全文获取类型
收费全文 | 41425篇 |
免费 | 4732篇 |
国内免费 | 154篇 |
专业分类
耳鼻咽喉 | 863篇 |
儿科学 | 1124篇 |
妇产科学 | 1009篇 |
基础医学 | 2925篇 |
口腔科学 | 3139篇 |
临床医学 | 5854篇 |
内科学 | 8485篇 |
皮肤病学 | 777篇 |
神经病学 | 3459篇 |
特种医学 | 1901篇 |
外国民族医学 | 25篇 |
外科学 | 6018篇 |
综合类 | 198篇 |
现状与发展 | 12篇 |
一般理论 | 6篇 |
预防医学 | 4673篇 |
眼科学 | 527篇 |
药学 | 1744篇 |
中国医学 | 62篇 |
肿瘤学 | 3510篇 |
出版年
2024年 | 209篇 |
2023年 | 1218篇 |
2022年 | 556篇 |
2021年 | 895篇 |
2020年 | 1386篇 |
2019年 | 720篇 |
2018年 | 1618篇 |
2017年 | 1508篇 |
2016年 | 1757篇 |
2015年 | 1863篇 |
2014年 | 2339篇 |
2013年 | 2909篇 |
2012年 | 1551篇 |
2011年 | 1547篇 |
2010年 | 1799篇 |
2009年 | 2390篇 |
2008年 | 1504篇 |
2007年 | 1237篇 |
2006年 | 1413篇 |
2005年 | 1197篇 |
2004年 | 998篇 |
2003年 | 950篇 |
2002年 | 878篇 |
2001年 | 938篇 |
2000年 | 869篇 |
1999年 | 868篇 |
1998年 | 700篇 |
1997年 | 631篇 |
1996年 | 657篇 |
1995年 | 540篇 |
1994年 | 488篇 |
1993年 | 514篇 |
1992年 | 760篇 |
1991年 | 695篇 |
1990年 | 580篇 |
1989年 | 440篇 |
1988年 | 408篇 |
1987年 | 399篇 |
1986年 | 329篇 |
1985年 | 367篇 |
1984年 | 280篇 |
1983年 | 239篇 |
1982年 | 205篇 |
1981年 | 189篇 |
1979年 | 200篇 |
1977年 | 170篇 |
1976年 | 167篇 |
1975年 | 171篇 |
1974年 | 206篇 |
1973年 | 171篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Kelley Withy MD MS ; January May Andaya; Judith S. Mikami RN MPH ; Seiji Yamada MD MPH 《The Journal of rural health》2007,23(1):84-88
CONTEXT: Health disparities between rural and urban communities are well documented. There are many suggested causes and many proposed solutions but no one-size-fits-all answer. The most successful community interventions have been introduced by communities themselves. However, before communities invest in such interventions, each group must identify and prioritize their needs. PURPOSE: This article describes the Hoshin facilitation method as a practical option assisting communities in assessing their needs and gaining consensus for future steps. METHODS: Thirty-four meetings were held in 11 rural communities in Hawaii using the Hoshin process to identify factors that impact rural health. Themes were identified by constant comparative analysis and thematic frequency described. Commonality of responses between communities was examined. Informal feedback was collected from meeting participants. FINDINGS: There was a great deal of commonality between community responses, with economic factors, drug use, lack of community leadership, lack of health care services and access to services, lack of healthy activities for youth, and poor public education being the most common issues noted. Group involvement in the meetings was high, and the facilitation method received positive feedback from participants. CONCLUSIONS: The Hoshin facilitation method is a very useful tool to help communities rapidly identify and prioritize areas for programmatic attention. 相似文献
72.
Dennis M Mello MD Doff B McElhinney MS Andrew J Parry MD Norman H Silverman MD Frank L Hanley MD 《The Annals of thoracic surgery》1997,64(6):1808-1810
In hearts with a common arterial trunk (truncus arteriosus), there is almost always an inverse development of the aortic arch and the ductus arteriosus. Truncus with a normal aortic arch and a patent ductus is a rare echocardiographic and surgical finding. In this report, we describe 2 neonates in whom truncus arteriosus with a normal aortic arch and a medium or large patent ductus was diagnosed by preoperative echocardiography (without catheterization) and confirmed intraoperatively. 相似文献
73.
