Showing 201 - 220 results of 847 for search '"aromaticity"', query time: 0.07s Refine Results
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  3. 203

    Molecular Signatures of Humic Acids from Different Sources as Revealed by Ultrahigh Resolution Mass Spectrometry by Shuai Qin, Chengbin Xu, Yingzi Xu, Yingchen Bai, Fei Guo

    Published 2020-01-01
    “…Regardless of the source of HA, compounds containing more heteroatoms (such as nitrogen and sulfur) have a higher degree of unsaturation and aromaticity. JFHA, SRHA, and LEHA from soil, river, and leonardite, respectively, are arranged in order from the lowest to highest degree of humification, according to molecular unsaturation and aromaticity of HAs. …”
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  4. 204
  5. 205

    Linnett Double Quartet Theory, Challenging the Pairing Electrons by Yeganeh Khaniani, Alireza Badiei

    Published 2009-01-01
    “…Linnett's double quartet theory could solved some important problems about stability of radicals, paramagnetism / diamagnetism in molecular systems, electronic structure in transition states and finally challenge of resonance and aromaticity. In this article we review some basic ideas and concepts concerning different models and then we give a detailed discussion of the LDQ and use it in diverse branches of chemistry.…”
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  6. 206

    Contrasting seasonal patterns in particle aggregation and dissolved organic matter transformation in a sub-Arctic fjord by M. G. Digernes, Y. V. Bodur, M. Amargant-Arumí, O. Müller, J. A. Hawkes, S. G. Kohler, U. Dietrich, M. Reigstad, M. L. Paulsen

    Published 2025-01-01
    “…Simultaneously, the DOM pool became more labile during the incubation period, as indicated by changes in the average hydrogen saturation, aromaticity, and oxygen saturation, with implications for carbon cycling. …”
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  7. 207

    Koopmans' Analysis of Chemical Hardness with Spectral-Like Resolution by Mihai V. Putz

    Published 2013-01-01
    “…Three approximation levels of Koopmans' theorem are explored and applied: the first referring to the inner quantum behavior of the orbitalic energies that depart from the genuine ones in Fock space when the wave-functions' Hilbert-Banach basis set is specified to solve the many-electronic spectra of spin-orbitals' eigenstates; it is the most subtle issue regarding Koopmans' theorem as it brings many critics and refutation in the last decades, yet it is shown here as an irrefutable “observational” effect through computation, specific to any in silico spectra of an eigenproblem; the second level assumes the “frozen spin-orbitals” approximation during the extracting or adding of electrons to the frontier of the chemical system through the ionization and affinity processes, respectively; this approximation is nevertheless workable for great deal of chemical compounds, especially organic systems, and is justified for chemical reactivity and aromaticity hierarchies in an homologue series; the third and the most severe approximation regards the extension of the second one to superior orders of ionization and affinities, here studied at the level of chemical hardness compact-finite expressions up to spectral-like resolution for a paradigmatic set of aromatic carbohydrates.…”
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  8. 208

    Degree-Based Entropy for a Non-Kekulean Benzenoid Graph by Md. Ashraful Alam, Muhammad Usman Ghani, Muhammad Kamran, Muhammad Shazib Hameed, Riaz Hussain Khan, A. Q. Baig

    Published 2022-01-01
    “…Tessellations of kekulenes and cycloarenes have a lot of potential as nanomolecular belts for trapping and transporting heavy metal ions and chloride ions because they have the best electronic properties and pore sizes. The aromaticity, superaromaticity, chirality, and novel electrical and magnetic properties of a class of cycloarenes known as kekulenes have been the subject of several experimental and theoretical studies. …”
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  9. 209

    Impact of tectonic deformation on coal methane adsorption capacity by Wu Li, Bo Jiang, Yan-Ming Zhu

    Published 2019-12-01
    “…At a pressure of 12 MPa, primary coal (N32) showed Langmuir volume (V L ) values of 15.38, 9.58, and 7.86 cm 3 /g and Langmuir pressure (P L ) values of 3.82, 2.07, and 1.81 MPa at temperatures of 30°C, 50°C, and 70°C, respectively. (3) The Langmuir volume appears to have a linear relationship with parameters I D1 /I G , Al/OX, and A-factor, as well as a parabolic curve relationship with f a , thereby illustrating that increases of apparent aromaticity can raise CH 4 adsorption on coal.…”
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  10. 210

    Humus and Humic Acids of Luvisol and Cambisol of Jiguli Ridges, Samara Region, Russia by Evgeny Abakumov, Nobihudu Fujitake, Takashi Kosaki

    Published 2009-01-01
    “…These HAs of different soils are different in elemental composition (C and N are higher in Cambisols, O is higher in Luvisols), carbon species according to 13-C NMR (aromaticity is higher in Luvisols, while the aliphatic, carbonylic and carboxylic compounds are higher in Cambisols). …”
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  11. 211

