全文获取类型
收费全文 | 27930篇 |
免费 | 2226篇 |
国内免费 | 65篇 |
专业分类
耳鼻咽喉 | 229篇 |
儿科学 | 914篇 |
妇产科学 | 762篇 |
基础医学 | 3655篇 |
口腔科学 | 569篇 |
临床医学 | 2836篇 |
内科学 | 6360篇 |
皮肤病学 | 467篇 |
神经病学 | 2175篇 |
特种医学 | 1017篇 |
外国民族医学 | 3篇 |
外科学 | 4450篇 |
综合类 | 440篇 |
一般理论 | 27篇 |
预防医学 | 2366篇 |
眼科学 | 800篇 |
药学 | 1606篇 |
1篇 | |
中国医学 | 20篇 |
肿瘤学 | 1524篇 |
出版年
2022年 | 184篇 |
2021年 | 433篇 |
2020年 | 273篇 |
2019年 | 445篇 |
2018年 | 598篇 |
2017年 | 432篇 |
2016年 | 425篇 |
2015年 | 499篇 |
2014年 | 725篇 |
2013年 | 1017篇 |
2012年 | 1630篇 |
2011年 | 1623篇 |
2010年 | 945篇 |
2009年 | 827篇 |
2008年 | 1444篇 |
2007年 | 1486篇 |
2006年 | 1529篇 |
2005年 | 1491篇 |
2004年 | 1438篇 |
2003年 | 1337篇 |
2002年 | 1308篇 |
2001年 | 616篇 |
2000年 | 567篇 |
1999年 | 507篇 |
1998年 | 291篇 |
1997年 | 282篇 |
1996年 | 254篇 |
1995年 | 212篇 |
1994年 | 215篇 |
1993年 | 231篇 |
1992年 | 445篇 |
1991年 | 457篇 |
1990年 | 373篇 |
1989年 | 399篇 |
1988年 | 365篇 |
1987年 | 372篇 |
1986年 | 350篇 |
1985年 | 298篇 |
1984年 | 265篇 |
1983年 | 267篇 |
1982年 | 197篇 |
1981年 | 205篇 |
1980年 | 195篇 |
1979年 | 282篇 |
1978年 | 223篇 |
1977年 | 183篇 |
1976年 | 152篇 |
1975年 | 170篇 |
1974年 | 180篇 |
1973年 | 169篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
Bernard Stuart Declan Fox Harry Murphy Bryan Lynch J. Loftus E. Naughten I. Saul O. Sheil N. Duignan A. Jackson W. A. Gorman G. Fox T. Matthews T. Clarke Mark M. Reid H. L. Halliday B. G. McClure P. S. Thomas Michael O’Dowd Michael J. O’Dowd Kevin Connolly F. Leahy Dr. R. G. White Ruth Connolly Colm O’Herlihy Alicja Radic Dr. 《Irish journal of medical science》1986,155(6):209-212
43.
We have prospectively evaluated the skin changes that occurred in ten patients who were undergoing immunotherapy with interleukin 2 (IL-2) and autologous lymphokine-activated killer cells to treat cancer. Serial skin biopsy specimens were obtained before therapy (baseline), during IL-2 administration, and during IL-2/lymphokine-activated killer cell infusion. All patients developed an eruption that was characterized by macular erythema, with burning and pruritus of the skin. It began after two or three days of IL-2 infusion and was usually localized to the head and neck; it occasionally became generalized (ie, erythroderma). The eruption resolved with desquamation within 48 to 72 hours after cessation of infusion of IL-2. Histologically, the changes were not specific. The only consistent immunohistological finding noted was the presence of DR+/Leu-4+ lymphoid cells surrounding blood vessels in the papillary dermis, with fewer of these cells in the epidermis. There was no difference between the clinical or histological features of the eruption that occurred with IL-2 alone and that which occurred with IL-2 and lymphokine-activated killer cell infusion, suggesting that the cutaneous effects were mediated by IL-2 alone. 相似文献
44.
Comparison between traditional 2-dimensional cephalometry and a 3-dimensional approach on human dry skulls. 总被引:4,自引:0,他引:4
Gregory L Adams Stuart A Gansky Arthur J Miller William E Harrell David C Hatcher 《American journal of orthodontics and dentofacial orthopedics》2004,126(4):397-409
The cephalogram is the standard used by orthodontists to assess skeletal, dental, and soft tissue relationships. This approach, however, is based on 2-dimensional (2D) views used to analyze 3-dimensional (3D) objects. The purpose of this project was to evaluate and compare a 3D imaging system and traditional 2D cephalometry for accuracy in recording the anatomical truth as defined by physical measurements with a calibrated caliper. Thirteen skeletal landmarks were located by both radiographic methods on 9 dry human skulls. Intraclass correlation (0.995), variance (0.054 mm(2)), and standard deviation (SD) (0.237 mm) were averaged over 76 measurements and derived from precision calipers to establish these physical measurements as a reliable gold standard to make comparisons of the 2D and 3D radiographic methods. The results showed great variability of the 2D from the gold standard, with the range varying from -17.68 mm (underestimation of Gn-Zyg R) to +15.52 mm (overestimation of Zyg L-Zyg R). In contrast, the 3D method (Sculptor, Glendora, Calif) indicated a range of the SD from -3.99 (underestimation) mm to +2.96 mm (overestimation). The 3D evaluation was much more precise, within approximately 1 mm of the gold standard. These results indicate that, when the actual distance is measured on a human skull in its true dimensions of 3D space, the Sculptor program, by using a 3D method, is more precise and 4 to 5 times more accurate than the 2D approach. Evaluating distances in 3D space with a 2D image grossly exaggerates the true measure and offers a distorted view of craniofacial growth. There is an inherent problem of representing a linear measure occupying a 3D space with a 2D image. 相似文献
45.
46.
Herman Buschke Martin J Sliwinski Gail Kuslansky Mindy Katz Joe Verghese Richard B Lipton 《Journal of the International Neuropsychological Society》2006,12(3):436-440
Impaired recall for early items (primacy) and late items (recency) on word list recall tests are seen in Alzheimer's disease (AD). We compared conventional scoring on the Telephone Instrument for Cognitive Status (TICS) recall list with scorings based on retention-weighted recall (RWR: each item weighted by its serial position) in older adults participating in a community-based aging study. Subjects with mild AD (N=18) did not differ from those without dementia (N=231) with respect to recency (46% vs. 59%, p = 0.2), but had impaired primacy (2% vs. 39%, p < .001) on word recall on the TICS. RWR scoring improved the effect size (1.52 SD) compared to conventional scoring (1.08 SD). With a fixed sensitivity of 85%, specificity was lower using conventional scoring (56%) than RWR (76%) scoring. Our findings suggest that optimized RWR scoring of word list free recall can improve detection of mild AD compared to conventional scoring. 相似文献
47.
48.
49.
50.