期刊文献+
共找到16,750篇文章
< 1 2 250 >
每页显示 20 50 100
选择性凝血因子XI抑制剂在血栓性疾病治疗中的临床研究进展
1
作者 张琴 张冬颖 王曦 《四川医学》 CAS 2024年第3期309-314,共6页
血栓性疾病是当今社会的一个重要医疗问题,动脉内血栓形成是引起心肌梗死、缺血性脑卒中、急性肢体缺血的最常见原因,静脉内血栓则可能导致肢体缺血坏死及肺栓塞等严重后果,这些疾病每年共导致全球1000多万人死亡,占所有疾病死亡的50%以... 血栓性疾病是当今社会的一个重要医疗问题,动脉内血栓形成是引起心肌梗死、缺血性脑卒中、急性肢体缺血的最常见原因,静脉内血栓则可能导致肢体缺血坏死及肺栓塞等严重后果,这些疾病每年共导致全球1000多万人死亡,占所有疾病死亡的50%以上,在过去的20年内,这一比例更是增加了25%~35%[1]。目前,抗凝剂是预防和治疗血栓形成的主要手段之一。 展开更多
关键词 凝血因子xi 抗凝药物 反义寡核苷酸 单克隆抗体 小分子抑制剂
下载PDF
终末期肝病模型-XI评分对急性心肌梗死冠状动脉支架植入术后患者预后的预测价值
2
作者 公方娜 单鸿伟 +3 位作者 廉明 宝璐尔 阿拉腾宝力德 关宏 《中国循证心血管医学杂志》 2024年第8期983-985,共3页
目的 探讨终末期肝病模型-XI(MELD-XI)评分对急性心肌梗死患者冠状动脉支架植入术后的预后的预测价值。方法 回顾性收集2021年1月至2022年12月于内蒙古医科大学附属医院收治的急性心肌梗死患者226例,根据入院时MELD-XI评分,将患者分为高... 目的 探讨终末期肝病模型-XI(MELD-XI)评分对急性心肌梗死患者冠状动脉支架植入术后的预后的预测价值。方法 回顾性收集2021年1月至2022年12月于内蒙古医科大学附属医院收治的急性心肌梗死患者226例,根据入院时MELD-XI评分,将患者分为高MELD-XI评分组和低MELD-XI评分组,每组各113例。比较两组患者近、远期预后。结果 与低MELD-XI评分组比较,高MELD-XI评分组患者左室射血分数(LVEF)显著降低[(51.67±7.91)%vs.(60.91±5.91)%],(P<0.001);N末端脑钠肽前体(NT-proBNP)显著增高(822.87±462.38) vs.(701.84±338.21)ng/L,(P=0.026)。与低MELD-XI评分组比较,高MELD-XI评分组患者不良结局事件的发生率显著增高(16.81%vs. 6.19%,P=0.012)。MELD-XI评分对急性心肌梗死冠状动脉支架植入术后不良结局事件具有一定的预测价值,曲线下面积为0.732,95%CI:0.671~0.798,(P<0.001)。结论 MELD-XI对于预测急性心肌梗死患者预后具有一定的参考价值。 展开更多
关键词 终末期肝病模型-xi 急性心肌梗死 心脏功能 预后 冠状动脉支架植入术
下载PDF
杜梨LRR-XI-a亚家族的鉴定及调控腐烂病抗性的成员筛选
3
作者 蔡敏蕊 田玉珍 +2 位作者 孙娥 郑艳 左存武 《核农学报》 CAS CSCD 北大核心 2024年第8期1425-1433,共9页
为探究LRR-XI-a基因家族在杜梨免疫系统中的作用机制,基于GDR数据库的杜梨基因组数据鉴定了杜梨LRR-XI-a家族成员,经进化特征、基因重复事件和表达模式分析筛选了响应腐烂病信号的成员,并结合果实瞬时表达和抗性基因表达分析对部分成员... 为探究LRR-XI-a基因家族在杜梨免疫系统中的作用机制,基于GDR数据库的杜梨基因组数据鉴定了杜梨LRR-XI-a家族成员,经进化特征、基因重复事件和表达模式分析筛选了响应腐烂病信号的成员,并结合果实瞬时表达和抗性基因表达分析对部分成员的功能进行了初步分析。结果表明,杜梨LRR-XI-a基因家族包含91个成员,进化上可分为6个亚组。基因重复分析结果表明,杜梨中GroupⅠ成员数的迅速增加可能由串联复制(TD)和全基因组复制(WGD)共同导致,而GroupⅥ成员的增加仅由WGD所致。顺式作用元件分析结果表明,杜梨LRR-XI-a亚组Ⅱ和Ⅵ可能主要参与杜梨对非生物逆境信号的响应,而其余4个亚组同时参与对生物和非生物逆境信号的响应。表达分析结果表明,LRR-XI-4和LRR-XI-5在腐烂病侵染后呈不同程度的上调表达,其中LRR-XI-5上调表达量可达对照的586倍以上。果实瞬时表达分析结果表明,过表达LRR-XI-4和LRR-XI-5降低了梨果实对腐烂病的抗性,抑制了JA信号通路基因的表达,但激活了超敏反应响应基因的表达。综上,基因重复导致杜梨LRR-XI-a家族成员发生迅速增加;LRR-XI-a家族成员响应不同的生物胁迫和非生物胁迫;LRR-XI-4和LRR-XI-5通过激活超敏反应(HR)相关基因的表达负调控腐烂病抗性,可作为后期腐烂病抗性研究的候选基因。本研究结果为后续开展梨抗病机理研究和分子育种奠定了基础。 展开更多
关键词 杜梨 LRR-xi-a 基因家族 基因重复 腐烂病
下载PDF
System and Realization Path of Xi Jinping's Eco-poverty Alleviation Concept under the Vision of Green Development
4
作者 Xieyu XIONG Jialin LIU Wanxuan WU 《Meteorological and Environmental Research》 2024年第3期23-31,共9页
Since the 18 th National Congress of the Communist Party of China,General Secretary Xi Jinping delivered a series of speeches on ecological environment and poverty governance,forming the Xi Jinping's eco-poverty a... Since the 18 th National Congress of the Communist Party of China,General Secretary Xi Jinping delivered a series of speeches on ecological environment and poverty governance,forming the Xi Jinping's eco-poverty alleviation ideology.In this paper,the Xi Jinping's eco-poverty alleviation ideology is taken as