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Photochemical degradation of chlorpyrifos in water

WU Xiangwei,NUA Rimao,TANG Feng,LI Xuede,CAO Haiqun,YUE Yongde,

应用生态学报 , 2006,
Abstract: In this paper, the effects of different light sources, temperature, pH, and water quality on the photochemical degradation of clilorpyrifos in water were examined under natural and simulated solar irradiation. The results showed that the photochemical degradation of chlorpyrifos in water followed the first order reaction, and its half-life was 0.62, 6.92, 19.74 and 22.50 h under high pressure mercury lamp (HPML), xenon lamp (XL), ultraviolet lamp (UV), and sunlight (SL) irradiation, respectively. Temperature had a significant effect on the degradation rate of chlorpyrifos, which was increased with increasing temperature and reached the maximum at 35 degrees C. The degradation rate of chlorpyrifos was stable both in acid and in neutral buffer solution, but enhanced in alkaline buffer solution. Water quality also had a significant effect, with a decreasing degradation rate of chlorpyrifos in the sequence of distilled water > tap water > river water > lake wate > paddy water.
Simple Random Sampling-Based Probe Station Selection for Fault Detection in Wireless Sensor Networks
Rimao Huang,Xuesong Qiu,Lanlan Rui
Sensors , 2011, DOI: 10.3390/s110303117
Abstract: Fault detection for wireless sensor networks (WSNs) has been studied intensively in recent years. Most existing works statically choose the manager nodes as probe stations and probe the network at a fixed frequency. This straightforward solution leads however to several deficiencies. Firstly, by only assigning the fault detection task to the manager node the whole network is out of balance, and this quickly overloads the already heavily burdened manager node, which in turn ultimately shortens the lifetime of the whole network. Secondly, probing with a fixed frequency often generates too much useless network traffic, which results in a waste of the limited network energy. Thirdly, the traditional algorithm for choosing a probing node is too complicated to be used in energy-critical wireless sensor networks. In this paper, we study the distribution characters of the fault nodes in wireless sensor networks, validate the Pareto principle that a small number of clusters contain most of the faults. We then present a Simple Random Sampling-based algorithm to dynamic choose sensor nodes as probe stations. A dynamic adjusting rule for probing frequency is also proposed to reduce the number of useless probing packets. The simulation experiments demonstrate that the algorithm and adjusting rule we present can effectively prolong the lifetime of a wireless sensor network without decreasing the fault detected rate.
A systematic analysis of the skeletal muscle miRNA transcriptome of chicken varieties with divergent skeletal muscle growth identifies novel miRNAs and differentially expressed miRNAs
Tingting Li, Rimao Wu, Yong Zhang, Dahai Zhu
BMC Genomics , 2011, DOI: 10.1186/1471-2164-12-186
Abstract: Some miRNAs have multiple isoforms and several miRNAs* are present at higher levels than their corresponding miRNAs. Thirty three novel and 189 known chicken miRNAs were identified using computational approaches. Subsequent miRNA transcriptome comparisons and real-time PCR validation experiments revealed 17 miRNAs that were differentially expressed between broilers and layers, and a number of targets of these miRNAs have been implicated in myogenesis regulation. Using integrative miRNA target-prediction and network-analysis approaches an interaction network of differentially expressed and muscle-related miRNAs and their putative targets was constructed, and miRNAs that could contribute to the divergent muscle growth of broiler and layer chickens by targeting the ACVR2B gene were identified, which can causes dramatic increases in muscle mass.The present study provides the first transcriptome profiling-based evaluation of miRNA function during skeletal muscle development in chicken. Systematic predictions aided the identification of potential miRNAs and their targets, which could contribute to divergent muscle growth in broiler and layer chickens. Furthermore, these predictions generated information that can be utilized in further research investigating the involvement of interaction networks, containing miRNAs and their targets, in the regulation of muscle development.Embryonic patterning and organogenesis involve coordinated differentiation, migration, proliferation and programmed cell death in metazoans. These complex cellular and developmental processes rely on precise spatiotemporal networks that regulate transcription factors at multiple levels including mRNA transcription and translation, protein stability and degradation. Recently, evidence has demonstrated that microRNAs (miRNAs or miRs) are involved in diverse aspects of biology including developmental regulation and the pathogenesis of human diseases [1-4]. miRNAs are small 19-24 nucleotide (nt) regulatory
Effects of dissolved compounds on photodegradation of mefenacet in water

