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Studies on rickettsia-like organism (RLO) disease of tropical marine pearl oyster-Epidemiological investigation of RLO disease in juvenile populations of maricultured Pinctada maxima

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Acta Oceanologica Sinica 2003年第3期22卷 421-435页

作者： Xinzhong Wu , Dengfeng Li, Jinpei Pan, Jingbo Jiang College of Animal Sciences,Zhejiang university,Hangzhou 31002.,china. Email: wuxz@zju.edu.cnSouth china Sea Institute of Oceanology, Chinese Academy of Sciences,guangzhou 510301,chinaSchool of Life Sciences,sun YAT-sen university,guangzhou 5102.5,china Zhejiang Univ Coll Anim Sci Hangzhou 310029 Peoples R China Chinese Acad Sci S China Sea Inst Oceanol Guangzhou 510301 Peoples R China sun Yat sen Univ Sch Life Sci Guangzhou 510275 Peoples R China

The death which occurred in juvenile population was a severe problem in the course ofPinctada maxima artificial culture. With the methods of field investigation, histological study and statistic analyses, the epidemiological study was carried out on the disease and death in juvenile populations of Pinctada maxima in the Xinying Pearl Oyster Mariculture Farm of Lingao County (for the A, B and C batches of cultured juveniles hanged in the sea) and the Xincun Pearl Oyster Mariculture Farm of Lingshui County (for the D batch of cultured juvenile hanged in the pond), Hainan Province from November 1993 to April *** results show that the deaths which occurred in juvenile populations of Pinctada maxima presented an outbreak pattern. The peak of mortality rates, in general, occurred in 4-to 6-month old pearl oyster juveniles, and the mortality rates gradully declined with the extention of pearl oyster age after cul-turing 8 months. The correlation between the mortality rates of juvenile populations and mean body lengths of juvenile populations show that the mortality rate become higher under 4 cm of mean body lengths of juvenile population and become obvious declined over 5 cm of mean body lengths. The peak of mortality rate occurred in 1-3 cm of mean body lengths. The results of histological observation showed that rickettsia-like organism inclusions were common, histological widespread infective agent among every batches (A, B, C and D) of cultured juvenile populations. The mean severity indices (SI) of rickettsia-like organism (RLO) infection were positively correlated with mortality rates of juvenile populations. After or within every peaks of RLO infection were all accompanied with the peaks of mortality rates of host populations and the mortality rates declined with decreased RLO infection. So the evidences of histological observation and epidemiology in this study indicated that rickettsia-like organism (RLO) may be as an important pathogenic organism of disease

关键词： Pinctada maxima rickettsia-like organism epidemiology juvenile population

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Supporting of Nickel(Ⅱ) Acenaphthenediimine with Free Amino Group for Ethylene Polymerization

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Journal of Wuhan university of Technology(Materials Science) 2010年第2期25卷 260-264页

作者：胡扬剑 Department of Chemistry and Chemical Engineering Huaihua College

Bis （4-（4-amino-3, 5-diethylbenzyl）-2. 6-diethylphenylimino） acenaphthene] di- chloronickel （NiLCl2. was prepared and supported on SiO2.modified by methyl trichlorsilane（S-1） and on SiO2.MgCl2.TiCl4 （S-2. respectively. Two supported catalysts S-1 and S-2.used as catalysts for ethylene polymerization were studied and the influences of various polymerization conditions, including the polymerization temperature, cocatalysts, Al/Ni molar ratio on the catalytic activity, branching degree and branch length of PE were also investigated. The experimental results show that the supported catalysts exhibit higher catalytic activity for ethylene polymerization, the highest catalytic activity of S-1 using AlEt2.l as cocatalyst at 50 ℃, reaching 5.8×10^5gPE/molNi·h, and needed lower Al/Ni molar ratio compared to homogeneous analogue.

