Evolution and ecological correlates of uniparental reproduction in freshwater snails

We review the spatial and temporal correlates of uniparental reproduction in freshwater snails as they pertain to the ecological hypotheses for the maintenance of biparental sex. The biogeographic evidence from two species (Potamopyrgus antipodarum andBulinus truncatus) presently supports the Red Queen hypothesis that biparental reproduction is selected as a way to reduce the risk to progeny of parasite attack. Uniparental reproduction in these species is associated with low levels of infection by parasites (castrating digenetic trematodes), suggesting that parthenogenesis or self-fertilization can replace cross-fertilization when the risk of infection is low. In addition, inB. truncatus, the opportunity for cross-fertilization coincides with the season in which parasite attack is highest. In a third species (Campeloma decisum), parthenogenetic reproduction is correlated with latitude and the presence of a non-castrating trematode that may prevent cross-fertilization; these patterns suggest that parthenogenesis has been selected as a mechanism to assure reproduction. Finally, we discuss the spotty taxonomic distribution of parthenogenetic species.     

论弘扬"红军精神" --兼论发展先进文化

“红军精神”是川陕苏区历史留给我们的宝贵精神财富,是重要的苏区文化现象和自己时代精神的精华,是中国先进文化重要的生成因素,今天仍然是推动实践发展的强大精神动力,弘扬“红军精神”要与时俱进,弘扬“红军精神”就是发展先进文化,打造新世纪老区发展的精神文化竞争力。     

从月这意象解读《红楼梦》

本文以月之原型意象及衍生意象对《红楼梦》从内容上进行解构,认为《红楼梦》的主旨是为全人类的母亲唱一曲赞歌,为封建末世的不幸女性唱一曲颂歌和悲歌,表现了作者强烈的女性崇拜意识。有关小说内容的其他观点,都应在此之下,这是作者最主要的创作意图。又从月之运行规律对《红楼梦》的结构和情报进行了解构,认为小说仅写了月亮一月运行的四分之一周期,是用月亮的小循环推出社会和家族兴亡的大循环的,所以小说到八十回就是完整的,不存在所谓“遗稿”的“迷失”问题,高鹗续书恰恰是符合曹雪芹的愿意的。月之意象是解开《红楼梦》的一把钥匙,一个关键。     

Adsorption and catalytic combustion of ARB on CuO-Fe<Subscript>2</Subscript>O<Subscript>3</Subscript>

CuO-Fe2O3 composite material with strong magnetism and a large surface area is prepared by the co-precipitate method. Its adsorption properties towards Acid Red B (ARB) and the regeneration by catalytic combastion of organic compounds have been studied. The results show that the prepared CuO-Fe2O3 composite is an excellent adsorbent for ARB adsorption at acid condition. The presence of Cl^- has no effect on ARB adsorption. But the SO4^2- can inhibit ARB adsorption. After being recovered by the magnetic separation method, the adsorbent can be regenerated by catalytic oxidation of absorbate at 300℃ in air atmosphere. The combustion reactions of ARB in the presence or absence of CuO-Fe2O3 are studied by in situ diffuse refieclion FTIR. The results indicate that, in the presence of CuO-Fe2O3, the degradation temperature is significantly lowered by the catalysis of CuO-Fe2O3, and ARB can be oxidized completely without volatile organic compound by-product; in comparison, in the absence of CuO-Fe2O3, the temperature needed for oxidation of ARB is higher and the reaction is incomplete with some N-containing harmful compounds produced. The reusability of CuO-Fe2O3 is also studied in successive seven adsorption-regeneration cycles.     

双极性脉冲高压介质阻挡放电降解苋菜红

印染废水具有水量大、有机污染物质量浓度高等特点.利用双极性高压脉冲电源引发的介质阻挡放电产生的非平衡等离子体降解偶氮染料苋菜红(AR27),研究了影响色度去除的因素,如初始质量浓度、电导率、放电频率等,得到了较好的处理效果.结果表明:在初始质量浓度50 mg/L、电导率2.5×103μS/m、曝气量0.6 m3/h、频率50 Hz、电压18 kV时,放电处理90 min,脱色率可达到91%.     

论红色资源在推进社会主义核心价值体系培育中的应用

红色资源承载着中国化的马克思主义、革命传统精神和共产主义伦理道德,具有思想意识的引领、政治方向的引导、精神价值的传承、道德品德的教化等作用。在利用红色资源推进社会主义核心价值体系培育中,要科学开发三种载体的红色资源、搭建三个培育平台、拓展三种培育途径。     

高压处理前后饲料中维生素和氨基酸的变化

目的研究高压前后饲料中维生素和氨基酸的变化。方法应用氨基酸自动分析仪测定饲料中氨基酸的含量,采用高效液相色谱法测定饲料中维生素的含量。将饲料用132℃蒸汽高压处理8 min后测定其氨基酸与维生素含量,并与高压处理前比较。结果高压处理后,饲料中赖氨酸、蛋氨酸和精氨酸的含量显著下降,与高压处理前有显著差异(P0.01,P0.05)。高压处理后,饲料中维生素A(VitA)、维生素B族中的VitB1,VitB2,VitB6含量显著下降,与高压处理前有显著差异(P0.05)。结论高压处理后的饲料,无论是氨基酸还是维生素含量,均受到较大的影响。     

2,6-二羟基对苯二甲酸的合成及表征

以3,5-二羟基苯甲酸为原料,在常压、二氧化碳条件下,以Kolbe-Schmitt反应机理进行羧化制备2,6-二羟基对苯二甲酸,通过高效液相色谱、红外和核磁对产物结构和纯度进行了表征,发现产物结构正确,且纯度可达99.62%.实验结果表明,该工艺路线可行,产物纯度高,是一个简单可行的好方法.     

仕女瓷画与“红楼＂女子装饰

《红楼梦》是一部古典名著，随着它的出版，也出现了不少以此为题材的陶瓷作品。尤其红楼女子形象更是成为历代陶瓷艺术家们笔下不断的追求。这些仕女图纹装饰生动准确地反映了红楼女子形象的悲欢离合，一个个美妙绝伦的红楼仕女，一件件气韵鲜活的仕女瓷画，使《红楼梦》这部经典悲剧故事在陶瓷艺术世界中大放异彩、千古流传。     

A possible genetic component of obesity in childhood. Observations on acid phosphatase polymorphism

Summary Phenotypes of acid phosphatase with low enzymatic activity (ACP₁ A and BA) are correlated with the highest degree of body mass increase observed in a sample of obese children. Since acid phosphatase probably functions as a flavin-mononucleotide phosphatase, differential modulation of flavo-enzyme activity and energy metabolism due to acid phosphatase genetic variability may explain the observed association.