检索结果-南通市图书馆

Chinese Journal of Oceanology and Limnology 2007年第2期25卷 215-220页

作者： ZHAO Xiaoxia Michael G FOX David C. LASENBY Alexis C. ARMIT Dolly N. KOTHAWALA Watershed Ecosystems Graduate Program Trent University Peterborough Ontario K9J 7B8 Canada Environmental ＆ Resource Studies Program and Department of Biology Trent University Peterborough ON K9J 7B8 Canada Department of Biology Trent University Peterborough ON K9J 7B8 Canada

The abundance and size composition of stream isopods Lirceusfontinalis were investigated from April 2001 to August 2002 in 3 streams in southem Ontario, Canada. Effects of current speed was released from the analysis by choosing slow flowing water. The effects of substrate, season and water depth on the abundance, distribution and size composition of the isopods were analyzed. It was found that substrate and season influence isopods the most. The rocky substrate with attached filamentous macro-algae contains an isopod abundance 7.05 times that of bare rock substrate and 14.6 times that of free-sand and mud substrate. There was a large variation with respect to seasonali .ty in both abundance and size composition of the isopods, with the highest abundance occumng in summer and the lowest in winter and spring; individual isopods also tend to be larger in the winter and spring. In all substrates, shallow areas tend to support higher densities of isopods than deeper areas.

关键词： isopods Lirceusfontinalis, size abundance substrate seasonal variation Ontario

Effect of substrate concentration on the bioleaching of heavy metals from sewage sludge

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2004年第5期16卷 788-792页

作者： CHENYing-xu HUAYu-mei ZHANGShao-hui DepartmentofEnvironmentalEngineering ZhejiangUniversityHangzhou310029China

The effect of elemental sulfur concentration on bioleaching of Cu, Zn and Pb and loss of fertilizer value from sewage sludge was investigated in flasks by batch experiments. The results showed that the ultimate pH of sludges with 3—5 g/L of sulfur added was about 1.3 and the production of SO 2- 4 had good correlation with the elemental sulfur concentration. The sensitivity of removal efficiency of metals to sulfur concentration was: Pb>Cu>Zn. The sulfur concentration except for 3—5 g/L had significant effect on the solubilization of Cu, Pb and Zn. The highest solubilization efficiency for sludge with 3 g/L of sulfur was 87.86% for Cu, 32.72% for Pb and 92.14% for Zn, which could make the treated sludge easily meet the metal limitations for land application. The sulfur concentration of 3 g/L was enough for the solubilization of all three heavy metals. The influence of sulfur concentration on solubilization of total nitrogen and potassium from sludge was negligible, but that on solublization of total phosphorus was of great importance. The loss of nitrogen, phosphorus and potassium of sludge with 3 g/L of sulfur by bioleaching was 38.2%, 52.1% and 42.8% respectively, and the sludge still remained satisfactory fertilizer value after bioleaching.

关键词： sewage sludge heavy metals bioleaching substrate fertilizer value

Grid and substrate bias effects on mechanical properties of diamond films prepared by HFCVD

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第S3期19卷 722-726页

作者：徐锋左敦稳卢文壮朱永伟王珉 College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing Research Institute of Electronics and Technology

Diamond films were prepared at different grid bias and substrate bias in hot filament chemical vapor deposition (HFCVD) system. The Raman and SEM results show that grain size decreases and non-diamond impurities increase for applying grid and substrate bias currents. The defects and impurities in the film increase with the decrease of grain size, which causes the decrease of hardness and elastic modulus of diamond films. The fracture toughness of film increases because of the grain size effects by applying bias. The grid bias and substrate bias make the friction coefficient smaller because of the smaller grain size and lubricating effect of graphite in the film. But the excessively high substrate bias current will lead to the dramatic decrease of mechanical properties of CVD diamond as a lot of non-diamond impurities appear in the film.