the research object.Using the methods of literature analysis and comparative analysis,the origin of eco-poverty alleviation theory is explored from the common prosperity theory and the theory of ecological capital,and the practice foundation is found out from practical cases.The relationship between the ecological damage and poverty is systematically analyzed,and the mechanism of ecological poverty is explored in detail.The basic connotation of Xi Jinping's eco-poverty alleviation is expounded,and it consists of three parts:guiding ideology layer,implementation layer,and guarantee layer.By perfecting and innovating the market mechanism,social management mechanism,performance evaluation mechanism,integration mechanism with other poverty alleviation methods,and ecological immigration mechanism of ecological poverty,the realization of Xi Jinping's eco-poverty alleviation concept could be guaranteed. 展开更多
关键词 Green transformation xi Jinping's eco-poverty alleviation Ecological capital
下载PDF
English Translation of Chinese Natural Ecological Discourse:A Corpus-based Case Study on Xi Jinping:The Governance of China
5
作者 TANG Yi 《Journal of Literature and Art Studies》 2024年第5期355-359,共5页
Amid the increasingly severe global natural eco-environment,it is necessary to build a natural ecological civilization by constructing an ecological civilization discourse.Against this background,this study compiles a... Amid the increasingly severe global natural eco-environment,it is necessary to build a natural ecological civilization by constructing an ecological civilization discourse.Against this background,this study compiles a corpus of natural ecological discourse in the English translation of Xi Jinping:The Governance of China(short for Xi).By using Wordsmith and AntConc,this study explores the linguistic features of the ecological discourse in English translation of Xi in the following dimensions,including high-frequency words,keywords,word collocations,concordance lines.This study aims to analyze the concepts and attitudes towards natural ecology,so as to provide certain valuable insights for the construction of China’s discourse on natural ecological civilization.The study found that the natural ecology discourse involving in the English translation of Xi turned out to be ecologically beneficial. 展开更多
关键词 xi Jinping:The Governance of China ecological discourse analysis English translation corpus
下载PDF
达芬奇机器人(Xi)辅助下直肠前切除术(NOSES-Ⅳ式)
6
作者 王凯 李腾腾 +2 位作者 张轩 符炜 付海啸 《手术电子杂志》 2024年第2期22-23,共2页
达芬奇机器人(Xi)系统联合经自然腔道取标本(NOSES)在直肠癌手术中的应用日益成熟和普遍.二者的结合充分发挥了各自的优势,将层面的游离,淋巴的清扫,血管的解剖,神经的保护和无菌、微创理念贯穿始终.因此,机器人下的手术操作,规范的手... 达芬奇机器人(Xi)系统联合经自然腔道取标本(NOSES)在直肠癌手术中的应用日益成熟和普遍.二者的结合充分发挥了各自的优势,将层面的游离,淋巴的清扫,血管的解剖,神经的保护和无菌、微创理念贯穿始终.因此,机器人下的手术操作,规范的手术流程,经自然腔道取标本的微创模式,为程序化的直肠癌根治手术带来了新的进步. 展开更多
关键词 达芬奇机器人(xi)系统 经自然腔道取标本 直肠前切除术
下载PDF
达芬奇Xi系统机器人辅助后腹腔镜肾上腺切除术治疗肾上腺肿瘤的疗效观察 被引量:1
7
