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   3428820篇
  免费   291136篇
  国内免费   13291篇
耳鼻咽喉   46816篇
儿科学   109434篇
妇产科学   89360篇
基础医学   547657篇
口腔科学   92955篇
临床医学   313332篇
内科学   606475篇
皮肤病学   91484篇
神经病学   293676篇
特种医学   133903篇
外国民族医学   288篇
外科学   524096篇
综合类   102287篇
现状与发展   24篇
一般理论   2361篇
预防医学   294764篇
眼科学   78049篇
药学   235046篇
  26篇
中国医学   9326篇
肿瘤学   161888篇
  2021年   54865篇
  2020年   34972篇
  2019年   57877篇
  2018年   71194篇
  2017年   54307篇
  2016年   59707篇
  2015年   73885篇
  2014年   108096篇
  2013年   173356篇
  2012年   93689篇
  2011年   94149篇
  2010年   116854篇
  2009年   121243篇
  2008年   81408篇
  2007年   84838篇
  2006年   94748篇
  2005年   90539篇
  2004年   92107篇
  2003年   82787篇
  2002年   72642篇
  2001年   102567篇
  2000年   95208篇
  1999年   95314篇
  1998年   64624篇
  1997年   62670篇
  1996年   60807篇
  1995年   56251篇
  1994年   50514篇
  1993年   47143篇
  1992年   67574篇
  1991年   64813篇
  1990年   61461篇
  1989年   60634篇
  1988年   56467篇
  1987年   55214篇
  1986年   52648篇
  1985年   52234篇
  1984年   48169篇
  1983年   44326篇
  1982年   41704篇
  1981年   39432篇
  1980年   37160篇
  1979年   40666篇
  1978年   36270篇
  1977年   32849篇
  1976年   30127篇
  1975年   29009篇
  1974年   30502篇
  1973年   29607篇
  1972年   27866篇
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
91.
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   

92.
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   
93.
94.
95.
96.
97.
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   
98.
99.
100.
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