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    187 results for search term: covid-9 in Published Dates: Last week

    Category: Catalysis
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    Working Paper
    , Title:

    Identifying Reactivity Differences of Two-Carbon-Atom-Based Legacy Refrigerants at Group 9 Metal Pincer Complexes

    , Authors: Luc Mauro, Isabelle Herlinger, Shane Hall, Russell Hughes, Roger Cramer, Lisa Fredin, David Vicic
    Version 1 posted 26 June 2025

    Extract found to contain search terms

    Interestingly, refrigerants R-134a and R-125 produced semi-stable and stable C-H activation products, respectively, at 80 °C, despite having alpha-fluorines that were susceptible to rapid eliminations in prior systems.9 , 10 In order to assess the stability of possible iridium hydrofluoroolefin complexes derived from R-134a and R-125 at higher temperatures, and to provide rapid access to a variety of iridium hydrofluoroolefin complexes that could result from conversions of the parent refrigerants, ligand substitution reactions with [(POCOP)Ir(NBE)] (14, NBE = norbornene) were explored (Scheme 2). Complex 14 was synthesized in an analogous fashion to the previously reported [(PCP)Ir(NBE)] complex described in Figure 1A,9
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    Category: Biological and Medicinal Chemistry
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    Working Paper
    , Title:

    Molecular Arms Race Classifier for Decrypting Venom Peptide and Ion Channel Interactions

    , Authors: Favour Achimba, Arezoo Bybordi, Mariam Gelashvili, Jessy Ramirez, Anita Raja, Weigang Qiu, Mande Holford
    Version 1 posted 30 June 2025

    Extract found to contain search terms

    Notably, most predicted potassium channel modulators (19 of 29) were classified with a distinct venom peptide cysteine framework, Framework 9
    0
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    Category: Analytical Chemistry
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    Working Paper
    , Title:

    Pathogen Recognition via Serface-Enhanced Raman Scattering: Self-Supervised Learning and Transfer Learning approaches

    , Authors: Junho Lee, Joonsuk Huh
    Version 1 posted 30 June 2025

    Extract found to contain search terms

    To maintain a consistent signal-to-noise ratio (SNR = 4.1) across the subsets, the integration time for the finetune and test subsets was increased from 1 s to 2 s due to degradation in the optical system’s efficiency. Detailed isolate information and experimental procedures can be found in the original dataset, which is publicly available at https://github.com/csho33/bacteria-ID/. 2.1.2 COVID -19 dataset We utilized the publicly available data from the recent work, which acts as a pilot study of primary screening of COVID -19 (COronaVIrus Disease 2019) by Raman spectroscopy. This dataset contains a total of 177 serum samples collected from 63 COVID -19 patients, 59 suspected ones, and 55 healthy people (i.e., the control group). The COVID
    0
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    Category: Chemical Engineering and Industrial Chemistry
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    Working Paper
    , Title:

    Model-Based Optimization of Fed-Batch In Vitro Transcription

    , Authors: Nathan Merica Stover, Soroush Ahmadi, Jacob Rosenfeld, Francesco Destro, Allan S. Myerson, Richard D. Braatz
    Version 1 posted 27 June 2025

    Extract found to contain search terms

    Speciation Reaction K (M) Tris + H+ ←→ HTris+ 10−8.1 PPi4− +H+ ←→ HPPi3− 10−9.02 [9 ] HPPi3− +H+ ←→ H2PPi 2− 10−6.26 [9 ] PPi4− +Na+ ←→ NaPPi3− 10−0.21 [10] NaPPi3− +Na+ ←→ Na2PPi 2− 100.8 [10] PPi4− +Mg2+ ←→ MgPPi2− 10−5.42 [9 ] MgPPi2− +Mg2+ ←→ Mg2PPi 10−2.33 [9 ] HPPi3− +Mg2+ ←→ HMgPPi− 10−3.05 [9 ] H2PPi 2− +Mg2+ ←→ H2MgPPi 10−2.11 [11] NTP4− +H+ ←→ HNTP3− 10−6.48 [12] HNTP3− +Mg2+ ←→ HMgNTP− 10−2.00 [12] NTP4− +Mg2+ ←→ MgNTP2− 10−4.73 [9 ] MgNTP2− +Mg2+ ←→ Mg2NTP 10−1.69 [9 ] NTP4− +Na+ ←→ NaNTP3− 10−1.16 [9 ] Sp3+ +NTP4− ←→ SpNTP− 10−2.95 [13] Sp3+ + SpNTP− ←→ Sp2NTP2+ 10−2.43 [13] Pi3− +H+ ←→ HPi2− 10−12.37 [12] HPi2− +H+ ←→ H2Pi 1− 10−6.92 [9 ] HPi2− +Mg2+ ←→ HMgPi 10−2.20 [9 ] HPi2− +Na+ ←→ HNaPi− 10−0.77 [9
    11
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    Category: Chemical Education
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    Working Paper
    , Title:

    A general small language model (SLM) approach to examining scientific trends through conference proceedings: application to the 2019 and 2024 annual meetings of the Brazilian Chemical Society

    , Authors: Rubens Souza, Nathalia Rosa, Julio Duarte, Itamar Borges Jr
    Version 1 posted 25 June 2025

