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   174976篇
  免费   11102篇
  国内免费   1326篇
耳鼻咽喉   2538篇
儿科学   3221篇
妇产科学   3913篇
基础医学   26392篇
口腔科学   3719篇
临床医学   16314篇
内科学   33143篇
皮肤病学   4777篇
神经病学   13131篇
特种医学   8895篇
外科学   23624篇
综合类   2240篇
现状与发展   5篇
一般理论   84篇
预防医学   10418篇
眼科学   4638篇
药学   14898篇
中国医学   1717篇
肿瘤学   13737篇
  2023年   1078篇
  2022年   2992篇
  2021年   5252篇
  2020年   2700篇
  2019年   3904篇
  2018年   4763篇
  2017年   3530篇
  2016年   4562篇
  2015年   6171篇
  2014年   7583篇
  2013年   9127篇
  2012年   13747篇
  2011年   13376篇
  2010年   7866篇
  2009年   6643篇
  2008年   10039篇
  2007年   9843篇
  2006年   9040篇
  2005年   8553篇
  2004年   7621篇
  2003年   6621篇
  2002年   5781篇
  2001年   4730篇
  2000年   4327篇
  1999年   3523篇
  1998年   1422篇
  1997年   1072篇
  1996年   1012篇
  1995年   925篇
  1994年   793篇
  1993年   677篇
  1992年   1682篇
  1991年   1697篇
  1990年   1455篇
  1989年   1337篇
  1988年   1239篇
  1987年   1125篇
  1986年   1100篇
  1985年   964篇
  1984年   703篇
  1983年   618篇
  1982年   437篇
  1981年   412篇
  1980年   367篇
  1979年   567篇
  1978年   453篇
  1977年   430篇
  1976年   373篇
  1974年   388篇
  1973年   361篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
141.
S F Wainapel  L Lee  T L Riley 《Paraplegia》1986,24(2):123-126
We present the case of a spastic quadriplegic who developed mental symptoms which resolved when his Baclofen was discontinued. Of interest was the presence of EEG abnormalities similar to those described in cats receiving this drug. These abnormalities, previously unreported in humans, resolved upon discontinuing Baclofen therapy.  相似文献   
142.
143.
We report a case of an abdominal mass that had hemorrhaged spontaneously into the retroperitoneal space and presented as an acute abdominal catastrophe. The pathological diagnosis was pheochromocytoma, although the patient had no suggestive symptoms preoperatively. The management of this silent pheochromocytoma and its atypical presentation are discussed.  相似文献   
144.
During the first 24 months of the Oregon Liver Transplantation Program, which began in October 1988, 94 patients were formally evaluated and 47 adults underwent 54 liver transplantations. Thirty-four percent of patients were veterans. The recipient operation lasted a mean of 7.4 hours (range: 4 to 16 hours). Veno-venous bypass was used routinely at first but selectively later (7 of the last 26 cases), resulting in reduced operating time. Hepatic artery reconstruction was end-to-end anastomosis in 52 cases and iliac conduit in 2. No arterial thrombosis occurred. Biliary reconstruction was choledochocholedochostomy in 83% and choledochojejunostomy in 17%. Biliary complications occurred in 28%. Operative mortality was 2%, and 1-year actual survival was 80%. Patients with hepatitis B fared worse, with four of six dying at a mean of 7.6 months. Overall, the median hospital stay was 30 days. Patients surviving more than 3 months had a mean Karnofsky score of 82%. No significant difference in outcome was noted in patients receiving prophylactic OKT3 monoclonal antibody (used in 45%) versus conventional immunosuppressive therapy. Overall, allograft rejection occurred in 55% of patients. Retransplantation was required in seven patients, three for primary graft nonfunction, two for uncontrolled rejection during induction therapy with OKT3, and two for graft failure secondary to recurrent hepatitis B.  相似文献   
145.
We examined the localization of basic fibroblast growth factor (basic FGF) in the adult rat brain by immunohistochemical and Western blotting analysis using a specific antibody against a synthetic basic FGF fragment (N-terminal 12 residues). The antibody did not cross-react with acidic FGF. Basic FGF-like immunoreactivity was located exclusively in the neuronal elements and had very heterogenous distribution. Immunoreactive cell bodies were observed in the paraventricular, supraoptic and circular nuclei of the hypothalamus. Numerous immunoreactive neuronal processes originating from these basic FGF-positive cells extended lateroventrally and then caudally to the internal layer of the median eminence. In addition, the neurohypophysis contained a significant number of basic FGF-like immunoreactive fibers. Western-blotting analysis revealed that the hypothalamus and the hypophysis contained a main band of basic FGF immunoreactive with an apparent molecular weight of 17 kDa. These results show that the hypothalamo-hypophyseal neuroendocrine pathway contains basic FGF.  相似文献   
146.
147.
This research applied the life table technique to nursing personnel data in two types of hospitals to illustrate how administrators can examine patterns of continued employment. Although a large proportion of nurses were short-stay employees, the teaching hospital was found to have a higher retention rate than the community hospital corporation. The retention patterns are examined by personal and professional characteristics, as well as by reason for termination. Implications of our findings are discussed with respect to policy concerns related to hiring, retention, productivity, and staff development.  相似文献   
148.
A case of multicystic peritoneal mesothelioma in a 29 year old white male is reported. This is the second reported case of cystic peritoneal mesothelioma in a male and the first case of cystic mesothelioma reported in Australia. Clinical, histopathologic and ultrastructural findings are discussed together with a review of previous cases.  相似文献   
149.
A ureteral stent placed percutaneously through a nephrostomy can be readily exchanged endoscopically for a ureteral indwelling pigtail stent over a percutaneous guide wire. Percutaneous antegrade stent placement can sometimes be accomplished when retrograde placement cannot. We report 10 successful conversions to indwelling stent in 11 cases. In 1 case the percutaneous guide wire could not be retrieved endoscopically because of a bleeding tumor in the bladder. No serious difficulties or complications were encountered. The percutaneous approach offers an alternative method of providing internal urinary diversion if retrograde ureteral indwelling stent placement has failed.  相似文献   
150.
A patient with a free-floating ball thrombus in the left atrium complicating mitral stenosis is described. The pathological features and clinical implications are discussed.  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