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Filename: controllers/Detail.php
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File: /var/www/html/index.php
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In this work, we developed (thio)ureido-calix[4]arene derivatives and thoroughly explored their anion-binding properties in acetonitrile. A series of anions, including important inorganic ones (Cl, HSO , HPO , and HPO ) and several ever-present carboxylates (acetate, benzoate, and fumarate), were studied. All systems were investigated by several methods (NMR, ITC, and UV) used in a synergistic fashion, providing their comprehensive thermodynamic description. Acidities of the receptors were determined prior to the anion-binding studies and considered in the data-handling procedures. Complexes of various stoichiometries were detected and the driving force for their formation elucidated. The correlation of the anion structural features and H-bond acceptor properties with the stoichiometries and complexation thermodynamics parameters was rationalized. Generally, stability of the complexes followed the trend defined by the basicity of anions. Thiourea and urea analogues exhibited similar affinities for anion binding except for the HPO and HPO , which interacted with the thiourea analogue more strongly. The hosts endowed with 4 (thio)urea groups formed species containing two receptor molecules bridged by a fumarate or hydrogen pyrophosphate anion. Thermodynamic information provided in this work is applicable in further design of supramolecular systems, whereas the presented approach to data handling will aid researchers when dealing with multiple coexisting equilibria.
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http://dx.doi.org/10.1021/acsphyschemau.4c00077 | DOI Listing |
J Chromatogr A
December 2024
Department of Biochemical Engineering, School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin 300350, PR China. Electronic address:
Our previous studies on protein adsorption onto anion-exchangers of poly(ethylenimine) (PEI)-grafted Sepharose FF (PEI-Sepharose) proved their significantly improved performance over the commercial nongrafting anion-exchangers such as Q Sepharose FF, and it was found the protein adsorption behavior on PEI-Sepharose was more sensitive to counterions (Cl, SCN, HPO and SO). However, the complicated role of counterions has not been well interpreted due to their distinct chemical and physical characteristics. Thus, we have further studied the counterion effects by adding two halide ions (F and Br) to explore the effects of the three halide ions on bovine serum albumin adsorption and the results were compared with previous data.
View Article and Find Full Text PDFGM Crops Food
December 2025
College of Agronomy, Jilin Agricultural University, Changchun, China.
Maize ( L.) is a major food and feed crop and an important raw material for energy, chemicals, and livestock. The NF-Y family of transcription factors in maize plays a crucial role in the regulation of plant development and response to environmental stress.
View Article and Find Full Text PDFInarguably, the green fluorescent protein (GFP) family is an exemplary model for protein engineering, accessing a range of unparalleled functions and utility in biology. The first variant to recognize and provide an optical output of chloride in living cells was serendipitously uncovered more than 25 years ago. Since then, researchers have actively expanded the potential of GFP indicators for chloride through site-directed and combinatorial site-saturation mutagenesis, along with chimeragenesis.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Ludwig-Maximilians-Universitat Munchen, Pharmacy, Butenandtstraße 5 - 13, 81377, Munich, GERMANY.
Helical aromatic oligoamide foldamers bearing anionic side chains that mimic the overall shape and charge surface distribution of DNA were synthesized. Their interactions with chromosomal protein Sac7d, a non-sequence-selective DNA-binder that kinks DNA, were investigated by Surface Plasmon Resonance (SPR), Isothermal Titration Calorimetry (ITC), Circular Dichroism spectroscopy (CD), melting curve analysis, Atomic Force Microscopy (AFM), and Nuclear Magnetic Resonance (NMR), as well as by single crystal X-ray crystallography. The foldamers were shown to bind to Sac7d better than a DNA duplex of comparable length.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
ICCAS: Institute of Chemistry Chinese Academy of Sciences, ICCAS, ICCAS, CHINA.
Organic photovoltaic materials typically exhibit low charge separation and transfer efficiency and severe exciton/carrier recombination due to high exciton binding energy and short exciton diffusion lengths, limiting the enhancement of photocatalytic hydrogen evolution performance. Here, we introduce a surface charge reversal strategy to regulate charge characters of organic photovoltaic catalyst (OPC). Compared to OPC nanoparticles (NPs) stabilized by anionic surfactant ((-) NPs), NPs stabilized by cationic surfactant ((+) NPs) exhibit a raised Fermi level, larger surface band bending and Schottky barrier, thereby enhancing charge separation and transfer efficiency while suppressing charge carrier recombination.
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