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   2337399篇
  免费   178801篇
  国内免费   5836篇
耳鼻咽喉   32232篇
儿科学   79066篇
妇产科学   64195篇
基础医学   338832篇
口腔科学   63590篇
临床医学   217910篇
内科学   455757篇
皮肤病学   48889篇
神经病学   189915篇
特种医学   88688篇
外国民族医学   912篇
外科学   340279篇
综合类   51645篇
现状与发展   2篇
一般理论   800篇
预防医学   190899篇
眼科学   52036篇
药学   173582篇
  7篇
中国医学   5065篇
肿瘤学   127735篇
  2019年   18538篇
  2018年   26095篇
  2017年   19646篇
  2016年   21490篇
  2015年   24536篇
  2014年   33955篇
  2013年   52443篇
  2012年   71943篇
  2011年   76345篇
  2010年   44964篇
  2009年   42100篇
  2008年   71149篇
  2007年   75726篇
  2006年   76027篇
  2005年   73713篇
  2004年   71071篇
  2003年   68335篇
  2002年   66495篇
  2001年   107929篇
  2000年   111687篇
  1999年   94337篇
  1998年   26627篇
  1997年   24052篇
  1996年   24148篇
  1995年   22975篇
  1994年   21689篇
  1993年   20240篇
  1992年   75569篇
  1991年   74047篇
  1990年   71810篇
  1989年   68420篇
  1988年   63286篇
  1987年   62130篇
  1986年   58568篇
  1985年   56018篇
  1984年   42274篇
  1983年   35778篇
  1982年   21160篇
  1981年   19107篇
  1979年   38101篇
  1978年   26894篇
  1977年   22410篇
  1976年   21485篇
  1975年   22633篇
  1974年   27036篇
  1973年   26301篇
  1972年   24233篇
  1971年   22313篇
  1970年   20932篇
  1969年   18980篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
A 17‐year‐old boy presented with recurring severe dermatitis of the face of 5‐months duration that resembled impetigo. He had been treated with several courses of antibiotics without improvement. Biopsy showed changes consistent with allergic contact dermatitis and patch testing later revealed sensitization to benzoyl peroxide, which the patient had been using for the treatment of acne vulgaris.  相似文献   
132.
133.
In 1963, Goffman argued that forming a group based on shared stigma may provide benefits. However, there is no empirical research on whether perception that a separate, unique, coherent group exists (i.e., group entitativity) influences coping, such as educating others or secrecy, for the stigmatized individual or his or her spouse. Further, little is known about how spouses influence each other in terms of promoting the education of others about a stigmatizing condition, especially when it comes to the role of believing that stigma-based groups, to which they may both belong, exist. This study provides a step toward bridging this gap in the research by applying the label management model in efforts to understand coping for couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). This study included 50 married couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). We found that group entitativity related to those with AATD counterbalanced the influence of genetic stigma on spouses’ intentions to keep the diagnosis secret or to educate others about it. Intrapersonal and interpersonal influences appeared among spouses. Attention is needed on the power of creating groups for stigmatized persons and their relatives. Indeed, people live within a dynamic world of group entities, and multiple social identities including spousal and familial. While attention has been paid to the diffusion of stigmas to loved ones, less has been paid to the uplift of group entities for them.  相似文献   
134.
135.
136.
137.
138.
This study used the National Survey of Ambulatory Surgery (NSAS) database to measure the incidence of and risk factors for symptoms in the ambulatory surgery center and problems within 24 h after isolated carpal tunnel release (CTR). The NSAS contained records on 400,000 adult patients with carpal tunnel syndrome who were treated with CTR in 2006, based on ICD-9 codes. The type of anesthesia used and factors associated with symptoms and problems were sought in bivariate and multivariable statistical analyses. The mean duration of the procedure was 16 ± 8.8 min. Only 5 % were performed under local anesthesia without sedation, 45 % with IV sedation, 28 % regional anesthesia, and 19 % general anesthesia. Symptoms in the ambulatory surgery center or a problem within 24 h after discharge were recorded in 10 % of patients, all of them minor and transient, including difficulties with pain and its treatment. The strongest risk factors were male sex, age of 45 years and older, and participation of an anesthesiologist. Local anesthesia and regional anesthesia were associated with more perioperative symptoms and postoperative problems. Most CTR are performed with some sedation in the United States. CTR is a safe procedure: one in 10 patients will experience a minor issue in the perioperative or immediate postoperative period.  相似文献   
139.
Background Immune checkpoint blockers (ICBs) activate CD8+ T cells, eliciting both anti-cancer activity and immune-related adverse events (irAEs). The relationship of irAEs with baseline parameters and clinical outcome is unclear.Methods Retrospective evaluation of irAEs on survival was performed across primary (N = 144) and secondary (N = 211) independent cohorts of patients with metastatic melanoma receiving single agent (pembrolizumab/nivolumab—sICB) or combination (nivolumab and ipilimumab—cICB) checkpoint blockade. RNA from pre-treatment and post-treatment CD8+ T cells was sequenced and differential gene expression according to irAE development assessed.Results 58.3% of patients developed early irAEs and this was associated with longer progression-free (PFS) and overall survival (OS) across both cohorts (log-rank test, OS: P < 0.0001). Median survival for patients without irAEs was 16.6 months (95% CI: 10.9–33.4) versus not-reached (P = 2.8 × 10−6). Pre-treatment monocyte and neutrophil counts, but not BMI, were additional predictors of clinical outcome. Differential expression of numerous gene pathway members was observed in CD8+ T cells according to irAE development, and patients not developing irAEs demonstrating upregulated CXCR1 pre- and post-treatment.Conclusions Early irAE development post-ICB is associated with favourable survival in MM. Development of irAEs is coupled to expression of numerous gene pathways, suggesting irAE development in-part reflects baseline immune activation.Subject terms: Immunotherapy, Melanoma  相似文献   
140.
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