全文获取类型
收费全文 | 5441篇 |
免费 | 338篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 76篇 |
儿科学 | 152篇 |
妇产科学 | 160篇 |
基础医学 | 714篇 |
口腔科学 | 237篇 |
临床医学 | 509篇 |
内科学 | 1018篇 |
皮肤病学 | 176篇 |
神经病学 | 215篇 |
特种医学 | 287篇 |
外国民族医学 | 1篇 |
外科学 | 867篇 |
综合类 | 129篇 |
一般理论 | 3篇 |
预防医学 | 373篇 |
眼科学 | 86篇 |
药学 | 501篇 |
中国医学 | 38篇 |
肿瘤学 | 269篇 |
出版年
2024年 | 6篇 |
2023年 | 48篇 |
2022年 | 143篇 |
2021年 | 202篇 |
2020年 | 135篇 |
2019年 | 184篇 |
2018年 | 236篇 |
2017年 | 182篇 |
2016年 | 191篇 |
2015年 | 205篇 |
2014年 | 289篇 |
2013年 | 347篇 |
2012年 | 457篇 |
2011年 | 450篇 |
2010年 | 291篇 |
2009年 | 234篇 |
2008年 | 286篇 |
2007年 | 251篇 |
2006年 | 219篇 |
2005年 | 194篇 |
2004年 | 154篇 |
2003年 | 132篇 |
2002年 | 116篇 |
2001年 | 41篇 |
2000年 | 46篇 |
1999年 | 45篇 |
1998年 | 56篇 |
1997年 | 55篇 |
1996年 | 60篇 |
1995年 | 55篇 |
1994年 | 37篇 |
1993年 | 38篇 |
1992年 | 22篇 |
1991年 | 26篇 |
1990年 | 31篇 |
1989年 | 33篇 |
1988年 | 28篇 |
1987年 | 36篇 |
1986年 | 37篇 |
1985年 | 22篇 |
1984年 | 20篇 |
1983年 | 24篇 |
1982年 | 21篇 |
1981年 | 21篇 |
1980年 | 26篇 |
1979年 | 9篇 |
1978年 | 13篇 |
1976年 | 11篇 |
1975年 | 7篇 |
1971年 | 8篇 |
排序方式: 共有5811条查询结果,搜索用时 0 毫秒
61.
62.
63.
64.
65.
Hormetic effects of noncoplanar PCB exposed to human lung fibroblast cells (HELF) and possible role of oxidative stress 下载免费PDF全文
Muhammad Zaffar Hashmi Kiran Yasmin Khan Jinxing Hu Naveedullah Xiaomei Su Ghulam Abbas Chunna Yu Chaofeng Shen 《Environmental toxicology》2015,30(12):1385-1392
Hormesis, a biphasic dose–response phenomenon, which is characterized by stimulation of an end point at a low‐dose and inhibition at a high‐dose. In the present study we used human lungs fibroblast (HELF) cells as a test model to evaluate the role of oxidative stress (OS) in hormetic effects of non coplanar PCB 101. Results from 3‐(4,5‐dime‐thylthiazol‐2‐yl)‐2,5‐diphenyltetrazo‐lium bromide (MTT) assay indicated that PCB101 at lower concentrations (10?5 to 10?1 μg mL?1) stimulated HELF cell proliferation and inhibited at high concentrations (1, 5, 10, and 20 μg mL?1) in a dose‐ and time‐dependent manner. Reactive oxygen species (ROS), malondialdehyde (MDA) and superoxide dismutase (SOD) (except 48 h) showed a significant increase at higher concentrations of PCB 101 than those at the lower concentrations with the passage of time. Antioxidant enzymes such as glutathione peroxidase (GSH‐Px) exhibited decreasing trends in dose and time dependent manner. Lipid peroxidation assay resulted in a significant increase (P < 0.05) of MDA level in PCB 101‐treated HELF cells compared with controls, suggesting that OS plays a key role in PCB 101‐induced toxicity. Comet assay indicated a significant increase in genotoxicity at higher concentrations of PCB 101 exposure compared to lower concentrations. Overall, we found that HELF cell proliferation was higher at low ROS level and vice versa, which revealed activation of cell signaling‐mediated hormetic mechanisms. The results suggested that PCB 101 has hormetic effects to HELF cells and these were associated with oxidative stress. © 2014 Wiley Periodicals, Inc. Environ Toxicol 30: 1385–1392, 2015. 相似文献
66.
