JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 32
·期 2
·536-547
·
IF 5.3
Chen Weishuo,Zhong Channa,Li Shuangcheng,Wen Die,Zhou Dongdong,Shao Jun,Chen Shuiliang,Hou Haoqing,Xiang Sheng
The blends of poly(D-lactic acid) and poly(L-lactic acid) (PDLA/PLLA) produce the stereocomplex crystals (SC) with a melting temperature of ~ 250 °C, which exhibits higher crystallization rate and mechanical strength than PDLA or PLLA. The SC was also reported as an effective nucleator for PLA homochiral crystals (HC). In the PDLA/PLLA blends, the SC would develop at first in most of cases. However, the morphology of SC in the asymmetric blends were rarely reported, and the effect of the SC morphology on the subsequently crystallization of HC was not clear yet. In this study, the PDLA/PLLA blends with dissimilar weight ratios were prepared by three methods, i.e. , electrostatic spinning, solution casting, and melted-cooling, and the SC with different morphologies were achieved. Then, the crystallization behavior of HC under the existence of SC was studied. Results indicated that the SC morphology exerted diverse effects on the formation of HC. The SC with fibrous and banded morphology produced by electrostatic spinning presented great limitation for the formation of HC. The SC with spherical morphology developed in the solution casting films enhanced the formation of HC. The SC with network structure produced in the melted-cooling specimens accelerated the crystallization rate of HC significantly. This investigation indicated that not only the content of SC, but also the morphology of SC would influence the crystallization behavior of HC, which would make a deep understanding for the crystallization behavior of PDLA/PLLA specimens.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-10
·
IF 5.3
Dong Hui,Jiang Zhenlong,Chen Yanan,Han Huabo,Zhou Yanli,Wang Xiaobing,Xu Maotian,Liu Lantao
Hydroxyl radical (•OH) detection is pivotal in medicine, biochemistry and environmental chemistry. Yet, electrochemical method–specific detection is challenging because of hydroxyl radicals’ high reactivity and short half-life. In this study, we aimed to modify the electrode surface with a specific recognition probe for •OH. To achieve this, we conducted a one-step hydrothermal process to fabricate a CoZnMOF bimetallic organic framework directly onto conductive graphite paper (Gp). Subsequently, we introduced salicylic acid (SA) and methylene blue (MB), which easily penetrated the pores of CoZnMOF. By selectively capturing •OH by SA and leveraging the electrochemical signal generated by the reaction product, we successfully developed an electrochemical sensor Gp/CoZnMOF/SA + MB. The prepared sensor exhibited a good linear relationship with •OH concentrations ranging from 1.25 to 1200 nM, with a detection limit of 0.2 nM. Additionally, the sensor demonstrated excellent reproducibility and accuracy due to the incorporation of an internal reference. It exhibited remarkable selectivity for •OH detection, unaffected by other electrochemically active substances. The establishment of this sensor provides a way to construct MOF-modified sensors for the selective detection of other reactive oxygen species (ROS), offering a valuable experimental basis for ROS-related disease research and environmental safety investigations. Graphical
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PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 2
·812-824
·
IF 4.705
Tian Haizhou,Cheng Sha,Zhen Jianghong,Lei Ziqiang
In arid areas, the rapid evaporation of water leads to severe water shortage for plant growth. Superabsorbent polymers have the prospect of preventing water evaporation because of its excellent water absorbency. However, insufficient in salt resistance, water retention, and swelling rate limit its application. Herein, we fabricated Hydroxyethyl cellulose-g-(Acrylic acid-co-2-Acrylamido-2-methyl-1-propane sulfonic acid)/laterite (HEC-g-P (AA-co-AMPS)/laterite) with exceptional abovementioned performances by aqueous solution polymerization. Under optimal synthesis conditions, the water absorbency of the superabsorbent polymer were 1294 g/g, 177 g/g, and 119 g/g in distilled water, tap water, and 0.9 wt% NaCl solution, respectively. The water retention of the superabsorbent polymer was still as high as 97.7% after 16 h at 25 ℃, the water absorbency was up to 832 g/g after re-swelling for 5 times at 40 ℃, and the water absorption reached swelling equilibrium was only 5 min. We investigated the effect of the mount of swollen hydrogel on the water evaporation rate in soil, and the results showed that hydrogels were effective in inhibiting soil water evaporation. Our study provides a new horizon for the application of superabsorbent polymer.
