铜、铅、镉在真鲷幼鱼组织的积累与分布

福建省自然科学基金项目!C95003

DISTRIBUTION FEATURES AND SOURCES of Cu, Pb, Zn AND Cd IN XIAMEN WESTERN SEA SEDIMENTS

1994年10月调查研究了厦门西海域表层沉积物样品中Cu,Pb,zn,Cd在不同粒度颗粒中不同结合态的含量.结果表明,该海域表层沉积物中Cu,PH,zn,Cd在弱结合态中有一较稳定的分配比;Cu,Pb,zn,Cd的平均浓度分别为30.2,77.2,144.2,0.7Mg/kg;根据底质评价标准,zn,Pb严重超标.采用底质中某污染物的混合模式估算出该海域沉积物中Cu,PH,zn,Cb在天然风化部分的平均含量分别为21.1,46.8,104.3,0.46Mg/kg;Cu,Pb,zn,Cd人为增量平均占总量的30%左右.相关分析的结果表明,该海域表层沉积物中Cu,zn的行为紧密相关且可能与生物活动有关、总含量平面分布的结果表明九龙江径流对该海域Pb,Cd有较大的输入作用,但是Cu,zn却主要来自市区排污.The contents of Cu, Pb, Zn and Cd in diFFerent size Fraction of sediments and in various Forms were investigated in Xiamen Western Sea during October, 1994.The mean concentrations of Cu, Pb, Zn, Cd are 30.7, 77.2, 144.2, 0.7mg/kg, respectively, with that of Zn and Pb exceeding the unpolluted sediment background value.It is indicated that there is relatively stable distribution ratio between leachable Forms and reFratory Forms of metals in the area, about 8%-16% For Cu, Pb, Zn and 16%-34% For Cd in leachable Forms.A Sediment Pollutant Mixing Model is applied to estimate the natural background concentration of heavy metals in Xiamen Western Sea, and that of Cu, Pb, Zn, and Cd are determined to be 21.0, 46.8, 104.3, 0.46mg/kg respectively.The anthropogenic input of Cu, Pb, Zn, Cd are about 30% of the total concentration.The signiFicant correlations between Zn and Cu and of the two with organic matters in the area suggested similar sources of Zn, Cu and the inFluence of biological activities.The study also indicate that the Jiulong River runofF is relatively important For Pb and Cd input in Xiamen Western Sea sediments, while Cu and Zn are mostly input From the urban pollution.国家自然科学基金资助项目(49356001

Are Analysts Inclined to Follow Up Corporations with Good Social Responsibility Performance?

本文以2008年-2010年沪深上市公司为样本,运用短面板数据以及个体和时间双向固定效应模型,实证检验了分析师跟进与企业社会责任表现之间的关系。研究发现(1)企业社会责任表现对分析师跟进程度具有正向影响,且这种影响具有滞后性;(2)高公司治理水平能够增强社会责任表现对分析师跟进程度的正向影响。研究结果为推动企业积极履行社会责任、优化公司治理结构和引入社会责任报告第三方鉴证指引了方向。Using a sample of listed companies in SSE and SZSE for the period 2008-2010, this paper introduces short panel data and two-way fixed effects model to test the relationship between analyst follow-up and the performance of corporate social responsibility(CSR).We find that CSR performance has a positive impact on analyst follow-up, however such impact is a little lagged.We also find that high level of corporate gov-ernance can enhance the positive relationship between analyst follow-up and CSR performance.The results indicate that corporations should fulfill their social responsibilities, optimize the corporate governance structure and introduce the independent third parties to attest the social responsibili-ty reports.国家自然科学基金项目“全球金融风暴背景下中国企业财务决策行为研究”(批准号70972110)的资

4种红景天植物的组织培养研究

以大花红景天、云南红景天、长鞭红景天和库页红景天的茎和叶为外植体进行组织培养,结果表明:大花红景天以茎为外植体诱导芽效果最好,其它3种红景天以叶为外植体诱导芽效果最好.云南红景天和长鞭红景天适合的芽诱导激素组合是0.1 mg/L NAA和2.5 mg/L 6-BA的组合,在该激素水平下两种红景天的出芽频率分别达到71%和84%;大花红景天和库叶红景天适合的芽诱导激素组合是0.5 mg/L NAA和2.5 mg/L 6-BA的组合,在该激素水平下两种红景天的出芽频率均达到80%.长鞭红景天和库叶红景天在添加IBA的培养基上容易生根形成完整植株,生根率分别达到87%和73%;经过炼苗后,长鞭红景天再生苗能够成功移栽,成活率达66%

4种红景天植物的组织培养研究

以大花红景天、云南红景天、长鞭红景天和库页红景天的茎和叶为外植体进行组织培养,结果表明:大花红景天以茎为外植体诱导芽效果最好,其它3种红景天以叶为外植体诱导芽效果最好.云南红景天和长鞭红景天适合的芽诱导激素组合是0.1 mg/L NAA和2.5 mg/L 6-BA的组合,在该激素水平下两种红景天的出芽频率分别达到71%和84%;大花红景天和库叶红景天适合的芽诱导激素组合是0.5 mg/L NAA和2.5 mg/L 6-BA的组合,在该激素水平下两种红景天的出芽频率均达到80%.长鞭红景天和库叶红景天在添加IBA的培养基上容易生根形成完整植株,生根率分别达到87%和73%;经过炼苗后,长鞭红景天再生苗能够成功移栽,成活率达66%

