INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Hui Zhang,Qiang Fu,Hongyun Qin,Xia Chen,Qicheng Zhang,Zixu Dong,Haoyuan Li,Shoudong Wang,Ming Wang
Hydrogen recovery from ammonia purge gas is a desirable method to relieve the pressure of increasing demand for hydrogen. Metal-organic frameworks (MOFs) are promising adsorbents for the separation of the H 2 –N 2 mixture. However, the separation of the H 2 –N 2 mixture using MOFs remains challenging due to the lack of adsorptive mechanism. Herein, the adsorption mechanism of the H 2 –N 2 mixture in SIFSIX-2-Cu-i has been systematically investigated with the method of a combination of excess adsorption experiments, molecular simulations , and DFT calculations. In the Grand Canonical Monte Carlo (GCMC) simulations, the polarizable force field was first applied to the adsorption of pure H 2 or N 2 and H 2 –N 2 mixture in SIFSIX-2-Cu-i. Ab Initio Molecular Dynamics (AIMD) was performed to investigate the distribution of the guest molecules in the pores of SIFSIX-2-Cu-i. Finally, Density functional theory (DFT) calculations were performed to predict the transfer of charge between MOF and guest molecules. Results revealed two binding sites of H 2 or N 2 in SIFSIX-2-Cu-i. A relatively high thermodynamic adsorption selectivity for N 2 over H 2 has been observed in SIFSIX-2-Cu-i. Furthermore, SIFSIX-2-Cu-i also exhibits a greater affinity with N 2 than with H 2 , which is probably because of the stronger induction interactions between F2 atoms and N 2 molecules. These findings are of significance to guide the design of the new highly selective adsorbents for the separation of H 2 /N 2 .
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Materials Today Chemistry
·
2023
·
IF 7.3
D. Ma,Y. Lan,D. Zhang,X. Qin,Z. Yang,H. He,X. Dai,Z. Ye,X. Cao
Organic-inorganic perovskite materials have shown excellent performance and strong competitiveness in high-performance photovoltaic and optoelectronic devices. Besides the color-tunable and narrow-band emissions realized in hybrid perovskites, broadband emission from lead-halide perovskites has also attracted strong interest for applications in the next generation of solid-state lighting. Although great progress has been made in lead halide perovskites, a very important aspect that hinders their commercial exploitation is the severe lead toxicity. In this research, a lead-free copper(I)-iodine hybrid was synthesized by a solution evaporation method at room temperature. Single crystal X-ray diffraction shows that this hybrid possesses the chemical formula of C 6 H 5 CH 2 CH 2 NH 3 CuI 2 . The C 6 H 5 CH 2 CH 2 NH 3 CuI 2 belongs to the monoclinic phase with the C2/c space group, where the edge-sharing [CuI 4 ] tetrahedral chains are separated by organic C 6 H 5 CH 2 CH 2 NH 3 + ions, exhibiting one-dimensional (1D) crystal structure. The optical band-gap of C 6 H 5 CH 2 CH 2 NH 3 CuI 2 was determined to be 4.02 eV. The photoluminescence (PL) spectrum shows a broadband emission ranging from 380 nm to 780 nm and peaks at 542 nm together with a small peak at 336 nm, which can be attributed to the emission of self-trapped exciton (STE) and free exciton (FE), respectively. The large Stokes shift of 230 nm between the PL and photoluminescence excitation (PLE) as well as the broad emission was ascribed to the Jahn–Teller lattice distortion of [CuI 4 ] tetrahedra. The reduced 1D characteristic facilitates the tetrahedral distortion. PL decay analysis shows that the average lifetime of STE is about 66.9 ns? Temperature and time-dependent PL measurements show that the normal working temperature of this luminescent material should be no higher than 100 °C. Theoretical calculations were performed to better understand this compound. The successful synthesis and preliminary optical investigations on C 6 H 5 CH 2 CH 2 NH 3 CuI 2 can be of great significance for offering more environmental-benign options in both solid-state lighting and other perovskite optoelectronic devices.
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Oncologie
·
2023
·Vol. 25
·期 3
·233-243
·
IF 0.9
Simin Deng,Yuan Xu,Binbin Gao,Tingting Yu,Lun Kuang,Bo’ang Han,Shaolun Feng,Haodong Chi,Qing Cao,Shen Yue,Chen Liu
Objectives
The Sonic hedgehog (SHH) signaling is essential in animal development and tissue homeostasis. Aberrant activation of SHH pathway has been implicated in tumorigenesis and progression of several cancers, including ovarian cancer. Therefore, targeting SHH pathway may pave the way for successful ovarian cancer treatment.