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-13
·
IF 3.9
Liu Shuai,Quan Lin,Yang Mei,Wang Dan,Wang Yong-Zhong
In this study, the effect of polyethylene glycol 8000 (PEG8000) stress on cellulase biosynthesis in Trichoderma reesei CICC2626 via calcium signaling was investigated, and a plausible mechanism by which intracellular Ca 2+ regulates the transcription of cellulase genes was proposed. The results indicated that the total cellulase (filter paper-hydrolyzing activity [FPase]), endoglucanase (carboxymethyl cellulase activity [CMCase]), and β-glucosidase activities of the strain were 1.3-, 1.2-, and 1.3-fold higher than those of the control (no PEG8000 addition) at a final concentration of 1.5% (w/v) PEG8000. Moreover, the transcriptional levels of cellulase genes, protein concentrations, and biomass increased. With the synergistic use of commercial cellulase and T. reesei CICC2626 cellulase to hydrolyze alkali-pretreated rice straw, the released reducing sugar concentration reached 372.7 mg/g, and the cellulose content (22.7%, 0.32 g) was significantly lower than the initial content (62.5%, 1.88 g). Transcriptome data showed that 12 lignocellulose degradation–related genes were significantly upregulated in the presence of 1.5% PEG8000. Furthermore, the addition of Ca 2+ inhibitors and deletion of crz1 (calcineurin-responsive zinc finger 1-encoding gene, which is related to the calcium signaling pathway) demonstrated that calcium signaling plays a dominant role in PEG8000-induced cellulase genes overexpression. These results revealed a link between PEG8000 induction and calcium signaling transduction in T. reesei CICC2626. Moreover, this study also provides a novel inducer for enhanced cellulase production. Key points • Cellulase biosynthesis in Trichoderma reesei could be enhanced by PEG8000 • PEG8000 could induce a cytosolic Ca 2+ burst in Trichoderma reesei • The activated calcium signaling was involved in cellulase biosynthesis Graphical abstract
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高影响因子
APOPTOSIS
·
2024
·Vol. 29
·期 9
·1679-1695
·
IF 6.1
Fan Aoyu,Li Yunpeng,Zhang Yunyan,Meng Wei,Pan Wei,Chen Meixi,Ma Zhongliang,Chen Wei
Prostate cancer (PCa) is one of the most common cancers affecting the health of men worldwide. Castration-resistant prostate cancer (CRPC), the advanced and refractory phase of prostate cancer, has multiple mechanisms of resistance to androgen deprivation therapy (ADT) such as AR mutations, aberrant androgen synthase, and abnormal expression of AR-related genes. Based on the research of the AR pathway, new drugs for the treatment of CRPC have been developed in clinical practice, such as Abiraterone and enzalutamide. However, many areas in this pathway are still worth exploring. In this study, single-cell sequencing analysis was utilized to scrutinize significant genes in the androgen receptor (AR) pathway related to CRPC. Our analysis of single-cell sequencing combined with bulk-cell sequencing revealed a substantial downregulation of AR-regulated AFF3 in CRPC. Overexpression of AFF3 restricted the proliferation and migration of prostate cancer cells whilst also increasing their sensitivity towards enzalutamide, while knockdown of AFF3 had the opposite effect. To elucidate the mechanism of tumor inhibition by AFF3, we applied GSVA and GSEA to investigate the metabolic pathways related to AFF3 and revealed that AFF3 had an impact on fatty acids metabolism and ferroptosis through the regulation of ACSL4 protein expression. Based on correlation analysis and flow cytometry, we can speculate that AFF3 can impact the sensitivity of the CRPC cell lines to the ferroptosis inducer (RSL3) by regulating ACSL4. Therefore, our findings may provide new insights into the mechanisms of drug resistance in CRPC, and AFF3 may serve as a novel prognostic biomarker in prostate cancer.
