Cold-induced ethylene in relation to chilling injury and chilling sensitivity in the non-climacteric fruit of zucchini (Cucurbita pepo L.)

Zucchini is a non-climacteric fruit which is harvested immature on reaching about 18 cm in length. In the present paper we compare fruit quality parameters in different zucchini cultivars with the production of ethylene and the expression of two ethylene biosynthesis genes (CpACS1 and CpACO1) throughout postharvest storage at 4, 12 and 20 °C. In fruit stored at 12 or 20° ethylene production and expression of CpACS1 and CpACO1 genes remained very low throughout the whole storage period. Ethylene production was also low at 4 °C, but was induced rapidly upon transfer to 20 °C for a minimum of 4 h. The expression of both CpACS1 and CpACO1 genes was also induced by storage at 4 °C. This cold-induced ethylene is not necessary for triggering chilling injury (CI) symptoms in zucchini, since they were already evident in the cold chambers before rewarming of the fruit and, therefore, before the burst of ethylene. However, the level of the cold-induced ethylene was lower in those cultivars that were more tolerant to CI, and it fell in response to temperature conditioning treatments that alleviate CI symptoms.     

基于以太网的智能护理床系统设计与实现

摘要：为了实现对老人、失能人群进行更好的照顾和护理,减少护理人员的工作强度并提高护理效率和护理质量,采用STM32微控制器和ENC28J60以太网芯片设计了一种网络化的智能护理床系统,STM32微控制器通过对护理床传感器信号进行采集和处理,控制护理床系统实现自动接便、左右侧翻、交互式操作、自动报警及网络化管理与集中式监管等功能。经过在某养老院使用证明,该系统安全可靠、操作简单、管理方便,获得了较好的效果。