电子鼻技术在肉类品质应用中快速分析初探

电子鼻技术是近年发展起来的一种新型仿生嗅觉检测技术,因其具备快速、无损等优点被广泛应用于食品品质检测领域。电子鼻通常包括两部分:硬件部分——多个性能彼此重叠的气体传感器;软件部分——恰当的模式识别技术对采集信号的分析、处理。本文主要综述了近年来国内外电子鼻技术在肉类品质分析中的应用。首先阐述了电子鼻技术工作原理、数据处理方法,随后重点讨论了电子鼻技术在肉类新鲜度评定、肉与肉制品品质区分、肉类有害成分监测、肉类掺假检测等4个方面的应用进展,最后对电子鼻技术目前存在的问题及未来发展趋势进行了简要探讨。     

物联网关键技术在设施农业中应用探讨

农业物联网是将大量的传感器节点构成监控网络,通过各种传感器采集信息,以便发现问题,并且准确地确定发生问题的位置,从而大量使用各种自动化、智能化、远程控制的生产设备。而设施农业是现代化农业的具体体现和标志,可以获取农业生产高效率与高收益,因此将农业物联网应用到设施农业中,将突破以人力为中心、依赖于孤立机械的农业生产模式转向以信息和软件为中心的生产模式。依据物联网架构设施农业物联网分为感知层、传输层和应用层3部分,分别对应信息感知技术、信息传输技术与信息应用技术。本文通过对国内外设施农业物联网技术最新进展的调研和分析,总结了设施农业物联网在信息感知技术、信息传输技术、信息应用技术以及大数据与设施农业物联网等方面的研究进展,并针对设施农业物联网技术的发展,分别从感知层、传输层、应用层等方面问题提出了建设性意见。     

Incidence of Salmonella spp. in raw vegetables in Selangor,Malaysia

A total of 43 samples of ‘selom’ (Oenanthe stolonifera), 26 samples of ‘pegaga’ (Centella asiatica), 25 samples of ‘kangkong’ (Ipomoea aquatica) and 18 samples of ‘kesum’ (Polygonum minus) were examined for the presence of Salmonella spp. Salmonellae were detected from 40 (35%) of the vegetables samples examined. The most common serotypes isolated were S. weltevreden (23.5%), S. agona (16.2%), S. senftenberg (10.1%) and S. albany (6.7%). The other 27 Salmonella serovars were isolated at frequencies from 0.6% to 3.4%. Several of the Salmonella serotypes isolated in this study have been implicated in human infections in other countries. Although Salmonella species are frequently detected in foods of animal origin, the detection of 31 Salmonella serovars in four local salad vegetables in this study is not very encouraging, and supported the notion that these vegetables can be potential health hazards.