全文获取类型
收费全文 | 9322篇 |
免费 | 437篇 |
国内免费 | 48篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 252篇 |
妇产科学 | 91篇 |
基础医学 | 1503篇 |
口腔科学 | 341篇 |
临床医学 | 830篇 |
内科学 | 1665篇 |
皮肤病学 | 112篇 |
神经病学 | 804篇 |
特种医学 | 804篇 |
外科学 | 1240篇 |
综合类 | 29篇 |
一般理论 | 1篇 |
预防医学 | 443篇 |
眼科学 | 69篇 |
药学 | 768篇 |
中国医学 | 23篇 |
肿瘤学 | 788篇 |
出版年
2023年 | 29篇 |
2022年 | 57篇 |
2021年 | 79篇 |
2020年 | 60篇 |
2019年 | 112篇 |
2018年 | 130篇 |
2017年 | 108篇 |
2016年 | 135篇 |
2015年 | 200篇 |
2014年 | 263篇 |
2013年 | 401篇 |
2012年 | 562篇 |
2011年 | 608篇 |
2010年 | 356篇 |
2009年 | 362篇 |
2008年 | 521篇 |
2007年 | 604篇 |
2006年 | 570篇 |
2005年 | 578篇 |
2004年 | 551篇 |
2003年 | 546篇 |
2002年 | 605篇 |
2001年 | 141篇 |
2000年 | 109篇 |
1999年 | 155篇 |
1998年 | 142篇 |
1997年 | 143篇 |
1996年 | 122篇 |
1995年 | 94篇 |
1994年 | 91篇 |
1993年 | 85篇 |
1992年 | 65篇 |
1991年 | 73篇 |
1990年 | 68篇 |
1989年 | 51篇 |
1988年 | 51篇 |
1987年 | 49篇 |
1986年 | 53篇 |
1985年 | 66篇 |
1984年 | 63篇 |
1983年 | 50篇 |
1982年 | 52篇 |
1981年 | 58篇 |
1980年 | 51篇 |
1979年 | 30篇 |
1978年 | 39篇 |
1977年 | 32篇 |
1976年 | 35篇 |
1975年 | 38篇 |
1974年 | 29篇 |
排序方式: 共有9807条查询结果,搜索用时 15 毫秒
51.
The disability rating index: An instrument for the assessment of disability in clinical settings 总被引:3,自引:0,他引:3
Bo A. Salen Erik V. Spangfortke L.Nygren Rolf Nordemar 《Journal of clinical epidemiology》1994,47(12):1423-1435
The purpose of this study was to evaluate an instrument for assessment of physical disability, mainly intended for clinical settings, the Disability Rating Index (DRI). Healthy persons (n = 1092), both white and blue collar workers, and patients (n = 366) with different levels of physical capacity, were assessed. Most of the patients (n = 303) underwent rehabilitation programmes for neck/shoulder/low-back pain but some (n = 47) were arthritis patients waiting for hip or knee replacement surgery, or wheelchair patients with multiple sclerosis (n = 16). The reliability was investigated by test-retest studies, intra- and inter-rater and internal consistency studies. Five construct validity tests were carried out: a discrimination study; a converging validity test; a test for sensitivity to small alterations in health status; and two correlational validity tests. Correlation of the self-reported DRI to the actual performance in similar activities was carried out. Responsiveness was tested by correlation of the DRI before/after replacement surgery for arthritis. The test-retest correlations were 0.83–0.95 in the studies, including correlation of different versions. The intra- and inter-rater reproducibility was 0.98 and 0.99 respectively. The Kruskal-Wallis test in the discrimination study yielded p < 0.0001. More than 90% of the respondents completed the questionnaire correctly. Correlation of the DRI to the Functional Status Questionnaire was 0.46. The responsiveness was excellent, p = 0.0001. The DRI proved to be a robust, practical clinical and research instrument with good responsiveness and acceptability for assessment of disability caused by impairment of common motor functions. 相似文献
52.
