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| 1 | Active corrosion protection of super-hydrophobic corrosion inhibitor intercalated Mg-Al layered double hydroxide coating on AZ31 magnesium alloy显示文摘Magnesium alloys,the advanced lightweight structural materials,have been successfully applied in the manufacturing field.Unfortunately,their poor corrosion resistance restrains the potential wide applications.In this work,anti-corrosion coatings were fabricated via the insitu growth of the corrosion inhibitors intercalated magnesium-aluminum layered double hydroxide(Mg-Al LDH)on AZ31 magnesium alloy and then post-sealing it by a super-hydrophobic coating.SEM,XRD,EDS,FTIR,XPS and contact angle test were conducted to analyze physical/chemical features of these coatings.Potentiodynamic polarization curves and electrochemical impedance spectroscopy were recorded to assess the anti-corrosion performance of prepared coatings.Surprisingly,Mg-Al LDH with molybdate intercalation and lauric acid modification achieves the excellent corrosion inhibition performance(99.99%)due to the multicomponent synergistic effect such as the physical protection of Mg-Al LDH,the corrosion inhibition of molybdate and super-hydrophobic properties of lauric acid.This work presents a scientific perspective and novel design philosophy to fabricate the efficient anti-corrosion coating to protect magnesium alloys and then expand their potential applications in other field. | Xin Wang Chuan Jing Yuxiang Chen Xiushuang Wang Gang Zhao Xing Zhang Liang Wu Xiaoying Liu Biqin Dong Yuxin Zhang | 2020 | Journal of Magnesium and Alloys2020，8，1： | 20 |
| 2 | Phosphate limitation increases coenzyme Q10 production in industrial Rhodobacter sphaeroides HY01显示文摘Coenzyme Q10(CoQ10)is an important component of the respiratory chain in humans and some bacteria.As a high-value-added nutraceutical antioxidant,CoQ10 has excellent capacity to prevent cardiovascular disease.The content of CoQ10 in the industrial Rhodobacter sphaeroides HY01 is hundreds of folds higher than normal physiological levels.In this study,we found that overexpression or optimization of the synthetic pathway failed CoQ10 overproduction in the HY01 strain.Moreover,under phosphate-limited conditions(decreased phosphate or in the absence of inorganic phosphate addition),CoQ10 production increased significantly by 12%to220 mg/L,biomass decreased by 12%,and the CoQ10 productivity of unit cells increased by 27%.In subsequent fed-batch fermentation,CoQ10 production reached 272 mg/L in the shake-flask fermentation and 1.95 g/L in a 100-L bioreactor under phosphate limitation.Furthermore,to understand the mechanism associated with CoQ10 overproduction under phosphate-limited conditions,the comparatve transcriptome analysis was performed.These results indicated that phosphate limitation combined with glucose fed-batch fermentation represented an effective strategy for CoQ10 production in the HY01.Phosphate limitation induced a pleiotropic effect on cell metabolism,and that improved CoQ10 biosynthesis efficiency was possibly related to the disturbance of energy metabolism and redox potential. | Lu Zhang Leshi Liu Ke-Feng Wang Lan Xu Liming Zhou Weishan Wang Chuan Li Zheng Xu Tong Shi Haihong Chen Yuanhang Li Hui Xu XiuLiang Yang Zhichun Zhu Biqin Chen Dan Li Guanghuang Zhan Si-Liang Zhang Li-Xin Zhang Gao-Yi Tan | 2019 | Synthetic and Systems Biotechnology2019，4，4： | 2 |
| 3 | Photoaeoustic probe using a microring resonator ultrasonic sensor for endoscopic applications显示文摘 | Dong Biqin Chen Siyu Zhang Zhen | 2014 | Opt Lett2014，39，15： | 1 |
| 4 | Storage, form, and influencing factors of karst inorganic carbon in a carbonate area in China显示文摘Carbonate rock chemical weathering carbon sinks reduce the rate of increase of the atmospheric CO_(2) concentration and global warming. However, uncertainty still exists in the estimation results of carbonate rock chemical weathering carbon sink fluxes(CCSF), and the contributions of climate change and ecological restoration to the CCSF are not clear. To this end, we compiled published site data on ion concentrations in different watersheds in China and used a classical thermodynamic dissolution model to reassess the potential and spatial and temporal patterns of the CCSF in China from 1991 to 2020. We quantified the contributions of temperature(MAT), precipitation(MAP), evapotranspiration(ET), soil water(SM), and the normalized difference vegetation index(NDVI) to the CCSF. The results revealed that(1) China's CCSF was 22.76 t CO_(2)km^(-2)yr^(-1), which was higher than the global average(15.77 t CO_(2)km^(-2)yr^(-1)). The total carbonate rock chemical weathering carbon sink(CCS) was 4772.67×10^(4)t CO_(2), contributing 14.91% of the global CCS through a carbonate rock area of 252.98×10^(4)km^(-2).