179 results on '"Zhiying Yan"'
Search Results
2. CdS Nanoparticles Supported by Cobalt@Carbon-Derived MOFs for the Improved Adsorption and Photodegradation of Ciprofloxacin
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Mi Li, Qin Fang, Yan Lai, Luying Chen, Qiucheng Fu, Jiao He, Yongjuan Chen, Liang Jiang, Zhiying Yan, and Jiaqiang Wang
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CdS/Co@C ,ciprofloxacin oxidation ,metal–organic frameworks ,visible-light photocatalysis ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
The design and synthesis of efficient photocatalysts that promote the degradation of organic pollutants in water have attracted extensive attention in recent years. In this work, CdS nanoparticles are grown in situ on Co@C derived from metal–organic frameworks. The resulting hierarchical CdS/Co@C nanostructures are evaluated in terms of their adsorption and photocatalytic ciprofloxacin degradation efficiency under visible-light irradiation. The results show that, apart from offering a large surface area (55.69 m2·g−1), the prepared material can effectively suppress the self-agglomeration of CdS and enhance the absorption of visible light. The CdS/Co@C-7 composite containing 7% wt Co@C has the highest photodegradation rate, and its activity is approximately 4.4 times greater than that of CdS alone. Moreover, this composite exhibits remarkable stability after three successive cycles of photocatalysis. The enhanced photocatalytic performance is largely ascribed to the rapid separation of electron–hole pairs and the effective electron transfer between CdS and Co@C, which is confirmed via electrochemical experiments and photoluminescence spectra. The active substance capture experiment and the electron spin resonance technique show that h+ is the main active entity implicated in the degradation of CIP, and accordingly, a possible mechanism of CIP photocatalytic degradation over CdS/Co@C is proposed. In general, this work presents a new perspective on designing novel photocatalysts that promote the degradation of organic pollutants in water.
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- 2023
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3. Facile Synthesis of 2D/2D Ti2C3/ZnIn2S4 Heterostructure for Enhanced Photocatalytic Hydrogen Generation
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Yongjuan Chen, Yanfang Ge, Chunling Wu, Hua Tang, Xiu Luo, Jiao He, Liang Jiang, Zhiying Yan, and Jiaqiang Wang
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ZnIn2S4 ,MXene ,Ti2C3 ,photocatalytic ,hydrogen generation ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
ZnIn2S4, a novel two-dimensional visible light-responsive photocatalyst, has attracted much attention in the photocatalytic evolution of H2 under visible light irradiation due to its attractive intrinsic photoelectric properties and geometric configuration. However, ZnIn2S4 still has severe charge recombination, which results in moderate photocatalytic performance. Herein, we report the successful synthesis of 2D/2D ZnIn2S4/Ti3C2 nanocomposites by a facile one-step hydrothermal method. The efficiency of the nanocomposites in photocatalytic hydrogen evolution under visible light irradiation was also evaluated for different ratios of Ti3C2, and the optimal photocatalytic activity was achieved at 5% Ti3C2. Importantly, the activity was significantly higher than that of pure ZnIn2S4, ZnIn2S4/Pt, and ZnIn2S4/graphene. The enhanced photocatalytic activity is mainly due to the close interfacial contact between Ti3C2 and ZnIn2S4 nanosheets, which amplifies the transport of photogenerated electrons and enhances the separation of photogenerated carriers. This research describes a novel approach for the synthesis of 2D MXenes for photocatalytic hydrogen production and expands the utility of MXene composite materials in the fields of energy storage and conversion.
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- 2023
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4. Biotemplated CdS Nano-Aggregate Networks for Highly Effective Visible-Light Photocatalytic Hydrogen Production
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Jiao He, Hongli Zhou, Guo Xiao, Yongjuan Chen, Zhiying Yan, and Jiaqiang Wang
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biotemplate ,photocatalysis ,hydrogen production ,hydrilla ,CdS ,Chemistry ,QD1-999 - Abstract
In the last few decades, many new synthesis techniques have been developed in order to obtain an effective visible-light responsive photocatalyst for hydrogen production by water splitting. Among these new approaches, the biotemplated synthesis method has aroused much attention because of its unique advantages in preparing materials with special morphology and structure. In this work, Hydrilla verticillata (L. f.) Royle was used as a biotemplate to synthesize a CdS photocatalyst. The as-synthesized sample had the microstructure of nano-scaled aggregate networks and its activity for photocatalytic hydrogen production was six times higher than that of CdS synthesized without a template in an Na2S-Na2SO3 sacrificial system. The use of Pt and PdS as cocatalysts further improved the hydrogen production rate to 14.86 mmol/g·h under visible-light (λ ≥ 420 nm) irradiation, so the hydrogen production can be directly observed by the naked eye. The results of characterization showed that the as-synthesized CdS photocatalyst has a high specific surface area and narrow band gap, which is favorable for light absorption and photocatalytic reaction. This work provides a new way to search for efficient visible-light catalysts and confirms the uniqueness of a biotemplated synthesis method in obtaining specially structured materials.
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- 2022
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5. Variation in the Soil Prokaryotic Community Under Simulated Warming and Rainfall Reduction in Different Water Table Peatlands of the Zoige Plateau
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Wei Li, Huai Chen, Zhiying Yan, Gang Yang, Junpeng Rui, Ning Wu, and Yixin He
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prokaryotic communities ,climate change ,water table ,dry-rewetting event ,16S rRNA gene sequencing ,Microbiology ,QR1-502 - Abstract
Climate change and water table drawdown impact the community structure and diversity of peatland soil prokaryotes. Nonetheless, how soil prokaryotes of different water tables respond to climate change remains largely unknown. This study used 16S rRNA gene sequencing to evaluate the variation in soil prokaryotes under scenarios of warming, rainfall reduction, and their combination in different water table peatlands on the Zoige Plateau in China. Stimulated climate change affected some of the diversity indexes and relative abundances of soil prokaryotes in three water table peatlands. Additionally, those from the dry-rewetting event peatland had the most dominant phyla (genera) that showed significant changes in a relative abundance due to the simulated climate change treatments. Regarding functional microbial groups of carbon and nitrogen cycling, simulated climate change did not affect the abundances of the Euryarchaeota, Proteobacteria, Verrucomicrobia, and Methanobacterium in three water table peatlands, except NC10 and Nitrospirae. Redundancy analysis showed that the prokaryotic community variation was primary impacted by site properties of the different water table peatlands rather than the simulated climate change treatments. Moreover, the water table, total carbon, total nitrogen, and soil pH were the primary factors for the overall variation in the soil prokaryotic structure. This study provides a theoretical guidance for management strategies in the Zoige peatland, under climate change scenarios. More attention should be given to the interactive effects of peatland water table drawdown and simulated climate changes for better restorative efforts in water table drawdown, rather than simply adapting to climate change.
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- 2020
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6. Curcumin Doped SiO2/TiO2 Nanocomposites for Enhanced Photocatalytic Reduction of Cr (VI) under Visible Light
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Zhiying Yan, Zijuan He, Mi Li, Lin Zhang, Yao Luo, Jiao He, Yongjuan Chen, and Jiaqiang Wang
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curcumin pigment ,SiO2/TiO2 nanocomposites ,visible photocatalyst ,reduction of Cr (VI) ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
In order to further improve the photocatalytic performance of the SiO2/TiO2 composite under visible light irradiation, curcumin-doped SiO2/TiO2 nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2 during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2 nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2 adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2 nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2 composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2 resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2 and TiO2 in SiO2/TiO2 nanocomposites.
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- 2020
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7. Efficient Charge Carrier Separation in l-Alanine Acids Derived N-TiO2 Nanospheres: The Role of Oxygen Vacancies in Tetrahedral Ti4+ Sites
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Yongjuan Chen, Xiu Luo, Yao Luo, Peiwen Xu, Jiao He, Liang Jiang, Junjie Li, Zhiying Yan, and Jiaqiang Wang
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N-doped TiO2 ,tetrahedral Ti4+ sites ,photocatalytic ,l-alanine acids ,time-resolved IR spectroscopy ,Chemistry ,QD1-999 - Abstract
N-doped TiO2 with oxygen vacancies exhibits many advantages for photocatalysis, such as enhanced visible light absorbency, inhibition of the photogenerated charge carrier recombination, etc. However, preparation of N-doped TiO2 with oxygen vacancies under mild conditions is still a challenge. Herein, N-doped TiO2 nanospheres with tetrahedral Ti4+ sites were synthesized by using dodecylamine as template and assisted by l-alanine acids. The obtained samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV−Vis diffuse reflectance spectra (UV−Vis DRS). It was found that the dodecylamine as a neutral surfactant controlled the structure of TiO2 spherical, while l-alanine acids provided a nitrogen source. The existence of tetrahedral Ti4+ sites in N-doped TiO2 was also confirmed. The N-doped TiO2 sample with tetrahedral Ti4+ sites exhibited significantly improved photocatalytic performance for degradation of methylene blue solution under UV light or visible light irradiation. A combined time-resolved infrared (IR) spectroscopy study reveals that the enhanced photocatalytic performance could be attributed to a large amount of photogenerated charge carriers and efficient charge separation. It is demonstrated that the shallow donor state produced by oxygen vacancies of tetrahedral Ti4+ sites can effectively promote separation of charge carriers besides capturing electrons.
