JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Yong Yu,Zhongxiang Yang,Zhichao Shang,Xiaohong Wang
In this study, Bi/BiOCl nanosheets were prepared by a rapid, cost-efficient and one-step solution combustion synthesis method using a mixed fuel (glycine and tartaric acid). Through thermometry and thermogravimetric analysis/differential scanning calorimetry (TGA-DSC), the combustion mode and reaction mechanism are analyzed. The reducing gas produced by the mixed fuel is a necessary condition for obtaining metal Bi decorated BiOCl , and the content of Bi in the composite can be regulated by adjusting the molar ratio of Bi/Cl in reactants. In addition, under visible light irradiation, due to the SPR effect of metal Bi, Bi/BiOCl composite photocatalyst shows better photocatalytic performance, in which the highest degradation efficiency of Rhodamine B (RhB) within 120 min is 2.6 times higher than that of BiOCl. Thus, the present study provides an economic and convenient method for the tunable synthesis of a high-efficiency catalyst for the degradation of pollutants.
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BIOELECTROCHEMISTRY
·
2022
·
IF 5.76
Ya Zhang,Ning Li,Ying Xu,Xiaofang Liu,Yi Ma,Zhen Huang,Huibo Luo,Changjun Hou,Danqun Huo
Antimonene (AMNFs) is a new kind of sp 2 -bonded honeycomb lattice two-dimensional material with strong rod-rail coupling, stability and hydrophilicity. Compared with graphene, antimonene has better sensitivity in DNA molecular sensing. We developed a suitable biosensor-Cd 2+ [email protected] @ZIF-67 nanocomposite for HER2 biomarker detection. Two-dimensional antimonene can be grown on the surface of ZIF-67 to enhance stability and biocompatibility. The aptamer chain can also be adsorbed on the surface of antimonene, and the complexes of the aptamer and the marker can be detached analytically after targeting the biomarker. The detection limit (LOD) was 4.853 fg/mL within 60 min, the detection range was 0–1000 pg/mL, and the LOD was lower than the existing HER2 aptamer biosensors. The results show that the biosensor has certain applicability and potential, and is expected to be a powerful tool for breast cancer diagnosis in the future.
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PubMed
高影响因子
Gels
·
2022
·Vol. 9
·期 1
·10
·
IF 4.432
Yanjin Tang,Yuhan Lai,Ruiqin Gao,Yuxuan Chen,Kexin Xiong,Juan Ye,Qi Zheng,Zhenxing Fang,Guangsheng Pang,Hoo-Jeong Lee
Functional aerogels composed of regenerated cellulose and tungsten oxide were fabricated by implanting tungsten-oxide nanodots into regenerated cellulose fiber. This superfast photochromic property benefitted from the small size and even distribution of tungsten oxide, which was caused by the confinement effect of the regenerated cellulose fiber. The composite was characterized using XRD and TEM to illustrate the successful loading of tungsten oxide. The composite turned from pale white to bright blue under ambient solar irradiation in five seconds. The evidence of solar absorption and electron paramagnetic resonance (EPR) demonstrated the fast photochromic nature of the composite and its mechanism. Furthermore, carbon fiber filled with preferential growth tungsten-oxide nanorods was obtained by annealing the photochromic composite in a N2atmosphere. This annealed product exhibited good absorption across the whole solar spectrum and revealed an excellent photothermal conversion performance. The water evaporation rate reached 1.75 kg m−2h−1under one sun illumination, which is 4.4 times higher than that of pure water. The photothermal conversion efficiency was 85%, which shows its potential application prospects in seawater desalination.Keywords:functional aerogels;regenerated cellulose;color center;solar absorbent;desalination
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2022
·
IF 2.345
Li Dai,Di Xu,Peng-Fei Song,Jun Zhang
Featured by abundant derivation and powerful catalytic activities, chiral catalysts and ligands with oxazolinyl ferrocenes core play a vital role in the area of enantioselective transformations. Despite great researches on phosphine ligands with oxazolinyl ferrocene silyl ether core have been broadly explored, the example of N,O -ferrocene compounds with identical core is rare. We herein disclosed the practical approaches to the preparation of planar chiral oxazolinyl hydroxyl ferrocene silyl ethers. Several available methods were employed for the establishment of the configuration on planar chirality , which considered as key parameter for the subsequent relative products. Furthermore, an array of N,O,O- tridentate ferrocenes was obtained through desilylation treated with TBAF. The absolute stereochemical configuration of the synthesized ferrocene derivatives was determined by X-ray diffraction.