Acute toxicity test of zinc and lead to Ruditapes philippinarum

本文研究了必需元素zn及非必需元素PH对菲律宾蛤仔（rudITAPESPHIlIPPInAruM）的急性毒性作用，得到zn对其的48Hld50和96Hld50分别为147.91、16.40Mg/M3；PH对其的48Hld50和96Hld50分别为31.62、14.28Mg/dM3。估算得到zn、PH对菲律宾蛤仔的安全浓度分别为082、0.71Mg/dM3。Acute toxicity of zinc and lead to Ruditapes philippinarum was studied.Toxicity of Zn2+ and Pb2+ was evaluated in 48 h and 96 h bioassays.The 48 h LD50 values were 147.91 mg/dm3 For Zn2+ and 31.62 mg/dm3 For Pb2+ ; the 96 h LD50, values were 16.40 mg/dm3 For Zn2+ and 14.28 mg/dm3 For Pb2+.Thg saFe concentration of Zn2+ and Pb2+ For Ruditapes philippinarum was also estimated, to be 0.82 mi/dm3 and 0.71mg/dm3 respectively

ACCUMULATION AND TOXICITY of MIXTURE of LEAD AND ZINC IN CLAM RUDITAPES PHILIPPINARUM A.

研究了铅、锌对菲律宾蛤仔的急性毒性，以及铅、锌混合液在菲律宾蛤仔体内的积累和对过氧化氢酶酶活性的影响.结果表明：铅的毒性略大于锌的毒性（96HlC50值分别为14.28，16.40Mg/l）：铅、锌混合液对蛤仔体内的重金属吸收存在交互作用，高浓度的锌（6Mg/l）明显地抑制蛤仔对高浓度铅的吸收；铅和锌的浓度为（3Mg/l）时对蛤仔的重金属吸收均有促进作用；高浓度的铅和锌混合液对蛤仔过氧化酶活性亦有显著的交互作用.呈拮抗效应.Accumulation of mixture of lead and zinc and their toxic effect on the activities of Catalase (CAT)in clam following various exposure concentration were studied in laboratory.The 96h LC50 values of lead andzinc for clam were 14.28 mg/L.16.40mg/L, respectively.the toxicities of two kinds of metals were in sequence of Ph＞Zn.Lead and zinc bioaccumulated in the study showed that different organ has different capacities for accumulating metal.with high levels in the gill.followed by soft body.and comparative lesseramounts in the fluid of cavity.The ratio of accumulation of lead in gill and soft body was far larger than thatof zinc.The clam was strong accumulator of lead.while was weak accumulator of zinc.The L9 (34)factortests showed a significant interaction between Zn and Ph on the activities of CAT in clam.indicated the antagonistic effect of Ph and Zn of CAT activities

Metal-accumulation of Ruditapes philippinarum in high zinc and lead experimental waters

双壳类软体动物菲律宾蛤仔（rudITAPESPHIlIPPInAruM）在高浓度zn、PH（1~9Mg/dM3）实验水体中短期（96H）暂养。测定了菲律宾蛤仔鳃和软体部（除鳃以外的软体部，下同）的zn、Pb含量。单项金属积累实验结果表明，菲律宾蛤仔鳃和软体部zn、Pb含量随实验水体中zn、Pb离于浓度的增加而增加。但鳃对zn、Pb的积累量总是较软体部高。这与两种器官的生理特性相一致。组是呼吸器官，与水体接触最为频繁，血液流经量大；软体部会内脏和肌肉等，血液流经量大于鳃。两种金属混合实验表明，水作中zn、Pb迭加浓度接近菲律宾蛤仔的半致死浓度时，菲律宾蛤仔鳃和软体部会抑制对zn、Pb的积累，甚至排出zn、Pb。这表明菲律宾蛤仔鳃和软体部有主动积累和排出zn、Pb的功能；另一方面，zn、Pb也存在着相互抑制的作用。Ruditapes philippinarum (Bivalvia) was exposured at high zinc and lead level (1--9mg/dm3).The contents of Zn and Pb at gill and soft parts were determined.One metal experimental results showed that the higher level zinc and lead at experimental waters, themore zinc and lead were accumulated by R.philippinarum.Gill was always higher accumulation than soft parts.This phenomenon is accord with their physiological characteristics.Gillis a respiratory organ and always expoces and more blood passes gill than soft parts.Experiment For two metals showed gill and soft parts of R.philtheinarum would limit the accumulation when zinc and lead level approaches its 96h LD50 values,showing that gill and soft partsof R.philippinarum have Functions to accumulate and exclude zinc and lead actively.Zinc andlead show limiting interactions when they are at high levels.国家自然科学基金!4935600

一种等臂长外差式激光干涉测距系统

本发明提供了一种等臂长外差式激光干涉测距系统，至少包括：隔振系统，用于将外界的低频率噪声进行隔离与过滤，消除系统的震动噪声；真空系统，用于降低系统因温度波动所带来的热噪声；光源系统，用于提供2束高稳定性、高稳频的激光，同时这两束光具备相应的差分频率；干涉系统，用于产生两路等臂长外差式干涉信号，利用位移与相位之间的关系，得到被测两物体之间的位移变化信息；相位监测与数据分析系统，用于对干涉信号进行相位检测，对相位信息进行采集，并反演位移，反映干涉系统在各个频段上的测距精度。本发明可消除激光器频率不稳定性、各类噪声源对测距精度的影响，实现了长周期皮米量级的测量精度