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   1346篇
  免费   88篇
  国内免费   19篇
耳鼻咽喉   7篇
儿科学   94篇
妇产科学   23篇
基础医学   126篇
口腔科学   32篇
临床医学   108篇
内科学   273篇
皮肤病学   30篇
神经病学   32篇
特种医学   142篇
外科学   162篇
综合类   136篇
预防医学   93篇
眼科学   9篇
药学   71篇
中国医学   40篇
肿瘤学   75篇
  2023年   12篇
  2022年   26篇
  2021年   44篇
  2020年   33篇
  2019年   28篇
  2018年   39篇
  2017年   22篇
  2016年   25篇
  2015年   31篇
  2014年   57篇
  2013年   46篇
  2012年   78篇
  2011年   72篇
  2010年   85篇
  2009年   69篇
  2008年   37篇
  2007年   42篇
  2006年   55篇
  2005年   46篇
  2004年   34篇
  2003年   40篇
  2002年   24篇
  2001年   19篇
  2000年   10篇
  1999年   21篇
  1998年   47篇
  1997年   61篇
  1996年   53篇
  1995年   38篇
  1994年   32篇
  1993年   31篇
  1992年   12篇
  1991年   8篇
  1990年   10篇
  1989年   23篇
  1988年   19篇
  1987年   19篇
  1986年   16篇
  1985年   10篇
  1984年   11篇
  1982年   10篇
  1981年   8篇
  1980年   11篇
  1979年   3篇
  1977年   7篇
  1976年   7篇
  1975年   3篇
  1969年   2篇
  1958年   4篇
  1957年   2篇
排序方式: 共有1453条查询结果,搜索用时 15 毫秒
101.
Background  Palmoplantar pustulosis (PPP) discloses some differences compared to vulgar psoriasis (PV) in terms of age of onset, female predominance and low occurrence of psoriasis lesions elsewhere. Cigarette smoking has been associated to PPP in international studies; nevertheless, these studies were never performed among Brazilian.
Objectives  To compare prevalence of smoking among PPP, PV and other dermatologic patients (NPD).
Methods  Case–control study involving 25 PPP patients from a reference psoriasis centre. Two control groups were matched according to gender and age: 50 patients with PV and 50 NPD. Confounders were adjusted by conditional multiple logistic regression.
Results  Among cases, 84.0% were female and PPP age of disease onset (41.4 years) was greater than PV (34.5 years). Prevalence of ever smoking was higher among cases (92.0%) than PV (52.0%) and NPD (30.0%). Adjusted odds ratio of PPP ever smoking compared to PV and NPD was 9.5 and 36.2, respectively. All smokers reported the onset of their habit before the development of PPP.
Conclusions  There was significant association between PPP and smoking. However, the impact of giving it up in the clinical course of the disease remains to be established.  相似文献   
102.
103.
104.
Adrenal tumours are either functioning or non-functioning. Non-functioning adrenal tumours are generally asymptomatic and usually of enormous proportions at the time of presentation. A case is presented here of a patient with a huge right adrenal haemangioma which was successfully treated surgically. This unusual tumour was 25 cm in diameter, was well encapsulated and weighed 4 kg. The literature pertaining to this interesting case is reviewed.  相似文献   
105.
106.
107.
108.
Eighteen patients with a variety of non-gastrointestinal symptomswere incidentally found to have circulating antireticulin antibodyand on subsequent testing were also positive for antigliadinantibody. They prospectively underwent jejunal biopsy to determinewhether or not they had coeliac disease. Their age range was21–79 years (mean 42 years). Enteropathy was present in13 (72 per cent) and was always associated with circulatingIgA antigliadin antibody. Enteropathy was not present in thefive cases who had only IgG antibody. Clinical improvement occurredin eight of 11 patients who complied with a gluten-free dietand was paralleled by an improvement in the mucosal histologyin seven of eight who were re-biopsied. The most remarkablecases were two patients who presented with severe debility andno apparent haematological or biochemical abnormalities, andwho subsequently made a dramatic recovery on a gluten-free diet.It is concluded that antireticulin antibody detected by routineautoantibody screening and confirmed to have IgA antigliadinantibody specificity is a useful indicator of an otherwise undiagnosedenteropathy. This serves to emphasize that the condition cansometimes be associated with atypical features and significantmorbidity.  相似文献   
109.
Epidemiological analyses of injury patterns and mechanisms help to identify the expertise military surgeons need in a combat setting and accordingly help to adjust infrastructure and training requirements. Therefore, a MEDLINE search (1949–2009), World Wide Web search (keywords “combat, casualties, war, military, wounded and neurosurgery”) and an analysis of deaths among allied war casualties in Afghanistan and Iraq were performed. Up to 10th December 2009 there had been 4,688 allied military deaths in Iraq and 1,538 in Afghanistan. Of these 22% died in non-hostile action, 33% in direct combat situations and the majority of 45% in indirect combat actions. The leading causes of injury were explosive devices (70%) and gunshot wounds. Chest or abdominal injuries (40%) and traumatic brain injuries (35%) were the main causes of death for soldiers killed in action. The case fatality rate in Iraq is approximately half that of the Vietnam War, whereas the killed-in-action rate in Afghanistan (18.7%) is similar to the Vietnam War (20%); however, the amputation rate is twice as high in modern conflicts. Approximately 8–15% of the fatal injuries seem to be potentially survivable. Military surgeons must have an excellent expertise in a wide variety of surgical specialties. Life saving emergency care, especially in the fields of thoracic, visceral and vascular surgery as well as practical skills in the fields of neurosurgery and oral and maxillofacial surgery are required. Additionally, it is of vital importance to ensure the availability of sufficient tactical and strategic medical evacuation capabilities for the wounded.  相似文献   
110.

Objective

To investigate the impact of intermittent interleukin‐2 (IL‐2) plus combination antiretroviral therapy (cART) on HIV‐1 entry co‐receptor use.

Methods

Primary HIV‐1 isolates were obtained from 54 HIV‐1‐positive individuals at baseline and after 12 months using co‐cultivation of peripheral blood mononuclear cells (PBMC) with activated PBMC of HIV‐negative healthy donors. HIV‐1 co‐receptor use was determined on U87‐CD4 cells.

Results

Fourteen out of the 21 (67%) IL‐2‐treated individuals harbouring a primary CCR5‐dependent (R5) HIV‐1 isolate at baseline confirmed an R5 virus isolation after 12 months in contrast to 3 out of 7 (43%) of those receiving cART only. After 12 months, only 1 R5X4 HIV‐1 isolate was obtained from 21 cART+IL‐2‐treated individuals infected with an R5 virus at entry (5%) vs. 2/7 (29%) patients receiving cART alone, as confirmed by a 5‐year follow‐up on some individuals.

Conclusions

Intermittent IL‐2 administration plus cART may prevent evolution towards CXCR4 usage in individuals infected with R5 HIV‐1.
  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