altitudes (0.8–3.5 km a.g.l.) over Central East to West China during summer 2003 and spring 2004. The samples were analyzed for polar organic compounds using a technique of solvent extraction/BSTFA derivatization/gas chromatography-mass spectrometry. Biogenic secondary organic aerosol (SOA) tracers from the oxidation of isoprene were found to be more abundant in summer (3.3–138 ng m−3, mean 39 ng m−3) than in spring (3.2–42 ng m−3, 15 ng m−3), while α/β-pinene and β-caryophyllene SOA tracers showed similar abunda

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Vasziné Szabó, Enikő, Katalin Köves, and Ágnes Csáki. "Fluorescent Molecules That Help Reveal Previously Unidentified Neural Connections in Adult, Neonatal and Peripubertal Mammals." International Journal of Molecular Sciences 24, no. 19 (2023): 14478. http://dx.doi.org/10.3390/ijms241914478.

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One hundred and twenty-five years ago there was a lively discussion between Hungarian and Spanish neuroscientists on the nature of neural connections. The question was whether the neurofibrils run from one neuron to the next and connect neurons as a continuous network or the fibrils form an internal skeleton in the neurons and do not leave the cell; however, there is close contact between the neurons. About 50 years later, the invention of the electron microscope solved the problem. Close contacts between individual neurons were identified and named as synapses. In the following years, the nee

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Budisulistiorini, S. H., X. Li, S. T. Bairai, et al. "Examining the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol formation during the 2013 Southern Oxidant and Aerosol Study (SOAS) at the Look Rock, Tennessee ground site." Atmospheric Chemistry and Physics 15, no. 15 (2015): 8871–88. http://dx.doi.org/10.5194/acp-15-8871-2015.

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Abstract. A suite of offline and real-time gas- and particle-phase measurements was deployed at Look Rock, Tennessee (TN), during the 2013 Southern Oxidant and Aerosol Study (SOAS) to examine the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol (SOA) formation. High- and low-time-resolution PM2.5 samples were collected for analysis of known tracer compounds in isoprene-derived SOA by gas chromatography/electron ionization-mass spectrometry (GC/EI-MS) and ultra performance liquid chromatography/diode array detection-electrospray ionization-high-resolution quadrup

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Deshmukh, Dhananjay Kumar, M. Mozammel Haque, Yongwon Kim, and Kimitaka Kawamura. "Organic tracers of fine aerosol particles in central Alaska: summertime composition and sources." Atmospheric Chemistry and Physics 19, no. 22 (2019): 14009–29. http://dx.doi.org/10.5194/acp-19-14009-2019.

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Abstract. PM2.5 aerosols were collected at Fairbanks (64.51∘ N and 147.51∘ W) in central Alaska during the summer of 2009 and analyzed for organic tracer compounds using a gas chromatograph–mass spectrometer. The organic compounds were grouped into 14 classes based on their functional groups and sources. Concentrations of the total organics measured ranged from 113 to 1664 ng m−3 (avg 535 ng m−3). Anhydrosugars (avg 186 ng m−3) and n-alkanoic acids (avg 185 ng m−3) were 2 major classes among the 14 compound classes. The similar temporal trends and strong positive correlations among anhydrosuga

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Simoneit, Bernd R. T., and V. O. Elias. "Detecting Organic Tracers from Biomass Burning in the Atmosphere." Marine Pollution Bulletin 42, no. 10 (2001): 805–10. http://dx.doi.org/10.1016/s0025-326x(01)00094-7.

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Hong, Youwei, Xinbei Xu, Dan Liao, et al. "Measurement report: Effects of anthropogenic emissions and environmental factors on the formation of biogenic secondary organic aerosol (BSOA) in a coastal city of southeastern China." Atmospheric Chemistry and Physics 22, no. 11 (2022): 7827–41. http://dx.doi.org/10.5194/acp-22-7827-2022.

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Abstract. To better understand the formation of biogenic secondary organic aerosol (BSOA), aerosol samples with a 4 h time resolution were collected during summer and winter in the southeast of China, along with online measurements of trace gases, aerosol chemical compositions, and meteorological parameters. The samples were analyzed by gas chromatography–mass spectrometry for PM2.5-bound secondary organic aerosol (SOA) tracers, including isoprene (SOAI), α/β-pinene (SOAM), β-caryophyllene (SOAC), and toluene (ASOA). The average concentrations of total SOA tracers in winter and summer were 38.