Jeffrey T Cope MD Michael C Mauney MD David Banks BS Oliver A.R Binns MD Christopher L Moore BS Jeffrey J Rentz BS Kimberly S Shockey MS R.Christoper King MD Irving L Kron MD Curtis G Tribble MD 《The Annals of thoracic surgery》1997,63(6)
Background. Hypoxia and warm ischemia produce severe injury to cardiac grafts harvested from non–heart-beating donors. To potentially improve recovery of such grafts, we studied the effects of intravenous phenylephrine preconditioning.Methods. Thirty-seven blood-perfused rabbit hearts were studied. Three groups of non–heart-beating donors underwent intravenous treatment with phenylephrine at 12.5 (n = 8), 25 (n = 7), or 50 μg/kg (n = 7) before initiation of apnea. Non–heart-beating controls (n = 8) received saline vehicle. Hypoxic cardiac arrest occurred after 6 to 12 minutes of apnea, followed by 20 minutes of warm in vivo ischemia. A 45-minute period of ex vivo reperfusion ensued. Nonischemic controls (n = 7) were perfused without antecedent hypoxia or ischemia.Results. Phenylephrine 25 μg/kg significantly delayed the onset of hypoxic cardiac arrest compared with saline controls (9.6 ± 0.5 versus 7.7 ± 0.4 minutes; p = 0.00001), yet improved recovery of left ventricular developed pressure compared with saline controls (57.1 ± 5.3 versus 41.0 ± 3.4 mm Hg; p = 0.04). Phenylephrine 25 μg/kg also yielded a trend toward less myocardial edema than saline vehicle (p = 0.09).Conclusions. Functional recovery of nonbeating cardiac grafts is improved by preconditioning. We provide evidence that the myocardium can be preconditioned with phenylephrine against hypoxic cardiac arrest.(Ann Thorac Surg 1997;63:1664–8) 相似文献
74.
75.
76.
77.
78.
Evaluation of intrinsic and extrinsic motivation interventions with a self-help smoking cessation program 总被引:8,自引:0,他引:8
Personalized feedback and a financial incentive, developed from an intrinsic/extrinsic motivation framework, were evaluated as adjuncts to self-help materials for smoking cessation. Ss (N = 1,217) were randomized to 4 treatment groups and were followed up at 3 and 12 months. Consistent with hypotheses derived from the motivation framework, the financial incentive increased the use of self-help materials, did not increase cessation rates among program users, and was associated with higher relapse rates among those who did manage to quit. The personalized feedback increased both smoking cessation and use of the materials 3 months after distribution of the materials. Continuous abstinence (abstinence at 3 and 12 months) in the group that received the personalized feedback alone was twice the rate of the other groups. 相似文献
79.
With increasing numbers of primary anterior cruciate ligament reconstruction, the incidence of unsatisfactory results and graft failures will increase. The goals of revision reconstruction are similar to those of primary reconstruction and include stabilization of the knee, prevention of secondary degenerative changes, and recovery of knee function. Besides the recurrent tear there are specific technical failures, such as tunnel malplacement and unrecognized associated ligamentous pathologies, which might lead to graft failure. Thus, preoperative planning includes a detailed analysis of failure mechanisms by thorough preoperative history taking, comprehensive physical examination, and appropriate radiographic evaluation. The treatment algorithm addresses issues of hardware removal, need for a staged procedure or concomitant surgery, graft source, tunnel placement, and graft fixation. Correct placement of tunnels and graft fixation are the essential surgical steps, which might also influence graft selection. Successful revision ACL surgery requires a motivated and compliant patient and an experienced surgeon who is proficient in a variety of different surgical techniques. However, since clinical outcome is reported to be inferior in revision compared to primary ACL reconstruction the importance of counseling the patient preoperatively regarding less satisfactory results than in most primary ACL reconstructions must be emphasized. This article describes indications, analysis and surgical procedures for revision anterior cruciate ligament reconstruction. 相似文献
80.
Evidence of Increased Class I MHC Expression on Human Peripheral Blood Lymphocytes during Acute Ethanol Intoxication 总被引:1,自引:0,他引:1
Michael A. Kolber PhD MD Ron M. Walls MD Marion L. Hinners MS Dinah S. Singer PhD 《Alcoholism, clinical and experimental research》1988,12(6):820-823
Certain ethanol-related diseases in humans have been linked to disorders of immunity. Although humoral and cellular immunity have been studied, the precise mechanisms whereby ethanol use leads to tissue damage remain unknown. In order to explore the hypothesis that ethanol may lead to alteration in expression of tissue Class I major histocompatibility antigen causing an autoimmune phenomenon, a population of acutely ethanol-intoxicated patients was studied. Measurement of Class I major histocompatibility antigen on peripheral blood lymphocytes in this population showed a highly significant (p less than 0.01) increase over controls. The role that this increased antigenicity may play in the evolution of clinical disease is discussed. 相似文献