Characterization of cleaning and disinfecting tasks and product use among hospital occupations 下载免费PDF全文
67.
背景目前已开展了对重性精神病患者进提供连续性服务的研究。目的探讨基层对有抑郁症风险患者提供连续性服务的水平,并与对心力衰竭患者的服务水平进行对比。方法采用抑郁症风险患者与心力衰竭患者对比的探索性研究。采用患者问卷评估服务的持续性,包含如下内容:(1)联系的服务提供者数(个人连续性);(2)诊所内服务提供者之间的合作(团队连续性)(6个项目,分数1~5分);(3)诊所外全科医师与服务提供者之间的合作(跨界连续性)(4个项目,分数1~5分)。结果大多数抑郁症风险患者在过去1年中寻遍整个服务提供界联系了几个服务提供者,曾遇到过高水平团队连续性服务及低水平跨界连续性服务。在诊所中可接触到的不同服务提供者要明显多于心力衰竭患者服务提供者(P<0.01)。抑郁症风险患者的服务提供者之间的合作更好一些,每项平均得分4.3分,心力衰竭患者得分为4.0分(P=0.03)。然而,跨界连续性服务方面正好相反:抑郁症风险患者每项平均得分3.5分,心力衰竭患者得分为4.0分(P=0.01)。结论抑郁症风险患者与心力衰竭患者之间的探索性对比显示:体验服务连续性方面的差距不大。对此还应行进一步分析。 相似文献
68.
Agnes I. Berta Abbas Agaimy Joachim M. Braun Bernhard Manger Friedrich E. Kruse Leonard Holbach 《Orbit (Amsterdam, Netherlands)》2015,34(5):299-301
IgG4-related disease is a newly recognized fibro-inflammatory condition. The purpose of this report is to present a patient with 11 years of follow-up, who revealed characteristic features of IgG4-related disease with systemic, orbital and corneal involvement and showed a favorable response to steroids and rituximab treatment. 相似文献
69.
Elham Vaez Rohini Indran Abbas Abdollahi Rumaya Juhari Mariani Mansor 《Vulnerable children and youth studies》2015,10(4):321-336
The development of children over time is one of the continuing aims of psychological inquiry. Many studies have concluded that children who grew up in dysfunctional households show inconsistent development across various developmental pathways. Previous studies have consistently concluded how different family factors, such as interparents relationship, parent–child relationships, and emotional relations in families, can explain the outcomes of child behavior problems. Therefore, this paper attempts to review the empirical findings of previous studies that assess the effects of marital relations on child behavioral development by reviewing the literature that supports the association between marital relations and behavioral problems of children. Twenty-seven studies were chosen for their outcomes. This review used online databases such as Google Scholar, Scopus, ProQuest, Psychological and Behavioral Science collection, SAGE full-text collection in psychology, and PsycINFO. The key words used were marital relation, marital conflict, marital satisfaction, child behavior problem, and offspring behavior adjustment. All articles hypothesized that marital relation affects child adjustment and behavior outcomes directly and indirectly. Approximately all the research samples were in the developmental stage (ages 3 to 12). Various methodologies were used in the studies, but some methodological defects in the literature in some way diminished the interpretation of their findings. Results revealed that children who come from families high in conflict are at risk of psychopathological developmental problems in their adolescent years. This review adds to a large collection of literature that highlights the damaging effects of marital conflict on children. Research limitations and suggestions for future studies are outlined. The study provides a concrete basis for further research on this topic considering that married couples and child behavior problems are varied. This review can benefit married and soon-to-be married couples by revealing perceptions into the experiences of others as regards marriage problem solving. 相似文献
70.
Shirzad GHOLAMI Farhang BABAMAHMOODI Rohallah ABEDIAN Mehdi SHARIF Abbas SHAHBAZI Abdolsattar PAGHEH Mahdi FAKHAR 《Iranian Journal of Parasitology》2015,10(1):110-115