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高影响因子
Journal of Applied Spectroscopy
·
2025
·
IF 1
Yang Jianlian,Feng Weiwei,Cai Zongqi,Wang Huanqing,Liang Xinghui
Fluorescent dissolved organic matter (FDOM) — particularly tryptophan (Trp), tyrosine (Tyr), and humic acid (HA) — serves as a crucial indicator in environmental monitoring. This study introduced a novel quantitative analysis approach for analyzing three-dimensional excitation–emission matrix spectra (3D-EEMs) of FDOM using convolutional neural networks (CNNs). The performance of the CNN model was evaluated and compared with the self-weighting alternating trilinear decomposition (SWATLD) algorithm. Results revealed that the proposed model significantly outperforms the SWATLD algorithm. Specifically, the CNN model achieved R 2 , RMSE, and MAPE values of 0.964, 0.047, and 14.950%, respectively, while for the SWATLD algorithm, these values were 0.944, 0.062, and 17.439%. Augmentation of the original spectral dataset did not yield a substantial improvement in the performance of the SWATLD algorithm, but it significantly enhanced the prediction ability of the CNN model. This enhancement was evident in the improved R 2 , RMSE, and MAPE values of 0.989, 0.030, and 12.837%, highlighting the critical role of data augmentation in boosting the performance of the CNN model, especially when dealing with a limited dataset. Application of the CNN model to water samples from Laizhou Bay yielded satisfactory results, enabling a simple and rapid analysis of FDOM in seawater. Therefore, an accurate and convenient analytical model was developed based on EEMs and CNNs, which can swiftly determine the concentration of FDOM in the environment and provide valuable references for environmental monitoring and early warning.
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高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·2032-2042
·
IF 2.372
Wang Ying,Shen Shuguang,Li Meina,Sun Yujuan,Li Binbin,Ma Xueping,Zhou Zijian,Guo Chenyuan
Abstract MnO 2 was screened from various metal oxides and different crystal structures of MnO 2 were prepared, which were used to hydrolyze urea process wastewater for energy conservation and environmental protection. The characterizations of XRD, SEM, Raman, FT-IR, XPS and H 2 -TPR were employed and the hydrolysis experiments were carried out, demonstrating that oxygen vacancy on the surface of MnO 2 might be the catalytic activity source on urea hydrolysis. By optimizing reaction influencing factors, the residual urea concentration reduced to 1.61 mg/L over α -MnO 2 , far below the effluent standard. Meanwhile, the temperature of heterogeneous hydrolysis over α-MnO 2 dropped drastically compared with that of thermal hydrolysis. Further, the kinetic parameters of hydrolysis were obtained over α -MnO 2 . And α -MnO 2 also showed excellent recycling ability on the reused test. Graphical Abstract
Effect of different crystal structures MnO2 on urea degradation rate. (Catalyst dosage is 50 g/L, reaction time is 60 min, temperature is 165oC.)
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高影响因子
JOM
·
2020
·Vol. 72
·期 11
·3887-3894
·
IF 2.054
Pang Zhongya,Zou Xingli,Tang Wei,Shi Tianyu,Wang Shujuan,Ji Li,Hsu Hsien-Yi,Xu Qian,Lu Xionggang
Carbide-derived carbon (CDC) as an unconventional porous carbon material has been widely used for various applications. In this work, Ti 3 AlC 2 -derived porous carbon (Ti 3 AlC 2 -CDC) was electrochemically synthesized at 900°C and 3.0 V in molten CaCl 2 -NaCl. The obtained Ti 3 AlC 2 -CDC with abundant slit-like mesopores showed a high specific surface area of 425 m 2 /g. The variation of the morphology from the Ti 3 AlC 2 precursor to Ti 3 AlC 2 -CDC was investigated, with the Ti 3 AlC 2 -CDC demonstrating a typical loose layered morphology and amorphous carbon structure. The intermediate products were also systematically analyzed to investigate the molten salt electrochemical etching process. It was found that Ti 3 AlC 2 can be oxidized by residual O 2− in the molten salt to form tiny Al 2 O 3 particles on the anodic Ti 3 AlC 2 surface during the etching process, then Ti 3 AlC 2 -CDC can be obtained by successively removing these Al 2 O 3 , Al, and Ti from the Ti 3 AlC 2 precursor.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 7
·3482-3489
·
IF 2.2
Yao Weilin,Zhou Yan,Shi Juntao,Chen Zihang,Wang Moxi,Huang Gangyong,Yao Zhujun
TiNb 2 O 7 (TNO) shows high stability and safety, positioning it as a promising candidate for the development of anodes in lithium-ion batteries. Nevertheless, its large-scale application is limited by the sluggish ion and electron transport kinetics within the bulk material. To address this issue, a powerful integrated electrode design is employed to grow TNO nanoparticles on carbon nanotube (CNT) arrays to form NS-C/N-TNO/CNTs. Moreover, biphasic doping including N doping in TNO and N/S codoping in carbon coating on the surface of TNO can be simultaneously achieved via the thermal decomposition of thiourea. Benefiting from the CNT arrays and biphasic doping, the composite possesses enhanced electrical conductivity both outside and inside TNO. Under the influence of the comprehensive advantages mentioned above, the NS-C/N-TNO/CNT composite demonstrates exceptional high-rate performance (352 mA h g −1 at 1 C and 142 mA h g −1 at 30 C).
