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   54302篇
  免费   4815篇
  国内免费   1123篇
耳鼻咽喉   508篇
儿科学   2697篇
妇产科学   495篇
基础医学   5802篇
口腔科学   773篇
临床医学   5176篇
内科学   5802篇
皮肤病学   267篇
神经病学   16666篇
特种医学   1118篇
外国民族医学   3篇
外科学   3399篇
综合类   5336篇
现状与发展   5篇
一般理论   1篇
预防医学   4025篇
眼科学   200篇
药学   4827篇
  12篇
中国医学   2347篇
肿瘤学   781篇
  2024年   144篇
  2023年   1194篇
  2022年   1662篇
  2021年   2744篇
  2020年   2483篇
  2019年   2371篇
  2018年   2210篇
  2017年   2276篇
  2016年   2300篇
  2015年   2090篇
  2014年   3566篇
  2013年   4811篇
  2012年   2913篇
  2011年   3496篇
  2010年   2632篇
  2009年   2607篇
  2008年   2639篇
  2007年   2458篇
  2006年   2181篇
  2005年   1816篇
  2004年   1511篇
  2003年   1351篇
  2002年   1131篇
  2001年   885篇
  2000年   782篇
  1999年   665篇
  1998年   661篇
  1997年   570篇
  1996年   470篇
  1995年   411篇
  1994年   373篇
  1993年   337篇
  1992年   311篇
  1991年   265篇
  1990年   259篇
  1989年   248篇
  1988年   214篇
  1987年   159篇
  1986年   110篇
  1985年   163篇
  1984年   126篇
  1983年   104篇
  1982年   128篇
  1981年   88篇
  1980年   76篇
  1979年   55篇
  1978年   45篇
  1977年   38篇
  1976年   29篇
  1974年   18篇
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
991.
In this short communication we are providing insight about the regulatory role of the phosphatidylinositol 3-kinase (PI3K)-AKT-mammalian target of rapamycin (mTOR) kinase system in psoriatic disease. This is an upcoming active research field in respect to elucidating the inflammatory and proliferative cascades of psoriatic disease. To provide a new dimension to the understandings of the molecular principles of the pathogenesis of autoimmune diseases, we hypothesized that (i) dysregulation of cytokines and growth factors in autoimmune diseases activate the mTOR signaling system and (ii) the activated mTOR kinase system is a key regulator of the inflammatory/proliferative cascades of the disease process. In support of this hypothesis we have earlier reported that growth factors (nerve growth factor (NGF) and platelet-derived growth factor (PDGF)) and relevant cytokines (interleukin (IL)-17, IL-22) known to be critical for psoriasis, psoriatic arthritis, and rheumatoid arthritis activate the mTOR signaling system. Here, we are providing our latest observations that the mTOR signaling proteins are upregulated in psoriatic skin and further we observed that proliferation of keratinocytes (KC) and synovial cells (synovial fibroblasts (FLS)) of psoriatic arthritis are dependent on the PI3K-AKT-mTOR kinase system. To our knowledge, we are the first to explore whether a double kinase inhibitor of mTOR signal proteins has a therapeutic potential for psoriatic disease. Here we will be sharing our views, our research work in this field and as well we will provide evidences how a double kinase inhibitor of mTOR signal proteins can be an effective therapeutic agent for psoriatic disease.  相似文献   
992.
993.
We report on two patients with recurrent episodes of chronic intestinal pseudo‐obstruction (CIPO). A 50‐year‐old woman with severe multiple sclerosis and an 84‐year‐old man with Parkinson's disease and dementia had multiple hospital admissions because of pain and distended abdomen. Radiographic and endoscopic findings showed massive dilation of the colon without any evidence of obstruction. Conservative management resolved symptoms only for a short period of time. As these patients were poor candidates for any surgical treatment we carried out percutaneous endoscopic colostomy by placing a 20‐Fr tube in the cecum with the introducer method. The procedure led to durable symptom relief without complications. We present these two cases and give a review through the existing literature of the procedure in CIPO.  相似文献   
994.