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- 2019
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8. Liquid-Phase Catalytic Oxidation of Limonene to Carvone over ZIF-67(Co)
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Yizhou Li, Yepeng Yang, Daomei Chen, Zhifang Luo, Wei Wang, Yali Ao, Lin Zhang, Zhiying Yan, and Jiaqiang Wang
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liquid-phase catalytic oxidation ,limonene ,carvone ,zeolitic imidazolate frameworks ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Liquid-phase catalytic oxidation of limonene was carried out under mild conditions, and carvone was produced in the presence of ZIF-67(Co), cobalt based zeolitic imidazolate framework, as catalyst, using t-butyl hydroperoxide (t-BHP) as oxidant and benzene as solvent. As a heterogeneous catalyst, the zeolitic imidazolate framework ZIF-67(Co) exhibited reasonable substrate–product selectivity (55.4%) and conversion (29.8%). Finally, the X-ray diffraction patterns of the catalyst before and after proved that ZIF-67(Co) acted as a heterogeneous catalyst, and can be reused without losing its activity to a great extent.
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- 2019
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9. Highly Efficient Red Cabbage Anthocyanin Inserted TiO2 Aerogel Nanocomposites for Photocatalytic Reduction of Cr(VI) under Visible Light
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Haiyan Yang, Liang Jiang, Yizhou Li, Guoqing Li, Yepeng Yang, Jiao He, Jiaqiang Wang, and Zhiying Yan
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Red cabbage pigment ,anthocyanin ,TiO2 aerogel ,photocatalytic activity ,Chemistry ,QD1-999 - Abstract
In sharp contrast to conventional photosensitization methods in which the organic pigments were often adsorbed, herein we present a study on natural vegetable pigment inserted TiO2 aerogel nanocomposites and we directly use red cabbage anthocyanin (RCP) as a structure-directing agent. It was found that pure TiO2 aerogel nanocomposite did not exhibit any meaningful activity for photocatalytic reduction of Cr(VI). However, the photocatalytic reduction activity was greatly improved by the RCP inserted TiO2 aerogel nanocomposites under visible-light irradiation, which was approximately 2- and 12.3-fold higher than that of TiO2 aerogel conventionally photosensitized by RCP and pure TiO2 aerogel nanocomposites, respectively. It also exhibited good stability and could be reused at least three times without losing a significant amount of its activity.
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- 2018
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10. Low-Temperature Sol-Gel Synthesis of Nitrogen-Doped Anatase/Brookite Biphasic Nanoparticles with High Surface Area and Visible-Light Performance
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Liang Jiang, Yizhou Li, Haiyan Yang, Yepeng Yang, Jun Liu, Zhiying Yan, Xiang Long, Jiao He, and Jiaqiang Wang
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anatase/brookite biphasic ,nitrogen-doping ,sol-gel method ,visible light photocatalysis ,degradation of dyes ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Nitrogen doping in combination with the brookite phase or a mixture of TiO2 polymorphs nanomaterials can enhance photocatalytic activity under visible light. Generally, nitrogen-dopedanatase/brookite mixed phases TiO2 nanoparticles obtained by hydrothermal or solvothermal method need to be at high temperature and with long time heating treatment. Furthermore, the surface areas of them are low (
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- 2017
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11. Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation
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Zhiying Yan, Jiao He, Lei Guo, Yueting Li, Deliang Duan, Yongjuan Chen, Junjie Li, Fagui Yuan, and Jiaqiang Wang
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titanium silicon oxides ,biotemplates ,aquatic plants ,photocatalysis ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
The biotemplating technique is an environmental-protective high-efficiency new technology by which the resulting TiO2 may simultaneously attain the duplication of structure and self-doping elements from biotemplate materials, which is highly desirable for photocatalytic applications. In this paper, aquatic plant leaves—including reed, water hyacinth, and duckweed—were used as both templates and silicon precursors to successfully synthesize biomorphic TiO2/SiO2 composite with mesoporous structures. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 adsorption–desorption, and UV–visible diffuse reflectance spectra were applied to characterize the microstructures of the samples. The results show that all TiO2/SiO2 composites are mainly composed of an anatase phase with mesoporous structure and possess high specific surface area. Compared with commercial Degussa P25 TiO2, all TiO2/SiO2 samples display intensive light-harvesting efficiency, particularly in the visible light range. The activities were evaluated by using gentian violet as a target for photocatalytic degradation experiments under simulated solar irradiation. The TiO2/SiO2 samples templated by reed and water hyacinth leaves exhibit high activity, while the TiO2/SiO2 samples obtained from duckweed are inferior to P25 in the degradation of gentian violet. A synergistic effect of SiO2 incorporation and structural construction through biotemplating is proposed to be beneficial to photocatalytic activity.
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- 2017
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12. Polymerization of Alkylsilanes on ZIF-8 to Hierarchical Siloxane Microspheres and Microflowers
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Lin Yang, Congjia Xie, Yizhou Li, Lei Guo, Minfang Nie, Jinping Zhang, Zhiying Yan, Jiaqiang Wang, and Wei Wang
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ZIF-8 ,composite materials ,polymerization of alkylsilane ,siloxane microflowers ,fabrication of MOF ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
The use of metal-organic frameworks (MOFs) in the polymerization field remains comparatively rare up to now, let alone studies on the fabrication of polymer microstructures through a MOFs-catalyzed assembly process. Zeolitic imidazolate framework-8 (ZIF-8), a well-known MOF for its chemical and thermal stabilities, was used to induce a polymerization reaction of saturated alkylsilanes for the first time. The reaction temperature was found to be critical for morphology control of the polymerized ZIF-siloxane composites. The polymerization of alkylsilanes by ZIF-8 at room temperature resulted in siloxane microspheres while rose petal-like microstructures were obtained at higher temperature. The effects of the reaction time on the structures of the polymerization products were also investigated and the polymerization reaction process was proposed. This work expands the field of MOFs’ applications and develops a reasonable method for the multidimensional assembly of MOFs building blocks into required structures or platforms for designing new kinds of hierarchical morphologies, which to our knowledge has not been previously investigated.
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- 2017
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13. Comparison of seven chemical pretreatments of corn straw for improving methane yield by anaerobic digestion.
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Zilin Song, GaiheYang, Xiaofeng Liu, Zhiying Yan, Yuexiang Yuan, and Yinzhang Liao
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Medicine ,Science - Abstract
Agriculture straw is considered a renewable resource that has the potential to contribute greatly to bioenergy supplies. Chemical pretreatment prior to anaerobic digestion can increase the anaerobic digestibility of agriculture straw. The present study investigated the effects of seven chemical pretreatments on the composition and methane yield of corn straw to assess their effectiveness of digestibility. Four acid reagents (H2SO4, HCl, H2O2, and CH3COOH) at concentrations of 1%, 2%, 3%, and 4% (w/w) and three alkaline reagents (NaOH, Ca(OH)2, and NH3·H2O) at concentrations of 4%, 6%, 8%, and 10% (w/w) were used for the pretreatments. All pretreatments were effective in the biodegradation of the lignocellulosic straw structure. The straw, pretreated with 3% H2O2 and 8% Ca(OH)2, acquired the highest methane yield of 216.7 and 206.6 mL CH4 g VS(-1) in the acid and alkaline pretreatments, which are 115.4% and 105.3% greater than the untreated straw. H2O2 and Ca(OH)2 can be considered as the most favorable pretreatment methods for improving the methane yield of straw because of their effectiveness and low cost.
