全文获取类型
收费全文 | 33139篇 |
免费 | 2470篇 |
国内免费 | 96篇 |
专业分类
耳鼻咽喉 | 376篇 |
儿科学 | 820篇 |
妇产科学 | 423篇 |
基础医学 | 4536篇 |
口腔科学 | 637篇 |
临床医学 | 2977篇 |
内科学 | 6871篇 |
皮肤病学 | 539篇 |
神经病学 | 3710篇 |
特种医学 | 1362篇 |
外国民族医学 | 3篇 |
外科学 | 4874篇 |
综合类 | 667篇 |
一般理论 | 67篇 |
预防医学 | 2823篇 |
眼科学 | 661篇 |
药学 | 2042篇 |
中国医学 | 20篇 |
肿瘤学 | 2297篇 |
出版年
2023年 | 107篇 |
2022年 | 183篇 |
2021年 | 467篇 |
2020年 | 271篇 |
2019年 | 458篇 |
2018年 | 591篇 |
2017年 | 438篇 |
2016年 | 502篇 |
2015年 | 579篇 |
2014年 | 878篇 |
2013年 | 1359篇 |
2012年 | 2089篇 |
2011年 | 2236篇 |
2010年 | 1188篇 |
2009年 | 1132篇 |
2008年 | 2109篇 |
2007年 | 2236篇 |
2006年 | 2205篇 |
2005年 | 2423篇 |
2004年 | 2124篇 |
2003年 | 1964篇 |
2002年 | 1973篇 |
2001年 | 378篇 |
2000年 | 346篇 |
1999年 | 389篇 |
1998年 | 442篇 |
1997年 | 414篇 |
1996年 | 384篇 |
1995年 | 371篇 |
1994年 | 298篇 |
1993年 | 290篇 |
1992年 | 290篇 |
1991年 | 302篇 |
1990年 | 289篇 |
1989年 | 252篇 |
1988年 | 232篇 |
1987年 | 261篇 |
1986年 | 220篇 |
1985年 | 218篇 |
1984年 | 252篇 |
1983年 | 241篇 |
1982年 | 292篇 |
1981年 | 283篇 |
1980年 | 240篇 |
1979年 | 152篇 |
1978年 | 155篇 |
1977年 | 111篇 |
1976年 | 122篇 |
1975年 | 93篇 |
1974年 | 125篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
Saifudin Rashiq Diane Edlund Bruce D Dick 《BMC medical informatics and decision making》2006,6(1):8-6
Background
There are no published utilities for the post-anesthesia state obtained by the standard gamble method (SG). 相似文献7.
Timothy C. Evans MD PhD ; Keren H. Wick PhD ; Douglas M. Brock PhD ; Douglas C. Schaad PhD ; Ruth Ballweg MPA PA-C 《The Journal of rural health》2006,22(3):212-219
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers. 相似文献
8.
9.
Celia F Hybels Dan G Blazer Carl F Pieper Bruce M Burchett Judith C Hays Gerda G Fillenbaum Laura D Kubzansky Lisa F Berkman 《The American journal of geriatric psychiatry》2006,14(6):498-506
OBJECTIVE: Neighborhood sociodemographic characteristics may be important to the mental health of older adults who have decreased mobility and fewer resources. Our objective was to examine the association between neighborhood context and level of depressive symptomatology in older adults in a diverse geographic region of central North Carolina. METHODS: The sample included 2,998 adults 65 or older residing in 91 census tracts. Depressive symptoms were measured using the Center for Epidemiologic Studies-Depression scale (CES-D). Neighborhoods were characterized by five census-based characteristics: socioeconomic disadvantage, socioeconomic advantage, racial/ethnic heterogeneity, residential stability, and age structure. RESULTS: In ecologic level analyses, level of census tract socioeconomic disadvantage was associated with increased depressive symptoms. To determine whether neighborhood context was associated with depressive symptoms independently of individual characteristics, the authors used multilevel modeling. The authors examined the ability of each of five neighborhood (level 2) characteristics to predict a level 1 outcome (CES-D symptoms) controlling for the effects of individual (level 1) characteristics. Younger age, being widowed, lower income, and having some functional limitations were associated with increased depression symptoms conditional on census tract random effects. However, none of the neighborhood characteristics was significantly associated with depression symptoms, conditional on census tract random effects, either unadjusted or adjusted for individual characteristics. CONCLUSION: Any observed association between neighborhood sociodemographic characteristics and individual depressive symptoms in our sample may reflect the characteristics of the individuals who reside in the neighborhood rather than the neighborhood characteristics themselves. The use of multilevel modeling is important to separate these effects. 相似文献
10.
The effect of bracing on proprioception of knees with anterior cruciate ligament injury. 总被引:2,自引:0,他引:2
Bruce D Beynnon Lars Good May Arna Risberg 《The Journal of orthopaedic and sports physical therapy》2002,32(1):11-15
This paper is a comprehensive review on the effect of bandaging, bracing, and neoprene sleeves on knee proprioception following anterior cruciate ligament (ACL) injury and reconstruction with a focus on studies that have measured joint position sense and threshold to detection of passive knee motion. Disruption of the ACL does not appear to alter joint position sense soon after injury, although there is evidence that in some subjects deterioration may occur over time. An ACL tear creates a deficit in the threshold to detection of passive knee motion soon after injury and in those with chronic tears. The magnitude of worsening is less then 1.0 degree of movement in flexion-extension and of questionable concern from a clinical and functional perspective. Application of a functional brace or neoprene sleeve to the ACL-deficient limb does not improve the threshold to detection of passive knee motion; however, application of an elastic bandage to a knee with an ACL tear improves joint position sense. Reconstruction of a torn ACL is associated with a deficit in the threshold to detection of passive knee motion, and during the first year of healing the use of a neoprene sleeve provides improvement. Two years following ACL reconstruction there is no deficit in the threshold to detection of passive knee motion and the use of a brace has no effect on this outcome. 相似文献