首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   21969篇
  免费   1882篇
  国内免费   1737篇
耳鼻咽喉   157篇
儿科学   188篇
妇产科学   204篇
基础医学   2603篇
口腔科学   319篇
临床医学   3004篇
内科学   3305篇
皮肤病学   249篇
神经病学   1059篇
特种医学   752篇
外国民族医学   16篇
外科学   2200篇
综合类   3944篇
现状与发展   3篇
一般理论   1篇
预防医学   1264篇
眼科学   714篇
药学   2454篇
  23篇
中国医学   1152篇
肿瘤学   1977篇
  2024年   81篇
  2023年   375篇
  2022年   1024篇
  2021年   1168篇
  2020年   876篇
  2019年   681篇
  2018年   741篇
  2017年   751篇
  2016年   681篇
  2015年   1064篇
  2014年   1294篇
  2013年   1114篇
  2012年   1689篇
  2011年   1775篇
  2010年   1086篇
  2009年   814篇
  2008年   1128篇
  2007年   1090篇
  2006年   1146篇
  2005年   985篇
  2004年   737篇
  2003年   705篇
  2002年   616篇
  2001年   493篇
  2000年   569篇
  1999年   551篇
  1998年   371篇
  1997年   314篇
  1996年   228篇
  1995年   226篇
  1994年   217篇
  1993年   118篇
  1992年   146篇
  1991年   147篇
  1990年   93篇
  1989年   100篇
  1988年   81篇
  1987年   88篇
  1986年   65篇
  1985年   42篇
  1984年   42篇
  1983年   28篇
  1982年   19篇
  1981年   10篇
  1980年   7篇
  1979年   12篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
p16与C—myc在喉鳞状细胞癌中的表达意义   总被引:2,自引:0,他引:2  
目的:研究p16和C-myc在喉鳞状细胞癌中的表达意义。方法:应从p16和C-myc单克隆抗体,通过免疫组织化学法检测6例正常喉粘膜和47例喉鳞癌中p16和C-myc的表达。结果:6例正常喉粘膜组织中未发现p16和C-myc蛋白阳性表达,47例喉鳞癌中p16和C-myc阳性表达率分别为48.9%(23/47)和57.4%(27/47),与性别、年龄和肿瘤发生的部位无相关性(P>0.05),与临床分期和病理分级相关(P<0.05);C-myc还与颈淋巴结转移相关(P<0.05)。结论:p16和C-myc蛋白阳性表达在喉鳞癌的发生和发展中起重要作用,可作为评价喉鳞癌预后的新指标。  相似文献   
52.
鼻咽结核22例报告   总被引:1,自引:0,他引:1  
报告鼻咽结核22例,5例合并肺结核,16例合并颈淋巴结核。临床诊断注意与鼻咽癌鉴别。颈淋巴结FNA细胞学检查与PCR检测有助于诊断,确诊需病理学检查。全身抗痨治疗,同时应用5%链霉素局部灌洗,可显著提高疗效,缩短病程。对合并巨大的或全身用药不敏感的结核性颈淋巴结炎采取手术切除效果良好。  相似文献   
53.
1994年7月至1995年8月采用电化学治疗转移性体表肿瘤53例,其中颜面部2例,颈部32例,胸壁4例,腋窝6例,腰骶部1例,腹股沟8例。总有效率达92%。临床实践表明:电化学治疗体表肿瘤操作方便,安全有效,疗程短,损伤小,无任何并发症,尤其是对应用其他疗法无效的体表肿瘤仍有效。  相似文献   
54.
脑震荡患者在恢复期或伤后3个月内,头部仍有胀痛,搏动性疼痛,或有紧缩感,脑力劳动后多加重,常伴有头昏、脑晕、耳鸣、记忆力减退、失眠及植物神经功能紊乱等症状,为脑震荡后遗症。祖国医学认为,头为清阳之会,五脏精华之血、六腑清阳之气均上注于头。若头部受外伤则阻滞气血之运行,脑失其养或清阳遏阻则可出现上述症状。笔者近两年来用王不留行籽耳穴贴压治疗脑震荡后遗症20例,疗效满意,现报告如下。  相似文献   
55.
Adjuvant monoarthritis was induced by the injection of 50μl Complete Freund‘s Adjuvant(CFA) into ankle joint of adult SD rats. Electroacupuncture (EA)was performed on Huantiao (GB30)and Yanglingquan (GB 34) (0.5-1.5 v, 4-16 Hz, 30 min) after the injection.  相似文献   
56.