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 9
·5422-5429
·
IF 1.774
Li Hui,Tong Hua,Zhang Jiefeng,Li Guoqing,Yang Yunxia,Liu Cui,Li Hongbo,Yuan Xiao
Attempts to improve the application performance of noncontact silver (Ag) screen-printing paste for crystalline silicon solar cells, especially in terms of solderability, depend heavily on controlling the properties of the glass additive therein. Taking PbO–B 2 O 3 –SiO 2 – R x O y glasses as an example, this work demonstrates an improvement in the Ag paste due to the R x O y (e.g., ZnO, Bi 2 O 3 , Al 2 O 3 , and MgO) component. The R x O y components were found to help improve the sintering compactness of the Ag paste. The inclusion of the different R x O y components resulted in obvious differences in the soldering state of the sintered Ag grid. Microscopic observations revealed that the soldering state was related to the covering of the solder on the Ag grid and the growth rate of the intermetallic compound Ag 3 Sn during soldering. Comparatively, the sintered Ag grid was soldered more firmly when the glass containing the Bi 2 O 3 or Al 2 O 3 component was used in the Ag paste. This is due to the higher coverage of solder on these Ag grids and the appropriate growth rate of Ag 3 Sn. Considering these findings, the functions of the R x O y components are discussed comprehensively.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 99
·期 2
·420-429
·
IF 2.326
Shen Qiuwan,Jiang Yuhang,Li Shian,Yang Guogang,Zhang Hongpeng,Zhang Zhonggang,Pan Xinxiang
Achieving efficient and stable hydrogen production has always been the focus of the industry, and ethanol steam reforming (ESR) is one of the most reliable, recyclable, and cheap technologies. Perovskite nanocomposite catalysts LaNi x Co 1 − x O 3− δ ( x = 0, 0.5, 0.9) have been prepared by an EDTA-citric acid complexing sol–gel method and used for hydrogen production by ESR. A scanning electron microscopy (SEM), X‐ray diffraction (XRD), EDS and BET were used to characterize the crystal structure of the fresh and the reduced LaNi 0.5 Co 0.5 O 3− δ . The optimal operating parameters of ESR experiments by Ni-doped LaNi x Co 1 − x O 3− δ perovskites were evaluated in detail. Results indicate that the optimum conditions for ESR are as below: reforming temperature is 600 °C; the molar ratio of H 2 O/C 2 H 5 OH is 5:1. In addition, the stable performance of LaNi 0.5 Co 0.5 O 3− δ under the optimal operating condition was examined. Under the optimal reaction conditions, ethanol conversion of LaNi 0.5 Co 0.5 O 3− δ perovskite as an ESR catalyst can reach the highest 90.2%. The results show that LaNi 0.5 Co 0.5 O 3− δ has excellent stability and catalytic activity.
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高影响因子
MEDICINAL CHEMISTRY RESEARCH
·
2019
·Vol. 28
·期 8
·1212-1222
·
IF 1.72
Sheng Li-xin,Huang Jia-yan,Liu Chun-mei,Zhang Ju-zheng,Cheng Ke-guang
A total of 25 targeted hydrogen sulfide donor–pentacyclic triterpene hybrids were designed, synthesized and evaluated on the basis of inspiring reports about hydrogen sulfide donor molecules and oleanolic acid derivatives on anti-tumor activity. The results revealed that only some hybrids ( 10a , 10b , 12a , 12b , 13a , and 15b ) showed moderate anti-proliferation activity against K562 cell line. It indicated that oleanane-type, ( R )-lipoic acid and TBZ groups were much more favorable to the anti-proliferation activity. Furthermore, C-3 OH was more beneficial than C-28/29 COOH in the oleanane-type to the antitumor activity of the batch of ( R )-lipoic acid derivatives. And among them, only compound 13a exhibited moderate anti-proliferation activity against both K562 and K562/ADR cell lines, while it exhibited no anti-proliferation activity against BEL-7402 and L-O2 cell lines. Therefore, it suggested that it was not suitable for hybridization of hydrogen sulfide donors attached to oleanolic acid, ursolic acid and glycyrrhetinic acid in the field of anti-tumor.
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高影响因子
危险品化学品经营许可证（带存储）