沪杭高速公路嘉善段道路声屏障的设计及降噪效果

在详细调查沪杭高速公路喜善张家浜中桥路段（试验路段）未建道路声屏障噪声情况的基础上，介绍了试验路段工程概况及道路声屏障的设计，并分析了声屏障的现场降噪效果，试验路段声屏障的声学指标达到预期目标，具有良好的环境效益。     

Effects of acid deposition on forests in south China

１ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｆａｓｔｇｒｏｗｉｎｇｏｆｍｏｄｅｒｎｉｎｄｕｓｔｒｙａｎｄｓｈａｒｐｌｙｉｎｃｒｅａｓｉｎｇｏｆｅｎｅｒｇｙｃｏｎｓｕｍｐｔｉｏｎｐｒｉｍａｒｉｌｙｃｏａｌ，ａｉｒｐｏｌｕｔｉｏｎａｎｄａｃｉｄｄｅｐｏｓｉｔ...     

鞍山市双岭水泥厂污染状况调查及环境影响防治对策

通过对鞍山市双岭水泥厂污染源及周边环境的调查监测，搞清污染物的主要来源、厂区周边空气环境的质量，并评价了该厂对周边环境的影响。     

Synergistic effect of F and triggered oxygen vacancies over F-TiO2 on enhancing NO ozonation

Oxidation-absorption technology is a key step for NO_x removal from low-temperature gas. Under the condition of low O₃ concentration (O₃/NO molar ratio = 0.6), F-TiO₂ (F-TiO₂), which is cheap and environmentally friendly, has been prepared as ozonation catalysts for NO oxidation. Catalytic activity tests performed at 120°C showed that the NO oxidation efficiency of F-TiO₂ samples was higher than that of TiO₂ (about 43.7%), and the NO oxidation efficiency of F-TiO₂-0.15 was the highest, which was 65.3%. Combined with physicochemical characteristics of catalysts and the analysis of active species, it was found that there was a synergistic effect between F sites and oxygen vacancies on F-TiO₂, which could accelerate the transformation of monomolecular O₃ into multi-molecule singlet oxygen (¹O₂), thus promoting the selective oxidation of NO to NO₂. The oxidation reaction of NO on F-TiO₂-0.15 follows the Eley-Rideal mechanism, that is, gaseous NO reacts with adsorbed O₃ and finally form NO₂.     

煤沥青烟气对大鼠肺损伤及免疫功能的影响

采用自然吸入的暴露方法，通过分析肺灌洗液成分及脾脏淋巴细胞的转化功能，观察碳素厂冷压车间空气对大鼠肺损伤及免疫功能的影响，结果表明，在自然吸入染毒期间，引起大鼠肺灌洗液中乳酸氢酶、酸性磷酸酶和唾液含量或高，肺巨噬细胞及其Ｆｃ受体数降低，并且还引起脾脏淋巴细胞的转化能力下降。     

PO4^3-和柠檬酸对稀土元素在小麦体内积累和分异的影响

基于营养液培养,添加外源稀土和ICP-MS分析技术,研究了无机配体PO43-(Pi)及有机配体柠檬酸(Cit)对小麦器官中稀土元素积累和分异的影响.结果表明,不同Pi水平对小麦根中的稀土总含量(∑REE)影响较小,但显著降低叶中∑REE含量;而不同Cit水平对小麦根、叶中∑REE含量都有明显降低作用.对照植物(无Pi、Cit添加)中,稀土元素在小麦根中具有中稀土(MREE)富集及M-型四重效应分布特征,叶中有重稀土(HREE)富集及W-型四重效应分布特征.不同Pi处理对四重效应无明显作用,但进一步加强HREE在小麦叶片中的富集.添加柠檬酸使对照植物根和叶中的分异有逐渐减弱的趋势,在高浓度处理时(Cit≥150μmol.L-1),小麦根和叶中出现轻稀土(LREE)富集.     

取代苯类化合物的二维息定量结构-活性相关研究

为了预测非反应性麻醉型化合物对发光菌的发光半抑制浓度,评价该类化合物的毒性效应,采用独特的二维HQSAR分析方法,根据分子碎片的类型,将分子结构转变成具有特征的分子指纹,并用数字进行标记。这些标记出的数字作为QSAR的描述符,经过偏最小二乘法计算,建立起化合物结构与生物毒性之间的相关关系,由此所获得的HQSAR预测值与实测值之间也存在较好的相关性,即-1g_(pre)EC_(50)=0.311 0.929(-1g_(exp)EC_(50))(n=13,r=0.964)。这一模型的预测效果明显优于传统的二维QSAR模型,其结果可以为定量评估同类化合物的生物毒性提供可靠依据。     

Interfacial effects of suspended particles on biodegradation of N (2,4 dimethyl phenyl) N'' methylformamidine hydrochloride and dibutyl phthalate in waters

ＩｎｔｅｒｆａｃｉａｌｅｆｅｃｔｓｏｆｓｕｓｐｅｎｄｅｄｐａｒｔｉｃｌｅｓｏｎｂｉｏｄｅｇｒａｄａｔｉｏｎｏｆＮ（２，４ｄｉｍｅｔｈｙｌｐｈｅｎｙｌ）Ｎ’ｍｅｔｈｙｌｆｏｒｍａｍｉｄｉｎｅｈｙｄｒｏｃｈｌｏｒｉｄｅａｎｄｄｉｂｕｔｙｌｐｈｔｈ...     

滞洪型平原水库蓄水对水环境影响分析及其协同调控研究

本文通过滞洪型水库运行机理的介绍,以石佛寺水库为例,提出利用地表水和地下水协同调控解决蓄水带来的环境负效应,通过建立库区水环境统一模型,利用数值模拟方法分析预测水库蓄水对环境的影响,并对解决水库蓄水产生的环境负效应进行方案的优化选择,最终提出地表水库蓄水和地下水库供水的最优方案.     

Sex-dependent obesogenic effect of tetracycline on Drosophila melanogaster deteriorated by dysrhythmia

Antibiotics have been identified as obesogens contributing to the prevalence of obesity. Moreover, their environmental toxicity shows sex dependence, which might also explain the sex-dependent obesity observed. Yet, the direct evidence for such a connection and the underlying mechanisms remain to be explored. In this study, the effects of tetracycline, which is a representative antibiotic found in both environmental and food samples, on Drosophila melanogaster were studied with consideration of both sex and circadian rhythms (represented by the eclosion rhythm). Results showed that in morning-eclosed adults, tetracycline significantly stimulated the body weight of females (AM females) at 0.1, 1.0, 10.0 and 100.0 µg/L, while tetracycline only stimulated the body weight of males (AM males) at 1.0 µg/L. In the afternoon-eclosed adults, tetracycline significantly stimulated the body weight of females (PM females) at 0.1, 1.0 and 100.0 µg/L, while it showed more significant stimulation in males (PM males) at all concentrations. Notably, the stimulation levels were the greatest in PM males among all the adults. The results showed the clear sex dependence of the obesogenic effects, which was diminished by dysrhythmia. Further biochemical assays and clustering analysis suggested that the sex- and rhythm-dependent obesogenic effects resulted from the bias toward lipogenesis against lipolysis. Moreover, they were closely related to the preference for the energy storage forms of lactate and glucose and also to the presence of excessive insulin, with the involvement of glucolipid metabolism. Such relationships indicated potential bridges between the obesogenic effects of pollutants and other diseases, e.g., cancer and diabetes.