浓缩生长因子治疗复发性口腔溃疡的疗效观察

目的：观察应用浓缩生长因子凝胶治疗复发性口腔溃疡,对患者疼痛消失的时间及愈合时间的影响。方法选择136例复发性口腔溃疡患者,随机分为实验组71例及对照组65例。实验组应用浓缩生长因子凝胶涂抹溃疡表面,3次/天;对照组用金因肽（重组人表皮生长因子）喷于溃疡表面,3次/天;比较两组溃疡愈合情况。结果疼痛消失的时间实验组3.25±0.32天,对照组4.61±0.54天,两组比较差异有统计学意义（P＜0.05）;溃疡愈合时间实验组5.15±0.74天,对照组6.81±0.78天,两组比较差异有统计学意义（ P＜0.05）。结论浓缩生长因子凝胶治疗复发性口腔溃疡可以缩短疼痛和愈合时间,具有应用价值。     

北京市外来人口聚集区:模式和发展趋势

外来人口聚居区的出现和发展,是城市化进程中的产物,它已成为北京外来人口生活居住的主要地区。2000年,北京市外来人口上万人的街道有102个,占到街道总数的30.4%,集中居住了74.4%的外来人口。外来人口高度聚集的情况短期内不会消失,并会随着北京的发展,形成数量更多、规模更大的聚集区。聚集区可以按照内部结构划分为缘聚型和混居型,依照行业依托情况分为完全依托、半依托和无依托。从动态角度来看,社会实行最低工资限额并能让向上流动成为可能,无依托型外来人口聚集区或许会继续保持一段时间的中转功能之后,转型或消失。完全依托型和半依托型聚集区问题则只能从产业结构调整、市场分布及配套方面入手解决。     

Understanding trends in concentrated poverty: 1980–2014

Trends in concentrated neighborhood poverty in the United States have been volatile over the past several decades. Using data from the 1980 to 2000 decennial census and the 2010–2014 American Community Survey, we examine the association between concentrated poverty across metropolitan areas in the United States and key proximate factors, including overall changes in poverty, racial residential segregation, and income segregation. One of our unique contributions is assessing the relative contribution of each of these to long-term trends in such poverty using a decomposition analysis. We find that changes in the segregation of the poor explained the largest share of the change in concentrated poverty over most of the time period, with the exception of the 1990s, where the plunge in both black and white poverty rates had the largest role in explaining the considerable decline in concentrated poverty in that decade for both groups. The association between racial segregation and black concentrated poverty is positive but weaker, indicating that without declines in black segregation, concentrated poverty would have been higher. Overall, growing income segregation, along with weak economic performance in recent years, have put more poor people at risk for living in high-poverty communities.     

浓缩饲料配方及其对鸡产蛋性能的影响

用不同配方浓缩饲料喂养产蛋鸡，研究其对产蛋性能和蛋白质的影响，结果表明：与对照组相比，各组产蛋鸡平均采食量、产蛋率、蛋重和料蛋比差异不显著（P＞0．05），料蛋比以Ⅱ组为最高，比对照组提高2．27％。     

发酵酒糟在蛋鸡饲养中应用的试验

对发酵酒糟在蛋鸡全价配合饲料中的应用进行了试验分析。结果表明:发酵酒糟较自然风干酒糟粗脂肪提高了298%,粗蛋白提高了39%,磷提高了384%。在基础日粮几乎不变的蛋鸡配合饲料中添加4%～8%发酵洒糟后,产蛋率提高9.2%～18.8%,料肉比降低0.35～0.53,综合经济效益提高81.6%～134.8%。发酵酒糟在蛋鸡配合料中的添加比例以6%～8%较好。