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- 2014
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14. Visible-Light Degradation of Dyes and Phenols over Mesoporous Titania Prepared by Using Anthocyanin from Red Radish as Template
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Zhiying Yan, Wenjuan Gong, Yongjuan Chen, Deliang Duan, Junjie Li, Wei Wang, and Jiaqiang Wang
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Renewable energy sources ,TJ807-830 - Abstract
Heterogeneous photocatalysis is able to operate effectively to eliminate organic compounds from wastewater in the presence of semiconductor photocatalyst and a light source. Although photosensitization of titania by organic dyes is one of the conventional ways for visible-light utilization of titania, previous studies have not yet addressed the use of natural food coloring agents as templates in the synthesis of mesostructured materials, let alone the simultaneous achievement of highly crystalline mesoscopic framework and visible-light photocatalytic activity. In this work, anthocyanin, a natural pigment from red radish was directly used as template in synthesis of highly crystalline mesoporous titania. The synthesized mesoporous titania samples were characterized by a combination of various physicochemical techniques, such as XRD, SEM, HRTEM, nitrogen adsorption/desorption, and diffuse reflectance UV-Vis. The prepared mesoporous titania photocatalyst exhibited significant activity under visible-light irradiation for the degradation of dyes and phenols due to its red shift of band-gap-absorption onset and visible-light response as a result of the incorporation of surface carbon species.
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- 2014
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15. Surface sulphur vacancies of CdS/MIL-68(In)–NH2 for Boosting Visible-Light photocatalytic hydrogen evolution
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Wang, Yutian, Li, Xue, Mei, Ting, Chen, Yongjuan, He, Jiao, Jiang,Zhiying Yan, Liang, and Wang, Jiaqiang
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- 2024
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16. LncRNA-NEAT1 inhibits the occurrence and development of pancreatic cancer through spongy miR-146b-5p/traf6
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Feifei Wei, Zhiying Yan, Xianming Zhang, Yaoyao Wang, MiaoJing Wang, Yingwei Zhu, and Kequn Xu
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Bioengineering ,Molecular Biology ,Biotechnology - Published
- 2023
17. Comparison of Residual Generation under Multilevel Fine Model of Permanent Magnet Synchronous Motor
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Zhipeng Wang, Wei Yu, Chenglin Wen, Zhiying Yan, Xu Zhang, and Yungang Zhou
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- 2022
18. Bio-inspired V-TiO2 architectures with regulable surface ultrastructure for visible-light photocatalytic selective oxidation of cyclohexane
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Hongli Zhou, Ying Shao, Zizhen Zhou, Yun Yang, Jiao He, Liang Jiang, Daomei Chen, Yongjuan Chen, Zhiying Yan, and Jiaqiang Wang
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General Physics and Astronomy ,Surfaces and Interfaces ,General Chemistry ,Condensed Matter Physics ,Surfaces, Coatings and Films - Published
- 2023
19. Mechanism of microbiologically induced calcite precipitation for cadmium mineralization
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Yong Zeng, Zezhi Chen, Qingyang Lyu, Xiuxiu Wang, Yaling Du, Chenchen Huan, Yang Liu, and Zhiying Yan
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Environmental Engineering ,Metals, Heavy ,Environmental Chemistry ,Chemical Precipitation ,Calcium ,Pollution ,Waste Management and Disposal ,Urease ,Cadmium ,Calcium Carbonate - Abstract
Microbiologically induced calcite precipitation (MICP) technology shows potential for remediating heavy metal pollution; however, the underlying mechanism of heavy metal mineralization is not well-understood, limiting the application of this technology. In this study, we targeted Cd contamination (using 15:1, 25:1, and 50:1 Ca
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- 2022
20. Microbiologically induced calcite precipitation for in situ stabilization of heavy metals contributes to land application of sewage sludge
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Yong Zeng, Zezhi Chen, Qingyang Lyu, Yapeng Cheng, Chenchen Huan, Xinru Jiang, Zhiying Yan, and Zhouliang Tan
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Environmental Engineering ,Sporosarcina ,Lead ,Sewage ,Health, Toxicology and Mutagenesis ,Metals, Heavy ,Environmental Chemistry ,Pollution ,Waste Management and Disposal ,Urease ,Cadmium ,Calcium Carbonate - Abstract
Microbiologically induced calcite precipitation (MICP) has shed new light on solving the problem of in situ stabilization of heavy metals (HMs) in sewage sludge before land disposal. In this study, we examined whether MICP treatment can be integrated into a sewage sludge anaerobic digestion-land application process. Our results showed that MICP treatment not only prevented the transfer of ionic-state Cd from the sludge to the supernatant (98.46 % immobilization efficiency) but also reduced the soluble exchangeable Pb and Cd fractions by up to 100 % and 48.54 % and increased the residual fractions by 22.54 % and 81.77 %, respectively. In addition, the analysis of the stability of HMs in MICP-treated sludge revealed maximum reductions of 100 % and 89.56 % for TCLP-extractable Pb and Cd, respectively. Three-dimensional fluorescence, scanning electron microscopy-energy-dispersive X-ray spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy analyses confirmed the excellent performance of the ureolytic bacteria Sporosarcina ureilytica ML-2 in the sludge system. High-throughput sequencing showed that the relative abundance of Sporosarcina sp. reached 53.18 % in MICP-treated sludge, and the urease metabolism functional genes unit increased by a maximum of 239.3 %. The MICP technology may be a feasible method for permanently stabilizing HMs in sewage sludge before land disposal.
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- 2022
21. Modular configurations of living biomaterials incorporating nano-based artificial mediators and synthetic biology to improve bioelectrocatalytic performance: A review
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Zheng, Chen, Jing, Zhang, Qingyang, Lyu, Honghui, Wang, Xiaoliang, Ji, Zhiying, Yan, Fang, Chen, Randy A, Dahlgren, and Minghua, Zhang
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Environmental Engineering ,Bioelectric Energy Sources ,Extracellular electron transfer ,Biocompatible Materials ,Electroactive biofilms ,Photocatalytic ,Pollution ,Conductive nanomaterials heterojunctions ,Electron Transport ,Bioelectrochemical systems ,Affordable and Clean Energy ,Biofilms ,Environmental Chemistry ,Synthetic Biology ,Waste Management and Disposal ,Electrodes ,Environmental Sciences ,Biotechnology - Abstract
Currently, the industrial application of bioelectrochemical systems (BESs) that are incubated with natural electrochemically active microbes (EABs) is limited due to inefficient extracellular electron transfer (EET) by natural EABs. Notably, recent studies have identified several novel living biomaterials comprising highly efficient electron transfer systems allowing unparalleled proficiency of energy conversion. Introduction of these biomaterials into BESs could fundamentally increase their utilization for a wide range of applications. This review provides a comprehensive assessment of recent advancements in the design of living biomaterials that can be exploited to enhance bioelectrocatalytic performance. Further, modular configurations of abiotic and biotic components promise a powerful enhancement through integration of nano-based artificial mediators and synthetic biology. Herein, recent advancements in BESs are synthesized and assessed, including heterojunctions between conductive nanomaterials and EABs, in-situ hybrid self-assembly of EABs and nano-sized semiconductors, cytoprotection in biohybrids, synthetic biological modifications of EABs and electroactive biofilms. Since living biomaterials comprise a broad range of disciplines, such as molecular biology, electrochemistry and material sciences, full integration of technological advances applied in an interdisciplinary framework will greatly enhance/advance the utility and novelty of BESs. Overall, emerging fundamental knowledge concerning living biomaterials provides a powerful opportunity to markedly boost EET efficiency and facilitate the industrial application of BESs to meet global sustainability challenges/goals.
