Human impacts on the terrestrial ecosystem of Fildes Peninsula of King George Island, Antarctica

Ｓｉｎｃｅｔｈｅｉｎｔｅｒｎａｔｉｏｎａｌｇｅｏｐｈｙｓｉｃａｌｙｅａｒ(ＩＧＹ,1957—1958),Ａｎｔａｒｃｔｉｃａｈａｓｂｅｅｎｔｈｅｏｂｊｅｃｔｏｆｉｎｔｅｎｓｉｖｅｓｃｉｅｎｔｉｆｉｃｉｎｖｅｓｔｉｇａｔｉｏｎｂｙｔｅａｍｓｏｆｓｃｉｅｎｔｉｓｔｓ...     

Response of cucumber plants to increased UV-B radiation under water stress

ＩｎｔｒｏｄｕｃｔｉｏｎＤｕｒｉｎｇｔｈｅｐａｓｔｓｅｖｅｒａｌｄｅｃａｄｅｓｎｕｍｅｒｏｕｓｉｎｖｅｓｔｉｇａｔｉｏｎｓｏｎｐｒｏｄｕｃｔｉｖｉｔｙ,ｐｈｙｓｉｏｌｏｇｙａｎｄｅｃｏｌｏｇｙｏｆｐｌａｎｔｓｓｕｂｊｅｃｔｅｄｔｏｔｈｅｉｎｃｒｅａｓ?..     

黑龙江化工总厂废水处理试验研究

黑龙江省化工总厂针对化肥改扩建后的废水水质情况,采用悬浮污泥法Ａ／Ｏ生物脱氮工艺和生物膜法Ａ／Ｏ生物脱氮工艺进行废水处理试验,结果表明,生物膜法Ａ／Ｏ生物脱氮地废水中的总氮具有较好的去除效果,在废水碳氮比偏低的情况下,总氮的去除率可达到８４％左右。     

Effect of natural aquatic humic substances on the photodegradation of bisphenol A

The photochemical degradation of bisphenol A (BPA) was studied in the presence of natural humic substances from different origins under simulated solar irradiation. BPA underwent insignificant direct photolysis in neutral water, but rapid photosensitized degradation in four humic substances solutions via pseudo-first-order reaction occurred. The photo-degradation rate of BPA was insensitive to the different initial BPA concentrations and was inhibited in aerated solution compared with the deoxygenated medium. The reactive oxygen species (ROS) such as ·OH and ¹O₂ produced from excitation of humic substances under irradiation was determined from the quenching kinetic experiment using molecular probe. The five main intermediate photoproducts of BPA in Nordic lake fulvic acid (NOFA) were tentatively identified using gas chromatography/mass spectrometer (GC/MS). Based on the identification of ROS and the analysis of photoproduct formation, the possible phototransformation pathways of BPA were proposed, involving the direct photolysis due to the energy transfer from the triplet state humic substance (³HS*) to BPA molecules and hydroxyl radical addition and oxidation as well. Translated from Acta Scientiae Circumstantiae, 2005, 25(6): 816–820 [译自: 环境科学学报]     

Properties of polyferric-silicate-sulfate(PFSS) coagulant

ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｍｅｔａｌｉｏｎｓ,ｔｈｅｈｉｇｈｌｙｐｏｌｙｍｅｒｉｚｅｄｐｏｌｙｓｉｌｉｃｉｃａｃｉｄｃａｎｇｉｖｅｎａｎｅｘｃｅｌｌｅｎｔｃｏａｇｕｌａｔｉｏｎｐｅｒｆｏｒｍａｎｃｅｉｎｗａｔｅｒｔｒｅａｔｍｅｎｔ(Ｔａｋａｏ,19...     

从钛铁渣中回收钛和铝——(二)回收铝

提出了一种从钛铁渣中提取大量铝的方法.研究了将钛铁渣酸解液中大量铝合成洗涤助剂用4A沸石的工艺条件,得到了合格的4A沸石产品,铝的回收率约为89%.探讨了导向剂在合成沸石中的应用,并对4A沸石产品的物性进行了表征.     

