Article
Chemistry, Inorganic & Nuclear
Leila Miladi, Abderrazek Oueslati, Samia Nasr, Houcine Naili
Summary: Li+ ion-conducting properties in Lithium magnesium orthophosphate compound were investigated in this study. The compound was synthesized using the standard ceramic method. Vibrational study, impedance spectroscopy, and SEM analysis were conducted to understand the ion dynamics, dielectric properties, and surface morphology. The synthesized material exhibited well crystallized orthorhombic olivine structure with the Pnma space group. Complex impedance spectra analysis showed that the electrical properties of the material depended heavily on frequency and temperature, indicating a relaxation phenomenon and semiconductor-type behavior. A universal dielectric response was observed in the frequency-dependent conductivity at different temperatures. The alternative current conductivity was discussed using Jonscher's model, while the transport properties in the dynamic region were investigated through the Correlated Barrier Hopping CBH conduction process. Cationic disorder played a major role in charge carriers transport, and fitting parameters obtained from the theoretical aspect were discussed.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Analytical
Zhen Pan, Xiaozhan Nong, Yajing Xie, Yan Li, Hui Zeng, Ying Liang, Min Zhang
Summary: In this study, a low-cost and rapid method for analyzing low-concentration phosphate in water was proposed. A hand-powered paper centrifuge was used for sample preconcentration and preparation, and digital image colorimetric sensing was employed for phosphate concentration analysis. The results of this method were in agreement with the traditional PMB method.
JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY
(2022)
Article
Chemistry, Analytical
Wanqin Yu, Jingwen Jia, Jinmei Shi, Hongmei Shi, Lixin Yang
Summary: A magnetic graphene oxide (GO/Fe3O4) nanocomposite was synthesized for magnetic solid-phase extraction (MSPE) of nitroimidazoles (NDZs) and their three major metabolites in honey samples. The optimized method exhibited low detection and quantitation limits, good linearity, and high recovery rates. The preparation of GO/Fe3O4 and the extraction process were convenient, rapid, and environmentally friendly.
Article
Environmental Sciences
Aman Grover, Irshad Mohiuddin, Ashok Kumar Malik, Jatinder Singh Aulakh, Deepak Kukkar, Ki-Hyun Kim
Summary: The study focused on developing an efficient method for screening parabens using CS-Ni/Fe-LDH composites. The composites demonstrated a wide linear range, good linearity, precision, high recovery, and reproducibility, offering a promising approach for paraben analysis.
Article
Biochemistry & Molecular Biology
Manickam Rajkumar, Karuppaiya Vimala, Darwin Dasan Tamiliniyan, Ramasundaram Thangaraj, Ramakrishnan Jaganathan, Poomani Kumaradhas, Soundarapandian Kannan
Summary: This study successfully synthesized Ge/PVA/Mg(OH)(2) nanocomposites and demonstrated their good biocompatibility, ability to inhibit Aβ protein expression, and protect neuronal cells from damage. Animal experiments also showed that this nanocomposite has a protective effect on cognitive and synaptic impairments in an AD model. Therefore, Ge/PVA/Mg(OH)(2) nanocomposite may be a potential candidate for treating AD.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Inorganic & Nuclear
Yoshitaka Kasamatsu, Masahiro Nagase, Hidemi Ninomiya, Eisuke Watanabe, Yudai Shigekawa, Narumi Kondo, Koichi Takamiya, Tsutomu Ohtsuki, Naoya Shiohara, Atsushi Shinohara
Summary: New chemical studies on heavy elements involved investigating coprecipitation behaviors with samarium hydroxide for various elements, and recent experiments using multitracer from neutron-induced fission of U-235 provided new data for Sr, Ru, I, Pm, and Np. The results reinforce the idea that hydroxide precipitation properties of various elements can be qualitatively investigated through their coprecipitation behaviors.
APPLIED RADIATION AND ISOTOPES
(2022)
Article
Biochemical Research Methods
Montserrat Mancera-Arteu, Fernando Benavente, Victoria Sanz-Nebot, Estela Gimenez
Summary: In this study, different chromatographic sorbents were evaluated for the analysis of glycopeptides. The PBA sorbent showed the most promising results, leading to the development of a selective and sensitive preconcentration method for glycopeptides. The method was successfully applied to the analysis of recombinant human erythropoietin (rhEPO) and demonstrated improved results compared to previous methods.
