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   4234932篇
  免费   341528篇
  国内免费   13903篇
耳鼻咽喉   58934篇
儿科学   135384篇
妇产科学   110771篇
基础医学   654215篇
口腔科学   113851篇
临床医学   384981篇
内科学   765159篇
皮肤病学   106264篇
神经病学   352593篇
特种医学   164512篇
外国民族医学   508篇
外科学   651432篇
综合类   119575篇
现状与发展   23篇
一般理论   2594篇
预防医学   354899篇
眼科学   99453篇
药学   296488篇
  26篇
中国医学   11344篇
肿瘤学   207357篇
  2021年   56018篇
  2020年   35695篇
  2019年   58670篇
  2018年   74167篇
  2017年   56636篇
  2016年   62683篇
  2015年   75665篇
  2014年   110096篇
  2013年   175397篇
  2012年   123404篇
  2011年   129304篇
  2010年   126068篇
  2009年   127168篇
  2008年   115056篇
  2007年   122644篇
  2006年   131196篇
  2005年   126260篇
  2004年   126250篇
  2003年   116601篇
  2002年   105677篇
  2001年   149789篇
  2000年   144606篇
  1999年   134387篇
  1998年   70192篇
  1997年   66285篇
  1996年   64475篇
  1995年   59736篇
  1994年   53821篇
  1993年   50083篇
  1992年   96079篇
  1991年   92682篇
  1990年   89082篇
  1989年   86836篇
  1988年   80044篇
  1987年   78531篇
  1986年   73874篇
  1985年   72991篇
  1984年   61687篇
  1983年   55448篇
  1982年   46038篇
  1981年   43134篇
  1980年   40541篇
  1979年   53111篇
  1978年   44043篇
  1977年   38895篇
  1976年   36271篇
  1975年   36276篇
  1974年   39417篇
  1973年   37642篇
  1972年   35247篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
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   

94.
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   
95.
96.
97.
98.
99.
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   
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