Cbfa1基因结构与功能分析

核结合因子α1（cbfa1）是runt结构域基因家族的重要成员之一,编码一个成骨细胞特异性转录因子,调控成骨细胞发育、分化和骨的形成。cbfa1基因含8个外显子,但它的多个外显子存在选择性剪接,产生多样cbfal的异构体,具有不同的转录激活潜能。多条信号传导通路参与到cbfal的活性或表达的调控。本文主要从cbfa1基因的结构、功能、表达调控以及基因功能的影响因子等方面进行了综述。     

Urban park pathway design characteristics and senior walking behavior

Urban parks are easily available settings for seniors to engage in daily physical activity. As a type of low-cost physical activity, walking can bring seniors multiple health benefits. Among all park facilities, park pathways are most significantly related to physical activity. The present study examined the links between specific park pathway design characteristics and senior walking within urban park, through observations and interviews. This study was conducted in two neighborhood parks in Beijing, China. On-site observations were utilized to collect data on senior walking behavior (dependent variable) and pathway design characteristics (independent variable). We calculated the average number of observed seniors in all observations to represent usage of each pathway segment. Interviews were conducted to explore pathway design characteristics preferred and disliked by senior users. ANOVA analyses and correlation analyses revealed that seniors prefer pathways that have soft or even pavement (plastic track and bricks), benches, flowers, and light fixtures. Also, seniors are attracted to pathways that are long, between 3–3.9 meters wide, and without connection with activity zones. In addition, results suggest other pathway design characteristics, such as being along a water body, having shade, providing lateral visibility and visual connection with water, and without visual connection with landmarks may also encourage senior walking. By providing park pathways preferred by seniors, designers can create park environments that are supportive of senior walking, and ultimately contribute to improving senior health and life quality.     

中部地区土地监管现状分析及完善路径——以安徽省为例

介绍了现有的土地监管体系以及安徽省土地监管现状,着重分析了“十二五”期间安徽省土地监管面临的新形势和挑战.针对土地监管面临的新需求,从完善管理体制、加大执法力度、加强重点区域和项目督查、拓宽信息渠道4个方面提出相应的对策与建议.     

几种土壤生物因子对土壤养分的影响

试验研究了在果树—牧草间作模式下土壤中纤维分解菌、硅酸盐细菌以及蔗糖酶、脲酶、过氧化氢酶、纤维分解酶、多酚氧化酶对土壤中N、P、K全量养分、速效养分和有机质的影响,并通过通径分析发现:脲酶、硅酸盐细菌、纤维分解酶是促进有机质积累的主要生物因素,蔗糖酶是影响N、P、K速效养分的最主要因子,过氧化氢酶、多酚氧化酶、纤维分解菌只是选择性地对有机质的积存和N、P、K速效养分的形成起作用。     

基于文化生态平衡的乡村旅游发展路径探析

介绍了基于文化生态平衡的乡村旅游现状,提出了相应的发展路径。     

气候暖干化背景下渭南市农业节水途径与模式研究

以陕西省渭南市为研究区,基于渭南市1960~2011年的气象数据,分析了渭南市气候暖干化特征和暖干化背景下渭南市农业水资源利用现状,探索了渭南市农业节水途径及节水模式。研究表明,渭南市应主要通过工程节水、技术节水和管理节水等途径,采用因"地"制宜模式、因"时"利导模式、量"水"而行模式和得"补"偿失模式,来实现渭南市农业水资源可持续利用。     

台风“鲇鱼”环流的风矢量结构变化对其路径突变的影响

[目的]研究1013号强台风＂鲇鱼＂的风矢量结构变化及其对台风路径突变的影响。[方法]根据台风涡旋非对称结构对台风运动产生影响理论,对以1013号超强台风＂鲇鱼＂中心为坐标原点,300～500 km内850、500 hPa切向旋转速度分解成u、v分量,分析台风的合力运动倾向,探讨1013号强台风＂鲇鱼＂的风矢量结构变化及其对台风路径突变的影响。[结果]1013号强台风在快速移动阶段时,风矢量存在明显不对称结构;而在原地打转时,风矢量呈对称结构;当ΔU、ΔV及合成风矢出现明显的变化时,表明台风的合力出现变化,台风移动方向将出现突变。500和850 hPa台风中心周围300～500 km附近风速的不对称结构也有利于移动路径的趋向性;ΔU、ΔV及合成风矢,其指向可以作为台风合力运动的方向。[结论]该研究为台风的预防提供参考依据。     

农民专业合作社融资路径研究

在分析农民专业合作社融资问题的基础上,提出改革农民专业合作社的制度设计、实现农民专业合作社股份的流动,以稳定内源融资;鼓励农民专业合作社参股农村信用社或建立农村合作金融组织,完善担保体系和农业保险体系,以利于外源融资;政府应为农民专业合作社融资营造良好的政策环境。     

实现河南烟叶生产可持续发展的主要途径

结合河南省实际,从烟叶资源配置、技术研发和推广、生态环境保护、生产组织方式、保障机制及优质烟叶基地建设等方面系统阐述了实现河南烟叶生产可持续发展的主要途径。