全文获取类型
收费全文 | 33019篇 |
免费 | 1806篇 |
国内免费 | 147篇 |
专业分类
耳鼻咽喉 | 350篇 |
儿科学 | 733篇 |
妇产科学 | 581篇 |
基础医学 | 6262篇 |
口腔科学 | 743篇 |
临床医学 | 2617篇 |
内科学 | 6264篇 |
皮肤病学 | 854篇 |
神经病学 | 3404篇 |
特种医学 | 1424篇 |
外科学 | 4581篇 |
综合类 | 151篇 |
一般理论 | 14篇 |
预防医学 | 1662篇 |
眼科学 | 721篇 |
药学 | 2315篇 |
中国医学 | 21篇 |
肿瘤学 | 2275篇 |
出版年
2022年 | 161篇 |
2021年 | 345篇 |
2020年 | 293篇 |
2019年 | 488篇 |
2018年 | 570篇 |
2017年 | 437篇 |
2016年 | 565篇 |
2015年 | 651篇 |
2014年 | 781篇 |
2013年 | 1170篇 |
2012年 | 1627篇 |
2011年 | 1748篇 |
2010年 | 1176篇 |
2009年 | 1127篇 |
2008年 | 1883篇 |
2007年 | 1920篇 |
2006年 | 1792篇 |
2005年 | 1916篇 |
2004年 | 1794篇 |
2003年 | 1761篇 |
2002年 | 1843篇 |
2001年 | 341篇 |
2000年 | 266篇 |
1999年 | 386篇 |
1998年 | 502篇 |
1997年 | 412篇 |
1996年 | 367篇 |
1995年 | 337篇 |
1994年 | 289篇 |
1993年 | 258篇 |
1992年 | 210篇 |
1991年 | 204篇 |
1990年 | 170篇 |
1989年 | 162篇 |
1988年 | 169篇 |
1985年 | 157篇 |
1984年 | 181篇 |
1983年 | 161篇 |
1982年 | 198篇 |
1981年 | 169篇 |
1978年 | 135篇 |
1933年 | 170篇 |
1932年 | 180篇 |
1931年 | 167篇 |
1930年 | 169篇 |
1929年 | 147篇 |
1928年 | 163篇 |
1927年 | 144篇 |
1926年 | 158篇 |
1925年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Well‐being,health and fitness of children who use wheelchairs: Feasibility study protocol to develop child‐centred ‘keep‐fit’ exercise interventions
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
3.
4.
Vinke Jeroen Kaper Hans J. Vissink Arjan Sharma Prashant K. 《Clinical oral investigations》2020,24(11):4019-4030
Clinical Oral Investigations - The aims of this study are to assess different saliva substitutes for their efficacy to lubricate the oral cavity, and to relate this oral lubrication to the ability... 相似文献
5.
Anna Maria Colangelo Giovanni Cirillo Lilia Alberghina Michele Papa Hans V.Westerhoff 《中国神经再生研究》2019,(2)
The recognition that neurogenesis does not stop with adolescence has spun off research towards the reduction of brain disorders by enhancing brain regeneration. Adult neurogenesis is one of the tougher problems of developmental biology as it requires the generation of complex intracellular and pericellular anatomies, amidst the danger of neuroinflammation. We here review how a multitude of regulatory pathways optimized for early neurogenesis has to be revamped into a new choreography of time dependencies. Distinct pathways need to be regulated, ranging from neural growth factor induced differentiation to mitochondrial bioenergetics, reactive oxygen metabolism, and apoptosis. Requiring much Gibbs energy consumption, brain depends on aerobic energy metabolism, hence on mitochondrial activity. Mitochondrial fission and fusion, movement and perhaps even mitoptosis, thereby come into play. All these network processes are interlinked and involve a plethora of molecules. We recommend a deep thinking approach to adult neurobiology. 相似文献
6.
