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   1309篇
  免费   66篇
  国内免费   15篇
耳鼻咽喉   16篇
儿科学   55篇
妇产科学   78篇
基础医学   85篇
口腔科学   25篇
临床医学   112篇
内科学   313篇
皮肤病学   12篇
神经病学   77篇
特种医学   90篇
外科学   319篇
综合类   23篇
预防医学   60篇
眼科学   21篇
药学   68篇
中国医学   16篇
肿瘤学   20篇
  2024年   1篇
  2023年   9篇
  2022年   17篇
  2021年   57篇
  2020年   23篇
  2019年   28篇
  2018年   45篇
  2017年   30篇
  2016年   41篇
  2015年   43篇
  2014年   69篇
  2013年   89篇
  2012年   104篇
  2011年   88篇
  2010年   64篇
  2009年   42篇
  2008年   68篇
  2007年   87篇
  2006年   89篇
  2005年   77篇
  2004年   61篇
  2003年   37篇
  2002年   52篇
  2001年   13篇
  2000年   11篇
  1999年   18篇
  1998年   8篇
  1997年   10篇
  1996年   5篇
  1995年   2篇
  1994年   1篇
  1993年   3篇
  1992年   3篇
  1991年   6篇
  1990年   7篇
  1989年   11篇
  1988年   5篇
  1987年   9篇
  1986年   7篇
  1985年   4篇
  1984年   5篇
  1983年   11篇
  1982年   8篇
  1981年   4篇
  1980年   2篇
  1979年   6篇
  1978年   5篇
  1977年   3篇
  1975年   1篇
  1970年   1篇
排序方式: 共有1390条查询结果,搜索用时 734 毫秒
991.
992.
993.
Autosomal recessive Adams–Oliver syndrome was diagnosed in three remotely related Bedouin consanguineous families. Genome-wide linkage analysis ruled out association with known Adams–Oliver syndrome genes, identifying a single-homozygosity ∼1.8-Mb novel locus common to affected individuals (LOD score 3.37). Whole-exome sequencing followed by Sanger sequencing identified only a single mutation within this locus, shared by all affected individuals and found in patients from five additional apparently unrelated Bedouin families: a 1-bp deletion mutation in a predicted alternative splice variant of EOGT, leading to a putative truncated protein. RT-PCR demonstrated that the EOGT-predicted alternative splice variant is ubiquitously expressed. EOGT encodes EGF-domain-specific O-linked N-acetylglucosamine transferase, responsible for extracellular O-GlcNAcylation of epidermal growth factor-like domain-containing proteins, and is essential for epithelial cell-matrix interactions. F-actin staining in diseased fibroblasts showed apparently intact cell cytoskeleton and morphology, suggesting the EOGT mutation acts not through perturbation of cytoskeleton but through other mechanisms yet to be elucidated.  相似文献   
994.
995.
Kawasaki disease is an acute vasculitis syndrome of unknown etiology that mainly affects small and medium-sized arteries, particularly the coronary arteries. This disease is rarely seen in infants and young people in Turkey. In this short report, we present a four-year-old patient who has Kawasaki disease associated with coronary artery aneurysm and underwent coronary bypass grafting.  相似文献   
996.
997.
OBJECTIVE: The purpose of this study is to evaluate the potential use of diode lasers (DLs) to reduce bacteremia associated with ultrasonic scaling (US). Furthermore, the clinical efficacy of DLs as an adjunct to US in the treatment of gingivitis was investigated. BACKGROUND DATA: Recently, lasers have found new applications in dental practice. The benefits of the use of DLs as an adjunct to US have not yet been determined. METHODS: Twenty-two gingivitis patients were treated using a split-mouth study design in which each side was randomly treated by US alone or DL followed by US (DL + US). Blood samples were drawn just before and during US in each treatment step to detect induced bacteremia. Clinical parameters including plaque index, sulcus bleeding index, probing depth, and relative attachment level were recorded at baseline and 4 weeks postoperatively. RESULTS: Bacteremia was detected in 15 patients (68%) after US alone, and in 8 patients following DL + US (36%). The reduction of the incidence of odontogenic bacteremia during US after the application of DL was statistically significant (p < 0.05). Clinical signs improved eventually, with no significant differences between the two treatment regimens (p > 0.05). CONCLUSIONS: Application of DL energy can reduce bacteria in gingival crevices which may reduce bacteremia following US. The use of DL did not show additional clinical influence on gingival healing after treatment of gingivitis with US.  相似文献   
998.
Spinal hydatid disease is rarely encountered in nonendemic regions. It is a progressive disease that is associated with risks of serious morbidity. The authors report a case of an isolated primary hydatid cyst of the spine in a 34-year-old woman who presented with back pain, which had lasted for 3 months, as well as lower-extremity pain and fatigue, which had persisted for 2 months. A neurological examination yielded findings indicative of upper motor neuron involvement with complete sensory loss below the level of T-11. Magnetic resonance imaging of the spine showed multiple extradural cystic lesions with an abscess formation at T-11 and involvement of the paraspinal muscles. The patient underwent spinal decompression in which stabilization and total excision of the multiple epidural and psoas abscesses and paraspinal multiloculated cysts were performed. The diagnosis of hydatid disease associated with another infection was confirmed by histopathological evaluation. Albendazole was administered during the postoperative period. Previous reports of secondary infections accompanying this disease in extraspinal locations have been published. However, to the best of the authors' knowledge, there have been no publications about a secondary infection associated with hydatidosis in the spinal cord. One should bear in mind that spinal hydatidosis may be accompanied by other infections in endemic regions. Antihelminthic treatment should be administered for a long period following early decompressive surgery and adequate stabilization.  相似文献   
999.
BACKGROUND: Regulatory FOXP3+ T cells control immune responses of effector T cells. However, whether these cells regulate antidonor responses in the graft of cardiac allograft patients is unknown. Therefore, we analyzed the gene expression profiles of regulatory and effector T-cell markers during immunological quiescence and acute rejection. METHODS: Quantitative real-time polymerase chain reaction was used to analyze mRNA expression levels in time-zero specimens (n=24) and endomyocardial biopsies (EMB; n=72) of cardiac allograft patients who remained free from rejection (nonrejectors; n=12) and patients with at least one histologically proven acute rejection episode (rejectors; International Society for Heart and Lung Transplantation [ISHLT] rejection grade>2; n=12). RESULTS: For all analyzed regulatory and effector T-cell markers, mRNA expression levels were increased in biopsies taken after heart transplantation compared with those in time-zero specimens. Posttransplantation, the FOXP3 mRNA levels were higher in EMB assigned to a higher ISHLT rejection grade than the biopsies with grade 0: the highest mRNA levels were detected in the rejection biopsies (rejection grade>2; P=0.003). In addition, the mRNA levels of CD25, glucocorticoid-induced TNF receptor family-related gene, cytotoxic T lymphocyte-associated antigen 4, interleukin-2, and granzyme B were also significantly higher in rejecting EMB than in nonrejecting EMB (rejection grade相似文献   
1000.
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