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Hu, Di, and Jian Zhen Yu. "Secondary organic aerosol tracers and malic acid in Hong Kong: seasonal trends and origins." Environmental Chemistry 10, no. 5 (2013): 381. http://dx.doi.org/10.1071/en13104.

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Environmental context Secondary organic aerosols (SOAs), a major organic component of ambient fine particles, contribute to adverse health effects and visibility degradation. Quantification of SOA tracers allows estimation of contributions from specific precursors, which helps the formulation of effective control strategies. We found that malic acid was present in SOA at high abundance in both winter and summer; its seasonally distinct inter-species relationships offer insights into distinct SOA formation pathways. Abstract Fine particle samples collected at an urban location in Hong Kong duri

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Novy, Zbynek, Jana Stepankova, Michaela Hola, Dominika Flasarova, Miroslav Popper, and Milos Petrik. "Preclinical Evaluation of Radiolabeled Peptides for PET Imaging of Glioblastoma Multiforme." Molecules 24, no. 13 (2019): 2496. http://dx.doi.org/10.3390/molecules24132496.

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In this study, we have compared four 68Ga-labeled peptides (three Arg-Gly-Asp (RGD) peptides and substance-P) with two 18F-tracers clinically approved for tumor imaging. We have studied in vitro and in vivo characteristics of selected radiolabeled tracers in a glioblastoma multiforme tumor model. The in vitro part of the study was mainly focused on the evaluation of radiotracers stability under various conditions. We have also determined in vivo stability of studied 68Ga-radiotracers by analysis of murine urine collected at various time points after injection. The in vivo behavior of tested 68

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Stone, Elizabeth A., Tony T. Nguyen, Bidya Banmali Pradhan, and Pradeep Man Dangol. "Assessment of biogenic secondary organic aerosol in the Himalayas." Environmental Chemistry 9, no. 3 (2012): 263. http://dx.doi.org/10.1071/en12002.

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Environmental contextSecondary organic aerosols derived from biogenic gases are ubiquitous in the atmosphere. We found that biogenic secondary organic aerosol in Nepal accounted for 6 to 23 % of organic carbon. Primary and secondary biogenic sources combined accounted for approximately half of the observed organic aerosol, suggesting that additional aerosol sources or precursors are significant in this region of the Himalayas. AbstractBiogenic contributions to secondary organic aerosol (SOA) in the South-East Asian regional haze were assessed by measurement of isoprene, monoterpene and sesquit

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Kriest, Iris, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies. "Exploring the role of different data types and timescales in the quality of marine biogeochemical model calibration." Biogeosciences 20, no. 13 (2023): 2645–69. http://dx.doi.org/10.5194/bg-20-2645-2023.

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Abstract. Global biogeochemical ocean models help to investigate the present and potential future state of the ocean, its productivity and cascading effects on higher trophic levels such as fish. They are often subjectively tuned against data sets of inorganic tracers and surface chlorophyll and only very rarely against organic components such as particulate organic carbon or zooplankton. The resulting uncertainty in biogeochemical model parameters (and parameterisations) associated with these components can explain some of the large spread of global model solutions with regard to the cycling

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Hirave, Pranav, Guido L. B. Wiesenberg, Axel Birkholz, and Christine Alewell. "Understanding the effects of early degradation on isotopic tracers: implications for sediment source attribution using compound-specific isotope analysis (CSIA)." Biogeosciences 17, no. 8 (2020): 2169–80. http://dx.doi.org/10.5194/bg-17-2169-2020.

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Abstract. Application of compound-specific isotope analysis (CSIA) in sediment fingerprinting source apportionment studies is becoming more frequent, as it can potentially provide robust land-use-based source attribution of suspended sediments in freshwater and marine systems. Isotopic tracers such as δ13C values of vegetation-derived organic compounds are considered to be suitable for the CSIA-based fingerprinting method. However, a rigorous evaluation of tracer conservativeness in terms of the stability of isotopic signature during detachment and transport of soil during erosion is essential

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Yasmeen, Farhat, Reinhilde Vermeylen, Nicolas Maurin, Emilie Perraudin, Jean-François Doussin та Magda Claeys. "Characterisation of tracers for aging of α-pinene secondary organic aerosol using liquid chromatography/negative ion electrospray ionisation mass spectrometry". Environmental Chemistry 9, № 3 (2012): 236. http://dx.doi.org/10.1071/en11148.

