全文获取类型
收费全文 | 1113篇 |
免费 | 61篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 86篇 |
妇产科学 | 10篇 |
基础医学 | 100篇 |
口腔科学 | 26篇 |
临床医学 | 133篇 |
内科学 | 241篇 |
皮肤病学 | 19篇 |
神经病学 | 33篇 |
特种医学 | 306篇 |
外科学 | 85篇 |
综合类 | 11篇 |
预防医学 | 33篇 |
眼科学 | 8篇 |
药学 | 32篇 |
肿瘤学 | 60篇 |
出版年
2021年 | 8篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 14篇 |
2017年 | 3篇 |
2016年 | 7篇 |
2015年 | 16篇 |
2014年 | 18篇 |
2013年 | 22篇 |
2012年 | 10篇 |
2011年 | 12篇 |
2010年 | 28篇 |
2009年 | 26篇 |
2008年 | 12篇 |
2007年 | 29篇 |
2006年 | 19篇 |
2005年 | 23篇 |
2004年 | 23篇 |
2003年 | 10篇 |
2002年 | 15篇 |
2001年 | 11篇 |
2000年 | 8篇 |
1999年 | 22篇 |
1998年 | 96篇 |
1997年 | 69篇 |
1996年 | 77篇 |
1995年 | 52篇 |
1994年 | 54篇 |
1993年 | 61篇 |
1992年 | 14篇 |
1991年 | 12篇 |
1990年 | 17篇 |
1989年 | 47篇 |
1988年 | 26篇 |
1987年 | 38篇 |
1986年 | 24篇 |
1985年 | 31篇 |
1984年 | 23篇 |
1983年 | 17篇 |
1982年 | 23篇 |
1981年 | 24篇 |
1980年 | 28篇 |
1979年 | 8篇 |
1978年 | 19篇 |
1977年 | 20篇 |
1976年 | 21篇 |
1975年 | 15篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1972年 | 4篇 |
排序方式: 共有1185条查询结果,搜索用时 0 毫秒
991.
The aim of this study was to assess prospectively the relationship of a hiatal hernia to gastro-oesophageal reflux. Ninety five children with symptoms of gastro-oesophageal reflux in whom reflux was demonstrated radiologically were investigated. Oesophageal pH monitoring for 18 hours and endoscopy were performed in all patients. On the basis of radiology, patients were divided into those with hiatal hernia (n = 37) and those without (n = 58). Both groups had the same number of reflux episodes on pH monitoring. However, the median duration of the longest episode was significantly greater in the hiatal hernia group (30 min v 19 min), as was the number of reflux episodes longer than five minutes (5 v 4). The percentage with a pH < 4 just failed to be significantly different (13% v 8%). Hiatal hernia was also found to correlate with the presence of oesophagitis. The presence of a hiatal hernia delays the clearance of acid from the oesophagus and is associated with an increased incidence of oesophagitis. 相似文献
992.
Salmon calcitonin nasal spray in the prevention of corticosteroid- induced osteoporosis 总被引:5,自引:0,他引:5
Adachi JD; Bensen WG; Bell MJ; Bianchi FA; Cividino AA; Craig GL; Sturtridge WC; Sebaldt RJ; Steele M; Gordon M; Themeles E; Tugwell P; Roberts R; Gent M 《Rheumatology (Oxford, England)》1997,36(2):255-259
The objectives were to determine the efficacy and safety of nasal salmon
calcitonin 200 IU daily in the prevention of corticosteroid- induced
osteoporosis. A minimized, double-blind, placebo-controlled trial was
carried out in corticosteroid-treated patients with polymyalgia rheumatica.
The setting was a tertiary care university- affiliated hospital and a total
of 31 patients were enrolled. The primary outcome measure was the
percentage change in bone mineral density of the lumbar spine in the two
treatment groups from baseline to 1 yr of follow-up. The mean +/- S.D. bone
mineral density of the lumbar spine in the calcitonin-treated group
decreased by 1.29 +/- 6.76% and in the placebo group by 4.95 +/- 3.50%
after 12 months. The observed difference of 3.65 +/- 2.10% between groups
is statistically significant (P < 0.05). Nasal salmon calcitonin
prevented loss of bone in the lumbar spine as measured by dual-energy X-ray
absorptiometry.
相似文献
993.
994.
995.
N Acciarri G Giuliani M Poppi A Paolo Fabrizi R Ferracini 《The Journal of foot surgery》1990,29(3):231-232
The authors describe an intraneural ganglion of the sural nerve at the ankle. This cause for sural neuropathy has never previously been cited. Resection of the sural nerve together with the indwelling cyst is suggested. 相似文献
996.
997.
DW Beverley RJ Ball RA Smith MJ Harran GM Durrans S Keenan J Smith B Durack 《Archives of disease in childhood》1997,77(4):287-92; discussion 292-3
A paediatric day assessment unit was opened in May 1995. An audit of the first year's activity showed that, despite an increase in emergency admissions of 8.4%, the number of children admitted as an emergency overnight was reduced by 3% in paediatrics and 7.2% in surgery. In the first year, 1731 children were assessed as an emergency of whom 658 did not require admission to the inpatient ward. Midnight occupancy fell 17.7% in paediatrics and 25.4% in surgery. The nurse staffing costs fell over Pounds 32,000 in the first year. No adverse events occurred during the first year of operation; this type of facility could lead to a more efficient use of resources in any children's unit. 相似文献
998.
999.
Cholangiocarcinoma complicating primary sclerosing cholangitis: cholangiographic appearances 总被引:1,自引:0,他引:1
MacCarty RL; LaRusso NF; May GR; Bender CE; Wiesner RH; King JE; Coffey RJ 《Radiology》1985,156(1):43-46
Cholangiograms from 104 patients (and serial cholangiograms in 66 patients) with primary sclerosing cholangitis (PSC) were reviewed. In 13 patients the additional diagnosis of cholangiocarcinoma was made at biopsy or autopsy. Cholangiograms from patients with both PSC and carcinoma were compared with cholangiograms from patients with PSC alone. Marked dilatation of ducts or ductal segments (100% vs. 24%) and the appearance of a polypoid mass (46% vs. 7%) were common findings in the group of patients whose disease was complicated by malignancy. In the malignant group, polypoid masses were larger, measuring 1 cm or greater in diameter. On serial cholangiograms, four of 15 patients with progressive stricture formation and four of five with progressive ductal dilatation proved to have carcinomas. The frequent occurrence of bile duct carcinoma as a complication of PSC in this group of patients indicates that PSC has a strong tendency to undergo malignant degeneration. Cholangiographic findings which suggest malignant degeneration include markedly dilated ducts or ductal segments, presence of a polypoid mass 1 cm or greater in diameter, and progressive stricture formation or ductal dilatation. 相似文献
1000.
Multi-section multi-echo pulse magnetic resonance techniques: optimization in a clinical setting 总被引:1,自引:0,他引:1
The user-selectable magnetic resonance imaging parameters involved in a multi-section multi-echo pulse sequence are described and their interrelationships explained. These parameters include repetition time (TR), echo delay time (TE), the number of sections (S), the number of echoes (E'), the time from the center of the last echo to the end of data acquisition (15 msec on the authors' system), and the time for T1 recovery. A simple mathematical relationship among these quantities, permitting easy calculation of the remaining parameters once a sufficient number have been specified, is given. In addition, a nomogram that permits rapid visual estimation of these parameters is presented. The effects of these choices and others is explained with respect to imaging time, region covered, and image contrast. Finally, the inherent trade-offs are illustrated in a clinical example involving the pelvis. 相似文献