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Measurement and analysis of ozone, ultraviolet b and aerosol light scattering coefficients in the Arctic

Advances in Polar Science 2011年第4期22卷 260-265页

作者： LAI Xin bIAN Lingen LU Changgui TANG Jie Chinese Academy of Meteorological Sciences Beijing 100081 China Meteorological Observation Center of China Meteorological Administration Beijing 100081 China

Tropospheric ozone （O3）, ultraviolet b （UVb） radiation and aerosol light scattering coefficients （SC） were investigated on a cruise ship during the fourth Chinese National Arctic Research Expedition from July 1 September 20, 2010. The results showed that O3, UVb and SC decreased with increasing latitude, with minimum values recorded in the central Arctic Ocean. Average O3 concentrations were 15.9 ppbv and 15.1 ppbv in the bering Sea and Arctic Ocean, respectively. Ozone concentrations increased to 17.5 ppbv in the high Arctic region. Average UVb values were 0.26 W.m-2 and 0.14 W.m-2 in the bering Sea and Arctic Ocean, respectively. The average SC in the bering Sea was 4.3 M.m-1, more than twice the value measured in the Arctic Ocean, which had an average value of 1.7 M.m-1. Overall, UVb and SC values were stable in the central Arctic Ocean.

关键词： Arctic Ocean tropospheric ozone ultraviolet b radiation aerosol light scattering coefficient

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Molecular markers for UV-b stress in plants:alteration of the expression of four classes of genes in Pisum sativum and the formation of high molecular mass RNA adducts

Molecular markers for UV-B stress in plants:alteration of th...

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贵州省环境诱变剂学会第二届学术交流会

作者： Mikael brosché Camilla Fant Sharon W.bergkvist Hilja Strid Anna Svensk Olof Olssonb ke Strida Avdelningen fr biokemi och biofysik Institutionen fr KemiGteborgs UniversitetP.O.Box 462S-405 30 GteborgSweden a Avdelningen fr biokemi och biofysik Institutionen fr KemiGteborgs UniversitetP.O.Box 462S-405 30 GteborgSweden Avdelningen fr Molekylrbiologi Institutionen fr Cell-och MolekylrbiologiGteborgs UniversitetP.O.Box 462S-405 30 GteborgSweden

Sixteen ultraviolet-b radiation-regulated pea genes were ***,the corresponding proteins were divided into four groups.(i)Chloroplast-localized *** for these proteins were down-regulated,underlining the deleterious effects of UV-b on this organelle.A novel down-regulated photosystem I light-harvesting chlorophyll a/b-binding protein gene(PsLhcA4),was cloned and sequenced.(ii) Protein turnover *** of mature mRNAs for the PU1 and PsUbC4 genes,encoding proteins of the ubiquitin protein degradation pathway,were up-and down-regulated,respectively,implying alteration of plant cell protein content by changes in both gene expression and protein degradation.(iii)Proteins involved in intracellular *** of genes for small GTPases,rab and rho homologues,were altered.(iv) Phenylpropanoid or flavonoid *** of three genes encoding enzymes in these pathways were up-regulated and one of them,the novel PsC450R1,was cloned and ***,unexpected high molecular mass psbA RNA adducts were found to appear after UV-b *** addition,a large increase in corresponding high molecular mass adducts were also found for PsLhcA4,and PsUbC4 mRNA and 23S *** RNA species do not contain protein and probably appear due to cross-linking of two or more RNA molecules,or are the result of UV-b-indueed failure of transcription termination.

关键词： Defence gene Differential gene expression Molecular marker Photosynthetic gene ultraviolet b radiation (Pisum sativum)

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