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- 2022
22. The value of miR-510 in the prognosis and development of colon cancer
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Xianming Zhang, Junjie Hang, Kequn Xu, Zhiying Yan, Feifei Wei, and Yingwei Zhu
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0301 basic medicine ,Poor prognosis ,Colorectal cancer ,miR-510 ,migration ,03 medical and health sciences ,0302 clinical medicine ,Downregulation and upregulation ,medicine ,Stage (cooking) ,Gene knockdown ,business.industry ,Cell growth ,Disease progression ,General Medicine ,medicine.disease ,digestive system diseases ,cell proliferation ,030104 developmental biology ,colon cancer ,Cell culture ,030220 oncology & carcinogenesis ,Cancer research ,Medicine ,prognosis ,business ,Research Article - Abstract
Purpose Colon cancer is one of the malignant tumors that threatens human health. miR-510 was demonstrated to play roles in the progression of various cancers; its dysregulation was speculated to be associated with the development of colon cancer. Methods One hundred and thirteen colon cancer patients participated in this research. With the help of RT-qPCR, the expression of miR-510 in collected tissues and cultured cells was analyzed. The association between miR-510 expression level and clinical features and prognosis of patients was evaluated. Moreover, the effects of miR-510 on cell proliferation, migration, and invasion of colon cancer were assessed by CCK8 and Transwell assay. Results miR-510 significantly upregulated in colon cancer tissues and cell lines relative to the adjacent normal tissues and colonic cells. The expression of miR-510 was significantly associated with the TNM stage and poor prognosis of patients, indicating miR-510 was involved in the disease progression and clinical prognosis of colon cancer. Additionally, the upregulation of miR-510 significantly promoted cell proliferation, migration, and invasion of colon cancer, while its knockdown significantly inhibited these cellular processes. SRCIN 1 was the direct target of miR-510 during its promoted effect on the development of colon cancer. Conclusion The upregulation of miR-510 acts as an independent prognostic indicator and a tumor promoter by targeting SRCIN 1 in colon cancer, which provides novel therapeutic strategies for colon cancer.
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- 2021
23. Bioconversion of agricultural waste into poly-γ-glutamic acid in solid-state bioreactors at different scales
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Lishang Xu, Fang Junnan, Yang Liu, Zhiying Yan, and Huan Chenchen
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China ,Bacillus amyloliquefaciens ,biology ,Moisture ,Chemistry ,Bioconversion ,020209 energy ,Soybean meal ,02 engineering and technology ,010501 environmental sciences ,biology.organism_classification ,Pulp and paper industry ,01 natural sciences ,Bioreactors ,Polyglutamic Acid ,Stalk ,Fermentation ,0202 electrical engineering, electronic engineering, information engineering ,Bioreactor ,Aeration ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
With the purpose of developing a novel approach of agricultural waste treatment and overcoming bottlenecks for upscaling solid-state fermentation processes, the type of aerated, continuously stirred solid-state bioreactors were used for the production of γ-PGA by Bacillus amyloliquefaciens JX-6. Using corn stalk and soybean meal, the most common agricultural waste in China, as solid substrates, the maximum production of γ-PGA was 116.88 ± 5.05 g/kg and 102.48 ± 3.30 g/kg in 50 L and 150 L bioreactors, respectively. Production of γ-PGA in 50 L bioreactor was higher than in 150 L bioreactor, demonstrating that a reduction in γ-PGA production occurred as the fermentation system enlarged. An analysis of the interactions among fermentation parameters (temperature, moisture, and pH), γ-PGA production, solid substrates and bacterial communities indicated that different bioreactor capacities caused changes in fermentation parameters and bacterial communities, which in turn affected substrate utilization and γ-PGA production. Overall, obtaining considerable amounts of γ-PGA under non-sterilized fermentation expressed that JX-6 has excellent abilities to adapt to these substrates and conditions. Bioconversion of agricultural waste into γ-PGA in scale-up fermentation was successfully conducted by creating a more stable and suitable fermentation environment in bioreactors.
- Published
- 2020
24. Performance Evaluation of H2s and Nh3 Removal by Biological Trickling Filter Reactors with Various Fillers Under Heterotrophic Conditions
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Chenchen Huan, Zhenhong Wang, Xinyu Tong, Yong Zeng, Yang Liu, Yapeng Cheng, Qingyang Lyu, Zhiying Yan, and Xueping Tian
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
25. Nitrogen Removal Characteristics of the Highly Efficient Heterotrophic Nitrification-Aerobic Denitrification Bacterium Hy-1 and Practical Application in Biological Deodorization
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Chenchen Huan, Jiang Sun, Yang Liu, Yong Zeng, Wei Qin, Yapeng Cheng, Xueping Tian, Zhouliang Tan, Qingyang Lyu, and Zhiying Yan
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
26. The influence of anxiety on weight perception
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Zhiying YAN, Peng LI, and Xuyan CHEN
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General Psychology - Published
- 2023
27. Enhanced Bio-Electro-Fenton degradation of phenolic compounds based on a novel Fe–Mn/Graphite felt composite cathode
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Honghua Jia, Ping Wei, Jun Zhou, Zhiying Yan, Chen Tang, Xiao-Na Liu, Xiaoyu Yong, Xiayuan Wu, and Biao Li
- Subjects
Environmental Engineering ,Iron ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,Composite number ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Catalysis ,Hydrolysate ,law.invention ,chemistry.chemical_compound ,Phenols ,law ,Electrochemistry ,Vanillic acid ,Environmental Chemistry ,Graphite ,Electrodes ,0105 earth and related environmental sciences ,Manganese ,Public Health, Environmental and Occupational Health ,Hydrogen Peroxide ,General Medicine ,General Chemistry ,Syringic acid ,Pollution ,Cathode ,020801 environmental engineering ,chemistry ,Degradation (geology) ,Nuclear chemistry - Abstract
Phenolic compounds are problematic byproducts generated from lignocellulose pretreatment. In this study, the feasibility degradation of syringic acid (SA), vanillic acid (VA), and 4-hydroxybenzoic acid (HBA) by Bio-Electro-Fenton (BEF) system with a novel Fe–Mn/graphite felt (Fe–Mn/GF) composite cathode were investigated. The nano-scale Fe–Mn multivalent composite catalyst with core shell structure distributed more evenly on GF surface to form a catalyst layer with higher oxygen reduction reaction performance. Accordingly, the maximum power density generated with Fe–Mn/GF cathode was 48.1% and 238.9% higher than Fe/GF and GF respectively, which further enhanced the in situ generation of H2O2 due to the superiority of nano-scale core shell structure and synergistic effect of Fe and Mn species. The degradation efficiency of the three phenolic compounds in the BEF system could reached 100% after optimization of influencing parameters. Furthermore, a possible SA degradation pathway by BEF process in the present system was proposed based on the detected intermediates. These results demonstrated an efficient approach for the degradation of phenolic compounds derived from lignocellulose hydrolysates.
- Published
- 2019
28. Nitrogen removal characteristics of efficient heterotrophic nitrification-aerobic denitrification bacterium and application in biological deodorization
- Author
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Chenchen, Huan, Zhiying, Yan, Jiang, Sun, Yang, Liu, Yong, Zeng, Wei, Qin, Yapeng, Cheng, Xueping, Tian, Zhouliang, Tan, and Qingyang, Lyu
- Subjects
Environmental Engineering ,Bacteria ,Sewage ,Nitrogen ,Renewable Energy, Sustainability and the Environment ,Nitrogen Dioxide ,Heterotrophic Processes ,Bioengineering ,General Medicine ,Nitrification ,Aerobiosis ,Carbon ,Denitrification ,Waste Management and Disposal ,Nitrites - Abstract
A heterotrophic nitrifying aerobic denitrifying (HN-AD) strain HY-1 with excellent capacity, identified as Paracoccus denitrificans, was isolated from activated sludge. HY-1 was capable of removing NH
- Published
- 2022
29. Inward-to-outward assembly of amine-functionalized carbon dots and polydopamine to Shewanella oneidensis MR-1 for high-efficiency, microbial-photoreduction of Cr(VI)
- Author
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Jian Li, Feng Wang, Jing Zhang, Honghui Wang, Chongyuan Zhao, Lielin Shu, Peng Huang, Yejing Xu, Zhiying Yan, Randy A. Dahlgren, and Zheng Chen
- Subjects
Chromium ,Shewanella ,Indoles ,Environmental Engineering ,Polymers ,Amine-functionalized carbon dots ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Hexavalent chromium ,NAD ,Biohybrid ,Pollution ,Carbon ,Flavins ,Cytochromes ,Meteorology & Atmospheric Sciences ,Environmental Chemistry ,Amines ,Oxidation-Reduction ,Environmental Sciences ,Photoelectrons - Abstract
A novel photosensitized living biohybrid was fabricated by inward-to-outward assembly of amine-functionalized carbon dots (NCDs) and polydopamine (PDA) to Shewanella oneidensis MR-1 and applied for high-efficiency, microbial-photoreduction of Cr(VI). Within a 72h test period, biohybrids achieved a pronounced catalytic reduction capacity (100%) for 100mg/L Cr(VI) under visible illumination, greatly surpassing the poor capacity (only 2.5%) displayed by the wild strain under dark conditions. Modular configurations of NCDs and PDA afforded biohybrids with a large electron flux by harvesting extracellular photoelectrons generated from illuminated NCDs and increasing reducing equivalents released from an enlarged intracellular NADH/NAD+ pool. Further, increased production of intracellular c-type cytochromes and extracellular flavins resulting from the modular configuration enhanced the biohybrid electron transport ability. The enhancement of electron transport was also attributed to more conductive conduits at NCDs-PDA junction interfaces. Moreover, because NCDs are highly reductive, the enhanced Cr(VI) reduction was also attributed to direct reduction by the NCDs and the direct Cr(VI) reduction by sterile NCDs-assembled biohybrid was up to 20% in the dark. Overall, a highly efficient strategy for removal/transformation of Cr(VI) by using NCD-assembled photosensitized biohybrids was proposed in this work, which greatly exceeded the performance of Cr(VI)-remediation strategies based on conventional microbial technologies.
