全文获取类型
收费全文 | 235617篇 |
免费 | 15467篇 |
国内免费 | 991篇 |
专业分类
耳鼻咽喉 | 2526篇 |
儿科学 | 6020篇 |
妇产科学 | 4422篇 |
基础医学 | 29481篇 |
口腔科学 | 4346篇 |
临床医学 | 24312篇 |
内科学 | 49656篇 |
皮肤病学 | 3226篇 |
神经病学 | 23756篇 |
特种医学 | 10145篇 |
外国民族医学 | 13篇 |
外科学 | 37190篇 |
综合类 | 2581篇 |
现状与发展 | 1篇 |
一般理论 | 177篇 |
预防医学 | 16608篇 |
眼科学 | 5537篇 |
药学 | 15524篇 |
1篇 | |
中国医学 | 320篇 |
肿瘤学 | 16233篇 |
出版年
2023年 | 1233篇 |
2022年 | 1884篇 |
2021年 | 5350篇 |
2020年 | 3059篇 |
2019年 | 5070篇 |
2018年 | 6080篇 |
2017年 | 4455篇 |
2016年 | 4877篇 |
2015年 | 5750篇 |
2014年 | 8383篇 |
2013年 | 11288篇 |
2012年 | 17339篇 |
2011年 | 18085篇 |
2010年 | 10113篇 |
2009年 | 9353篇 |
2008年 | 15941篇 |
2007年 | 16737篇 |
2006年 | 16262篇 |
2005年 | 16125篇 |
2004年 | 15150篇 |
2003年 | 13848篇 |
2002年 | 13233篇 |
2001年 | 1971篇 |
2000年 | 1479篇 |
1999年 | 2051篇 |
1998年 | 2799篇 |
1997年 | 2229篇 |
1996年 | 1933篇 |
1995年 | 1771篇 |
1994年 | 1544篇 |
1993年 | 1499篇 |
1992年 | 1009篇 |
1991年 | 964篇 |
1990年 | 808篇 |
1989年 | 772篇 |
1988年 | 701篇 |
1987年 | 645篇 |
1986年 | 654篇 |
1985年 | 705篇 |
1984年 | 935篇 |
1983年 | 798篇 |
1982年 | 1036篇 |
1981年 | 971篇 |
1980年 | 842篇 |
1979年 | 473篇 |
1978年 | 527篇 |
1977年 | 457篇 |
1976年 | 435篇 |
1975年 | 326篇 |
1974年 | 320篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
101.
102.
Dear Sir In the recently published Task force report, under section Fibrinolyticregimens, the authors recommend not to re-administerstreptokinase for at least 10 years. The reference supportingthis statement is Ref. 51. After evaluating this paper and lookinginto the literature my comments 相似文献
103.
Mark S. Wallace Steven G. Charapata Robert Fisher Michael Byas‐Smith Peter S. Staats Martha Mayo Dawn McGuire David Ellis 《Neuromodulation》2006,9(2):75-86
Objective. The safety and efficacy of intrathecal (IT) ziconotide was studied in a randomized, double‐blind, placebo‐controlled trial. Materials and Methods. Patients (169 ziconotide, 86 placebo) with severe chronic nonmalignant pain unresponsive to conventional therapy and a visual analog scale of pain intensity (VASPI score) ≥ 50 mm were treated over a 6‐day period in an inpatient hospital setting. Initial starting dose was 0.4 µg/hour and was titrated to analgesia or intolerance (maximum dose 7.0 µg/hour). The starting and maximum doses were reduced to 0.1 µg/hour and 2.4 µg/hour, respectively, due to adverse events (AEs). Results. The mean percent reduction in VASPI score from baseline was 31.2% and 6.0% for ziconotide‐ and placebo‐treated patients, respectively (p ≤ 0.001). During the initial titration phase, a significantly greater percentage of patients in the ziconotide group compared to the placebo group reported AEs, including abnormal gait, amblyopia, dizziness, nausea, nystagmus, pain, urinary retention, and vomiting. Conclusion. Ziconotide provided significant analgesia in patients for whom conventional therapy failed. However, there was a considerable incidence of ziconotide‐associated AEs due to the rapid titration and high doses administered. 相似文献
104.
105.
