Glutamate and γ-aminobutyric acid receptors and their characteristics in retina

Glutamate and Ⅱ-aminobutyric acid (GABA) are important neurotransmitters in the retinal neuronal circuitry. Using the whole-cell patch clamp technique and a rapid solution changer, glutamate and GABA receptors in the retina have been extensively investigated. Results indicate that glutamate receptors on horizontal cells may be an AMPA preferring subtype, which predominantly consists of flop splice variants. GABAA and GABAC receptors coexist in bipolar cells, with the latter showing significant desensitization. Kinetics analysis has demonstrated that the activation, deactivation and desensitization of the GABAC receptor-mediated response of these cells are overall slower than those of the GABAA response. Endogenous modulator Zn2 + in the retina has been found to differentially modulate the kinetic characteristics of the GABAC and GABAA responses.     

Monitoring gene expression by cDNA array

A new method designated cDNA array was developed by hybridization of quantitatively arrayed DNA samples isolated randomly from a cDNA library with probes reverse-transcribed from mRNAs of different sources or treatments. The gene expression patterns of 1 000 randomly chosen clones from an Arabidopsis library were analyzed with green seedlings versus suspension cells and seedlings irradiated under UV light. Northern blot and sequence analysis of some differentially expressed clones confirmed the results revealed by cDNA array, indicating that this method is efficient and reliable to monitor gene expression.     

自浮颗粒三相体系的搅拌混合技术(Ⅰ)——搅拌桨的影响

研究了搅拌桨型对自浮颗粒三相体系的搅拌混合的功耗、气含率和釜底固含量等的影响,发现液高与釜径比大于１．６时三层桨的混合参数优于两层桨的,提出了最佳的搅拌桨型组合,还回归了其功耗和气含率的关联式     

计算机在热线导热仪的应用

根据目前应用的热线导热仪存在的问题,提出将计算机数据采集与处理系统应用到热线导热仪上测量非金属材料的导热系数,提高导热仪的测试精度和再现性·实验结果表明,计算机在热线导热仪的应用可以大大改善测量结果的准确度和再现性,为其推广应用提供了理论依据·     

含硫芳香族衍生物的厌氧微生物降解

测定了一批苯亚砜基、砜基乙酸酯类化合物的厌氧微生物降解速率常数Ｋｂ,在此基础上对这类化合物的结构与其生物降解速率常数之间的关系进行了分析．表明：苯亚砜基乙酸酯类化合物的降解速率大于苯砜基乙酸酯类化合物;甲酯比异丙酯易降解;苯环上氯取代会降低化合物的生物可降解性     

数据报协议远程网的排队模型

本文对数据报协议远程网进行了性能分析．本文首次指出：数据报协议远程网的排队模型是一种自助服务系统模型．     

零因子个数为n,阶数为(n~2)/2的环

证明了具有ｎ（＞２）个左（右）零因子的环Ｒ,当｜Ｒ｜＝ｎ２２时,必有ｎ＝２ｓ＋１（ｓ∈Ｎ）,｜Ｒ｜＝２２ｓ＋１,且Ｒ的特征是２,４或８．又当Ｒ是特征为２的可换环时,Ｒ只能是有４个零因子的８元环．     

21世纪高校金工实习的走向和对策

针对旧金工实习体系存在的三大弊端,提出了设置“现代工业技术培训”课程及内容的设想,建议成立现代工业技术培训研究和心,使之符合21世纪科技发展和高校教育体制、培养目标变化的新形势。     

发酵液中泰乐菌素测定方法的研究

对发酵液中泰乐菌素含量的两种测定方法（即薄层层析法和高效液相色谱法）进行了比较研究,结果表明,这两种方法都具有较好的分离效果和较高的回收率,回收率分别为９５．９％和９０．３％。说明除了高效液相色谱法外,薄层层析法是一种简易又实用的测定方法