JOURNAL OF PROTEOME RESEARCH
(2023)
Article
Chemistry, Analytical
Maria Vergara-Barberan, Ernesto Francisco Simo-Alfonso, Jose Manuel Herrero-Martinez, Fernando Benavente
Summary: An aptamer affinity sorbent was developed for clean-up, preconcentration, separation, and characterization of a food allergen protein. The sorbent, based on magnetic bead particles modified with an aptamer against the target protein concanavalin A, was packed in SPE microcartridges. The developed method showed good linearity, with a low limit of detection, satisfactory repeatability, and the ability to reuse the microcartridges.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Applied
Xiaoli Guo, Tingze Ren, Jianchun Ji, Yan Yang, Xin Di
Summary: A combination of QuEChERS and D-mu-SPE based on dissolvable LDH nanosheets has been established for preconcentration and enrichment of sulfonylurea herbicides in wolfberry samples. The method shows high precision, low limits of detection and quantitation, and acceptable recovery under optimized conditions.
Article
Biochemical Research Methods
Jirasak Gamonchuang, Rodjana Burakham
Summary: In this study, mixed iron hydroxides modified with different amino-based polymeric materials were investigated for the extraction of phenol compounds. Among them, polyphenylenediamine-modified mixed iron hydroxides showed high adsorption capability and ferromagnetic behavior suitable for magnetic solid-phase extraction. The developed method showed good stability and reliability in the analysis of a variety of phenol compounds in different samples.
JOURNAL OF CHROMATOGRAPHY A
(2021)
Review
Chemistry, Analytical
Petr Tuma
Summary: This review evaluates the progress made in the past decade in on-line, at-line, and in-line sample treatment coupled with capillary and microchip electrophoresis. The first part discusses various types of flow-gating interfaces (FGI) and their fabrication using materials like polydimethylsiloxane and commercially available fittings. The second part focuses on the coupling of electrophoresis with different extraction techniques, highlighting modern approaches such as supported liquid membrane extraction and microdialysis with high spatial and temporal resolution. The final section explores the design of sequential electrophoretic analyzers and the fabrication of SPE microcartridges with specialized sorbents. Applications of these techniques range from monitoring metabolites and proteins in living organisms to analyzing nutrients and waste compounds in food and wastewater.
ANALYTICA CHIMICA ACTA
(2023)
Article
Engineering, Chemical
M. L. Grasso, F. J. Castro, J. A. Gonzalez, F. C. Gennari
Summary: Li2CO3 was synthesized via solid-state reaction between beta-LiAlSi2O6 and NaOH at temperatures ranging from 300°C to 800°C, followed by washing and drying stages. The reaction mixture of beta-LiAlSi2O6:NaOH was mechanically milled for 1 hour prior to heating. The results showed that sodium replaces lithium in the aluminosilicate structure upon heating, resulting in the formation of NaAlSi2O6 and non-stoichiometric sodium aluminosilicates at different temperatures. Only Li2CO3 was obtained as a lithium-containing product at specific temperature conditions. Further experiments revealed that the 1:1 molar ratio of beta-LiAlSi2O6:NaOH yielded a significant amount of NaAlSi2O6. The recovery experiments showed a Li2CO3 content of 91.2 wt % in the solid residue.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Applied
Mohammad Reza Bayatloo, Niloofar Salehpour, Ali Alavi, Saeed Nojavan
Summary: In this study, fully green maltodextrin nanosponges (MDNSs) were introduced as extraction phases for the preparation of magnetic sorbents for the first time. The extraction performance of MDNSs in magnetic solid-phase extraction (MSPE) procedure was evaluated using fluoroquinolones as model analytes. Under optimized conditions, the developed MSPE-HPLC-UV method showed wide linearity and low limits of detection for the sensitive quantification of fluoroquinolones in water samples.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Analytical
Hiba Salim, Laura Pont, Estela Gimenez, Fernando Benavente
Summary: This study presents an online aptamer affinity solid-phase extraction direct mass spectrometry (AA-SPE-MS) method for the rapid purification, preconcentration, and characterization of alpha-synuclein (alpha-syn), a protein biomarker related to Parkinson's disease. The method utilizes SPE microcartridges and replaces the separation voltage with a pressure of 100 mbar to elute the protein towards the mass spectrometer. The developed method shows good repeatability, satisfactory linearity, and lower limits of detection compared to other techniques.
ANALYTICA CHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
Jirasak Gamonchuang, Rodjana Burakham
Summary: The research developed a magnetic solid phase extraction method for extracting bisphenol compounds, utilizing the Fe-Al MMH@TiO2-CTAB as the sorbent, enabling rapid and efficient separation and extraction of bisphenols.