Zinc-positive neurons and terminals, known to be associated with the glutamatergic projections in the brain, can be demonstrated by the histochemical Timm method and later modifications thereof. The adult rat neocortex contain a uniform lamination of zinc-positive cells with specific projections to, e.g., the striatum. We have previously reported that fetal neocortical grafts implanted in the adult rat neocortex combined with rearing in an enriched environment can improve behavioral functions and reduce the secondary atrophy of thalamus after cortex infarction in adult rats. In order to examine whether the expression of zinc positivity is ontogenetically inherent to neocortical neurons we grafted fetal neocortical tissue to aspiration or ischemic lesions of the frontoparietal neocortex of adult rats, followed by histochemical visualization of the vesicular zinc pool by selenite or sulfide. One further aim of the study was to elucidate to what extent the distribution of zinc-containing neurons and terminals in the grafts depended on rearing under different environmental conditions. The foremost finding of the present study was that the overall density of zinc-containing terminals in fetal cortical transplants placed in brain infarcts of adult spontaneously hypertensive rats is higher when the rats are reared in an enriched environment. Moreover, the presence and expression of zinc-positive neurons and terminals do not seem to be ontogenetically inherent to the cortical neurons as the fetal neocortical grafts placed in aspiration lesions contained no zinc-selenide-positive neurons and few or no zinc-selenide-positive terminals. The presence or expression of zinc-positive cells may thus be induced by ingrowth of fibers and terminals from the host brain as transplants placed in the ischemic lesions expressed both zinc-positive neurons and terminals.  相似文献   
57.
OBJECTIVE: To examine the expression of apoptosis-related genes c-IAP2 and caspase-4 in sinonasal squamous carcinoma. To investigate the role and mechanism of the two apoptosis-related genes in nasal cavity and sinus squamons carcinoma. METHODS: Forty-one pathologically confirmed specimens of nasal cavity and sinus squamons carcinoma were subjected for immunohistochemical staining to analyze the expression of c-IAP2 and caspase-4, in addition 10 normal nasal mucosa were used as control. RESULTS: The positive rate of c-IAP2 in sinonasal squamons carcinoma was 87.8%, among which 14 cases were strongly stained(+ + +), 15 cases were stained(+ +), 7 cases were stained (+), only 5 cases were negative. In 10 normal control tissues, no case was stained(+ + +), 2 cases were stained (+ +), 3 cases were stained(+), the other 5 cases were negative. Higher level expression of c-IAP2 protein was detected more often in squamons carcinoma specimens than that in normal nasal mucosa. There was statistically significant difference between the two groups for the staining(P < 0.05). The expression of c-IAP2 was not correlated with clinical staging (P > 0.05), but there were positive correlation with clinical prognosis (P < 0.01) and pathological classification (P < 0.01); The positive rate of caspase-4 in nasal cavity and sinus squamons carcinoma was 58.5%, among which 4 cases were strongly stained (+ + +), 7 cases were stained (+ +), 13 case was stained(+), 17 cases were negative. The expression of caspase-4 protein was more deletion in squamons carcinoma specimens than that in control group, there was statistically significant difference between the two groups for the staining (P < 0.05). The expression of caspase-4 protein was negatively correlated with clinical prognosis (P < 0.01) and pathological classification ( P < 0.01), not correlated with clinical staging(P > 0.05). The expression of c-IAP2 was negativelly correlated with the experssion of caspase-4. CONCLUSIONS: The results indicates that in sinonasal squamous carcinoma, c-IAP2 is activated, while caspase-4 is restrained, the signal transduction pathway of apoptosis is arrested, leading to surviving of tumor cells, this maybe directly associated with the development of sinonasal squamons carcinoma, and with the failure of tumor trentment.  相似文献   
58.
儿童频繁性眨眼101例的矫治效果   总被引:1,自引:0,他引:1  
目的:观察分析综合疗法矫治儿童频繁眨眼的疗效。方法:采用心理疗法、药物、手术等去除病因后,均给以针灸等综合疗法,治疗频繁眨眼患儿101例(202眼)。结果:在去除病因后均在心理治疗的诱导下,针刺新明II、攒竹、四白穴,针刺2次频繁眨眼症状消失者68例(67.3%),5次治愈者31例(30.6%),10次治愈者2例(1.4%)。结论:综合疗法是矫治儿童频繁眨眼的有效方法。  相似文献   
59.
目的 通过对一青少年遗传性白内障家系发病患者γD基因的分析,探讨该基因变异在白内障发病中的作用。方法 运用基凶扩增、克隆、变异分析的方法,研究该家族中不同患者γD基因的变异情况。结果 同一家族中5例患者出现3种不同核苷酸变异,个别核苷酸的突变并未引起编码氨基酸的改变。结论 同一家族不同自内障患者出现不同的γD基因变异现象为研究青少年遗传性白内障发病的分子机制提供了理论依据。  相似文献   
60.
目的了解樟木口岸经过传染病预防知识的宣传后传染病感染情况,为制定下一步的防制计划提供依据.方法采集所监测人员血清样本,进行乙肝、梅毒、HIV抗体检测.结果2002年278名体检人员检出阳性结果33例,总检出率11.87%.各类传染病的检出百分比为:乙肝7.19%、梅毒4.32%、HIV抗体0.36%.2003年339名体检人员检出阳性结果24例,总检出率7.08%.各类传染病的检出百分比为:乙肝3.24%、梅毒3.83%、HIV抗体0.结论经过传染病预防知识的宣传,各类传染病感染皆有所下降.传染病的传播可以通过加大宣传力度得到有效控制.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号