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Conversion of LiPSs Accelerated by Pt-Doped Biomass-Derived Hyphae Carbon Nanobelts as Self-Supporting Hosts for Long-Lifespan Li-S Batteries

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Energy & Environmental Materials 2024年第3期7卷 49-58页

作者： Fengfeng Han liwen fan Xinzhi Ma Huiqing Lu Lu Li Xitian Zhang Lili Wu Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province School of Life Science and TechnologyHarbin Normal UniversityHarbin 150025China

Rechargeable Li-S batteries(LSBs)are emerging as an important alternative to lithium-ion batteries(LIBs),owing to their high energy densities and low cost;yet sluggish redox kinetics of LiPSs results in inferior cycle ***,we prepared multifunctional self-supporting hyphae carbon nanobelt(HCNB)as hosts by carbonization of hyphae balls of Rhizopus,which could increase the S loading of the cathode without sacrificing reaction *** platinum(Pt)nanoparticles were introduced into HCNBs(PtHCNBs)by ion-beam sputtering *** on the X-ray photoelectron spectroscopy analyses,the introduced trace Pt regulated the local electronic states of heteroatoms in *** kinetics investigation combined with operando Raman measurements revealed the accelerated reaction mechanics of sulfur *** from the synergistic catalytic effect and the unique structures,the as-prepared PtHCNB/MWNCT/S cathodes delivered a stable capacity retention of 77%for 400 cycles at 0.5 C with a sulfur loading of 4.6 mg cm^(-2).More importantly,remarkable cycling performance was achieved with an high areal S loading of 7.6 mg cm^(-2).This finding offers a new strategy to prolong the cycle life of LSBs.

关键词： high areal capacity high S loading hyphae carbon nanobelt lithium-sulfur battery operando Raman

Efficient adsorption separation of methane from C_(2)-C_(3) hydrocarbons in a Co(Ⅱ)-nodes metal-organic framework

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Chinese Journal of Chemical Engineering 2024年第5期69卷 192-198页

作者： Jie Zhang Xingzhe Guo Bing Lin Guangzu Xiong Hanshuang Wang Min Zhang liwen fan Bingwen Li Shuisheng Chen Department of Chemistry and Chemical Engineering Taiyuan Institute of TechnologyTaiyuan 030008China Engineering Research Center of Oligosaccharides Fuyang Normal UniversityFuyang 236041China Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China

Methane(CH_(4))as a substitute for other mineral fuels plays a crucial role in reducing energy consumption and preventing environmental *** present study employs a solvothermal method to fabricate a porous framework Co-metal-organic framework(Co-MOF)containing two distinct secondary building units(SBUs):an anionic[Co_(2)(μ_(2)-OH)(COO)_(4)(H_(2)O)]and a neutral[CoN_(2)(COO)_(2)].Notably,within the anionic SBUs,the coordinated water molecules induce the generation of divergent unsaturated Co(Ⅱ)centers in the unidirectional porous channels,thereby creating open metal *** adsorption performance of Co-MOF towards pure component gases was systematically *** results demonstrated that Co-MOF exhibits superior adsorption capacity for C_(2)-C_(3) hydrocarbons compared to CH_(4),which offers the potential for efficient adsorption and separation of CH_(4) from C_(2)-C_(3) *** gas selectivity separation ratios of Co-MOF for C_(2)H_(6)/CH_(4) and C_(3)H_8/CH_(4) were calculated using the ideal adsorbed solution theory method at 273/298 K and 0.1 *** results revealed that Co-MOF achieved remarkable equilibrium separation selectivity for CH_(4) and C_(2)-C_(3) hydrocarbon gases among non-modified MOFs,signifying the potential of the synthesized Co-MOF for efficient recovery and purification of CH_(4) from C_(2)-C_(3) *** experiments further demonstrate the ability of Co-MOF to purify methane from C_(2)-C_(3) hydrocarbons in practical gas separation ***,molecular simulation calculations further substantiate the propensity of anionic SBUs to interact with C_(2)-C_(3) hydrocarbon *** study provides a novel paradigm for the development of porous MOF materials in the application of gas mixture separation.

