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   87963篇
  免费   6751篇
  国内免费   1740篇
耳鼻咽喉   755篇
儿科学   1980篇
妇产科学   1143篇
基础医学   3708篇
口腔科学   4570篇
临床医学   8128篇
内科学   10906篇
皮肤病学   1619篇
神经病学   5350篇
特种医学   2175篇
外国民族医学   21篇
外科学   9428篇
综合类   15339篇
现状与发展   8篇
一般理论   4篇
预防医学   6270篇
眼科学   1572篇
药学   8383篇
  163篇
中国医学   8987篇
肿瘤学   5945篇
  2024年   314篇
  2023年   1427篇
  2022年   2539篇
  2021年   3521篇
  2020年   3756篇
  2019年   3224篇
  2018年   2945篇
  2017年   3086篇
  2016年   3247篇
  2015年   2990篇
  2014年   5887篇
  2013年   8023篇
  2012年   5797篇
  2011年   6099篇
  2010年   5131篇
  2009年   4414篇
  2008年   3886篇
  2007年   4146篇
  2006年   3724篇
  2005年   3143篇
  2004年   2631篇
  2003年   2293篇
  2002年   1914篇
  2001年   1557篇
  2000年   1316篇
  1999年   1030篇
  1998年   841篇
  1997年   779篇
  1996年   640篇
  1995年   565篇
  1994年   529篇
  1993年   449篇
  1992年   368篇
  1991年   331篇
  1990年   243篇
  1989年   252篇
  1988年   226篇
  1987年   215篇
  1986年   196篇
  1985年   375篇
  1984年   375篇
  1983年   260篇
  1982年   297篇
  1981年   266篇
  1980年   233篇
  1979年   228篇
  1978年   163篇
  1977年   113篇
  1976年   132篇
  1975年   111篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
61.
The treatment times for the fabrication of Extensive Amalgam Restorations (EAR) as recorded in a longitudinal clinical trial at the Dental School in Nijmegen were analyzed. 269 EAR's with different retention methods were made on molars by three operators. A mean total treatment time of 60 min was found. The factor operator had a significant influence on all treatment phases resulting in a 26% difference in total treatment time between operators. Also significant influences were found in some treatment phases for the factor retention, side location of the tooth and extension of the restoration. The results of this study with regard to treatment times must be considered from the perspective of the quality of the care provided.  相似文献   
62.
锁骨中段骨折--手术与非手术治疗比较   总被引:5,自引:3,他引:2  
有些证据表明,锁骨中段骨折采用手术或非手术治疗都可以获得成功,但非手术治疗的并发症更少。数据多数来自病例组研究,因此还需要对比研究来证明这些原始数据的真实性。  相似文献   
63.
目的 探讨出血性脑室铸型的治疗方法与疗效。方法 分析脑室外引流、尿激酶脑室内注入、气管切开、控制血压以及脑积水的处理等多种治疗手段在治疗脑室铸型过程中的作用及其效果。结果 经过综合治疗完全恢复日常生活者10例(28.6%),部分恢复日常工作或独立进行家庭生活者13例(37.1%),生活需要照顾或护理者7例(20%),死亡5例(14.2%)。结论 对于出血性脑室铸型这类重症病人早期及时的脑室外引流是快速而有效的抢救措施,尿激酶脑室内注入对溶解血凝块,疏通脑室系统行之有效。气管切开对降低死亡率至关重要,控制血压是防止再出血的关键。脑积水的处理是康复过程中需要高度重视的环节。  相似文献   
64.
目的:提高原发性输尿管癌的术前诊断水平。方法:对南京医科大学第一附属医院1989-2002年间收治的31例原发性输尿管癌的临床资料进行回顾性分析。结果:31例中,肉眼血尿22例(71.0%),腰痛11例(35,5%)。B超、静脉肾盂造影(IVU)、CT和逆行造影检查的阳性率分别为输尿管腔内占位4例(13.0%)、输尿管腔内占位3例(11.5%)、膀胱或合并膀胱占位8例(36.4%),输尿管充盈缺损6例(40.0%)。29例患者经手术治疗,其中13例行患侧肾、输尿管、膀胱袖状切除。结论:老年患者反复发作的腰痛及血尿应考虑原发性输尿管癌的可能,造影诊断对本病有较高价值,应作CT及MRU无创检查。  相似文献   
65.
