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   968篇
  免费   53篇
  国内免费   4篇
耳鼻咽喉   3篇
儿科学   18篇
妇产科学   6篇
基础医学   116篇
口腔科学   22篇
临床医学   59篇
内科学   198篇
皮肤病学   24篇
神经病学   79篇
特种医学   45篇
外科学   160篇
综合类   6篇
预防医学   69篇
眼科学   4篇
药学   84篇
肿瘤学   132篇
  2024年   2篇
  2023年   17篇
  2022年   39篇
  2021年   53篇
  2020年   27篇
  2019年   29篇
  2018年   32篇
  2017年   20篇
  2016年   21篇
  2015年   24篇
  2014年   28篇
  2013年   35篇
  2012年   62篇
  2011年   56篇
  2010年   31篇
  2009年   27篇
  2008年   49篇
  2007年   42篇
  2006年   48篇
  2005年   44篇
  2004年   37篇
  2003年   26篇
  2002年   31篇
  2001年   20篇
  2000年   14篇
  1999年   22篇
  1998年   5篇
  1997年   6篇
  1996年   12篇
  1995年   9篇
  1994年   4篇
  1993年   8篇
  1992年   23篇
  1991年   20篇
  1990年   10篇
  1989年   9篇
  1988年   16篇
  1987年   14篇
  1986年   14篇
  1985年   7篇
  1984年   3篇
  1983年   4篇
  1982年   2篇
  1979年   4篇
  1978年   2篇
  1972年   3篇
  1971年   2篇
  1968年   1篇
  1967年   4篇
  1965年   1篇
排序方式: 共有1025条查询结果,搜索用时 0 毫秒
101.
102.
103.
We describe a patient who survived for a prolonged period after repeated resections of pulmonary metastases from gastric cancer. A 59-year-old man underwent a distal gastrectomy for gastric cancer. A right middle lobectomy and a left lower lobectomy were performed for metastases from gastric cancer at 34 months and 82 months after the initial gastric resection, respectively. The patient died of cerebral infarction 65 months after the first lung resection, with no further relapse. To our knowledge, long-term survival after resection of pulmonary metastases from gastric cancer has only been reported in 3 patients previously. We herein review the literature and discuss the role of surgery in such patients.  相似文献   
104.
105.
106.
Pharmaceutical Research - Biologics are structurally heterogeneous and can undergo biotransformation in the body. Etanercept (ETN) is a fusion protein composed of a soluble tumor necrosis factor...  相似文献   
107.
Perospirone, a serotonin 5-HT2A and dopamine D2 receptor antagonist, is metabolized to ID-15036 by CYP3A4 and the elimination half-life (T1/2) for the latter is longer than the former. The active metabolite ID-15036 is an 8-times weaker D2 antagonist than perospirone, although it has a high affinity for 5-HT2A receptor. In this study, we measured the plasma concentrations of perospirone and ID-15036 in the long-term stable schizophrenic patients with a single dose of perospirone at bedtime. The mean level of perospirone at 11-15 h after a last dosing was much lower (0.49 ng/ml) than that of ID-15036 (2.89 ng/ml). These results show that a long-term perospirone monotherapy with a single dose at bedtime is effective for the maintenance treatment of chronic schizophrenia and also suggest the possibility that intermittent D2 receptor blockade may be sufficient for effective relapse prevention.  相似文献   
108.
Background Although perioperative immune-enhancing enteral formula (IEEF) is effective to decrease the rate of infectious complications, it is not clear whether perioperative use of IEEF decreases the incidence of postoperative complications and improves clinical outcome in patients who have undergone esophagectomy. A prospective randomized clinical trial was performed to examine the effects of perioperative IEEF on nutritional and immunological status in patients with esophageal carcinoma who have been treated with esophagectomy. Methods A total of 30 patients were randomly assigned to two groups, each receiving 3 days of preoperative and postoperative enteral nutrition through jejunostomy started within 24 h after operation, either with immune-enhancing enteral formula (group IEEF, n = 16) or with regular polymeric enteral formula (group C, n = 14). Preoperative and postoperative nutritional and immunological parameters and clinical outcome were examined. Results A significant increase in the serum concentration of ornithine was noted in group IEEF and it peaked at 5 days after surgery. The equivalent values were significantly lower in group C. There was no difference in serum dochosahexaic acid between the two groups. The n−3/n−6 fatty acid ratio in group IEEF was significantly higher than in group C at 7 days after surgery. Peripheral percent lymphocyte fraction and total lymphocyte count in group IEEF were both significantly higher than those in group C. While T cell fraction of peripheral lymphocytes in group IEEF at 3 days after surgery, B cell fraction in group IEEF at 5 and 7 days after surgery was significantly higher than those in group C, suggesting that perioperative IEEF caused a shift towards B cell proliferation. Conclusions Perioperative use of IEEF caused a significant increase in the total lymphocyte count at 3 and 5 days after operation and caused a shift toward B cell proliferation, which may possibly be beneficial to decrease the incidence of postoperative infectious complications.  相似文献   
109.
This cross‐sectional study aimed to investigate the association of periodontal status with occlusal force and food acceptability. We hypothesised that mastication deteriorated with reduced periodontal support, even when posterior occlusal contacts with natural teeth were maintained and the patients remained clinically asymptomatic. Participants were 482 independently living 69‐71‐year‐olds, classified as Eichner's group A, having no mobile teeth and no periodontal symptoms. The periodontal probing depth (PPD) and restoration status of each tooth were examined. Occlusal force in the intercuspal position was measured with pressure‐sensitive films. Food acceptability was evaluated from the difficulty experienced in chewing apples, grilled beef, and hard rice crackers. Multivariate regression analysis was performed to investigate the association of periodontal status with occlusal force and food acceptability. A P‐value of <0·05 was considered statistically significant. Multiple linear regression analysis showed that occlusal force had significant negative associations with maximal PPD (standardised partial regression coefficient (β) = ?0·121) after controlling for gender, handgrip strength, number of teeth, and percentage of restored teeth. Approximately 15% of participants were included in the compromised food acceptability group. Logistic regression analyses showed that compromised food acceptability was significantly associated with PPD, after controlling for gender, number of teeth, and percentage of restored teeth. Periodontal probing depth (PPD) was significantly correlated with occlusal force and self‐rated food acceptability after controlling for the possible confounding factors in septuagenarians, even those with complete posterior occlusal contacts and no tooth mobility.  相似文献   
110.
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