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   1339397篇
  免费   115013篇
  国内免费   6367篇
耳鼻咽喉   16822篇
儿科学   43054篇
妇产科学   36671篇
基础医学   184085篇
口腔科学   36307篇
临床医学   120895篇
内科学   279029篇
皮肤病学   31990篇
神经病学   110664篇
特种医学   55701篇
外国民族医学   275篇
外科学   211040篇
综合类   31562篇
现状与发展   2篇
一般理论   415篇
预防医学   106827篇
眼科学   28097篇
药学   93965篇
  5篇
中国医学   2232篇
肿瘤学   71139篇
  2018年   13453篇
  2017年   10687篇
  2016年   12863篇
  2015年   14375篇
  2014年   20049篇
  2013年   29894篇
  2012年   36477篇
  2011年   39111篇
  2010年   24543篇
  2009年   24037篇
  2008年   36607篇
  2007年   39066篇
  2006年   40173篇
  2005年   38749篇
  2004年   36974篇
  2003年   36070篇
  2002年   34064篇
  2001年   66087篇
  2000年   67940篇
  1999年   56612篇
  1998年   16779篇
  1997年   15076篇
  1996年   16063篇
  1995年   16275篇
  1994年   15130篇
  1993年   14186篇
  1992年   47134篇
  1991年   45756篇
  1990年   43992篇
  1989年   41830篇
  1988年   38771篇
  1987年   38097篇
  1986年   35868篇
  1985年   34674篇
  1984年   26392篇
  1983年   22134篇
  1982年   13879篇
  1981年   12475篇
  1980年   11750篇
  1979年   23559篇
  1978年   17090篇
  1977年   14406篇
  1976年   13198篇
  1975年   13732篇
  1974年   16102篇
  1973年   15403篇
  1972年   14181篇
  1971年   13043篇
  1970年   11884篇
  1969年   11106篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
Journal of Thrombosis and Thrombolysis - Amniotic fluid embolism (AFE) is a catastrophic condition in the peripartum period and still remains as a leading cause of maternal death. Although over 80%...  相似文献   
102.
ABSTRACT

Objective

To investigate primary care physician clinical practice patterns, barriers, and education surrounding pediatric physical activity (PA), and to compare practice patterns by discipline.  相似文献   
103.
104.
Psoriasis is a chronic, inflammatory, immune‐mediated disease. Approximately 30% of patients have disease onset before age 18 years. Psoriasis in children and adolescents may be difficult to control, with subsequent poor quality of life and psychosocial consequences. We describe the case of a 12‐year‐old boy with severe, refractory, chronic plaque psoriasis for 6 years. Various therapeutic regimens including different topical corticosteroids, topical vitamin D analogs, phototherapy, photochemotherapy, systemic therapy with methotrexate, cyclosporin, and combination therapies showed only partial or transient responses with frequent relapses. Because anti‐interleukin‐12/23 agents have been successfully used in adults with psoriasis, ustekinumab was initiated and our patient showed a rapid, excellent, sustained response. No recurrence or flares have been observed after 33 months of follow‐up. This case illustrates that ustekinumab may be an effective and safe therapeutic option in adolescents with psoriasis.  相似文献   
105.
Moderate weight loss improves numerous risk factors for cardiometabolic disease; however, long-term weight loss maintenance (WLM) is often thwarted by metabolic adaptations that suppress energy expenditure and facilitate weight regain. Skeletal muscle has a prominent role in energy homeostasis; therefore, we investigated the effect of WLM and weight regain on skeletal muscle in rodents. In skeletal muscle of obesity-prone rats, WLM reduced fat oxidative capacity and downregulated genes involved in fat metabolism. Interestingly, even after weight was regained, genes involved in fat metabolism were also reduced. We then subjected mice with skeletal muscle lipoprotein lipase overexpression (mCK-hLPL), which augments fat metabolism, to WLM and weight regain and found that mCK-hLPL attenuates weight regain by potentiating energy expenditure. Irrespective of genotype, weight regain suppressed dietary fat oxidation and downregulated genes involved in fat metabolism in skeletal muscle. However, mCK-hLPL mice oxidized more fat throughout weight regain and had greater expression of genes involved in fat metabolism and lower expression of genes involved in carbohydrate metabolism during WLM and regain. In summary, these results suggest that skeletal muscle fat oxidation is reduced during WLM and regain, and therapies that improve skeletal muscle fat metabolism may attenuate rapid weight regain.  相似文献   
106.
An association between juvenile xanthogranuloma (JXG), neurofibromatosis type 1 (NF1), and juvenile myelomonocytic leukemia (JMML) has been described in the literature but has only been documented in approximately 20 cases. We diagnosed a patient with NF1 at 25 months of age, before any cutaneous stigmata of this disease had appeared, because we decided to screen for the NF1 gene mutation because of his presentation with multiple JXGs and moderate macrocephaly (2.5 standard deviations) at 9 months of age and JMML diagnosed at 20 months of age. The child is well today after treatment with chemotherapy and allogenic bone marrow transplantation. With increased awareness, patients with JXG and NF1 who develop symptoms possibly related to JMML, such as paleness, skin bleeding, cough, unexplained fever, and hepatosplenomegaly, should be further evaluated. We also emphasize that multiple JXG lesions can be an early marker of NF1.  相似文献   
107.
108.
109.
110.
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