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   106820篇
  免费   10907篇
  国内免费   7851篇
耳鼻咽喉   901篇
儿科学   1773篇
妇产科学   1181篇
基础医学   10601篇
口腔科学   1853篇
临床医学   14360篇
内科学   14143篇
皮肤病学   971篇
神经病学   4713篇
特种医学   3558篇
外国民族医学   54篇
外科学   9165篇
综合类   21790篇
现状与发展   24篇
一般理论   9篇
预防医学   8972篇
眼科学   2542篇
药学   12908篇
  118篇
中国医学   7948篇
肿瘤学   7994篇
  2024年   460篇
  2023年   1722篇
  2022年   4491篇
  2021年   5606篇
  2020年   4468篇
  2019年   3486篇
  2018年   3612篇
  2017年   3685篇
  2016年   3341篇
  2015年   5262篇
  2014年   6304篇
  2013年   6017篇
  2012年   8956篇
  2011年   9597篇
  2010年   6888篇
  2009年   5752篇
  2008年   6479篇
  2007年   6009篇
  2006年   5622篇
  2005年   5006篇
  2004年   3526篇
  2003年   3225篇
  2002年   2630篇
  2001年   2151篇
  2000年   1929篇
  1999年   1864篇
  1998年   1093篇
  1997年   1076篇
  1996年   811篇
  1995年   755篇
  1994年   605篇
  1993年   391篇
  1992年   472篇
  1991年   404篇
  1990年   321篇
  1989年   286篇
  1988年   256篇
  1987年   253篇
  1986年   174篇
  1985年   144篇
  1984年   91篇
  1983年   61篇
  1982年   45篇
  1981年   46篇
  1980年   30篇
  1979年   34篇
  1978年   34篇
  1977年   18篇
  1976年   13篇
  1974年   14篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
191.
目的:研究外伤性脾切除术后中医辨证与免疫功能变化的关系.方法:选择15例脾切除和15例非脾切除患者作为观察对象,以其症状、舌苔、脉象及免疫功能的测定作为观察指标,观察其中医辨证与免疫功能变化.结果:脾切除组在术后早期可出现脾胃虚弱的证候群,同时免疫功能测定补体C3、免疫球蛋白IgG、免疫球蛋白IgM的水平明显降低,与非脾切除组有显著性差异.结论:脾切除容易造成患者术后出现的脾胃虚弱症候群,并降低患者的免疫功能.  相似文献   
192.
闭孔疝的诊断和治疗   总被引:5,自引:0,他引:5  
目的探讨闭孔疝的诊治方法。方法对15例闭孔疝病例诊治经过结合相关文献进行回顾性分析。结果15例中.术前确诊率仅20%(3/15),误诊率80%(12/15),全组均行疝环修补术,采用剖腹探查切口。本组治愈率100%,术后切口感染及愈合不良4例(21.67%),随访8例至今无复发。结论术前易误诊、漏诊;对年老体弱、多胎生育伴有不明原因肠梗阻表现的妇女,应高度考虑闭孔疝,Howship—Romberg征及Hannington—Kiff征阳性可确诊。疝环修补术是惟一有效的方法,首选腹腔内入路。早确诊.及时手术是减少并发症、降低死亡率的关键。  相似文献   
193.
方方 《健康世界》2005,(12):88-89
有些事情是一生难忘的:你的第一份薪水,终于拥了梦寐以求的爱车,还有那个绝妙的激情夜晚……难忘时刻已经成为过往,当你渴望再造那一激情澎湃的珍贵氛围时,听听她们的“珍藏”,给你的“性”福生活充充电吧。[编者按]  相似文献   
194.
BACKGROUND: During formation of prolactin neoplasia, how cells and its structure in adenohypophysis affect prolactin cells should be further studied. Intermediate lobe can be regarded as a driving region to release prolactin (PRL) and may promote formation of prolactin neoplasia in pituitary anterior lobe. OBJECTIVE: To observe the effect of diethylstilbestrol (DES) on the expressions of μ and m-calpains in pituitary intermediate lobe of female Wistar rats. DESIGN: Observational contrast animal study. SETTING: Beijing Neurosurgical Institute. MATERIALS: A total of 21 female Wistar rats, 3 weeks old weighing 70–80 g were housed with free access to tap water and standard pellet food. They were kept in a CL-grade condition, at (24±1)℃ and a humidity of (55±5)%, and with a 12 hours day-night cycle. Caprine anti-μ- and m-calpains antibodies were provided by Santa Cruz Biotechnology, CA, USA; rabbit-anti-PRL antibodies by Dako, Denmark; rabbit-anti-ACTH antibody by Boster Company, Wuhan. METHODS: The experiment was carried out in Pathophysiological Department and Animal Laboratory, Beijing Neurosurgical Institute from August 2006 to January 2007. ① Rats were randomly divided into groups with 7 in each group, including vehicle control group, in which rats were injected intraperitoneally with sun-flower seed oil (1 mL/kg, twice a week) for 16 weeks; DES group, where animals were administered with DES (5 mg/kg, twice a week) for 16 weeks; DES + vehicle control group, in which DES was administered for 12 weeks at the same dose with those in DES group, and then was discontinued and replaced by sun-flower seed oil (1 mL/kg, twice a week) for the following 4 weeks. ② At 16 weeks later, pituitary tissue was dealt with HE staining and PRL immunohistochemical examination to observe evoke of tumor; meanwhile, immunohistochemical examination was used to observe expression of PRL of pituitary anterior lobe, expressions of μ- and m-calpains of pituitary intermediate lobe and distribution of adrenocorticotropin. MAIN OUTCOME MEASURES: ① Expression of PRL of pituitary anterior lobe, expressions of μ- and m-calpains of pituitary intermediate