Structure analysis of the complete mitochondrial genome in cultivation variety ��Rongfu��

In this report, complete mitochondrial genome sequences of Laminaria cultivation variety ‘Rongfu’ were obtained. The results showed the length of circular molecule of mtDNA was 37 638 bp (64.7% A+T), encoding three rRNAs (23S, 16S and 5S), 25 tRNAs, 35 known mitochondrial proteins and 3 ORFs. Sequence alignment indicated its mtDNA genome was very similar to that of Laminaria japonica. Phylogenetic trees inferred from concatenated 30 mitochondrial genes showed that ‘Rongfu’, Laminaria japonica, Laminaria longipedalis, Laminaria diabolica, Laminaria religiosa and Laminaria ochotensis clustered together. In addition, compared with mitochondrial genome of L. japonica, ‘Rongfu’ mtDNA lacked a non-coding region of 19 nucleotides, which was located between rRNA small subunit gene 3 (rps3) and rRNA small subunit gene 9 (rps9). Seven cultivation varieties of China were divided into two groups based on this non-coding region which was absent in ‘Rongfu’, ‘Fujian’ and ‘Sanhai’ while present in ‘Ailunwan’, ‘Dongfang No.2’, ‘Dongfang No.3’ and ‘Zaohoucheng’. So this variation can be used in germplasm identification of cultivation variety.     

Phytoplankton pigment patterns and community composition in the northern South China Sea during winter

Phytoplankton pigment patterns and community composition were investigated in the northern South China Sea using high-performance liquid chromatography and the CHEMTAX software from February 11 to 23, 2009. We recognized four different vertical distribution patterns of pigments: chlorophyll a (Chl a)-like type, divinyl chlorophyll a (DV Chl a) type, even distribution type, and surface type. The average value of ratios of accessory photo-protective pigments (APP) to accessory photo-synthetic pigments was 0.89±0.63 in the upper 50 m and 0.16±0.06 below 50 m depth. With increasing depth, APP decreased and photo-synthetically active radiation was attenuated. There was an obvious succession in the phytoplankton community from inshore to the open sea. Diatoms were dominant in the inshore region, while pelagophytes, Prochlorococcus, cyanobacteria and prymnesiophytes were dominant in the open sea. The vertical distribution of phytoplankton also differed greatly from inshore to the open sea. In the coastal and shelf region, diatoms were important components in the whole water column. Cyanobacteria also had a high abundance at the Subsurface Chlorophyll a Maxima (SCM) in the shelf region. In the slope and open sea, Prochlorococcus and cyanobacteria were important groups above the SCM, while pelagophytes dominated below the SCM.     

东营市湿地资源分布及地质环境脆弱性评价

通过遥感解译、水土样测试、环境地质调查,从地表水、坑塘水、平原水库、浅层地下水、土壤环境的质量评价入手,查明了东营市湿地的分布现状,分析湿地演变与地质环境条件之间的相关性,构建东营湿地地质环境脆弱性评价体系并进行了脆弱性评价,为促进湿地生态系统与区域地质环境协调发展提供科学依据。     

山东济宁金乡大蒜产地重金属在土壤—农作物中迁移转化特征研究

基于金乡县南部地区土地质量地球化学调查与评价项目,系统采集表层土壤和大蒜样品,对As、Cd、Cr、Cu、Hg、Ni、Pb、Zn共8种重金属元素全量及形态数据进行深入分析,研究发现,土壤重金属形态除Cd、Hg外以残渣态占绝对优势;重金属生物可利用系数与SOM、pH、CEC均呈负相关;大蒜植株不同部位对元素的富集特征具有明显差异性,As、Cd、Cr、Pb、Ni、Cu、Zn表现为须根>叶身>假茎>蒜头;蒜头Cd与土壤Cd全量呈显著性正相关,其余元素与对应土壤中全量相关关系不明显。     

Hard X-ray Source Distributions on EUV Bright Kernels in a Solar Flare

We explore the hard X-ray source distributions of an C1.1 flare occurred on 14 December 2007. Both Hinode/EIS and RHESSI observations are used. One of EIS rasters perfectly covers the double hard X-ray footpoints, where the EUV emission appears strong from the cool line of He ii (log T=4.7) to the hot line of Fe xvi (log T=6.4). We analyze RHESSI X-ray images at different energies and different times before the hard X-ray maximum. The results show a similar topology for the time-dependent source distribution (i.e. at 14:14:35 UT) as that for energy-dependent source distribution (i.e. at a given energy band of 6 – 9 keV) overlapped on EUV bright kernels, which seems to be consistent with the evaporation model.     

基于GIS的磐石市地下水环境质量分析

基于ArcGIS建立了磐石市29个监测点的水质信息数据库,采用灰色聚类法进行地下水环境质量评价。利用GIS的空间分析功能,分析地下水中常规组分的空间分布特征,掌握了地下水质量状况。磐石市大部分地区地下水质量良好,达到、级标准。地下水中化学组分的含量从郊区向市区逐渐增加,市区地下水质量为、级标准。地下水已遭受污染,地下水开采降落漏斗区地下水位的持续下降是市区地下水遭受污染的主要诱发因素。     

Identification and sequence of a cDNA clone corresponding to a gene involved in development ofUndaria pinnatifida

During the induction of gamete-producing gametangia, induced gametophytes were collected at 4 days intervals (0,4,8,12 d) and total RNAs were isolated by CsCl gradient ultracentrifugation. Some stage-specific expressed mRNAs were identified by differential display of mRNAs from different developing stages of the gametophytes. The cDNA of one specific mRNA was verified, cloned and sequenced. This gene was specifically expressed during 4 days of induction, and had partial homologous sequence with tobacco IAA-binding protein gene. It suggests that this cDNA may represent a gene which is related to the IAA regulating function during the development of the gametophytes.

     

日冕物质抛射的理想MHD模型研究

概括了日冕物质抛射的一些观测结果和它们与其它太阳活动现象的相关性。简要回顾了较早期日冕物质抛射的理论研究,着重介绍了最近研究得较多的理论机制,即能量储存机制,以及其中的磁通量绳突变模型与其它理论模型的MHD数值和解析研究以及相应的重要应用．