爱拔益加肉鸡红细胞免疫吸附性能的研究   总被引：2，自引：0，他引：2  

史钧  吴萍  张彬强 《安徽科技学院学报》2002,16(1):10-11

应用红细胞C3b受体花环(C3b Receptor Rosette,C3bRR)和复合物花环(Immune Complex Rosette,ICR)试验证实爱拔益加肉鸡红细胞表面存在补体C3b受体(C3bR),表明红细胞免疫系统RCIS(Red Cell Immune System)的概念适用于这种动物.文中对红细胞C3bRR和ICR分别代表红细胞表面C3bR"空位"和"占位"状态的含义作出了解释.  相似文献   

A novel MAC mechanism to resolve 802.11 performance anomaly   总被引：1，自引：0，他引：1  

CHENG Yan-hong LI Zhi-shu XING Jian-chuan ZHU Li 《浙江大学学报(A卷英文版)》2007,8(10):1573-1583

In the 802.11b networks, the guarantee of an equal long-run channel access probability causes performance anomaly in a multi-rate wireless cell. Much interest has been involved in this issue and many effective mechanisms have been proposed. The usual MAC layer solutions include the initial contention window adaptation, the maximum transfer unit size adaptation and the packet bursting. In this paper, we propose a novel approach which introduces a new parameter called the transmission prob- ability pt to the legacy protocol. By adjusting pt according to the transmission rate, the proposed scheme can solve the performance anomaly problem cleanly. Throughput analysis and performance evaluation show that our scheme achieves significant im- provement in the aggregate throughput and the fairness.  相似文献   

中西传统绘画的线之比较     

张放 《涪陵师范学院学报》2004,20(3):122-124

线是绘画重要的造型因素之一。中西化精神和艺术观念的差异，使得中西传统绘画对于线的认识与运用呈现出迥异的风格特点。中国传统绘画的线在写形状物的同时，更有抒情达意的追求，它是主体与客体有机交融的产物，是“天人合一”思想的反映。西方传统绘画的线是建立在对形体空间的科学分析与认识基础上的，是对客体的理性再现。它自始至终贯穿着理性的精神，表现出主体受物理时空的制约，同客体始终处于相对对立的状态。  相似文献   

蝴蝶石斛兰工厂化育苗技术的研究   总被引：5，自引：0，他引：5  

黄志明  林庆良  佘慧敏 《莆田学院学报》2002,9(3):22-26

研究蝴蝶石斛兰工厂化育苗技术,实验结果表明:茎尖诱导的最适宜培养基为VW+BA1mg/L+NAA1mg/L;原球茎增殖培养基以VW+BA2.5mg/L+NAA1mg/L为佳;降低培养基BA浓度至1mg/L可以明显提高芽苗的质量;芽苗生根壮苗培养基以VW+香蕉汁10%为佳,试管苗移栽成活率达90%以上。还对蝴蝶石斛兰离体快速繁殖技术的应用价值进行讨论。  相似文献   

利用函数y=kx+b解物理习题     

周蓉 《铜仁学院学报》2007,1(2):123-125

在物理教学中,引导学生将所学的数学知识运用于解决物理问题,有助于学生的认知结构的优化,有助于学生思维能力的增强,有助于学生综合素质的提高。本文介绍了笔者在这方面作的一些探索。  相似文献   

语言共性论     

蒋晓红 《宜春学院学报》2003,25(3):101-103

语言是人类认知现实 ,进行交流的工具。我们生活在一个语言文字的世界里 ,时时刻刻都有人在说话、写字或阅读。语言对人类来说实在是不可或缺的 ,我们的生活越来越有赖于正确而高效地运用语言。这就是语言的共性 (普遍性 )。但我们知道世界上有上千种语言 ,不同的民族使用的是不同的语言 ,这就是语言的个性 (特殊性 )。语言的差异并没有给人类的交流带来障碍 ,在人类的成功交流的后面是什么在起作用 ?这就是撰写本文的目的。许多学者对于语言的个性感兴趣 ,试图挖掘语言的差异性 ,并撰写了许多这方面的文章。正好相反 ,本篇通过分析普遍语法的发展过程 ,着眼于语言共性的研究并试图探索语言共性的本质  相似文献   