关键词： nickel diimine complex supported catalyst branched polyethylene diethylaluminium chloride

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A new relative radiometric consistency processing method for change detection based on wavelet transform and a low-pass filter

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Science china(Technological Sciences) 2010年第S1期53卷 7-14页

作者： sun KaiMin1,SUI HaiGang1,2.LI DeRen1 & XU Chuan1,2.1 State Key Laboratory of Information Engineering in Surveying,Mapping and Remote sensing,Wuhan {2.,Wuhan 430079,china 2.State Key Laboratory of Subtropical Building Science,South china {2. of Technology,guangzhou 510640,china 1. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China 2. State Key Laboratory of Subtropical Building Science South China University of Technology Guangzhou 510640 China

The research purpose of this paper is to show the limitations of the existing radiometric normalization approaches and their disadvantages in change detection of artificial objects by comparing the existing approaches,on the basis of which a preprocessing approach to radiometric consistency,based on wavelet transform and a spatial low-pass filter,has been *** approach first separates the high frequency information and low frequency information by wavelet ***,the processing of relative radiometric consistency based on a low-pass filter is conducted on the low frequency *** processing,an inverse wavelet transform is conducted to obtain the results *** experimental results show that this approach can substantially reduce the influence on change detection of linear or nonlinear radiometric differences in multi-temporal images.

关键词： wavelet transform radiometric normalization low-pass filter change detection

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Research on the dynamics of the South china Sea opening:Evidence from analogue modeling

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Science china Earth Sciences 2006年第10期49卷 1053-1069页

作者： sun Zhen1,2. ZHOU Di1, ZHONG Zhihong3, XIA Bin2. QIU Xuelin1, ZENG Zuoxun4 & JIANG Jianqun5 1. CAS Key Laboratory of Marginal Sea Geology, South china Sea Institute of Oceanology, Chinese Academy of Sciences, {2. 510301, china 2. CAS Key Laboratory of Marginal Sea Geology, {2. Institute of Geochemistry, Chinese Academy of Sciences, {2. 510640, china 3. Department of Technology, Shenzhen Branch of CNOOC, {2. 5102.0, china 4. Faculty of Earth Sciences, china university of Geosciences, Wuhan 430074, china 5. Hainan Oil & Gas Exploration Company, Liaohe Oilfield Petrochina, Panjin 12.010, china 1. CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2. CAS Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 3. Department of Technology Shenzhen Branch of CNOOC Guangzhou 510240 China 4. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China 5. Hainan Oil & Gas Exploration Company Liaohe Oilfield PetroChina Panjin 124010 China

Independent of Indochina extrusion, the South china Sea experienced a process from passive continental rifting to marginal sea drifting. According to the fault patterns in the Beibu Gulf basin and the Pearl River Mouth basin, the continental rifting and early spreading stage from 32.to 2. Ma were controlled by extensional stress field, which shifted clockwise from southeastward to south southeastward. From 2. Ma on, the sea spread in NW-SE direction and ceased spreading at around 15.5 Ma. Integrated geological information with the assumption that the South china Sea developed along a pre-Cenozoic weakness zone, we did analogue experiments on the South china Sea evolu- tion. Experiments revealed that the pre-existing weakness zone goes roughly along the uplift zone between the present Zhu-1 and Zhu-2.depression. The pre-existing weakness zone is composed of three segments trending NNE, roughly EW and NEE, respectively. The early opening of the South china Sea is accompanied with roughly 15° clockwise rotation, while the SE sub-sea basin opened with SE extension. Tinjar fault was the western boundary of the Nansha block (Dangerous Ground), while Lupar fault was the eastern boundary of the Indochina, NW-trending rift belt known as Zengmu basin developed between above two faults due to block divergent of Indochina from Nansha. In the experiment, transtensional flower structures along NW-trending faults are seen, and slight inversion occurs along some NE-dipping faults. The existence of rigid massifs changed the orientations of some faults and rift belt, and also led to deformation concentrate around the massifs. The rifting and drifting of the South china Sea might be caused by slab pull from the proto South china Sea subducting toward Borneo and/or mantle flow caused by India-Asia collision.

关键词： South china Sea, rifting and drifting, clockwise rotation, analogue modeling, rigid massifs.

