Tracing regime influence on urban community gardening: How resource dependence causes barriers to garden longer term sustainability

This article explores how resource dependence leads to barriers to urban community gardening. Nine barriers to urban gardening were identified: finance, space, organizational structure, water, external damage, soil, communication, interpersonal issues, and participation issues. Using process tracing and grounded theory, we found that these barriers could be divided into three groups: primary, secondary, and participation barriers. Primary barriers are caused and directly influenced by the regime, whereas secondary barriers are the result of decisions and actions taken while addressing the primary barriers. All of these barriers cause frustration and affects the ability of the gardens to retain and acquire new members. This affects the longer term sustainability of the gardens and their potential to contribute to an urban governance transition.     

微切助互作技术辅助提取辣椒红色素的研究

为研究微切助互作技术辅助提取辣椒中辣椒红色素的最佳工艺条件,本试验以辣椒红色素的吸光度和色价为指标,考察微切助互作技术辅助提取辣椒中辣椒红色素的影响因素,并通过正交试验确定最佳工艺。结果表明：最佳提取条件为Na2CO3助剂用量为5％（w／w）,研磨时间为40min,溶液95％乙醇,料液比为1：70（g：ml）。在该条件下检测红色素色价,较热回流法提高了15．09％。