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| 1 | Sediment pollution and its effect on fish through food chain in the Yangtze River显示文摘Suspended sediment adsorbs pollutants from flowing water in rivers and deposits onto the bed. However, the pollutants accumulated in the river bed sediment may affect the bio-community through food chain for a long period of time. To study the problem the concentration of heavy metals (Cr, Cd, Hg, Cu, Fe, Zn, Pb and As) in water, sediment, and fish/invertebrate were investigated in the middle and lower reaches of the Yangtze River during 2006-2007. The concentrations of heavy metals were 100-10,000 times higher in the sediment than in the water. Benthic invertebrates had relatively high concentrations of heavy metals in their tissues due to their proximity to contaminated sediments. Benthic invertivore fish had moderately high concentrations of heavy metals whereas phytoplanktivore fish, such as the silver carp, accumulated the lowest concentration of heavy metals. The concentrations of Cu, Zn, and Fe were higher than Hg, Pb, Cd, Cr, and As in the tissue samples. The concentration of heavy metals was lower in the river sediments than in the lake sediments. Conversely, the concentration of heavy metals was higher in river water than in lake water. While a pollution event into a water body is often transitory, the effects of the pollutants may be long-lived due to their tendency to be absorbed in the sediments and then released into the food chain. The heavy metals were concentrated in the following order: bottom material > demersal fish and benthic fauna > middle-lower layer fish > upper-middle layer fish > water. | Yujun YI Zhaoyin WANG Kang ZHANG Guoan YU Xuehua DUAN | 2008 | International Journal of Sediment Research2008，23，4： | 34 |
| 2 | Effect of streambed sediment on benthic ecology显示文摘Benthic macroinvertebrates have been commonly used as indicator species for assessment of aquatic ecology. Streambed sediment, or substrate, plays an important role in habitat conditions for macroinvertebrate communities. Field investigations were done to study the benthic diversity and macroinvertebrate compositions in various stream substrata. Sampling sites with different bed sediment, latitude, and climate were selected along the Yangtze River, the Yellow River, the East River, and the Juma River, in China. The results show that benthic community structures found in different substrata clearly differ, while those found in substrata of similar composition and flow conditions but in different macroclimates are similar. The study, thus, demonstrates that the benthic macroinvertebrate community is mainly affected by substrate composition and flow conditions, but is generally unaffected by latitudinal position and macroclimate. Taxa richness of the macroinvertebrate community was found to be the highest on hydrophyte-covered cobbles, high on moss-covered bedrock, and low on clay beds and cobble beds devoid of plant biomass. Sandy beds are compact and unstable, thus, no benthic macroinvertebrates were found colonizing such substrata. Aquatic insects account for most of the macroinvertebrates collected in these rivers. Different insects dominate in different types of substrata: mainly EPT species (Ephemeroptera, Plecoptera, Trichoptera) in cobble, gravel, and moss-covered bedrock; and Chironomidae larvae in clay beds. The relation between the number of species in the samples and the size of the sampling area fits a power function of the species area. One square meter (1m2) is suggested as the minimum sampling area. A substrate suitability index is proposed by integrating the suitability of sediment, periphyton, and benthic organic materials for macroinvertebrates. The biodiversity of macroinvertebrates increases linearly with the substrate suitability index. Benthic taxa richness increases linearly with the suitability index. | Xuehua DUAN Zhao-Yin WANG Mengzhen XU Kang ZHANG | 2009 | International Journal of Sediment Research2009，24，3： | 12 |