Letter
Limnology
Thomas J. Browning, Xin Liu, Ruifeng Zhang, Zuozhu Wen, Jing Liu, Yaqian Zhou, Feipeng Xu, Yihua Cai, Kuanbo Zhou, Zhimian Cao, Yuanli Zhu, Dalin Shi, Eric P. Achterberg, Minhan Dai
Summary: Experimental results from the Philippine Sea indicate a gradient from nitrogen limitation in the north to nitrogen-iron co-limitation in the south, driving different phytoplankton growth responses. This large-scale phytoplankton response gradient is hypothesized to be climate sensitive and potentially important for regulating the distribution of predatory fish.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2022)
Article
Geochemistry & Geophysics
Zhongping Lee, Shaoling Shang, Yonghong Li, Kelly Luis, Minhan Dai, Yongchao Wang
Summary: The variation in light quality in the global ocean is quantified for the first time using the hue angle of downwelling irradiance, providing a new perspective on the three-dimensional changes in light quality. Global data highlights the distribution of light quality at different depths and its impact on the ratio of phytoplankton absorbed light. Emphasizing the importance of light quality on photosynthesis and oceanography.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Xiuli Yan, Jin-Yu Terence Yang, Min Nina Xu, Hongjie Wang, Minhan Dai, Shuh-Ji Kao
Summary: Information on the sources and transformations of particulate organic N (PN) and dissolved organic N (DON) at the coastal interface remains insufficient due to technological difficulties and complicated features of intensive physical mixing and rapid biological activities. The study investigated the spatial distribution of concentrations and isotopic compositions of PN and DON in the Changjiang plume during the summer flood period, revealing nonconservative DON behaviors and active transformations between the DON and PN pools.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jin-Yu Terence Yang, Ting-Chang Hsu, Ehui Tan, Kitack Lee, Michael D. Krom, Sijing Kang, Minhan Dai, Silver Sung-Yun Hsiao, Xiuli Yan, Wenbin Zou, Li Tian, Shuh-Ji Kao
Summary: Coastal oceans are increasingly suffering from eutrophication and hypoxia, which significantly affect the nitrogen cycle. This study found that estuarine surface sediments are the major source of N2O production, while nitrification and denitrification have a minimal contribution. Furthermore, the coupling of nitrification and denitrification at the sediment-water interface, under the presence of abundant organic matter, is the main driver of N2O release in this region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Zuozhu Wen, Thomas J. Browning, Yihua Cai, Rongbo Dai, Ruifeng Zhang, Chuanjun Du, Ruotong Jiang, Wenfang Lin, Xin Liu, Zhimian Cao, Haizheng Hong, Minhan Dai, Dalin Shi
Summary: Nitrogen fixation is vital for ocean productivity, but the exact mechanisms controlling this process are still unclear. This study shows that the supply ratio of iron:nitrogen is the most important factor in regulating N-2 fixation distribution in the tropical ocean.
Review
Astronomy & Astrophysics
Minhan Dai, Jianzhong Su, Yangyang Zhao, Eileen E. Hofmann, Zhimian Cao, Wei-Jun Cai, Jianping Gan, Fabrice Lacroix, Goulven G. Laruelle, Feifei Meng, Jens Daniel Mueller, Pierre A. G. Regnier, Guizhi Wang, Zhixuan Wang
Summary: This review examines the current understanding of the global coastal ocean carbon cycle and provides a new quantitative synthesis of air-sea CO2 exchange. The study highlights the importance of coastal and open ocean carbon sinks in mitigating climate change and meeting the target set by the Paris Agreement. The review also identifies challenges and knowledge gaps in projecting future changes in the coastal ocean carbon cycle.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
(2022)
Article
Oceanography
Jin-Yu Terence Yang, Jin-Ming Tang, Sijing Kang, Minhan Dai, Shuh-Ji Kao, Xiuli Yan, Min Nina Xu, Chuanjun Du
Summary: This study utilizes sedimentary N records in the South China Sea to reconstruct past changes in the oceanic nitrate inventory and provides insights into nitrate dynamics in the region. The findings suggest that the changes in nitrate isotopic ratios in the euphotic zone of the South China Sea are influenced by both nitrate assimilation and nitrification. In subsurface and thermocline waters, disproportional decreases in nitrate isotopes and elevated nitrate anomalies indicate the accumulation of external nitrogen. The study also reveals increased benthic denitrification at the western North Pacific Ocean margins, leading to consistent nitrate isotopic compositions but lower nitrate anomalies in the deep water of the South China Sea.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Xianhui S. S. Wan, Hua-Xia Sheng, Minhan Dai, Karen L. L. Casciotti, Matthew J. J. Church, Wenbin Zou, Li Liu, Hui Shen, Kuanbo Zhou, Bess B. B. Ward, Shuh-Ji Kao
Summary: The removal of carbon dioxide from the atmosphere by the marine biological pump is counteracted by the production of nitrous oxide in the subtropical ocean, which weakens the radiative benefit of carbon removal. Nitrous oxide production is promoted by enhanced biological activity, leading to substantial emissions that offset part of the greenhouse warming mitigation achieved by the biological pump.
