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   3210380篇
  免费   257363篇
  国内免费   9327篇
耳鼻咽喉   45265篇
儿科学   100873篇
妇产科学   86434篇
基础医学   446445篇
口腔科学   91982篇
临床医学   293495篇
内科学   634776篇
皮肤病学   69693篇
神经病学   269600篇
特种医学   129022篇
外国民族医学   1111篇
外科学   489536篇
综合类   76907篇
现状与发展   3篇
一般理论   1298篇
预防医学   262228篇
眼科学   73601篇
药学   233617篇
  9篇
中国医学   5775篇
肿瘤学   165400篇
  2018年   32860篇
  2016年   29193篇
  2015年   32880篇
  2014年   46827篇
  2013年   71053篇
  2012年   92225篇
  2011年   98220篇
  2010年   59261篇
  2009年   57123篇
  2008年   92730篇
  2007年   98770篇
  2006年   99881篇
  2005年   97321篇
  2004年   93387篇
  2003年   90482篇
  2002年   88097篇
  2001年   147393篇
  2000年   152373篇
  1999年   128305篇
  1998年   38630篇
  1997年   34846篇
  1996年   35162篇
  1995年   34631篇
  1994年   32462篇
  1993年   30390篇
  1992年   104889篇
  1991年   101664篇
  1990年   98088篇
  1989年   93969篇
  1988年   87446篇
  1987年   86238篇
  1986年   81620篇
  1985年   78440篇
  1984年   59782篇
  1983年   50944篇
  1982年   31501篇
  1981年   28333篇
  1980年   26661篇
  1979年   55681篇
  1978年   39818篇
  1977年   33536篇
  1976年   31335篇
  1975年   32895篇
  1974年   40084篇
  1973年   38178篇
  1972年   35707篇
  1971年   33084篇
  1970年   30917篇
  1969年   28786篇
  1968年   26479篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
991.
992.
993.
Objectives –  To assess long‐term functioning and disability after traumatic brain injury (TBI). Material and methods –  Individuals (n = 88) in Norrbotten, northern Sweden, who had been transferred for neurosurgical care were assessed with internationally established TBI outcome measures 6–15 years post‐injury. Results –  There was an improvement in overall outcome from discharge from inpatient rehabilitation to follow‐up. Many individuals had a high degree of motor and cognitive functioning, which enabled them to live independently in their own home without assistance, but there remained a disability related to community reintegration and social participation. This affected their productivity and to some degree their marital stability. The remaining disability and reduced productivity were related to the age at injury and the injury severity. Conclusions –  Our data showed that individuals with a TBI can achieve and maintain a high degree of functioning many years after the injury. Increasing age and a greater injury severity contributed to their long‐term disability.  相似文献   
994.
995.
996.
997.
Background  Patients with psoriasis experience remission and gradual reappearance of erythematous and scaly plaques and require individualized treatment over time. A goal of psoriasis treatment is to provide optimal efficacy with a flexible therapeutic regimen that may include treatment pauses.
Objectives  To determine whether patients receiving initial treatment with etanercept who then pause therapy would subsequently recapture response during re-treatment.
Patients and methods  A post-hoc analysis of 226 patients with moderate-to-severe psoriasis from a large multicentre trial was performed. Patients had received etanercept 50 mg twice weekly subcutaneously until a target clinical response had been achieved, then had paused treatment and eventually relapsed. They were then re-treated with etanercept 25 mg twice weekly. The number of patients recapturing a Physician Global Assessment (PGA) of psoriasis rating of ≤ 2 (clear, almost clear or mild) on first re-treatment was assessed. Patient satisfaction during the initial treatment and first re-treatment period was also determined.
Results  A total of 187 (83%) patients recaptured the target clinical response of a PGA of ≤ 2 after re-treatment. The majority of patients [219 of 226 (97%)] reported satisfaction with etanercept re-treatment. No new safety concerns emerged during re-treatment.
Conclusions  In this post-hoc analysis, patients with psoriasis who were re-treated with etanercept 25 mg twice weekly effectively recaptured clinical responses that patients found satisfactory. A flexible treatment option is available to dermatologists and patients for individualized care.  相似文献   
998.
Background  Hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC) is a synthetic fragrance ingredient. Case reports of allergy to HICC appeared in the 1980s, and HICC has recently been included in the European baseline series. Human elicitation dose–response studies performed with different allergens have shown a significant relationship between the patch-test threshold and the repeated open application test (ROAT) threshold, which mimics some real-life exposure situations. Fragrance ingredients are special as significant amounts of allergen may evaporate from the skin.
Objectives  The study aimed to investigate the relationship between elicitation threshold doses at the patch test and the ROAT, using HICC as the allergen. The expected evaporation rate was calculated.
Materials and methods  Seventeen HICC-allergic persons were tested with a dilution series of HICC in a patch test and a ROAT (duration up to 21 days). Seventeen persons with no HICC allergy were included as control group for the ROAT.
Results  The response frequency to the ROAT (in μg HICC cm−2 per application) was significantly higher than the response frequency to the patch test at one of the tested doses. Furthermore the response rate to the accumulated ROAT dose was significantly lower at half of the doses compared with the patch test. The evaporation rate of HICC was calculated to be 72% over a 24-h period.
Conclusions  The ROAT threshold in dose per area per application is lower than the patch test threshold; furthermore the accumulated ROAT threshold is higher than the patch test threshold, which can probably be explained by the evaporation of HICC from the skin in the open test.  相似文献   
999.
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