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   4981693篇
  免费   404481篇
  国内免费   16191篇
耳鼻咽喉   70670篇
儿科学   159674篇
妇产科学   130777篇
基础医学   742158篇
口腔科学   137932篇
临床医学   465079篇
内科学   914882篇
皮肤病学   120988篇
神经病学   419367篇
特种医学   195466篇
外国民族医学   968篇
外科学   755197篇
综合类   139080篇
现状与发展   92篇
一般理论   2809篇
预防医学   415042篇
眼科学   117459篇
药学   352124篇
  26篇
中国医学   12989篇
肿瘤学   249586篇
  2021年   57814篇
  2019年   59944篇
  2018年   79102篇
  2017年   61385篇
  2016年   68027篇
  2015年   80398篇
  2014年   117513篇
  2013年   183035篇
  2012年   142144篇
  2011年   150077篇
  2010年   135089篇
  2009年   136371篇
  2008年   135427篇
  2007年   144571篇
  2006年   152928篇
  2005年   146323篇
  2004年   146728篇
  2003年   136350篇
  2002年   124955篇
  2001年   198421篇
  2000年   195019篇
  1999年   175189篇
  1998年   77176篇
  1997年   71681篇
  1996年   69572篇
  1995年   65068篇
  1994年   58622篇
  1993年   54308篇
  1992年   128825篇
  1991年   123758篇
  1990年   119107篇
  1989年   115670篇
  1988年   106509篇
  1987年   104534篇
  1986年   98636篇
  1985年   95978篇
  1984年   77874篇
  1983年   68529篇
  1982年   51693篇
  1981年   47748篇
  1980年   44770篇
  1979年   67715篇
  1978年   53072篇
  1977年   46645篇
  1976年   43264篇
  1975年   44080篇
  1974年   49014篇
  1973年   46947篇
  1972年   43954篇
  1971年   40647篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
101.
Background: Traumatic brain injury (TBI) results in verbal recall deficits and impaired processing of emotion encoded in facial appearance, prosody and the linguistic content of messages. Emotion facilitates memory (emotional memory advantage) for non-brain injured (NBI) individuals but the impact of emotion on verbal recall for linguistically encoded stimuli in TBI has not been explored.

Aims: The purpose of this study was to determine the effects of stimulus emotional content on verbal recall of words and paragraphs in TBI compared to NBI individuals.

Methods and procedures: Six 10-item lists, each with five emotional and five neutral words, and six paragraphs (three emotional, three neutral) were counterbalanced and presented in random order to 20 individuals with TBI and 44 NBI. The number of words from lists and the number of content units from paragraphs were compared for the two groups.

Outcomes and results: The NBI participants recalled more words from the lists and content units from the paragraphs than the individuals with TBI. Both groups recalled significantly more emotional than neutral words. NBI but not TBI participants had significantly greater recall for information in paragraphs with emotional content.

Conclusions: Participants with TBI showed impaired recall of words and paragraph content. Emotion facilitated word and paragraph content recall for neurotypical individuals but emotional memory advantage was limited to words for the TBI participants.  相似文献   

102.
G. Berlin  M. Hammar  L. Tapper 《Platelets》2019,30(4):473-479
Platelets are needed to prevent or arrest bleeding and aggregate at the site of injury upon vascular damage. Platelets express receptors for estrogens which might affect the function of the platelets and their hemostatic ability. The aim was to identify possible differences in platelet function related to age, gender, and phases of the menstrual cycle by use of impedance aggregometry with Multiplate. In the first part of the study, platelet function was assessed in 60 healthy individuals (30 men and 30 women) in each of three age groups (20–25, 40–45, and 60–65 years). In the second part of the study, the platelet function was analyzed on four occasions during the menstrual cycle in women without oral contraceptives (OCs) (n = 17) and compared to 19 women on OCs and 18 men of similar age (20–40 years). For the women on OCs, aggregation was analyzed once during the tablet-free week and once late during the period with OCs. The men were sampled once. Women of younger age (<45 years) had significantly higher agonist-induced aggregation response than both men and post-menopausal women (60–65 years). The agonist-induced aggregation response did not differ between phases of the menstrual cycle or OC use. The results suggest that estradiol and/or progesterone affect spontaneous aggregation since it was found to be lowest in the mid-luteal phase. Spontaneous aggregation was significantly lower in women on OCs than in both men and women without OCs. Our findings indicate that fertile age is associated with higher aggregation response capacity of the platelets, possibly to prevent excessive bleeding during menstruation, but this response capacity is not altered during the menstrual cycle or by use of OCs.  相似文献   
103.
104.
105.
106.
107.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
108.
109.
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