Effect of binary combination of some plant-derived molluscicides with MGK-264 or piperonyl butoxide on the reproduction of the snail Lymnaea acuminata

The effects of sub-lethal treatments (20 and 60% of 24-h LC(50)) with plant-derived molluscicides Annona squamosa, acetogenins, Argemone mexicana seed and protopine, in combination (1 + 5) with MGK-264 (ENT 8184) or piperonyl butoxide on the reproduction of Lymnaea acuminata has been studied. The plant-derived molluscicides and their active molluscicidal components, protopine and acetogenins, in combination with ENT 8184 or piperonyl butoxide caused a significant reduction in the fecundity, hatchability and survival of young snails. Combination of A squamosa seed powder with piperonyl butoxide was very effective as it caused a complete arrest of snail fecundity within 24 h of treatment. Removal of the snails to fresh water after the 96-h treatments caused a significant recovery in the fecundity of L acuminata.     

H.264在农业视频编解码技术中的应用

比较了常见编码标准,指出H.264更符合我国农业视频传输的要求,分析了H.264编码器和解码器的核心技术,总结了H.264的应用优势以及已经取得的成果。     

Performance Analysis of Motion Estimation Parameters Based on H. 264

H, 264 is the new standard for video coding, it can save 64.46%, 48, 80% and 38.62% bit-rate compared with that of MPEG-2, H. 263 HLP and MPEG-4 ASP respectively under the same decoded picture quality, But the high encoding efficiency is at the cost of heavily increased computational complexity. The multi-prediction macroblock mode search and rate-distortion optimization mode decision that achieve high encoding efficiency are introduced firstly. Then experiment researches are performed to analyze their effect on encoding efficiency. Results show that these two kinds of technique can only achieve slightly improvement on encoding efficiency, but computational complexity increases heavily. This provides an important reference for the parameters selection when H. 264 is used in the practical application of video coding.     

基于3G视频传输的农产品生产过程监控系统设计

为了弥补传统农产品生产过程中动态监控不足、实时决策能力偏弱等缺点,设计了一种集视频采集、视频压缩、3G传输为一体的远程农产品生产过程监控系统。首先,介绍了远程监控系统的全过程;其次,描述了数字信号处理(TMS320DM642)和H.264编码器硬件构成;最后,提供了生产者和消费者的internet和3G手机访问监控管理平台。经试验证明,该系统性能稳定,能够达到预期目的。     

基于Android人工影响天气智能终端的研制与应用

为了快速、准确地实现对人工影响天气作业的响应,建立了一种基于Android的智能移动作业终端系统,详细介绍了该系统的总体框架、主要功能、操作流程,并重点围绕基本指令信息收发、移动GIS平台应用、视频传输应用3个方面,分别就其中的一些关键技术点如自适应心跳包、矢量栅格数据的传输及显示、终端GIS坐标转换、视频编码器的裁剪和优化、流媒体传输优化及差错控制进行了阐述.初步试验结果表明,该系统的特点及优势均较明显.     

Jabber协议与H.264标准在农业远程诊断中的应用研究

阐述了将Jabber协议与H.264标准应用于农业远程诊断的工作原理和各级系统框架,设计并实现农民与专家远程音频、文字、白板等即时通信。系统测试表明,基于Jabber协议与H.264标准的农业远程诊断技术能够实现专家和农户间的双向视频沟通,能帮助农户远程诊断农业病虫害,而且系统在运行过程中消耗网络带宽较少,运行稳定。     

H.264在农业视频编解码技术中的应用

比较了常见编码标准,指出H.264更符合我国农业视频传输的要求,分析了H.264编码器和解码器的核心技术,总结了H.264的应用优势以及已经取得的成果。     

The effect of single, binary, and tertiary combination of few plant derived molluscicides alone or in combination with synergist on different enzymes in the nervous tissues of the freshwater snail Lymnaea (Radix) acuminata (Lamark)

The effect of single, binary, and tertiary combination of few plant derived molluscicides alone or in combination with synergist on different enzymes (acetylcholinesterase—AChE, lactic dehydrogenase—LDH, and acid/alkaline phosphatase—ACP/ALP in the nervous tissue of the freshwater snail Lymnaea acuminata were studied. Sublethal in vivo 24 h exposure to 40 and 80% of LC₅₀ of Azadirachta indica oil (AI), oleoresin of Zingiber officinale (OL), Cedrus deodara oil (CD), Allium sativum (AS), and Polianthes tuberosa (PT) bulb powder singly, their binary combination of AI + OL, AS + CD, AS + PT, CD + OL, CD + PT, OL + PT, and tertiary combination of these binary combinations with the synergist piperonyl butoxide (PB) or MGK-264 significantly altered the activity of these enzymes. Tertiary combination with PB or MGK was very effective. Combination of CD + PT + MGK was more effective against AChE whereas, the combination of CD + OL + PB, CD + AS + PB, and CD + PT + PB were more effective against LDH, ACP, and ALP, respectively.     

Toxicity to the snail Limnaea acuminata of plant‐derived molluscicides in combination with synergists

The effects of combinations of plant‐derived molluscicides with piperonyl butoxide (PB) or ENT 8184 (MGK‐264) were studied on different enzyme activities and biogenic amine levels in the nervous tissue of Limnaea acuminata. 24‐h in vivo exposure of the nervous tissue of L acuminata to 40% and 80% of the 24‐h LC₅₀ of the plant‐derived molluscicides Azadirachta indica oil, Allium sativum powder and oleoresin of Zingiber officinale rhizome and their active molluscicidal components azadirachtin, allicin and [6]‐gingerol, alone or in combination (1 + 5) with PB or ENT 8184, caused a significant reduction in the activity of acetylcholinesterase, lactic dehydrogenase, acid and alkaline phosphatases and sodium‐potassium ATPase. There was a significant increase in the activity of succinic dehydrogenase. In vivo exposure for 24 h to sub‐lethal concentrations of azadirachtin, allicin and [6]‐gingerol, singly and with PB or ENT 8184, significantly altered the dopamine and 5‐hydroxytryptamine levels in the nervous tissue of L acuminata. It is concluded that these active moieties singly or with PB or ENT 8184 adversely affect all known neurotransmission mechanisms in the snail, either separately or through a complex interaction between the different neurotransmitters. © 2000 Society of Chemical Industry