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JOURNAL OF BIOCHEMISTRY
·
2023
·Vol. 173
·期 5
·343-352
·
IF 2.7
Cui Mingxin,Wong Okei,Li Qiang,Wang Wenya
T7 system is a commonly used in protein expression and the highest transcription activity of T7 RNAP usually caused the instability of T7 system. In order to apply T7 system extensively, it is essential to characterize T7 RNAP activity. In the present paper, an assay method for T7 RNAP activity was developed with a transcription–translation (TX-TL) system. After the optimization of TX-TL system, the operating parameters were determined as 34°C, 60 min with 20 ng/μl of plasmid DNA template. The standard curve of TX-TL assay method indicated an excellent correlation (r = 0.998), and the sensitivity was better than that of western blotting method. The precision investigation indicated a mean-relative error of 2.58% and a standard-relative error of 7.01%. Moreover, the cell lysate could be added directly to the optimized TX-TL system without affecting T7 RNAP activity assay. The feasibility of present method was further confirmed by characterizing T7 RNAP activity in cell lysate of five strains of Escherichia coli (E. coli) DH5α with different T7 RNAP activities and seven commercial strains of E. coli (DE3).
The present assay method for T7 RNAP activity would have a great application in synthetic biology, metabolic engineering, enzyme engineering and biomedicine.
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ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Boyu Jia,Tianbao Liu,Juanjuan Wan,Andrei Ivanets,Yujia Xiang,Lijuan Zhang,Xintai Su
Microbial reduction of hexavalent chromium (Cr (VI)) shows better efficiency and cost-effectiveness. However, immobilization of Cr (III) remains a challenge as there is a limited supply of electron donors. A greener and cleaner option for donating external electrons was using bioelectrochemical systems to perform the microbial reduction of Cr(VI). In this system, we constructed a polydopamine (PDA) decorated Shewanella oneidensis MR-1 ( S. oneidensis MR-1) bioelectrode with bidirectional electron transport, abbreviated as PDA@ S. oneidensis MR-1. The conjugated PDA distributed on the intracellular and extracellular of individual S. oneidensis MR-1 has been shown to accelerate electron transfer by outer membrane C-type cytochromes and flavin-bound MtrC/OmcA pathway by various electrochemical analyses. As expected, the PDA@ S. oneidensis MR-1 biofilm achieved 88.1% Cr (VI) removal efficiency (RE) and 58.1% Cr (III) immobilization efficiency (IE) within 24 h under the autotrophic conditions at the optimal voltage (−150 mV) compared with the control potential (0 mV). The PDA@ S. oneidensis MR-1 biofilm showed increased RE activity was attributed to the shortening of the distance between individual bacteria by PDA. This research provides a viable strategy for in situ bioremediation of Cr(VI) polluted aquatic environment.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2023
·
IF 6.7
Dongliang Guan,Jian Li,Feifei Chen,Jiaqi Li,Xiaolei Bian,Yue Yu,Xinxin Feng,Lefu Lan,Wei Huang
Wide-spread use of daptomycin unavoidably resulted in the emergence of daptomycin-resistant pathogens. In the hunt for more active daptomycin derivatives through medicinal chemistry studies, we established a concise semisynthetic approach to modify the L-Kyn13 on daptomycin specifically and effectively. Here, 19 novel derivatives with certain diversity were designed and synthesized to perform a comprehensive SAR study on this underestimated position. The optimal compound, termed “hexakynomycin”, as the new generation of daptomycin-based antibiotic candidate exhibited 4->125-fold higher activity against methicillin-susceptible S. aureus (MSSA), methicillin-resistant S. aureus (MRSA), vancomycin-intermediate resistant S. aureus (VISA), and vancomycin-resistant Enterococci (VRE), including daptomycin-resistant strains, compared with that of daptomycin. Greater membrane binding capacity rendered hexakynomycin better activity and special antibiotic property. Hexakynomycin also demonstrated a better pharmacokinetic profile, good safety features and good pharmacodynamics properties. This work provided an effective modification strategy aiming at daptomycin which provided significant insights and showed great promise for the next generation of daptomycin derivatives.
