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   23328篇
  免费   1386篇
  国内免费   103篇
耳鼻咽喉   195篇
儿科学   684篇
妇产科学   580篇
基础医学   3151篇
口腔科学   585篇
临床医学   2076篇
内科学   5292篇
皮肤病学   571篇
神经病学   2439篇
特种医学   652篇
外国民族医学   3篇
外科学   2711篇
综合类   172篇
一般理论   11篇
预防医学   1792篇
眼科学   511篇
药学   1668篇
中国医学   67篇
肿瘤学   1657篇
  2023年   141篇
  2022年   345篇
  2021年   695篇
  2020年   387篇
  2019年   531篇
  2018年   590篇
  2017年   437篇
  2016年   502篇
  2015年   610篇
  2014年   814篇
  2013年   1011篇
  2012年   1655篇
  2011年   1707篇
  2010年   957篇
  2009年   798篇
  2008年   1452篇
  2007年   1408篇
  2006年   1329篇
  2005年   1287篇
  2004年   1121篇
  2003年   1011篇
  2002年   956篇
  2001年   524篇
  2000年   518篇
  1999年   433篇
  1998年   179篇
  1997年   146篇
  1996年   148篇
  1995年   131篇
  1994年   130篇
  1993年   110篇
  1992年   314篇
  1991年   254篇
  1990年   241篇
  1989年   203篇
  1988年   167篇
  1987年   164篇
  1986年   168篇
  1985年   151篇
  1984年   115篇
  1983年   83篇
  1982年   57篇
  1981年   62篇
  1980年   48篇
  1979年   87篇
  1978年   47篇
  1977年   48篇
  1973年   51篇
  1972年   70篇
  1971年   50篇
排序方式: 共有10000条查询结果,搜索用时 14 毫秒
31.
32.
33.
Dopamine agonists have been recommended as early treatment for Parkinson's disease (PD), alone or combined with levodopa. Piribedil is a non-ergot selective D(2)/D(3) agonist with alpha(2) antagonist properties shown to be effective in the treatment of PD. This 12-month international, randomized, double-blind trial aimed to assess the efficacy of piribedil 150 mg versus bromocriptine 25 mg, in early combination with levodopa in Stage I to III PD patients. Motor efficacy was assessed using the Unified Parkinson's Disease Rating Scale (UPDRS III, Items 18-31) as improvement from baseline. Response rate was defined as a 30% improvement. Among the 425 randomly assigned patients, 178 were also included in a substudy on cognitive follow-up evaluated by a dysexecutive syndrome oriented battery. A relevant improvement in UPDRS III over the 12-month study duration was observed both in the piribedil and bromocriptine groups (-7.9 +/- 9.7 points from baseline versus -8.0 +/- 9.5; not significant [n.s.]) with a response rate of 58.4% and 55.3% (n.s.), respectively. Piribedil and bromocriptine resulted in similar improvement on all UPDRS III subscores. Piribedil patients required less levodopa dose increase than those on bromocriptine. Cognitive performance remained generally unchanged in both groups, with a significant effect of piribedil limited to the Wisconsin Card Sorting Test. An overall good tolerability of piribedil was observed. Early combination of piribedil 150 mg with levodopa resulted in significant long-term improvement of all motor symptoms in PD patients insufficiently controlled by levodopa alone. Taking into account both efficacy and acceptability in the long-term, piribedil proved in this bromocriptine controlled study to be an effective and safe treatment for PD.  相似文献   
34.
The chief aim of this study was to maximize flap survival by counteracting the pathophysiological changes occurring during ischemia-reperfusion. Rabbit epigastric skin flaps given 21 hours of ischemia were infused intra-arterially with selected drugs at the start of reperfusion. Compared with control infused ischemic flaps, which had a 33% survival rate on day 7 post-ischemia, significant improvement was found with vasodilators nitrendipine (61%) and prostacyclin (65%) and the thrombolytic agent urokinase (65%); marginal improvement with the free radical scavenger desferrioxamine (53%); but no change with streptokinase (44%), heparin (21%), and ATP-MgCl2 (35%). A drug mixture comprising all of these agents except streptokinase and urokinase produced 87% survival, suggesting an additive effect. Biochemical assays on skin homogenates and blood implicated oxygen free radicals, neutrophil infiltration, and thromboxane in flap failure. These results imply that multiple factors are responsible for ischemic flap failure and that a mixture of drugs needs to be infused to counteract all of the detrimental changes. © 1994 Wiley-Liss, Inc.  相似文献   
35.
We reviewed clinical, EEG, and CT findings of 203 patients with epilepsy due to neurocysticercosis. Seizures were generalized in 121 patients and partial in 82. Thirty-two patients had focal signs and eight had papilledema. Eighty-one had generalized and 16 had focal EEG abnormalities. CT showed parenchymal brain calcifications in 53 patients and cysts in 150. There was an increased rate of focal signs in patients with single cysts as compared with patients with multiple cysts, and focal EEG abnormalities were present only in patients with single cysts. Fifty patients were lost to follow-up. The remaining 153 patients were followed for 28 +/- 6 months; of these, 31 had calcifications and 122 had cysts. Anticonvulsants were started after the first visit in every patient. The 31 patients with calcifications remained free of seizures. Ninety-five of the 122 patients with cysts were also treated with anticysticercal drugs; of these, 79 (83%) had control of seizures. In contrast, only seven (26%) of 27 patients who did not receive anticysticercal drugs had control of seizures, indicating a strong correlation between the use of anticysticercal drugs and seizure control. Finally, of the 21 patients in whom anticonvulsants were withdrawn, 16 had relapses.  相似文献   
36.
Management and survival of meconium ileus. A 30-year review.   总被引:2,自引:0,他引:2       下载免费PDF全文
Cystic fibrosis patients born with meconium ileus (MI) have had an improved outcome over the last three decades. The authors reviewed the impact of surgical management and long-term nutritional care on the survival of patients with MI. Of the 59 cases of MI seen from 1959 to 1989, 48 cases were managed operatively using either the Bishop-Koop ileostomy (BK), the Mikulicz ileostomy, primary resection and anastomosis (RA), or ileostomy. Six-month survival of MI has improved from 37% to 100%. Nonoperative cases (n = 11) had 100% long-term survival. The RA survivors required less late operative intervention (20%) as compared with other surgical patients (81%). A comparison of serial growth percentiles of CF patients with MI with those of their non-MI CF peers showed similar long-term decreases. These data confirm: (1) There is an improved survival for MI independent of the surgical procedure; (2) The BK ileostomy is an effective and time-tested MI treatment; (3) Primary resection and anastomosis in selected cases may have a lower surgical morbidity rate; and (4) Meconium ileus does not adversely affect the long-term nutritional outcome of CF patients.  相似文献   
37.
Albendazole is considered to be the drug of choice for treatment of parenchymal brain cysticercosis. Its efficacy, however, for treatment of subarachnoid cysticerci has not been established, to our knowledge. In this study, we treated four patients who had giant subarachnoid cysticerci with albendazole at daily doses of 15 mg/kg of body weight for 8 days. Computed tomographic studies showed that all cysts disappeared 3 months after the end of treatment. This was associated with marked clinical improvement in every case. Our results indicated that albendazole is highly effective for treatment of this form of the disease.  相似文献   
38.
39.
40.
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