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New dragonflies (Insecta: Odonata: Gomphaeschnidae) from the Yixian Formation in Inner Mongolia, china

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Progress in Natural Science:Materials International 2008年第1期18卷 59-64页

作者： Binglan Zhang a ,Dong Rena ,*,Hong Pang b aCollege of Life Science,Capital Normal university,Beijing 100037,china bState Key Laboratory of Biocontrol and Institute of Entomology,{2. Yat-sen university,guangzhou 5102.5,china College of Life Science Capital Normal University Beijing 100037 China State Key Laboratory of Biocontrol and Institute of Entomology Sun Yat-sen University Guangzhou 510275 China

Two fossil dragonflies from the Upper Jurassic to Lower Cretaceous Yixian Formation in Liutiaogou Village,Ningcheng County, Inner Mongolia,china are described and *** are assigned to two new genera and species,i.e.,Sophoaeschna frigida gen. et *** Falsisophoaeschna generalis *** *** the family Gomphaeschnidae Tillyard&Fraser,*** is the first report of Odonata from Yixian Formation in Inner Mongolia and the second record of fossil Gomphaeschnidae from china.

关键词： Odonata New genus Upper Jurassic to Lower Cretaceous Yixian Formation china

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Perceptual video hashing robust against geometric distortions

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Science china(Information Sciences) 2012年第7期55卷 1520-1527页

作者： XIANG ShiJun 1,4 ,YANG JianQuan 2.& HUANG JiWu 3 1 School of Information Science and Technology,Jinan university,guangzhou 510632.{2. 2.Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,{2. 3 School of Information Science and Technology,sun Yat-sen university,guangzhou 5102.5,{2. 4 State Key Laboratory of Information Security,Institute of Software,Chinese Academy of Sciences,Beijing 100049,{2. 1. School of Information Science and Technology Jinan University Guangzhou 510632 China4. State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100049 China2. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China3. School of Information Science and Technology Sun Yat-sen University Guangzhou 510275 China

In this paper,we propose a robust perceptual hashing algorithm by using video luminance histogram in *** underlying robustness principles are based on three main aspects:1) Since the histogram is independent of position of a pixel,the algorithm is resistant to geometric deformations; 2. the hash is extracted from the spatial Gaussian-filtering low-frequency component for those common video processing operations such as noise corruption,low-pass filtering,lossy compression,etc.; 3) a temporal Gaussian-filtering operation is designed so that the hash is resistant to temporal desynchronization operations,such as frame rate change and *** a result,the hash function is robust to common geometric distortions and video processing *** results show that the proposed hashing strategy can provide satisfactory robustness and uniqueness.

关键词： video hashing geometric distortion histogram Gaussian filtering

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New insight into the role of miRNAs in leukemia

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Science china(Life Sciences) 2009年第3期52卷 224-231页

作者： ZHANG Hua & CHEN YueQin Key Laboratory of Genetic Engineering of the Ministry of Education,State Key Laboratory of Biocontrol,sun Yan-sen {2.,guangzhou 5102.5,china 1. Key Laboratory of Genetic Engineering of the Ministry of Education State Key Laboratory of Biocontrol Sun Yan-Sen University Guangzhou 510275 China

Recent studies have shown that microRNAs(miRNAs) play an important role in cell differentiation,growth,and death,including the functional study of miRNAs in *** date,miRNA expression profiles in many types of cancers have been identified and miRNA expression signatures associated with types and cytogenetics of leukemia have also been *** evidence has shown that miRNAs could function as either tumor suppressors or oncogenes in cancers such as leukemia,while other miRNAs might be benefitcial for diagnosis and prognosis,predicted to be newly developed *** this review,we summarize the recent progress about miRNAs in leukemia and present a miRNA-mediated network involved in differentiation,proliferation and apoptosis predicted to be the roles of miRNAs in the pathogenesis of leukemia.

