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Isolation and algae-lysing characteristics of the algicidal bacterium B5

Journal of Environmental Sciences 2007年第11期19卷 1336-1340页

作者： MU Rui-min fan zheng-qiu PEI Hai-yan YUAN Xue-liang Liu Si-xiu WANG Xiang-rong Department of Environmental Science and Engineering Fudan University Shanghai 200433 China College of Environmental Science and Engineering Ocean University of China Qingdao 266003 China Environmental Research Institute Shandong University Jinan 250100 China

Water blooms have become a worldwide environmental problem. Recently, algicidal bacteria have attracted wide attention as possible agents for inhibiting algal water blooms. In this study, one strain of algicidal bacterium B5 was isolated from activated sludge. On the basis of analysis of its physiological characteristics and 16S rDNA gene sequence, it was identified as Bacillusfusiformis. Its algaelysing characteristics on Microcystis aeruginosa, Chlorella and Scenedesmus were tested. The results showed that：（1） the algicidal bacterium B5 is a Gram-negative bacterium. The 16S rDNA nucleotide sequence homology of strain B5 with 2 strains of B. fusiformis reached 99.86%, so B5 was identified as B. fusiformis; （2） the algal-lysing effects of the algicidal bacterium B5 on M. aeruginosa, Chlorella and Scenedesrnus were pronounced. The initial bacterial and algal cell densities strongly influence the removal rates of chlorophyll-a. The greater the initial bacterial cell density, the faster the degradation of chlorophyll-a. The greater the initial algal cell density, the slower the degradation of chlorophyll-a. When the bacterial cell density was 3.6 × 10^7 cells/ml, nearly 90% of chlorophyll-a was removed. When the chlorophyll-a concentration was less than 550 μg/L, about 70% was removed; （3） the strain B5 lysed algae by secreting metabolites and these metabolites could bear heat treatment.

关键词： algicidal bacteria water blooms algae-lysing characteristic 16S rDNA Bacillusfusiformis

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Compressive fracture characteristics of Zr-based bulk metallic glass

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Science China(Physics,Mechanics & Astronomy) 2010年第5期53卷 823-827页

作者： fan ZhenJun,zheng ZhiYuan & JIAO ZengBao School of Materials Sciences and Technology,China University of Geosciences,Beijing 100083,China 1. School of Materials Sciences and Technology China University of Geosciences Beijing 100083 China

The compressive fracture characteristics of Zr-based bulk metallic glass under uniaxial compression tests are *** zigzag rheological behavior is observed in the compression stress-strain curves of amorphous *** room temperature the uniaxial compression fracture takes place along the plane which is at a 45-degree angle to the direction of the compressive *** microstructure of a typical fracture pattern is the vein network.A unique,finger-like vein pattern is found to exist at the fracture surface of Zr-based bulk metallic glass.

关键词： bulk metallic glass fracture surface compressive fracture

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Three-point bending fracture characteristics of bulk metallic glasses

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Science China(Physics,Mechanics & Astronomy) 2010年第4期53卷 654-657页

作者： fan ZhenJun, zheng ZhiYuan & JIAO ZengBao School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China 1. School of Materials Sciences and Technology China University of Geosciences Beijing 100083 China

This paper presents the SEM micrographs for the three-point bending fracture surfaces of Zr-based, Ce-based and Mg-based bulk metallic glasses (BMGs), which show the dimple structures in the three kinds of BMGs. The shapes of the giant plastic deformation domain on the fracture surface are similar but the sizes are different. The fracture toughness KC and the dimple structure size of the Zr-based BMG are both the largest, and those of the Mg-based BMG are the smallest. The fracture toughness KC and the dimple structure size of the Ce-based BMG are between those of the Zr-based and the Mg-based BMG. Through analyzing the data of different fracture toughnesses of the BMGs, we find that the plastic zone width follows w = (KC/σY)2/(6π).

关键词： metallic glass fracture surface tree-point bending

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Nuclear apoptosis induced by isolated mitochondria

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Cell Research 2000年第3期10卷 221-232页

作者： JIANG zheng fan, YUN ZHAO, XIA HONG, ZHONG HE ZHAI (College of Life Sciences, Peking University, Beijing, 100871 China) CollegeofLifeSciences PekingUniversityBeijingChina.