- Published
- 2022
30. Aspirin Regulates Gemcitabine Resistance in Pancreatic Cancer via Inhibiting the PI3K/Akt/mTOR Signaling Pathway and Reversing Epithelial-mesenchymal Transition
- Author
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Zhiying Yan, Xianming Zhang, Feifei Wei, xiao yun, yi liu, Hanyu Zhou, Muhan Liu, Yingwei Zhu, and Kequn xu
- Subjects
Aspirin ,Chemistry ,MTOR signaling pathway ,Pancreatic cancer ,Cancer research ,medicine ,Gemcitabine resistance ,Epithelial–mesenchymal transition ,medicine.disease ,Protein kinase B ,PI3K/AKT/mTOR pathway ,medicine.drug - Abstract
Background: Gemcitabine is considered a classical agent for the treatment of patients with pancreatic cancer. However, gemcitabine resistance is a common cause of treatment failure, leading to poor survival. Therapy to overcome gemcitabine resistance would benefit patients with pancreatic cancer. This study investigated the impact of aspirin (ASA) to gemcitabine resistance in the biological function of pancreatic cancer cells and the potential mechanism. Methods: The MTT assay, wound healing assay and annexin V-FITC/PI test was used to determine whether ASA could inhibit gemcitabine resistance in pancreatic cancer cells. Besides, the expression of Bcl-2, Bax, E-cadherin, Vimentin, p-PI3K, p-AKT and p-mTOR was detected by the Western blot. Statistically significant differences between groups were determined with the Student’s t-test. Results: The proliferation and migration of SW1990 and BxPC3 cells were significantly decreased while the apoptosis rate was increased in the combination of ASA and gemcitabine group (pppConclusion: Our research provided evidence ASA could help to inhibit gemcitabine resistance of pancreatic cancer cells, probably via inhibiting the PI3K/AKT/mTOR pathway and reversing EMT. Thus, combined use of ASA and gemcitabine is expected to be a potential therapeutic strategy for pancreatic cancer patients.
- Published
- 2021
31. Melampsora spondylitis presenting with unexplained low back pain: A case report
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Weijian Zhu, Sirui Zhou, Zhihao Xu, Zhiying Yang, and Jinming Zhang
- Subjects
Melampsora ,Fungal spondylitis ,Treatments ,Infectious and parasitic diseases ,RC109-216 - Abstract
Background: Spondylitis is a spinal infection which has been increasing in susceptible populations globally. This disease is caused by various microorganisms. Fungal spondylitis is rare in clinical practice and is strongly associated with immunosuppression and diabetes. Here, we report a case of suspected ca Melampsora spondylitis. Case presentation: A patient was suspected with Melampsora spondylitis at the L3-S1 level. The patient received two surgical operations and antifungal treatments. The next-generation sequencing (NGS) analysis of the tissue specimen obtained during the two surgical procedures confirmed the diagnosis of Melampsora spondylitis. The patient was successfully treated with voriconazole, vancomycin, and meropenem following surgical debridement with pedicle screw internal fixation. Conclusion: The diagnosis of fungal spondylitis is often delayed or missed. Physicians should consider fungal spondylitis in the differential diagnosis of neck pain to facilitate early treatment and prevent spinal cord injury and disability. Although fungal infections often occur in immunocompromised patients, fungal spondylitis has also been reported in immunocompetent patients in recent years. In addition, Candida albicans is usually considered a common bacterium in fungal spondylitis. This case underscores the need to develop more advanced diagnostic and therapeutic techniques to identify the pathogenic bacteria associated with fungal spondylitis besides Candida albicans.
- Published
- 2024
- Full Text
- View/download PDF
32. Increased fermentative adenosine production by gene-targeted Bacillus subtilis mutation
- Author
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Biao Li, Xiayuan Wu, Ping Wei, Jun Zhou, Xiao-Na Liu, Xiaoyu Yong, Honghua Jia, and Zhiying Yan
- Subjects
0106 biological sciences ,0301 basic medicine ,Adenosine ,Mutant ,Guanosine ,Bioengineering ,Bacillus subtilis ,01 natural sciences ,Applied Microbiology and Biotechnology ,Adenylosuccinate Synthase ,03 medical and health sciences ,chemistry.chemical_compound ,Inosine Monophosphate ,010608 biotechnology ,medicine ,Carbon-Nitrogen Ligases ,Inosine ,Gene ,biology ,Chemistry ,Adenylosuccinate synthase ,General Medicine ,biology.organism_classification ,Adenosine Monophosphate ,030104 developmental biology ,Biochemistry ,Fermentation ,Gene Targeting ,Mutation ,Mutagenesis, Site-Directed ,biology.protein ,Nucleoside ,Biotechnology ,medicine.drug - Abstract
Adenosine, which is produced mainly by microbial fermentation, plays an important role in the therapy of cardiovascular disease and has been widely used as an antiarrhythmic agent. In this study, guanosine 5′-monophosphate (GMP) synthetase gene (guaA) was inactivated by gene-target manipulation to increase the metabolic flux from inosine 5′-monophosphate (IMP) to adenosine in B. subtilis A509. The resulted mutant M3-3 showed an increased adenosine production from 7.40 to 10.45 g/L, which was further enhanced to a maximum of 14.39 g/L by central composite design. As the synthesis of succinyladenosine monophosphate (sAMP) from IMP catalysed by adenylosuccinate synthetase (encoded by purA gene) is the rate-limiting step in adenosine synthesis, the up-regulated transcription level of purA was the potential underlying mechanism for the increased adenosine production. This work demonstrated a practical strategy for breeding B. subtilis strains for industrial nucleoside production.
- Published
- 2019
33. UiO-66 with confined dyes for adsorption and visible-light photocatalytic reduction of aqueous Cr(VI)
- Author
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Jiao He, Hongli Zhou, Qiumin Peng, Yutian Wang, Yongjuan Chen, Zhiying Yan, and Jiaqiang Wang
- Subjects
Inorganic Chemistry ,Materials Chemistry ,Physical and Theoretical Chemistry - Published
- 2022
34. Production of poly-γ-glutamic acid (γ-PGA) from xylose-glucose mixtures by Bacillus amyloliquefaciens C1
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Ping Wei, Jun Zhou, Wang Yajun, An Wei, Chen Tang, Zhiying Yan, Jia-Dong Sun, and Xiaoyu Yong
- Subjects
Bacillus amyloliquefaciens ,biology ,Chemistry ,Catabolite repression ,Lignocellulosic biomass ,Environmental Science (miscellaneous) ,Xylose ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Hydrolysate ,Diauxic growth ,chemistry.chemical_compound ,Xylose metabolism ,Fermentation ,Food science ,Biotechnology - Abstract
Due to the promising applications, the demand to enhance poly-γ-glutamic acid (γ-PGA) production while decreasing the cost has increased in the past decade. Here, xylose/glucose mixture and corncob hydrolysate (CCH) was evaluated as alternatives for γ-PGA production by Bacillus amyloliquefaciens C1. Although both have been validated to support cell growth, glucose and xylose were not simutaneously consumed and exhibited a diauxic growth pattern due to carbon catabolite repression (CCR) in B. amyloliquefaciens C1, while the enhanced transcription of araE alleviated the xylose transport bottleneck across a cellular membrane. Additionally, the xyl operon (xylA and xylB), which was responsible for xylose metabolism, was strongly induced by xylose at the transcriptional level. When cultured in a mixed medium, xylR was sharply induced to 3.39-folds during the first 8-h while reduced to the base level similar to that in xylose medium. Finally, pre-treated CCH mainly contained a mixture of glucose and xylose was employed for γ-PGA fermentation, which obtained a final concentration of 6.56 ± 0.27 g/L. Although the glucose utilization rate (84.91 ± 1.81%) was lower than that with chemical substrates, the xylose utilization rate (43.41 ± 2.14%) and the sodium glutamate conversion rate (77.22%) of CCH were acceptable. Our study provided a promising approach for the green production of γ-PGA from lignocellulosic biomass and circumvent excessive non-food usage of glucose.
