Toxic effect of cadmium nitrate on the liver ofChanna punctatus

Summary Exposure of a fresh water fish,Channa punctatus, in a medium containing as low as 0.01 ppm of cadmium nitrate, resulted in the necrosis of hepatic cells. A temporary recovery of these cells was however observed when the animals were exposed to lower concentrations.The investigations were carried out in the Department of Zoology, Gujarat University, Ahmedabad. One of us (Punita Shah) wishes to thank UGC for the award of JRF during present investigations.     

臭氧对小白鼠生长及学习行为影响的初步研究

本实验用0.50——1.00ppm 浓度的臭氧处理小白鼠66小时。实验结果初步表明:小白鼠在接受臭氧处理后,体重增长较缓,条件反射活动不易建立,学习能力明显地低于对照组。     

A laminin-like adhesive protein concentrated in the synaptic cleft of the neuromuscular junction

A striking example of topographic specificity in synapse formation is the preferential reinnervation of original synaptic sites on denervated muscle fibres by regenerating motor axons. This specificity is mediated by the basal lamina of the synaptic cleft. A glycoprotein, s-laminin, has now been identified that is selectively associated with synaptic basal lamina and is recognized by motoneurons. Molecular cloning reveals that s-laminin is a novel homologue of laminin, a potent promoter of neurite outgrowth.     

Bioconversion of low quality lignocellulosic agricultural waste into edible protein by Pleurotus sajor-caju (Fr.) Singer

Pleurotus sajor-caju (Fr.) Singer was cultivated on selected agro wastes viz. cotton stalks, groundnut haulms, soybean straw, pigeon pea stalks and leaves and wheat straw, alone or in combinations. Cotton stalks, pigeon pea stalks and wheat straw alone or in combination were found to be more suitable than groundnut haulms and soybean straw for the cultivation. Organic supplements such as groundnut oilseed cake, gram powder and rice bran not only affected growth parameters but also increased yields. Thus bioconversion of lignocellulosic biomass by P. sajor-caju offers a promising way to convert low quality biomass into an improved human food.     

Interference-Aware Multipath Routing Protocol for QoS Improvement in Event-Driven Wireless Sensor Networks

The existing multipath routing protocols for wireless sensor networks demonstrate the efficacy of traffic distribution over multiple paths to fulfill the Quality of Service (QoS) requirements of different applications.However,the performance of these protocols is highly affected by the characteristics of the wireless channel and may be even inferior to the performance of single-path approaches.Specifically,when multiple adjacent paths are being used concurrently,the broadcast nature of wireless channels res...     

柿产业存在的问题及发展对策

柿树是我国主栽果树种类之一,栽培历史悠久.从柿子品种资源丰富,栽培管理容易,市场需求大和产品品种多样等方面分析了我国发展柿产业的优势.通过对我国柿树生产、保鲜加工技术和营销方面所存在问题的研究,提出发展柿产业相应的对策:1)调整品种结构,培育和引进优良品种,普及栽培技术;2)加强柿贮藏保鲜和加工技术的研究;3)合理布局,发挥地域优势,发展特色产业链;4)建立服务体系,完善营销渠道.     

Structure and properties of solid-state synthesiz ed poly (3,4-propylenedi oxythiophene) /nano-ZnO composite

Poly（3,4-propylenedioxythiophene）/nano-Zinic Oxide（PProDOT/ZnO） composites with the content of 3-7 wt%nano-ZnO were synthesized by the solid-state method with FeCl₃ as oxidant.The structure and morphology of the composites were characterized by Fourier transform infrared（FTIR）spectroscopy,ultraviolet-visible（UV-vis） absorption spectroscopy,X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The electrochemical performances of the composites were investigated by galvanostatic charge-discharge,cyclic voltammetry and electrochemical impedance spectroscopy（EIS）.The photocatalytic activities of the composites were investigated by the degradation of methylene blue（MB） dyes in aqueous medium under UV light irradiation.The results from FTIR and UV-vis spectra showed that the PProDOT/ZnO composites were successfully synthesized by solid-state method,and nano-ZnO had great influences on the conjugation length and oxidation degree of the polymers.Furthermore,the PProDOT/5 wt%ZnO had the highest conjugation and oxidation degree among the composites.The results of XRD analysis indicated that there were some FeCl₄^- ions as doping agent in the PProDOT matrix,and the content of ZnO had no effect on diffraction pattern of PProDOT.Morphological studies revealed that the pure PProDOT and composites had similar morphological structure,and all the composites displayed an irregular sponge like morphology.The results of electrochemical tests showed that the PProDOT/5 wt%ZnO had a higher electrochemical activity with a specific capacitance value of 220 F g^-1 than others.The results from photocatalytic activities of the composites indicated that the PProDOT/5 wt%ZnO had better photocatalytic activity than other composites.     

高职院校双语教学的实践与探讨

双语教学,是对外开放的产物,是加强与使用英语国家进行经济、文化、生活等方面进行交流的需要。开展双语教学,就是在课堂上,能够熟练运用汉语、英语两门语言进行学科的教与学,师生共同进入一种的汉语和英语教与学的环境,并熟练地运用汉语和英语进行学科知识上的教学与交流,最终达到师生均能运用两种语言、两种思维方式进行学科学习、思考和研究。