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   36464篇
  免费   2299篇
  国内免费   1019篇
耳鼻咽喉   259篇
儿科学   403篇
妇产科学   427篇
基础医学   1910篇
口腔科学   423篇
临床医学   4719篇
内科学   2788篇
皮肤病学   159篇
神经病学   1180篇
特种医学   1874篇
外国民族医学   7篇
外科学   8174篇
综合类   8328篇
现状与发展   1篇
预防医学   2641篇
眼科学   653篇
药学   3909篇
  67篇
中国医学   887篇
肿瘤学   973篇
  2024年   82篇
  2023年   514篇
  2022年   977篇
  2021年   1217篇
  2020年   1208篇
  2019年   978篇
  2018年   1004篇
  2017年   1186篇
  2016年   1264篇
  2015年   1232篇
  2014年   2684篇
  2013年   2356篇
  2012年   2619篇
  2011年   2690篇
  2010年   2135篇
  2009年   1899篇
  2008年   1816篇
  2007年   1862篇
  2006年   1689篇
  2005年   1489篇
  2004年   1126篇
  2003年   960篇
  2002年   867篇
  2001年   730篇
  2000年   639篇
  1999年   551篇
  1998年   461篇
  1997年   426篇
  1996年   373篇
  1995年   345篇
  1994年   270篇
  1993年   241篇
  1992年   192篇
  1991年   200篇
  1990年   160篇
  1989年   168篇
  1988年   164篇
  1987年   155篇
  1986年   119篇
  1985年   128篇
  1984年   110篇
  1983年   82篇
  1982年   79篇
  1981年   73篇
  1980年   71篇
  1979年   45篇
  1978年   31篇
  1977年   37篇
  1976年   25篇
  1974年   18篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
目的 观察中药高臀位灌肠治疗慢性肾功能衰竭(chronic renal failure,CRF)的临床疗效.方法 将100例CRF患者随机分为两组,治疗组70例采用中药高臀化灌肠治疗,对照组30例口服活性炭治疗.结果 治疗组总有效率为88.6%,对照组总有效率为50.0%.结论 中药高臀位灌肠治疗CRF有效.  相似文献   
22.
Congenital thoracic ectopic kidney is a very rare developmental anomaly and the rarest form of all ectopic kidneys. It is usually asymptomatic and discovered incidentally on routine chest radiography. Herein we reported the first case of staghorn stone in a thoracic kidney managed successfully by percutaneous nephrolithotomy.  相似文献   
23.
胸部类癌   总被引:2,自引:0,他引:2  
本文报道了31例胸部类癌,其中胸腺类癌14例,支气管类癌17例,伴有异位ACTH综合征者17例。12例患者发生转移(39%),24例行原发肿瘤全部或部分切除,术后放疗或化疗或两者均有者17例,4例仅行探查并取活检,28例经手术及病理证实。  相似文献   
24.
Summary This report deals with a case of rhabdomyosarcoma in the upper thoracic spine. It is of particular interest, not only for the rarity of type and location of this tumour, but for its clinical course, which presented fluctuations of neurological status, included an acute demonstration of complete paraplegia followed by full recovery after conservative treatment, and gradual relapsing of neurological deficit, one year later.  相似文献   
25.
Lymphocytes continuously migrate through the body, and their efficient extravasation from the blood via high endothelial venules (HEV) is essential for initiating an appropriate immune response. Most investigations have focused on the lymphocyte/HEV interaction in vitro. However, to what extent such systems reflect the situation in vivo is not known. It is also unclear whether lymphocyte subsets immigrate into the HEV in proportion to their presence in the blood, and whether import capacity is limited by the HEV. When rat mesenteric lymph node lymphocytes were incubated in vitro on cryostat sections, the well-known preferential binding of B lymphocytes to HEV of Peyer's patches (PP) and T cells to HEV of axillary lymph nodes (axLN) was observed (axLN vs. PP: B lymphocytes 21.2 ± 5.0% vs. 40.6 ± 11.0%, T lymphocytes 84.6 ± 6.3% vs. 56.5 ± 12.9%). However, when labeled mesenteric lymph node lymphocytes were injected and their location within the HEV was analyzed 15 min later, no preferential interaction was seen. After injection of labeled thoracic duct lymphocytes, the percentage of labeled cells among B and T lymphocytes in the blood was significantly different (4.4 ± 0.9% vs. 8.9 ± 3.6%), whereas that in HEV of axLN (19.0 ± 6.4% vs. 16.6 ± 6.0%) and PP (30.6 ± 6.1% vs. 33.9 ± 4.4%) was comparable. Although the number of injected lymphocytes was similar in magnitude to the total blood lymphocyte pool, after injection there was no increase in lymphocyte numbers in the HEV. Thus, the adhesion assay in vitro does not completely reflect immigration into HEV in vivo. In addition, our data suggest that both the availability of lymphocyte subsets in small venules and the immigration rate into HEV are actively regulated in vivo.  相似文献   
26.