关键词： Co-MOF Separation hydrocarbons Dynamic breakthrough curves Molecular simulations adsorbent Monte Carlo simulation

Directed evolution of a neutrophilic and mesophilic methanol dehydrogenase based on high-throughput and accurate measurement of formaldehyde

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Synthetic and Systems Biotechnology 2023年第3期8卷 386-395页

作者： Jin Qian liwen fan Jinxing Yang Jinhui Feng Ning Gao Guimin Cheng Wei Pu Wenjuan Zhou Tao Cai Shuang Li Ping Zheng Jibin Sun Depei Wang Yu Wang College of Biotechnology Tianjin University of Science and TechnologyTianjin300222China Haihe Laboratory of Synthetic Biology Tianjin300308China Key Laboratory of Engineering Biology for Low-carbon Manufacturing Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin300308China National Technology Innovation Center of Synthetic Biology Tianjin300308China University of Chinese Academy of Sciences Beijing100049China School of Biology and Biological Engineering South China University of TechnologyGuangzhou510006China

Methanol is a promising one-carbon feedstock for biomanufacturing,which can be sustainably produced from carbon dioxide and natural ***,the efficiency of methanol bioconversion is limited by the poor catalytic properties of nicotinamide adenine dinucleotide(NAD^(+))-dependent methanol dehydrogenase(Mdh)that oxidizes methanol to ***,the neutrophilic and mesophilic NAD^(+)-dependent Mdh from Bacillus stearothermophilus DSM 2334(Mdh_(Bs))was subjected to directed evolution for enhancing the catalytic *** combination of formaldehyde biosensor and Nash assay allowed high-throughput and accurate measurement of formaldehyde and facilitated efficient selection of desired ***_(Bs)variants with up to 6.5-fold higher K_(cat)/K_(M)value for methanol were screened from random mutation *** T153 residue that is spatially proximal to the substrate binding pocket has significant influence on enzyme *** beneficial T153P mutation changes the interaction network of this residue and breaks theα-helix important for substrate binding into two shortα-*** the interaction network of T153 with surrounding residues may represent a promising strategy to further improve Mdh_(Bs),and this study provides an efficient strategy for directed evolution of Mdh.

关键词： Methanol dehydrogenase Formaldehyde biosensor Directed evolution C1 bioconversion Methanol oxidation Methylotrophy

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马赫-曾德尔电光调制器工作点自动控制

中国激光 2014年第9期41卷 123-127页

作者：樊理文孟洲孙乔孙世林国防科学技术大学光电科学与工程学院湖南长沙410073

为实现马赫-曾德尔(MZ)电光强度调制器(EOIM)工作点的实时控制,提出一种基于虚拟仪器技术的工作点自动控制方案。采用闭环反馈控制系统,引入微扰动信号,通过"扫描—鉴相补偿"的方法,可以使自动控制工作点长时间锁定于传输曲线的最低点... 详细信息

为实现马赫-曾德尔(MZ)电光强度调制器(EOIM)工作点的实时控制,提出一种基于虚拟仪器技术的工作点自动控制方案。采用闭环反馈控制系统,引入微扰动信号,通过"扫描—鉴相补偿"的方法,可以使自动控制工作点长时间锁定于传输曲线的最低点。当激光器输出功率为6mW,控制EOIM在1h内稳定于最低点,实验测得EOIM输出平均光功率1.198μW,标准差0.123μW,波动小于0.43μW;在EOIM最低点外加电脉冲信号进行调制时,产生消光比均值达25.71dB的光脉冲。输出脉冲消光比与未加控制时相比提高9.94dB,波动小于0.5dB,大大提高了MZ电光调制器的工作稳定性。

关键词：光学器件工作点自动控制虚拟仪器马赫-曾德尔电光调制器

Engineering of cofactor preference and catalytic activity of methanol dehydrogenase by growth-coupled directed evolution

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Green Carbon 2024年第2期2卷 242-251页