(2) China's CCSF decreased gradually from southeast to northwest, with values of 33.14, 12.93, and7.27 t CO_(2)km^(-2)yr^(-1)in the southern karst, Qinghai-Tibetan karst, and northern karst regions, respectively.(3) The overall CCSF in China exhibited an increasing trend from 1991 to 2020, with a rate of increase of 0.16 t CO_(2)km^(-2)yr^(-1).(4) The contributions of the MAP, MAT, ET, SM, and NDVI to the CCSF were 63.3%, 3.02%, 27.5%, 3.1%, and 3.05%, respectively. Among them, the increase in precipitation was the main contributor to the increase in the CCSF in China over the last 30 years, while the enhancement of ET offset part of the positive contribution of the increase in precipitation to the CCSF. In conclusion, the results of this study provide a systematic quantification of the magnitude, the patterns, and the influencing factors of CCS over a long time series in China. The results are of great significance and provide a reference for the diagnosis and gap analysis of the national and global carbon neutrality capacities. | Chaochao DU Xiaoyong BAI Yangbing LI Qiu TAN Cuiwei ZHAO Guangjie LUO Luhua WU Fei CHEN Chaojun LI Chen RAN Sirui ZHANG Lian XIONG Fengjiao SONG Biqin XIAO Zilin LI Yingying XUE Mingkang LONG Qing LUO Xiaoyun ZHANG Minghui LI Xiaoqian SHEN Shu YANG | 2024 | Science China Earth Sciences2024，67，3： | 0 |
| 5 | Synthesis of naphthalene derivatives through inexpensive BF_3·Et_2O-catalyzed annulation reaction of arylacetaldehydes with arylalkynes显示文摘An inexpensive BF3·Et2O-catalyzed annulation reaction of arylacetaldehydes with arylalkynes has been developed. Various substituted phenylacetaldehydes and phenylacetylenes can undergo this reaction, producing corresponding α-aryl substituted naphthalene derivatives. Use of inexpensive and readily available BF3 ·Et2O catalyst constitutes the most attractive advantage of this transformation. | XIANG ShiKai HU Hao MA Jing LI YuanZhuo WANG BiQin FENG Chun ZHAO KeQing HU Ping CHEN XiaoZhen | 2013 | Science China Chemistry2013，56，7： | 0 |
| 6 | Screening and engineering of high-activity promoter elements through transcriptomics and red fluorescent protein visualization in Rhodobacter sphaeroides显示文摘The versatile photosyntheticα-proteobacterium Rhodobacter sphaeroides,has recently been extensively engineered as a novel microbial cell factory(MCF)to produce pharmaceuticals,nutraceuticals,commodity chemicals and even hydrogen.However,there are no well-characterized high-activity promoters to modulate gene transcription during the engineering of R.sphaeroides.In this study,several native promoters from R.sphaeroides JDW-710(JDW-710),an industrial strain producing high levels of co-enzyme Q10(Q10)were selected on the basis of transcriptomic analysis.These candidate promoters were then characterized by using gusA as a reporter gene.Two native promoters,Prsp_7571 and Prsp_6124,showed 620%and 800%higher activity,respectively,than the tac promoter,which has previously been used for gene overexpression in R.sphaeroides.In addition,a Prsp_7571-derived synthetic promoter library with strengths ranging from 54%to 3200%of that of the tac promoter,was created on the basis of visualization of red fluorescent protein(RFP)expression in R.sphaeroides.Finally,as a demonstration,the synthetic pathway of Q10 was modulated by the selected promoter T334*in JDW-710;the Q10 yield in shake-flasks increased 28%and the production reached 226 mg/L.These well-characterized promoters should be highly useful in current synthetic biology platforms for refactoring the biosynthetic pathway in R.sphaeroides-derived MCFs. | Tong Shi Lu Zhang Mindong Liang Weishan Wang Kefeng Wang Yue Jiang Jing Liu Xinwei He Zhiheng Yang Haihong Chen Chuan Li Dongyuan Lv Liming Zhou Biqin Chen Dan Li Li-Xin Zhang Gao-Yi Tan | 2021 | Synthetic and Systems Biotechnology2021，6，4： | 0 |
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