3种常见农药对泥螺、彩虹明樱蛤的急性毒性

开展了狂杀宝、乙酰甲胺磷、三唑磷等3种常见农药对泥螺和彩虹明樱蛤的急性毒性试验。结果表明:3种常见农药对泥螺、彩虹明樱蛤的急性毒性强度由大到小均依次为三唑磷、狂杀宝和乙酰甲胺磷,其中狂杀宝对彩虹明樱蛤、泥螺24 h,48 h,72 h,96 h的半致死浓度分别为3.412 mg/L,2.670 mg/L,2.469mg/L,2.168 mg/L和3.159 mg/L,2.527 mg/L,1.341mg/L,1.028 mg/L;乙酰甲胺磷对彩虹明樱蛤、泥螺24 h,48 h,72 h,96 h的半致死浓度分别为219.409 mg/L,202.143 mg/L,107.273 mg/L,88.559 mg/L和39.054 mg/L,35.590 mg/L,33.64 mg/L,26.539 mg/L;三唑磷对彩虹明樱蛤、泥螺24 h,48 h,72 h,96 h的半致死浓度分别为2.018 mg/L,1.185 mg/L,1.127 mg/L,1.049 mg/L和0.935 mg/L,0.876 mg/L,0.568 mg/L,0.368 mg/L。狂杀宝、乙酰甲胺磷、三唑磷对泥螺和彩虹明樱蛤的安全质量浓度分别为0.102 8 mg/L,2.653 9 mg/L,0.036 8 mg/L和0.2168 mg/L,8.855 9 mg/L,0.104 9 mg/L。最后,就泥螺和彩虹明樱蛤对狂杀宝、乙酰甲胺磷、三唑磷的急性致毒效应特征、药物间的致毒效果比较及其安全浓度进行了评价。     

彩虹明樱蛤贝体尺寸性状对体重的影响效应

随机选取彩虹明樱蛤120枚,在逐个测量体重和壳宽的基础上,以右壳为测量对象依次测量AB、AC、BC、OA、OB、OC和SW等长度性状指标.采用相关分析、通径分析和偏回归分析等多元统计学方法,探寻形态性状对体重的影响效应.结果表明:(1)除AC-BC组合未达极显著水平(P＞0.05)外,彩虹明樱蛤各生物学测定指标间两两相关系数均达极显著水平(P＜0.01);(2)AB、OB、SW等3项尺寸性状是影响彩虹明樱蛤体重的关键指标,其中AB尤为重要,其它尺寸性状主要通过AB的间接作用影响体重;(3)AB-SW、AB-OB、SW-OB性状组合对体重的决定程度较大,其中SW-OB组合在AB的影响下大于AB对体重的直接影响.     

4种重金属对泥螺的急性毒性和联合毒性研究

2006年7～8月以泥螺养殖壳高优势组(平均壳高为6.78±0.78 mm)为实验动物,开展了Hg2 、Cr6 、Cu2 、Zn2 对泥螺的急性毒性和加和等毒性强度联合毒性试验。结果表明:泥螺对重金属的耐药性均随实验时间延长而缓慢降低,4种重金属离子毒性大小依次为Cu2、Hg2 、Zn2 、Cr6 ,其对泥螺96 h的半致死质量浓度分别为0.0011 mg/L、0.630 mg/L、1.94 mg/L和9.44 mg/L。Hg2 、Cr6 、Cu2 、Zn2 离子两两组合在加和等毒性强度下对泥螺96 h联合急性毒性所呈现的致毒特征与离子间毒性强度匹配情形密切相关。并据此就Hg2 、Cr6 、Cu2 、Zn2 对泥螺的急性致毒效应特征,泥螺对Hg2 、Cr6 、Cu2 、Zn2 的安全浓度以及重金属离子间联合毒性效应进行了分析与探讨。     

溴代海因水溶液制剂及杀菌效果研究

研究了助溶剂量和温度对溴代海因溶解性的影响;考察了溴代海因水溶液制剂的稳定性;实验研究了助溶剂浓度、作用时间和温度对溴代海因水溶液制剂的杀灭效果。结果表明：加入助溶剂的溴代海因在水中的溶解性明显增强,当加入5％（体积分数）的助溶剂时,水溶液中二溴海因的浓度是无助溶剂时的2．32倍,溴氯海因的质量浓度是无助溶剂时的1．99倍;溴氯海因水溶液制剂中有效成分含量随存放时间的延长有所下降,二溴海因水溶液制剂中有效成分含量随存放时间的变化不明显,比溴氯海因具有更好的稳定性;添加少量助溶剂可明显改善溴代海因的杀菌能力,含0．1％助溶剂的溴氯海因（3mg／L）水溶液制剂对大肠杆菌的杀灭率为99．91％（无助溶剂时的杀灭率为96．48％）,含0．1％助溶剂的二溴海因（290mg/L）水溶液制剂对枯草杆菌黑色变种芽孢的杀灭率为100.00％,而无助溶剂的二溴海因（474mg/L）水溶液制剂的杀灭率为97．09％。     

