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In order to estimate the biodegradation of three polycyclic aromatic hydrocarbons (PAHs) compounds, bacterial strains were isolated from marine sediments in three heavily contaminated sites (Yuandang Lake, Dongdu Port and Aquacultural zones in Maluan Bay) in Xiamen Western Sea. The results show three bacterial strains, which used pyrene as the sole carbon source, were identified as strains of Aureobacterium sp.,Arthrobacter sp., Rhodococcus sp. The PAH-degrading bacteria isolated had a strong ability to degrade phenanhrene, fluoranthene and pyrene at different degradation rates. The highest degradation rate was observed when three PAH compounds were mixed with an individual strain in the medium. The three PAHs were degraded after one week with a degradation rate of 89.94 % for phenanthrene and 93.4 % for both of fluoranthene and pyrene.In addition, after 25 days of incubation, the degradation rate was 99.98 % for phenanthrene and 99.97 % for both of fluoranthene and pyrene. Optical density was measured to estimate bacterial growth during the degradation of PAHs. Highest levels of bacterial growth were observed with a three PAH mixture in the culture, suggesting that the concentration of PAHs influenced bacterial growth and the highest levels of degradation for most series were detected after one week of incubation.  相似文献   
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泉州湾近岸海域水质状况调查与评价   总被引:20,自引:2,他引:18  
在2001年1~12月期间,对泉州湾近岸海域水质进行了3期的监测,对样品的水温及pH值、盐度、溶解氧、化学需氧量、氨氮、亚硝酸盐、硝酸盐、活性磷酸盐、总汞、铜、铅、镉、石油类等14项理化指标进行了测定,并对该湾水质现状进行评价.其结果表明无机氮含量测值100%超四类海水水质标准值,活性磷酸盐含量基本符合二类海水水质标准值(超标率为33%),其他指标测值均符合二类海水水质标准值,营养指数E值为23(>1),属富营养型.  相似文献   
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利用血凝试验及糖抑制试验测定一种绒螯蟹的血清及肌肉提取液的凝血活性及糖抑制专一性,同时进行热稳定性、pH及Ca^2 影响试验。结果显示:血清只能凝集9种红细胞,肌肉提取液能凝集12种红细胞。血清对鹌鹁红细胞的凝集可被乳糖、D-甘露糖、D-果糖、D-半乳糖4种糖所抑制,最小抑制浓度均为200mmol/L,其凝集活性均依赖于Ca^2 ,在pH为6.0~7.0范围内较稳定,经50℃保温10min后活性完全消失。肌肉提取液只被D-甘露糖抑制,在pH为4.0~10.0、温度为4℃~90℃范围内均具活性,说明有很强的耐热性,其凝集活性不依赖于Ca。以上结果表明:血清与肌肉提取液均含有凝集素,且凝集素的种类不同。  相似文献   
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本文以西藏龙木错与结则茶卡为对象,研究了两盐湖卤水在不同兑卤比情况下,混合卤各组分的变化,并对兑卤后的混合卤水进行了15°C蒸发过程的研究。实验分别对两种原料卤水和兑卤后卤水蒸发所得的9个卤水样品进行了常量化学组分分析,研究了兑卤后卤水蒸发过程中盐类的富集行为和析出规律。混合卤蒸发析盐规律结果基本符合Na+、K+、Mg2+//Cl–、24SO?-H2O(15°C)五元水盐体系相图。  相似文献   
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