| 3 | Individual and combined toxic effects of cypermethrin and chlorpyrifos on earthworm显示文摘Toxicities were assessed for a pyrethroid (cypermethrin) and an organophosphate insecticide (chlorpyrifos) individually and in combination. A series of tests were conducted on different responses (acute, chronic, behavioral) of earthworms of species Eisenia fetida andrei in the ecological risk assessment of these pesticides. The results showed that the toxicity of the mixture of cypermethrin and chlorpyrifos was significantly higher than either of these pesticides individually, especially on the earthworm's chronic responses. At a concentration of 5 mg/kg, the mixture caused significant reductions on the growth and reproduction rates of earthworms, but did not cause any significant effect when the individual was tested. The increase in toxicity of the pesticide mixture means that the use of toxicity data obtained exclusively from single-pesticide experiments may underestimate the ecological risk of pesticides that actually present in the field. | Shiping Zhou Changqun Duan Wong Hang Gi Michelle Fazhong Yang Xuehua Wang | 2011 | Journal of Environmental Sciences2011，23，4： | 5 |
| 4 | Ecological and hydraulic studies of step-pool systems显示文摘 | Wang Zhaoyin Melching C S Duan Xuehua | 2009 | Journal of Hydraulic Engineering ASCE2009，135，9： | 1 |
| 5 | Ecological and hydraulic studies of step-pool systems 显示文摘 | Wang Zhaoyin Melching C S Duan Xuehua | 2009 | Journal of Hydraulic Engineering ASCE2009，135，9： | 1 |
| 6 | Ecological and hydraulic studies of step-pool systems 显示文摘 | WANG Zhaoyin MELCHING C S DUAN Xuehua | 2009 | Journal of Hydraulic Engineering2009，135，9： | 1 |
| 7 | An ultrapotent RBD-targeted biparatopic nanobody neutralizes broad SARS-CoY-2 variants显示文摘The wide transmission and host adaptation of SARS-CoV-2 have led to the rapid accumulation of mutations,posing significant challenges to the effectiveness of vaccines and therapeutic antibodies.Although several neutralizing antibodies were authorized for emergency clinical use,convalescent patients derived natural antibodies are vulnerable to SARS-CoV-2 Spike mutation. | Xiaojing Chi Xinhui Zhang Shengnan Pan Yanying Yu Yujin Shi Tianli Lin Huarui Duan Xiuying Liu Wenfang Chen Xuehua Yang Lan Chen Xiaoqian Dong Lili Ren Qiang Ding Jianwei Wang Wei Yang | 2022 | Signal Transduction and Targeted Therapy2022，7，3： | 1 |
| 8 | Ecological and hydraulic studies of step-pool systems 显示文摘 | WANG Zhaoyin MELCHING C S DUAN Xuehua | 2009 | Journal of Hy- draulic Engineering2009，135，9： | 1 |
| 9 | Ecological and hydraulic studies of step-pool systems 显示文摘 | Wang Zhaoyin Melching C S Duan Xuehua | 2009 | Journal of Hydraulic Engineering2009，135，9： | 1 |
| 10 | Investigation on Phase Transition of Ferroelectric Ceramics of Lead Titanate─Zirconate Doped with Niobium and Tin─Substituted Lead Titanate─Zirconate by DTA,DSC and PRD显示文摘InvestigationonPhaseTransitionofFerroelectricCeramicsofLeadTitanate─ZirconateDopedwithNiobiumandTin─SubstitutedLeadTitanate─Z... | Lu Changwei Xi Tonggeng Yang Xuehua Chen Yunxian Xu Yibin Dong Xianlin Duan Lian(Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050) | 1996 | 化学世界1996，37，S1： | 0 |
| 11 | Effect of streambed substrate on macroinvertebrate biodiversity显示文摘Macroinvertebrates areimportantcomponents of stream ecosystems,and are often used as indicator spe-cies for the assessment of river ecology.Numerous studies have shown that substrate is the primary physical envir-onmental variable affecting the taxa richness and density ofmacroinvertebrates.The aimofthiswork istostudythe effects of the characteristics of streambed substrate,such as grain size,shape,and roughness,on the composition and biodiversity of macroinvertebrates.A field experi-ment was done on the Juma River,a second-order moun-tain stream in northern China.Substrata of cobbles,hewn stones,pebbles,coarse sand,and fine sand were used to replace the original gravel and sand bed in a stretch of 30 m in length.The sampling results indicated that the macroinvertebrate assemblage is significantly affected by the grain size,porosity and interstitial dimension of the substrate,while it is rarely affected by the shape and the surface roughness of the experimental substrata.Macroinvertebrate compositions in cobbles and hewn stones were stable and changed least over time.The taxa richness and density of individuals in the substrata of cobbles,hewn stones,and pebbles are much higher than in those of the coarse sand and fine sand. | Xuehua DUAN Zhaoyin WANG Shimin TIAN | 2008 | Frontiers of Environmental Science & Engineering2008，2，1： | 0 |
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