Methods
To identify the potential SHH inhibitors from traditional Chinese medicines, we herein employed two in vitro cell models. In addition, western blotting and quantitative real-time PCR were performed to evaluate the inhibitory activity of Anemarrhenasaponin I (An-I) on SHH signaling in ovarian cancer cells. Cell proliferation assay and transwell assay were used to assess the effect of An-I on tumorigenicity. We also applied RNA-seq to examine the potential mechanism of An-I against ovarian cancer.
Results
Drug screening results showed that An-I drastically inhibited SHH signaling. More importantly, An-I effectively suppressed ovarian cancer cell proliferation and aggressiveness. RNA-seq-based transcriptome data showed that An-I affected ovarian cancer cells by suppressing SHH-WNT-Matrix metalloproteinases (MMPs) pathway.
Conclusions
An-I suppressed ovarian cancer progression by inhibiting SHH-WNT-MMP signaling transduction, providing a new treatment strategy for ovarian cancer.
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NUCLEAR TECHNOLOGY
·
2022
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IF 1.667
Yanhui Wang,Qiao Jiang,Yexin Yang,Jianfeng Cheng,Chenyang Bao,Yuelong Pan,Yu Liu,Gang Yang,Yangchun Leng,Xianguo Tuo
The alteration of the morphology of bentonite, a key barrier to isolating high-level radioactive waste in deep geological repositories under long-term interaction with groundwater, was studied. Bentonite colloids were prepared from Gaomiaozi bentonite, and its various properties were analyzed by various characterization methods. The effects of various factors on the adsorption of Cs(I) and Co(II) on bentonite colloids were investigated by batch static adsorption experiments. The results showed that the colloids were mainly composed of montmorillonite and were lamellar in shape, with a zeta potential of −enton mV and an average size of approximately 209.10 nm. The adsorption of Cs(I) and Co(II) by the colloids was a rapid process, and 31.78 and 88.24 mg/g, respectively, were adsorbed at equilibrium. Pseudo-second-order kinetic fitting showed that chemisorption plays a dominant role and acid-base interactions affect adsorption by influencing the stability of colloids and the chemical form of simulated nuclides. This work can be helpful for evaluating the safety of waste repositories.
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WATER RESEARCH
·
2023
·
IF 12.8
Ying Wang,Guangliang Liu,Yingying Fang,Peng Liu,Yanwei Liu,Yingying Guo,Jianbo Shi,Ligang Hu,Yong Cai,Yongguang Yin,Guibin Jiang
Liquid elemental mercury droplet (Hg(0) l ) is an important species in heavy Hg-contaminated environments. The oxidation processes of Hg(0) l and its related mechanisms are still poorly understood. Herein, for the first time, it was verified that mercurous species [Hg(I)] was an important species in natural water contaminated by Hg(0) l as well as in the simulated dark oxidation of Hg(0) l . The formation and further transformation of Hg(I) controlled the overall oxidation process of Hg(0) l and were affected by different environmental factors. Through kinetic modeling using ACUCHEM program, oxidation of Hg(0) to Hg(I) (Hg(0) → Hg(I)) was determined to be the rate-limiting step in Hg(0) l oxidation because its k value ((8.7 ± 0.21) × 10 −11 s −1 ) is seven orders of magnitude lower than that of Hg(I) oxidation (Hg(I) → Hg(II), (4.7 ± 0.15) × 10 −4 s −1 ). Ligands like OH − , Cl − , and natural organic matter enhanced the formation of Hg(I) via promoting the constants of comproportionation (up to (9.5 ± 0.78) × 10 −4 s −1 ). These findings highlight the importance of Hg(I) in Hg(0) l oxidation process by controlling the transformation kinetics of Hg species, facilitating an improved understanding of the environmental redox cycles of Hg.
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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2022
·
IF 1.837
Chengfei Yue,Changkun Ding,Jieliang Su,Bowen Cheng
Owing to their central roles in cellular signaling, construction, and biochemistry, collagen-collagen interactions, and collagen self-assembly have become a major focus of molecular design and synthetic biology. The well-ordered assembly of collagen molecules on mica has attracted extensive attention for its essential applications and studies on the self-assembly process as a model system. Although collagen assembly mediated by various ions on mica has been reported over these years, specific effects of transition metal ions in this field have never been deeply surveyed and discussed till now. In this work, type I collagen extracted from rat tail tendon by pepsin solubilization method was selected to explore the kinetic process and self-assembly characteristics. In the presence of Cu2+ and Zn2+ sulfates, the turbidity method was used to directly measure the kinetic process of collagen self-assembly and atomic force microscopy (AFM) was applied to observe the patterns of collagen self-assembly on mica. The results showed that the favorable properties of transition metal coordination (bonding strength, directionality, and reversibility) were helpful for increasing the collagen fibrillogenesis rate, and at different ion concentrations, Cu2+ and Zn2+ ions affected the interactions between collagen molecules and mica surface by destroying the hydration membranes on the surface of collagen molecules and the hydrogen bonds between the amino acid residues of collagen molecules. Circular dichroism (CD) analysis demonstrated that collagen had complete triple-strand conformation in the presence of Cu2+ and Zn2+. These results and analysis would be helpful for directing the patterns of collagen self-assembly on a solid surface and provide theoretical guidance for creating collagen-based high-performance materials and/or adding functionality in materials for various applications.