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高影响因子
Small
·
2023
·Vol. 19
·期 44
·2303887
·
IF 13.3
Jiahui Guo,Yunru Yu,Yingbo Shen,Xiaoyan Sun,Yan Bi,Yuanjin Zhao
Wound healing, known as a fundamental healthcare issue worldwide, has been attracting great attention from researchers. Here, novel bioactive gellan gum microfibers loaded with antibacterial peptides (ABPs) and vascular endothelial growth factor (VEGF) are proposed for wound healing by using microfluidic spinning. Benefitting from the high controllability of microfluidics, bioactive microfibers with uniform morphologies are obtained. The loaded ABPs are demonstrated to effectively act on bacteria at the wound site, reducing the risk of bacterial infection. Besides, sustained release of VEGF from microfibers helps to accelerate angiogenesis and further promote wound healing. The practical value of woven bioactive microfibers is demonstrated via animal experiments, where the wound healing process is greatly facilitated because of the excellent circulation of air and nutritious substances. Featured with the above properties, it is believed that the novel bioactive gellan gum microfibers would have a remarkable effect in the field of biomedical application, especially in promoting wound healing.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Zhichao He,Huitong Luo,Zetao Wang,Dafu Chen,Qi Feng,Xiaodong Cao
Oxidative stress and inflammation are common pathological mechanisms for the progression of tissue degeneration. Epigallocatechin-3-gallate (EGCG) features antioxidant and anti-inflammatory properties, which is a promising drug for the treatment of tissue degeneration. Herein, we utilize the phenylborate ester reaction of EGCG and phenylboronic acid (PBA) to fabricate an injectable and tissue adhesive EGCG-laden hydrogel depot (EGCG HYPOT), which can achieve anti-inflammatory and antioxidative effects via smart delivery of EGCG. Specifically, the phenylborate ester bonds, formed by EGCG and PBA-modified methacrylated hyaluronic acid (HAMA-PBA), endow EGCG HYPOT injectability, shape adaptation and efficient load of EGCG. After photo-crosslinking, EGCG HYPOT exhibits good mechanical properties, tissue adhesion and sustained acid-responsive release of EGCG. EGCG HYPOT can scavenge oxygen and nitrogen free radicals . Meanwhile, EGCG HYPOT can scavenge intracellular reactive oxygen species (ROS) and suppress the expression of pro-inflammatory factors. EGCG HYPOT may provide a new idea for alleviation of inflammatory disturbance.
