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   1269篇
  免费   117篇
  国内免费   9篇
耳鼻咽喉   11篇
儿科学   18篇
妇产科学   6篇
基础医学   241篇
口腔科学   34篇
临床医学   109篇
内科学   340篇
皮肤病学   6篇
神经病学   73篇
特种医学   77篇
外科学   150篇
综合类   9篇
预防医学   46篇
眼科学   43篇
药学   133篇
中国医学   5篇
肿瘤学   94篇
  2023年   16篇
  2022年   20篇
  2021年   61篇
  2020年   31篇
  2019年   44篇
  2018年   53篇
  2017年   29篇
  2016年   42篇
  2015年   42篇
  2014年   37篇
  2013年   45篇
  2012年   77篇
  2011年   83篇
  2010年   46篇
  2009年   24篇
  2008年   51篇
  2007年   39篇
  2006年   41篇
  2005年   58篇
  2004年   50篇
  2003年   45篇
  2002年   34篇
  2001年   20篇
  2000年   18篇
  1999年   26篇
  1998年   14篇
  1997年   9篇
  1996年   9篇
  1993年   9篇
  1992年   19篇
  1991年   26篇
  1990年   24篇
  1989年   20篇
  1988年   18篇
  1987年   35篇
  1986年   31篇
  1985年   38篇
  1984年   21篇
  1983年   12篇
  1982年   11篇
  1981年   3篇
  1980年   4篇
  1979年   14篇
  1978年   4篇
  1976年   3篇
  1973年   4篇
  1972年   3篇
  1971年   5篇
  1970年   4篇
  1967年   4篇
排序方式: 共有1395条查询结果,搜索用时 15 毫秒
31.
Two cases where aberrant tissue was attached to the lower lip mimicking the inferior labial frenum were reported. The frenum-like tissue extended from the gingival margin between the lower left deciduous central and lateral incisors in case 1 and between the lower right deciduous central and lateral incisors in case 2, to the dry lower lip. Histologically, the resected specimen was regarded as normal oral mucosa covered with stratified squamous epithelium, without a clear amniotic band. The frenum-like tissue of the lower lip found in both our patients was diagnosed as a category of oral synechiae, of unknown origin.  相似文献   
32.
33.
Erythropoietic activity in patients with myelodysplastic syndrome (MDS) was evaluated by ferrokinetic measurements. Since the conventional plasma iron turnover of MDS patients increased with plasma iron levels after multiple blood transfusions, erythron transferrin uptake was chosen as a parameter of erythroid marrow activity. Although a correlation was shown between plasma iron level and plasma iron turnover (r = 0.50, 0.01 less than p less than 0.02), no correlation existed between the plasma iron level and erythron transferrin uptake (r = 0.25, p greater than 0.1). Erythron transferrin uptake, independent of plasma iron, was significantly higher in MDS patients than in normal subjects (110.6 +/- 67.6 and 67.6 +/- 18.8 mumol/l/dl, respectively; 0.01 less than p less than 0.02). An increased erythropoiesis occurring concomitantly with morphologically normal or increased erythroid cellularity was demonstrated in patients with MDS. The measurement of erythron transferrin uptake might be valuable as an accurate expression of erythroid activity in the hyperferremic state.  相似文献   
34.
A 38-year-old woman was admitted with superior mesenteric vein (SMV) thrombosis, which was refractory to anticoagulation therapy. The plasma antithrombin activity was decreased and hardly compensated by concentrated antithrombin preparation due to high consumption rate. However, successful anticoagulation was achieved by administration of direct thrombin inhibitor, argatroban. Family studies of antithrombin activity revealed that she had type I congenital antithrombin deficiency. A novel heterozygous mutation in the gene for antithrombin (single nucleotide T insertion at 7916 and 7917, Glu 272 to stop in exon 4) was identified. Argatroban administration would be effective in the treatment of congenital antithrombin deficiency with SMV thrombosis.  相似文献   
35.
36.
OBJECTIVES:  Nonalcoholic fatty liver disease (NAFLD) is increasing in prevalence worldwide. This study aimed to validate the NAFLD fibrosis score in the Chinese population.
METHODS:  NAFLD patients were prospectively recruited for liver biopsy and blood tests. The NAFLD fibrosis score was calculated as −1.675 + 0.037 × age (yr) + 0.094 × BMI (kg/m2) + 1.13 × impaired fasting glucose/diabetes (yes = 1, no = 0) + 0.99 × AST/ALT ratio–0.013 × platelet (×109/L)−0.66 × albumin (g/dL). Advanced fibrosis was defined as stage 3 to 4 fibrosis.
RESULTS:  One hundred sixty-two patients (age 46 ± 10 yr, male 59%) were included in the study. Advanced fibrosis was found in 18 (11%) patients. Only 11 of 128 patients with the NAFLD fibrosis score below the proposed low cutoff point (<−1.455) were under-staged, resulting in a high negative predictive value of 91%. Only two patients exceeded the proposed high cutoff point (>0.676), but neither had advanced fibrosis. If the NAFLD fibrosis score was implemented in the Chinese population, 79% of liver biopsies could be avoided.
CONCLUSIONS:  The NAFLD fibrosis score has high negative predictive value in excluding advanced fibrosis in the Chinese population, and can reduce the burden of liver biopsy in the vast majority of cases. Since there were few cases of advanced fibrosis in this cohort, this study had limited power in validating the high cutoff point.  相似文献   
37.
Clinical Rheumatology - Eosinophilic fasciitis (EF) is a rare connective tissue disease that causes inflammation and fibrosis of the fascia, inducing pain and motor dysfunction. Characteristic skin...  相似文献   
38.
39.
Annals of Nuclear Medicine - Amyloid positron emission tomography (PET) can reliably detect senile plaques and fluorinated ligands are approved for clinical use. However, the clinical impact of...  相似文献   
40.
A 45-year-old man who had hypertension, hyperthyroidism, and bronchial asthma was admitted to our hospital because of a low-grade fever and chest pain. The physical findings and laboratory data were almost all within normal limits except for evidence of mild inflammation and liver dysfunction. The chest X-ray findings seemed normal, but a computed tomography (CT) scan showed multiple nodules in both lower lung fields. We suspected the cryptococcosis or lung cancer. Biopsy by video-assisted thoracoscopic surgery (VATS) yielded a diagnosis of multiple intrapulmonary lymph nodes. In cases with the above radiologic findings, careful attention should be paid to making the differential diagnosis between intrapulmonary lymph nodes and primary lung cancer. The promotion of diagnostic imaging and advances in techniques have made it easier to identify small peripheral nodules in the lungs, and we now know of their existence. Solitary intrapulmonary lymph nodes are encountered frequently, but multiple or increasing numbers of nodes, as in our case, are very rare. Moreover, because cases with elevated CEA levels have been reported, differentiation from lung cancer appears to be important.  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