Rolf Inderbitzi Markus Furrer Christian Klaiber Hans Beat Ris Heinz Striffeler Ulrich Althaus 《Surgical endoscopy》1992,6(4):189-192
Summary Thoracoscopic surgery is decidedly expanded by the ability to perform pulmonary wedge resections of the lung by using the Endo-GIA-stapler. In addition to thoracoscopic biopsies, since July 1991 we have carried out wedge resections in 12 patients suffering from spontaneous pneumothorax (nine) or peripheral bronchial carcinoma (three). Postoperatively one air fistula persisted over 9 days. The chest tube was removed within 48 h in all other patients. There was no other major complication. The postoperative hospitalization period lasted 4.6 days (1–9 days). Operating time was 44 min (30–70 min). The benefit for the patient consists in the little-impaired breathing mechanics, the short hospital stay, and the favorable cosmetic result. 相似文献
53.
54.
55.
56.
57.
Radiologic long-term results after cervical vertebral interbody fusion with Polymethyl Methacrylat (PMMA) 总被引:4,自引:0,他引:4
Long-term results of cervical interbody fusion with PMMA were evaluated in a retrospective study. X-ray films of 83 patients were obtainable. Post-operative follow-up in this series was between 15 and 20 years. The results show that PMMA is engrafted after about 2 years. Stable vertebral interbody fusion is obtained in about 90% of cases. Development of malignoma was not observed. Resorptive bone alterations, which can be seen in about 2% of cases one to two years after operation are shown not to be progressive. This process heals and stable fusion develops. 相似文献
58.
Abstract: Elevated lipoprotein concentrations seem to be linked strongly in a dose dependent manner to an increased incidence of atherosclerosis. A total of 47 patients suffering from severe hyperlipidemia were matched to treatment with LDL apheresis (Baxter, Kaneka, Li–popak; 24 patients, aged 50.2 ±11.5 years), diet, and/or lipid–lowering drugs or with diet and lipid–lowering drugs only (23 patients, aged 48.8 ±11.8 years). After treatment periods of 49.8 ±13.4 months (apheresis group, 2,396 treatment sessions) and 38.6 ± 15.1 months (drug group), the ensuing results revealed significant differences (p <0.0001): –47.3% versus –12.1% for total cholesterol, –46.9% versus –21.8% for LDL, +8.4% versus +0.9% for HDL, –52.0% versus – 13.1% for the LDL/HDL ratio, –36.4% versus –16.2% for triglycerides, and –25.9% versus + 1.5% for lipoprotein (a). In the apheresis group, one patient died of myocardial infarction; in the drug group, there was one nonfatal myocardial infarction and the manifestation of coronary heart disease in 3 cases. There were no severe side effects in either group. All patients in the apheresis group responded to therapy. The present trial suggests that a continuing reduction in serum lipid concentrations may lower, in a dose dependent manner, the risk for development and progression of coronary heart disease. Regarding clinical and laboratory results, LDL apheresis seems to be safe, effective therapy for treatment of severe hyperlipidemia. 相似文献
59.
60.
Demetrius Moskophidis Elisabeth Laine Rolf M. Zinkernagel 《European journal of immunology》1993,23(12):3306-3311
Antiviral cytotoxic memory CD8+ T cells adoptively transferred to mice which are persistently infected with lymphocytic choriomeningitis virus WE or DOCILE initially proliferated extensively; they either caused the death of the recipient or, alternatively, disappeared within a few days. Apparently, the complete and coordinated induction and stimulation by widely distributed viral antigen caused these memory T cells to die before virus had been eliminated from the host. Thus memory T cells are as susceptible to peripheral exhaustion/deletion as unprimed T cells. These results indicate possible limitations of exclusively CD8+ T cell-mediated adoptive immunotherapy against viral infections or tumors. 相似文献