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   2998927篇
  免费   232705篇
  国内免费   5163篇
耳鼻咽喉   43510篇
儿科学   89160篇
妇产科学   78645篇
基础医学   422847篇
口腔科学   88229篇
临床医学   270630篇
内科学   584627篇
皮肤病学   61410篇
神经病学   247350篇
特种医学   119181篇
外国民族医学   941篇
外科学   461741篇
综合类   68310篇
现状与发展   2篇
一般理论   1156篇
预防医学   232908篇
眼科学   70607篇
药学   227425篇
  7篇
中国医学   5869篇
肿瘤学   162240篇
  2018年   29822篇
  2016年   25532篇
  2015年   28912篇
  2014年   41214篇
  2013年   62366篇
  2012年   84281篇
  2011年   88850篇
  2010年   52399篇
  2009年   50190篇
  2008年   85014篇
  2007年   90114篇
  2006年   91469篇
  2005年   89026篇
  2004年   85833篇
  2003年   82728篇
  2002年   81647篇
  2001年   145864篇
  2000年   151099篇
  1999年   127578篇
  1998年   34955篇
  1997年   31557篇
  1996年   31374篇
  1995年   30176篇
  1994年   28337篇
  1993年   26311篇
  1992年   101960篇
  1991年   98371篇
  1990年   95022篇
  1989年   91949篇
  1988年   85004篇
  1987年   83393篇
  1986年   78832篇
  1985年   75384篇
  1984年   56243篇
  1983年   47965篇
  1982年   28007篇
  1981年   24831篇
  1980年   23208篇
  1979年   52144篇
  1978年   36250篇
  1977年   30772篇
  1976年   28313篇
  1975年   30244篇
  1974年   37208篇
  1973年   35288篇
  1972年   33187篇
  1971年   30871篇
  1970年   29083篇
  1969年   27225篇
  1968年   24717篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
73.
74.
OBJECTIVE: To explore the presence and grade of denervation in three mimic muscles in facial nerve palsy. METHODS: The frontalis, orbicularis oculi (OO), and mentalis muscles were explored in 54 patients with Bell's palsy, after 30 days from the beginning of symptoms. Concentric needle electromyography, including fibrillation detection, was performed in the three muscles on the affected side. Compound muscle action potentials (CMAP) were recorded on both sides and a CMAP ratio was calculated from each muscle. The House-Brackman scale was used to assess the initial clinical evaluation and the follow-up until recovery. RESULTS: Fibrillation was recorded in 32 patients on the 30th day after the onset and was present in 100% of mentalis and in 90% of frontalis, but in only 34% of OO, a statistically significant difference. The grade of fibrillation in OO was also statistically lower from those in the other two muscles. The 32 patients were grouped according to the presence (A) or not (B) of fibrillation in OO. In group A, CMAP ratios (affected/normal side) did not differ significantly among the three muscles. However, in group B they were significantly greater in OO and frontalis than in mentalis. In between-group comparison, group B muscles had significantly higher CMAP ratios, lower degree of fibrillation, and better functional recovery. CONCLUSION: In facial palsy, the presence and grade of fibrillation in OO are lower than in frontalis and mentalis muscles and prognosis is more favorable for the non-fibrillating OO group of patients.  相似文献   
75.
76.
77.
78.
79.
AIM: Cardiovascular risk factors can be present in children and young adults. We previously found abnormal microvascular function in children who had glucose intolerance and insulin resistance. The aim of the present study was to investigate whether they also have abnormalities in left ventricular mass (LVM) and arterial stiffness. METHODS: We measured heart dimensions and LVM using echocardiography, and arterial stiffness using pulse wave analysis in 23 children with good glucose handling (postfeeding glucose: 3.9 to 5 mmol/L) and 21 with poor glucose handling (7.7 to 11.4 mmol/L). RESULTS: The time to pulse reflection was slightly shorter in the poorer glucose handlers (mean+/-SD: 143+/-10 vs 153+/-20 ms, P=0.04), suggestive of increased arterial stiffness. Also in this group, there were significant relationships between intraventricular septal thickness, blood pressure and body mass index, but not in the normal glucose handlers. CONCLUSIONS: We have found that normal children who are in the lowest quintile of glucose tolerance in comparison with their peers are exhibiting the first signs of arterial stiffening. In addition, we have seen the beginnings of a relationship between blood pressure, body mass index and left ventricular enlargement in this group. While these changes may not yet be clinically significant, their emergence might be further evidence of early predisposition to cardiovascular disease.  相似文献   
80.
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