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   3531篇
  免费   205篇
  国内免费   4篇
耳鼻咽喉   22篇
儿科学   98篇
妇产科学   86篇
基础医学   502篇
口腔科学   45篇
临床医学   384篇
内科学   956篇
皮肤病学   65篇
神经病学   229篇
特种医学   163篇
外科学   447篇
综合类   16篇
一般理论   1篇
预防医学   179篇
眼科学   30篇
药学   228篇
中国医学   2篇
肿瘤学   287篇
  2023年   18篇
  2022年   9篇
  2021年   52篇
  2020年   34篇
  2019年   64篇
  2018年   115篇
  2017年   60篇
  2016年   77篇
  2015年   119篇
  2014年   96篇
  2013年   140篇
  2012年   290篇
  2011年   274篇
  2010年   142篇
  2009年   115篇
  2008年   242篇
  2007年   270篇
  2006年   268篇
  2005年   246篇
  2004年   252篇
  2003年   238篇
  2002年   238篇
  2001年   61篇
  2000年   53篇
  1999年   31篇
  1998年   16篇
  1997年   9篇
  1996年   13篇
  1995年   6篇
  1994年   9篇
  1993年   9篇
  1992年   23篇
  1991年   13篇
  1990年   13篇
  1989年   10篇
  1988年   20篇
  1987年   14篇
  1986年   16篇
  1985年   8篇
  1984年   9篇
  1983年   8篇
  1982年   4篇
  1981年   4篇
  1979年   9篇
  1978年   2篇
  1976年   6篇
  1975年   2篇
  1973年   4篇
  1967年   2篇
  1966年   2篇
排序方式: 共有3740条查询结果,搜索用时 100 毫秒
91.
Anti-CD20-containing chemotherapy regimens have become the standard of care for patients with follicular lymphoma needing cytotoxic therapy. Four randomized trials demonstrated a clinical benefit for patients treated with rituximab. However, no long-term follow up (i.e. > 5 years) of these trials is yet available. Between May 2000 and May 2002, 358 newly diagnosed patients with high tumor burden follicular lymphoma were randomized to receive cyclophosphamide, adriamycin, etoposide and prednisolone plus interferon-α2a or a similar chemotherapy-based regimen plus rituximab, and outcome was up-dated. With a median follow up of 8.3 years, addition of rituximab remained significantly associated with prolonged event-free survival (primary end point) (P=0.0004) with a trend towards a benefit for overall survival (P=0.076). The Follicular Lymphoma International Prognostic Index score was strongly associated with outcome for both event-free and overall survival in univariate analysis and its prognostic value remained highly significant after adjusting for other significant covariates in multivariate models (P<0.0001 and P=0.001, respectively). Considering long-term toxicity, the addition of rituximab in the first-line setting was confirmed as safe with regards to development of secondary malignancies. Long-term follow up of patients with follicular lymphoma treated in the FL2000 study confirms the sustained clinical benefit of rituximab without long-term toxicity. This study was registered at ClinicalTrials.gov (Identifier:00136552).  相似文献   
92.
We describe a case in which a transjugular intrahepatic portosystemic shunt (TIPS) was inserted to enable palliative treatment of an adenocarcinoma of the esophagus. The cirrhotic patient presented with esophageal varices in contact with a tumor of the esophagus. By relieving portal pressure, TIPS reduced the risk of hemorrhage during laser resection and prevented recurrence of esophageal varices.  相似文献   
93.
94.
95.
96.
This two-center quasiexperimental pilot study was to determine the effect of conversational hypnosis on patient comfort and parasympathetic tone, which may represent a quantitative measure of hypnotic depth, during regional anesthesia. The patients received conversational hypnosis in one center and oral premedication in the other. The patients’ subjective comfort (0-10 rating scale) and objective parasympathetic tone, as assessed by the Analgesia/Nociception Index (ANI), were measured before and after regional anesthesia. The parasympathetic tone and comfort scores evidenced a significantly greater increase in the hypnosis patients than in controls. These findings suggest that using conversational hypnosis during regional anesthesia may be followed by a subjective increase in patient comfort and an objective increase in parasympathetic tone, monitored by ANI.  相似文献   
97.
98.
The in vitro regulation of tumour necrosis factor (TNF)-alpha receptors during Toxoplasma gondii infection of human MRC5 fibroblasts and human myelomonocytic THP-1 cells was investigated. Cells were infected with the virulent RH of T. gondii. TNFR membrane receptors were analysed by flow cytometry with biotinylated TNF-alpha. Shedding of the soluble form of TNFR1 and TNFR2 in cell culture supernatants was measured by enzyme-linked immunosorbent assay, and expression of mRNA production of TNFR1 and TNFR2 was analysed by quantitative real-time polymerase chain reaction, 1 h after infection. In the MRC5 cell line, T. gondii infection did not induce any up- or down-regulation of membrane TNFRs, soluble TNFRs or mRNA of TNFRs. However, THP-1 cell infection with living parasites induced a significant soluble TNFR1 release by THP-1 cells after 1 h. We detected an approximately 50% up-regulation (P < 0.01) of soluble TNFR1 in infected THP-1 cells compared to controls. No change in soluble TNFR2 levels was observed in the same conditions. Moreover, infection decreased the level of TNF membrane receptors, but had no effect on TNFR1 and TNFR2 mRNA levels. TNFR modulation by T. gondii infection, in vitro, depends on the cell type. Furthermore, our data suggest that living parasites control the shedding of the soluble form of TNFR1. This mechanism may influence the role of TNF-alpha in toxoplasmosis.  相似文献   
99.
An NDM-1 carbapenemase-producing Pseudomonas aeruginosa isolate was recovered from a patient hospitalized in France after a previous hospitalization in Serbia. Genetic studies revealed that the blaNDM-1 gene was surrounded by insertion sequence ISAba125 and a truncated bleomycin resistance gene. This blaNDM-1 region was a part of the variable region of a new complex class 1 integron bearing IS common region 1 (ISCR1). The presence of ISPa7 upstream of this integron suggests insertion in a chromosomally located Tn402-like structure.  相似文献   
100.
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