浅析木球运动损伤及防护措施

木球是民族传统体育运动项目,比赛时创伤率高.我们对运动员可能造成的损伤进行研究,并给出相应的防护措施,旨在使广大木球爱好者可以更好地参与这项运动,同时间接地推动木球运动的良性发展.     

棕色田鼠精母细胞中联会复合体的研究

以表面铺展法制备棕色田鼠精母细胞联会复合体标本，经硝酸银染色作电镜观察．结果表明，在减数分裂前期 Ｉ Ｘ 和 Ｙ 染色体的形态和行为同常染色体有明显差异； Ｘ Ｙ 染色体的配对起始于早粗线期，成熟于中粗线期，在晚粗线期先于常染色体解联会； Ｘ 染色体未配对区域自身折叠，形成发夹状结构     

Midzone activation of aurora B in anaphase produces an intracellular phosphorylation gradient

Proper partitioning of the contents of a cell between two daughters requires integration of spatial and temporal cues. The anaphase array of microtubules that self-organize at the spindle midzone contributes to positioning the cell-division plane midway between the segregating chromosomes. How this signalling occurs over length scales of micrometres, from the midzone to the cell cortex, is not known. Here we examine the anaphase dynamics of protein phosphorylation by aurora B kinase, a key mitotic regulator, using fluorescence resonance energy transfer (FRET)-based sensors in living HeLa cells and immunofluorescence of native aurora B substrates. Quantitative analysis of phosphorylation dynamics, using chromosome- and centromere-targeted sensors, reveals that changes are due primarily to position along the division axis rather than time. These dynamics result in the formation of a spatial phosphorylation gradient early in anaphase that is centred at the spindle midzone. This gradient depends on aurora B targeting to a subpopulation of microtubules that activate it. Aurora kinase activity organizes the targeted microtubules to generate a structure-based feedback loop. We propose that feedback between aurora B kinase activation and midzone microtubules generates a gradient of post-translational marks that provides spatial information for events in anaphase and cytokinesis.     

激光对小鼠精母细胞联会复合体影响的研究

以亚离子和He-Ne激光照射活体雄性小鼠睾丸，观察小鼠睾丸中精母细胞的联会复合体。发现小鼠精母细胞的联会复合体发生一定程度的畸变，说明激光辐射不仅可造成哺乳动物表面组织热损伤，还有可能诱发染色体变异，这对今后激光在遗传育种方面的进一步开发应用有重要意义。     

煤焦化过程中铅的分布规律研究

通过对某焦化厂所用煤样及生产出的焦炭、焦油和氨水中铅(Pb)含量分析,研究铅在焦化产物中的浓度分布,结合煤焦化模拟实验,获得炼焦过程中Pb在固相(焦炭)、液相(焦油和氨水)和气相产物中的分布规律.结果表明, 65%(质量分数,下同)的Pb残存在焦炭中,7%的Pb转化到氨水里,焦油中的Pb含量占总量的4%,24%的Pb转化到煤气中.     

采动过程中覆岩破碎区碎胀性走向分布特征

为了探究采动过程中覆岩破碎区碎胀性在走向分布规律,采用UDEC数值模拟及相似模拟手段分析了煤层顶板运移规律及碎胀系数分布特征。结果表明：随着采空区上覆岩层空间结构发展的演化,煤层顶板下沉量由下至上逐层降低,并最终趋于稳定;在工作面推进方向上,碎胀系数不断降低,且呈现出一定的分区特性,随回采呈现动态变化的周期性前移,其在走向上划分为三个区域,即：自然堆积区、载荷影响区、逐渐压实区。最后,确定浆体充填滞后距离为60m,现场试验邻位注浆充填效果良好。