Determnation of ochratoxin A in grain by monoclonal antibody-based enzyme-linked immunosorbent assay

ＤｅｔｅｒｍｎａｔｉｏｎｏｆｏｃｈｒａｔｏｘｉｎＡｉｎｇｒａｉｎｂｙｍｏｎｏｃｌｏｎａｌａｎｔｉｂｏｄｙ－ｂａｓｅｄｅｎｚｙｍｅ－ｌｉｎｋｅｄｉｍｍｕｎｏｓｏｒｂｅｎｔａｓｓａｙＹａｎｇＣｈｕａｎｈｅ；ＬｕｏＸｕｅｙｕｎ；ＬｉｕＣｈａｎｇ；ＬｉＷｅｎ...     

旱地作物根际和非根际土壤硝酸盐异化还原成铵细菌群落组成的研究

为研究典型旱地农田土壤硝酸盐异化还原成铵过程(Dissimilatory nitrate reduction to ammonium,DNRA)的群落组成,针对DNRA过程的功能基因nrfA进行高通量测序.根际和非根际、4种典型农作物共16个样品,质控后每个样品得到87000条序列,在相似度≥90%下划分到27952个OTUs,选取其中丰度较高的258个代表OTUs进行生态学分析.多样性分析(OTUs水平)结果表明:3/4的作物根际土壤样品中的DNRA群落丰富度、物种多样性和物种均匀度高于相应非根际样品,对比4种作物,粟作物根部土壤DNRA群落多样性最高,玉米作物非根际土壤最低.对代表OTUs进行分类,共定义到6个门(Phylum),19个属(Genus).其中相对丰度最高的3个属为Hyalangium(29.31%)、Chthoniobacter(20.33%)和Nitrospira(13.41%),表明三者在群落组成中占主导地位.结合土壤理化因子分析,DNRA群落相对丰度与NO~-_2-N、TN、含水率、TOM、pH及温度呈显著相关关系.本研究在一定程度上揭示了旱地农田土壤DNRA细菌的群落组成、多样性及与土壤环境因子的关系,为提高氮肥的利用效率和减小环境污染提供理论依据.     

Differences of cadmium absorption and accumulation in selected vegetable crops

ＩｎｔｒｏｄｕｃｔｉｏｎＣａｄｍｉｕｍｉｓｐｒｉｎｃｉｐａｌｌｙｄｉｓｐｅｒｓｅｄｉｎｎａｔｕｒａｌａｎｄａｇｒｉｃｕｌｔｕｒａｌｅｎｖｉｒｏｎｍｅｎｔｓｔｈｒｏｕｇｈｖａｒｉｏｕｓａｇｒｉｃｕｌｔｕｒａｌ,ｍｉｎｉｎｇａｎｄｉｎｄｕｓｔｒｉａｌａｃｔｉｖｉｔｉｅｓａｓｗｅｌｌａｓｒｅｓｕｌｔｉｎｇｆｒｏｍｔｈｅｅｘｈａｕｓｔｇａｓｅｓｏｆａｕｔｏｍｏｂｉｌｅｓ(Ｄａｓ,1 997) .Ｔｈｉｓｔｒａｃｅｍｅｔａｌｉｓｔｈｅｐｏｌｌｕｔａｎｔａｎｄｐｏｔｅｎｔｉａｌｔｏｘｉｎｔｈａｔｈａｓｕｎｋｎｏｗｎｆ…     

Purification of AS-CMP effluent by combined photosynthetic bacteria and coagulation treatment

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｐｕｌｐａｎｄｐａｐｅｒｉｎｄｕｓｔｒｙｉｓａｍａｊｏｒｃｏｎｔｒｉｂｕｔｏｒｔｏｗａｔｅｒｐｏｌｌｕｔｉｏｎｉｎＣｈｉｎａ.Ｉｎ1995,ｔｈｅｗａｓｔｅｗａｔｅｒｄｉｓｃｈａｒｇｅｄｂｙｐｕｌｐａｎｄｐａｐｅｒｉｎｄｕｓｔ...