利用间歇浸没式生物反应器进行果蔗组培快繁

以果蔗(Badila)茎尖脱毒组培苗为材料,利用间歇浸没式生物反应器(Temporary immersion bioreactors TIBs)进行组培快繁的技术体系的研究。结果表明:(1)使用TIBs系统进行甘蔗组织培养一代增殖较传统方法高出10倍以上;(2)TIBs系统以第4代继代材料为宜;(3)接种密度在10～15株/L培养基最有利于甘蔗组培苗的增殖和生长;(4)TIBs系统中6-BA浓度为0.5～1.0mg/L时适合于增殖培养,NAA浓度为4mg/L时有利于根的诱导;(5)浸没间歇频率在1min/3h时增殖和生长表现较为优异,1min/6h时有利于根的诱导和根的生长。     

浅析临时绿地绿化建设项目在西宁地区城区绿化中的可行性

介绍了临时绿地建设的概念,西宁市建成区实施临时绿地建设的重要意义。通过阐述西宁市临时绿地建设项目中采取的设计理念与技术措施及开展临时绿地建设项目后取得的成绩,提出了临时绿地建设项目在西宁地区建成区绿化中可行性。     

临时性水土保持技术应用于农作物保护的探讨

公路工程建设的不断增多导致公路周边的水土流失问题严重,并将影响到公路旁的农作物生长.针对水土流失这一问题,提出全新的工程措施进行防治,从而达到保护水土,防止农作物被破坏的目的.     

甘蓝型油菜隐性核不育系ZWAB的选育及其临时保持系和恢复系的筛选

利用甘蓝型油菜隐性核不育杂交组合川油14中发现的不育株作母本、引进英国品种Bristal作父本杂交,F1代与中油821进行复合杂交,于后代中连续选择不育株与可育株兄妹交,获得稳定的两型系ZWAB.通过对其广泛测交,筛选出能完全保持其不育性的临时保持系和完全恢复的恢复系.临保不育系和恢复系配制的杂交种具有较强的杂种优势,有着良好的利用前景.     

迁安县治山改沙生态效益分析

研究和分析了半山半沙地区建设生态农业、实施工程措施和生物措施取得的成效，阐明了山区修建“围山转”水平沟和沙区营造速生丰产林、护岸林及农田防护林等配套生态工程建设是治山改沙的有效途径，可充分利用自然资源，改善生态环境，生态、经济和社会效益显著。     

科技人员基层挂职是科技创新和科技成果转化的有效途径

科技人员基层挂职是科技创新和科技成果转化的有效途径,对发展现代农业和社会主义新农村建设有着积极的现实意义,文章就基层挂职实施提出了可行的政策建议。     

Temporary conservation for urban biodiversity

Urban habitats, particularly wastelands and brownfields, maintain rich biodiversity and offer habitat for many species, even rare and endangered taxa. However, such habitats are also under socio-economic pressures due to redevelopment for housing and industrial uses. In order to maintain urban biodiversity, it is currently unknown how much open area must be preserved and whether conservation is possible without complete exclusion from economic development. In this study, we applied a simulation model based on species distribution models for plants, grasshoppers, and leafhoppers to investigate planning options for urban conservation with special focus on business areas. Altogether, we modelled the occurrence of 81 species of the urban species pool and analysed settings of different proportions of open sites, different habitat turnover times, and different lot sizes. Our simulations demonstrated that dynamic land use supports urban biodiversity in terms of species richness and rarity. Setting aside brownfields before redevelopment for a period of on average 15 years supported the highest conservation value. Consequently, we recommend integrating the concept of ‘temporary conservation’ into urban planning for industrial and business areas. This concept requires habitat to be destroyed by redeveloping brownfield sites to built-up sites, but simultaneously creating new open spaces due to abandonment of urban land uses at other locations. This maintains a spatio-temporal mosaic of different successional stages ranging from pioneer to pre-forest communities.     

Use of transesophageal atrial pacing to provide temporary chronotropic support in a dog undergoing permanent pacemaker implantation

A 14.5-kg, 13-year-old female spayed Cocker spaniel was evaluated because of episodic hind limb weakness. Results of examination were consistent with sick sinus syndrome with intermittent second-degree atrioventricular block. Transesophageal atrial pacing was successful in providing chronotropic support during permanent pacemaker implantation. Transesophageal atrial pacing appears to be a viable option for temporary atrial pacing in dogs with hemodynamically marked bradycardia without significant atrioventricular blockade.     

How one tree can change the future of a neighbourhood: The process behind the creation of the Boerenhof Park as an example for tactical urban planning

In this paper, the process behind the making of the Boerenhof Park on an urban Waiting Space in Ghent (Belgium) is discussed. We are highlighting how in this case ‘tactical urbanism’ actions, such as planting a tree, turned out to have a long-term impact and as such can inform a ‘tactical urban planning’ approach. Through a learning by reflection method, the Boerenhof Park case has been re-analysed using a conceptual framework built up around the concepts of ‘scratch’, ‘scar’ and ‘score’. The focus was on discerning the transgressional elements for moving from short-term interventions to long-term change. Three key aspects are brought to light: the incremental approach, a desire-driven program, and a transversal collaboration. We argue that these are key aspects for the operationalisation of a tactical urban planning approach.     

民初资产阶级新闻法思想评介——以《暂行报律》事件为视角

《暂行报律》事件是民国初年新闻界发生的抵制国家新闻法制化管理的代表性事件,它不仅反映了当时资产阶级各派别之间政治诉求的差异,也反映了民初资产阶级的新闻法思想。在这场事件中,以章太炎和孙中山为代表的两派主要在新闻自由与法制方面有较大差异,章太炎主张绝对的新闻自由,而孙中山更强调新闻自由应当在法律的框架下才能实现其真正的自由。另一方面,章太炎和孙中山都强调新闻事业的工具理性,认为新闻事业的发展应当是服务于国家和社会发展的。