作者： Jinxing Yang liwen fan Guimin Cheng Tao Cai Jibin Sun Ping Zheng Shuang Li Yu Wang School of Biology and Biological Engineering South China University of TechnologyGuangzhou 510006China Haihe Laboratory of Synthetic Biology Tianjin 300308China Key Laboratory of Engineering Biology for Low-Carbon Manufacturing Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin 300308China National Technology Innovation Center of Synthetic Biology Tianjin 300308China College of Biotechnology Tianjin University of Science and TechnologyTianjin 300222China

Methanol,produced from carbon dioxide,natural gas,and biomass,has drawn increasing attention as a promising green carbon feedstock for biomanufacturing due to its sustainable and energy-rich *** adenine dinucleotide(NAD^(+))-dependent methanol dehydrogenase(MDH)catalyzes the oxidation of methanol to formaldehyde via NADH generation,providing a highly active C1 intermediate and reducing power for subsequent ***,the unsatisfactory catalytic efficiency and cofactor bias of MDH significantly impede methanol valorization,especially in nicotinamide adenine dinucleotide phosphate(NADP^(+))-dependent ***,we employed synthetic NADH and NADPH auxotrophic Escherichia coli strains as growth-coupled selection platforms for the directed evolution of MDH from Bacillus stearothermophilus DSM *** or NADPH generated by MDH-catalyzed methanol oxidation enabled the growth of synthetic cofactor auxotrophs,establishing a positive correlation between the cell growth rate and MDH *** this principle,MDH mutants exhibiting a 20-fold improvement in catalytic efficiency(k_(cat)/K_(m))and a 90-fold cofactor specificity switch from NAD^(+)to NADP+without a decrease in specific enzyme activity,were efficiently screened from random and semi-rationally designed *** envision that these mutants will advance methanol valorization and that the synthetic cofactor auxotrophs will serve as versatile selection platforms for the evolution of NAD(P)^(+)-dependent enzymes.

关键词： Growth-coupled screening Methanol dehydrogenase Cofactor engineering Directed evolution C1 bioconversion

术后化疗对早期肺大细胞神经内分泌肿瘤患者生存期的影响

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中国肿瘤临床 2017年第4期44卷 169-172页

作者：韩轲范力文赵珩上海交通大学附属胸科医院胸外科上海市200030 湖北省十堰市人民医院胸外科

目的:探讨术后化疗对早期肺大细胞神经内分泌肿瘤(large cell neuroendocrine carcinoma,LCNEC)患者生存期的影响。方法:回顾性分析2008年1月至2014年12月在上海交通大学附属胸科医院50例行肺癌根治性切除及系统性淋巴结清扫LCNEC患者... 详细信息

目的:探讨术后化疗对早期肺大细胞神经内分泌肿瘤(large cell neuroendocrine carcinoma,LCNEC)患者生存期的影响。方法:回顾性分析2008年1月至2014年12月在上海交通大学附属胸科医院50例行肺癌根治性切除及系统性淋巴结清扫LCNEC患者的临床资料,根据术后是否接受化疗将50例患者分为化疗组(n=32)和非化疗组(n=18)。随访其生存状况。结果:化疗组和非化疗组中位生存时间分别为48个月和29个月,5年总生存率分别为72.5%和35.6%。单因素及多因素Cox分析均表明:术后辅助化疗为LCNEC患者OS的预后影响因素(P=0.005;HR=0.281,P=0.008)。结论:术后化疗可提高早期LCNEC术后患者的远期生存率。

关键词：肺大细胞神经内分泌肿瘤外科手术术后化疗总生存期

马赫-曾德尔电光调制器产生等幅光频梳的工作点控制研究

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光学学报 2014年第B12期34卷 385-392页

作者：樊理文胡晓阳孙乔孟洲国防科学技术大学光电科学与工程学院湖南长沙410073

提出一种利用马赫曾德尔（MZ）电光调制器（EOM）产生多波长光源的方案。深入分析了EOM在单频微波信号调制下的扩频特性，仿真了其频域产生光边带的情况，得出在调制度C=1.84时可实现等频率间隔、边模抑制比（SMSR）为15 dB的五阶等幅... 详细信息