作者 刘志飞 蔡启亮 +3 位作者 邢力永 朱研峰 孟建利 谢华 《中国临床医生杂志》 2023年第8期949-952,共4页
目的 探讨达芬奇Xi系统机器人辅助后腹腔镜肾上腺切除术治疗肾上腺肿瘤的临床效果。方法 选取2019年1月至2022年1月河北省唐山市人民医院收治并经病理确诊的肾上腺肿瘤患者97例进行回顾性研究,根据治疗方法分为机器人手术组46例(采用达... 目的 探讨达芬奇Xi系统机器人辅助后腹腔镜肾上腺切除术治疗肾上腺肿瘤的临床效果。方法 选取2019年1月至2022年1月河北省唐山市人民医院收治并经病理确诊的肾上腺肿瘤患者97例进行回顾性研究,根据治疗方法分为机器人手术组46例(采用达芬奇Xi系统机器人辅助后腹腔镜肾上腺切除术治疗)和传统腹腔镜手术组51例(采用传统后腹腔镜肾上腺切除术治疗)。比较两组手术相关指标,统计两组并发症情况、随访情况。结果 两组术中出血量、手术时间比较,差异无显著性(P>0.05);与传统腹腔镜手术组相比,机器人手术组肿瘤直径较大,中转开腹率、术后出血率降低,术后止痛剂使用次数更少,术后引流时间、术后住院时间、下床活动时间及术后胃肠功能恢复时间明显缩短,住院费用有所增加,差异有显著性(P<0.05)。与传统腹腔镜手术组相比较,机器人手术组术中并发症发生率明显降低,差异有显著性(P<0.05),而两组术后并发症发生率、术后血压改善情况、肿瘤复发率、是否需长期口服激素差异无显著性(P>0.05)。结论 达芬奇Xi系统机器人辅助后腹腔镜肾上腺切除术治疗肾上腺肿瘤,手术创伤小,术中并发症发生率低,患者恢复快,且不增加手术时间。 展开更多
关键词 肾上腺肿瘤 后腹腔镜肾上腺切除术 达芬奇xi系统机器人
下载PDF
A Comparative Study of YīJiàn Xiǎo Shìand A Small Incident Rendered by the Yangs
8
作者 WANG Zai-jun ZHANG Jun-feng ZHANG Shun-sheng 《Journal of Literature and Art Studies》 2023年第11期825-830,共6页
Lu Xun’s short stories play a prominent role in the history of modern Chinese literature,and a number of Sinologists have studied them and published their English translations.This paper selects“YīJiàn Xiǎo S... Lu Xun’s short stories play a prominent role in the history of modern Chinese literature,and a number of Sinologists have studied them and published their English translations.This paper selects“YīJiàn Xiǎo Shì”in Lu Xun’s collection“Call to Arms”as the object of study,taking hypotaxis and parataxis as the starting point,and compares the translation of Yang Hsien-yi and Gladys Yang with the original version,studying the differences between the them in the process of C-E translation.It is hoped that some flexible conversion strategies in English-Chinese translation can be learned from the translation research. 展开更多
关键词 YīJiàn xiǎo Shì A Small Incident rendered by Yang Hsien-yi&Gladys Yang hypotaxis and parataxis comparative study
下载PDF
达芬奇Xi机器人在单侧腋窝入路免充气甲状腺手术中的临床应用分析 被引量:1
9
作者 史荣亮 张婷婷 +10 位作者 王宇 倪兆娴 王慧 王玉龙 魏文俊 向俊 渠宁 卢忠武 范鹃 顾玮瑾 嵇庆海 《中国癌症杂志》 CAS CSCD 北大核心 2023年第11期1018-1025,共8页
背景和目的:2007年,Kang等第1次将机器人手术应用于甲状腺,之后机器人甲状腺手术在全球范围内开展。因安全性、肿瘤治疗的根治性和美容性不断得到验证,腋窝入路比例在国内正在快速增长。本研究通过对比分析使用达芬奇Xi机器人完成的95... 背景和目的:2007年,Kang等第1次将机器人手术应用于甲状腺,之后机器人甲状腺手术在全球范围内开展。因安全性、肿瘤治疗的根治性和美容性不断得到验证,腋窝入路比例在国内正在快速增长。本研究通过对比分析使用达芬奇Xi机器人完成的95例单侧腋窝入路免充气甲状腺手术与91例传统手术治疗cN0期甲状腺微小乳头状癌(papillary thyroid microcarcinoma,PTMC)的临床疗效,探讨达芬奇Xi机器人单侧腋窝入路手术治疗PTMC的优势及临床应用价值。方法:回顾性分析2020年3月—2021年11月复旦大学附属肿瘤医院头颈外科收治的186例cN0期单侧单灶PTMC患者的临床数据,根据手术方式分为机器人组(95例)和开放组(91例),分析比较两组患者的一般临床资料、手术结果、术后并发症、切口满意度、学习曲线及手术费用等情况。结果:两组患者在性别、年龄、是否合并桥本甲状腺炎、肿瘤直径及病灶位置方面差异无统计学意义(P>0.05)。机器人组手术时间[(126.65±34.76)min]长于开放组[(60.99±21.12)min],在经历36例手术后手术时间可达稳定水平。手术费用[(47940.66±4404.30)元]高于开放组[(15807.73±2295.35)元]。在术中出血量[机器人组:(20.48±18.83)mL;开放组:(16.15±13.95)mL]、清扫淋巴结个数[机器人组:(2.61±2.77)枚;开放组:(2.97±2.20)枚]和检出阳性淋巴结个数[机器人组:(1.01±1.61)枚;开放组:(0.78±1.36)枚]方面差异无统计学意义(P>0.05)。机器人组术后暂时性声嘶(1.10%)低于开放组(2.20%),但差异无统计学意义(P>0.05)。机器人组术后切口满意度(非常满意87.4%,比较满意11.6%)高于开放组(非常满意71.4%,比较满意26.4%),差异有统计学意义(P<0.05)。结论:达芬奇Xi机器人单侧腋窝入路免充气甲状腺手术不仅具有良好的美容效果,较高的患者满意度,而且学习曲线短,术中出血量、淋巴结检测情况及术后并发症发生情况与传统手术相当。 展开更多
