检索结果-南通市图书馆

mLife 2024年第1期3卷 143-155页

作者： Jing Zhang Qi-Yun Liang Da-Shuai Mu Fengbai Lian Ya Gong Mengqi Ye guan-jun chen Yuqi Ye Zong-jun Du State Key Laboratory of Microbial Techlogy Insttute of Micrbial TchnoogyShandong UniversityQingdaoChina Marine College Shandong UniverstyWeihaiChina Shandong University-Weihai Research Institute of Industrial Technology WeihaiChina

In the classical microbial isolation technique,the isolation process inevitably destroys all microbial interactions and thus makes it difficult to culture the many microorganisms that rely on these interactions for *** this study,we designed a simple coculture technique named the“sandwich agar plate method,”which maintains microbial interactions throughout the isolation and pure culture *** total yield of uncultured species in sandwich agar plates based on eight helper strains was almost 10-fold that of the control *** uncultured species displayed commensal *** study found that heme was the growth-promoting factor of some marine commensal *** genomic analysis revealed that heme auxotrophies were common in various biotopes and prevalent in many uncultured microbial ***,our study supported that the survival strategies of heme auxotrophy in different habitats varied *** findings highlight that cocultivation based on the“sandwich agar plate method”could be developed and used to isolate more uncultured bacteria.

关键词： cultivation growth factors heme sandwich agar plate uncultured bacteria

Durable dual-state duplex Si-HfO_(2)with excellent oxidation and cracking resistance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第3期13卷 388-401页

作者： Lin chen Jing-Chuan Luo Wen-Qi Yang Chang-Jiu Li guan-jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Engine Company Limited in CASC Xi’an 710065China

The lifetime of Si bond coatings in environmental barrier coatings is constrained by phase-transition-induced cracking of the SiO_(2)*** this study,Si-HfO_(2)dual-state duplex composite materials are proposed to address this issue by partially forming HfSiO_(4)and minimizing the SiO_(2)*** as-prepared composite exhibited a structure comprising discrete HfO_(2)“bricks”embedded in a continuous Si“mortar”,while the oxidized state transformed into discrete HfSiO_(4)“bricks”within continuous thin SiO_(2)“mortars”.The results indicate that continuous thin SiO_(2)contributes to reducing the oxidation rate to a level comparable to that of pure Si,and discrete HfSiO_(4)particles aid in relieving phase transition-induced stress and inhibiting crack propagation,thereby enhancing oxidation and cracking resistance ***,the composite with 20 mol%HfO_(2)and a mean particle size of~500 nm at 1370℃exhibited a service lifetime 10 times greater than that of pure *** research provides valuable insights for designing Si-based bond coatings with improved service lifetime.

关键词： oxidation environmental barrier coatings(EBCs) phase transition cracking bond coatings

Short‑chain fatty acids(SCFAs)as potential resuscitation factors that promote the isolation and culture of uncultured bacteria in marine sediments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2023年第3期5卷 400-414页

作者： Chun-Shui Sun Liu-Yan Zhou Qi-Yun Liang Xiao-Man Wang Yi-Xuan Lei Zhen-Xing Xu Feng-Qing Wang guan-jun chen Zong-jun Du Da-Shuai Mu Marine College Shandong UniversityWeihai 264209China State Key Laboratory of Microbial Technology Institute of Microbial TechnologyShandong UniversityQingdao 266237China Weihai Research Institute of Industrial Technology of Shandong University Weihai 264209China Institute of Microbiology Applications Xinjiang Academy of Agricultural SciencesUrumqi 830000China Tancheng County Inspection and Testing Center Tancheng 276100China Department of Applied Biological Chemistry Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo-KuTokyo 113-8657Japan Max Planck Institute for Marine Microbiology Celsiusstraße 128359 BremenGermany

Many marine bacteria are difcult to culture because they are dormant,rare or found in *** culturing has been widely tested as an important strategy to isolate rare or dormant ***,many more mechanisms remain ***,based on 16S rRNA gene high-throughput sequencing and metabolomics technology,it was found that the short-chain fatty acids(SCFAs)in metabolites were signifcantly correlated with uncultured bacterial groups during enrichment cultures.A pure culture analysis showed that the addition of SCFAs to media also resulted in high efciency for the isolation of uncultured strains from marine *** a result,238 strains belonging to 10 phyla,26 families and 82 species were successfully *** uncultured rare taxa within Chlorobi and Kiritimatiellaeota were successfully *** the newly isolated uncultured microbes,most genomes,***,possess SCFA oxidative degradation genes,and these features might aid these microbes in better adapting to the culture media.A further resuscitation analysis of a viable but non-culturable(VBNC)Marinilabiliales strain verifed that the addition of SCFAs could break the dormancy of Marinilabiliales in 5 days,and the growth curve test showed that the SCFAs could shorten the lag phase and increase the growth ***,this study provides new insights into SCFAs,which were frst studied as resuscitation factors in uncultured marine ***,this study can help improve the utilisation and excavation of marine microbial resources,especially for the most-wanted or key players.

