Dissertation > Excellent graduate degree dissertation topics show

The Biotoxicity and Bioaccumulation of Chlorinated Flame Retardants Dechlorane Plus on Marine Algae

Author: JiangTao
Tutor: SunYeQing
School: Dalian Maritime University
Course: Biophysics
Keywords: Dechlorane Plus Algae Oxidative stress Photosynthesis Bioaccumulation
CLC: X173
Type: Master's thesis
Year: 2011
Downloads: 100
Quote: 0
Read: Download Dissertation

Abstract


As a class of chlorinated flame retardants, Dechlorane Plus (DP) is widely used in materials manufacture. With DP was detected in seawater, sediment and fish samples, the impacts of DP on the marine environment are drawing both international and local researchers’wide attentions. However, the toxicology data of DP was only reported by Oxychem (the DP manufacturer in USA), and the potential toxicity effects on marine algae have not been reported yet. Marine algae are primary producers in marine ecosystem, and they are the best bioindicator to monitor marine environment. In order to evaluate the potential toxicity effects and bioaccumulation on marine algae, we used two kinds of marine algae (Chlorella vulgaris and Ulva pertusa) for our research. Main research results show as follows:Ⅰ.Because of the poorly solubility in the water, We had three kinds of DP exposure methods:(i)DP solution used acetone as the solvent;(ii)directly exposure;(iii)the suspension of DP. No significant growth inhibition of Chlorella vulgaris was determined in three methods of DP exposure. NOEC>100mg/L. The suspension of DP is the best method of DP toxicity research.Ⅱ. The suspension of DP exposure produced oxidative damage to Chlorella vulgaris. The activity of antioxidant enzyme SOD increased significantly, and the lipid peroxide product MDA remarkably increased. The chlorophyll a contents and the utilization efficiency of inorganic carbon had decreased, but the expression of gene rbcL had increased significantly, suggested that the suspension of DP exposure could affect the photosynthesis system in algae.Ⅲ. With the suspension of DP exposure, the growth of Ulva pertusa decreased in treatment groups compared to controls. The bioaccumulation of DP by Ulva pertusa was observed.Ⅳ.DP was determined at 6 sampling sites near the Dalian seashore area in 2010, and DP was detected in all of the water, sediment and Ulva pertusa samples. The fsyn for Ulva pertusa (0.25) was lower than that of the Chinese commercial product (0.41).Our results suggested that DP showed low toxicity to marine algae. No significant growth inhibition of Chlorella vulgaris was determined, but DP exposure could produce oxidative damage and affect on algae photosynthesis system. SOD, MDA and the utilization efficiency of inorganic carbon could be used as sensitive biomarkers in the DP stress test. DP exposure could inhibit the growth of Ulva pertusa, and the bioaccumulation of DP in Ulva pertusa had been observed.

Related Dissertations

  1. Study on the Secondary Metabolites of Two Fungi from the South China Sea,R284
  2. Effects of Pre-Anthesis Drought Hardening on Grain Yield and Quality Formation in Wheat under Post-Anthesis Drought and Its Physiological Mechanism,S512.1
  3. Regulation of 5-Aminolevulinic Acid (ALA) on Leaf Photosynthesis of Pear (Pyrus Pyrifolia Nakai),S661.2
  4. Effect of HCO3-, K+ and HSO3- on rbcL and rbcS Gene Expression and Photosynthesis of Soybean Seedlings,S565.1
  5. Effects of Allopurinol on Cardiac Function in Patients with Diastolic Heart Failure,R541.6
  6. Expression and Role of Uncoupling Protein 2 in the Kidney of Mouse after Ischemia Reperfusion,R587.1
  7. The Study on Regulating Effects and Mechanism of Laminaria Japonica on Serum Lipid of Experimental Hyperlipenmia,R285.5
  8. The Expression of DNA Adducts dA in Chronic Atrophis Gastritis, Precancerous Lesions and Gastric Cancer and the Relationship with the CYP2E1 Gene Polymorphism,R735.2
  9. Oridonin preconditioning on rat hepatic resection autologous transplantation ischemia -reperfusion injury in rats and its mechanism,R657.3
  10. The Investigation of the Mechanism of Reno-protective Effect on 3/4 Nephrectomized Rats with Different Protein Diets,R692
  11. The Application of Multivariate Analysis and Excitation-Emission Matrix Fluorescence Spectroscopy of Dissolved Organic Matter in the Identification of Red Tide Algae,X55
  12. The Research of Six Different Zenia Insignis Chun of Photosynthesis,S792.99
  13. Study on the Photosynthetic Bacteria with UASB Process Treatment of High～Salinity Organic Wastewater,X703
  14. Study on Effects of the Extractions of Perilla Seed on Nonalcoholic Fatty Liver Disease in Rabbits,R285.5
  15. Studies on the Isolation, Identification, and Antitumor Bioactivities of Fucoxanthin in Algae,R285
  16. Studies on the Enhanced Production of Polysialic Acid and Preparation of Sialic Acid,TQ460.1
  17. Effects of Drought Stress on Physioecological Characteristics of Typical Plants in the Ecotone between Dry Valley and Mountain Forest,Q948
  18. Nitrogen and phosphorus on Jatropha seedling growth and cold Measures,S794.9
  19. Study on the Extraction Technology of Natural Pigments of Blue Aglae in Taihu Lake,TS264.4
  20. The Research on Gas Flotation Process of Blue Green Aglae and Its Comprehensive Utilization,X70
  21. The Toxic Responses of the Polychaete (Periereis Nuntia Savigy) to the Benzo[A]Pyrene,X174

CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Biology > Environmental botany
© 2012 www.DissertationTopic.Net  Mobile