关键词 甲状腺微小乳头状癌 达芬奇xi机器人 传统开放手术 甲状腺切除术
下载PDF
From Hai Yao, Yang Yao to Xi Yao: Sinification of Material Medical from the West 被引量:1
10
作者 Patrick Chiu 《Chinese Medicine and Culture》 2023年第4期319-329,共11页
In ancient China, Daoist philosophers developed the concepts of qi(energy), Wu Xing(five elements), and yin(feminine, dark, negative) and yang(masculine, bright, positive) opposite forces between 200 and 600 BCE. Base... In ancient China, Daoist philosophers developed the concepts of qi(energy), Wu Xing(five elements), and yin(feminine, dark, negative) and yang(masculine, bright, positive) opposite forces between 200 and 600 BCE. Based on these philosophies, Zhen Jiu(acupuncture), Ben Cao(materia medica), and the practice of Qi Gong(energy optimization movements) evolved as the three interrelated therapeutic regimens of Chinese medicine(Note 1). Since the time of Zhang Qian, who discovered China's western regions in the 1st century BCE, Hai Yao(the exotic elements of materia medica from the maritime Silk Road countries), had been transmitted from the ancient land and maritime routes of the Silk Road to China in the past two millennia(Note 2). Since the late 17th century, the English East India Company, later called the British East India Company, introduced Yang Yao(opium) to the Manchu Qing Empire to balance a growing trade deficit for tea export from China to the British Empire. After the First Opium War ended in 1842, enterprising expatriate chemists and druggists in the treaty ports imported Xi Yao(modern medicines from the Western world) for sale to the merchant navy and the local market. From the second half of the 19th century onwards, both Hai Yao and Xi Yao have become a fully integrated part of modern China's armamentarium for the Chinese medicine and Western hospitals and retail pharmacy sectors. This paper articulates the journey of adoption of exotic elements of materia medica from the ancient land and sea routes of the Silk Road, including the western regions and the rest of the world in the past two millennia. Opium traders, ship surgeons, medical and pharmaceutical missionaries, enterprising traders, and policymakers together transformed Ben Cao into Xi Yao during the late Manchu Qing dynasty and the early Nationalist Era. 展开更多
关键词 Hai Yao Materia Medica Opium Cures xi Yao Yang Yao
下载PDF
Spatiotemporal Evolution Characteristics of Urban Land Surface Temperature Based on Local Climate Zones in Xi’an Metropolitan,China
11
作者 ZHANG Liping ZHOU Liang +4 位作者 YUAN Bo HU Fengning ZHANG Qian WEI Wei SUN Dongqi 《Chinese Geographical Science》 SCIE CSCD 2023年第6期1001-1016,共16页