We isolated and purified mitochondria from mouse livers and spinach leaves. When added into egg extracts of Xenopus laevis, they caused nuclei of mouse liver to undergo apoptotic changes. Chromatin condensation, margination and DNA ladder were observed. After incubating isolated mitochondria in some hypotonic solutions, and centrifuging these mixtures at high speed, we got mitochondrial supernatants. It was found that in the absence of cytosolic factor, the supernatant alone was able to induce apoptotic changes in nuclei. The effective components were partly of protein. DNA fragmentation was partly inhibited by caspase inhibitors AC-DEVD-CHO and AC- YVADCHO. Meanwhile, caspase inhibitors fully blocked chromatin condensation. Primary characterization of the nuclear endonuclease(s) induced by mitochondrial supernatants was also conducted. It was found that this endonuclease is different from endonuclease G, cytochrome c-induced nuclease, or Ca2+-activated endonuclease.

关键词： Mitochondria supernatant apoptosis egg ex- tract nuclei DNA cleavage.

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Incidence of endophthalmitis after phacoemulsification cataract surgery:a Meta-analysis

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International Journal of Ophthalmology(English edition) 2022年第2期15卷 327-335页

作者： Si-Lu Shi Xiao-Ning Yu Yi-Lei Cui Si-fan zheng Xing-Chao Shentu Eye Center of the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009Zhejiang ProvinceChina GKT School of Medical Education King's College LondonLondon SEI 1ULEnglandUK

AIM:To evaluate the overall endophthalmitis incidence and the effectiveness of potential prophylaxis measures following phacoemulsification cataract surgery(PCS).METHODS:The Pub Med and Web of Science databases were searched from inception to April 30^(th),*** included studies that reported on the incidence of endophthalmitis following *** quality of the included studies was critically evaluated with the Newcastle-Ottawa quality assessment *** random effect or the fixed-effects model was used to evaluated the pooled incidence based on the *** publication bias was assessed by Egger’s linear regression and Begg’s rank correlation ***:A total of 39 studies containing 5 878 114 eyes were included and critically appraised in the *** overall incidence of endophthalmitis after PCS,the Meta-analysis yielded a pooled estimate of 0.092%(95%CI:0.083%-0.101%).The incidence appeared to decrease with time(before 2000:0.097%,95%CI:0.060%-0.135%;2000 to 2010:0.089%,95%CI:0.076%-0.101%;after 2010:0.063%,95%CI:0.050%-0.077%).Compared with typical povidone-iodine solution(0.178%,95%CI:0.071%-0.285%) and antibiotics subconjunctival injections(0.047%,95%CI:0.001%-0.095%),the use of intracameral antibiotics significantly reduced the incidence of endophthalmitis after PCS(0.045%,95%CI:0.034%-0.055%,RR:7.942,95%CI:4.510-13.985).CONCLUSION:Due to the advancement of phacoemulsification technology and the widespread use of intracameral antibiotics,the incidence of endophthalmitis following PCS shows a decreasing trend over *** use of intracameral antibiotics administration will significantly reduce the risk of endophthalmitis.

关键词： endophthalmitis phacoemulsification cataract surgery intracameral antibiotics antibiotics subconjunctival injections typical povidone-iodine solution Meta-analysis

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Realizing high thermoelectric performance for p-type SiGe in medium temperature region via TaC compositing

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Journal of Materiomics 2023年第5期9卷 984-991页

作者： zheng fan JiSheng Liang Jun-Liang Chen Ying Peng Huajun Lai Jian Nong Chengyan Liu Wangyang Ding Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuangxi Key Laboratory of Information MaterialGuilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin541004China Guangxi Academy of Sciences Nanning530007China

SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high *** study explores a novel strategy for coregulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma *** optimizing the amount of TaC in the SiGe matrix,the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with ***,the ensemble effect of the nanostructure leads to a significant decrease in thermal ***,a high ZT of 1.06 was accomplished at 873 K,which is 64%higher than that of typical radioisotope thermoelectric *** research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.

