甲酸钠对辐射损伤的抑制作用

目的：研究甲酸钠对辐射损伤的抑制作用。方法：采用溶血试验，受照小鼠肝、肾组织谷胱甘肽测定，受照质粒ＰＵＣ１９ＤＮＡ链断裂测定作为检测指标。结果：甲内能明显抑制紫外线致红细胞溶血作用；明显提高经＾６０Ｃｏγ射线照射的小鼠肝、肾组织谷胱甘肽水平；明显抑制经＾６０Ｃｏγ射线照射的南粒ＰＵＣ１９超螺旋构象百分率的下降。结论：甲酸钠能清除辐射引起民的自由基损伤，具有防辐射作用。     

牛磺酸与细胞膜自由基损伤的关系

为了探讨牛磺酸与细胞膜自由基损伤的关系，选用脂质过氧化物测定法、溶血试验及谷胱甘肽测定法的指标进行测定，结果显示：牛磺酸加剧了辐射导致的小鼠肝、脑、肾组织的脂质过氧化反应（Ｐ＜００５或Ｐ＜００１）；牛磺酸加剧了辐射导致的人红细胞悬液的溶血作用（Ｐ＜００１或Ｐ＜０００１）；牛磺酸与人红细胞悬液３７℃水浴１ｈ，发现牛磺酸致使红细胞中谷胱甘肽水平显著下降（Ｐ＜０００１）。结果提示，牛磺酸不是自由基清除剂，相反，它能加剧细胞膜的自由基损伤。     

叉鞭金藻多糖的分离纯化及体外抗氧化作用研究

叉鞭金藻多糖(DAP)经琼脂糖凝胶柱层析进行分级,得到了DAP-1和DAP-22个组分,分别对这2个组分进行了纯度和分子质量的测定,并考察了对羟自由基OH.、超氧阴离子O2-.的清除效果,以及对H2O2诱发小鼠红细胞氧化溶血的抑制作用和对小鼠肝匀浆脂质过氧化的抑制作用.结果显示,两个组份的组成相对均一,能显著或极显著清除OH.、O2-.,抑制小鼠红细胞溶血,并能显著抑制小鼠肝脂质过氧化的产生,且呈现剂量依赖性.其中DAP-2的抗氧化活性较DAP-1好,其对OH.、O2-.的清除率最高可达85.2%和76.0%,对小鼠红细胞的溶血抑制率和脂质过氧化的抑制率分别可达83.6%和89.3%.     

小麦液泡膜H^＋—ATPase的Ca^2＋激活特性

纯化小麦液泡膜Ｈ＾＋－ＡＴＰａｓｅ,测定了纯化的小麦液泡膜Ｈ＾＋－ＡＴＰａｓｅ受Ｍｇ＾２＋和Ｃａ＾２＋双重激活的特性及两种激活状态下酶的特性,Ｍｇ＾２＋激活时酶水解活性受ＤＣＣＤ的抑制,受旨酰丝氨酸（ＰＳ）影响明显,ＡＴＰ水解和泵质子活性相偶联,而在Ｃａ＾２＋激活时酶水解活性不受ＤＣＣＤ抑制,受ＰＳ影响微弱,Ｃａ＾２＋激活时ＡＴＰ水解与泵质子活性解偶联,Ｍｇ＾２＋和Ｃａ＾２＋对小麦液泡膜Ｈ＾＋－Ａ     

外源性DNA对小鼠自身DNA的保护作用

采用骨髓有核细胞微核率测定法，检测小鼠服用鲤鱼精巢ＤＮＡ后，６０Ｃｏ－γ射线对小鼠骨髓细胞染色体损伤的严重程度，结果表明，小鼠每天每千克体质量灌胃鲤鱼精巢ＤＮＡ１００ｍｇ，连续１５ｄ，可使总剂量６Ｇｙ的６０Ｃｏ－γ射线致小鼠骨髓有核细胞微核发生率减少４７．２％（Ｐ＜０．００１）；采用全血ＵＤＳ测定法，检测小鼠血细胞ＤＮＡ受紫外线损伤后的修复速度，结果表明，小鼠每天每千克体质量灌胃鲤鱼精巢ＤＮＡ３０ｍｇ，连续３个月，其全血ＵＤＳ增加４０．０２％（Ｐ＜０．００１）．     