Local climate zones(LCZs)are an effective nexus linking internal urban structures to the local climate and have been widely used to study urban thermal environment.However,few studies considered how much the temperatu... Local climate zones(LCZs)are an effective nexus linking internal urban structures to the local climate and have been widely used to study urban thermal environment.However,few studies considered how much the temperature changed due to LCZs transformation and their synergy.This paper quantified the change of urban land surface temperature(LST)in LCZs transformation process by combining the land use transfer matrix with zonal statistics method during 2000–2019 in the Xi’an metropolitan.The results show that,firstly,both LCZs and LST had significant spatiotemporal variations and synchrony.The period when the most LCZs were converted was also the LST rose the fastest,and the spatial growth of the LST coincided with the spatial expansion of the built type LCZs.Secondly,the LST difference between land cover type LCZs and built type LCZs gradually widened.And LST rose more in both built type LCZs transferred in and out.Finally,the Xi’an-Xianyang profile showed that the maximum temperature difference between the peaks and valleys of the LST increased by 4.39℃,indicating that localized high temperature phenomena and fluctuations in the urban thermal environment became more pronounced from 2000 to 2019. 展开更多
关键词 urban land surface temperature(LST) local climate zones(LCZs) thermal environment time series urban sustainable development xi’an metropolitan China
下载PDF
Proof of Riemann Conjecture Based on Contradiction between Xi-Function and Its Product Expression
12
作者 Chuanmiao Chen 《Advances in Pure Mathematics》 2023年第7期463-472,共10页
Riemann proved three results: analytically continue ζ(s) over the whole complex plane s =σ + it with a pole s =1;(Theorem A) functional equation ξ(t) = G(s<sub>0</sub>)ζ (s<sub>0</sub>), s&... Riemann proved three results: analytically continue ζ(s) over the whole complex plane s =σ + it with a pole s =1;(Theorem A) functional equation ξ(t) = G(s<sub>0</sub>)ζ (s<sub>0</sub>), s<sub>0</sub> =1/2 + it and (Theorem B) product expression ξ<sub>1</sub>(t) by all roots of ξ(t). He stated Riemann conjecture (RC): All roots of ξ (t) are real. We find a mistake of Riemann: he used the same notation ξ(t) in two theorems. Theorem B must contain complex roots;it conflicts with RC. Thus theorem B can only be used by contradiction. Our research can be completed on s<sub>0</sub> =1/2 + it. Using all real roots r<sub>k</sub><sub> </sub>and (true) complex roots z<sub>j</sub> = t<sub>j</sub> + ia<sub>j</sub> of ξ (z), define product expressions w(t), w(0) =ξ(0) and Q(t) > 0, Q(0) =1 respectively, so ξ<sub>1</sub>(t) = w(t)Q(t). Define infinite point-set L(ω) = {t : t ≥10 and |ζ(s<sub>0</sub>)| =ω} for small ω > 0. If ξ(t) has complex roots, then ω =ωQ(t) on L(ω). Finally in a large interval of the first module |z<sub>1</sub>|>>1, we can find many points t ∈ L(ω) to make Q(t) . This contraction proves RC. In addition, Riemann hypothesis (RH) ζ for also holds, but it cannot be proved by ζ. 展开更多
