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   1371854篇
  免费   101343篇
  国内免费   2159篇
耳鼻咽喉   19077篇
儿科学   45052篇
妇产科学   39843篇
基础医学   202245篇
口腔科学   38070篇
临床医学   116554篇
内科学   270412篇
皮肤病学   28067篇
神经病学   108651篇
特种医学   53837篇
外国民族医学   381篇
外科学   209638篇
综合类   26941篇
现状与发展   2篇
一般理论   396篇
预防医学   104114篇
眼科学   30544篇
药学   103728篇
  1篇
中国医学   2702篇
肿瘤学   75101篇
  2018年   13865篇
  2017年   10666篇
  2016年   11971篇
  2015年   13744篇
  2014年   18884篇
  2013年   28185篇
  2012年   39403篇
  2011年   41894篇
  2010年   24400篇
  2009年   23237篇
  2008年   40201篇
  2007年   43277篇
  2006年   43682篇
  2005年   42617篇
  2004年   40461篇
  2003年   39194篇
  2002年   38431篇
  2001年   61177篇
  2000年   62698篇
  1999年   53427篇
  1998年   15460篇
  1997年   13816篇
  1996年   14095篇
  1995年   13232篇
  1994年   12541篇
  1993年   11571篇
  1992年   42931篇
  1991年   42111篇
  1990年   41573篇
  1989年   40253篇
  1988年   37591篇
  1987年   36650篇
  1986年   34961篇
  1985年   33279篇
  1984年   24806篇
  1983年   21548篇
  1982年   12768篇
  1981年   11283篇
  1979年   23305篇
  1978年   16300篇
  1977年   14056篇
  1976年   13229篇
  1975年   14478篇
  1974年   17041篇
  1973年   16390篇
  1972年   15616篇
  1971年   14525篇
  1970年   13451篇
  1969年   12955篇
  1968年   12235篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
7.
8.
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   
9.
10.
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