全文获取类型
收费全文 | 37079篇 |
免费 | 2135篇 |
国内免费 | 201篇 |
专业分类
耳鼻咽喉 | 425篇 |
儿科学 | 1151篇 |
妇产科学 | 997篇 |
基础医学 | 3687篇 |
口腔科学 | 1210篇 |
临床医学 | 3251篇 |
内科学 | 7999篇 |
皮肤病学 | 671篇 |
神经病学 | 2209篇 |
特种医学 | 1313篇 |
外国民族医学 | 4篇 |
外科学 | 6771篇 |
综合类 | 854篇 |
现状与发展 | 3篇 |
一般理论 | 27篇 |
预防医学 | 2498篇 |
眼科学 | 1355篇 |
药学 | 2854篇 |
1篇 | |
中国医学 | 266篇 |
肿瘤学 | 1869篇 |
出版年
2024年 | 39篇 |
2023年 | 414篇 |
2022年 | 1051篇 |
2021年 | 1642篇 |
2020年 | 983篇 |
2019年 | 1255篇 |
2018年 | 1566篇 |
2017年 | 1136篇 |
2016年 | 1232篇 |
2015年 | 1329篇 |
2014年 | 1681篇 |
2013年 | 2048篇 |
2012年 | 3095篇 |
2011年 | 2992篇 |
2010年 | 1688篇 |
2009年 | 1462篇 |
2008年 | 2221篇 |
2007年 | 2291篇 |
2006年 | 2020篇 |
2005年 | 1788篇 |
2004年 | 1622篇 |
2003年 | 1348篇 |
2002年 | 1177篇 |
2001年 | 363篇 |
2000年 | 306篇 |
1999年 | 280篇 |
1998年 | 197篇 |
1997年 | 132篇 |
1996年 | 141篇 |
1995年 | 107篇 |
1994年 | 95篇 |
1993年 | 77篇 |
1992年 | 147篇 |
1991年 | 160篇 |
1990年 | 128篇 |
1989年 | 123篇 |
1988年 | 104篇 |
1987年 | 97篇 |
1986年 | 88篇 |
1985年 | 116篇 |
1984年 | 77篇 |
1983年 | 52篇 |
1982年 | 53篇 |
1981年 | 55篇 |
1980年 | 41篇 |
1979年 | 50篇 |
1978年 | 40篇 |
1975年 | 35篇 |
1974年 | 36篇 |
1973年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Jens Toft Birger Hesse Alan Rabøl Steen Carstensen Samir Ali 《European journal of nuclear medicine and molecular imaging》1997,24(4):409-414
Reference data files support the evaluation of myocardial perfusion single-photon emission tomography (SPET). The aim of this study was to create a large reference data base for technetium-99m sestamibi SPET, age and gender matched to the general patient population. One hundred and twenty-eight healthy volunteers (76 males and 52 females) with a likelihood of coronary artery disease of less than 5% underwent rest and maximal exercise99mTc-sestamibi SPET with a 2-day protocol and 180° elliptical rotation. The normalized activity values of99mTc-sestamibi in the inferior wall differed significantly between men and women. Age variations were found for men in the anterior wall. Normalized activity values in all four walls were strikingly similar during rest and stress. Our results suggest that the use of reference files in99mTc-sestamibi SPET requires a gender- and, for males, possibly an age-matched reference population. Different reference files at rest and during stress might not be necessary. 相似文献
32.
Neonatal septicaemia (NNS) is a major cause of neonatal morbidity and mortality. Neonatal septicaemia was studied to determine the incidence, common bacterial aetiology and antibiotic susceptibility in Qatif Central Hospital, Saudi Arabia. Of 1,797 babies admitted into the unit over a 3 year period, 144 (8.0%) had documented neonatal septicaemia consisting of 94 (65%) late onset and 50 (35%) early onset septicaemia. The incidence was 8.2/1000 of the total live births in the hospital.
