检索结果-南通市图书馆

Study on Red Coat Color Gene and Prediction of the Secondary Structure in Chinese Holstein

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2008年第8期7卷 1016-1021页

作者： LI Qiu-ling LI Jian-bin zhang zheng-feng WANG Hong-mei WANG Chang-fa GAO Yun-dong Hou Ming-hai ZHONG Ji-feng Dairy Cattle Research Center Shandong Academy of Agricultural Sciences Jinan 250100 P.R.China Shandong Computer Science Center Jinan 250014 P.R.China

The nucleotide sequence of the melanocortin-l-receptor （MC1R） gene was studied with the help of the polymerase chain reaction （PCR）, in which the protein structure in Chinese Holstein was predicted, and the molecular mechanism of the red coat color was investigated. Polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP） was performed to genotype the individuals. The bioinformatics and biotechnology softwares were used to predict the secondary structure of MC1R. The results showed that the EE genotype was the dominant genotype in Chinese Holstein Black and White herd, whereas, it was ee in Chinese Holstein Red and White herd. The secondary structure of the mutational MC1R protein was changed and the deletion mutation caused an earlier termination in translation, which led to the formation of the red coat color. The allele E was mainly associated with the black coat color, whereas, e was associated with red.

关键词： bovine red coat color MC1R protein structure

基于社会网络分析的京津冀地区碳排放空间关联与碳平衡分区

在线全文

学校读者我要写书评

暂无评论

中国环境科学 2023年第4期43卷 2057-2068页

作者：张正峰张栋中国人民大学公共管理学院北京100872

基于2005、2010、2015和2017年的碳排放/碳汇数据,利用社会网络分析和探索性空间数据分析对京津冀县级尺度的碳排/碳汇的空间关联作用进行实证分析并进行碳平衡分区划分,提供了在县级空间尺度上划分碳平衡区的路径.研究结果表明:(1)京... 详细信息

基于2005、2010、2015和2017年的碳排放/碳汇数据,利用社会网络分析和探索性空间数据分析对京津冀县级尺度的碳排/碳汇的空间关联作用进行实证分析并进行碳平衡分区划分,提供了在县级空间尺度上划分碳平衡区的路径.研究结果表明:(1)京津冀地区碳排放年均增长率由2005-2010年间的10.05%放缓至2010-2017年间的1.25%,碳汇总量先降后增,2010-2017年间增长15%,但2017年净碳排放量达到了6亿t,反映了当前碳中和压力仍然巨大,京津冀北部和西部是主要的碳补偿率高值区,京津唐、石家庄和邯郸-邢台及其周边地区是主要的碳补偿率低值区;(2)京津冀碳排放空间网络格局逐渐清晰,形成了京津碳排放区、石家庄碳排放区、邯郸碳排放区三个主要的碳排放空间联动区,分别占整个区域面积的36.65%、9.64%、6.76%;(3)根据实证结果,京津冀区域被划分为集中碳汇区、局部调节区、核心-联动碳排区、分散-联动碳排区、分散-孤岛碳排区、一般-联动碳排区、一般-孤岛碳排区7个碳平衡功能区,分别占整个区域面积的22.07%、32.62%、12.81%、0.45%、1.14%、22.55%、8.36%,且有19个关键县域被识别并定义为核心县域、行动县域或桥梁县域.

关键词：碳排放空间关联碳平衡分区社会网络分析

Clinical efficacy of three different minimally invasive procedures for far lateral lumbar disc herniation

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第6期125卷 1082-1088页

作者： LIU Tao ZHOU Yue WANG Jian CHU Tong-wei LI Chang-qing zhang zheng-feng zhang Chao zheng Wen-jie Department of OrTthopaedics Xinqiao HospitalThird Military Medical UniversityChongqing 400037China

