中度嗜热菌浸出黄铁矿过程中矿物表面硫的化学形态

利用扫描电镜(SEM)、X射线衍射(XRD)和硫的K边X射线吸收近边结构光谱(XANES)等分析手段研究了中度嗜热菌(Sulfobacillus thermosulfidooxidans)浸出黄铁矿过程及矿物表面硫的化学形态.结果表明:中度嗜热菌明显促进了黄铁矿的溶出,24 d浸出液中总铁的质量浓度达到5.3 g.L-1.经24 d细菌处理后,矿物表面形貌变化明显,出现良好结晶状态的晶体.浸出过程中累积在黄铁矿表面的主要成分是黄钾铁矾.矿物表面硫的形态组分主要为黄铁矿和黄钾铁矾,其质量分数分别为34.8%和65.2%.     

电性距离矢量预测有机污染物的生物富集因子

以电性距离矢量Mt表征165种非离子性有机物(NOC)的分子结构.利用多元回归方法建立了122种NOC的生物富集因子(lg BCF)与32个Mt的数学模型,其相关系数R为0.976.经逐步回归建立最佳四变量(M15,M17,M36,M91)模型,其R为0.960;并以Jackknife法检验,其LOO交互检验系数(q2)为0.915.这4个Mt参数揭示了影响NOC生物富集因子的主要因素,结果表明该模型具有良好的估算能力与鲁棒性.以111个NOC为训练集的生物富集模型作用于11个NOC的检验集,显示出良好的预测能力.     

Banach空间中有限族“三解合一”的混合临近点法

在一致凸一致光滑的Banach空间中引进了一个新的混合迭代序列,利用混合临近点法,找到了均衡问题与变分不等式及有限族半相对非扩张映射不动点问题的公共解(简称"三解合一"),并证明了该迭代序列强收敛到其公共解.所得结果改进和推广了已有的相应结果.     

Rapid growth and sterility of growth hormone gene transgenic triploid carp

Triploid carp (100%) with 150 (3n=150) chromosomes were obtained by crossing the females of improved tetraploid hybrids (♀, 4n=200) of red crucian carp (♀)×common carp (♂) with the males of diploid yellow river carp (♂, 2n=100). The crosses yielded transgenic triploid carp (positive triploid fish, 44.2% of the progeny) and non-transgenic triploid carp (negative triploid fish). Histological examination of the gonads of 24-month-old positive triploid fish suggested they were sterile and the fish were not able to produce mature gametes during the breeding season. Morphologically, both the positive and negative triploid fish were similar. They had a spindle-shaped, laterally compressed, steel grey body with two pairs of barbells. Most of the quantifiable traits of the triploid carp were intermediate between those of the two parents. The positive and negative triploid fish were raised in the same pond for 2 years. The mean body weight of the positive triploid fish was 2.3 times higher than the negative triploid fish. The weight of the largest positive triploid fish was 2.91 times higher than that of the largest negative triploid fish. Thus, we produced fast-growing transgenic triploid carp that have a reduced ecological risk because of their inability to mate and produce progeny.     

Exploring non-equilibrium statistical ensembles

Since Gibbs synthesized a general equilibrium statistical ensemble theory, generalizing the Gibbsian theory to non-equilibrium phenomena has been a dream for some theorists. However, the status of the theory for the non-equilibrium ensemble formalism is not as well established as the Gibbsian ensemble theory. In this work, we explore the formalism behind the non-equilibrium statistical ensemble theory based on the sub-dynamic kinetic equation originating from the Brussels-Austin school and develop...     

非小细胞肺癌外周血有核细胞miRNA表达特点研究

miRNA在非小细胞肺癌的发生发展中发挥重要作用,为了解非小细胞肺癌患者外周血有核细胞的miRNA表达特征及其作用,采用第二代高通量测序技术对7例非小细胞肺癌患者和7例对照的外周血有核细胞miRNA表达水平进行检测,比较非小细胞肺癌患者与对照的外周血有核细胞miRNA表达特征,分析两者miRNA表达水平差异情况,共鉴定出非小细胞肺癌患者与对照的外周血有核细胞中有显著表达差异的miRNA 209种,其中肺癌样本miRNA表达上调的有138种,表达下调的有71种.研究结果显示非小细胞肺癌患者与对照样本的外周血有核细胞中miRNA表达具有显著差异,其中部分已被证实参与肿瘤发生、发展等过程.     

大弹涂鱼松果体形态结构研究

鱼类松果体是传达外界信息到体内的主要传感器之一,其分泌的褪黑激素与鱼类生殖活动密切相关.为了阐明大弹涂鱼松果体形态结构与其功能的关系,运用组织细胞学方法研究了大弹涂鱼松果体的形态结构.结果表明,大弹涂鱼松果体位于端脑和中脑之间,由松果体柄和终囊两部分组成,具有背囊结构.松果体柄细长,细胞排列紧密,柄中有空腔,开口与第三脑室相通;松果体终囊膨大成梨形,且有空腔,腔内有皱褶,终囊顶部表面有黑色素细胞;背囊位于终囊下方,形状不规则,其囊壁向囊腔内反复折叠,形成许多复杂、盘旋曲折的内褶,背囊内部可见血细胞.研究结果为将来揭示大弹涂鱼半月周期产卵的机制提供了基础资料.     

原人参二醇和三醇的制备

将三七总皂苷与碱混合,在非溶剂的条件下,加热150℃进行常压碱解,再经硅柱层析纯化得到20(S)-原人参二醇(产率10%,纯度>90%)和20(S)-原人参三醇(产率18%,纯度>90%).     

非自治吊桥方程的一致吸引子

作者讨论了非自治吊桥面方程的长时间动力学行为.通过应用一些新的结果和能量估计技巧,获得了能量的一致衰退估计.当外力项f满足条件（C*）（而非平移紧）时,作者证明了一致吸引子在H20（Ω）×L2(Ω)上的存在性,此结果推广和改进了一些已有结果.     

FCC汽油非临氢脱硫技术研究进展

综述了国内外FCC汽油非临氢脱硫技术。详细介绍了生物脱硫、催化裂化脱硫、吸附脱硫、溶剂抽提脱硫、烷基化脱硫、氧化脱硫和膜分离脱硫等工艺,并评述了各种工艺的技术特点和研究应用前景。