全文获取类型
收费全文 | 2048篇 |
免费 | 136篇 |
国内免费 | 45篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 95篇 |
妇产科学 | 26篇 |
基础医学 | 144篇 |
口腔科学 | 42篇 |
临床医学 | 284篇 |
内科学 | 325篇 |
皮肤病学 | 44篇 |
神经病学 | 75篇 |
特种医学 | 288篇 |
外科学 | 292篇 |
综合类 | 205篇 |
预防医学 | 139篇 |
眼科学 | 16篇 |
药学 | 117篇 |
2篇 | |
中国医学 | 32篇 |
肿瘤学 | 87篇 |
出版年
2022年 | 30篇 |
2021年 | 32篇 |
2020年 | 30篇 |
2018年 | 21篇 |
2017年 | 22篇 |
2016年 | 18篇 |
2015年 | 33篇 |
2014年 | 48篇 |
2013年 | 76篇 |
2012年 | 78篇 |
2011年 | 84篇 |
2010年 | 90篇 |
2009年 | 106篇 |
2008年 | 69篇 |
2007年 | 79篇 |
2006年 | 82篇 |
2005年 | 53篇 |
2004年 | 50篇 |
2003年 | 52篇 |
2002年 | 48篇 |
2001年 | 37篇 |
2000年 | 29篇 |
1999年 | 29篇 |
1998年 | 82篇 |
1997年 | 74篇 |
1996年 | 72篇 |
1995年 | 67篇 |
1994年 | 41篇 |
1993年 | 50篇 |
1991年 | 19篇 |
1990年 | 14篇 |
1989年 | 30篇 |
1988年 | 42篇 |
1987年 | 39篇 |
1986年 | 29篇 |
1985年 | 33篇 |
1984年 | 19篇 |
1983年 | 24篇 |
1982年 | 16篇 |
1980年 | 16篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1963年 | 17篇 |
1960年 | 14篇 |
1959年 | 22篇 |
1958年 | 29篇 |
1957年 | 19篇 |
1956年 | 30篇 |
1955年 | 42篇 |
1954年 | 35篇 |
排序方式: 共有2229条查询结果,搜索用时 15 毫秒
121.
Uterine leiomyomas in the infertile patient: preoperative localization with MR imaging versus US and hysterosalpingography 总被引:2,自引:0,他引:2
Eleven women with a history of infertility and uterine leiomyomas underwent magnetic resonance (MR) imaging of the pelvis prior to myomectomy. Nine also underwent preoperative pelvic ultrasonography (US), and ten underwent hysterosalpingography. All studies were interpreted prospectively by independent observers. With each imaging modality, the location (one of 11 anatomic segments), size, and appearance of detected uterine leiomyomas were determined and compared with surgical and histologic findings. Among the nine patients who underwent both MR and US, the sensitivity (85%) and accuracy (94%) of MR imaging for abnormal segments was significantly better than that of US (sensitivity = 69%, P = .015; accuracy = 87%, P = .043). For the ten patients who underwent both MR and hysterosalpingography, the sensitivity (91%) and accuracy (96%) of MR imaging was better than that of hysterosalpingography (sensitivity = 18%, P = .0005; accuracy = 72%, P = .0005). The specificities of the three modalities did not significantly differ (100%, 97%, and 98% for MR, US, and hysterosalpingography, respectively). These data suggest that MR imaging is superior to US or hysterosalpingography for preoperatively locating uterine leiomyomas. 相似文献
122.
123.
Blood donation-related neurologic needle injury: evaluation of 2 years' worth of data from a large blood center 总被引:2,自引:0,他引:2
BACKGROUND: There is little information in the medical literature on t he clinical spectrum of blood donation-related neurologic needle injury and on its frequency in a blood donor population. STUDY DESIGN AND METHODS: Sixty-six cases of blood donation-related neurologic needle injury were identified from nursing reports made during a 2-year collection period involving 419,000 whole blood donations. Telephone follow-up was completed on 56 of the 66 cases to better define clinical symptoms, the donor's desire for physician consultation, recovery times, and residual effects. RESULTS: Symptoms in 66 donors included numbness or tingling (n = 54), excessive or radiating pain (n = 43), and loss of arm or hand strength (n = 8). Of the 56 donors with complete follow-up, 17 (30%) consulted a physician one or more times. Recovery times in these 56 donors were <3 days (n = 22), 4 to 29 days (n = 17), 1 to 3 months (n = 13) 3 to 6 months (n = 2), and >6 months (n = 2). Fifty-two of 56 donors achieved a full recovery, and 4 other donors had only a mild, localized, residual numbness. The incidence of blood donation-related neurologic needle injury was 1 of every 6300 donations. CONCLUSION: While donor recovery may in some cases require a great deal of time and/or physician consultation(s), total recovery appears to be the rule. The incidence of blood donation-related neurologic needle injury is relatively low. 相似文献
124.
125.
Survey of reproductive health among female MR workers 总被引:6,自引:1,他引:5
126.
127.
128.
The incidence of HL-A antigens in dermatitis herpetiformis 总被引:2,自引:0,他引:2
A.G. WHITE R.St C. BARNETSON J.A.G. DA COSTA D.B.L. McCLELLAND 《The British journal of dermatology》1973,89(2):133-136
In dermatitis herpetiformis (DH) there are small intestinal abnormalities similar to those in adult coeliac disease (ACD) and there is evidence of other similarities between the two conditions, including immunological disturbances. Two reports of patients with ACD have shown a distinctive distribution of HL-A phenotypes, with a high incidence of HL-Ai and 8. A recent paper has described an increased incidence of HL-A8 in DH. We report a similar study of patients with DH. Twenty-one of thirty-five patients had HL-A8, an incidence of 60%, as compared to 33% of 175 controls. This difference is significant. The relationship of those patients with HL-A8 to those with abnormal jejunal biopsies, and also to those with circulating auto-antibodies, is discussed. 相似文献
129.
130.
Tu'meh SS; Tracy DA; Wynne J; Konstam MA; Kozlowski JF; Neumann AL; Holman BL 《Radiology》1982,145(2):463-466
The authors describe a simple technique for diagnosis of tricuspid regurgitation. Red blood cells were labeled in vivo with 99mTc and 22 patients were studied with ECG-gated blood-pool imaging of the liver. A single region of interest was manually drawn around the liver and a time-activity curve obtained. The per cent change in liver counts during the cardiac cycle was found to be significantly higher in the 12 patients with tricuspid regurgitation (Group I) (mean, 4.04 +/- 1.6%; range, 1.3-21.4%) compared with the 10 controls (Group II) (mean, 0.35 +/- 0.16%; range, 0.013-1.3%) (p less than 0.05). Using a 1% change in liver counts as the criterion of a positive study, all 12 cases in Group I were diagnosed correctly, but there was one false positive in Group II; thus the sensitivity was 100% and the specificity 90%. 相似文献