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   1754篇
  免费   191篇
  国内免费   51篇
耳鼻咽喉   13篇
儿科学   105篇
妇产科学   26篇
基础医学   164篇
口腔科学   113篇
临床医学   200篇
内科学   423篇
皮肤病学   40篇
神经病学   45篇
特种医学   212篇
外国民族医学   1篇
外科学   144篇
综合类   113篇
预防医学   124篇
眼科学   48篇
药学   131篇
中国医学   9篇
肿瘤学   85篇
  2024年   4篇
  2023年   30篇
  2022年   26篇
  2021年   54篇
  2020年   46篇
  2019年   34篇
  2018年   53篇
  2017年   71篇
  2016年   70篇
  2015年   52篇
  2014年   97篇
  2013年   111篇
  2012年   86篇
  2011年   67篇
  2010年   90篇
  2009年   93篇
  2008年   52篇
  2007年   102篇
  2006年   62篇
  2005年   48篇
  2004年   39篇
  2003年   27篇
  2002年   19篇
  2001年   37篇
  2000年   22篇
  1999年   24篇
  1998年   78篇
  1997年   68篇
  1996年   59篇
  1995年   52篇
  1994年   47篇
  1993年   43篇
  1992年   16篇
  1991年   8篇
  1990年   22篇
  1989年   22篇
  1988年   24篇
  1987年   14篇
  1986年   19篇
  1985年   19篇
  1984年   10篇
  1983年   13篇
  1982年   9篇
  1981年   5篇
  1980年   8篇
  1979年   4篇
  1978年   6篇
  1977年   5篇
  1976年   13篇
  1975年   9篇
排序方式: 共有1996条查询结果,搜索用时 15 毫秒
51.
The use of sentinel node surgery for esophageal carcinoma is still under investigation. We evaluated the data available in the literature on this topic, and herein present the results in a systematic review format. PUBMED, SCOPUS, the ISI web of knowledge and the information from the annual meetings of the Japan Esophageal Society were searched using the search terms: “(esophagus OR esophageal) AND sentinel”. The outcomes of interest were the detection rate and sensitivity. Overall, 18 studies were included. The pooled detection rate was 89.2 % [82.6–93.5]. Patients with T1 and two tumors had a 17 % higher detection rate compared to those with T3 and four tumors. The pooled sensitivity was 84 % [78–88 %]. The sensitivity was higher for adenocarcinoma compared to squamous cell carcinoma (SCC) (91 vs. 81 %). In the SCC patients, there was a trend toward decreased sensitivity associated with an increasing tumor depth (T1:88 %, T2:76 %, T3:50 %). Our analysis indicated that sentinel node biopsy is useful in adenocarcinoma patients. For SCC patients, including only cN0 patients (preferably T1 and 2) would increase the detection rate and sensitivity. Due to the limited number of high-quality studies, drawing any more definite conclusions is impossible. Large cohort studies with a standardized and consistent design will be needed in the future.  相似文献   
52.
53.
54.
Journal of Thrombosis and Thrombolysis - Deep vein thrombosis (DVT) is a common complication in hematologic malignancies and immunologic disorders that coagulation and inflammatory factors play a...  相似文献   
55.
56.
The current literature describes pivotal mechanisms in which hepatitis B virus (HBV) induces liver diseases including inflammation, cirrhosis and hepatocellular carcinoma (HCC). It appears that differences in genetic and immunological parameters between patients and controls may be responsible for inducing the prolonged forms of the infection. Previous studies demonstrated that Toll-Like Receptors (TLRs) play key roles in viral recognition and inducing appropriate immune responses. Therefore, TLRs can be considered as key sensors for HBV recognition and subsequent induction of immune responses against this virus. It has also been shown that the TLR2 detects several microbial PAMPs either in its homodimer form or in a heterodimer with TLR1 or TLR6 and subsequently activates NF-κB in a MYD88 dependent manner. Therefore, defective TLR2 expression may result in impaired immune responses against HBV which is reported in long-term forms of hepatitis B. This review presents the recent data regarding the status and important roles played by TLR2 in HBV recognition and induction or suppression of immune responses against HBV as well as its roles in the pathogenesis of cirrhosis and HCC in prolonged hepatitis B forms.  相似文献   
57.
