Polybrominated diphenyl ethers (PBDEs) in sediments and mussel tissues from Hong Kong marine waters   总被引：17，自引：0，他引：17  

Liu Y  Zheng GJ  Yu H  Martin M  Richardson BJ  Lam MH  Lam PK 《Marine pollution bulletin》2005,50(11):1173-1184

Sediments and green-lipped mussels, Perna viridis, were used to investigate concentrations of polybrominated diphenyl ethers (PBDEs) in Hong Kong's marine environment. PBDEs have been used extensively over the past two decades as flame retardants in polymer additives for a variety of plastics, computers, furniture, building materials, and fabrics. Many measurements of PBDEs in various environmental matrices have been reported from Belgium, Holland, Japan, Europe and North America, but few measurements are available for the southeast Asian region and Hong Kong. PBDE congeners (n=15) were measured in 13 sediments and nine mussel samples, taken from Hong Kong marine waters. The Sigma15PBDEs in sediments ranged between 1.7 and 53.6 ng g(-1) dry wt, with the highest concentrations located around the most heavily populated areas of Victoria Harbour and Sai Kung, while the lowest concentrations of Sigma15PBDEs were found at more remote locations of Sha Tau Kok, Wong Chuk Bay, Castle Peak Bay, and Gold Coast. Sigma15PBDEs ranged from 27.0 to 83.7 ng g(-1) dry wt of mussel tissues. Although not identical, most of the congeners in sediments were found in mussel tissues, with BDE-47, BDE-99, BDE-153 and BDE-183 being the most prominent in both matrices. On the basis of a literature survey, the concentrations of PBDEs reported in Hong Kong sediments and mussel tissues are amongst the highest in the world.  相似文献   

Emerging chemicals of concern: pharmaceuticals and personal care products (PPCPs) in Asia, with particular reference to Southern China   总被引：40，自引：0，他引：40  

Richardson BJ  Lam PK  Martin M 《Marine pollution bulletin》2005,50(9):913-920

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Optimal allocation of water resources: Edited by M. J. Lowing IAHS Publications No. 135, Washington,DC, 416 pp     

David C.L. Lam 《Advances in water resources》1983,6(4):250-251

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Numerical prediction experiment on Typhoon Maggie (9903)   总被引：3，自引：1，他引：3  

Fong Soi Kun  Wu Chisheng  Hao I Pan  Lam Kin Hang  Ku Chi Meng  Wang Anyu  Lin Wenshi 《海洋学报(英文版)》2001,20(2):171-181

I~IOXTyphoon is a severe and diSaStrous weather phenomenon that affeCts the southeaSt COaStsregion of China. It causes Serious lOSS for the social eCOnondc development as well as the life andproperties Of PeOPle. Therefore, the enhancement to study on the artifice of monitoring, Prediction and public services of typhoon is an i~nent requirement for gove~t and Public.The concern is also a taSk of great Urgency to advanCe meteorolQgical sciences.Starting from the 1980' s, as the deve…  相似文献   

Application du modele de distribution d'abondance de Mandelbrot a l'estimation des captures dans l'etang de Thau     

Bach  Pascal; Amanieu  Michel; Hoai  Thong Lam; Lasserre  Gerard 《ICES Journal of Marine Science》1988,44(3):235-246

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Regulation of Tilapia metallothionein gene expression by heavy metal ions     

Andrew P. L. Cheung  Timothy H. -J. Lam  King Ming Chan   《Marine environmental research》2004,58(2-5):389

Tilapia is a common fish species inhabiting inland waters and estuarine regions in Hong Kong and Southeast Asia, and useful for bio-monitoring of metal pollution. Metallothionein (MT) gene expression in fish tissues has been useful to sub-lethal risk assessment as biomarker of exposure to metal ions in fishes inhabiting metal contaminated area. To investigate metal inductions of Tilapia MT gene expression in vivo, Tilapias were injected with different concentrations of heavy metals and tissues were then removed for quantitative PCR assay using mimic PCR methods. All of the metal ions tested (Cu²⁺, Cd²⁺, Hg²⁺, Ni²⁺, Pb²⁺ and Zn²⁺) were able to induce hepatic MT mRNA levels. Renal MT mRNA levels of Cd²⁺ and Zn²⁺ treated fish was not induced with significant fold induction, however MT mRNA levels in gills were sensitive to the administrations of these metal ions. These data indicated that Tilapia MT mRNA levels in gills and liver are sensitive biomarker of exposure to various metal ions.  相似文献   

Spatiotemporal data model for network time geographic analysis in the era of big data   总被引：1，自引：0，他引：1  

Bi Yu Chen  Hui Yuan  Shih-Lung Shaw  William H.K. Lam  Xiaoling Chen 《International journal of geographical information science》2016,30(6):1041-1071

There has been a resurgence of interest in time geography studies due to emerging spatiotemporal big data in urban environments. However, the rapid increase in the volume, diversity, and intensity of spatiotemporal data poses a significant challenge with respect to the representation and computation of time geographic entities and relations in road networks. To address this challenge, a spatiotemporal data model is proposed in this article. The proposed spatiotemporal data model is based on a compressed linear reference (CLR) technique to transform network time geographic entities in three-dimensional (3D) (x, y, t) space to two-dimensional (2D) CLR space. Using the proposed spatiotemporal data model, network time geographic entities can be stored and managed in classical spatial databases. Efficient spatial operations and index structures can be directly utilized to implement spatiotemporal operations and queries for network time geographic entities in CLR space. To validate the proposed spatiotemporal data model, a prototype system is developed using existing 2D GIS techniques. A case study is performed using large-scale datasets of space-time paths and prisms. The case study indicates that the proposed spatiotemporal data model is effective and efficient for storing, managing, and querying large-scale datasets of network time geographic entities.  相似文献   

Use of biomarkers in environmental monitoring     

Paul K.S. Lam 《Ocean & Coastal Management》2009,52(7):348-354

Using specific examples, this paper discusses several key issues associated with the use of biomarkers, which could influence their effectiveness and usefulness. First, there are few biomarkers that are specific enough to allow an identification of the precise nature of environmental stressors. Second, biomarker studies conducted at molecular or subcellular levels tend to be more repeatable and predictable, but their ability to predict significant biological effects is limited. In contrast, biomarkers at physiological, organismic or higher levels are usually more ecologically relevant, but slower to respond and more difficult to detect. Third, some organisms have the ability to repair damage induced by initial toxic insults and make adjustments to their biological responses, thus increasing the chance of false negatives. Therefore, the selection of an appropriate biomarker for use under specific ecological circumstances will be a compromise that is determined by the precise question(s) asked and cost-benefit considerations.  相似文献   

Incorporating neighborhood scale effects into land loss modeling using semivariograms     

Cai  Heng  Lam  Nina S. N.  Zou  Lei 《Journal of Geographical Systems》2022,24(3):419-439

Journal of Geographical Systems - Scale effects are pervasive in geospatial modeling and affect the reliability of analysis results. This paper examines the neighborhood scale effects on the...  相似文献   

Relationships between tissue concentrations of paralytic shellfish toxins and antioxidative responses of clams, Ruditapes philippinarum     

Choi NM  Yeung LW  Siu WH  So IM  Jack RW  Hsieh DP  Wu RS  Lam PK 《Marine pollution bulletin》2006,52(5):572-578

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