全文获取类型
收费全文 | 63367篇 |
免费 | 4638篇 |
国内免费 | 332篇 |
专业分类
耳鼻咽喉 | 635篇 |
儿科学 | 1617篇 |
妇产科学 | 1542篇 |
基础医学 | 7849篇 |
口腔科学 | 1538篇 |
临床医学 | 6359篇 |
内科学 | 14390篇 |
皮肤病学 | 809篇 |
神经病学 | 4998篇 |
特种医学 | 1916篇 |
外国民族医学 | 2篇 |
外科学 | 9794篇 |
综合类 | 1010篇 |
现状与发展 | 1篇 |
一般理论 | 103篇 |
预防医学 | 5272篇 |
眼科学 | 1858篇 |
药学 | 4429篇 |
中国医学 | 139篇 |
肿瘤学 | 4076篇 |
出版年
2023年 | 293篇 |
2022年 | 464篇 |
2021年 | 1156篇 |
2020年 | 726篇 |
2019年 | 1012篇 |
2018年 | 1244篇 |
2017年 | 848篇 |
2016年 | 969篇 |
2015年 | 1138篇 |
2014年 | 1779篇 |
2013年 | 2810篇 |
2012年 | 3780篇 |
2011年 | 4121篇 |
2010年 | 2346篇 |
2009年 | 2196篇 |
2008年 | 4008篇 |
2007年 | 4194篇 |
2006年 | 4024篇 |
2005年 | 4115篇 |
2004年 | 3845篇 |
2003年 | 3457篇 |
2002年 | 3422篇 |
2001年 | 743篇 |
2000年 | 642篇 |
1999年 | 736篇 |
1998年 | 741篇 |
1997年 | 609篇 |
1996年 | 492篇 |
1995年 | 491篇 |
1994年 | 467篇 |
1993年 | 440篇 |
1992年 | 533篇 |
1991年 | 509篇 |
1990年 | 417篇 |
1989年 | 439篇 |
1988年 | 396篇 |
1987年 | 376篇 |
1986年 | 355篇 |
1985年 | 420篇 |
1984年 | 432篇 |
1983年 | 394篇 |
1982年 | 529篇 |
1981年 | 443篇 |
1980年 | 485篇 |
1979年 | 301篇 |
1978年 | 321篇 |
1977年 | 321篇 |
1976年 | 261篇 |
1975年 | 287篇 |
1974年 | 246篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Jenie George B.A. Alon Barsheshet M.D. Arthur J. Moss M.D. David Martin M.D. Gregory Ouellet B.S. Scott McNitt M.S. Ilan Goldenberg M.D. 《Annals of noninvasive electrocardiology》2012,17(1):14-21
Background: Diabetes mellitus (DM) increases the risk for the development of both ischemic and nonischemic cardiomyopathy. We aimed to identify differences in response to cardiac resynchronization therapy with a defibrillator (CRT‐D) among DM patients with ischemic or nonischemic cardiomyopathy. Methods: Cox proportional hazards regression modeling was used to assess clinical response to CRT‐D (defined as CRT‐D vs. defibrillator‐only reduction in the risk of heart failure [HF] or death) and echocardiographic response (defined as percent reduction in left ventricular end diastolic and systolic volume [LVEDV and LVESV, respectively] at 12 month of follow‐up compared with baseline values) among 552 diabetic patients with ischemic (n = 367) or nonischemic (n = 185) cardiomyopathy enrolled in MADIT‐CRT. Results: The clinical benefit of CRT‐D was more pronounced among nonischemic patients (HR = 0.30 [P < 0.001] than among ischemic patients (HR = 0.59 [P = 0.004]; P for interaction = 0.10). Nonischemic patients also experienced significantly greater reductions in LVESV and LVEDV at 12 months with CRT‐D compared with ischemic patients (P < 0.001 for both). Subgroup analysis showed that the most pronounced reduction in HF or death with CRT‐D therapy occurred in nonischemic patients who were women (83% risk‐reduction [P < 0.001]), had a lower BMI (<30/kg/m2: 79% risk‐reduction [P < 0.001]), or had left bundle branch block at enrollment (82% risk‐reduction [P < 0.001]). Conclusions: The present study shows that treatment with CRT‐D in at‐risk cardiac patients with DM is associated with substantial reductions in the risk of HF or death and improvement in cardiac remodeling in those with ischemic and nonischemic cardiomyopathy, with a more pronounced benefit in patients with nonischemic disease. Ann Noninvasive Electrocardiol 2012;17(1):14–21 相似文献
994.
Histological immune response patterns in sentinel lymph nodes involved by metastatic melanoma and prognostic significance
下载免费PDF全文
![点击此处可从《Journal of cutaneous pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
995.
996.
Catherine M. Champagne Hongmei Han Sudip Bajpeyi Jennifer Rood William D. Johnson Carol J. Lammi-Keefe Jean-Pierre Flatt George A. Bray 《Journal of the Academy of Nutrition and Dietetics》2013,113(11):1532-1538
Because day-to-day food intake varies, we tested the hypothesis that ad libitum food intake and energy expenditure show corrective responses over periods of 1 to 10 days in healthy young women. Food intake and accelerometry measurements were collected daily for 17 days in 15 young women. Total daily energy expenditure (TDEE) using doubly labeled water was also measured. The daily deviations in macronutrient and energy intake and energy expenditure from the average values were compared with the deviations observed over succeeding intervals to estimate the corrective responses. The intraindividual coefficients of variation for energy intake averaged ±25%, ranging from 16% to 34%. TDEE had a coefficient of variation of 8.3%, and accelerometry had a coefficient of variation of 8.4% (range=4.6% to 16.4%). Energy expenditure by accelerometry (2,087±191 kcal/day) was not significantly different from TDEE (2,128±177 kcal/day), but reported daily energy intake was 20.4% lower (1,693±276 kcal/day). There were significant corrective responses in energy from fat and total energy intake. This occurred from Days 3 to 6, with a peak at Day 5 that disappeared when data were randomized within each subject. Human beings show corrective responses to deviations from average energy and macronutrient intakes with a lag time of 3 to 6 days, but not 1 to 2 days. These corrective responses are likely to play a role in bringing about weight stability. 相似文献
997.
998.
999.
1000.