We present the 2021 Singapore Paediatric Resuscitation Guidelines. The International Liaison Committee on Resuscitation’s Pediatric Taskforce Consensus Statements on Science and Treatment Recommendations, which was published in October 2020, and the updated resuscitation guidelines from the American Heart Association and European Resuscitation Council, were reviewed and discussed by the committee. These recommendations were derived after deliberation of peer-reviewed evidence updates on paediatric resuscitation and took into consideration the local setting and clinical practice.  相似文献   
58.
BackgroundThis paper is a follow‐up study continuing the COVISTRESS network previous research regarding health‐related determinants.ObjectiveThe aim was to identify the main consequences of COVID‐19 lockdown on Body Mass Index and Perceived Fragility, related to Physical Activity (PA), for different categories of populations, worldwide.DesignThe study design included an online survey, during the first wave of COVID‐19 lockdown, across different world regions.Setting and participantsThe research was carried out on 10 121 participants from 67 countries. The recruitment of participants was achieved using snowball sampling techniques via social networks, with no exclusion criteria other than social media access.Main outcome measures Body Mass Index, Physical Activity, Perceived Fragility and risk of getting infected items were analysed. SPSS software, v20, was used. Significance was set at P < .05.Results Body Mass Index significantly increased during lockdown. For youth and young adults (18‐35 years), PA decreased by 31.25%, for adults (36‐65 years) by 26.05% and for the elderly (over 65 years) by 30.27%. There was a high level of Perceived Fragility and risk of getting infected for female participants and the elderly. Correlations between BMI, Perceived Fragility and PA were identified.Discussion and ConclusionsThe research results extend and confirm evidence that the elderly are more likely to be at risk, by experiencing weight gain, physical inactivity and enhanced Perceived Fragility. As a consequence, populations need to counteract the constraints imposed by the lockdown by being physically active.  相似文献   
59.
60.
Among the available dressings for partial‐thickness burn wound treatment, SUPRATHEL has shown good usability and effectiveness for wound healing and patient comfort and has been used in many burn centres in the last decade. Recently, bacterial nanocellulose (BNC) has become popular for the treatment of wounds, and many studies have demonstrated its efficacy. epicitehydro, consisting of BNC and 95% water, is a promising product and has recently been introduced in numerous burn centres. To date, no studies including direct comparisons to existing products like SUPRATHEL have been conducted. Therefore, we aimed to compare epicitehydro to SUPRATHEL in the treatment of partial‐thickness burns. Twenty patients with partial‐thickness burns affecting more than 0.5% of their total body surface area (TBSA) were enrolled in this prospective, unicentric, open, comparative, intra‐individual clinical study. After debridement, the wounds were divided into two areas: one was treated with SUPRATHEL and the other with epicitehydro. Wound healing, infection, bleeding, exudation, dressing changes, and pain were documented. The quality of the scar tissue was assessed subjectively using the Patient and Observer Scar Scale. Wound healing in patients with a mean TBSA of 9.2% took 15 to 16 days for both treatments without dressing changes. All wounds showed minimal exudation, and patients reported decreased pain with the only significant difference between the two dressings on day 1. No infection or bleeding occurred in any of the wounds. Regarding scar evaluation, SUPRATHEL and epicitehydro did not differ significantly. Both wound dressings were easy to use, were highly flexible, created a safe healing environment, had similar effects on pain reduction, and showed good cosmetic and functional results without necessary dressing changes. Therefore, epicitehydro can be used as an alternative to SUPRATHEL for the treatment of partial‐thickness burn wounds.  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