全文获取类型
收费全文 | 33852篇 |
免费 | 1127篇 |
国内免费 | 294篇 |
专业分类
耳鼻咽喉 | 252篇 |
儿科学 | 540篇 |
妇产科学 | 677篇 |
基础医学 | 4237篇 |
口腔科学 | 541篇 |
临床医学 | 2743篇 |
内科学 | 3713篇 |
皮肤病学 | 774篇 |
神经病学 | 1737篇 |
特种医学 | 2172篇 |
外科学 | 2825篇 |
综合类 | 4834篇 |
一般理论 | 3篇 |
预防医学 | 4562篇 |
眼科学 | 286篇 |
药学 | 3053篇 |
中国医学 | 603篇 |
肿瘤学 | 1721篇 |
出版年
2023年 | 112篇 |
2022年 | 137篇 |
2021年 | 303篇 |
2020年 | 284篇 |
2019年 | 342篇 |
2018年 | 537篇 |
2017年 | 373篇 |
2016年 | 495篇 |
2015年 | 509篇 |
2014年 | 1070篇 |
2013年 | 1317篇 |
2012年 | 1577篇 |
2011年 | 1887篇 |
2010年 | 1152篇 |
2009年 | 848篇 |
2008年 | 1840篇 |
2007年 | 5118篇 |
2006年 | 4830篇 |
2005年 | 2701篇 |
2004年 | 1664篇 |
2003年 | 1783篇 |
2002年 | 1311篇 |
2001年 | 722篇 |
2000年 | 765篇 |
1999年 | 473篇 |
1998年 | 302篇 |
1997年 | 268篇 |
1996年 | 251篇 |
1995年 | 196篇 |
1994年 | 175篇 |
1993年 | 79篇 |
1992年 | 90篇 |
1991年 | 168篇 |
1990年 | 105篇 |
1989年 | 74篇 |
1988年 | 77篇 |
1987年 | 54篇 |
1986年 | 77篇 |
1985年 | 64篇 |
1984年 | 45篇 |
1983年 | 46篇 |
1982年 | 71篇 |
1981年 | 65篇 |
1980年 | 46篇 |
1979年 | 60篇 |
1978年 | 53篇 |
1977年 | 39篇 |
1976年 | 45篇 |
1975年 | 51篇 |
1967年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
1.
2.
Sajid Amit Lumbini Barua Abdulla - Al Kafy 《Diabetes & Metabolic Syndrome: Clinical Research & Reviews》2021,15(4):102129
Background and aimsWorldwide the COVID-19 pandemic has accelerated sufferings of mental health and behaviour attitudes of people. Many countries, including Bangladesh, reported suicide as extreme consequences of the psychological burden influenced by COVID-19. The present study explores human stress and its factor influenced by COVID-19 in Bangladesh, which significantly affect the quality of life.MethodsAn online-based questionnaire survey was conducted among 651 adult Bangladeshi populations by capturing socio-demographic information, possible human stress, and consequences of the pandemic. A set of statistical tools such as Pearson's Correlation Matrix (PCM), T-test, Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) were applied to identify the relationship between different factors and influential factors increasing human stress.ResultsMore than 83% of the participants are facing COVID-19 related mental stress, which results in short temper, sleep disorder, and family chaos. PCA and HCA outcomes indicated a significant relationship between the respondents' opinions and human stress factors, which harmonized with the country's existing scenario. PCM results enlighten the relationship between human stress factors and found financial hardship, cutting back daily spending, and food crisis are interconnected together causes stress. Also, hampering students' formal education and future career plans significantly contribute to mental stress.ConclusionBased on the above findings, it's crucial to introduce a time-oriented strategy and implement precaution monitoring plans for Bangladesh. The rescue plan will help people to manage the pandemic and improve mental health to fight against psychological challenges related to COVID-19 and future pandemics. 相似文献
3.
ABSTRACTAlthough communication about sexuality is a significant pathway through which peers influence adolescent sexual development, little research has examined the role of peer networks in the use of sexualized media. We applied a social network approach to assess the role of close peers in adolescent pornography use and sexting in a sample of Croatian high school students. Sexual conversation networks’ characteristics did not correlate with pornography use. In contrast, sexting was associated with the proportion of same gender peers, the proportion of older peers and the proportion of sexually experienced peers in the network – pointing to the role of peer influence. Participants’ gender did not moderate these associations. Specific mechanisms underlying the observed associations and the role of peer selection remain important tasks for future research. 相似文献
4.
Very preterm children are at increased risk of reduced processing speed at 5 years of age,predicted by typical complications of prematurity and prenatal smoking 下载免费PDF全文
5.
Erik de Bakker Mirthe A. M. van der Putten Martijn W. Heymans Sander W. Spiekstra Taco Waaijman Liselotte Butzelaar Vera L. Negenborn Vivian K. Beekman Erman O. Akpinar Thomas Rustemeyer Frank B. Niessen Susan Gibbs 《Experimental dermatology》2021,30(1):169-178
Unpredictable hypertrophic scarring (HS) occurs after approximately 35% of all surgical procedures and causes significant physical and psychological complaints. Parallel to the need to understanding the mechanisms underlying HS formation, a prognostic tool is needed. The objective was to determine whether (systemic) immunological differences exist between patients who develop HS and those who develop normotrophic scars (NS) and to assess whether those differences can be used to identify patients prone to developing HS. A prospective cohort study with NS and HS groups in which (a) cytokine release by peripheral blood mononuclear cells (PBMC) and (b) the irritation threshold (IT) after an irritant (sodium lauryl sulphate) patch test was evaluated. Univariate regression analysis of PBMC cytokine secretion showed that low MCP‐1, IL‐8, IL‐18 and IL‐23 levels have a strong correlation with HS (P < .010‐0.004; AUC = 0.790‐0.883). Notably, combinations of two or three cytokines (TNF‐a, MCP‐1 and IL‐23; AUC: 0.942, Nagelkerke R2: 0.727) showed an improved AUC indicating a better correlation with HS than single cytokine analysis. These combination models produce good prognostic results over a broad probability range (sensitivity: 93.8%, specificity 86.7%, accuracy 90,25% between probability 0.3 and 0.7). Furthermore, the HS group had a lower IT than the NS group and an accuracy of 68%. In conclusion, very fundamental immunological differences exist between individuals who develop HS and those who do not, whereas the cytokine assay forms the basis of a predictive prognostic test for HS formation, the less invasive, easily performed irritant skin patch test is more accessible for daily practice. 相似文献
6.
7.
8.
9.
Ebadi Maryam Bhanji Rahima A. Mazurak Vera C. Montano-Loza Aldo J. 《Journal of gastroenterology》2019,54(10):845-859
Journal of Gastroenterology - Sarcopenia (severe muscle depletion) is a prevalent muscle abnormality in patients with cirrhosis that confers poor prognosis both pre- and post-liver transplantation.... 相似文献
10.
陶瑞卿 《四川生殖卫生学院学报》2006,(5):13-16,23
生殖健康是当今国际社会关注的重要问题,也为我国政府重视。本文通过对攀枝花市人口与计划生育技术服务工作分析,总结出该市生殖健康服务模式的主要内容,对正确认识和提高我国西部地区人口生殖健康会水平,稳定我国低生育率水平,实现优生优育,具有十分重要的现实意义。 相似文献