Alterations in brain glucose metabolism and in peripheral glucose metabolism have frequently been observed in major depressive disorder (MDD). The insulin independent glucose transporter 1 (GLUT1) plays a key role in brain metabolism while the insulin-dependent GLUT4 is the major glucose transporter for skeletal and cardiac muscle. We therefore examined methylation of GLUT1 and GLUT4 in fifty-two depressed inpatients and compared data to eighteen healthy comparison subjects. DNA methylation of the core promoter regions of GLUT1 and GLUT4 was assessed by bisulfite sequencing. Further factors determined were fasting glucose, cortisol, insulin, interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α). We found significantly increased methylation of the GLUT1 in depressed inpatients compared to healthy comparison subjects (CG). Further findings comprise increased concentrations of fasting cortisol, glucose, insulin, and increased IL-6 and TNF-α. After six weeks of inpatient treatment, significantly lower GLUT1 methylation was observed in remitted patients compared to non-remitters. GLUT4 methylation was not different between depressed patients and CG, and did not differ between remitted and non-remitted patients. Although preliminary we conclude from our results that the acute phase of major depressive disorder is associated with increased GLUT1 methylation and mild insulin resistance. The successful treatment of depression is associated with normalization of GLUT1 methylation in remitters, indicating that this condition may be reversible. Failure of normalization of GLUT1 methylation in non-remitters may point to a possible role of impeded brain glucose metabolism in the maintenance of MDD.  相似文献   
995.
996.
997.
Summary. A personal history of excessive mucocutaneous bleeding is a key component in the diagnosis of a number of mild bleeding disorders, including von Willebrand disease (VWD), platelet function disorders (PFD), and coagulation factor deficiencies. However, the evaluation of hemorrhagic symptoms is a well‐recognized challenge for both patients and physicians, because the reporting and interpretation of bleeding symptoms is subjective. As a result, bleeding assessment tools (BATs) have been developed and studied in a variety of clinical settings. This work has been pioneered by a group of Italian researchers, and the resultant ‘Vicenza Bleeding Questionnaire’ stands as the original BAT. In this review, we will discuss the modifications of the Vicenza Bleeding Questionnaire that have taken place over the years, as well as the validation studies that have been published. Other BATs that have been developed and published will be reviewed, as will the special situations of assessing pediatric bleeding as well as menorrhagia. Lastly, the clinical utility of BATs will be discussed including remaining challenges and future directions for the field.  相似文献   
998.
A comprehensive understanding of eating disorders should include engagement with the role of contemporary cultural trends. Feminists and critical social theorists have made significant contributions in this regard. Using two clinical cases, this paper contemplates the relationship between culture and psyche in eating disorder, proposing a psychoanalytic conceptualization underpinned by John Steiner's (1982, 1987, 1993, 2011) theory of pathological organizations and psychic retreats. Two conceptual terms will be introduced, namely ‘the normalized body order’ and ‘the abject body object’ to develop the argument. One of the clinical cases will be used to explore a particular kind of therapeutic impasse that can occur when therapist and patient are both female. In this particular case, the normalized body order emerged temporarily obstructing therapeutic progress; the impasse was understood to be an example of the so‐called anti‐analytic third (Straker, 2006 ).  相似文献   
999.
1000.
This study examined the relationship between coping, rumination and posttraumatic growth in mothers of children with autism spectrum disorders (ASD). One hundred and two mothers of autistic children in China were surveyed using Post-traumatic Growth Inventory, Trait Coping Style Questionnaire, and Event Related Rumination Inventory. Mothers reported mediate level of PTG, mostly on the growth of personal strength. Hierarchal regression analysis indicated that positive coping positively predicted PTG and growth on “relating to others”; deliberate rumination was positively correlated with growth on “appreciation of life”; and intrusive rumination negatively predicted growth on “personal strength”, “new possibilities” and “spiritual change”. No statistically significant relationship between negative coping and PTG was found. The results may be used to provide mothers with a better understanding of the underlying growth process and assist service providers in facilitating this progress.  相似文献   
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