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高影响因子
Magnetochemistry
·
2022
·Vol. 8
·期 10
·118
·
IF 3.336
Yujie Yang
W-type hexaferrites were discovered in the 1950s and are of interest for their potential applications. In this context, many researchers have conducted studies on the partial substitution of Fe sites in order to modify their electric and magnetic properties. In this study, W-type SrYb hexaferrites using Al3+as substitutes for Fe3+sites with the nominal composition Sr0.85Yb0.15Zn1.5Co0.5AlxFe16−xO27(0.00 ≤ x ≤ 1.25) were successfully synthesized via the two-step calcination method. The microstructures, spectral bands of characteristic functional groups, morphologies, and magnetic parameters of the prepared samples were characterized using XRD, FTIR, SEM, EDX, and VSM. The XRD results showed that, compared with the standard patterns for the W-type hexaferrite, the W-type SrYb hexaferrites with the Al content (x) of 0.00 ≤ x ≤ 1.25 were a single-W-type hexaferrite phase. SEM images showed the flakes and hexagonal grains of W-type hexaferrites with various Al content (x). The saturation magnetization (Ms) and magneton number (nB) decreased with Al content (x) from 0.00 to 1.25. The remanent magnetization (Mr) and coercivity (Hc) decreased with Al content (x) from 0.00 to 0.25. Additionally, when the Al content (x) ≥ 0.25,MrandHcincreased with the increase in the Al content (x). The magnetic anisotropy field (Ha) and first anisotropy constant (K1) increased with the Al content (x) increasing from 0.00 to 1.25. Al-substituted W-type SrYb hexaferrites with soft magnetic behavior, highMs, and lowerHcmay be used as microwave-absorbing materials.Keywords:two-step calcination method;W-type hexaferrites;magnetic properties;X-ray diffraction
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JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Tingting Bao,Hui zhou,Yi Zhang,Chenxu Guo,Wenming Guo,Hang Qin,Pengzhao Gao,Hanning Xiao,Weixiong Liu
Ni/CeO 2 catalysts ( n CeO2 : n Ni = 0, 1, 4, 7, 10) supported on SiC porous ceramics for ethanol steam reforming (ESR) were investigated with respect to hydrogen production performance and growth of carbon deposition. The oxygen released from CeO 2 enables the oxidation of CH x species to serve as carbon precursors, thus providing Ni/CeO 2 catalysts with stronger resistance to carbon deposition compared with Ni catalysts. The Ni/CeO 2 catalysts prepared by inverse microemulsion and impregnation methods exhibit regular semicircular spherical shape on SiC porous ceramics. Under 500 °C for 25 h of ESR reaction, the ethanol conversion rate over Ni/CeO 2 catalysts ( n CeO2 : n Ni = 7) is sustained up to 100% and H 2 selectivity is essentially kept at 74%. The by-product selectivity declines stepwise with increasing content of CeO 2 , which is attributed to the adsorption and oxidation of CO and of CH x species as CH 4 precursor from CeO 2 . The scanning electron microscopy (SEM) and transform electron microscopy (TEM) results reveal that further loading of CeO 2 on the surface of Ni catalysts can alleviate both migration and sintering of Ni particles. Furthermore, carbon deposition on Ni/CeO 2 catalysts preferentially outgrow filamentous rather than amorphous carbon , with a tendency for the latter to be more deactivated.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hangtao Ye,Luojia Huang,Xiaoting Liu,Meiting Yang,Wenya Chen,Yihuang Chen,Weidong Xiang,Shuang Pan,Xiaojuan Liang
Although backlight display screens based on CdSe quantum dots (QDs) have basically solved the remaining problem of small display gamut, its high preparation cost limits its commercial development. In contrast, perovskite nanocrystals (NCs) with narrow band emission, simple preparation and low cost have made leaps and bounds in next-generation backlit displays luminescent material . However, the instabilities are the main issues to solve before we can apply these materials in modern displays. Researchers have precipitated perovskite NCs in inorganic glass substrates and compounded them with PDMS films for backlighting, but the important factors for commercialization have been ignored: Long-term stability under strong blue light irradiation and preparation cost. In this work, a unique melt-water quenching method combined with composition control was applied to prepare a series of glass powder. The optimal photoluminescence (PL) emission and color coordinates in the color coordinates of glasses powder were elaborately regulated by heat treatment temperature control and the introduction of rare earth Tb. Moreover, the passivation of the glass powder surface through special water treatment greatly improves its stability under long time blue light exposure. After irradiation under 20000 cd/m 2 blue light (460 nm) for 500 h, the PL intensity retention rate reaches 85% of commercial CdSe film. The red and green-emitting NCs glasses powder with high photoluminescence quantum yield (PLQY) and stability were combined with PET, PS and PDMS to form a composite film , afterwards, combined with Liquid crystal display ( LCD ) module shows a fuller color image. Finally, after comparison, PS film was demonstrated to be the most suitable choice for commercialization backlighting.
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