- Published
- 2021
35. Study on anaerobic co-digestion of municipal sewage sludge and fruit and vegetable wastes: Methane production, microbial community and three-dimension fluorescence excitation-emission matrix analysis
- Author
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Xinru, Jiang, Yandong, Xie, Minggang, Liu, Shiyu, Bin, Yang, Liu, Chenchen, Huan, Gaosheng, Ji, Xinhui, Wang, Zhiying, Yan, and Qingyang, Lyu
- Subjects
Environmental Engineering ,Sewage ,Renewable Energy, Sustainability and the Environment ,Microbiota ,Bioengineering ,General Medicine ,Fluorescence ,Bioreactors ,Biofuels ,Fruit ,Vegetables ,Humans ,Digestion ,Anaerobiosis ,Methane ,Waste Management and Disposal - Abstract
Constantly increased sewage sludge (SS) and fruit and vegetable wastes (FVW) are becoming the major organic solid wastes in human society. Thus, anaerobic digestion is employed as a low carbon energy strategy to reduce their environmental pollution risk. Anaerobic co-digestion system was developed based on the carbon to nitrogen ratio strategy. Results showed that the daily biogas production was higher in co-digester, and the volumetric biogas production rate (VBPR) significantly enhanced for 1.3 ∼ 3 folds, and the highest VBPR was 2.04 L/L • day with optimal OLR of 2.083 Kg L
- Published
- 2022
36. Surface Defect Detection of Steel Plate Based on SKS-YOLO
- Author
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Shiyang Zhou, Siming Ao, Zhiying Yang, and Huaiguang Liu
- Subjects
Surface defect detection ,YOLO ,attention mechanism ,anchor frames ,loss function ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
During the production process of steel plate, surface defect detection is crucial for high-quality products. For the existing defect detection method based on machine vision, there are various types of problems, such as large model calculations, low detection accuracy and difficulties of recognizing small defect targets. To reduce and solve these issues, the paper proposes a new defect detection model, simplified kernel and squeeze on a you only look once network (SKS-YOLO), which can achieve rapid and effective defect detection on steel plate. Firstly, it adopts EfficientNetv2 as the backbone, significantly reducing model calculations and accelerating training speed while maintaining accuracy. Subsequently, the atrous spatial pyramid pooling (ASPP) module is utilized to obtain a larger receptive field, extracting more feature information from surface defects. The integration of the squeeze excitation network (SE-Net) attention mechanism enhances capabilities of feature extraction furtherly. Then, the K-means algorithm is applied to cluster and obtain more suitable anchor frames for defect targets. It not only increases the number of positive samples, but also expedites model convergence. Finally, the loss function of simplified intersection over union (SIoU) is used to enhance the ability of model to locate and detect surface defect targets. The experimental results show that the mean average precision (mAP) is 89.40% at a detection speed of 55 frames per second (FPS), which is better than the state-of-the-art (SOTA) detection models.
- Published
- 2024
- Full Text
- View/download PDF
37. Curcumin Doped SiO2/TiO2 Nanocomposites for Enhanced Photocatalytic Reduction of Cr (VI) under Visible Light
- Author
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Luo Yao, Zhiying Yan, Jiaqiang Wang, Yongjuan Chen, Zijuan He, Lin Zhang, Mi Li, and Jiao He
- Subjects
Anatase ,Materials science ,Diffuse reflectance infrared fourier transform ,reduction of Cr (VI) ,02 engineering and technology ,010402 general chemistry ,lcsh:Chemical technology ,01 natural sciences ,curcumin pigment ,Catalysis ,lcsh:Chemistry ,SiO2/TiO2 nanocomposites ,X-ray photoelectron spectroscopy ,lcsh:TP1-1185 ,Physical and Theoretical Chemistry ,Spectroscopy ,Nanocomposite ,Dopant ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,lcsh:QD1-999 ,Photocatalysis ,0210 nano-technology ,visible photocatalyst ,Nuclear chemistry ,Visible spectrum - Abstract
In order to further improve the photocatalytic performance of the SiO2/TiO2 composite under visible light irradiation, curcumin-doped SiO2/TiO2 nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2 during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2 nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2 adsorption&ndash, desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2 nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2 composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2 resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2 and TiO2 in SiO2/TiO2 nanocomposites.
- Published
- 2020
38. The heterologous expression and characterization of a novel chitinase with dual catalytic domains discovered from a wetland soil metagenome
- Author
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Yumei Dai, Feng Yang, Xiao Liu, Hongling Wang, and Zhiying Yan
- Abstract
Background: Microbial chitinases have attracted a lot of attention because of their great potential in many applications. Metagenome-based approach obtains the target genes from the environment directly without culturing the microbes and is becoming a powerful tool to discover the novel chitinases.Results: Gene P1724 was found in a chitin-enriched microbial community from a wetland on the Qinghai-Tibetan plateau using the metagenomic approach. The translated protein sequence of P1724 was predicted to have two GH18 catalytic domains and showed very low similarities with any known and hypothetical chitinases. The gene sequence of P1724 , its N-terminal GH18 domain ( P1724nGH18 ), or C-terminal GH18 domain ( P1724cGH18 ) was cloned and expressed in Escherichia coli BL21 (DE3). Using colloid chitin as substrate, these purified recombinant chitinases showed maximum hydrolytic activities at 40 °C, pH 5.0-6.0 and 0-0.5 M NaCl, and were cold adaptive since they were still active at 4 °C; the activities of three chitinases were decreased with the presence of Cu 2+ and EDTA, but increased with Ba 2+ and Ca 3+ ; all three chitinases showed both chitotiosidase and endochitinase activities, and could hydrolyze chitosan as well. Other than these common characteristics, P1724 and P1724nGH18 shared more similarity in temperature and pH stabilities, NaCl tolerance and substrate affinity, suggesting the N-terminal GH18 domain contributed more than the C-terminal GH18 did in biochemical characteristics of P1724. k cat / K m value (catalytic efficiency) of P1724 was significantly higher than the sum values of P1724nGH18 and P1724cGH18, which indicated that two GH18 domains of P1724 worked cooperatively in degrading chitin.Conclusion: Compared to most microbial chitinases that contain only one catalytic domain, P1724 contains two and was firstly discovered by the metagenomic approach. P1724, its N-terminal and C-terminal catalytic domains were heterologously expressed and characterized. These three recombinant chitinases are phylogenetically distant to any chitinases studied so far, have unique hydrolytic mode, high catalytic efficiency and so new promising candidates for chitinases in applications. In addition, this study broadens the knowledge of unknown chitinases in nature and shows a natural strategy for enzyme engineering by adding other catalytic domain(s).
- Published
- 2020
39. Cloning, Purification, and Characterization of a Novel Metagenome-Sourced Microbial Chitinase with Dual Catalytic Domains
- Author
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Yumei Dai, Feng Yang, Xiao Liu, Hongling Wang, and Zhiying Yan
- Abstract
Background: Microbial chitinases have attracted a lot of attention because of their great potential in many applications. Metagenome-based approach obtains the target genes from the environment directly without culturing the microbes and is becoming a powerful tool to discover the novel chitinases. Results: A metagenomic approach was used to discover the chitinases from a wetland on the Qinghai-Tibetan plateau. Gene P1724 was found and predicted to have two GH18 catalytic domains. Gene sequence containing P1724 , only its N-terminal GH18 domain ( P1724nGH18 ) or only C-terminal GH18 domain ( P1724cGH18 ) were cloned and expressed in Escherichia coli BL21 (DE3). These purified recombinant chitinases showed maximum hydrolytic activities at 40 °C, pH 5.0-6.0 and 0-0.5 M NaCl, and were cold adaptive since they were still active at 4 °C. The activities of three chitinases were decreased with the presence of Cu 2+ and EDTA, but increased with Ba 2+ and Ca 3+ . All three chitinases showed both chitotiosidase and endochitinase activities, and produced predominantly N, N΄-Diacetylchitobiose from colloid chitin. Other than these common characteristics, P1724 and P1724nGH18 shared more similarity in temperature and pH stabilities, NaCl tolerance and substrate affinity, suggesting the N-terminal GH18 domain contributed more than the C-terminal GH18 did in biochemical characteristics of P1724. k cat / K m value (catalytic efficiency) of P1724 was significantly higher than the sum values of P1724nGH18 and P1724cGH18’s, which indicated that two GH18 domains of P1724 works synergistically in degrading chitin. Conclusion: Compared to the most of microbial chitinases containing only one catalytic domain, chitinases P1724 with two GH18 catalytic domains was discovered firstly by the metagenomic approach. P1724 is a novel chitinase with unique amino acid sequences and hydrolytic mode, and could be used in cold environments or industries.