关键词： Marine bacteria SCFAs VBNC Resuscitation culture

Efficient removal of Cr(VI) by polydopamine-modified lignin from aqueous solution: Batch and XAFS studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Water Science and Engineering 2024年第1期17卷 51-61页

作者： Xiao-jie Guo Wei-kang Fu Jing-yuan Ma Bo-jun Xi chen Wang Meng-yao guan College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China College of Textile and Garment Shaoxing UniversityShaoxing 312000China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Lignocellulose has the potential to become a bio-based adsorbent due to its biodegradability and *** this study,a novel polydopamine functionalized-lignin(lignin@PDA),prepared via self-polymerization of dopamine(PDA)on lignin,was used as a bio-based adsorbent for rapid scavenging of hexavalent chromium(Cr(VI)).The morphology,functional groups,crystalline structure,and chemical composition of lignin@PDA were characterized with a scanning electron microscope-energy dispersive spectrometer,Fourier transform infrared spectroscopy,X-ray diffraction,and X-ray photoelectron *** Cr(VI)adsorption process of lignin@PDA was studied using batch experiments as a function of pH,ionic strength,adsorbent dose,and contact time at room *** adsorption rate of lignin@PDA was five times greater than that of the unmodified lignin,with a maximum adsorption capacity of 102.6 mg/g in an acidic *** adsorption of Cr(VI)on lignin@PDA fit the pseudo-secondorder equation and the Freundlich model,indicating that the adsorption process was mainly dominated by chemisorption and surface *** thermodynamic parameters showed that adsorption of Cr(VI)on lignin@PDA was an endothermic and spontaneous *** X-ray absorption fine structure results showed that sorption and reduction of Cr(VI)into Cr(II)occurred simultaneously on ***,PDA coating not only improved the reactivity of lignin but also promoted the complete reduction of Cr(VI)by *** to these results,polydopamine functionalized-lignin is a promising bio-based adsorbent for immobilization of Cr(VI)from wastewater.

关键词： Lignin Polydopamine Hexavalent chromium EXAFS Adsorption mechanism

Dynamic Couplingand Cooperative Control for Multi-paralleled Doubly Fed Induction Generator Wind Farms during Symmetrical Low Voltage Ride-through in a Weak Grid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2024年第3期9卷 112-125页

作者： Lei guan jun Yao the College of Electrical Engineering at Chongqing University ChongqingChina the State Key Laboratory of Power Transmission Equipment Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China

In multi-fed grid-connected systems,there are complex dynamic interactions between different pieces of *** in situations of weak-grid faults,the dynamic coupling between equipment becomes more *** may cause the system to experience small-signal instability during the fault *** this paper,multi-paralleled doubly fed induction generator(DFIG)-based wind farms(WFs)are taken as an example to study the dynamic coupling within a multi-fed system during fault steady-state of symmetrical low voltage ride-through(LVRT)in a weak *** analysis reveals that the dynamic coupling between WFs will introduce a damping shift to each *** inevitably affects the system’s dynamic stability and brings the risk of small-signal instability during fault steady-state in LVRT *** the distance to fault location and fault severity will exacerbate the dynamic coupling between *** of the dynamic coupling,adjusting the control state of one WF will affect the stability of the remaining WFs in the ***,a cooperative control strategy for multi-paralleled DFIG WFs is proposed to improve dynamic stability during *** analysis and the effectiveness of the proposed control strategy are verified by modal analysis and simu-lation.

关键词： Doubly fed induction generator(DFIG) wind farms(WFs) dynamic stability low voltage ride through(LVRT) weak grid dynamic coupling

Photothermal catalysts for efficient and clean fuel production at atmospheric pressure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1762-1764页

作者： Xinwei guan Yang chen Tianyi Ma School of Science RMIT UniversityMelbourneVIC3000Australia Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning UniversityShenyang110036China

The use of waste carbon resources to produce valuable chemicals and hydrocarbon fuels has attracted great interest in recent *** a transformation not only maximises the utilisation of carbon resources but also plays a... 详细信息

关键词： thermal transformation clean

同方期刊数据库

Light-induced stepped thermal relaxation in a Hofmann-type metal-organic framework

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1983-1989页

作者： Wen Cui Wei-Wei Wu Ze-Yu Ruan Yan-Cong chen guang-jun Zeng guan-Xi chen Si-Guo Wu Zhao-Ping Ni Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistryInstitute of Green Chemistry and Molecular EngineeringGuangdong Basic Research Center of Excellence for Functional Molecular EngineeringSun Yat-sen UniversityGuangzhou510275China

Spin-crossover(SCO)materials with light-induced multistability have potential applications in multi-addressable opto-magnetic memory devices and multiple ***,we reported a three-dimensional Hofmann-type metal-organic framework(MOF)[Fe(bpy){Pt(CN)_(4)}]·coumarin(1·coumarin,bpy=4,4′-bipyridine),which exhibits an incomplete and hysteretic SCO *** importantly,the light-induced stepped thermal relaxation(LISTR)with obvious magnetic plateau for a hidden intermediate spin state is firstly *** hidden spin state is also observed for the first time in the thermal relaxation after light-assisted spin state annealing(LASSA).Meanwhile,an extremely rare bi-directional light-induced excited spin-state trapping(LIESST)with the highest reverse-LIESST temperature is ***,five spin states can be captured in 1·coumarin and the tristability can be modulated below 102 K through the excitation-relaxation ***,the light-and temperatureinduced multistability provides a new strategy for developing multistable materials.

