甲壳胺与蓖麻油组成的悬浮体系的电流变性能研究

制备了甲壳胺～蓖麻油电流变（ＥＲ）悬浮液,研究了外加电场强度（Ｅ）、剪切速率（γ）大小及体颗粒浓度（Ｃ）对甲壳胺～蓖麻油电流变液性能的影响。结果表明,随外加电场强度的增加,ＥＲ液的表观剪切应力增大;随剪切速率的提高,ＥＲ液的表现剪切应力反而减小,ＥＲ液中存在生产ＥＲ效应的临界颗粒浓度,只有当固体颗粒浓度高于临界值时,ＥＲ液的表观剪应力才有明显增大。     

灵丘县固城扬水工程管理站的发展对策

从灵丘县基本情况和固城灌区发展现状出发,明确了灌区发展方向,同时结合当前农业灌溉出现的问题,提出了未来灌区发展的对策。     

青岛城区土壤Hg元素环境地球化学研究

对青岛市的市南区、市北区、四方区、李沧区、崂山区进行了土壤地质调查.在1×1km2的取样密度下,取得表层土壤样品319个.用冷蒸气-原子荧光光谱法(CV-AFS)分析了所有样品中Hg的含量.重金属元素Hg的含量分布特征及其污染程度结果表明:Hg元素含量较高的地区集中在居民区、工业区、铁路公路等交通密集区,人为活动导致土壤中Hg元素含量的增加.     

Mortality of sea lions along the central California coast linked to a toxic diatom bloom

Over 400 California sea lions (Zalophus californianus) died and many others displayed signs of neurological dysfunction along the central California coast during May and June 1998. A bloom of Pseudo-nitzschia australis (diatom) was observed in the Monterey Bay region during the same period. This bloom was associated with production of domoic acid (DA), a neurotoxin that was also detected in planktivorous fish, including the northern anchovy (Engraulis mordax), and in sea lion body fluids. These and other concurrent observations demonstrate the trophic transfer of DA resulting in marine mammal mortality. In contrast to fish, blue mussels (Mytilus edulus) collected during the DA outbreak contained no DA or only trace amounts. Such findings reveal that monitoring of mussel toxicity alone does not necessarily provide adequate warning of DA entering the food web at levels sufficient to harm marine wildlife and perhaps humans.     

高氯酸镝、高氯酸铕在二苯亚砜体系中的共发光

合成了高氯酸镝铕（Ⅲ）二苯亚砜Ｄｙ１－ｘＥｕｘ（ＤＰＳＯ）η（ＤＰＳＯ）η（ＣｌＯ４）３（ｘ＝１．０００￣０．０００）一系列固体配合物,测定了配合物的组成及荧光激发和发射光谱、发现镝（Ⅲ）和铕（Ⅲ）的姚有猝灭作用,铕（Ⅲ）对镝（Ⅲ）的发光也有猝灭作用,同时研究了Ｄｙ＾３＋、Ｅｕ＾３＋相互猝灭的浓度范围,并根据实验结果了配体Ｓ１能级以及Ｄｙ＾３＋的有关能级     

Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes

When the core hydrogen is exhausted during stellar evolution, the central region of a star contracts and the outer envelope expands and cools, giving rise to a red giant. Convection takes place over much of the star's radius. Conservation of angular momentum requires that the cores of these stars rotate faster than their envelopes; indirect evidence supports this. Information about the angular-momentum distribution is inaccessible to direct observations, but it can be extracted from the effect of rotation on oscillation modes that probe the stellar interior. Here we report an increasing rotation rate from the surface of the star to the stellar core in the interiors of red giants, obtained using the rotational frequency splitting of recently detected 'mixed modes'. By comparison with theoretical stellar models, we conclude that the core must rotate at least ten times faster than the surface. This observational result confirms the theoretical prediction of a steep gradient in the rotation profile towards the deep stellar interior.     

S8联合小分子化合物Z18的抗肿瘤效应研究

 为了探讨S8联合小分子化合物Z18的抗肿瘤效应,本研究通过联合用药方式处理HeLa细胞后,采用台盼蓝染色和流式细胞仪对细胞死亡率和死亡方式进行检测。电镜实验证实Z18诱导细胞自噬,并利用Western Blotting检测联合用药后LC3-II的变化和使用转染了GFP-LC3或mRFP-EGFP-LC3的HeLa细胞检测联合用药对细胞自噬和自噬流的影响。最后通过ATG5 siRNA和CQ抑制自噬和自噬流,观察联合用药对细胞的自噬和死亡的变化,进一步研究S8对Z18的抗肿瘤作用的影响。结果显示,S8联合用药后,细胞死亡率显著升高(P<0.05),死亡方式主要以坏死为主。S8明显地促进了Z18对HeLa细胞的毒性,其促进作用具有剂量依赖性。但联合用药并未降低Z18引起的自噬空泡集聚,LC3-II蛋白表达也未发生变化。抑制自噬后,并未影响联合用药促进细胞死亡的结果。因此,Z18在联合使用S8的情况下,细胞自噬水平没有发生明显变化,而细胞死亡比例明显升高,自噬并不影响联合用药诱导的细胞死亡。S8可能通过调节细胞坏死的其他途径进而促进细胞对Z18的敏感性,并进一步使细胞发生坏死。     

HLA DQ位点多样性模拟分析及其PCR—RFLP分型

选择２７个识别序列为４ｎｔ的限制性内切酶,通过计算机对最新获得的１９个ＤＱＡ１和３５个ＤＱＢ１等位基因第２外显子中的一段序列进行模拟酶切分析,根据酶切格局数目及各格局所代表的等位基因数的均衡性,确定酶的优先次序,在此基础上进行ＰＣＲ－ＲＦＬＰ模拟分析,确定最佳的酶组合。结果表明,分别采用４个和６个酶的组合,可有效鉴定ＤＱＡ１和ＤＱＢ１等位基因。同时通过比较分析ＤＱＢ１各等位基因核苷酶位点的变异系数     

坚持民族区域自治保障民族平等权利

民族区域自治制度,是解决我国民族问题的基本政策,又是我国的基本政治制度。在我国,只有实行民族区域自治制度。才能保障民族平等权利。论述了民族平等的理论依据,民族区域自治对民族平等的保障作用。今后,为使少数民族全面享有平等权利,还必须充分行使国家赋予民族自治地方的自治权,重点发展经济,改善人民生活,使各民族共同繁荣。     

现代教育技术在数学教学中的应用

在教学无处不在的数字化时代里,计算机对数学的影响是巨大的,因此必须将现代教育技术引入数学教学中。