全文获取类型
收费全文 | 1450457篇 |
免费 | 118903篇 |
国内免费 | 3423篇 |
专业分类
耳鼻咽喉 | 18753篇 |
儿科学 | 48168篇 |
妇产科学 | 42192篇 |
基础医学 | 205838篇 |
口腔科学 | 38142篇 |
临床医学 | 131563篇 |
内科学 | 291697篇 |
皮肤病学 | 34220篇 |
神经病学 | 121054篇 |
特种医学 | 54646篇 |
外国民族医学 | 464篇 |
外科学 | 214878篇 |
综合类 | 33147篇 |
现状与发展 | 4篇 |
一般理论 | 570篇 |
预防医学 | 116112篇 |
眼科学 | 32219篇 |
药学 | 101464篇 |
1篇 | |
中国医学 | 3402篇 |
肿瘤学 | 84249篇 |
出版年
2021年 | 12291篇 |
2019年 | 13157篇 |
2018年 | 18144篇 |
2017年 | 13889篇 |
2016年 | 15571篇 |
2015年 | 17354篇 |
2014年 | 24453篇 |
2013年 | 35930篇 |
2012年 | 49123篇 |
2011年 | 51656篇 |
2010年 | 30217篇 |
2009年 | 28736篇 |
2008年 | 47241篇 |
2007年 | 49769篇 |
2006年 | 50132篇 |
2005年 | 48424篇 |
2004年 | 45931篇 |
2003年 | 43560篇 |
2002年 | 41806篇 |
2001年 | 73204篇 |
2000年 | 74664篇 |
1999年 | 61763篇 |
1998年 | 17262篇 |
1997年 | 15619篇 |
1996年 | 15741篇 |
1995年 | 14929篇 |
1994年 | 13499篇 |
1993年 | 12663篇 |
1992年 | 45902篇 |
1991年 | 43537篇 |
1990年 | 41539篇 |
1989年 | 39607篇 |
1988年 | 36227篇 |
1987年 | 35386篇 |
1986年 | 32891篇 |
1985年 | 31308篇 |
1984年 | 23871篇 |
1983年 | 20067篇 |
1982年 | 12229篇 |
1981年 | 10803篇 |
1979年 | 20716篇 |
1978年 | 14600篇 |
1977年 | 12102篇 |
1976年 | 11383篇 |
1975年 | 11646篇 |
1974年 | 14000篇 |
1973年 | 13555篇 |
1972年 | 12652篇 |
1971年 | 11479篇 |
1970年 | 10921篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
D L Renfrew G Y el-Khoury T E Moore M H Kathol C G Whitten C W Walker M A Fraser-Hill 《Investigative radiology》1991,26(11):1019-1023
Although general suggestions have been made regarding a radiology residency curriculum, no specific list of entities has been offered. Over the past ten years, we have developed a resident-run morning conference in musculoskeletal radiology that is supervised by faculty and covers a specific curriculum. We offer our curriculum as an example that may assist other departments in developing their own curricula. 相似文献
992.
Lumbar subarachnoid catheterization in rats 总被引:3,自引:0,他引:3
An animal model was developed for the study of subarachnoid (spinal) anesthesia and analgesia under unanesthetized, unsedated and unrestrained conditions. Sprague-Dawley rats were anesthetized with intraperitoneal ketamine (75-100 mg.kg-1). A PE10 catheter was inserted under direct vision into the lumbar subarachnoid space, through partial laminectomy of L1 or L2 with or without removal of adjacent intervertebral ligament. One week after surgery, correct position of the catheter was verified by subarachnoid injection of 0.03-0.05 ml of 1.5% lidocaine, which produced temporary hind limb paralysis in all but one animal in 28 consecutive operations. There was neither mortality nor major complication, intraoperatively or postoperatively. Only 2 animals developed minor subcutaneous would infections which responded to incision, drainage and debridement. 相似文献
993.
C P Baveja D Chattopadhya S Kumari K K Dutta S Sehgal 《The Journal of communicable diseases》1989,21(1):59-61
Sixty drinking water samples collected from various sources in different areas of Delhi during epidemic of cholera and gastroenteritis were analysed for bacteriological standards. Only 27 (45 per cent) samples were found to be satisfactory for human consumption. Remaining thirty-three (55 per cent) samples showed presence of coliform organisms with MPN value ranging from 10 to 1800+ per 100 ml. Among these positive samples, 31 (93.9 per cent) samples contained faecal coli. Twenty out of thirty (66.6 per cent) Hand pump, 9 out of 21 (42.8 per cent) Taps 2 out of 4 (50 per cent) Tube well and 2 out of 5 (40 per cent) of miscellaneous sources showed contamination with coliform organisms. 相似文献
994.
995.
996.
997.
998.
Rifampin alone or with trimethoprim for contacts of children with Haemophilus influenzae type b infections. 总被引:1,自引:0,他引:1 下载免费PDF全文
T Jadavji R Cheung R M Bannatyne C G Prober 《Canadian Medical Association journal》1986,135(4):328-331
We carried out a nonrandomized, unblinded study to compare the efficacy of rifampin alone with that of rifampin in combination with trimethoprim in the eradication of the Haemophilus influenzae type b (HIB) carrier state among contacts of patients with invasive HIB infection. The study population comprised 17 index patients admitted to hospital with severe HIB infections and 233 contacts, 43 of whom had nasopharyngeal colonization with HIB of the same biotype as that of the index patient. Rifampin in a daily dose of 20 mg/kg (maximum 600 mg) for 4 days eradicated the carrier state in 86% of cases, as did the combination of rifampin at the same dosage and trimethoprim in a daily dose of 5 mg/kg (maximum 160 mg) for 4 days. 相似文献
999.
1000.
Xiaoguang Chen Yi Li Lei Wang Mark Katakowski Lijie Zhang Jieli Chen Yongxian Xu Subhash C. Gautam Michael Chopp 《Neuropathology》2002,22(4):275-279
Intravenous administration of human bone marrow stromal cells (hMSCs) after middle cerebral artery occlusion (MCAo) in rats provides functional benefit. We tested the hypothesis that these functional benefits are derived in part from hMSC production of growth and trophic factors. Quantitative sandwich enzyme‐linked immunosorbent assay (ELISA) of hMSCs cultured with normal and MCAo brain extracts were performed. hMSCs cultured in supernatant derived from ischemic brain extracts increased production of brain‐derived neurotrophic factor (BDNF), nerve growth factor (NGF), vascular endothelial growth factor (VEGF) and hepatocyte growth factor (HGF). These neurotrophins and angiogenic growth factors increased in a post‐ischemia time‐dependent manner. The hMSC capacity to increase expression of growth and trophic factors may be the key to the benefit provided by transplanted hMSCs in the ischemic brain. 相似文献