Gram negative bacteria were encountered in 66.2%, gram positive bacteria in 29.2% and Candida albicans in 4.4% of the case. Klebsiella spp., E. coli, and Pseudomonas accounted for 81.8 % of the gram negative while Staphylococcus epidermidis, Staphylococcus aureus and group B Beta haemolytic Streptococcus accounted for 73.9% of the gram positive bacteria.
Most of Gram negative bacteria had a high sensitivity to Aminoglycosides and third generation Cephalosporins. Coagulase negative staphylococci were frequently resistant to most antibiotics but always sensitive to Vancomycin. The overall mortality rate was 18.7%. 相似文献
Gram negative bacteria were encountered in 66.2%, gram positive bacteria in 29.2% and Candida albicans in 4.4% of the case. Klebsiella spp., E. coli, and Pseudomonas accounted for 81.8 % of the gram negative while Staphylococcus epidermidis, Staphylococcus aureus and group B Beta haemolytic Streptococcus accounted for 73.9% of the gram positive bacteria.
Most of Gram negative bacteria had a high sensitivity to Aminoglycosides and third generation Cephalosporins. Coagulase negative staphylococci were frequently resistant to most antibiotics but always sensitive to Vancomycin. The overall mortality rate was 18.7%. 相似文献
33.
34.
35.
36.
Medium-Depth Chemical Peels in the Treatment of Acne Scars in Dark-Skinned Individuals 总被引:2,自引:0,他引:2
BACKGROUND: Multiple modalities are available for treating acne scars, one of which is chemical peeling. OBJECTIVE: To evaluate the efficacy of medium-depth peels in the treatment of acne scars. METHODS: A total of 15 patients (14 women and 1 man) were seen between November 1998 and March 2000. A medium-depth chemical peel was performed. The peel was performed using a combination of Jessner's solution followed by the application of 35% trichloroacetic acid (TCA). The mean age of patients who entered the study was 28 years. A total of 42 peeling sessions were performed: 13 patients had the full three-session regiment, 1 patient had two sessions, and 1 had only one session. RESULTS: Patients in our study had two forms of acne scars, the atrophic saucer or crater-like form and the pitted (ice-pick) form. Improvement occurred in all except one of our patients. Significant improvement (greater than 75% clearance of lesions) occurred in 1 patient (6.6%), moderate improvement (51-75% clearance) in 8 patients (53.3%), mild improvement (26-50% clearance) in 4 patients (26.6%), minimal improvement (1-25% clearance) in 1 patient (6.6%), and no response in 1 patient (6.6%). All patients had different combinations of the above two forms. Four patients (26.6%) had mainly pitted scars and deep atrophic scars. The clinical response in those patients was moderate, mild, minimal, and no response, respectively. The remainder of our patients had mainly atrophic scars of moderate depth. Nine patients (73.4%) suffered from transient postinflammatory hyperpigmentation. In two of them it was preceded by erythema that lasted for more than 1 month. All patients were free of noticeable pigmentation 3 months after the final peel. Patients in whom hyperpigmentation did not develop were of light brown complexion. CONCLUSION: We conclude that medium-depth chemical peel is a safe and effective method of treating acne scars even in patients with dark complexion. 相似文献
37.
Background
Given the proliferation and the growing complexity of performance measurement initiatives in many health systems, the Netherlands and Ontario, Canada expressed interests in cross-national comparisons in an effort to promote knowledge transfer and best practise. To support this cross-national learning, a study was undertaken to compare health system performance approaches in The Netherlands with Ontario, Canada. 相似文献38.
39.
40.
Ali Samii Debra D Dahlen Alexander M Spence Nicole C Maronian Eric E Kraus Vanda A Lennon 《Movement disorders》2003,18(12):1556-1558
The paraneoplastic autoantibody, collapsin response-mediator protein (CRMP)-5 immunoglobulin G (IgG), is specific for neuronal cytoplasmic CRMP-5, and is usually associated with small-cell lung carcinoma or thymoma. We report on details of a movement disorder that followed anti-B-cell therapy in a patient with lymphoma, and was accompanied by CRMP-5 IgG. 相似文献