We present a case of benign osteoblastoma of the occipital bone. Benign osteoblastoma is an uncommon primary bone tumor, which usually involves the vertebrae and the long bones. This tumor rarely develops in the calvaria, showing a preference for the temporal and frontal bones when it does. To the best of our knowledge, this case is only the eighth reported case of benign osteoblastoma confined to the occipital bone. A 20‐year‐old male presented with a mild tender mass lesion of the occipital area, just below the lambda. Plain X‐ray films and CT scans demonstrated an osteolytic mass surrounded by the sclerotic rim within the diploic space. MRI proved to be effective for the evaluation of the intracranial and intraosseous extensions of the tumor. However, it was very difficult to formulate a differential diagnosis against other osteoblastic tumors, or osteoid osteoma, in view of its radiological appearance. The final diagnosis was obtained by careful consideration of the histopathological characteristics of the tumor combined with its clinical and radiological features. Although generally regarded as benign, a complete resection is preferred over conventional curettage as this can guard against possible recurrence and malignant transformation.  相似文献   
66.
Contemporary licensed treatments for multiple sclerosis fail to provide a solution for the disease because their effects are limited to a modest reduction in the frequency of new episodes. They do not reduce disability or materially influence the progressive phase of the disease. A contemporary strategy for management requires a more detailed analysis of the separate contributions to the clinical features and overall course made by inflammation, axonal injury, compensatory mechanisms, and remyelination. From this formulation emerges the need either for early and fully effective suppression of the inflammatory response, limiting the damage to all components of the axon-glial unit; or the development of strategies for axonal and myelin repair that solve the issues of controlled differentiation, delivery and timing of these cell and growth factor-based interventions.  相似文献   
67.
本文根据34例电击伤临床资料,分析早期处理与病人全身情况、局部损伤愈合以及并发症的关系.并讨论间生态组织的处理原则.结果表明:伤后1天内与伤后3天以上就诊的病人比较,前者全身情况良好,创面感染率低,局部损伤用皮瓣或(和)皮片覆盖效果满意,并发症及截肢率均较低  相似文献   
68.
69.
Abstract Economic factors in diagnosis and treatment planning in periodontology may be considered from several points of view. A first perspective is that of government responsibility. Because of the explosion in health care expenditure in the last decade, public funding of dental care programmes may become static or even reduced. Most governments try to curb the ever growing public health expenditure. Consequently, terms like effectiveness, efficiency and accountability are now becoming common words also in relation to periodontal health care. Moreover, private insurance companies, which have entered this area, may be individual patient who, explicitly or implicitly, would like to consider the services individual patient, who explicitly or implicitly, would like to consider the sendees rendered in periodontal therapy and prevention as cost-effective. Features of supply of and demand for care on an individual basis should also be considered. Finally, the periodontist or general practitioner has to consider economic factors. In professional life, there should be a balance between good working conditions providing satisfactory care, and the demands and priorities of individual patients and the community at large.  相似文献   
70.
Background: The aim of this study was to evaluate the effects of azithromycin on mucocutaneous manifestations, oral health and immune response in Behçet's disease (BD). Methods: Eight BD patients with active mucocutaneous symptoms were treated with azithromycin for 4 weeks. Oral health, clinical manifestations and in vitro interleukin (IL)‐12, interferon (IFN)‐γ, IL‐10 and monocyte chemotactic protein (MCP)‐1 responses were evaluated before and after treatment. Results: The number of folliculitic lesions, healing time of oral ulcers and scores of plaque indexes (PLIs) were lower after azithromycin treatment (P < 0.05). Scores of PLIs correlated positively with the healing time of oral ulcers (P = 0.02). Although a trend towards increased stimulated IL‐10 responses with azithromycin was observed, no statistically significant difference was found. Stimulated and unstimulated MCP‐1, IFN‐γ and IL‐12 responses were similar before and after treatment (P > 0.05). Conclusion: Azithromycin was observed to be effective in decreasing folliculitic lesions and fastening the healing time of oral ulcers in BD.  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