连翘叶中苷类成分Ⅱ的体外抗氧化作用研究

研究连翘叶中苷类成分Ⅱ(FSGⅡ)的体外抗氧化作用。用水杨酸法研究FSGⅡ清除.OH的效果,连苯三酚自氧化法研究FSGⅡ清除O2.-的效果,硫代巴比妥酸法测定小鼠组织及肝线粒体、微粒体中丙二醛含量,分光光度法测定小鼠红细胞溶血和肝线粒体膨胀程度,研究FSGⅡ的抗氧化效果。结果表明FSGⅡ可以清除.OH和O2.-,抑制.OH所致丙二醛的产生,减少红细胞溶血,减轻肝线粒体的膨胀程度。FSGⅡ具有明显的体外抗氧化的作用。     

连翘叶中苷类成分Ⅰ的体外抗氧化作用研究

用水杨酸法研究FSGⅠ清除.OH的效果,连苯三酚自氧化法研究FSGⅠ清除O2.-的效果,硫代巴比妥酸法测定小鼠组织及肝线粒体、微粒体中丙二醛含量,分光光度法测定小鼠红细胞溶血和肝线粒体膨胀程度.结果表明,FSGⅠ可以清除.OH和O2.-,抑制.OH所致丙二醛的产生,减少红细胞溶血,减轻肝线粒体的膨胀程度.FSGⅠ具有明显的体外抗氧化的作用.     

藤茶多糖组分AGP-3的体外抗氧化活性研究

研究了藤茶多糖组分AGP-3的体外抗氧化活性.用K3[Fe(CN)6]模型测定多糖的还原能力,用试剂盒方法测定丙二醛(MDA)及活性氧(ROS)含量,用分光光度法测定小鼠红细胞溶血和小鼠肝线粒体肿胀度.结果表明,AGP-3在化学模拟体系具有一定的还原能力和清除活性氧能力,一定浓度范围内具有体外清除小鼠血清活性氧的作用,并能减少小鼠肝组织及肝线粒体MDA的生成,可抑制小鼠红细胞溶血和肝线粒体肿胀.     

鸭血糯黑桑椹抗氧化延缓衰老保健功效研究

以鸭血糯米提取液、黑桑椹水提取液给老龄ＢＡＬＢ／Ｃ小鼠灌胃,剂量分别为０．５,１．０,２．０ｍＬ。只＾－１．ｄ＾－１,每组２０只．４５ｄ后测定与抗氧化延缓衰老及美容有关的生化指标,结果表明：鸭血糯提取液、黑桑椹提取液都能使超氧化物歧化酶（ＳＯＤ）活笥显著增强（Ｐ〈０．０５或０．０１）,谷胱甘肽过氧化物酶（ＧＳＨ－Ｐｘ）和过氧化氢酶（ＣＡＴ）活性显著提高（Ｐ〈０．０１）,心肌脂褐素含量明显减少（Ｐ〉     

珍珠口服液的抗衰老功能评价

以１０月龄ＢＡＬＢ／Ｃ雄性小鼠为实验对象，研究珍珠口服液对衰老指标的影响，结果表明：与对照组相比，珍珠口服液使脑Ｂ型单胺氧化酶比活性下降１８９９％（Ｐ＜０００１）；红细胞谷胱甘肽过氧化物酶活性升高１８８３％（Ｐ＜０００１）；心肌脂褐素含量下降２４３３％（Ｐ＜００１），表明珍珠口服液具有一定的延缓衰老的作用。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

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.