首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   12952篇
  免费   641篇
  国内免费   32篇
耳鼻咽喉   171篇
儿科学   377篇
妇产科学   352篇
基础医学   1616篇
口腔科学   304篇
临床医学   758篇
内科学   3510篇
皮肤病学   407篇
神经病学   859篇
特种医学   198篇
外科学   1709篇
综合类   133篇
一般理论   2篇
预防医学   1394篇
眼科学   232篇
药学   887篇
中国医学   79篇
肿瘤学   637篇
  2023年   87篇
  2022年   91篇
  2021年   282篇
  2020年   150篇
  2019年   342篇
  2018年   509篇
  2017年   289篇
  2016年   304篇
  2015年   283篇
  2014年   368篇
  2013年   534篇
  2012年   880篇
  2011年   942篇
  2010年   508篇
  2009年   360篇
  2008年   788篇
  2007年   818篇
  2006年   852篇
  2005年   806篇
  2004年   737篇
  2003年   712篇
  2002年   655篇
  2001年   379篇
  2000年   457篇
  1999年   328篇
  1998年   72篇
  1997年   55篇
  1996年   41篇
  1995年   29篇
  1994年   33篇
  1993年   34篇
  1992年   104篇
  1991年   88篇
  1990年   102篇
  1989年   70篇
  1988年   59篇
  1987年   63篇
  1986年   62篇
  1985年   46篇
  1984年   24篇
  1983年   28篇
  1982年   17篇
  1980年   14篇
  1979年   14篇
  1978年   18篇
  1976年   14篇
  1974年   14篇
  1973年   16篇
  1971年   20篇
  1969年   18篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
181.
182.
Pacific Islander women represent a significant at-risk population for cervical cancer, yet little is known about the modifiable factors associated with routine Pap testing. Therefore, the aims of this paper are to report and discuss the known and unknown factors associated with cervical cancer screening among Chamorro women in California. This cross-sectional study explored the factors associated with receipt of regular Pap testing among Chamorro women age 18 years and older in California. A self-administered survey was designed and distributed to women in order to understand their knowledge, beliefs and behaviors regarding routine receipt of Pap tests. Only about two-thirds of women had received a Pap test within the past 2 years, which is below the U.S. average of 72 %. Significant predictors included younger age, health insurance coverage, knowledge of screening frequency, and medically correct beliefs regarding risk groups. These factors, however, accounted for less than 16 % of the variance in Pap testing behavior. We discuss the poor predictive value of existing demographic and theoretical variables, and discuss potentially new areas of research that can aid in the development of future intervention studies. Study limitations and implications are also discussed.  相似文献   
183.
In recent years, efforts to improve cancer therapy have focused on developing new anticancer agents, such as mitocans. These agents include vitamin E analogues and suppress cancer by inducing apoptosis by targeting mitochondria. Alpha tocopheryl succinate (α-TOS) is the most effective form of vitamin E analogues causing inhibition of proliferation and apoptosis of cancer cells. Both in vitro and in vivo studies have demonstrated that α-TOS selectively kills tumor cells with little or no effect on normal cells. Treatment with α-TOS shows great promise for future clinical applications, as it causes cell death, at least in part, by selectively inducing apoptosis by mitochondrial destabilization. This review presents an overview of perspectives on α-TOS and the potential uses of α-TOS in cancer treatment and other clinical applications.  相似文献   
184.
Working memory abilities significantly decrease with advancing age; hence, the search for factors that may increase or mitigate this decline is critical. Several factors have been identified that influence working memory; however, their effects have been mainly assessed separately and rarely together with other factors in the same sample. We examined 120 variables to search for factors that jointly act as mediators of working memory decay across the adult life span. A sample of 1652 healthy adults was assessed in spatial and verbal working memory domains. Structural equation modeling analyses were conducted to search for potential mediators that intervened between age and working memory. Only 14 and 10 variables reliably mediated spatial and verbal working memory, respectively. Factors from several domains remained in the models, such as individual characteristics, physiological traits, consumption habits, and regular activities. These factors are sufficiently powerful to influence working memory decline when they jointly interact, as in everyday living.  相似文献   
185.
Lymphocytopenia and CD4+ T lymphocytopenia can be associated with many bacterial, fungal, parasite and viral infections. They can also be found in autoimmune and neoplastic diseases, common variable immunodeficiency syndrome, physical, psychological and traumatic stress, malnutrition and immunosuppressive therapy. Besides, they can also be brought into relation, without a known cause, with idiopathic CD4+ T lymphocytopenia. Among viral infections, the Retrovirus, specially the human immunodeficiency virus, is the most frequently cause. However, many acute viral infections, including cytomegalovirus and Epstein Barr virus can be associated with transient lymphocytopenia and CD4+ T lymphocytopenia. As is well known, transient lymphocytopenia and CD4+ T lymphocytopenia are temporary and overcome when the disease improves. Nonetheless, severe CD4+ T Lymphocytopenia associated with chronic infections by human herpes virus has not been reported. We describe 6 cases of human immunodeficiency virus negative patients, with chronic cytomegalovirus and Epstein Barr virus infections and profound lymphocytopenia with clinical symptoms of cellular immunodeficiency. These patients improved rapidly with ganciclovir or valganciclovir treatment. We claim here that it is important to consider the chronic human herpes virus infection in the differential diagnosis of profoundly CD4+ T lymphocytopenia etiology, when human immunodeficiency virus is absent, in order to start effective treatment and to determine, in future studies, the impact of chronic human herpes virus infection in human beings'' health.  相似文献   
186.
187.

Objective

To evaluate the incremental cost‐utility ratio (ICUR) of idelalisib in combination with rituximab (IR) versus rituximab monotherapy (R) in the treatment of patients with relapsed or refractory (R/R) chronic lymphocytic leukaemia (CLL), from the Spanish National Health System (NHS) perspective.

Methods

A partitioned survival Markov model for a lifetime horizon (30 years) was developed to estimate costs (€, 2016) and quality‐adjusted life years (QALY) with IR and R. Initial cohort included patients with CLL receiving a second or subsequent line (2L) of treatment with IR or R. Survival data were based on CLL clinical trial. Drug, administration, monitoring, adverse events and clinical management of CLL costs were included in the model. Costs and outcomes were discounted using a 3% annually. Deterministic and probabilistic sensitivity analyses (PSA) were performed.

Results

Compared to R, 2L IR treatment resulted in QALY gain of 3.147 (4.965 versus 1.818). Total costs were €118 254 for IR versus €23 874 for R. ICUR was €29 990/QALY gained with IR versus R. In the PSA, IR was cost‐effective in 78% of iterations using a threshold of €45 000/QALY.

Conclusion

IR can be considered a cost‐effective treatment compared to R, in the treatment of R/R CLL patients for the Spanish NHS.  相似文献   
188.
189.
190.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号