Emir Q. Haxhija Prof. Dr. Johannes M. Mayr Wolfgang Grechenig Michael E. Höllwarth 《Operative Orthopadie und Traumatologie》2006,18(2):120-134
OBJECTIVE: Surgical reduction and retention of apophyseal avulsion injuries at the medial epicondyle to prevent joint instability, lasting malalignment, or pseudarthrosis. INDICATIONS: Absolute: intraarticular apophyseal dislocation of the medial epicondyle, complete lesion of the ulnar nerve. Relative: dislocation of the apophysis (> 4 mm) in children > 5 years of age; the need for intervention increases in children as the degree of dislocation, age, and athletic activity increase. CONTRAINDICATIONS: Dislocation of the medial epicondyle (< or = 4 mm) in children < 5 years of age, provided the fragment location is not intraarticular. SURGICAL TECHNIQUE: Open reduction of the apophysis through a medial approach. Identification of the ulnar nerve. In young children or with small fragments fixation with Kirschner wire. Screw fixation in older children or for larger fragments. POSTOPERATIVE MANAGEMENT: Long upper-arm plaster cast until wound healing is achieved. Subsequently, upper-arm plaster cast for 3 weeks. Removal of Kirschner wires after 4-6 weeks, screw removal after 8-12 weeks. Physiotherapy only if marked reduction of elbow mobility is found 6 weeks after cast removal. RESULTS: From January 1, 1994 to December 31, 2003, 25 children with an average age of 12 years suffering from medial epicondylar avulsion fractures were operated on using open reduction and Kirschner wire fixation. An average of 3 years after the injury 14 of these children underwent follow-up examination using a procedure that took subjective, clinical and radiologic parameters into account. Two children showed a slight reduction in overall strength of the injured extremity when compared with the contralateral extremity. One child had a flexion deficit of 10 degrees, all other children showed movement limitations of < or = 5 degrees compared to the contralateral extremity. In all the cases available to follow-up, there was a slight increase in valgus alignment of the elbow joint compared with the uninjured side (3 degrees on average). All fractures consolidated within 6 weeks. 相似文献
106.
Analyzing and shaping human attentional networks. 总被引:12,自引:0,他引:12
In this paper we outline a conception of attentional networks arising from imaging studies as connections between activated brain areas carrying out localized mental operations. We consider both the areas of functional activation (nodes) and the structural (DTI) and functional connections (DCM) between them in real time (EEG, frequency analysis) as important tools in analyzing the network. The efficiency of network function involves the time course of activation of nodes and their connectivity to other areas of the network. We outline landmarks in the development of brain networks underlying executive attention from infancy and childhood. We use individual differences in network efficiency to examine genetic alleles that are related to performance. We consider how animal studies might be used to determine the genes that influence network development. Finally we indicate how training may aid in enhancing attentional networks. Our goal is to show the wide range of methods that can be used to suggest and analyze models of network function in the study of attention. 相似文献
107.
Michael Givel 《Int J Health Serv》2006,36(1):137-155
From the early 1980s to the present, neoliberal doctrine has called for government policies of privatization, funding cutbacks, and deregulation of public health and other domestic social programs in the belief that the market rather than the public sector can best organize and distribute crucial societal services. Proponents of a neoliberal and deregulatory mixed approach of command and control and self-regulation argue this approach provides the most adequate means to conduct regulation in the legalistic and adversarial U.S. regulatory process. In April 1994, the Occupational Safety and Health Administration issued a proposed rule to eliminate tobacco smoking in most workplace rooms, arguing secondhand tobacco smoke annually killed up to 13,700 nonsmokers. The tobacco industry purposely delayed public hearing procedures (later halted altogether by Congress and the president) primarily to advance unhindered private property rights and profits rather than submitting to a public command-and-control regulatory framework to reduce deaths due to secondhand tobacco smoke. 相似文献
108.
109.
110.
Jay Nicholson Peter Mirtschin Frank Madaras Michael Venning Michael Kokkinn 《Toxicon》2006,48(4):422-428
The digestive properties of Australian elapid snake venoms have not been studied to any great extent. To address this, the in vitro digestive properties of Oxyuranus scutellatus (Australian Coastal Taipan) venom were investigated in a simulation of the in vivo conditions using the parameters reported for the stomach of snakes and representative prey for this species. The amount of soluble protein released was measured over time using a bicinchoninic acid (BCA) assay. Dismembered mouse hindlegs were injected intramuscularly with 0.1 ml O. scutellatus venom (concentration 10 mg/ml) and maintained in a micro-anaerobic, acidic environment (pH approximately 1.2-1.7) at 25 degrees C. The bathing liquid was sampled every 24 h for 7 days, and assayed for soluble protein. Statistical analysis revealed that O. scutellatus venom increased the rate at which proteins were released when compared to a negative control suggesting the potential importance of envenomation in the digestion of whole prey. 相似文献