Diagnosis and treatment of thoracic outlet syndrome   总被引:2,自引:0,他引:2  
Patients who develop symptoms of thoracic outlet syndrome (TOS) have a predisposing anatomic abnormality. In most patients with TOS, the symptoms are caused by entrapment of the brachial plexus and they do not arise from compression of the subclavian artery, as was previously thought. The tests advocated for diagnosing this common syndrome (i.e., evaluating the positional compression of the artery when the arms are raised, the neck is turned, or the shoulders are braced) cannot accurately diagnose this syndrome. There are two reasons for this. The symptoms of TOS are not related to the compression of the artery in the outlet in 98% of patients, and 75% of normal individuals without symptoms show diminished radial pulse on various provocation tests. We employed four timed provocation tests (minute tests) to diagnose TOS: the timed Morley test, timed Wright test, timed Eden test, and elevated arm stress exercise, all of which are very sensitive. In normal individuals without symptoms, 20% experience transitional symptoms such as slight pain and tiredness, on these tests indicating a subclinical state. TOS is treated by keeping the thoracic outlet wide, this being done either conservatively or surgically. In 1993 and 1994, we conservatively treated 418 of 422 patients with TOS by means of active exercise, a brace, and by block therapy. These measures did not reduce the symptoms in 23 of these patients, so surgical treatment was indicated. In the remaining 4 of the 422 patients, conservative treatment was not indicated and surgery was performed directly. All the patients showed significant clinical improvement of varying degree. Presented at the 69th Annual Meeting of the Japanese Orthopaedic Association, Tokyo, April 12, 1996  相似文献   
27.
Ambulatory surgery has become routine for many plastic surgery procedures. Anesthesia techniques including general anesthesia by inhalation and intravenous infusion and the dissociative technique have all been used successfully for outpatient anesthesia. Propofol (Diprivan), a relatively new agent, has proven to be a safe and effective general anesthesia agent for outpatient surgery. We report on our experience with propofol as an induction agent and continuous drip for general anesthesia maintenance in 100 consecutive outpatient, plastic surgery procedures performed in an office facility. Assessment factors were recovery-room time, nausea and vomiting in the recovery room and at home, hallucinations, patients' recollection of anesthesia experience, and overall patient satisfaction.  相似文献   
28.
We describe a patient in whom long-term monoamine oxidase (MAO) inhibitor therapy was discontinued 20 days before surgery with general anesthesia. This patient developed severe perioperative hypotension after administration of 10 mg of bupivacaine through an epidural catheter, which was corrected only after potent vasopressor therapy. We attribute this hemodynamic instability to attenuation of this patient's sympathetic tone based on several mechanisms: (1) residual effect of long-term administration of MAO inhibitor that caused a decrease in the number of β-adrenergic receptors (adrenergic subsensitivity due to receptor down-regulation), (2) recovered MAO activity causing effective degradation of sympathetic amines, and (3) combined attenuating effects of general and epidural anesthesia on sympathetic tone.  相似文献   
29.
局麻胸腔镜清创术治疗脓胸实用性研究   总被引:1,自引:0,他引:1  
目的探讨脓胸患者经局麻胸腔镜清创术治疗的实用价值。方法在局麻下用硬质电视胸腔镜行脓胸清创术,介绍操作方法及清创步骤,观察患者的耐受性及疗效。结果总有效率为90.6%,早、中、晚期治疗有效率分别是100.0%、90.9%、50.0%。术中监测患者对操作的反应及血氧饱和度、呼吸、脉搏、心电图改变均无统计学意义。结论局麻胸腔镜清创术在患者清醒状态下操作,除抽净黏稠脓液外尚可取出团块状脓苔及坏死组织,打穿包裹性脓腔,充分冲洗,可迅速控制感染。方法简单,避免全麻气管插管带来的并发症,术后恢复快,适应证广,患者易耐受,是治疗脓胸的实用方法。  相似文献   
30.
目的观察低浓度小剂量利多卡因在肛门病手术中的应用效果。方法选择接受肛门病手术者100例,手术时用0.25%盐酸利多卡因5-20ml,根据病情和手术需要作局部浸润麻醉。结果通过100例的肛门手术观察,结果显示麻醉满意顺利83例,麻醉良好17例,无1例麻醉无效失败。总有效率100%。此法麻醉效果确切,未发现严重不良反应。结论此法具有易于掌握,效果好而安全的优越性,适于临床应用和推广。  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