关键词： HFCVD diamond film grid bias substrate bias mechanical properties

Developing cold-resistant high-adhesive electronic substrate for WIMPs detectors at CDEX

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第4期29卷 72-76页

作者： Yuanyuan Liu Jianping Cheng Pan Pang Bin Liao Bin Wu Minju Ying Fengshou Zhang Lin Chen Shasha Lv Yandong Liu Tianxi Sun Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Beijing Radiation Center Beijing 100875China

Herein we report a prototypical electronic substrate specifically designed to serve the weakly interacting massive particles(WIMPs)detectors at the China Dark Matter Experiment(CDEX).Because the bulky high-purity germanium(HPGe)detectors operate under liquid-nitrogen temperatures and ultralow radiation backgrounds,the desired electronic substrates must maintain high adhesivity across different layers in such cold environment and be free from any radioactive *** conquer these challenges,for the first time,we employed polytetrafluoroethylene((C2F4)n)foil as the base substrate,in conjunction with ion implantation and deposition techniques using an independently developed device at Beijing Normal University for surface modification prior to *** remarkable peeling strengths of 0.88±0.06 N/mm for as-prepared sample and 0.75±0.05 N/mm for that after 2.5-days of soaking inside the liquid nitrogen were observed,while the regular standards commonly require 0.4 N/mm^0.6 N/mm for electronic substrates.

关键词： WIMPs detector CDEX surface modification electronic substrate

Effects of substrate on burrowing behavior,feeding physiology,and energy budget of undulated surf clam Paphia undulata

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第5期41卷 1795-1808页

作者： Pengfei ZHANG Edwine YONGO Fei LIU Shuai PAN Anfu SUN Long ZHOU Zhiqiang GUO Caihuan KE School of Environmental and Life Sciences Nanning Normal UniversityNanning 530001China State Key Laboratory of Marine Resource Utilization in South China Sea School of Life SciencesHainan UniversityHaikou 570228China State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources Xiamen 361102China Department of Fisheries&Aquatic Sciences University of EldoretEldoret 1125-30100Kenya

substrate is an important abiotic factor for burrowing shellfish,as it not only provides them with shelter,but also impose significant effect on their physiological ***,the physiological responses of burrowing clams within various substrates get less attention due to difficulty in carrying out physiological tests in buried ***,this study investigated the burrowing behavior,feeding physiology and energy budget of Paphia undulata,which is an important aquaculture bivalve species in south *** clams were exposed to mud and sand substrates with variable physical properties in the laboratory,to determine the suitable substrate conditions for this *** results showed that the percentage of burrowing clams,digging index,burrowing time,burrowing depth and scope for growth(SFG)were higher in mud substrates with≥40%water ***,burrowing percentage,digging index,and burrowing depths were higher in substrates with≤40%sand ***,the burrowing depth had significant effect on the feeding physiology and SFG of *** as clams burrowed at 6.3±1.8 cm had higher clearance rates and SFG as compared to other buried *** study further revealed that low water content in the sediment inhibited physiological performances of *** by impairing feeding or absorption,hence reducing the *** conclusion,mud substrate with≥40%water content or with≤40%sand content is suitable for proper burrowing and growth of *** findings therefore provide fundamental knowledge that will be applicable in the improvement of bottom aquaculture and conservation of ***.

关键词： Paphia undulata substrate feeding physiology scope for growth

Ultrasensitive Detection of Polycyclic Aromatic Hydrocarbons(PAHs) in Water Using Three-Dimensional SERS substrate Based on Porous Material and pH 13 Gold Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第6期18卷 1523-1531页

作者： SHI Xiaofeng YAN Xia ZHANG Xinmin MA Lizhen ZHANG Xu WANG Chunyan MA Jun Optics and Optoelectronics Laboratory Ocean University of ChinaQingdao 266100China Department of Physics and Electronic Science Weifang UniversityWeifang 261061China