关键词： miRNA leukemia regulation network clinical implication

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Computational RNomics:Structure identification and functional prediction of non-coding RNAs in silico

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Science china(Life Sciences) 2010年第5期53卷 548-562页

作者： ZHENG LingLing & QU LiangHu Key Laboratory of Gene Engineering of the Ministry of Education,State Key Laboratory for Biocontrol,sun Yat-sen {2.,guangzhou 5102.5,china 1. Key Laboratory of Gene Engineering of the Ministry of Education State Key Laboratory for Biocontrol Sun Yat-sen University Guangzhou 510275 China

The eukaryotic genome contains varying numbers of non-coding RNA(ncRNA) genes."Computational RNomics" takes a multidisciplinary approach,like information science,to resolve the structure and function of ***,we review the main issues in "Computational RNomics" of data storage and management,ncRNA gene identification and characterization,ncRNA target identification and functional prediction,and we summarize the main methods and current content of "computational RNomics".

关键词： non-coding RNA eukaryote computational RNomics

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Non-coding RNAs and the acquisition of genomic imprinting in mammals

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Science china(Life Sciences) 2009年第3期52卷 195-204页

作者： ZHANG YiJun & QU LiangHu Key Laboratory of Gene Engineering of the Ministry of Education,State Key Laboratory for Biocontrol,sun Yan-sen {2.,guangzhou 5102.5,china Key Laboratory of Gene Engineering of the Ministry of Education State Key Laboratory for Biocontrol Sun Yan-Sen University Guangzhou 510275 China

Genomic imprinting,representing parent-specific expression of alleles at a locus,is mainly evident in flowering plants and placental *** imprinted genes,including numerous non-coding RNAs,are located in clusters regulated by imprinting control regions(ICRs).The acquisition and evolution of genomic imprinting is among the most fundamental genetic *** about the transition of mammalian imprinted gene domains from their non-imprinted ancestors,especially recent studies undertaken on the most ancient mammalian clades-the marsupials and monotremes from which model species genomes have recently been sequenced,are of high *** reviewing and analyzing these studies,a close connection between non-coding RNAs and the acquisition of genomic imprinting in mammals is *** evidence comes from two observations accompanied with the acquisition of the imprinting:(i) many novel non-coding RNA genes emerged in imprinted regions;(ii) the expressions of some conserved non-coding RNAs have changed ***,a systematical analysis of imprinted snoRNA(small nucleolar RNA) genes from 15 vertebrates suggests that the origination of imprinted snoRNAs occurred after the divergence between eutherians and marsupials,followed by a rapid expansion leading to the fixation of major gene families in the eutherian ancestor prior to the radiation of modern placental *** in the regulation of imprinted silencing and mediating the chromatins epigenetic modification may be the major roles that non-coding RNAs play during the acquisition of genomic imprinting in mammals.

关键词： genomic imprinting mammals non-coding RNAs

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Robust AVS audio watermarking

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Science china(Information Sciences) 2010年第3期53卷 607-618页

作者： WANG Yong & HUANG JiWu Guangdong Key Laboratory of Information Security Technology, School of Information Science and Technology, sun Yat-sen {2., guangzhou 5102.5, china 1. Guangdong Key Laboratory of Information Security Technology School of Information Science and Technology Sun Yat-Sen University Guangzhou 510275 China

Part Ⅲ of AVS (china Audio and Video Coding Standard) is the first generic audio standard proposed in china and is becoming popular in some applications. For MP3 audio, some effiorts have been made to solve the copyright pirating and malicious modifications by the way of watermarking. To our best knowledge, similar work on the AVS audio has not been explored. In this paper, we pre{2.t a novel robust watermarking algorithm for AVS audio. We find that the frame type in the AVS coded process can be used as a robust feature for watermarking. Then we design a novel watermarking algorithm which is integrated into the AVS audio coding process. The watermark bits are embedded into the compressed bit stream. At the extracting end, the watermark bits can be extracted from the compressed bit stream directly. This algorithm achieves robustness to decoding/re-coding attacks, and has low computation complexity for both embedding and extracting while preserving the quality of the audio signals.

关键词： AVS audio security problems robust watermarking

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