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   1304篇
  免费   76篇
  国内免费   6篇
耳鼻咽喉   13篇
儿科学   57篇
妇产科学   83篇
基础医学   153篇
口腔科学   37篇
临床医学   109篇
内科学   284篇
皮肤病学   12篇
神经病学   94篇
特种医学   138篇
外科学   82篇
综合类   13篇
一般理论   1篇
预防医学   57篇
眼科学   6篇
药学   60篇
  1篇
中国医学   1篇
肿瘤学   185篇
  2023年   7篇
  2022年   13篇
  2021年   33篇
  2020年   11篇
  2019年   21篇
  2018年   31篇
  2017年   25篇
  2016年   32篇
  2015年   37篇
  2014年   38篇
  2013年   41篇
  2012年   62篇
  2011年   74篇
  2010年   40篇
  2009年   36篇
  2008年   76篇
  2007年   80篇
  2006年   58篇
  2005年   61篇
  2004年   56篇
  2003年   59篇
  2002年   45篇
  2001年   30篇
  2000年   18篇
  1999年   20篇
  1998年   30篇
  1997年   29篇
  1996年   31篇
  1995年   33篇
  1994年   22篇
  1993年   20篇
  1992年   13篇
  1991年   8篇
  1990年   14篇
  1989年   18篇
  1988年   28篇
  1987年   19篇
  1986年   14篇
  1985年   15篇
  1984年   9篇
  1983年   4篇
  1982年   4篇
  1981年   9篇
  1980年   4篇
  1979年   6篇
  1978年   6篇
  1967年   4篇
  1959年   4篇
  1958年   4篇
  1956年   4篇
排序方式: 共有1386条查询结果,搜索用时 15 毫秒
1.
2.
3.
A child had the characteristic clinical and EEG pattern of migrating partial seizures in infancy with left temporal lobe atrophy, hippocampal sclerosis and cortical-subcortical blurring.Seizures were drug-resistant, with recurring episodes of status epilepticus. The child developed microcephaly with arrest of psychomotor development. Focal brain lesions, in the context of migrating partial seizures, have not been previously reported.[Published with video sequences].  相似文献   
4.
Solitary bronchioloalveolar carcinoma: CT criteria   总被引:14,自引:0,他引:14  
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis.  相似文献   
5.
6.
7.
8.
9.
Abstract— The anticonvulsant action of midazolam and clonazepam was studied in 168 immature rats in three age groups (12, 18 and 25 days old). Epileptic after-discharges of the spike-and-wave type accompanied by clonic seizures of facial and forelimb muscles induced by stimulation of sensorimotor cortex were used as a model. The solvent used for clonazepam exhibited a tendency to anticonvulsant action in 12-day-old rats. On the contrary, a proconvulsant action was seen in 25-day-old animals. The action of both benzodiazepines was identical and did not change substantially during development. The highest dose used (1 mg kg?1, i.p.) shortened the duration of epileptic after-discharges, the two lower doses (0·1 and 0·02 mg kg?1, i.p.) suppressed the progressive prolongation with repeated stimulations seen under control conditions. Motor correlates of stimulation remained practically uninfluenced by the two benzodiazepines, myoclonic seizures accompanying epileptic after-discharges were attenuated by the highest dose of both drugs.  相似文献   
10.
After a 3-month, single-blind, run-in period, 151 patients with intermittent claudication were randomly allocated to receive the antiplatelet agent ticlopidine (250 mg twice per day) or an identical placebo. One hundred and twenty patients completed the double-blind phase of the trial, which lasted 21 months. The primary analysis was performed according to the "intention-to-treat principle" in all 151 enrolled patients. There was, continuing on from the third month after randomization, a progressive and sustained improvement of the pain-free and maximum walking distances in the two treatment groups that was significantly greater in the ticlopidine group. The ankle-arm systolic blood pressure ratio at rest and after exercise increased in a significant manner in the ticlopidine group only. In a secondary analysis, with exclusion of 25 patients because of protocol violations at selection, consistently significant differences in favor of the ticlopidine group were still observed for maximum walking distance and systolic ankle-arm blood pressure ratio, both at rest and after exercise. No major side effects were reported in the treated group. It is concluded that long-term treatment with ticlopidine improves walking ability and ankle systolic blood pressure in patients with claudication.  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