Review
Geochemistry & Geophysics
Minhan Dai, Ya-Wei Luo, Eric P. Achterberg, Thomas J. Browning, Yihua Cai, Zhimian Cao, Fei Chai, Bingzhang Chen, Matthew J. Church, Dongjian Ci, Chuanjun Du, Kunshan Gao, Xianghui Guo, Zhendong Hu, Shuh-Ji Kao, Edward A. Laws, Zhongping Lee, Hongyang Lin, Qian Liu, Xin Liu, Weicheng Luo, Feifei Meng, Shaoling Shang, Dalin Shi, Hiroaki Saito, Luping Song, Xianhui Sean Wan, Yuntao Wang, Wei-Lei Wang, Zuozhu Wen, Peng Xiu, Jing Zhang, Ruifeng Zhang, Kuanbo Zhou
Summary: Subtropical gyres cover a significant portion of the world's ocean and are typically considered as ocean deserts due to their permanent stratification, depleted surface nutrients, and low biological productivity. Despite advancements in understanding biogeochemistry, subtropical gyres remain understudied. This review focuses on the North Pacific Subtropical Gyre and compares it with other subtropical gyres. It highlights the spatial variability and its impact on community structure and export production. The review also identifies knowledge gaps and research challenges in these unique systems that warrant future studies.
REVIEWS OF GEOPHYSICS
(2023)
Article
Limnology
Zhongwei Yuan, Thomas J. J. Browning, Ruifeng Zhang, Chengwang Wang, Chuanjun Du, Yanmin Wang, Ying Chen, Zhiyu Liu, Xin Liu, Dalin Shi, Minhan Dai
Summary: In nitrogen limited low latitude ocean regions, phosphate depletion can induce stress responses in marine microbes. This study associates a broad region of phosphate depletion in the subtropical North Pacific with different levels of phosphorus stress, and demonstrates the primary nitrogen limitation of the phytoplankton community with the relief provided by aerosol supply. Enhanced alkaline phosphatase activities indicate elevated phosphorus stress in northern sites with depleted phosphate. Increased aerosol deposition, likely stimulated by aerosol iron supply, can drive the regional enhancement in phosphate depletion through elevated nitrogen fixation. These findings are crucial for predicting future biogeochemical responses in the subtropical North Pacific to changes in aerosol supply.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Editorial Material
Multidisciplinary Sciences
Wei-Lei Wang, Mar Fernandez-Mendez, Franziska Elmer, Guang Gao, Yangyang Zhao, Yuye Han, Jiandong Li, Fei Chai, Minhan Dai
NATURE COMMUNICATIONS
(2023)
Article
Oceanography
Xianghui Guo, Jianzhong Su, Liguo Guo, Zhiqiang Liu, Wei Yang, Yan Li, Zhentong Yao, Lifang Wang, Minhan Dai
Summary: A field survey in the Pearl River estuary showed that upwelling-induced high DIC, low pH, and low DO values led to acidification and hypoxia. The observed phenomena contradicted the predicted consumption of DIC and over-saturation of DO. Hypoxia, acidification, and DIC accumulation were observed in the bottom waters. The ventilation under the influence of downwelling winds during the second survey reduced hypoxia but enhanced acidification.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Ecology
Yifan Ma, Kuanbo Zhou, Weifang Chen, Junhui Chen, Jin-Yu Terence Yang, Minhan Dai
Summary: In this study, samplings were conducted in the South China Sea to examine the nutrient-dependent structures of export productivity. The results showed that nitrate concentrations sharply increased with depth in the nutrient-replete layer. By estimating POC export fluxes, it was found that the NDL could rapidly export POC, challenging the traditional view that it would not be a net exporter of POC.
Article
Geosciences, Multidisciplinary
Zhixuan Wang, Guizhi Wang, Xianghui Guo, Yan Bai, Yi Xu, Minhan Dai
Summary: This study reconstructed the monthly sea surface pCO2 in the South China Sea (SCS) using a machine-learning-based method. The results show that while the SCS is overall a weak source of atmospheric CO2, the northern SCS acts as a sink, with the strength of the sink increasing over the past 2 decades. This research is significant for understanding carbon cycling and climate change in the SCS.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geochemistry & Geophysics
Zigeng Song, Shujie Yu, Yan Bai, Xianghui Guo, Xianqiang He, Weidong Zhai, Minhan Dai
Summary: The South China Sea is one of the largest marginal seas in the world, and estimating the air-sea CO2 flux in this region is challenging. In this study, a retrieval algorithm for sea surface pCO2 was developed using a combination of a mechanistic semianalytical method and machine learning. The algorithm was validated using independent cruise-based datasets and showed good accuracy and consistency.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
