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   1078篇
  免费   96篇
  国内免费   3篇
耳鼻咽喉   7篇
儿科学   37篇
妇产科学   30篇
基础医学   132篇
口腔科学   18篇
临床医学   68篇
内科学   254篇
皮肤病学   90篇
神经病学   75篇
特种医学   43篇
外科学   125篇
综合类   5篇
预防医学   68篇
眼科学   16篇
药学   66篇
中国医学   1篇
肿瘤学   142篇
  2024年   1篇
  2023年   12篇
  2022年   28篇
  2021年   67篇
  2020年   38篇
  2019年   47篇
  2018年   53篇
  2017年   47篇
  2016年   50篇
  2015年   38篇
  2014年   64篇
  2013年   61篇
  2012年   86篇
  2011年   102篇
  2010年   45篇
  2009年   35篇
  2008年   80篇
  2007年   77篇
  2006年   60篇
  2005年   39篇
  2004年   39篇
  2003年   26篇
  2002年   22篇
  2001年   4篇
  2000年   6篇
  1999年   7篇
  1998年   3篇
  1997年   2篇
  1994年   3篇
  1993年   2篇
  1992年   6篇
  1991年   5篇
  1990年   4篇
  1989年   1篇
  1988年   5篇
  1987年   1篇
  1986年   2篇
  1985年   2篇
  1984年   1篇
  1979年   2篇
  1977年   2篇
  1967年   1篇
  1911年   1篇
排序方式: 共有1177条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Thrombin-antithrombin III complex (TAT) and plasminogen activator inhibitor (PAI) were measured during liver resection surgery in 8 patients. TAT and PAI activities of patients under liver resection were compared with those of 11 patients under resection of esophageal carcinoma. TAT activity increased during liver resection (P < 0.001) and reached 14 times (P < 0.001) of its control value in the recovery room. PAI activity was very stable during operation, but increased to twice (P < 0.01) of its control value in the recovery room. TAT activity of patients after liver surgery in the recovery room was (P < 0.05) more than twice of that of patients after esophageal surgery. We conclude that hypercoagulable state occurred during liver resection to a greater degree compared with that observed with esophageal surgery, and that its cause might be liver resection itself.  相似文献   
5.
6.
7.
European Journal of Epidemiology - Heavy alcohol consumption in mid-adulthood is an established risk factor of colorectal cancer (CRC). Alcohol use in early adulthood is common, but its association...  相似文献   
8.
Although systemic therapy is the standard treatment for metastatic prostate cancer, a randomized controlled trial showed radiotherapy to the prostate improved overall survival of metastatic prostate cancer patients with the low metastatic burden. Additionally, a randomized phase II trial showed that metastasis-directed therapy for oligo-recurrent prostate cancer improved androgen-deprivation therapy (ADT)-free survival. Therefore, administering radiotherapy to both prostate and metastatic regions might result in better outcomes. Thus, we report the treatment results of radiotherapy to both prostate and metastatic regions. Our institutional database was searched for patients who received radiotherapy to the prostate and metastatic regions. We summarized patient characteristics and treatment efficacy and performed statistical analysis to find possible prognostic factors. A total of 35 patients were included in this study. The median age was 66 years, and the median initial prostate-specific antigen (PSA) level was 32 ng/ml. The Gleason score was 7 in 10 patients, 8 in 13 patients, and 9 in 12 patients. The median radiotherapy dose was 72 Gy to the prostate and 50 Gy to the metastatic bone region. The 8-year overall survival, cause-specific survival, progression-free survival, and freedom from biochemical failure rate were 81, 85, 53, and 57%. Among the 35 patients, 12 were disease-free even after ADT was discontinued. In selected patients with metastatic prostate cancer, ADT and radiotherapy to the prostate and metastatic sites were effective. Patients with good response to ADT may benefit from radiotherapy to both prostate and metastatic regions.  相似文献   
9.
We observed the attacks of nystagmus in a case of infantile spasms and carried out overnight sleep polygraphy. The following findings were obtained:
  • 1 Awake time was prolonged to 56% of TIB, while sleep time was markedly shortened to 44% of TIB. Also REM sleep time was reduced to 20% of SPT and deep slow sleep (stage N3) was absent.
  • 2 Attacks of nystagmus were observed only during wakefulness. At first, fast wave bursts appeared in the right occipital area, and were followed by left-upward deviations of eyeballs, and then the attacks of counterclockwise right-downward rotatory nystagmus. Also the fast wave bursts were succeeded by spreading of fast waves to adjacent areas. At the same time, EMG exhibited elevated muscle action potentials of mentalis and biceps fernoris. During the attacks of nystagmus, there was alteration of respiratory movements.
In NREM sleep, both fast wave bursts and the attacks of nystagmus were not observed. In REM sleep, the fast wave bursts and eye movements were observed but the attacks of nystagmus did not appear. During the fast wave bursts, alteration of respiratory movements were observed. From the results of this study, it was presumed that the brain lesions of this case were extended with severe degree of damage in the great parts of brain containing Cerebral cortex and brain stem.  相似文献   
10.
The association between plasma carotenoids and prostate cancer risk was investigated in a case-control study nested within the prospective Health Professionals Follow-up Study. We matched 450 incident prostate cancer cases diagnosed from 1993-1998 to 450 controls by age, time, month, and year of blood donation. Modest inverse, but not statistically significant, associations were observed among plasma alpha-carotene, beta-carotene, and lycopene concentrations, and overall risk of prostate cancer diagnosis [odds ratio (highest versus lowest quintile; OR), alpha-carotene: OR, 0.67 [95% confidence interval (CI), -0.40-1.09]; beta-carotene: OR, 0.78 (95% CI, 0.48-1.25); lycopene: OR, 0.66 (95% CI, 0.38-1.13)]. The inverse association between plasma lycopene concentrations and prostate cancer risk was limited to participants who were 65 years or older (OR, 0.47; 95% CI, 0.23-0.98) and without a family history of prostate cancer (OR, 0.48; 95% CI, 0.26-0.89). Combining, older age and a negative family history provided similar results (OR, 0.43; 95% CI, 0.18-1.02). Inverse associations between beta-carotene and prostate cancer risk were also found among younger participants (<65 years of age; OR, 0.36; 95% CI, 0.14-0.91; P(trend) = 0.03). Combining dietary intake and plasma data confirmed our results. We found a statistically significant inverse association between higher plasma lycopene concentrations and lower risk of prostate cancer, which was restricted to older participants and those without a family history of prostate cancer. This observation suggests that tomato products may exhibit more potent protection against sporadic prostate cancer rather than those with a stronger familial or hereditary component. In addition, our findings also suggest that among younger men, diets rich in beta-carotene may also play a protective role in prostate carcinogenesis.  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