Ecological studies on a tropical limpet Cellana radiata

Some aspects of the habitat zones, distribution pattern, and population density with reference to tidal levels of the tropical limpet Cellana radiata (Born) are presented. Observations have also been made on the homing behaviour of the limpet. Unlike the temperate limpets, no migration to different tidal levels during different seasons was observed in C. radiata.     

海化集团自备热电厂1#炉除尘系统改造

针对海化集团自备热电厂130 t/h煤粉炉原有除尘系统存在的问题进行了全面的分析,在此基础上,结合厂方提出的要求,确定了改造方案,并进行了改造设计.改造后实际运行情况表明:1#炉除尘系统运行良好,除尘效率超出厂方提出的要求,达到98.5%以上.     

欧盟绿色壁垒对我国出口产品的影响分析

欧盟绿色壁垒虽然从客观上促使我国加强环境保护、推进可持续发展战略,但也严重限制了我国主要出口产品的对欧贸易。“绿色”外衣下掩盖的是贸易保护的实质。我国惟有努力提高环保标准和管理水平,提高企业和产品的环境竞争力,才能有效突破绿色壁垒,力争贸易与环保双赢。     

Drivers of deforestation and degradation for 28 tropical conservation landscapes

Analysing the drivers of deforestation and forest degradation in conservation landscapes can provide crucial information for conservation management. While rates of forest loss can be measured through remote sensing, on the ground information is needed to confirm the commodities and actors behind deforestation. We administered a questionnaire to Wildlife Conservation Society’s landscape managers to assess the deforestation drivers in 28 tropical conservation landscapes. Commercial and subsistence agriculture were the main drivers of deforestation, followed by settlement expansion and infrastructure development. Rice, rubber, cassava and maize were the crops most frequently cited as drivers of deforestation in these emblematic conservation landscapes. Landscape managers expected deforestation trends to continue at similar or greater magnitude in the future, calling for urgent measures to mitigate these trends.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01325-9) contains supplementary material, which is available to authorized users.     

Bio-mediated silver nanoparticle synthesis: mechanism and microbial inactivation

Even though plenty of literature is available on the biosynthesis of metal nanoparticles, there are serious lacunae on the mechanisms of their formation. In the present study, the mechanism of formation of mono-crystalline silver nanoparticles using a fruit extract of the ornamental tree Thevetia peruviana is emphasized, i.e. how the pH of the reaction mixture affected reaction kinetics and size of the nanoparticles. The facilitation of formation of Ag₂O at higher pH resulted in a faster rate of particle formation. The diameter of the bare particles at neutral pH determined by field emission scanning electron microscopy and the hydrodynamic diameter determined by dynamic light scattering were 53 and 104 nm, respectively. The silver nanoparticles exhibited good inactivation of Escherichia coli due to participation of free radicals as evidenced by electron spin resonance spectroscopy.