Metabolism of benzo[a]pyrene in peroxynitrite/Fe（Ⅲ） porphyrin system

The peroxynitrite/porphyrin biomimetic system was established to investigate the effects of peroxynitrite on benzo[a]pyrene （B[a]P） metabolism. Three model systems consisting of different iron porphyrins were compared, and the results showed that the peroxynitdte/T（p-Cl）PPFeCl system was the highest catalytic efficiency in the metabolism of B [a]P. We analyzed the B [a]P metabolites produced from this system by RP-HPLC method and firstly identified the formation of nitrobenzo[a]pyrenes which are the special metabolites of B [a]P induced by peroxynitrite.     

筛板塔气提法处理生产AC发泡剂的含氨废水

采用板塔气提法处理ＡＣ发泡剂发生中的含氨废水，研究了筛板塔不同结构对空气吹脱除氨效率的影响，以及在筛板中吹脱氨的工艺条件。试验结果表明，在常温常压下，废水中含氨浓度为８００ｍｇ／ｌ，ｐＨ＞１２气液比为１２００时，经一级塔板吹脱，氨的去除率≥９０％。     

Early prenatal sonographic diagnosis of neuropathic arthrogryposis multiplex congenita with osseous heterotopia

A prenatal diagnosis of arthrogryposis multiplex congenita (AMC) has been carried out on a 19-week-old fetus by means of echography. The ultrasonographic characteristics were unnatural position of the four limbs associated with articular anomalies together with absence of active fetal movements. A therapeutic interruption of pregnancy was performed and the diagnosis was confirmed. At autopsy, architectural disorder of the motor neurons of the anterior medullary horn revealed a neuropathic pathogenesis of the arthrogryposis. Moreover, at the lumbar level the spinal cord was progressively replaced by heterotopic bony tissue which caused a more severe deformity of the lower limbs compared with the upper. The aspects of anatomo-pathological, genetic, and differential diagnosis are discussed showing the precocity of the prenatal diagnosis and the peculiarity of the aetiology of our case.     

Acute toxicity of DMAH to Oryzias latipes as modified by some influential factors

As a new insecticide,less information about the aquatic biological toxicity of DMAH [N-(2,4-dimethylphenyl)-N'-methylamidine hydrochloride]is known.Acute 96h static bioassays were conducted with Oryzias latipes to assess the toxicity of DMAH and the influence of environ- mental factors.The results indicated that,at 23℃,the 24h,48h and 96h LC⁵⁰ are 14.6 mg/L,13. 06 mg/L and 12.39 mg/L,respectively,the safe concentration (SC)of DMAH to Oryzias latipes is 1.16-1.32 mg/L.The changes of temperature,pH value and hardness of water will significantly influence the toxicity of DMAH to fish.     

某污水灌区居民胃癌高发的病因研究

某污水灌区居民恶性肿瘤死亡回顾调查发现,胃癌标化死亡率重污染地区明显高于一般污染区及对照区,是全国农村胃癌标化死亡率的3倍.通过污灌区居民临床体检和肠型胃癌的肠上皮抗原——α_2GP 对血清免疫学检测,发现胃癌高发与本地人群慢性萎缩性胃炎的粘膜肠上皮化生有密切联系,环境卫生与环境流行病学调查进一步证明污灌地区居民的胃粘膜肠上皮化生又和灌区污染的井水及稻米中某些矿物油、苯并(a)芘等污染物长期刺激有关,经试验均具有效突变活性.据此,作者初步提示了某污灌区居民胃癌的发生模型.     

氢氟烃HFC－134a的分解实验研究

该研究进行了氢氟烃ＨＦＣ－１３４ａ的催化分解和化学分解实验。实验结果表明无催化剂时ＨＦＣ－１３４ａ很稳定，即使升温至５００℃时也下会分解：在空气和水蒸汽存在下ＨＦＣ－１３４ａ催化分解成ＣＯ和ＣＯ＿２。ＣＦＣ－１２比ＨＦＣ－１３４ａ易分解，反应产物只有ＣＯ＿２。分解产物ＨＦ对催化剂有强烈的失活作用；超氧离子（Ｏ＿２￣－）对液相中的ＨＦＣ－１３４ａ具有很强的氧化分解能力。在常温下几乎可完全分解高浓度的ＨＦＣ－１３４ａ。     

漫游峨眉山

峨眉山位于成都西南约130km，主峰3099m，矗立在海拔不到500m的峨眉平原上。2600多米的高差造就了“一山有四季，十里不同天”的气候垂直分带。这使峨眉山有着非常丰富的动、植物资源，拥有3200多种植物，享有“植物王国”、“绿色宝库”的美称；拥有2300多种动物。这造成了峨眉山优美、秀丽的景色。峨眉山是中国佛教胜地的四大名山之一。孕育了悠久、灿烂的佛教文化。“蜀国多仙山，峨眉邈难四”。漫游雄、秀、幽、奇的峨眉山，足聆听一曲雄浑、优美的祖国颂歌。     

酸性铬深蓝-示波吸附计时电位法快速测定土壤溶液中不同形态铝

报道了酸性铬深蓝-示波吸附计时电位法分别在酸性和碱性条件下直接检测土壤溶液中的无机单核铝[AIi]和总单核铝[AIa]浓度，并用该法测定了酸消化水样中的总铝[AIT]．由[AI8]-[AIi]间接得到有机单核铝[AIo]，[AIT]-[AIa]得到酸溶态铝[AIr]，从而实现了土壤溶液中5种AI形态的电化学测定测定了十多个实际土壤水样，与Driscoll方法所获结果进行了对照，结果基本一致。     

燃油助动车与柴油车尾气冷凝物中有机污染物的比对分析

采用毛细管柱气相色谱-质谱联用(GC／MS)及选择离子检测(SIR)技术。结合超声波回流提取和柱层析化学分组预分离的前处理方法．了解燃油助动车与柴油车尾气冷凝物中有机污染物的化学组成。在2类尾气冷凝颗粒物中分别检出234种与144种有机化合物及同分异构体。均含有已知是人类致癌物的4～6环多环芳烃，柴油车尾气中苯并[a]芘含量为11—27μg／g。燃油助动车比柴油车燃烧效率更差．其尾气颗粒物对人体慢性毒性效应可能更严重。实验结果警示人们应尽快改进发动机机械性能．尤其是先天结构不甚合理的二冲程单缸发动机的燃油助动车．研究开发环保型机动车．严格控制并净化尾气有害物排放。     

浅述中国森林植被保护与可持续发展

人类为了满足生活和生产的需求,对森林资源的过度索取,已造成森林植被的毁坏及生态系统的自动调节能力的破坏,引起了生态失调甚至造成生态系统崩溃.森林植被破坏对人类社会发展造成了气候异常、温室效应等恶果.为此提倡中国的森林植被保护与可持续发展要从法制和管理方面入手,达到改善生态环境和森林资源持续发展及利用的目的.