Background Far lateral lumbar disc herniation （FLLDH） accounts for 2.6% to 11.7% of all lumbar herniated discs. Numerous surgical approaches have been described for treating this condition. The purpose of this study was to evaluate minimally invasive surgical techniques for the treatment of FLLDH. Methods From June 2000 to March 2006, 52 patients with FLLDH were treated with minimally invasive procedures. All patients were assessed by anteroposterior and lateral roentgenography and computed tomography （CT）. Some patients underwent myelography, discography, and magnetic resonance imaging. Procedures performed included Yeung Endoscopy Spine System （YESS）（n=25）, METRx MicroDiscectomy System （n=13）, and X-tube （n=14）. Patients were followed up for a mean of 13.5 months. Clinical outcomes were assessed using a visual analog scale （VAS） and Nakai criteria. Results All 3 procedures significantly improved radiating leg symptoms （P 〈0.005）. After surgery, 84.0%, 84.6%, and 92.8% of patients in the YESS, METRx, and X-tube groups had excellent or good outcomes. There were no statistically significant differences of VAS scores between the groups. The YESS procedure was associated with the shortest operation time, simplest anesthesia, and least trauma compared with the other 2 procedures, especially for type I herniations. The METRx procedure was the most suitable for type Ⅱ herniations and posterior endoscopic facetectomy. Posterior lumbar interbody fusion and unilateral pedicle screw instrumentation with X-tube was the most suitable for herniations combined with degenerative lumbar instability （type Ⅲ）. Conclusion Minimally invasive strategies and options should be determined with reference to the type of FLLDH.

关键词： microspinal surgery far lateral lumbar disc herniation endoscopy

Changes of serum alpha-fetoprotein and alpha-fetoprotein-L3 after hepatectomy for hepatocellular carcinoma: prognostic significance

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2012年第6期11卷 618-623页

作者： Xiao-feng zhang, zheng-feng Yin, Kui Wang, Zong-Qin zhang, Hai-Hua Qian,Le-Hua ShiAuthor Affiliations: The 4th Department of Hepatic Surgery ,Molecular Oncology Laboratory , Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China [a] The 4th Department of Hepatic Surgery Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai 200438 China [b] Molecular Oncology Laboratory Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai 200438 China

BACKGROUND: Alpha-fetoprotein (AFP) is the most established tumor marker of hepatocellular carcinoma (HCC), but one of its limitations is non-specificity. Many studies have demonstrated that alpha-fetoprotein-L3 (AFP-L3) is more specific than AFP in the early diagnosis and prognosis of HCC. However, there is a lack of knowledge about the post-hepatectomy profiles of serum AFP and AFP-L3 values in HCC patients. To identify the profiles after surgical resection of HCC, we analyzed the correlation between the profiles and postoperative HCC recurrence or survival, and evaluated their utility in predicting postoperative therapeutic efficacy and prognosis. METHODS: From August 2003 to December 2004, 318 patients with positive serum AFP who had received surgical resections were enrolled in this study. Preoperative and postoperative serum AFP and AFP-L3 levels were measured simultaneously and regularly, and their postoperative profiles during a long term follow-up were recorded and summarized. RESULTS: A high ratio of AFP-L3 to total AFP was shown to correlate with pathologic features of aggressiveness. The overall 1-, 3-, and 5-year recurrence rates of the whole series were 28% 57%, and 84%, and the overall survival rates were 86%, 61% and 33%, respectively. The changes of serum AFP and AFP-L3 after hepatectomy for HCC were classified into 3 groups (group A: AFP-L3 undetectable; group B: AFP-L3 10%). Patients with positive postoperative AFP-L3had significantly earlier recurrence than those with negative results. The overall survival was significantly shorter in the positive groups than in the groups negative for postoperative ***: Post-hepatectomy changes in serum AFP and AFP-L3 levels occurred in three distinct patterns, which were closely correlated with HCC recurrence and patient survival with different prognostic values.

关键词： hepatocellular carcinoma hepatectomy alpha-fetoprotein alpha-fetoprotein-L3

Research on the Relationship between Information Technology Capabilities and Sustainable Competitive Advantages of Enterprises

在线全文

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2012年第3期17卷 153-159页

作者： zhang Ming LI zheng-feng YE Jin-fu CHANG Yu School of Management Northwesten Polytechnical University Xi'an 710129 P.R. China

Information technology capabilities and the associated theory of sustainable competitive advantages of enterprises have been studied, respectively. From the resources which form the enterprise information technology capabilities, four factors that affect sustainable competitive advantages： information technology infrastructure, human resources, intangible resources and information technology resources associated have been isolated and their mechanisms have been analyzed.