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Environmental contextAmbient fine aerosol from forested sites contains secondary organic aerosol from the oxidation of monoterpenes that are emitted by the vegetation, mainly by conifers. These biogenic aerosols can have varying lifetimes in the atmosphere because they contain first-generation oxidation products of α-pinene as well as aged products formed through further photooxidation, fragmentation, hydrolysis, and dimerisation reactions. We focus on the structural characterisation of secondary organic aerosol products that are simulated in a smog chamber experiment and can serve as potentia

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Galeron, M. A., F. Vaultier та J. F. Rontani. "Oxidation products of α- and β-amyrins: potential tracers of abiotic degradation of vascular-plant organic matter in aquatic environments". Environmental Chemistry 13, № 4 (2016): 732. http://dx.doi.org/10.1071/en15237.

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Environmental contextHow can we know what happens to organic matter in aquatic environments? Although several compounds exist that can be used to trace the origin and state of organic matter, not many are sufficiently stable and specific to trace degradation processes, but α- and β-amyrins can fulfil that role. Such knowledge will help us better understand and better quantify carbon fluxes in riverine and marine environments. AbstractIn order to fulfil the current need for stable and specific tracers to monitor vascular-plant organic matter degradation in aquatic environments, α-amyrin (urs-12

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Budisulistiorini, S. H., X. Li, S. T. Bairai, et al. "Examining the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol formation during the 2013 Southern Oxidant and Aerosol Study (SOAS) at the Look Rock, Tennessee, ground site." Atmospheric Chemistry and Physics Discussions 15, no. 5 (2015): 7365–417. http://dx.doi.org/10.5194/acpd-15-7365-2015.

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Abstract. A suite of offline and real-time gas- and particle-phase measurements was deployed at Look Rock, Tennessee (TN), during the 2013 Southern Oxidant and Aerosol Study (SOAS) to examine the effects of anthropogenic emissions on isoprene-derived secondary organic aerosol (SOA) formation. High- and low-time resolution PM2.5 samples were collected for analysis of known tracer compounds in isoprene-derived SOA by gas chromatography/electron ionization-mass spectrometry (GC/EI-MS) and ultra performance liquid chromatography/diode array detection-electrospray ionization-high-resolution quadrup

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Easteal, Allan J. "Tracer diffusion in aqueous sucrose and urea solutions." Canadian Journal of Chemistry 68, no. 9 (1990): 1611–15. http://dx.doi.org/10.1139/v90-248.

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Tracer diffusion coefficients for water (as HTO), methanol (14CH3OH), and acetonitrile (CT3CN) in aqueous sucrose (10–25% w/w) and urea (0.25–4 mol L−1) solutions at 298 K have been determined using the diaphragm cell technique. For sucrose solutions tracer diffusion coefficients vary with the 2/3 power of the relative viscosity and the viscosity dependence is the same for the above tracers as for sucrose and oxygen. In urea solutions tracer diffusion coefficients appear to have a solute-specific viscosity dependence, but the solute specificity is largely removed when the effects of proton exc

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Shen, Xing, Jiahong Chen, Shuwei Lv, et al. "Fluorescence Polarization Immunoassay for Determination of Enrofloxacin in Pork Liver and Chicken." Molecules 24, no. 24 (2019): 4462. http://dx.doi.org/10.3390/molecules24244462.

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Enrofloxacin (ENR) is a widely used fluoroquinolone (FQ) antibiotic for antibacterial treatment of edible animal. In this study, a rapid and highly specific fluorescence polarization immunoassay (FPIA) was developed for monitoring ENR residues in animal foods. First, ENR was covalently coupled to bovine serum albumin (BSA) to produce specific polyclonal antibodies (pAbs). Three fluorescein-labeled ENR tracers (A, B, and C) with different spacers were synthesized and compared to obtain higher sensitivity. Tracer C with the longest arm showed the best sensitivity among the three tracers. The dev

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