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

应用生态学报 , 2006,
Abstract: The study with high-pressure mercury lamp illuminating showed that after illuminated for 15 min, NO2- and NO3- quenched the photolysis of mefenacet, and NO3- with a concentration ratio 10:1 (mass) had the most obvious effect, its quenching rate being up to 53.3%. Halogen ions inhibited the photolysis of mefenacet by "weight atom effect". When the concentration ratio of I- was 10:1, the quenching rate was 76.9% after illuminated for 15 min. Surfactants Nongru 500, Nongru 404, Nongru 601 and Nongru 603 had different effects on the photodegradation of mefenacet. At concentration ratios 1:5 and 1:1, only Nongru 404 showed a weak photosensitive effect, while in the other cases, all the four surfactants had photoquenching effects. Among the four herbicides benthiocarb, bensulfuron, alachlor and chlorsulfuron, only bensulfuron at low concentration ratio (1 : 10) accelerated the photolysis of mefenacet, with a photosensitive proportion of 18.2% after illuminated for 25 min. Aerified N2 could accelerate the photolysis of mefenacet, and the half-life was shortened from 7.14 min to 6.70 min without aerifying N2.
Studies on photodegradation of carbendazim in solvents and aqueous solutions

XU Baocai,YUE Yongde,HU Yinghui,HUA Rimao,

环境科学学报 , 2000,
Abstract: Under sunlight or high pressure mercury lamp(HPML),the phototransformation of carbendazim in solvents and aqueous solutions was studied.The main results were summarized as follows:Carbendazim decomposed very slowly in aqueous phase, n \|hexane and methanol under sunlight.The photolytic rate of MBC in acetone was high with half\|life of 33.80?h.Photosensitizer such as riboflavin,0 5% acetone and Fe 3 ,can enhance photolysis of MBC in aqueous solutions.Among them,riboflavin is the most senstivive one MBC can be degraded by 53 47% after 16 hours.Three pesticides,namely,triadimefon,butachlor,and carbofuran can affected significantly the photodecomposition of MBC in water under HPML.By 2 hours irradiation,the photoquench efficiency of triadimefon,butachlor and carbofuran on cabendazim are 244 05%,252 81%,and 262 92%,respectively.Under HPML,direct photolysis is the main process.The half\|life in redistilled water is 74 62?min.The photolytic rates of carbendazim in different water types or pH show following sequence:redistilled water>river water>pond water,or,pH4>pH9>pH7.
Studies on the photodegradation of Mefenacet in different water samples

CHU Mingjie,YUE Yongde,HUA Rimao,TANG Feng,

环境科学学报 , 2005,
Abstract: To study the effect of different waters on the photodegradation of Mefenacet, the photolysis of Mefenacet in pure water, natural water and buffer was studied. It indicated that in natural water samples, under the high-pressure mercury lamp(HPML) and xenon lamp(XL), the photo-half-lives of Mefenacet ranged samely as: paddy water > river water > lake water > river water(reservoir water) > redistilled water. The photo-half-lives under XL ranged from 607.80?min to (1016.40)?min, and under HPML ranged from 12.31?min to 18.53?min respectively. At room temperature, Mefenacet hydrolyzed easily in solution of pH=11.92. Under HPML, in buffers of pH=1.98 and 11.92, it photodegraded faster than in pure water, and the half-lives were 6.04?min(pH=1.98), 6.51?min(pH=11.92) and 6.75?min(redistilled water) respectively. Detecting the photoproducts by HPLC-MS indicated that a Metabolic pathway of mefenacet initiated by hydrolysis of amido groups and ether groups.
The damage of the optical components induced by the stimulated Brillouin scattering
Ge Zi-Ming,Lii Zhi-Wei,Cai Jun-Wei,Ao Shu-Yan,Luo You-nua,