关键词： SiGe Thermoelectric Work function matching Modulation doping effect Phonon scattering

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Decoration of Electrospun Nanofibers with Magnetic Nanoparticles via Electrospinning and Sol-gel Process

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Chemical Research in Chinese Universities 2010年第5期26卷 847-850页

作者： YANG fan zheng Wei HUANG Hui-min LI Zhen-yu ZHANG Hong-nan WANG Wei WANG Ce Alan G. MacDiarmid Institute Jilin University Changchun 130012 P. R. China

Polyacrylonitrile（PAN）/Fe3O4 composite nanofibers were successfully obtained through electrospinning and sol-gel technology. The resulting magnetic Fe3O4 nanoparticles were homogeneously distributed on the surface of PAN nanofibers and the diameters of polyacrylonitrile nanofibers and nanoparticles were easily controlled, respectively. The distribution of Fe3O4 nanoparticles inside the nanofibrous composite was investigated by field emission scanning electron microscopy and transmission electron microscopy. X-ray diffraction reveals the presence of Fe3O4 nanoparticles in the composite nanofiber. The resulting sample shows a super paramagnetic behavior.

关键词： Electrospinning Magnetic Fe3O4 Nanoparticle Sol-gel

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The Laplacian Spread of Bicyclic Graphs

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Journal of Mathematical Research and Exposition 2010年第1期30卷 17-28页

作者： Yi zheng fan Shuang Dong LI Ying Ying TAN School of Mathematical Sciences Anhui University Anhui 230039 P. R. China Department of Mathematics & Physics Anhui University of Architecture Anhui 230022 P. R. China

The Laplacian spread of a graph is defined to be the difference between the largest eigenvalue and the second smallest eigenvalue of the Laplacian matrix of the graph. In our recent work, we have determined the graphs with maximal Laplacian spreads among all trees of fixed order and among all unicyclic graphs of fixed order, respectively. In this paper, we continue the work on Laplacian spread of graphs, and prove that there exist exactly two bicyclic graphs with maximal Laplacian spread among all bicyclic graphs of fixed order, which are obtained from a star by adding two incident edges and by adding two nonincident edges between the pendant vertices of the star, respectively.

关键词： bicyclic graph Laplacian matrix spread.

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Phase Effect on Mode Coupling in Kelvin—Helmholtz Instability for Two-Dimensional Incompressible Fluid

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Communications in Theoretical Physics 2009年第10期52卷 694-696页

作者： WANG Li-Feng TENG Ai-Ping YE Wen-Hua XUE Chuang fan zheng-Feng LI Ying-Jun China University of Mining and Technology （Beijing） Beijing 100083 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P.O. Box 8009-12 Beijing 100088 China Department of Physics Zhejiang University Hangzhou 310028 China Center for Applied Physics and Technology Peking University Beijing 100871 China

This paper studies the phase effect in mode coupling of Kelvin-Helmholtz instability in two-dimensionalincompressible *** is found that there is an important growth phenomenon of every mode in the mode *** growth changes periodically with phase difference and in the condition of our simulation the period is about0.7π.The period characteristic is apparent in all stage of the mode coupling process,especially in the relatively laterstage.

关键词： Kelvin-Helmholtz instability mode coupling phase effect

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Relations between sedimentary sequence and paleoclimatic changes during last 200 ka in the southern South China Sea

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Chinese Science Bulletin 2000年第14期45卷 1334-1340页

作者： Muhong Chen Xia Tu fan zheng Wen Yan Xianzan Tang Jun Lu Baogui Wang Miao’an Lu Chinese Acad Sci S China Sea Inst Oceanol Open Lab Marginal Sea Geol & Paleoenvironm Guangzhou 510301 Peoples R China

Core NS-93-5 was taken from the mild slope terrace of the southern South China Sea (SCS), which has preserved the steadiness depositional record of the normal marine environment since late Quaternary. Sedimentary sequence and oxygen isotopic stratigraphy of high resolution in the near 200 ka of the southern SCS has been established. By the comparative analysis with GISP2’s ice core, the depositional record of D/O’s events 1-21 and Heinrich’s events H1-H6 in the southern SCS that reflected the quick climate change in short time scale since the last interglacial stage is revealed, which indicates that in the last 200 ka in the southern SCS and the Arctic area there was tele-connection of paleoclimate and the unstability of the Western Pacific Warm Pool. This note shows that the sedimentary layers order of this sea area classified by color identification and by oxygen isotope stratum has the very good corresponding relation. The color feature of sediment changes along with the climate and the former

关键词： southern South China Sea sedimentary sequence quick climate change D/O and Heinrich events Toba’s volcanic record.

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