全文获取类型
收费全文 | 1269篇 |
免费 | 162篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 101篇 |
妇产科学 | 18篇 |
基础医学 | 110篇 |
口腔科学 | 44篇 |
临床医学 | 108篇 |
内科学 | 380篇 |
皮肤病学 | 29篇 |
神经病学 | 23篇 |
特种医学 | 206篇 |
外科学 | 107篇 |
综合类 | 100篇 |
预防医学 | 82篇 |
眼科学 | 10篇 |
药学 | 73篇 |
中国医学 | 3篇 |
肿瘤学 | 77篇 |
出版年
2024年 | 3篇 |
2023年 | 16篇 |
2022年 | 13篇 |
2021年 | 33篇 |
2020年 | 29篇 |
2019年 | 13篇 |
2018年 | 28篇 |
2017年 | 51篇 |
2016年 | 47篇 |
2015年 | 37篇 |
2014年 | 75篇 |
2013年 | 82篇 |
2012年 | 34篇 |
2011年 | 31篇 |
2010年 | 73篇 |
2009年 | 75篇 |
2008年 | 37篇 |
2007年 | 74篇 |
2006年 | 41篇 |
2005年 | 33篇 |
2004年 | 23篇 |
2003年 | 13篇 |
2002年 | 10篇 |
2001年 | 29篇 |
2000年 | 14篇 |
1999年 | 20篇 |
1998年 | 79篇 |
1997年 | 64篇 |
1996年 | 59篇 |
1995年 | 50篇 |
1994年 | 47篇 |
1993年 | 42篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 16篇 |
1989年 | 22篇 |
1988年 | 24篇 |
1987年 | 13篇 |
1986年 | 19篇 |
1985年 | 17篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 4篇 |
1980年 | 8篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 12篇 |
1975年 | 9篇 |
排序方式: 共有1480条查询结果,搜索用时 15 毫秒
31.
Corticosteroids have the ability to suppress the production of growth factors and cytokines and are thus implicated in the negative regulation of hematopoiesis. We have shown that the corticosteroids, prednisolone and dexamethasone, were able to effectively protect progenitor cells in four strains of mice against cell-cycle-specific antimetabolic chemotherapy agents. The highest levels of protection against 5-fluorouracil (FU; 200 mg/kg) were achieved when two or three intraperitoneal injections of dexamethasone were administered between - 7 and +3 hours at a dose of 7.5 mg/kg/injection (optimal dose) or by continuous infusion between -4 and +20 hours. This protective effect is manifested as an increase in the number of high proliferative potential colony-forming cells that survive in the bone marrow 3 days after treatment with FU from between 0.5% and 11% to between 10% and 34% of normal. The bone marrow progenitors and blood cell numbers return to normal from 3 to 5 days and 1 to 2 days earlier, respectively. Less dexamethasone than prednisolone is required to give an equivalent protective effect, which is consistent with their anti-inflammatory potency. These findings are further evidence of the negative regulatory role played by corticosteroids, and indicate that the treatment schedules of corticosteroids during cancer therapy need to be reexamined to obtain the maximum benefit from their use. 相似文献
32.
33.
34.
Procedural variation in the performance of primary percutaneous coronary intervention for ST‐elevation myocardial infarction: A SCAI‐based survey study of US interventional cardiologists 下载免费PDF全文
Austin Chiang MD Hemal Gada MD MBA Susheel K. Kodali MD Michael S. Lee MD Allen Jeremias MD Duane S. Pinto MD MPH Sripal Bangalore MD MHA Robert W. Yeh MD MSc Timothy D. Henry MD Georgina Lopez‐Cruz BS MSHA Roxana Mehran MD Ajay J. Kirtane MD SM 《Catheterization and cardiovascular interventions》2014,83(5):721-726
35.
36.
37.
38.
B. Lundin M. L. Manco‐Johnson D. M. Ignas R. Moineddin V. S. Blanchette A. L. Dunn S. V. Gibikote S. N. Keshava R. Ljung M. J. Manco‐Johnson S. F. Miller G. E. Rivard A. S. Doria The International Prophylaxis Study Group 《Haemophilia》2012,18(6):962-970
Evaluation of prophylactic treatment of haemophilia requires sensitive methods. To design and test a new magnetic resonance imaging (MRI) scale for haemophilic arthropathy, two scales of a combined MRI scoring scheme were merged into a single scale which includes soft tissue and osteochondral subscores. Sixty‐one joint MRI's of 46 patients with haemophilia were evaluated by four radiologists using the new and older scales. Forty‐six of the joints were evaluated using two X‐ray scales. For all MRI scores, interreader agreement and correlations with X‐ray scores and lifetime number of haemarthroses were analysed. The interreader agreement intraclass correlation coefficient was 0.82, 0.89 and 0.88 for the soft tissue and osteochondral subscores and the total score, as evaluated according to the new MRI scale, compared to 0.80 and 0.89 as for the older scales. The total score and osteochondral subscore according to the new scale, as well as scores according to the older scales were correlated (P < 0.01) with number of haemarthroses (Spearman correlation 0.35–0.68) and with the X‐ray scores (Spearman correlation 0.40–0.76), but no correlation (P > 0.05) was found between the soft tissue subscore of the new MRI scale and the X‐ray scores. The new MRI scale is simpler to apply than the older and has similar reader reliability and correlation with lifetime number of haemarthroses, and by separating soft tissue and osteochondral changes it gives additional information. The new scale is useful for analyses of early and moderate stages of arthropathy, and may help to evaluate prophylactic haemophilia treatment. 相似文献
39.
40.