全文获取类型
收费全文 | 7156篇 |
免费 | 501篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 125篇 |
儿科学 | 197篇 |
妇产科学 | 183篇 |
基础医学 | 956篇 |
口腔科学 | 157篇 |
临床医学 | 497篇 |
内科学 | 1827篇 |
皮肤病学 | 226篇 |
神经病学 | 580篇 |
特种医学 | 229篇 |
外科学 | 1110篇 |
综合类 | 38篇 |
一般理论 | 1篇 |
预防医学 | 616篇 |
眼科学 | 108篇 |
药学 | 370篇 |
中国医学 | 33篇 |
肿瘤学 | 429篇 |
出版年
2023年 | 41篇 |
2022年 | 105篇 |
2021年 | 188篇 |
2020年 | 101篇 |
2019年 | 199篇 |
2018年 | 239篇 |
2017年 | 167篇 |
2016年 | 186篇 |
2015年 | 192篇 |
2014年 | 279篇 |
2013年 | 367篇 |
2012年 | 456篇 |
2011年 | 493篇 |
2010年 | 311篇 |
2009年 | 306篇 |
2008年 | 424篇 |
2007年 | 432篇 |
2006年 | 430篇 |
2005年 | 426篇 |
2004年 | 348篇 |
2003年 | 365篇 |
2002年 | 304篇 |
2001年 | 144篇 |
2000年 | 183篇 |
1999年 | 171篇 |
1998年 | 52篇 |
1997年 | 54篇 |
1996年 | 42篇 |
1995年 | 29篇 |
1994年 | 24篇 |
1993年 | 31篇 |
1992年 | 74篇 |
1991年 | 59篇 |
1990年 | 73篇 |
1989年 | 54篇 |
1988年 | 39篇 |
1987年 | 43篇 |
1986年 | 41篇 |
1985年 | 38篇 |
1984年 | 27篇 |
1983年 | 19篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 9篇 |
1979年 | 8篇 |
1978年 | 10篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1975年 | 10篇 |
1971年 | 13篇 |
排序方式: 共有7682条查询结果,搜索用时 15 毫秒
991.
L. Nuñez M. Gil Aguado D. Celemín A. Iglesias J.L. Larrea 《The Annals of thoracic surgery》1982,33(4):354-358
Eight hundred twenty-four patients who had cardiac valve replacement with a porcine bioprosthesis were given either Coumadin (sodium warfarin) or aspirin. No patient in sinus rhythm no matter what valve or valves were replaced had thromboembolism whether treated with Coumadin (124 patients) or aspirin (260 patients). One hundred fifty-one patients who had mitral valve replacement, were in atrial fibrillation, and were treated with Coumadin had seven embolic events (4.6%), while 135 similar patients treated with aspirin had five embolic events (3.7%). Fifty-one patients who had double-valve replacement, were in atrial fibrillation, and were treated with Coumadin had three embolic episodes (5.9%), while 86 similar patients treated with aspirin had three embolic events (3.5%).No statistical difference was found in the incidence of thromboembolism between similar groups of patients whether treated with Coumadin or aspirin (p > 0.05). Hemorrhagic complications were higher and reached statistical significance (p < 0.001) for the group treated with Coumadin. This study shows that aspirin prevents thromboembolic complications as well as Coumadin in patients having cardiac valve replacement with a bioprosthesis, and results in a lower rate of complications. 相似文献
992.
993.
The effect of total enteral tube feeding on the vitamin status of malnourished patients with inflammatory bowel disease 总被引:2,自引:0,他引:2
A Abad-Lacruz F Fernandez-Ba?ares E Cabre A Gil M Esteve F Gonzalez-Huix X Xiol M A Gassull 《International journal for vitamin and nutrition research. Internationale Zeitschrift für Vitamin- und Ern?hrungsforschung. Journal international de vitaminologie et de nutrition》1988,58(4):428-435
Eight malnourished patients (5 men and 3 women, mean age 26.5 +/- 0.4 years) suffering from Inflammatory Bowel Disease were prospectively included at admission to study the effect on protein-energy and vitamin status of a specially designed enterally tube fed formula diet. Eighty nine healthy individuals (36 men and 53 women, mean age 34 +/- 2 years) were used as controls. All but one patient were on steroids. The mean caloric supply was 58.2 +/- 2.4 kcal/kg/day with a mean nitrogen content of 0.37 +/- 0.02 gN/kg/day. The mean Total Enteral Nutrition period lasted 20.8 +/- 2.3 days (range 12 to 28 days). Fat- and water-soluble vitamins were studied at admission and after the nutritional period. Likewise both the protein-energy nutritional status and the activity of the disease were evaluated. At admission, plasma levels of folate, biotin, beta-carotene and vitamins A, C and E were significantly lower in patients than in controls. Tocopherol/cholesterol ratio, and vitamin B1, B2, B6, and B12 status were normal. At the end, plasma values of folate, biotin and vitamin C remained unchanged. However, the protein-energy nutritional status and the activity of the disease significantly improved. At admission, 4 out of 8 patients were at risk of developing hypovitaminosis for vitamins A, C, biotin, beta-carotene, and folate. At the end, a similar percentage remained at risk for these vitamins except for vitamin A. The content of some vitamins in the best designed formula diets does not meet the needs for patients with Inflammatory Bowel Disease. 相似文献
994.
995.
Directional Control of Planar Human Arm Movement 总被引:4,自引:0,他引:4
Gottlieb Gerald L.; Song Qilai; Almeida Gil L.; Hong Di-An; Corcos Daniel 《Journal of neurophysiology》1997,78(6):2985-2998
996.
Orthopaedic examinations were carried out in 242 children studying string instruments. Various indispositions and deformations of the motor organs were found in 31 children. It has been demonstrated that they were mainly the result of technical errors in holding of the instrument, which caused overloading of the upper extremities and the spine. 相似文献
997.
998.
999.
1000.