关键词： light magnetic multistability iron metal-organic framework spin-crossover

同方期刊数据库

Strategies for culturing active/dormant marine microbes

在线全文

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2021年第2期3卷 121-131页

作者： Da-Shuai Mu Yang Ouyang guan-jun chen Zong-jun Du State Key Laboratory of Microbial Technology Institute of Microbial TechnologyShandong UniversityQingdao266237China Marine College Shandong UniversityWeihai264209China Institute for Environmental Genomics University of OklahomaNormanOKUSA

Microorganisms are ubiquitous in the ocean environment and they play key roles in marine ecosystem function and ***,many of their functions and phenotypes remain unknown because indigenous marine bacteria are mostly difficult to *** many novel techniques have brought previously uncultured microbes into laboratory culture,there are still many most-wanted or key players that need to be cultured from marine *** review discusses possible reasons for‘unculturable microbes’and categorizes uncultured bacteria into three groups:dominant active bacteria,rare active bacteria,and dormant *** review also summarizes advances in cultivation techniques for culturing each group of unculturable *** the natural environment is an effective strategy for isolating dominant active bacteria,whereas culturomics and enrichment culture methods are proposed for isolating rare active *** dormant bacteria,resuscitation culture is an appropriate ***,the review provides a list of the most-wanted bacteria and proposes potential strategies for culturing these bacteria in marine *** review provides new insight into the development of strategies for the cultivation of specific groups of uncultured bacteria and therefore paves the way for the detection of novel microbes and their functions in marine ecosystems.

关键词： Uncultured marine bacteria Culture strategies Dominant active bacteria Rare active bacteria Dormant bacteria Most-wanted bacteria

A Review of Contact Electrification at Diversified Interfaces and Related Applications on Triboelectric Nanogenerator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第1期16卷 106-130页

作者： jun Hu Mitsumasa Iwamoto Xiangyu chen CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Department of Physical Electronics Tokyo Institute of Technology2‑12‑1 S3‑33 O‑OkayamaMeguro‑KuTokyo 152‑8552Japan

The triboelectric nanogenerator(TENG)can effectively collect energy based on contact electrification(CE)at diverse interfaces,including solid–solid,liquid–solid,liquid–liquid,gas–solid,and gas–*** enables energy harvesting from sources such as water,wind,and *** this review,we provide an overview of the coexistence of electron and ion transfer in the CE *** elucidate the diverse dominant mechanisms observed at different interfaces and emphasize the interconnectedness and complementary nature of interface *** review also offers a comprehensive summary of the factors influencing charge transfer and the advancements in interfacial modification ***,we highlight the wide range of applications stemming from the distinctive characteristics of charge transfer at various ***,this review elucidates the future opportunities and challenges that interface CE may *** anticipate that this review can offer valuable insights for future research on interface CE and facilitate the continued development and industrialization of TENG.

关键词： Contact electrification Interfaces Triboelectric nanogenerators Diversified applications

Exploring a balance between strength and ductility of hexagonal BN nanoplatelet reinforced ZK61 magnesium composite

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第5期12卷 1899-1910页

作者： Kewei Zhang Xiaolong Lu Yufeng Sun Shaokang guan Yao chen School of Materials Science and Engineering Zhengzhou University Key Laboratory of Advanced Magnesium Alloys in Henan Province Zhengzhou University Key Laboratory of Advanced Materials Processing&Mold Ministry of Education School of Mechanical and Electrical Engineering Soochow University

The practical applications of magnesium（Mg） alloys are usually beset by their relatively low strength and limited ductility. Herein we attempt to fabricate hexagonal BN nanoplatelet（BNNP） reinforced ZK61 magnesium composites using a combination of spark plasma sintering and friction stir processing. The resulting composites exhibit microstructural characteristics of homogeneous dispersion of BNNP in Mg matrix with refined equiaxed grains and（0002） basal texture roughly surrounding the pin column surface. Transmission electron microscopy observation illustrates that trace amounts of Mg3N2and MgB2form at BNNP-Mg interface, in which Mg3N2locates at the basal plane of a BNNP and MgB2grows at its open edge. The spatial distribution of Mg3N2and MgB2facilitates interfacial wetting and stronger BNNP-Mg interface in such a way that interfacial products act as anchors bonding between them. In comparison with monolithic ZK61 alloy,the BNNP/ZK61 composites display simultaneous improvements in yield strength, hardness and ductility, achieving good strength-ductility balance. This research is expected to shed some light on BNNP potentials for designing and producing magnesium composites with high strength and good ductility.

关键词： BN nanoplatelet Magnesium composite Strength Ductility Spark plasma sintering Friction stir processing