Sensitivity is crucially important for surface-enhanced Raman spectroscopy(SERS)application to detect trace-level polycyclic aromatic hydrocarbons(PAHs)in the *** this study,a high sensitivity three-dimensional(3-D)SERS substrate composed with syringe filter,glycidyl methacrylate-ethylene dimethacrylate(GMA-EDMA)porous material and optimal parameters(57 nm,pH 13)gold nanoparticles(Au NPs)was developed for the detection of PAHs in *** enhancement effect and repeatability of this 3-D substrate were also *** Raman intensity of pyrene using 3-D SERS substrate is about 8 times higher than that of substrate only using p H 13 gold colloid solution and about 12 times higher than that of substrate using natural Au NPs and GMA-EDMA porous material,which means both the pH 13 AuN Ps and the GMA-EDMA porous material are important factors for the sensitivity of this 3-D SERS *** repeatability of this optimal 3-D substrate was *** relative standard deviation(RSD)is less than 8.66% on the same substrate and less than 3.69% on other different *** kinds of PAHs,i.e.,phenanthrene,pyrene,benzo(a)pyrene,benzo(k)fluoranthene and their mixture,were detected at the different *** limits of detection(LODs)are 8.3×10^-10(phenanthrene),2.1×10^-10(pyrene),3.8×10^-10(benzo(a)pyrene)and 1.7×10^-10 mol L^-1(benzo(k)fluoranthene),*** addition,these four PAHs were also detected by fluorescence spectroscopy to evaluate the sensitivity of SERS technology using this optimal 3-D SERS *** results showed that the sensitivity of SERS based on the 3-D SERS substrate even using the portable Raman system was closed to that of fluorescence ***,the SERS technology using this optimal 3-D substrate is expected to be an in-situ method for the detection of environmental PAHs.

关键词： surface-enhanced Raman scattering(SERS) polycyclic aromatic hydrocarbons(PAHs) three-dimensional SERS substrate fluorescence spectroscopy

Microbiota of a seepage face at the mouth of a subterranean estuary:diversity,distribution and substrate dependence

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第8期42卷 147-157页

作者： Yueming Wu Yongjun Wei Juan Severino Pino Ibánhez Danqing Sun Kaiqi Lu Qianqian Wang Jian Li Shan Jiang State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China School of Pharmaceutical Sciences Zhengzhou UniversityZhengzhou 450001China Instituto de Investigacións Mariñas Consejo Superior de Investigaciones CientíficasVigo 36208Spain School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

Subterranean estuaries,i.e.,the mixing zone between terrestrial groundwater and recirculated seawater,host a wide range of ***,field campaigns were conducted at the mouth of the subterranean estuary at the Sanggou Bay(Shandong Province,China)over four consecutive seasons at a seepage face(0−20 cm depth).The diversity of benthic microbiome was characterized via 16S rRNA gene sequencing and metagenomics,combined with physic-chemical parameters,e.g.,organic carbon,total nitrogen and sulfate contents in *** spring,the dominant species were assigned to the phylum *** opportunistic species was assigned to Acidobacteria,Actinobacteria and *** key components were identified to be species of the genera Pseudoalteromonas,Colwellia and Sphingobium,indicating the involvement of sediment microbiota in the degradation of sedimentary organic carbon,particularly that of pelagic origin,e.g.,phytoplankton detritus and bivalve *** spring,the microbial community was statistically similar along the depth profiles and among the three sampled *** spatial distributions were obtained in the remaining *** contrast,the dominant species assemblages varied significantly among seasons,with key genera being Thioprofundum and Nitrosopumilus during summer and autumn and Thioprofundum and Ilumatobacter during *** analysis revealed a seasonal shift in benthic nitrogen and sulfur metabolism associated with these variations in microbial community ***,our findings suggested that macro elements derived from pelagic inputs,particularly detrital phytoplankton,shaped the microbial community compositions at the seepage face,resulting in significant seasonal variations,while the influence of terrestrial materials transported by groundwater on the sediment microbiota at the seepage face found to be minor.

