红树林厌氧环境对多环芳烃类有毒物的降解预测

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红树林是连接陆地和海洋的重要生态系统,由于潮汐活动,氧化还原条件表现出明显的昼夜间的交替,这一生态体系中不但有大量的动植物种类,同时还有数量极高的不同种类的细菌,包括好氧和厌氧类型,厌养的硫酸(盐)还原菌已证实在降解多环芳烃有机物方面有其独特的生化优势,但从红树林中分离出的此类纯细菌还很少,在降解方面,已初步确定萘的厌氧降解途径异于好氧细菌,厌氧降解时的一系列代谢中间产物也有明显的专一性,羰基化反应是开始的一个重要步骤,而后的每步生化反应还有待进一步验证.从现有的结果可以看出,红树林中厌养的硫酸还原菌应在降解多环芳烃有机物中起到非常重要的作用.

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	梁佩芝
	顾继东

关键词 ：红树林, 厌养的硫酸还原菌, 多环芳烃, 降解途径

Abstract：

Mangroves are vulnerable habitats to pollution and accumulation of polycyclic aromatic hydrocarbons (PAHs).Many studies have reported the aerobic biochemical pathways of PAH degradation by bacteria and fungi but little is known about the anaerobic ones.In this paper,naphthalene was used as a model compound for PAHs demonstrating the possible anaerobic degradation pathways in mangrove environments.Oxidation of naphthalene was firstly found under anaerobic conditions in sediment columns and subsequently under strict anaerobic conditions and the processes were proved to be sulfate-reducing dependent by testing with sodium molybdate,a specific inhibitor of sulfate reduction.Further detailed studies isolated and identified several intermediates such as 2-naphthoate,5,6,7,8-tetrahydro-2-NA and decalin-2-carboxylate during the transformation processes of naphthalene.In these studies,different initial steps (hydroxylation or carboxylation) were proposed for naphthalene degradation.However,specific transformation steps for naphthalene will need further investigation to elucidate if degradation pathway of benzoate is involved.

Key words： Mangrove Pathway Polyaromatic hardrocarbons(PAHs) Sulfate-reducing bacteria

收稿日期: 2003-04-25

X131.3

基金资助:香港ITF项目

引用本文:

梁佩芝, 顾继东*. 红树林厌氧环境对多环芳烃类有毒物的降解预测[J]. , 2003, 22(2): 97-103.
LIANG Pei-zhi, GU Ji-dong. Potential Degradation of Polyaromatic Hydrocarbons Under Anaerobic Conditions of Mangrove Ecosystem. , 2003, 22(2): 97-103.

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http://www.ecolsci.com/CN/Y2003/V22/I2/97

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