中国物理 B , 2006,
Abstract: A theory of excitation of ultrasonic waves in the stimulated Brillouin scattering (SBS) process is presented in this paper. By using several reasonable approximations, a numerical calculation of the transient longitudinal SBS shows that large amplitude of acoustic waves can be built up by the nanosecond pulse of high-power laser, which may result in the damage of optical glasses. The maximal density change and the maximal acoustic wave intensity in optical glasses of 5\,cm in thickness are calculated by using different parameters of the high-energy laser, such as the intensity, the pulse width, and the wave length. The damage threshold of the optical glasses is about 80 GW/cm^{2} when using a 1064 nm laser. The dynamic mechanism of SBS is the electrostriction effect of the components coupling with the high-power laser.
Systematic identification and evolutionary features of rhesus monkey small nucleolar RNAs
Yong Zhang, Jun Liu, Chunshi Jia, Tingting Li, Rimao Wu, Jie Wang, Ying Chen, Xiaoting Zou, Runsheng Chen, Xiu-Jie Wang, Dahai Zhu
BMC Genomics , 2010, DOI: 10.1186/1471-2164-11-61
Abstract: In the present study, we performed the first systematic profiling of intermediate-size ncRNAs (50 to 500 nt) from the rhesus monkey by constructing a cDNA library. We identified 117 rhesus monkey ncRNAs, including 80 small nucleolar RNAs (snoRNAs), 29 other types of known RNAs (snRNAs, Y RNA, and others), and eight unclassified ncRNAs. Comparative genomic analysis and northern blot hybridizations demonstrated that some snoRNAs were lineage- or species-specific. Paralogous sequences were found for most rhesus monkey snoRNAs, the expression of which might be attributable to extensive duplication within the rhesus monkey genome. Further investigation of snoRNA flanking sequences showed that some rhesus monkey snoRNAs are retrogenes derived from L1-mediated integration. Finally, phylogenetic analysis demonstrated that birds and primates share some snoRNAs and host genes thereof, suggesting that both the relevant host genes and the snoRNAs contained therein may be inherited from a common ancestor. However, some rhesus monkey snoRNAs hosted by non-ribosome-related genes appeared after the evolutionary divergence between birds and mammals.We provide the first experimentally-derived catalog of rhesus monkey ncRNAs and uncover some interesting genomic and evolutionary features. These findings provide important information for future functional characterization of snoRNAs during primate evolution.It is widely accepted that up to 90% of the human genome is transcribed into various types of RNAs [1-4]. However, only a very small proportion of transcripts (~2-3%) encode proteins. Although there is a possibility that many transcripts are simply noise [5], a considerable number of non-protein-coding RNAs (npcRNAs/ncRNAs) are produced [1-4]. The increasing numbers of ncRNAs found by systematic genome-wide screening have also demonstrated the widespread existence of ncRNAs in nature [6-9]. The ncRNAs can be categorized by length as 19~35 nt small ncRNAs such as miRNAs and piRNAs [10
Photochemical degradation of chlorothalonil in aqueous solution

LI Xuede,HUA Rimao,YUE Yongde,LI Ying,TANG Feng,TANG Jun,

应用生态学报 , 2006,
Abstract: The study on the effects of light source, solution pH and temperature, and surfactant on the photochemical degradation of chlorothalonil showed that the half-life of chlorothalonil photodegradation under high pressure mercury lamp (HPML), UV lamp and sunlight was 22.4, 82.5 and 123.8 min, respectively. Under HPML and sunlight, chlorothalonil had a higher photolysis rate in alkaline solution than in neutral and acid solution. The photolysis rate increased with increasing solution temperature in the range of 10 degrees C - 40 degrees C, which was doubled when the temperature increased every 10 degrees C. Sodium laurylsulfonate (SDS), sodium dodecylbenzene sulfonate (SDBS), Tween 60 and Span 20 showed significant photosensitizing effects, while cetyltrimethylammonium bromide (CTAB) had significant photoquench effect on the photolysis of chlorothalonil.
Slope weighted scoring method for eutrophication comprehensive evaluation of lake

DENG Dapeng,LIU Gang,LI Xuede,TANG Feng,HUA Rimao,

环境科学学报 , 2006,
Abstract: There are different widths among 10 intervals of each assessment indicator through analysis on Control Standard for Eutrophication Surface Water, which indicate weight of each indicator should be changed with its monitored value. Based on above thoughts, a novel method, named Slope Weighted Scoring Method, is proposed for eutrophication comprehensive evaluation of lakes on the basis of Interpolation Scoring Method. All boundary data listed in assessment standard are normalized to eliminate influence of dimension. Slopes of 10 intervals of each indicator are calculated with normalized boundary data. First step of using this method is calculating corresponding trophic state score of each indicator with interpolation method according to its monitored value and assessment standard. The slope of each indicator is recorded simultaneously. Second step is allocating weight for each indicator with all recorded slopes. Finally, comprehensive trophic state score is obtained with weighted mean method according to scores and weights of all indicators. The proposed method makes the most of slopes of all indicators' intervals in assessment standard to allocate the weight of each indicator dynamically. The character of weights dynamic allocation answers to the nonlinear mapping essence of eutrophication comprehensive evaluation. Applying this method, Interpolation Method and Comprehensive Trophic Level Index Method to evaluate eutrophication of Chaohu Lake, the results showed that there was significant difference between this method and Interpolation Scoring Method, and the most significant difference between this method and Comprehensive Trophic Level Index Method.
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