全文获取类型
收费全文 | 32116篇 |
免费 | 2500篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 374篇 |
儿科学 | 655篇 |
妇产科学 | 702篇 |
基础医学 | 4136篇 |
口腔科学 | 514篇 |
临床医学 | 3647篇 |
内科学 | 6683篇 |
皮肤病学 | 517篇 |
神经病学 | 2755篇 |
特种医学 | 1148篇 |
外科学 | 5147篇 |
综合类 | 465篇 |
一般理论 | 57篇 |
预防医学 | 2815篇 |
眼科学 | 709篇 |
药学 | 2038篇 |
中国医学 | 25篇 |
肿瘤学 | 2295篇 |
出版年
2023年 | 308篇 |
2022年 | 484篇 |
2021年 | 1133篇 |
2020年 | 587篇 |
2019年 | 976篇 |
2018年 | 1085篇 |
2017年 | 789篇 |
2016年 | 835篇 |
2015年 | 960篇 |
2014年 | 1407篇 |
2013年 | 1646篇 |
2012年 | 2634篇 |
2011年 | 2634篇 |
2010年 | 1410篇 |
2009年 | 1259篇 |
2008年 | 1982篇 |
2007年 | 2025篇 |
2006年 | 1863篇 |
2005年 | 1745篇 |
2004年 | 1527篇 |
2003年 | 1343篇 |
2002年 | 1127篇 |
2001年 | 409篇 |
2000年 | 367篇 |
1999年 | 294篇 |
1998年 | 203篇 |
1997年 | 164篇 |
1996年 | 114篇 |
1995年 | 112篇 |
1994年 | 89篇 |
1993年 | 99篇 |
1992年 | 245篇 |
1991年 | 224篇 |
1990年 | 200篇 |
1989年 | 179篇 |
1988年 | 204篇 |
1987年 | 169篇 |
1986年 | 175篇 |
1985年 | 164篇 |
1984年 | 108篇 |
1983年 | 112篇 |
1982年 | 64篇 |
1981年 | 64篇 |
1979年 | 82篇 |
1978年 | 89篇 |
1976年 | 63篇 |
1975年 | 67篇 |
1973年 | 100篇 |
1971年 | 67篇 |
1970年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
51.
52.
Michael J. Lambert Jason L. Whipple David A. Vermeersch David W. Smart Eric J. Hawkins Stevan Lars Nielsen Melissa Goates 《Clinical psychology & psychotherapy》2002,9(2):91-103
Several systems have been developed to monitor and feedback information about a client's responses to psychotherapy as a method of enhancing client outcome. The current study divided 1020 clients into four groups (two experimental and two control) to determine if feedback regarding client progress, when provided to a therapist, affected client outcome and number of sessions attended. Results showed that feedback increased the duration of treatment and improved outcome for clients identified as potential treatment failures thereby replicating an earlier study using nearly identical methodology. Nearly twice as many clients in the feedback group achieved clinically significant or reliable change and fewer were classified as deteriorated by the time treatment ended. For those clients who were predicted to have a positive response to treatment, feedback to therapists resulted in an equal number of treatment sessions and equivalent outcomes compared to the no feedback controls. The results are discussed in terms of quality management in routine clinical practice and the need to base treatment decisions on clients' response to treatment rather than arbitrary session limits. Suggestions for additional research aimed at enhancing the effects of feedback on client outcome are made. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
53.
Prediction of choledocholithiasis using a pocket microcomputer 总被引:4,自引:0,他引:4
T V Taylor C P Armstrong S Rimmer S B Lucas J Jeacock A A Gunn 《The British journal of surgery》1988,75(2):138-140
A computerized method, using a small pocket computer, has been used to predict the presence of choledocholithiasis in a prospective series of 239 patients undergoing cholecystectomy. From an initial data base of 424 patients 36 factors were evaluated and the most important 2 of these were determined by multivariate analysis for use in the prospective analysis. Satisfactory operative cholangiograms were a prerequisite to evaluation of the statistical method and were obtained in 90.4 per cent of cases. Using the computerized method a common bile duct stone would have been overlooked in only 1 patient but 17 unnecessary explorations would have been carried out. The overall accuracy of the computerized method was 92.5 per cent. When the method was applied to a further study of 97 patients from a separate centre the overall accuracy was 85.6 per cent. If the method was used to aid selective use of operative cholangiography, cholangiograms would be performed in 20 per cent and stones would be overlooked in less than 1 per cent. 相似文献
54.
55.
56.
57.
P H Brown J Lenney S Armstrong A C Ning G K Crompton 《The European respiratory journal》1992,5(9):1143-1145
An open, randomized, cross-over study was performed to compare the efficacy and acceptability of two breath-actuated inhalers, the Turbohaler (T) and Diskhaler (D), for delivery of beta-agonists. Thirty six adults with chronic asthma requiring beta-agonists four times daily were treated with terbutaline 500 micrograms via T and salbutamol 400 micrograms via D four times daily, each period lasting four weeks. Additional bronchodilator via pressurized aerosol was permitted as required. Peak expiratory flow (PEF) was recorded in the morning (before and after beta-agonist) and in the evening. The mean morning PEF was higher during the first two weeks using T (295 l.min-1) than whilst using D (281 l.min-1, p < 0.01), but this difference did not persist during the second two weeks and there were no differences in post-bronchodilator PEF or rescue beta-agonist use. After four weeks, > 90% of patients used both inhaler devices efficiently and they were equally acceptable in terms of ease of use and convenience to carry. The Diskhaler and Turbohaler achieve similar clinical efficacy for delivery of beta-agonists. 相似文献
58.
59.
C Dawson M W Armstrong S C Fulford R M Faruqi R B Galland 《Journal of the Royal College of Surgeons of Edinburgh》1992,37(3):177-179
Many conventional dressings are painful when removed, and may be detrimental to healing. In a pilot study ten consecutive abscesses, requiring incision and drainage, were packed with a calcium alginate dressing: this was well tolerated, its removal causing minimal pain. No adverse effects were attributable to its use. A controlled trial was therefore carried out to compare calcium alginate with the more traditional saline-soaked gauze for packing abscess cavities, following incision and drainage. Patients were randomized to receive either calcium alginate (16 patients) or gauze dressing (18 patients). At the first dressing change the patient marked on a linear analogue scale the pain experienced; the nurse noted similarly the ease of removal of the dressing. Calcium alginate was significantly less painful to remove after operation (P less than 0.01), and also easier to remove (P less than 0.01) than gauze dressings. If abscess cavities are packed after incision and drainage, calcium alginate appears to be an improvement on conventional dressings. 相似文献
60.
The combinations of ampligen and zidovudine at ratios of 100:1, 25:1, 10:1, and 1:50 acted synergistically to reduce cytopathology caused by HIV in MT-2 cell cultures. Combination indices were less than 1 at all of these ratios representing different combinations of concentrations and at 3 effective doses (ED30, ED50, ED70). Combination of drugs which show synergism at a wide range of ratios of combinations suggest that they may be useful clinically, and that the antiviral efficacy of ZDV may be increased in combination with ampligen. Synergism was also found between ampligen and zidovudine by reduction of HIV-produced plaques in a HeLa cell line expressing CD-4 receptors. However the combination of ampligen and dideoxyinosine against HIV in MT-2 cells was only additive and not synergistic. 相似文献