关键词 Riemann Conjecture xi-Function Functional Equation Product Expression Multiplicative Group CONTRADICTION
下载PDF
The Preliminary Study of Certain Pharmacological Effects of Xi Xin Oil 被引量:2
13
作者 胡月娟 徐军 纪绿屏 《Journal of Chinese Pharmaceutical Sciences》 CAS 1993年第2期156-158,共3页
细辛油能松弛兔离体主动脉条,使去甲肾上腺素所致主动脉收缩的量效曲线右移并效能降低;使离体兔耳灌流量减少;能延长小鼠常压耐缺氧时间;用其1/2 LD_(50)之剂量腹腔注射给药3天,可致小鼠骨髓微核形成增加。
关键词 xi xin Oil Aorta strip Anoxia tolerance Micronucleus test
下载PDF
凝血因子XI——一个抗血栓治疗的新靶标 被引量:3
14
作者 禹华玮 冶洪 梁冰 《实用医药杂志》 2014年第2期170-172,共3页
凝血因子Ⅺ(FⅪ)作为凝血接触激活途径的一员首先被大家认识.然而随着研究的深入,人们对传统的瀑布凝血理论进行了修正,修正的理论认为:FXI可被凝血酶激活,并且在持续不断的凝血酶的生成和纤维蛋白溶解的抑制中发挥作用.FXI在血栓形... 凝血因子Ⅺ(FⅪ)作为凝血接触激活途径的一员首先被大家认识.然而随着研究的深入,人们对传统的瀑布凝血理论进行了修正,修正的理论认为:FXI可被凝血酶激活,并且在持续不断的凝血酶的生成和纤维蛋白溶解的抑制中发挥作用.FXI在血栓形成和止血中发挥不成比例的作用,人类先天FXI缺乏者一般只有轻度的受伤后出血,FXI缺乏或FXI抑制的动物出血也不受影响,说明FXI的放大途径对体内正常止血的作用不大.但是最近的动物实验揭示,FXI在病理性血管内凝血过程中起着重要的作用.本文将要讨论FXI在体内血栓形成和止血中的作用及在实验动物模型中FXI抑制的效果,阐述使用反义技术对FXI的抑制作用.反义技术是一种有广阔应用前景的FXI抑制的新方法,可能为治疗和阻止人类血栓栓塞性疾病提供一种较为安全的方法. 展开更多
关键词 凝血因子xi(Fxi) Fxi缺乏 Fxi抑制 血栓形成 反义治疗
下载PDF
牛凝血因子XI基因15bp插入突变的分子检测及基因频率分析 被引量:1
15
作者 李强 张毅 +7 位作者 王雅春 吴蒙 徐仙洲 张智军 孙东晓 俞英 张胜利 张沅 《畜牧兽医学报》 CAS CSCD 北大核心 2013年第8期1213-1218,共6页
牛凝血因子XI基因第9外显子15bp插入突变是近年在日本和牛中发现的一种遗传缺陷,导致凝血因子活性降低。为了分析该缺陷基因在我国牛群中的携带频率,本研究开发了能灵敏检测该突变的2种新方法,即毛细管电泳法和等位基因特异性扩增法,并... 牛凝血因子XI基因第9外显子15bp插入突变是近年在日本和牛中发现的一种遗传缺陷,导致凝血因子活性降低。为了分析该缺陷基因在我国牛群中的携带频率,本研究开发了能灵敏检测该突变的2种新方法,即毛细管电泳法和等位基因特异性扩增法,并检测了我国引进的和牛种公牛、1个含和牛血液的杂交育种群和商品群、4个国内地方品种(鲁西牛、延边牛、蒙古牛、复州牛)、2个培育品种(中国荷斯坦牛、新疆褐牛)和6个国外品种(西门塔尔、夏洛来、利木赞、安格斯、蒙贝利亚、挪威红牛)样品共452头份。结果显示,在和牛、含和牛血液的杂交育种群及商品群中突变基因频率分别为0.182、0.389和0.242,在延边牛中发现1头携带者,而在其余群体中均未检出,推测该突变可能只存在于东北亚和我国东北地区牛群中。今后我国在引进和牛用于杂交改良以及本地牛选育中需要对该突变进行分子检测和逐步淘汰,从而降低不利等位基因的频率。 展开更多
关键词 凝血因子xi 遗传缺陷 和牛 毛细管电泳 等位基因特异性扩增
下载PDF
The Study on Tourist Destination Tourism Image Perception and Evaluation in Xi'an City 被引量:2
16
作者 王东红 李开宇 +2 位作者 郝凤娇 孙鹏 姚蓉 《Agricultural Science & Technology》 CAS 2013年第9期1285-1288,1343,共5页
[Objective] The aim was to explore the tourist destination image measurement method, and have an empirical study on Xi'an City. [Method] With combination of non-structural and structured approach to design questionna... [Objective] The aim was to explore the tourist destination image measurement method, and have an empirical study on Xi'an City. [Method] With combination of non-structural and structured approach to design questionnaires, tourism image of Xi'an was explored using the SPSS software from both the qualitative and quantitative analyses. [Result] Xi'an tourism images serve a heritage historical monuments atmosphere with the Terracotta Warriors, City Wall, Big Wild Goose Pagoda,Huaqing Hot Springs, presenting a positive feeling among tourists in general. In the dissemination of