    Structural Analysis of Humic Acid in Soil at Different Corn Straw Returning Modes through Fluorescence Spectroscopy and Infrared Spectroscopy by JinFeng Gao, Sen Dou, ZhiGuo Wang

    Published 2019-01-01
    “…Among the four straw returning modes, Ss is the most beneficial for reducing the oxidation degree and increasing the aromatization and humification degree of subsoil HA. …”
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  12. 212

    Electronic structure of mesoionic compounds. The classification problem by Mariia Kyrpa, Sergiy Kovalenko, Volodymyr Ivanov

    Published 2024-06-01
    “…At the same time, based on NICS calculations we concluded that both classes are not characterized by pronounced aromaticity of the mesoionic ring for the selected set of molecules.…”
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  13. 213

    On the Adsorption Kinetics and Equilibrium of Polyaromatic Hydrocarbons from Aqueous Solution by Marta Haro, Belén Cabal, José B. Parra, Conchi O. Ania

    Published 2011-06-01
    “…The purpose of the present work was to explore the removal of three polycyclic aromatic hydrocarbons (naphthalene, fluorene and acenaphtene) (PAHs) from aqueous solution onto an activated carbon. …”
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  14. 214

    New fruit waste-derived activated carbons of high adsorption performance towards metal, metalloid, and polymer species in multicomponent systems by Sylwia Kukowska, Piotr Nowicki, Katarzyna Szewczuk-Karpisz

    Published 2025-01-01
    “…Direct biomass activation led to higher microporosity compared to indirect (two-stage) one, whilst CO2-consuming activation increased aromaticity and hydrophobicity of the solids. In the two-component systems, polymers could favour metal/metalloid adsorption based on complexation phenomena. …”
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  15. 215

    Linking machine learning and biophysical structural features in drug discovery by Armin Ahmadi, Shivangi Gupta, Vineetha Menon, Jerome Baudry

    Published 2025-01-01
    “…This novel approach integrates biophysical insights with machine learning, focusing on pharmacophoric properties such as charge, hydrogen bonding, hydrophobicity, and aromaticity.ResultsResults showed significant enrichment of true positive ligands—improving database enrichment by up to 54-fold compared to random selection—demonstrating the robustness of this approach across diverse proteins.ConclusionUnlike conventional structure-based or ligand-based screening methods, this work emphasizes the role of specific protein conformations in driving ligand binding, making the process highly interpretable and actionable for drug discovery. …”
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  16. 216

    Comparison of Three Solid Phase Materials for the Extraction of Carboxylic Acids from River Water Followed by 2D GC × GC-TOFMS Determination by G. O. Bosire, J. C. Ngila, H. Parshotam

    Published 2016-01-01
    “…The extraction and determination of aliphatic and aromatic carboxylic acids as well as their influence on the aromaticity and molecularity relationship of natural organic matter (NOM) in water are reported in this study. …”
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  17. 217

    PHYSICOCHEMICAL PROPERTIES OF CULMS IN RYE (SECALE CEREALE L.) WITH A BRITTLE STEM by A. A. Konovalov, I. K. Shundrina, E. V. Karpova, V. I. Mamatyuk

    Published 2014-12-01
    “…The normal and fragile culms differed in the content of aromatic lignin monomers and the ratio of various types of chemical bonds.At equal thicknesses, the normal and mutant rye plants differed in the modulus of elasticity and proportional limit. …”
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  18. 218

    Obtaining commercial humic products from uncomposted manures: previous acid hydrolysis to enhance yields by Carla Bellera, Issa Abaalkheel, Pere Rovira, Jamal Alrefai

    Published 2024-02-01
    “…Acid hydrolysis enhances some optical indicators of humification (E4E6, aromaticity, EBTZ ratio) in the KOH extract. Nevertheless, because increasing acid concentration enhances carbohydrate extraction but decreases that of compounds other than carbohydrates, the overall result may be a drop in the proportion of humic fractions in the whole extracted matter (acid hydrolysate ? …”
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  19. 219

    Unique Genotypic Differences Discovered among Indigenous Bangladeshi Rice Landraces by Nusrat Yesmin, Sabrina M. Elias, Md. Sazzadur Rahman, Taslima Haque, A. K. M. Mahbub Hasan, Zeba I. Seraj

    Published 2014-01-01
    “…In some cases, the clustering matched with properties like aromaticity, stickiness, salt tolerance, and photoperiod insensitivity. …”
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  20. 220

    Valorizing Rice Straw and Its Anaerobically Digested Residues for Biochar to Remove Pb(II) from Aqueous Solution by Jinyang Li, Fei Shen, Gang Yang, Yanzong Zhang, Shihuai Deng, Jing Zhang, Yongmei Zeng, Tao Luo, Zili Mei

    Published 2018-01-01
    “…Overall, pH, electrical conductivity (EC), ash, specific surface area (SA), micronutrient content, and aromaticity of RS biochars (RSBCs) and DRS biochars (DRSBCs) increased with the promoted pyrolysis temperature, and opposite trends were found on the yield, volatile matter, H, N, and O. …”
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