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CHEMOSPHERE
·
2022
·
IF 8.943
Chengxue Ma,Xiaoliu Huangfu,Yijie Zou,Ruixing Huang,Qiang He,Jun Ma
The oxidation of thallium(I) (Tl (I)) to Tl (III) is referred to as an efficient means for Tl removal. Bromide (Br‾) inevitably occurs in nearly all water sources at concentrations of 0.01–67 mg/L (0.14–960 μM). The effect of Br‾ remains largely unclear but likely of critical importance on the redox fate and thus the removal potential of Tl (I) during typical oxidation treatment processes. Here, we investigate the kinetics and tackle the mechanism of Tl (I) oxidation by permanganate (KMnO 4 ) under the influence of Br‾. The results demonstrated that Br‾ at environmental levels exhibited significant catalytic effect on Tl (I) oxidation kinetics by KMnO 4 at acidic pH of 4.0–7.0, while no significant effect of Br‾ was observed for Tl(I) oxidation under alkaline conditions of pH 8.0 and 9.0. It was found that the enhanced oxidation kinetics under acidic conditions was driven by the combined effect of and autocatalysis mediated by MnO 2 and a fast oxidation kinetics served by in-situ formed bromine species. Through quantifying the relative contributions of those bromine species to the homogenous oxidation of Tl(I), HOBr, Br 2 and Br 2 O were found to play roles in catalyzing the oxidation of Tl(I) by KMnO 4 . The results discussed herein highlight the critical role of Br‾ on the Tl(I) complex oxidation process by KMnO 4 and may have implications for evaluating the redox cycle and removal potential of Tl in bromide-containing water treatment .
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 25
·e202104463
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IF 5.02
Yue Liu,Yuxiang Wang,Haoran Cheng,Zheng Ma,Qian Li,Gang Wang,Daocheng Pan,Limin Wang,Jun Ming
Graphical A new soluble CsPbX 3 precursor to in-situ prepare luminescent CsPbX 3 nanocrystal film in the air readily was designed. The composition of the CsPbX 3 NCs films can be tuned by changing the solution precursors, allowing obtaining a high color purity and a narrow emission width. Inorganic cesium lead halide perovskite nanocrystals are candidates for lighting and display materials due to their outstanding optoelectronic properties. However, the dissolution issue of perovskite nanocrystals in polar solvents remains a challenge for practical applications. Herein, we present a newly designed one-step spin-coating strategy to prepare a novel multicolor-tunable CsPbX 3 (X=Cl, Br, I) nanocrystal film, where the CsPbX 3 precursor solution was formed by dissolving PbO, Cs 2 CO 3 , and CH 3 NH 3 X into the ionic liquid n-butylammonium butyrate. The as-designed CsPbX 3 nanocrystal films show high color purity with a narrow emission width. Also, the blue CsPb(Cl/Br) 3 film demonstrates an absolute photoluminescence quantum yields (PLQY) of 15.6 %, which is higher than 11.7 % of green CsPbBr 3 and 8.3 % of red CsPb(Br/I) 3 film. This study develops an effective approach to preparing CsPbX 3 nanocrystal thin films, opening a new avenue to design perovskite nanocrystals-based devices for lighting and display applications.
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Frontiers in Cellular and Infection Microbiology
·
2023
·
IF 5.7
Shan. Gao,Wenjuan. Nie,Lina. Liu,Lei. Su,Yingxia. You,Ruixue. Geng,Naihui Chu
Objective To evaluate contezolid (MRX-I) antibacterial activity against Mycobacterium abscessus in vitro and in vivo and to assess whether MRX-I treatment can prolong survival of infected zebrafish. Methods MRX-I inhibitory activity against M. abscessus in vitro was assessed by injecting MRX-I into zebrafish infected with green fluorescent protein-labelled M. abscessus . Thereafter, infected zebrafish were treated with azithromycin (AZM), linezolid (LZD) or MRX-I then maximum tolerated concentrations (MTCs) of drugs were determined based on M. abscessus growth inhibition using one-way ANOVA. Linear trend analysis of CFU counts and fluorescence intensities (mean ± SE values) was performed to detect linear relationships between MRX-I, AZM and LZD concentrations and these parameters. Results MRX-I anti- M. abscessus minimum inhibitory concentration (MIC) and MTC were 16 μg/mL and 15.6 μg/mL, respectively. MRX-I MTC-treated zebrafish fluorescence intensities were significantly lower than respective LZD group intensities (whole-body: 439040 ± 3647 vs. 509184 ± 23064, p < 0.01); head: 74147 ± 2175 vs. 95996 ± 8054, p < 0.05). As MRX-I concentration was increased from 0.488 μg/mL to 15.6 μg/mL, zebrafish whole-body, head and heart fluorescence intensities decreased. Statistically insignificant differences between the MRX-I MTC group survival rate (78.33%) vs. corresponding rates of the 62.5 μg/mL-treated AZM MTC group (88.33%, p > 0.05) and the 15.6 μg/mL-treated LZD MTC group (76.67%, p > 0.05) were observed. Conclusion MRX-I effectively inhibited M. abscessus growth and prolonged zebrafish survival when administered to M. abscessus -infected zebrafish, thus demonstrating that MRX-I holds promise as a clinical treatment for human M. abscessus infections.