关键词： subterranean estuary microbiota seepage face seasonal variation substrate

Structural Insights into substrate Selectivity, Catalytic Mechanism,and Redox Regulation of Rice Photosystem Ⅱ Core Phosphatase

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2019年第1期12卷 86-98页

作者： Xiuying Liu Jingchao Chai Xiaomin Ou Mei Li Zhenfeng Liu National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of Sciences Beijing 100101P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

Photosystem Ⅱ (PSII)core phosphatase (PBCP)selectively dephosphorylates PSII core proteins including D1,D2,CP43,and *** function is required for efficient degradation of the D1 protein in the repair cycle of PSII,a supramolecular machinery highly susceptible to photodamage during oxygenic *** we present structural and functional studies of PBCP from Oryza sativa (OsPBCP).In a symmetrical homodimer of OsPBCP,each monomer contains a PP2C-type phosphatase core domain,a large motif characteristic of PBCPs,and two Small motifs around the active *** large motif contributes to the formation of a substrate-binding surface groove,and is crucial for the selectivity of PBCP toward PSII core proteins and against the light-harvesting ***,the phosphatase activity of OsPBCP is strongly inhibited by glutathione and H202.S-Glutathionylation of cysteine residues may introduce steric hindrance and allosteric effects to the active ***,these results provide detailed mechanistic insights into the substrate selectivity,redox regulation,and catalytic mechanism of PBCP.

关键词： PSII core phosphatase structure substrate selectivity redox regulation PSII repair cycle

Structural insights into substrate recognition by the type Ⅶ secretion system

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protein & Cell 2020年第2期11卷 124-137页

作者： Shuhui Wang Kaixuan Zhou Xiaolin Yang Bing Zhang Yao Zhao Yu Xiao Xiuna Yang Haitao Yang Luke WGuddat Jun Li Zihe Rao Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China CAS Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell BiologyChinese Academy of SciencesShanghai 200031China State Key Laboratory of Medicinal Chemical Biology College of Life Sciences and College of PharmacyNankai UniversityTianjin 300353China Laboratory of Structural Biology Tsinghua UniversityBeijing 100084China National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China School of Chemistry and Molecular Biosciences The University of QueenslandBrisbaneQLD 4072Australia University of Chinese Academy of Sciences Beijing 100101China

Type VII secretion systems(T7SSs)are found in many disease related bacteria including Mycobacterium tuberculosis(Mtb).ESX-1[early secreted antigen 6 kilodaltons(ESAT-6)system 1]is one of the five subtypes(ESX-1?5)of T7SSs in Mfb,where it delivers virulence factors into host macrophages during ***,little is known about the molecular details as to how this ***,we provide high-resolution crystal structures of the C-terminal ATPase3 domains of EccC subunits from four different Mtb T7SS *** structures adopt a classic RecA-like a/p fold with a conserved Mg-ATP binding *** structure of EccCbl in complex with the C-terminal peptide of EsxB identifies the location of substrate recognition site and shows how the specific signaling module XxxxMxF"for Mtb ESX-1 binds to this site resulting in a translation of the bulge loop.A comparison of all the ATPase3 structures shows there are significant differences in the shape and composition of the signal recognition pockets across the family,suggesting that distinct signaling sequences of substrates are required to be specifically recognized by different T7SSs.A hexameric model of the EccC-ATPase3 is proposed and shows the recognition pocket is located near the central substrate translocation *** diameter of the channel is?25-A,with a size that would allow helix-bundle shaped substrate proteins to bind and pass ***,our work provides new molecular insights into substrate recognition for Mtb T7SS subtypes and also a possible transportation mechanism for substrate and/or virulence factor secretion.

关键词： type VII secretion system Mycobacterium tuberculosis ATPase virulence factor substrate recognition

Optical and Micro-Structural Properties of ZnO Thin Films Grown on Silicon substrate by Pulsed Laser Deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第z1期24卷 26-28页

作者： He Jianting Zhuang Huizhao Xue Chengshan Tian Deheng Wu Yuxin Xue Shoubin Hu Lijun Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China

ZnO thin films were deposited on n-Si (111) at various substrate temperatures and oxygen pressures by pulsed laser deposition (PLD) using a Nd∶YAG laser with the wavelength of 1064 nm. X-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the microstructure, optical property and morphology of the ZnO thin films. A comparatively optimal crystallized ZnO thin film was obtained at the substrate temperature of 600 ℃ in oxygen pressure of 50 mTorr. The intensity of the luminescence strongly depends on the stoichiometry of the film as well as the crystalline quality.

关键词： PLD ZnO substrate temperature oxygen pressure