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   235584篇
  免费   18792篇
  国内免费   7629篇
耳鼻咽喉   1298篇
儿科学   7889篇
妇产科学   2373篇
基础医学   20755篇
口腔科学   3934篇
临床医学   25066篇
内科学   57277篇
皮肤病学   3011篇
神经病学   27087篇
特种医学   6733篇
外国民族医学   6篇
外科学   19222篇
综合类   32404篇
现状与发展   32篇
一般理论   9篇
预防医学   19344篇
眼科学   2590篇
药学   17068篇
  210篇
中国医学   11286篇
肿瘤学   4411篇
  2024年   781篇
  2023年   5085篇
  2022年   9087篇
  2021年   12885篇
  2020年   12140篇
  2019年   9231篇
  2018年   9059篇
  2017年   9077篇
  2016年   9288篇
  2015年   8964篇
  2014年   16556篇
  2013年   18098篇
  2012年   13540篇
  2011年   14640篇
  2010年   11541篇
  2009年   11070篇
  2008年   11062篇
  2007年   10729篇
  2006年   9562篇
  2005年   7866篇
  2004年   6723篇
  2003年   5769篇
  2002年   4839篇
  2001年   4202篇
  2000年   3480篇
  1999年   2946篇
  1998年   2825篇
  1997年   2484篇
  1996年   2231篇
  1995年   1981篇
  1994年   1828篇
  1993年   1551篇
  1992年   1494篇
  1991年   1321篇
  1990年   1049篇
  1989年   891篇
  1988年   827篇
  1987年   753篇
  1986年   655篇
  1985年   764篇
  1984年   635篇
  1983年   393篇
  1982年   459篇
  1981年   385篇
  1980年   292篇
  1979年   252篇
  1978年   187篇
  1977年   164篇
  1976年   138篇
  1975年   50篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
The requirement for endoscopic access to a stricture is a major limitation of the endoscopic dilatation for the treatment of strictures in the gastrointestinal tract. We have developed the double‐balloon enteroscopy method that enables visualization of the entire small bowel. In addition, double‐balloon enteroscopy has a potential for the interventional therapy including dilatation of strictures. We present here a case of jejunal strictures in a 47‐year‐old woman with Crohn's disease successfully treated with a balloon catheter in combination with double‐balloon enteroscopy. Balloon dilation with double‐balloon enteroscopy is a promising method for the treatment of small bowel strictures in Crohn's disease.  相似文献   
102.
2008年连云港市“手足口病”流行特征及病原学分型   总被引:1,自引:0,他引:1  
宋华 《职业与健康》2010,26(2):191-193
目的分析连云港市2008年手足口病的流行特征及病原学分型情况。方法应用流行病学方法对2008年该市的手足口病流行资料进行分析。结果依据疫情报告,实验室诊断病例45例,其中CoxA1638例,EV71型7例,其他肠道病毒0例。2008年该市临床报告手足口病例1067例,报告发病率为23.19/10万,比2007年上升442.34%,男女发病比为3.1∶1。发病年龄最小的为0岁组,最大的为8岁;0~5岁组,共计发病976例,占总发数的91.47%。发病数的构成以散居儿童最多,占76.66%。地区分布:全市各个区县均有手足口病病例报告,但城区的总体发病率高于县。结论连云港市手足口病发病率有上升趋势;控制传染源是有效防止该病流行的关键。  相似文献   
103.
目的探讨结节性甲状腺肿合并其他甲状腺疾病的临床特点。方法回顾性分析我院手术治疗的4622例结节性甲状腺肿中并存其他甲状腺疾病的临床资料。结果4622例结节性甲状腺肿中700例合并其他甲状腺疾病,1418例存在不同的诊断失误。结论在诊断结节性甲状腺肿的同时应注意其合并的其他甲状腺疾病。  相似文献   
104.
105.
Gastroesophageal reflux disease (GERD) is a common disease and can be successfully treated by laparoscopic fundoplication. This article describes the technique of laparoscopic surgery for GERD with a focus on operative pitfalls.  相似文献   
106.
OBJECTIVE: This study was designed to determine the relationship between interstitial cystitis (IC), endometriosis (endo), and chronic pelvic pain (CPP) in individuals in whom nongynecological and nonurological problems had been previously ruled out. METHODS: A prospective study of 162 consecutive women with a complaint of chronic pelvic pain seen in the clinic was performed between August 2002 and December 2005. These patients underwent a workup to exclude other causes of pelvic pain, had PUF (Pain Urgency and Frequency) questionnaires filled out, and underwent a laparoscopy and a cystoscopy with hydrodistention. Pain levels were determined, and treatment was reviewed and enumerated. Results were obtained and quantified. RESULTS: In this study, 123 (76%) patients were diagnosed with active endometriosis, 133 (82%) were diagnosed with interstitial cystitis, and 107 (66%) had both disease entities simultaneously. Thirteen (8%) patients were diagnosed with pathologies unrelated to endometriosis and interstitial cystitis. Pain levels were seen to decrease at 6 months in all groups of patients with the exception of those patients with endometriosis only. CONCLUSION: CPP is a difficult, taxing, and frustrating concern for many women in the United States. These individuals have traditionally been difficult to treat. A large number of women with CPP in our patient population have been shown to have endometriosis, interstitial cystitis, or both. Therefore, a workup for premenopausal individuals with CPP involves obtaining a history that keys into possible nongynecologic causes of pain, a complete accounting of urinary problems, and a thorough history of gynecological problems. A physical examination with a comprehensive history should be performed, and the investigation may include the possibility of a simultaneous laparoscopy and cystoscopy if warranted. These procedures can serve as both a means for diagnosis and treatment of these problems when encountered.  相似文献   
107.
