全文获取类型
收费全文 | 1360篇 |
免费 | 87篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 95篇 |
妇产科学 | 13篇 |
基础医学 | 113篇 |
口腔科学 | 31篇 |
临床医学 | 192篇 |
内科学 | 286篇 |
皮肤病学 | 23篇 |
神经病学 | 36篇 |
特种医学 | 333篇 |
外科学 | 92篇 |
综合类 | 17篇 |
预防医学 | 58篇 |
眼科学 | 13篇 |
药学 | 49篇 |
肿瘤学 | 104篇 |
出版年
2021年 | 13篇 |
2019年 | 13篇 |
2018年 | 18篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 22篇 |
2014年 | 24篇 |
2013年 | 34篇 |
2012年 | 24篇 |
2011年 | 28篇 |
2010年 | 48篇 |
2009年 | 35篇 |
2008年 | 18篇 |
2007年 | 36篇 |
2006年 | 29篇 |
2005年 | 29篇 |
2004年 | 27篇 |
2003年 | 17篇 |
2002年 | 19篇 |
2001年 | 20篇 |
2000年 | 17篇 |
1999年 | 27篇 |
1998年 | 98篇 |
1997年 | 69篇 |
1996年 | 79篇 |
1995年 | 55篇 |
1994年 | 56篇 |
1993年 | 62篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 16篇 |
1989年 | 47篇 |
1988年 | 31篇 |
1987年 | 48篇 |
1986年 | 24篇 |
1985年 | 32篇 |
1984年 | 27篇 |
1983年 | 18篇 |
1982年 | 25篇 |
1981年 | 25篇 |
1980年 | 34篇 |
1979年 | 11篇 |
1978年 | 22篇 |
1977年 | 22篇 |
1976年 | 27篇 |
1975年 | 20篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1970年 | 7篇 |
1967年 | 7篇 |
排序方式: 共有1458条查询结果,搜索用时 15 毫秒
1.
Needle-localized breast biopsy: why do we fail? 总被引:10,自引:0,他引:10
2.
3.
Ketai LH; Williamson MR; Telepak RJ; Levy H; Koster FT; Nolte KB; Allen SE 《Radiology》1994,191(3):665
4.
5.
荧光原位杂交技术分析人结肠菌群方法研究 总被引:2,自引:0,他引:2
建立荧光原位杂交技术分析人体内结肠菌群的方法。取受试者新鲜粪便 ,选用 5种特异性的 16SrRNA寡核苷酸探针 ,检测粪便样本收集后的保存时间、温度 ,离心条件及样本固定液存放时间对杂交计数结果的影响。结果建立最佳实验条件为 :粪便样本收集后应尽快在 4℃下保存 ,放置时间不要超过 12小时即作处理 ;样本的适宜离心条件为 70 0g 2分钟 ;样本用多聚甲醛固定后在 - 80℃下存放时间不要超过 5个月。该方法具有较好的稳定性 ,可以有效地检出个体之间结肠菌群的差异。 相似文献
6.
7.
Brendan M McGuire Herbert L Bonkovsky Robert L Carithers Raymond T Chung Leonard I Goldstein John R Lake Anna S Lok Carol J Potter Elizabeth Rand Michael D Voigt Pamela R Davis Joseph R Bloomer 《Liver transplantation》2005,11(12):1590-1596
In erythropoietic protoporphyria (EPP), there is excessive production of protoporphyrin, primarily in the bone marrow, resulting in increased biliary excretion of this heme precursor. Some patients will develop progressive liver disease that may ultimately require liver transplantation. However, excessive production of protoporphyrin by the bone marrow continues after transplantation, which may cause recurrent disease in the allograft. This study was performed to define post-transplant survival, the risk of recurrent disease, and specific management issues in patients transplanted for EPP liver disease. The patients studied consisted of twelve males and eight females, with an average age of 31 (range, 13-56) years at the time of transplantation. The estimated maximum MELD score prior to transplant was 21 (range, 15-29). Unique complications in the perioperative period were light induced tissue damage in four patients and neuropathy in six, requiring prolonged mechanical ventilation in four. Patient and graft survival rates were 85% at 1 year, 69% at 5 years, and 47% at 10 years. Recurrent EPP liver disease occurred in 11 of 17 patients (65%) who survived more than 2 months. Three patients were retransplanted at 1.8, 12.6, and 14.5 years after the initial transplant for recurrent EPP liver disease. In conclusion, the 5-year patient survival rate in patients transplanted for EPP liver disease is good, but the recurrence of EPP liver disease appears to diminish long term graft and patient survival. 相似文献
8.
Richard J. Bloomer Andrew C. Fry Michael J. Falvo Christopher A. Moore 《Journal of Science and Medicine in Sport》2007,10(6):411-417
The purpose of this investigation was to determine if a single set of strenuous squat exercise would result in an acute oxidative stress, as demonstrated previously by a single sprint. Thirteen resistance trained men performed one set of 15 repetitions of barbell squats using 70% of one repetition maximum and a 30 s maximal cycle sprint on two different occasions. The total work performed was calculated for each exercise bout. Heart rate, perceived exertion, blood lactate, protein carbonyls, 8-hydroxydeoxyguanosine, and malondialdehyde were measured before and within 1 min following exercise. No differences were noted between the squat and sprint tests for total work, heart rate or perceived exertion. An exercise test by time interaction was evident for blood lactate with values greater following sprinting compared to squatting (P = 0.0005). Postexercise protein carbonyls were not different between exercise tests but were elevated above rest (P = 0.04) by 111% and 74% following sprinting and squatting, respectively, while 8-hydroxydeoxyguanosine and malondialdehyde were relatively unaffected by either exercise test. These data indicate that a single bout of strenuous squatting and sprinting performed by resistance trained men results in elevated protein carbonyls, while having little impact on 8-hydroxydeoxyguanosine or malondialdehyde during the immediate postexercise period. 相似文献
9.
10.