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   34814篇
  免费   2727篇
  国内免费   95篇
耳鼻咽喉   333篇
儿科学   1041篇
妇产科学   901篇
基础医学   5337篇
口腔科学   472篇
临床医学   4988篇
内科学   6143篇
皮肤病学   700篇
神经病学   3924篇
特种医学   806篇
外科学   3177篇
综合类   277篇
现状与发展   1篇
一般理论   33篇
预防医学   3701篇
眼科学   604篇
药学   2282篇
中国医学   42篇
肿瘤学   2874篇
  2024年   20篇
  2023年   254篇
  2022年   365篇
  2021年   891篇
  2020年   594篇
  2019年   926篇
  2018年   1102篇
  2017年   857篇
  2016年   942篇
  2015年   972篇
  2014年   1373篇
  2013年   1774篇
  2012年   2800篇
  2011年   2887篇
  2010年   1562篇
  2009年   1419篇
  2008年   2427篇
  2007年   2500篇
  2006年   2257篇
  2005年   2352篇
  2004年   2095篇
  2003年   1954篇
  2002年   1833篇
  2001年   244篇
  2000年   137篇
  1999年   288篇
  1998年   391篇
  1997年   321篇
  1996年   236篇
  1995年   238篇
  1994年   191篇
  1993年   178篇
  1992年   120篇
  1991年   108篇
  1990年   89篇
  1989年   96篇
  1988年   79篇
  1987年   68篇
  1986年   59篇
  1985年   50篇
  1984年   72篇
  1983年   52篇
  1982年   60篇
  1981年   66篇
  1980年   66篇
  1979年   31篇
  1978年   30篇
  1977年   37篇
  1976年   30篇
  1974年   24篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
OBJECTIVE: Health systems throughout much of the world have been subject to 'reform' in recent years as countries have attempted to contain the rapidly rising costs of health care. Changes to hospital structures (restructuring) have been an important part of these reforms. A significant impact of current approaches to restructuring is the loss of, or changes to, nursing management roles and functions. SETTING: Australian hospitals PRIMARY ARGUMENT: Little evaluation has been undertaken to determine the impact of hospital structure and organisational restructuring on the nursing workforce. CONCLUSIONS: There is some indication that nurses have experienced a loss of key management positions, which may impact on their capacity to ensure that adequate and safe care is provided at the ward level.  相似文献   
102.
Purpose To determine the efficacy of a cystoscopic approach, as definitive treatment of ureteral fistulae, after failure of antegrade ureteral stent insertion.Methods Of 43 ureter fistulae encountered over 4 years, 10 postoperative and/or postradiotherapy fistulae could not be stented via an antegrade approach alone. A cystoscopic approach was used, with the antegrade approach available as back-up, if necessary.Results In two patients the ureteral orifice could not be visualized cystoscopically, thus precluding the retrograde approach. In the eight remaining patients, the retrograde approach alone never allowed successful stenting. In six patients, combined antegrade and retrograde approaches permitted stent insertions. In three of those six patients, a complex catheterization procedure was necessary. In two patients the combined approach failed altogether. Therefore, 6 of 10 patients underwent a successful stenting procedure with the combined approach; all ultimately closed the fistula.Conclusion Antegrade stent insertion remains the treatment of choice for ureteral leaks. If the antegrade approach fails, the retrograde approach alone is not likely to be successful. Instead, a combination of both approaches often does succeed.  相似文献   
103.
104.
BACKGROUND: Auriculotemporal syndrome (AS) is an uncommon disorder that may present with facial erythema with chewing food. METHODS: We report a patient referred to an allergist to rule out allergy as a reason for food-associated bilateral facial flushing. She was subsequently found to have bilateral AS. RESULTS: The symptoms of AS may overlap those associated with food allergy. There are only a few published cases of bilateral AS. CONCLUSIONS: Allergists should be aware of bilateral AS and the clinical spectrum of this disorder as AS patients may be referred to allergists to rule out food allergy.  相似文献   
105.
106.
107.
Experimental allergic encephalomyelitis (EAE) is an autoimmune inflammatory disease of the central nervous system (CNS). In particular in the CsA-induced chronic relapsing form (CREAE), pronounced demyelination occurs, in temporal association with relapses. It is still a matter of discussion which cell type ultimately is responsible for the actual process of demyelination. Macrophages, cytotoxic T lymphocytes and also astrocytes are possible candidates. In this short overview, the role of macrophages in the pathogenesis of EAE is discussed. It is shown that in particular, newly recruited macrophages play a crucial role in the generation of clinical signs. Possible mechanisms by which macrophages are involved in the pathogenesis of demyelinating diseases are presented.  相似文献   
108.
109.
Bone disorders following gastrectomy were studied by measuring absolute and relative bone mineral density of the Wards triangle, serum 1,25-(OH)2-D, alkaline phosphatase, and total serum calcium. The subjects were 20 males who had undergone total gastrectomy not more than three months previously (group A1). Seventeen of these patients were reviewed three years later (group A2). Absolute and relative bone density were significantly lower in group A2 than in A1 (0.52 ± 0.011 g/cm2 versus 0.6 ± 0.014 g/cm2,P<0.01 and 85.5 ± 1.4% age-matched control versus 95 ± 1.3%,P<0.01). 1,25-(OH)2-D was significantly lower in group A2 than in group A1 (14.3 ± 0.97 pg/ml versus 20.6 ± 1.02 pg/ml,P<0.01). There was no difference in alkaline phosphatase and calcium serum concentration. The mean weight loss was 6.26 ± 0.57% over the follow-up period, and weight loss correlated with absolute and relative bone density (r=–0.74,P<0.01). There was a positive correlation between 1,25-(OH)2-D and absolute or relative bone density (r=0.67,r=0.62 andP<0.01). These data suggest that bone density decrease has already occurred three years after total gastrectomy and is positively correlated to 1,25-(OH)2-D deficiency. As no differences in serum alkaline phosphatase and serum calcium concentration were found, these factors are of little value for the early detection of postgastrectomy bone disorders, whereas weight loss is a valuable screening parameter.  相似文献   
110.
The establishment of a biorepository with linkage to clinical and epidemiologic data will provide an invaluable resource for cancer research, including studies of cancer etiology, progression, and prognosis, as well as development of biomarkers for early detection. Developing an infrastructure for a biorepository linked to clinical, pathologic, and epidemiologic data requires significant efforts in strategic planning for efficient means to ascertain, identify, and consent participants, as well as guidelines for blood collection, processing, and storage while maintaining participant privacy rights. In this report, we present an approach to developing a Data Bank and Biorepository at our own institution, with discussion of elements to be considered when establishing such a bank.  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