travel, tourism infrastructure construction, tourism transportation,travel services have negative effects on the image of Xi'an tourism. [Conclusion]The evaluation on the tourism resources is highly spoken of by tourists than the scenic spot, indicating that despite high visibility of tourism resources in Xi'an, it has not formed strong core competitiveness and a complete tourism industrial chain. It is necessary to take the right marketing strategies to enhance tourist familiarity to Xi'an. Tourists demands, therefore, should be well considered in developing Xi'an scenic spots and new tourism products and projects be focused on to improve tourists' satisfaction. 展开更多
关键词 Tourism destination Image perception Structural method Non-structural method xi'an
下载PDF
Development Strategies for Modern Agricultural Logistics in Xi'an Based on Systematic Diynamics 被引量:2
17
作者 李琰 哈奔 李红霞 《Agricultural Science & Technology》 CAS 2011年第9期1252-1255,1259,共5页
[Objective] The devlopmental stratagies for modern agricultural logistics industry in Xi’an were studied based on system dynamics.[Method] By dint of system dynamics,reality analysis and relevant data were applied to... [Objective] The devlopmental stratagies for modern agricultural logistics industry in Xi’an were studied based on system dynamics.[Method] By dint of system dynamics,reality analysis and relevant data were applied to support the exploration of each factor for the development of modern agricultural logistics industry.In the meantime,according to the concrete data,the systematic dynamics model was set up based on the third party logistics and Xi’an agricultural economy cooperation.In addition,each influencing factor was expounded.[Result] The agricultural production,logistics requirement and logistics supply in Xi’an City were increasing;the idea of reducing the cost through improving agricultural logistics requirement was not ideal;the increasing input to agricultural logistics can reduce cost and can promote the development of economy;the third party increasing investment can reduce cost and accelerate economic development.[Conclusion] It provided theoretical basis for the adjustment of economic structure. 展开更多
关键词 System dynamics xi'an agricultural logistics industry COUNTERMEASURES
下载PDF
Key Points in the Supervision of Road Landscaping Project——A Case Study of the South 3^(rd) Ring Road in Yanta District of Xi'an City,China 被引量:1
18
作者 弓弼 魏代谋 《Journal of Landscape Research》 2011年第6期71-74,共4页