提出一种利用马赫曾德尔（MZ）电光调制器（EOM）产生多波长光源的方案。深入分析了EOM在单频微波信号调制下的扩频特性，仿真了其频域产生光边带的情况，得出在调制度C=1.84时可实现等频率间隔、边模抑制比（SMSR）为15 dB的五阶等幅光频梳（OFC）输出的结论。并提出一种基于虚拟仪器及微扰谐波响应的闭环反馈工作点控制方案，可自动锁定EOM的工作点于传输曲线上任意点。应用该控制方案实现了稳定的五阶等幅光频梳输出，1 h内输出功率的漂移小于其平均值的0.3%，光频梳平坦度小于0.4 dB，中心五阶光边带功率起伏的标准差小于0.15 dB/h。

关键词：光电子学等幅光频梳工作点控制电光调制器

一碳代谢关键酶——甲醇脱氢酶的研究进展与展望

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生物工程学报 2021年第2期37卷 530-540页

作者：凡立稳王钰郑平孙际宾中国科学技术大学生命科学学院安徽合肥230026 中国科学院系统微生物工程重点实验室天津300308 中国科学院天津工业生物技术研究所天津300308

甲醇和甲烷等一碳原料来源广泛,价格低廉,是生物制造的理想原料。甲醇脱氢酶(Methanol dehydrogenase,MDH)催化甲醇生成甲醛是一碳代谢的关键反应。目前已从天然甲基营养菌中发现了多种利用不同辅因子,具有不同酶学性质的MDH。其中,烟... 详细信息

甲醇和甲烷等一碳原料来源广泛,价格低廉,是生物制造的理想原料。甲醇脱氢酶(Methanol dehydrogenase,MDH)催化甲醇生成甲醛是一碳代谢的关键反应。目前已从天然甲基营养菌中发现了多种利用不同辅因子,具有不同酶学性质的MDH。其中,烟酰胺腺嘌呤双核苷酸(NAD)依赖型MDH被广泛应用于构建人工甲基营养菌。但是,NAD依赖型MDH的甲醇氧化活性较低,对甲醇的亲和力较差,导致甲醇氧化成为人工甲基营养菌代谢甲醇的限速步骤。为了提高甲醇氧化速率,进而提高人工甲基营养菌的甲醇利用效率,近年来大量研究集中于MDH的挖掘与改造研究。文中系统综述了不同类型MDH的发现、表征、改造以及在人工甲基营养菌中的应用进展,详细阐述了MDH的定向进化和多酶复合体的构建,并展望了通过细胞生长偶联的蛋白质进化和蛋白质理性设计获得高活性MDH的潜在策略。

关键词：甲醇脱氢酶甲醇定向进化人工甲基营养菌

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在高温水浸环境中环氧树脂的吸湿性研究

高分子材料科学与工程 1989年第5期5卷 62-67页

作者：蓝立文顾凡西北工业大学材料科学与工程系

本文研究了四缩水甘油醚基4,4’-二氟基二苯甲烷/4,4’-二氨基二苯砜为主的树脂在高温(100～150℃)水浸环境中的吸湿行为。测定了扩散系数、扩散活化能和平衡湿含量。用逐步回归法建立了树脂的湿含量与吸湿温度和时间的关系式,此式能较... 详细信息

本文研究了四缩水甘油醚基4,4’-二氟基二苯甲烷/4,4’-二氨基二苯砜为主的树脂在高温(100～150℃)水浸环境中的吸湿行为。测定了扩散系数、扩散活化能和平衡湿含量。用逐步回归法建立了树脂的湿含量与吸湿温度和时间的关系式,此式能较好地描述树脂的吸湿全过程。同时,还研究了树脂的吸湿机理。结果表明,在高温水作用下树脂内产生的膨胀应力引起损伤(空穴、裂缝的形成),从而增大了树脂的吸湿性。

关键词：环氧树脂吸湿性