    Extract found to contain search terms

    These compounds, often linked to surface chemistry and organic frameworks in adsorption studies, appear to be getting less attention as the field advances toward greener and more sustainable alternatives. 27 Table 6 - Distribution of Abstracts by Research Keyword (2019 vs. 2024) Keyword 2019 Count 2019 Percentage (%) 2024 Count 2024 Percentage (%) Percentage Change (2019 to 2024) adsorption 32 0.67 18 0.54 -0.12 green chemistry 31 0.64 14 0.42 -0.22 synthesis 23 0.48 14 0.42 -0.06 catalysis 18 0.37 13 0.39 0.02 dft 11 0.23 13 0.39 0.16 teaching of chemistry 14 0.29 7 0.21 -0.08 ruthenium 9 0.19 12 0.36 0.17 molecular docking 8 0.17 12 0.36 0.20 nanoparticles 10 0.21 9 0.27 0.06 Table 7 - Distribution of Abstracts by Research Molecule (2019 vs. 2024) Molecule 2019 Count 2019 Percentage (%) 2024 Count 2024 Percentage (%) Percentage Change (2019 to 2024) phenyl 79 2.19 40 1.64 -0.55 metal ions 62 1.72 30 1.23 -0.49 ethylene 38 1.05 33 1.35 0.30 ethanol 30 0.83 20 0.82 -0.01 cl2 23 0.64 12 0.49 -0.15 benzene 26 0.72 6 0.25 -0.48 benzaldehyde 20 0.56 10 0.41 -0.14 water 20 0.56 6 0.25 -0.31 fe 15 0.42 6 0.25 -0.17 mn 12 0.33 9 0.37 0.04 carbon dioxide 9 0.25 10 0.41 0.16 glycerol 10 0.28 9 0.37 0.09 acetic acid 10 0.28 7 0.29 0.01 nitrogen 9
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    Category: Analytical Chemistry
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    Working Paper
    , Title:

    Characterization of Gas-Phase Native(-Like) Proteins Using Structures for Lossless Ion Manipulations

    , Authors: Jung Lee, Viraj Gandhi, Christopher Harrilal, Amar Parvate, Harsh Bhotika, Stephanie Thibert, Ashley Ives, Xin Zhang, Gregory Schenter, Carlos Larriba-Andaluz, James Evans, Yehia Ibrahim, Sandilya Venkata Bhaskara Garimella
    Version 2 posted 30 June 2025

    Extract found to contain search terms

    Mass spectra of carbonic anhydrase (CA) showed three different charge states (z = 9
    126
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    Category: Biological and Medicinal Chemistry
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    Working Paper
    , Title:

    Synthesis and Evaluation of Novel Oxanthrene Scaffold-derived Oxazolidinone Antibiotics with Potent Antitubercular Activity and Low Cellular Toxicity

    , Authors: Kelsey R. Latterell, Evan Keil, Benjamin R. Kraemer, Joe B. Huisken, Ben A. Thomas, Noah Daniels, Amit Kaushik, Maria Lillian Olson, Pamela Meléndez Noriega, Maria Alejandra Pizarro Daniels, Daron E. Janzen, Gyanu Lamichhane, Monica Campo, J. Thomas Ippoliti
    Version 1 posted 24 June 2025

    Extract found to contain search terms

    However, the methoxy substitution discussed in that work resulted in the inseparable isomers 9 and 10, which were significantly less active against Mtb compared to T145 and linezolid [40]. Figure 2. Previously reported oxanthrene containing oxazolidinones with anti-tubercular activity. Accordingly, we aimed to regioselectively introduce a functionalizable handle to the oxanthrene scaffold, while preserving potent antitubercular activity. Furthermore, we sought to explore how the position of the substitution on the oxanthrene moiety influenced antibacterial activity. Based on the spatial characteristics of other oxazolidinones, we hypothesized that substitution of groups at the 6 and 9 positions observed in 9
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    Category: Organic Chemistry
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    Working Paper
    , Title:

    Decagram-scale synthesis of GB13, a Galbulimima alkaloid precursor

    , Authors: Stephan Freeman, Eleanor Landwehr, Juan Rojas, Riku Tanaka, Jake Bailey, Milan Gembicky, Ryan Shenvi
    Version 1 posted 25 June 2025

    Extract found to contain search terms

    Enone 8 was reacted with diethyl malonate followed by in situ saponifi- cation and decarboxylation to afford diketone 9 (117.6 g, 64% over 4 steps from 7). Modified Bohlmann-Rahtz conditions em- ploying methoxyenone 10 outperformed conventional al- kynones20 to deliver rac-11 (101.7 g, 70%). Three purifications along the route – filtration of 9 , precipitation of 11 from DMF, and continuous Soxhlet extraction of 11 with heptane – elimi- nated chromatography entirely, producing rac-11 at a raw ma- terials cost of $9.08 per gram (Table S1). We chose resolution of rac-11 to access enantiopure GB13 (4) given the achirality of prior intermediates 8 and 9
    567
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    Category: Nanoscience
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    Working Paper
    , Title:

    Dynamic assembly of complex hierarchical DNA polymer networks by biomolecular active agents

    , Authors: Farhana Afroze, Richard Archer, Mahammad Mustakim, Rakesh Das, Arif Md. Rashedul Kabir, Yuuto Miura, Rubaya Rashid, Tetsuya Hiraiwa, Shin-ichiro M. Nomura, Shogo Hamada, Akira Kakugo
    Version 1 posted 26 June 2025

    Extract found to contain search terms

    Through energy dissipative processes, they actively 4 assemble and organize molecular components into complex, hierarchical structures with spatiotemporal 5 control.1–6 Harnessing such agents could be key to synthetically constructing far-from-equilibrium 6 materials that mimic the structural and functional sophistication of living systems. 7 The remarkable operations and efficiencies of these natural agents have created an ever-growing demand 8 for their utilization in industrial processes for the synthesis of complex biologically active molecules,7–9 9
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