Characteristics of road landscaping were analyzed,as a kind of "linear" landscaping,it could be classified into urban street landscaping,urban ring road and expressway landscaping.Differences between road la... Characteristics of road landscaping were analyzed,as a kind of "linear" landscaping,it could be classified into urban street landscaping,urban ring road and expressway landscaping.Differences between road landscaping projects and other garden landscaping projects or construction projects were analyzed.Landscaping project for the South 3rd Ring Road of Xi'an City(in Yanta District)was taken for an example to summarize construction experience,discuss present conditions and features of garden landscaping supervision in China.The artistic and physiological properties of garden landscaping,as well as the supervision during maintenance period were stressed,but it was also pointed out that garden landscaping supervision in China was actually not given sufficient attention.On this basis,key points in the supervision of road landscaping project were proposed:understanding design ideas,selection of landscape plants,quality control of concealed works,prevention and control of diseases and insects,construction safety management and overall image;only by effectively implementing these key points,a high-quality road landscaping project could be realized to improve the image of a city and beautify its environment. 展开更多
关键词 ROAD LANDSCAPING project Construction SUPERVISION The South 3rd RING ROAD of xi’an
下载PDF
A Tentative Study on the Combination of Site Protection and City Construction of Xi'an 被引量:1
19
作者 衣学慧 熊星 李朋飞 《Journal of Landscape Research》 2011年第7期36-38,41,共4页
The protection of relic sites helps determine the culture coordinate of a city or a region,and enhances its cultural image and status.Through analyzing the construction features and technical means of various ruins pa... The protection of relic sites helps determine the culture coordinate of a city or a region,and enhances its cultural image and status.Through analyzing the construction features and technical means of various ruins parks in Xi'an including Daming Palace National Heritage Park,Qujiangchi Ruins Park,Hanyao Ruins Park,Dacien Temple Ruins Park,Tang Dynasty City Wall Ruins Park,Emperor Qin Ⅱ Mausoleum Ruins Park and so on,a new model combining the site protection with city construction is presented.By integrating cultural relics preservation,heritage protection with innovation,a series of ruins parks processed with deep cultural connotation are constructed,which not only protects the relics and refreshes the city construction,but also well reflects the essence of traditional Chinese culture unique charm of ancient oriental civilization.The well combination of site protection and city construction improves the cultural image and status of the city,enhances the charm of public cultural space,promotes the development of heritage protection and secures more funds for urban and rural construction. 展开更多
关键词 xi’an CONSTRUCTION of ruins PARK HERITAGE protection City CONSTRUCTION
下载PDF
4种鬼针草与Xi莶草的TLC鉴别研究 被引量:3
20
作者 霍德兰 孙永法 《时珍国医国药》 CAS CSCD 1998年第4期335-335,共1页
利用TLC的方法对4种鬼针草及Xi莶草进行了鉴别研究,为它们的准确鉴别提供依据。
关键词 鬼针草 狼把草 xi莶草 薄层层析 鉴别
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部