- Published
- 2020
40. Improvement of sewage sludge anaerobic digestion through synergistic effect combined trace elements enhancer with enzyme pretreatment and microbial community response
- Author
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Xinru Jiang, Zhiying Yan, Ji Gaosheng, Qingyang Lyu, Xu Lishan, Xie Yandong, Liefeng Bi, Huan Chenchen, and Yang Liu
- Subjects
Environmental Engineering ,Health, Toxicology and Mutagenesis ,Methane ,chemistry.chemical_compound ,Bioreactors ,Environmental Chemistry ,Anaerobiosis ,Food science ,Enhancer ,chemistry.chemical_classification ,Sewage ,biology ,Microbiota ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,biology.organism_classification ,Pollution ,Trace Elements ,Anaerobic digestion ,Enzyme ,chemistry ,Microbial population biology ,Fermentation ,Sludge ,Bacteria - Abstract
In this study, a double E strategy (enzymes and enhancer) characterized by high efficiency for enhancing sewage sludge anaerobic digestion (AD) is proposed. This strategy combines addition of trace elements (TEs) enhancer and enzyme pretreatment, inducing a synergistic effect on AD, and it is more effective and economical compared with TEs addition or enzyme pretreatment in isolation. When adding 400 U/g cocktail enzymes and 1.24% trance elements enhancers, the cumulative methane production and the maximum daily methane increased yield by 45.29% and 84.7%, respectively. According to microbial community analysis, the double E strategy significantly motivate the growth of acetogens and protein fermenting bacterium. The relative abundance of Fermentimonas and Lutispora increased by 6.15% and 5.4%, respectively. Archaeal community analysis and changes in the mcrA gene abundance demonstrate enrichment of hydrogenotrophic methanogens, with the methanogens exhibiting high vitalities and stress resistance. The double E strategy could be a promising way to improve industrial sewage sludge AD efficiency.
- Published
- 2022
41. A Comprehensive Overview of the Fundamental and Applications of Metaverse
- Author
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Zhiying Yan
- Subjects
General Medicine - Abstract
Nowadays, Metaverse is very popular around the world. People read a lot of news reports about the metaverse every day. In many people’s minds, the metaverse may be the future of humanity. Most investors prefer to invest companies which have some relationship with Metaverse products. However, how metaverse would fully integrate into our lives is still unclear, and there are numerous proposed solutions in the market. In order to evaluate the feasibility of metaverse applications, we will focus on what Metaverse is, the existing Semi-Metaverse attempt, the existing Metaverse application and the Metaverse university that the CUHKSZ’s students made in this paper. Besides, we will also talk about the potential risks that the Metaverse may bring. At the end, we illustrate what Metaverse need to prepare and improve in the future. If Metaverse can be realized in the future, it will bring infinite convenience to human life. However, it is still very difficult to fully realize Metaverse depending on today’s science and technology.
- Published
- 2022
42. 消极前情绪对积极情绪感染的调节:反向与降阈——以教学情境为例
- Author
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Zhiying Yan and Qiyong Zhang
- Subjects
Antecedent (behavioral psychology) ,Emotional contagion ,Descent (aeronautics) ,Psychology ,Negative emotion ,General Psychology ,Cognitive psychology - Published
- 2018
43. The study of simultaneous desulfurization and denitrification process based on the key parameters
- Author
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Zhiying Yan, Xiang Li, Na Li, Xueying Zhang, Weiguo Tu, Yanmeng Huang, Yong Zeng, Qin Cao, Min Tang, Yuexiang Yuan, and Jun Zhou
- Subjects
0106 biological sciences ,Denitrification ,Chemistry ,Bioengineering ,010501 environmental sciences ,Ph changes ,01 natural sciences ,Applied Microbiology and Biotechnology ,Biochemistry ,Economic benefits ,Flue-gas desulfurization ,chemistry.chemical_compound ,Chemical engineering ,010608 biotechnology ,Denitrification process ,Sulfate ,0105 earth and related environmental sciences ,Stable state ,Polyurethane - Abstract
The impacts of different S/N molar ratios and fillers (polyurethane foam, multi-surface hollow spheres, and pall rings) on the process of simultaneous desulfurization and denitrification (SDD) were studied by using anaerobic biotrickling filer (BTF). Furthermore, the SDD mechanism was described by dividing the SDD process into three stages based on pH changes: (I) increase (II) decrease and (III) stable state. The maximum desulfurization and denitrification efficiency (13.5 g-S m−3 h−1 and 3.7 g-N m−3 h−1, respectively) was achieved by applying polyurethane foam as filler. When S2− and S0 coexist as electron donors in the SDD system, the functional microbes degrade S2− preferentially. The S/N molar ratios of the influent were higher, and the relative content of sulfate in the products was less. Considering the efficiency and economic benefits, polyurethane foam is suggested as fillers for practical implementations of SDD systems. The S/N molar ratios should be controlled in a 5/3 to 5/2 range and HS−/S2− concentration should be
- Published
- 2018
44. Changes in methane oxidation ability and methanotrophic community composition across different climatic zones
- Author
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Xu Wang, Ning Wu, Linfang Du, Zhiying Yan, Huai Chen, Lile Zeng, Jianqing Tian, and Yan Shen
- Subjects
biology ,Methanotroph ,Methane monooxygenase ,Chemistry ,Stratigraphy ,Atmospheric methane ,Temperate forest ,04 agricultural and veterinary sciences ,010501 environmental sciences ,01 natural sciences ,Deciduous ,Environmental chemistry ,Anaerobic oxidation of methane ,Soil water ,040103 agronomy & agriculture ,biology.protein ,0401 agriculture, forestry, and fisheries ,Tropical and subtropical moist broadleaf forests ,0105 earth and related environmental sciences ,Earth-Surface Processes - Abstract
Microbial oxidation by bacteria with the potential to oxidize C1 compounds (methanotrophs) is the only biological sink for atmospheric methane (CH4). Aerobic methanotrophs are particularly active in forest soils, but the role of aerobic methanotrophs in native forest soils in China remains poorly understood. The pmoA gene, encoding the key enzyme methane monooxygenase (particulate MMO), is widely used to identify methanotrophic communities. We collected soils from different vegetation types in one subtropical and one temperate forest in China. Potential CH4 oxidation rates and methanotroph communities were assessed via laboratory incubation and pmoA-based phylogenetic analysis, respectively. Across all sampling sites, we observed distinct variations in methanotroph community composition and CH4 oxidation rates. In all soils, CH4 oxidation rates increased with increasing CH4 concentration. Elevated temperature resulted in an increase in the CH4 oxidation rates in coniferous forests, while a decrease in deciduous forests. Restriction fragment length polymorphism analyses indicated that methantrophic community varied in different vegetation types. The methanotroph communities were dominated by type II methanotrophs (including soil cluster alpha (SCα), Methylocystis, and USCα) and type I methanotrophs (including USCγ and Methylobacter) in deciduous and coniferous forests, respectively. It is suggested that intrinsic differences in CH4 oxidation rate responses to temperature between coniferous and deciduous soils are likely due to different methanotroph community structures. Taken together, the direction of CH4 feedback responses to disturbance was site specific.
- Published
- 2018
45. Biogas Production and Microbial Community Dynamics during the Anaerobic Digestion of Rice Straw at 39–50 °C: A Pilot Study
- Author
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Jun Zhou, Ping Wei, Xiaoyu Yong, Zhenzhen Tian, Jingyuan Liu, Xiayuan Wu, Zhiying Yan, Honghua Jia, and Qing Yu
- Subjects
020209 energy ,General Chemical Engineering ,food and beverages ,Energy Engineering and Power Technology ,02 engineering and technology ,Rice straw ,010501 environmental sciences ,Pulp and paper industry ,01 natural sciences ,Anaerobic digestion ,Fuel Technology ,Biogas ,Microbial population biology ,Yield (chemistry) ,0202 electrical engineering, electronic engineering, information engineering ,Bioreactor ,Environmental science ,0105 earth and related environmental sciences ,Biogas production - Abstract
The purpose of this study was to investigate the anaerobic digestion (AD) of rice straw at different temperatures in a 300 m3 bioreactor. The results showed that the biogas yield was 401.9 m3/ton (...