lobe and distribution of adrenocorticotropin. ② Morphological observation of pituitary tissue. RESULTS: All 21 rats were involved in the final analysis. ① Results of immunohistochemical examination: Morphological changes of neoplasia in DES group were strongly positive to PRL, and this suggested that formation of prolactin adenoma was observed in pituitary tissue. As compared with vehicle control group, expression of adrenoeorticotropic hormone (ACTH) was increased in both DES group and DES + vehicle control group. In addition, expressions of μ- and m-calpains in pituitary intermediate lobe were higher in DES group than that in vehicle control group. Otherwise, expressions of m-calpains in pituitary intermediate lobe was decreased in DES + vehicle control group, but expression of μ-calpains was still increased. ② Morphological observation of pituitary tissue: Gland tubes were orderly arranged in rats in vehicle control group. Anterior pituitary gland in rats of DES group demonstrated an apparent disappearance of gland tubes and a relatively large-scaled vasculature formation, namely the vascular lake lined by tightly arranged endothelial cells. Local integrated tumor cell arrangements were also detected. In addition, the border between the IL and the anterior lobe was locally blurred. The definite tumor-like changes in pituitary tissues were confirmed in 6 of 7 female Wistar rats in DES group, and one spontaneous occurrence of tumor formation was found in vehicle control group. In DES + vehicle control group, DES withdrawal led to the subtile emergence of gland tube cavity, although tumor-like cells still existed in 4 of 7 rats, suggesting occurrence of the tumor regression due to the withdrawal of DES. CONCLUSION: A long-term application of DES can enhance the expressions of ubiquitours neutral cysteine protease in pituitary intermediate lobe and this suggests that both of them play a key role in release of hormone and formation of prolactin neoplasia through directly promoting PRL expression and release of neighboring pituitary intermediate lobe.  相似文献   
195.

Objective  

To observe and evaluate the value of utilizing selective internal iliac artery infusion and selective internal iliac artery embolization for the treatment of unremitting gross hematuria of stage T4 bladder carcinoma.  相似文献   
196.
肿瘤物理治疗技术及设备   总被引:1,自引:0,他引:1  
简要介绍了肿瘤的放射治疗和热治疗的技术及设备,介绍了各种技术及设备的特点。  相似文献   
197.
冠心病指南中有关心电图的解读   总被引:2,自引:1,他引:1  
有关冠心病的国际指南主要有5个:①ACC/AHA处理ST段抬高型心肌梗死指南(1999年第1版,2004年修改);②ACC/AHA处理不稳定型心绞痛和非ST段抬高型心肌梗死指南(2000年第1版,2002年第2版,2007年再修改);③ACC/AHA的处理慢性稳定型心绞痛指南(1999年第1版,2002年修改);  相似文献   
198.
浙江医科大学附二院门诊处方中精神药物使用调查   总被引:1,自引:0,他引:1  
本文对浙江医科大学附属二院1993年7月间31378张合格处方进行统计分析,并用限定日剂量(DDD)和药物使用指数(DUI)为指标,分析镇静催眠药物使用情况。结果表明苯二氮 类药方2067张,占总处方量的6.59%,巴比妥类药方49张,占0.16%,麻醉药方111张;占0.35%。苯二氮 类药方中.女性处方量1202张,男性处方量865张,男、女组间比较有显著性差异。苯二氮 类药方多分布在神经内科,常用的药有舒乐安定和阿普唑仑。九种常用的苯二氮 类药和麻醉性镇痛药的DUI均小于1。提示药物滥用现象少见,该院对这类药物的管理比较严格。麻醉性镇痛药中二氢埃托啡处方占67.57%。  相似文献   
199.
Summary Based on the gate-related receptor hypothesis, an analysis of kinetics of AN-132, a new antiarrhythmic agent, blockade of cardiac sodium channels and the gate-related receptor which is bound by the drug was performed by computer simulation. Model-predicted apparent rates of onset of AN-132 (30 μmol/L) blocking were 0.051, 0.038, and 0.034 AF−1 at stimulation frequencies of 1.0, 2.0 and 3.0 Hz, respectively. The time constant of recovery from block by AN-132 at resting potential -90 mV was 39.5 s. These findings are in agreement with those experimental data documented. The analysis of gate-related receptor shows that AN-132 binds the inactivation gate-related receptor, and the binding and unbinding are modulated by the inactivation process.  相似文献   
200.
吸附澄清法在中药水提液澄清中的应用研究   总被引:30,自引:1,他引:29  
杜成安  严襄陵 《中成药》1993,15(11):2-5
采用吸附澄清法使中药水提液澄清,从工艺稳定性,成分分析,药效学实验及效益分析四方面分析了两种工艺,吸附澄清法同水提醇沉法相比,能更有效地保留中药总固体物含量及有效成分,提高制剂成品的内在质量;成品稳定性好;成本低;生产周期短;劳动强度低,可望产生良好的社会经济效益。  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