Improving Library User Experience: Wi-Fi Network Assessment     

Gordon F. Xu  Jin Xiu Guo 《图书馆管理杂志》2013,53(8):806-834

Abstract

Librarians have been seeking solutions to improve library user experience. The popularity of mobile devices leads to the increasing demand for reliable and efficient wireless communication in libraries. The City Tech librarians make an effort to improve Wi-Fi network to address such challenge. The Wi-Fi survey results indicate that students are dissatisfied with the library Wi-Fi access and hope to get better wireless communication for their mobile devices. To seek approaches to the improvement of Wi-Fi speed and reliability, the authors adopted NetSpot Pro loaded with the library building map to audit wireless network performance. The Wi-Fi site survey shows the library Wi-Fi network has not only weak Wi-Fi signal strength, but also experiences severe interference and overlapping channels. The study suggests that the Library and campus IT can enhance the Wi-Fi network performance by adding more wireless APs and optimizing the locations of existing APs, Wi-Fi network setting, and wireless connection procedure. By upgrading the CUNY Fiber Network and network improvement strategy, the Library can provide effective wireless communication for student learning and research, and ultimately give students memorable library experiences.  相似文献   

Optimization of biotransformation from phytosterol to androstenedione by a mutant Mycobacterium neoaurum ZJUVN-08     

Xiao-yan ZHANG  Yong PENG  Zhong-rui SU  Qi-he CHEN  Hui RUAN  Guo-qing HE 《Journal of Zhejiang University. Science. B》2013,14(2):132-143

Biotransformation of phytosterol(PS) by a newly isolated mutant Mycobacterium neoaurum ZJUVN-08 to produce androstenedione has been investigated in this paper.The parameters of the biotransformation process were optimized using fractional factorial design and response surface methodology.Androstenedione was the sole product in the fermentation broth catalyzed by the mutant M.neoaurum ZJUVN-08 strain.Results showed that molar ratio of hydroxypropyl-β-cyclodextrin(HP-β-CD) to PS and substrate concentrations were the two most significant factors affecting androstenedione production.By analyzing the statistical model of three-dimensional surface plot,the optimal process conditions were observed at 0.1 g/L inducer,pH 7.0,molar ratio of HP-β-CD to PS 1.92:1,8.98 g/L PS,and at 120 h of incubation time.Under these conditions,the maximum androstenedione yield was 5.96 g/L and nearly the same with the non-optimized(5.99 g/L),while the maximum PS conversion rate was 94.69% which increased by 10.66% compared with the non-optimized(84.03%).The predicted optimum conditions from the mathematical model were in agreement with the verification experimental results.It is considered that response surface methodology was a powerful and efficient method to optimize the parameters of PS biotransformation process.  相似文献   

2-取代-5-（2-苯并呋喃基）-2-芳胺基亚甲基-1，3，4-噁二唑类化合物的合成     

杨智  李国威  刘哲 《兰州石化职业技术学院学报》2009,9(1):1-3

回流条件下,以2-氯亚甲基-5-苯并呋喃-1,3,4-噁二唑为中间体,合成了一系列新的1,3,4-噁二唑类化合物。用元素分析、IR及^1HNMR确证了其结构。  相似文献   

Theoretical and experimental study of through-wall microwave tomography inverse problems     

Eugene M. Lavely  Yan Zhang  Edward H. Hill III  Yi-san Lai  Peter Weichman  Angela Chapman 《Journal of The Franklin Institute》2008,345(6):592-617

We consider the problem of building structure estimation using microwave ray tomography. A Bayesian formulation is developed, and a Markov chain Monte Carlo (MCMC) procedure is used to sample the posterior distribution, which is based on a data likelihood defined in terms of a residual misfit between observed and predicted waveforms. To accelerate model optimization, a simulated annealing approach is combined with the MCMC, using specific model moves to explore each component of the model space. Our approach is applicable to data acquired in the frequency or time domain and for monostatic or bistatic acquisition modes. Experimental data for a multi-wall laboratory test structure were acquired using a horn antenna connected to a vector network analyzer and used to validate both the forward model and the inversion approach. Although, in true remote sensing problems for building structure, the model order is usually unknown, in this initial study, the actual inversion experiment is performed in a reduced-dimension model space for which a subset of the variables are taken as known or fixed. Generalization to the variable-dimension problem can be achieved by using reversible jump MCMC sampling procedures.  相似文献