Flavocoxid (Limbrel), a proprietary mixture of flavonoid molecules (baicalin and catechin), was tested against a traditional nonsteroidal anti-inflammatory drug, naproxen, for the management of the signs and symptoms of moderate osteoarthritis (OA) in humans. Discomfort and global disease activity were used as the primary end points, and safety assessments were also taken for both treatments as a secondary endpoint. In this double-blind study, 103 subjects were randomly assigned to receive either flavocoxid [500 mg twice daily (BID)] or naproxen (500 mg BID) in a 1-month onset of action trial. Outcome measures included the short Western Ontario and McMaster University Osteoarthritis Index, subject Visual Analogue Scale for discomfort and global response, and investigator Visual Analogue Scale for global response and fecal occult blood. Both flavocoxid and naproxen showed significant reduction in the signs and symptoms of knee OA (P ≤ .001). There were no statistically detectable differences between the flavocoxid and naproxen groups with respect to any of the outcome variables. Similarly, there were no statistically detectable differences between the groups with respect to any adverse event, although there was a trend toward a higher incidence of edema and nonspecific musculoskeletal discomfort in the naproxen group. In this short-term pilot study, flavocoxid was as effective as naproxen in controlling the signs and symptoms of OA of the knee and would present a safe and effective option for those individuals on traditional nonsteroidal anti-inflammatory drugs or cyclooxygenase-2 inhibitors. A low incidence of adverse events was reported for both groups.  相似文献   
108.
背景:Nissen胃底折叠术(Nissen fundoplication,NF)已不是治疗胃食管返流性疾病(gastroesophageal reflux disease,GERD)的唯一、有效的方法。对于能降低胃酸的手术方式来讲,如高选择性迷走神经切断术(highly selective vagotomy,HSV),也不仅仅是一种辅助治疗方法。对高选择性迷走神经切断术联合Nissen胃底折叠术(Nissen fundoplication with highly selective vagotomy,NFHSV)治疗GERD的作用目前尚无完整的评价。方法:2003年6月~2005年6月8例女性病人接受NFHSV,8例均有6个月GERD病史,经药物治疗症状无缓解,有餐前痛、消化性溃疡或严重的胃炎。平均随访时间12个月,术前、术后进行烧心严重程度评分测定(heart burn severity score,HSS)。结果:平均手术时间110min,无手术并发症。1例术后须用质子泵抑制剂,术后经戒烟5个月后停药。8例术后症状和烧心严重程度评分测定有明显改善。结论:NFHSV是有效的联合手术方式,尚需要进一步的研究证实这一联合术式的完全有效性和安全性。  相似文献   
109.
Intravenous ganciclovir is the standard treatment for cytomegalovirus disease in solid organ transplant recipients. Oral valganciclovir is a more convenient alternative. In a randomized, international trial, recipients with cytomegalovirus disease were treated with either 900 mg oral valganciclovir or 5 mg/kg i.v. ganciclovir twice daily for 21 days, followed by 900 mg daily valganciclovir for 28 days. A total of 321 patients were evaluated (valganciclovir [n = 164]; i.v. ganciclovir [n = 157]). The success rate of viremia eradication at Day 21 was 45.1% for valganciclovir and 48.4% for ganciclovir (95% CI -14.0% to +8.0%), and at Day 49; 67.1% and 70.1%, respectively (p = NS). Treatment success, as assessed by investigators, was 77.4% versus 80.3% at Day 21 and 85.4% versus 84.1% at Day 49 (p = NS). Baseline viral loads were not different between groups and decreased exponentially with similar half-lives and median time to eradication (21 vs. 19 days, p = 0.076). Side-effects and discontinuations of assigned treatment (18 of 321 patients) were comparable. Oral valganciclovir shows comparable safety and is not inferior to i.v. ganciclovir for treatment of cytomegalovirus disease in organ transplant recipients and provides a simpler treatment strategy, but care should be taken in extrapolating to organ transplant recipients not properly represented in the present study.  相似文献   
110.
冠状动脉搭桥术193例经验总结   总被引:2,自引:0,他引:2  
目的:探讨冠状动脉搭桥术的病例选择、手术方法和治疗效果。方法:回顾性分析1997年1月~至2003年12月齐鲁医院施行的体外循环下冠状动脉搭桥术穴CPBCABG雪99例,非体外循环冠状动脉搭桥术穴OPCABG雪74例,冠状动脉搭桥加瓣膜置换术穴CABG VP雪20例的临床资料。结果:手术死亡6例,死亡率3.1%。体外循环下单纯冠状动脉搭桥术死亡率为2%,非体外循环冠状动脉搭桥术死亡率为2.7%,冠状动脉搭桥加瓣膜置换术死亡率为10%。短期随访3~6个月,症状消失占93.0%,症状明显减轻占5.4%。结论:患者近期随访效果良好,3组的手术死亡率差异无统计学意义穴P>0.05雪。  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