- Published
- 2018
46. Hydrothermal pretreatment on the anaerobic digestion of washed vinegar residue
- Author
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Genzhu Ran, Xiaofeng Liu, Qin Cao, Dong Li, Tao Zheng, Lin Chen, and Zhiying Yan
- Subjects
0106 biological sciences ,Environmental Engineering ,Methanogenesis ,Bioengineering ,010501 environmental sciences ,01 natural sciences ,Methane ,Hydrolysis ,chemistry.chemical_compound ,Bioreactors ,010608 biotechnology ,Hemicellulose ,Anaerobiosis ,Food science ,Leachate ,Waste Management and Disposal ,Acetic Acid ,0105 earth and related environmental sciences ,Waste management ,Renewable Energy, Sustainability and the Environment ,Thermophile ,Temperature ,General Medicine ,Anaerobic digestion ,chemistry ,Mesophile - Abstract
The aim of this work was to study the acetate separation from fresh vinegar residue (FVR) to avoid inhibition of methanogenesis and hydrothermal treatment on washed vinegar residue (WVR) to enhance methane production. The optimal liquid-solid ratio was 10:1mL/g for the washing of FVR. The methane yields of the FVR, WVR, and washed leachate (WL) were 273L/kgVS, 199L/kgVS, and 306.9L/kgCOD, respectively. The optimal hydrothermal temperature was 160°C for WVR, with maximum methane yield of 258.38L/kgVS. Hydrothermal pretreatment destroyed the structure of lignocellulose and improved the hydrolysis of hemicellulose. Compared with thermophilic digestion of FVR, thermophilic digestion of 160°C treated FVR, and thermophilic digestion of WVR with mesophilic digestion of WL, the thermophilic digestion of 160°C treated WVR with mesophilic digestion of WL obtained the maximum total methane yield of 102.5L/kgFVR.
- Published
- 2018
47. Multi-omics reveal the structure and function of microbial community in co-digestion of corn straw and pig manure
- Author
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Fang Junnan, Xinru Jiang, Min Wang, Xinhui Wang, Zhiying Yan, Qingyang Lyu, and Yang Liu
- Subjects
biology ,Renewable Energy, Sustainability and the Environment ,Methanogenesis ,Chemistry ,Strategy and Management ,food and beverages ,Building and Construction ,Methanosaeta concilii ,Straw ,biology.organism_classification ,Manure ,Industrial and Manufacturing Engineering ,Microbial population biology ,Metagenomics ,Abundance (ecology) ,Food science ,Clostridium stercorarium ,General Environmental Science - Abstract
Metagenomic sequencing, basing on whole genomic analysis, was carried out to explain the taxonomic and functional patterns of microbial communities in co-digestion and mono-digestions with corn straw and pig manure. Bacteroides graminisolvens and Clostridium stercorarium, the dominant species for corn straw degradation, and Proteiniphilum acetatigenes, emphasizing on protein decomposition, performed the optimum abundance during the co-digestion to improve efficiency of substrate decomposition. Methanosaeta concilii was the richest species during the process of bio-methane production, whose quantity and status in co-digestion were better than in mono-digestion. Analysis of functional patterns indicated that the carbohydrate-active enzymes in co-digestion were sustained abundant resulting short lag time, and the abundance of enzymes involving in methanogenesis were extremely high in co-digestion indicating the active methane metabolism. An adequate understanding of taxonomic and functional patterns further revealed the mechanism of rapid startup and superb methane production in co-digestion.
- Published
- 2021
48. Where There Is My Hometown There Is My Heart: The Construction of Hometown Complex of Yunnan People Grounded Theory Analysis
- Author
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Zhiying, Yan, primary, Jie, Song, additional, Xueying, Li, additional, and Shaofen, Wu, additional
- Published
- 2021
- Full Text
- View/download PDF
49. Microbiologically induced calcite precipitation technology for mineralizing lead and cadmium in landfill leachate
- Author
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Yaling Du, Ziyi Yang, Zezhi Chen, Zhiying Yan, Qingyang Lyu, Yong Zeng, and Yang Liu
- Subjects
Calcite ,Technology ,Cadmium ,Environmental Engineering ,biology ,Environmental remediation ,chemistry.chemical_element ,General Medicine ,Management, Monitoring, Policy and Law ,biology.organism_classification ,Sporosarcina pasteurii ,Calcium Carbonate ,chemistry.chemical_compound ,Bioremediation ,Lead ,chemistry ,Ammonium ,Leachate ,Waste Management and Disposal ,Water Pollutants, Chemical ,Microbiologically induced calcite precipitation ,Nuclear chemistry - Abstract
As a new bioremediation technology for toxic metals, microbiologically induced calcite precipitation (MICP) is gradually becoming a research focus. This study investigated the application of MICP to mineralize toxic metals (lead and cadmium) in landfill leachate for the first time. In the experiment of remediating synthetic landfill leachate (SLL) contaminated by Pb2+, 100% of the 20 mg/L Pb2+ was removed when the maximum urease activity was only 20.96 U/ml. Scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) and laser particle size characterizations of the precipitates indicate the formation of agglomerated square particles, 76.9% of which had sizes that ranged from 33.93 to 57.06 μm. Fourier transform infrared spectroscopic and X-ray diffraction analyses confirmed that the precipitates consisted predominantly of calcite crystals, and the unit cell lattice constants of the precipitates (a = b = 4.984 A, c = 17.171 A) matched those of calcite, while lead was fixed as hydrocerussite. In addition, the Pb-MICP precipitates were stable under continuous acid degradation (pH = 5.5), and only 1.76% of the lead was released after 15 days. In the verification test of toxic metals remediation in a real landfill leachate (RLL), all of the Pb2+ and Cd2+ (initial concentrations: Pb2+ = 25 mg/L; Cd2+ = 5.6205 mg/L) was mineralized simultaneously, which further confirmed the feasibility of MICP for toxic metal remediation in landfill leachate. However, optimizing the urea dosage and combining the ammonium recovery are necessary strategies required for improving the economic and environmental benefits of the MICP process.
- Published
- 2021
50. Analyses of deodorization performance of mixotrophic biotrickling filter reactor using different industrial and agricultural wastes as packing material
- Author
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Ji Gaosheng, Yang Liu, Li Haihong, Qingyang Lyu, Xu Lishan, Xinru Jiang, Yong Zeng, Tong Xinyu, Huan Chenchen, and Zhiying Yan
- Subjects
Comamonas ,Air Pollutants ,Environmental Engineering ,biology ,Chemistry ,ved/biology ,Health, Toxicology and Mutagenesis ,Trickling filter ,ved/biology.organism_classification_rank.species ,Straw ,biology.organism_classification ,Pulp and paper industry ,Nitrification ,Pollution ,Thiobacillus ,Filter (aquarium) ,Cinder ,Biodegradation, Environmental ,Bioreactors ,Biofilms ,Aerobic denitrification ,Environmental Chemistry ,Waste Management and Disposal ,Filtration - Abstract
In this study, to efficiently remove malodorous gas and reduce secondary pollution under mixotrophic conditions, pine bark, coal cinder, straw and mobile bed biofilm reactor (MBBR) fillers were used as packing materials in a biological trickling filter (BTF) to simultaneously treat high-concentration H2S and NH3. The results showed that the removal rate of BTF-A filled with pine bark was the highest, which was 86.31% and 94.06% under the H2S and NH3 loading rates of 53.59 g/m³·h while the empty bed residence time (EBRT) was 40.5 s. The theoretical maximum load was obtained by fitting the kinetic curve, and the value were 90.09 g H2S m-³·h−1 and 172.41 g NH3 m-³·h−1. Meanwhile, after treating with 720 ppm of NH3, the average concentration of NO3- in the BTF circulating fluid was only 127.58 mg/L, indicating the better performance of secondary pollutants control. Microbiological analysis showed that Dokdonella, Micropruina, Candidatus_Alysiosphaera, Nakamurella and Thiobacillus possessed high abundance at the genus level, and their entire percentage in four BTF reactors were 62.87%, 46.32%, 47.98%, and 57.35% respectively. It is worthwhile that the genera Comamonas and Trichococcus with heterotrophic nitrification and aerobic denitrification capabilities and proportion of 3.66%, 1.45%, 5.43%, and 3.23% were observed in four reactors.
- Published
- 2021
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