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Frontiers in Pharmacology
·
2021
·
IF 5.811
Yanru Ren,Yicheng Feng,Kunyao Xu,Saisai Yue,Tiantian Yang,Kaili Nie,Man Xu,Haijun Xu,Xin Xiong,Fabian Körte,Mike Barbeck,Peisen Zhang,Luo Liu
Dihydrotanshinone I (DHT) is a natural component in Salvia miltiorrhiza and has been widely researched for its multiple bioactivities. However, poor solubility and biocompatibility of DHT limit its desirable application for clinical purposes. Herein, DHT was encapsulated with bovine serum albumin (BSA) to enhance bioavailability. Compared to free DHT, DHT–BSA NPs (nanoparticles) showed an improved solubility in normal saline and increased protection against hydrogen peroxide–induced oxidative damage in PC12 cells. In addition, DHT–BSA NPs administered by intravenous injection displayed a significant efficacy in the middle cerebral artery occlusion/reperfusion models, without any impact on the cerebral blood flow. In summary, DHT–BSA NPs show an enhanced bioavailability compared with free DHT and a successful penetration into the central nervous system for stroke therapy, demonstrating their application potential in cardio–cerebrovascular diseases.
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ChemNanoMat
·
2020
·Vol. 7
·期 3
·270-276
·
IF 3.384
Shengrui Zhang,Yang Yu,Shujue Xu,Jun Liu,Mo Liu,He Su,Yajiao Hao,Minjie Li,Sean Xiao-An Zhang
Graphical Au(I)-thiolate nanosheets have been studied as new and efficient water-dispersible UV absorbents. UV screening is very important for the prevention of skin cancer and the elongation of the lifetime of organic/polymeric stuff. To overcome the main problems of poor hydrophilicity and easy leakage of organic UV absorbents, water-dispersible Au(I)-thiolate nanosheets have been studied as a new type of UV absorbents. The results show that Au(I)-thiolate nanosheets have i) very high molar absorption coefficients (>15000 mol/L . cm), ii) comparable or superior photostability to typical organic UV absorbents, and iii) high transparency and nearly no leakage in polymer matrix. So far, no other UV absorbents have been reported to have all the above good performances simultaneously. The transparent and colorless Au(I)-thiolate/polymer thin films can effectively block UV light, and such a material will surely extend the types and the application scenarios of UV absorbents.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 3.978
Kedong Han,Guode Li,Leigang Tian,Lijian Li,Yingming Shi,Taiguang Huang,Yujing Li,Qingbo Xu
Acute myocardial infarction (AMI) is a major cause of death globally. Studies show that cardiac troponin I (cTnI) is an ideal serum biomarker for AMI diagnosis and its sensitive detection is of great value for the effective treatment of the disease. Here, a new electrochemical biosensor for sensitive and specific detection of cTnI is proposed based on the use of a multifunctional peptide-oligonucleotide conjugate . The conjugate is designed to consist of a peptide domain that can bind to cTnI with high specificity and a DNA domain that can mediate the templated growth of quantum dots (QDs) to serve as the source of signals. The presence of target cTnI leads to the recruitment of QDs onto magnetic beads, thereby producing a remarkable electrochemical response on screen-printed electrode. Experiential results show that the biosensor allows cTnI detection with a desirable sensitivity and specificity even in serum samples. The detection limit is calculated to be 0.42 pg/mL. More inspiringly, the biosensor is feasible for monitoring the drug-induced change of cTnI expression level on cardiomyocyte-like cells derived from mesenchymal stem cells (MSCs), opening a new way for investigating MSCs differentiation . Overall, the biosensor may provide a powerful tool for cTnI detection, which has great potential for practical use in cell biology research and clinical diagnosis.
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