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   71478篇
  免费   4047篇
  国内免费   157篇
耳鼻咽喉   901篇
儿科学   1565篇
妇产科学   1451篇
基础医学   9361篇
口腔科学   2677篇
临床医学   5675篇
内科学   17719篇
皮肤病学   1701篇
神经病学   6453篇
特种医学   1653篇
外科学   9639篇
综合类   411篇
一般理论   33篇
预防医学   6240篇
眼科学   1299篇
药学   4752篇
中国医学   252篇
肿瘤学   3900篇
  2023年   471篇
  2022年   234篇
  2021年   1199篇
  2020年   700篇
  2019年   1253篇
  2018年   2162篇
  2017年   1305篇
  2016年   1405篇
  2015年   2099篇
  2014年   2165篇
  2013年   3171篇
  2012年   6089篇
  2011年   5960篇
  2010年   2782篇
  2009年   2055篇
  2008年   5079篇
  2007年   5264篇
  2006年   5430篇
  2005年   5113篇
  2004年   4619篇
  2003年   4190篇
  2002年   4006篇
  2001年   1678篇
  2000年   2207篇
  1999年   1119篇
  1998年   247篇
  1997年   190篇
  1996年   186篇
  1995年   174篇
  1994年   136篇
  1993年   134篇
  1992年   203篇
  1991年   189篇
  1990年   133篇
  1989年   143篇
  1988年   118篇
  1987年   104篇
  1986年   116篇
  1985年   139篇
  1984年   161篇
  1983年   115篇
  1982年   123篇
  1981年   98篇
  1980年   108篇
  1979年   102篇
  1978年   91篇
  1977年   92篇
  1976年   78篇
  1974年   71篇
  1973年   66篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
112.
Ischemic stroke occurs in 0.2-0.4% of patients undergoing left heart catheterization, and is responsible for 5-10% of the mortality associated with the procedure. The main predisposing factors for this complication are female gender, complex atherosclerotic plaques in the ascending aorta, and peripheral arterial disease. The possibility of timely intervention with reperfusion therapy supports close clinical monitoring during the immediate post-catheterization period. The cardiologist should be familiar with the various types of stroke reperfusion therapy and its indications according to the time interval between catheterization and the stroke. The decision should be discussed with neurology and neuroradiology.  相似文献   
113.
114.
Family social support: toward a conceptual model   总被引:1,自引:0,他引:1  
Nursing clinical assessment and empirical investigations of the social support resources available to families are hampered by the lack of theoretical bases regarding the family social support process. This article presents a preliminary conceptual model of family social support in the interest of stimulating discussion and further development. Assumptions of the model are presented, family characteristics and interaction processes are identified, and propositional statements are derived from the model. The model proposes that social support is not an outcome or a resource but a process of interaction through which the family develops versatility and resourcefulness in identifying and using resources available in its environment. The conceptual model presents family social support as a process of relationships between the family and its social environment.  相似文献   
115.
The modulation of extracellular 5-hydroxytryptamine (5-HT) in the central nucleus of the amygdala (CeA) by 5-HT1A receptors was studied by intracerebral microdialysis in awake and freely moving rats. Local administration of 1 μM tetrodotoxin (TTX), 60 mM K+ and perfusion with Ca2+-free Ringer containing EGTA confirmed that the major part of dialysate 5-HT levels from the CeA is of neuronal origin. Administration of 300 nM of RU 24969, a 5-HT1B receptor agonist, through the probe into the CeA decreased dialysate 5-HT levels to 67.2% of the baseline value. Systemic administration of the 5-HT1A receptor agonists 8-OH-DPAT and flesinoxan dose-dependently decreased 5-HT levels in the CeA. The effect of 0.3 mg/kg of flesinoxan could be completely antagonized by systemic administration of 0.05 mg/kg WAY 100635, a 5-HT1A receptor antagonist. WAY 100635 alone had only minimal effects at this dose. These data show that a major part of the extracellular 5-HT in the CeA stems from 5-HT neurons and that the amount of 5-HT released into this brain region can be modulated by 5-HT1A receptors. Received: 11 September 1996 / Accepted: 25 November 1996  相似文献   
116.
117.
This study investigated relationships between child/parent dissatisfaction with child facial appearance and the self-concept/social competence of 8- to 15-year-old children with (N = 34) and without (N = 34) oral clefts. Children in both groups had normative psychosocial adjustment, but also reported moderate dissatisfaction with facial appearance. Cleft group parents were more likely to agree with their child's dissatisfaction. When cleft group parents were more dissatisfied with child facial appearance, their children reported better quality of life. Results suggest that parents of children with clefts reporting greater dissatisfaction may respond in positive ways that enhance quality of life.  相似文献   
118.
BACKGROUND AND OBJECTIVES: The aim of this study was to compare in a prospective nonrandomized study, the efficacy of 2 methods of administering methotrexate (MTX) in the treatment of ectopic pregnancy (EP): transvaginal injection under sonographic control or intramuscular injection (IM). METHODS: Patients with EP who met specific inclusion criteria for medical treatment were treated with MTX: 63 patients (group 1) were treated by IM and 47 patients (group 2) by transvaginal local injection. In group 1, 50 mg/m2 of MTX was injected intramuscularly; in group 2, transvaginal injection of 1 mg/kg of MTX was injected into the ectopic sac under sonographic control. When an additional dose of MTX was required, it was administrated IM at the dosage of 50 mg/m2 in both groups. RESULTS: The overall success rate, defined by a posttreatment normal hCG level (< 10 mUI/mL) was 71.4% in group 1 versus 91.5% in group 2 (P < 0.01); for patients with hCG levels < 2000 mUI/mL, 83% and 96%, respectively (not significant); for patients with hCG > or = 2000 mUI/mL, 37.5% and 86.4%, respectively (P < 0.01). CONCLUSION: In the medical treatment of EP, the efficacy of MTX is greater when administered by local transvaginal injection than by IM injection. We propose local treatment every time EP can be punctured, especially when hCG levels are > or = 2000 mUI/mL.  相似文献   
119.
120.
OBJECTIVE: Respiratory scleroma (RS) is a progressive, chronic, granulomatous disease caused by Klebsiella rhinoscleromatis. There is only one report of RS association with HLA-DQ3. In this study, molecular association of HLA class II and RS was determined. STUDY DESIGN AND SETTING: Nine RS patients and 163 healthy controls were compared. DQA1, DQB1, and DRB1 loci were typed. RESULTS: Statistical analysis demonstrated association between DQB1*0301 and susceptibility to RS (P(c) = 0.004). Haplotype analysis showed an association of DQA1*03011-DQB1*0301 (P = 1.21E-19) and DRB1*0407-DQA1*03011-DQB1*0301 (P = 0.0002). CONCLUSIONS: Results established that DQA1*03011-DQB1*0301 haplotype is a strong risk factor for development of RS.  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