彩虹明樱蛤Moerella iridescens浮游幼虫饵料与生长的初步研究

本文报导了彩虹明樱蛤浮游幼虫饵料与生长的关系,研究分析了不同饵料种类对浮游幼虫生存、生长的影响,同时对投饵量作了比较试验,实验结果得出:x藻、等鞭金藻适宜于作为面盘浮游幼虫的饵料,投饵量以5万/ml左右为宜,至幼虫达到壳顶期后,应投喂扁藻及塔胞藻,投量为1—2万/ml。此外,本文还就投饵时机进行了讨论。     

六种药物对唇鱼骨鱼苗的急性毒性试验

探讨了溴氯海因、硫酸锌、清苔净粉、二氧化氯、PVP粉、强氯精对瓯江唇鱼骨鱼苗的急性毒性,并求出六种药物相应的安全浓度.结果显示,溴氯海因、硫酸锌、清苔净粉、二氧化氯、PVP粉、强氯精对瓯江唇鱼骨鱼苗48 h的半致死浓度分别为:2.836,7.058,4.672,2.329,9.182,0.239 mg/L;安全浓度分别为:0.023,0.110,0.096,0.016,0.228,0.015 mg/L;急性毒性由强至弱依次为:强氯精,二氧化氯,溴氯海因,清苔净粉,硫酸锌,PVP粉.并就六种药物对唇鱼骨的急性致毒效应特征进行分析和探讨.     

强氯精和溴氯海因对草鱼鱼苗的急性毒性研究

本研究用强氯精、溴氯海因两种常用水产药物,对草鱼鱼苗的进行急性毒性实验。结果表明:强氯精和溴氯海因对草鱼鱼苗的安全浓度分别为:0.4436 m g.L-1,4.6763 m g.L-1。草鱼鱼苗对强氯精和溴氯海因的敏感性为:强氯精>溴氯海因。     

六种药物对唇hua鱼苗的急性毒性试验

探讨了溴氯海因、硫酸锌、清苔净粉、二氧化氯、PVP粉、强氯精对瓯江唇hua鱼苗的急性毒性,并求出六种药物相应的安全浓度。结果显示,溴氯海因、硫酸锌、清苔净粉、二氧化氯、PVP粉、强氯精对瓯江唇hua鱼苗48h的半致死浓度分别为：2．836,7．058,4．672,2．329,9．182,0．239mg／L;安全浓度分别为：0．023,0．110,0．096,0．016,0．228,0．015mg／L;急性毒性由强至弱依次为：强氯精,二氧化氯,溴氯海因,清苔净粉,硫酸锌,PVP粉。并就六种药物对唇hua的急性致毒效应特征进行分析和探讨。     

溴氯海因对鱼类的急性毒性试验及治疗效果

溴氯海因浓度为0.3×10-6,0.6×10-6和1.5×10-6时,4种试验鱼(草鱼(C tenopharyngodon idellus),白鲢(Hypophthalm ichthys m olitrix),日本鳗(Anguilla japonicus),红剑尾鱼(Xiphophorus helleri))是安全的;浓度为2×10-6时,前2种试验鱼全部存活,而日本鳗和红剑尾鱼的死亡率为7.5%和15%.并测定了该药对嗜水气单胞菌嗜水亚种(Aerom onas hydrophila hydrophila)、荧光假单胞菌(Pseudom onas fluorescens)、鲁氏不动杆菌(Acinetobacter lwoffi)及迟钝爱德华氏菌(Edwardsiella tarda)4种菌的最小抑菌浓度,分别为0.312 5μg.mL-1、0.156 0μg.mL-1、0.156 0μg.mL-1、0.312 5μg.mL-1.用浓度为0.6×10-6,0.3×10-6和0.15×10-6的溴氯海因预防和治疗白鲢细菌性出血病和患爱德华氏菌病的日本鳗,均取得一定的防治效果.     

水中二溴海因在紫外辐照下的分解和副产物的形成机理

研究1,3-二溴-5,5-二甲基海因(DBDMH)水溶液中的有效溴、溴离子和溴酸根离子在紫外(UV)辐照下的转化过程,并探讨pH、光照波长和氨氮等因素对次溴酸溶液的光促歧化反应的影响.研究结果表明:普通消毒剂量的DBDMH水溶液(质量浓度为3.2 mg/L)紫外辐照5 min后可产生质量浓度较大的溴酸根离子(>25.9 μg/L);溴酸根离子是次溴酸光促歧化反应的中间产物;在实验条件下,紫外光波长越短,越有利于有效溴的光解和溴酸根的 生成,而pH的影响较小;氨氮通过与有效溴反应形成溴氨抑制溴酸根离子的生成.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.