关键词： information technology resources information technology capabilities sustainable competitive advantages

术中O-Arm 3D成像和导航下引导颈椎前路椎弓根钉置入

在线全文

学校读者我要写书评

暂无评论

中国矫形外科杂志 2017年第16期25卷 1501-1505页

作者：张正丰第三军医大学新桥医院骨科重庆400037

[目的]探讨术中O-Arm 3D成像和导航下引导颈椎前路椎弓根钉置入的技术方法。[方法]采用标准的Smith-Robinson颈椎前路入路。椎间盘切除和安置Cage后,将导航参考架安放在锁骨上。在术中O-Arm 3D成像和导航引导下置入颈椎前路椎弓根钉。... 详细信息

[目的]探讨术中O-Arm 3D成像和导航下引导颈椎前路椎弓根钉置入的技术方法。[方法]采用标准的Smith-Robinson颈椎前路入路。椎间盘切除和安置Cage后,将导航参考架安放在锁骨上。在术中O-Arm 3D成像和导航引导下置入颈椎前路椎弓根钉。术中和术后CT评价前路椎弓根钉置入的准确性。[结果]CT显示前路椎弓根钉准确地置入椎弓根皮质内,无椎动脉和神经损伤。[结论]术中O-Arm 3D成像和导航引导下颈椎前路椎弓根钉置入是一种安全有效的方法。

关键词：颈椎前路椎弓根螺钉术中导航安全

中国近代公立大学董事会制度:一次失败的美国大学制度借鉴

在线全文

学校读者我要写书评

暂无评论

清华大学教育研究 2009年第6期30卷 113-117页

作者：张正峰陕西师范大学教育学院陕西西安710062

在20世纪20年代,我国公立大学将美国大学董事会制度引入到实践层面,产生了不同的反响。董事会制度的设立,一方面适应了当时的形势要求,为有些学校的发展提供了支持;另一方面也带来了董事会与政府、校长、教授在治校上的矛盾。而正是后... 详细信息

在20世纪20年代,我国公立大学将美国大学董事会制度引入到实践层面,产生了不同的反响。董事会制度的设立,一方面适应了当时的形势要求,为有些学校的发展提供了支持;另一方面也带来了董事会与政府、校长、教授在治校上的矛盾。而正是后者导致了它的失败。

关键词：近代公立大学董事会制度

国外可持续土地整理的发展特征及对我国的启示

在线全文

学校读者我要写书评

暂无评论

生态经济 2007年第10期23卷 144-147页

作者：张正峰中国人民大学土地管理系北京100872

目前我国土地整理最突出的问题是由于采用了一些不适当的技术措施而引发生态问题,从而损害了土地整理的可持续性,这已成为制约土地整理发展的主要因素之一。而国外土地整理正朝向综合化、生态化、规范化、科技化和多样化的方向发展。本... 详细信息

目前我国土地整理最突出的问题是由于采用了一些不适当的技术措施而引发生态问题,从而损害了土地整理的可持续性,这已成为制约土地整理发展的主要因素之一。而国外土地整理正朝向综合化、生态化、规范化、科技化和多样化的方向发展。本文通过总结国外可持续土地整理的发展过程和特征,探讨了我国土地整理的目标定位、景观生态保护问题、法律保障、融资方式、公众参与和相关技术,并从土地整理应尽可能保持和提高土地的生产性能、降低工程活动对生态环境的损害、保证组织活动的经济可行性以及使公众接受并积极参与四个方面建立了我国可持续土地整理的判别标准。

关键词：土地整理可持续目标生态社会经济

在线全文

学校读者我要写书评

暂无评论

中国近代大学教授治校制度的特点分析

清华大学教育研究 2008年第6期29卷 74-78页

作者：张正峰陕西师范大学教育科学学院陕西西安710062

教授治校是我国近代大学的一项重要制度。本文认为我国近代大学教授治校制度是少数精英设计的,并在政府主导下建立的,而它的实现也主要是依靠少数精英。且由于它是一种代议制度,先天地具有一定的局限性,这是我们今天要注意的。

关键词：近代大学教授治校特点局限性