Heidi J Kalkwarf John A Shepherd Didier Hans Elena Gonzalez Rodriguez Joseph M Kindler Joan M Lappe Sharon Oberfield Karen K Winer Babette S Zemel 《Journal of bone and mineral research》2022,37(4):776-785
Trabecular bone score (TBS) is used for fracture prediction in adults, but its utility in children is limited by absence of appropriate reference values. We aimed to develop reference ranges for TBS by age, sex, and population ancestry for youth ages 5 to 20 years. We also investigated the association between height, body mass index (BMI), and TBS, agreement between TBS and lumbar spine areal bone mineral density (aBMD) and bone mineral apparent density (BMAD) Z-scores, tracking of TBS Z-scores over time, and precision of TBS measurements. We performed secondary analysis of spine dual-energy X-ray absorptiometry (DXA) scans from the Bone Mineral Density in Childhood Study (BMDCS), a mixed longitudinal cohort of healthy children (n = 2014) evaluated at five US centers. TBS was derived using a dedicated TBS algorithm accounting for tissue thickness rather than BMI. TBS increased only during ages corresponding to pubertal development with an earlier increase in females than males. There were no differences in TBS between African Americans and non-African Americans. We provide sex-specific TBS reference ranges and LMS values for calculation of TBS Z-scores by age and means and SD for calculation of Z-scores by pubertal stage. TBS Z-scores were positively associated with height Z-scores at some ages. TBS Z-scores explained only 27% and 17% of the variance of spine aBMD and BMAD Z-scores. Tracking of TBS Z-scores over 6 years was lower (r = 0.47) than for aBMD or BMAD Z-scores (r = 0.74 to 0.79), and precision error of TBS (2.87%) was greater than for aBMD (0.85%) and BMAD (1.22%). In sum, TBS Z-scores provide information distinct from spine aBMD and BMAD Z-scores. Our robust reference ranges for TBS in a well-characterized pediatric cohort and precision error estimates provide essential tools for clinical assessment using TBS and determination of its value in predicting bone fragility in childhood and adolescence. © 2022 American Society for Bone and Mineral Research (ASBMR). 相似文献
7.
8.
Christer Lunde Gjerstad Hans Jakob Bøe Erik Falkum Egil Wilhelm Martinsen Andreas Espetvedt Nordstrand Arnfinn Tønnesen Jon Gerhard Reichelt June Ullevoldsæter Lystad 《Journal of traumatic stress》2020,33(5):762-772
Peacekeeping missions involve experiences that may impact the mental health of participating soldiers. However, research on the long-term mental health consequences of peacekeeping is sparse. The present study aimed to find the prevalence of mental health problems (MHPs), possible MHP predictors, and associations between predictors and MHPs in Norwegian peacekeepers 18–38 years after deployment to a United Nations peacekeeping mission. We used data from a cross-sectional, postdeployment survey of Norwegian peacekeepers who served in Lebanon between 1978 and 1998 (N = 10,605). Participants were assessed for posttraumatic stress disorder (PTSD); anxiety; depression; insomnia; alcohol misuse; drug misuse; and exposure to pre-, peri-, and postdeployment stressors. Logistic regressions were executed to explore key variables associated with MHPs. Total MHP prevalence was 15.1%, 95% CI [14.4, 15.8]. The estimates for specific disorders were 0.1% for drug misuse, 3.4% for alcohol misuse, 4.0% for depression, 6.2% for PTSD, 6.4% for anxiety, and 9.3% for insomnia. Postdeployment stressors, OR = 1.91, 95% CI [1.79, 2.04]; employment status, OR = 1.41, 95% CI [1.33, 1.48]; and traumatic exposure during deployment, OR = 1.11, 95% CI [1.09, 1.12], were positively related to PTSD, χ2(17, N = 8,568) = 1,791.299, p < .001. Similar patterns were found for the other MHPs. Considering that most participants (84.9%) reported low symptom levels, our findings challenge the widespread public perception that most peacekeepers have MHPs. Moreover, our results indicate that future peacekeepers should be prepared for challenges they may face not only during deployment but also in the years following their homecoming. 相似文献
9.
In developing countries, like Indonesia, apheresis is still a relative new procedure. Nowadays, therapeutic apheresis procedures are performed in the field of hematology and neurology, especially in the teaching hospitals in Indonesia. Therapeutic apheresis procedure, that is, leukocytapheresis, therapeutic plasma exchange (TPE), and thrombocytapheresis are already performed. In the period 2009–2013, 204 apheresis procedures in 137 patients to reduce the leukocytes, 72 TPE procedures in 17 patients, and 14 thrombocyte reductions were performed in the Sardjito hospital, Yogyakarta, Indonesia. In the future, to improve the therapeutic apheresis implementation, it is important to increase the insurance coverage and also should be considered to introduce the apheresis medicine into the curriculum of appropriate physician programs in Indonesia. Especially in Indonesia, a lot of efforts are still being needed to improve implementation of therapeutic apheresis. J. Clin. Apheresis 30:139–140, 2015. © 2014 Wiley Periodicals, Inc. 相似文献