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   1388411篇
  免费   102003篇
  国内免费   2390篇
耳鼻咽喉   19700篇
儿科学   45234篇
妇产科学   39749篇
基础医学   201549篇
口腔科学   37581篇
临床医学   119588篇
内科学   274669篇
皮肤病学   28179篇
神经病学   110239篇
特种医学   53883篇
外国民族医学   369篇
外科学   213899篇
综合类   28328篇
现状与发展   2篇
一般理论   467篇
预防医学   103153篇
眼科学   31670篇
药学   105914篇
  3篇
中国医学   2644篇
肿瘤学   75984篇
  2018年   13921篇
  2016年   11829篇
  2015年   13772篇
  2014年   19114篇
  2013年   29272篇
  2012年   40483篇
  2011年   43355篇
  2010年   25454篇
  2009年   24107篇
  2008年   42180篇
  2007年   45622篇
  2006年   46097篇
  2005年   45637篇
  2004年   43852篇
  2003年   42606篇
  2002年   41788篇
  2001年   59246篇
  2000年   60517篇
  1999年   51910篇
  1998年   15796篇
  1997年   14124篇
  1996年   14142篇
  1995年   13393篇
  1994年   12650篇
  1993年   11742篇
  1992年   41737篇
  1991年   41060篇
  1990年   40548篇
  1989年   39320篇
  1988年   36678篇
  1987年   35884篇
  1986年   34275篇
  1985年   32814篇
  1984年   24738篇
  1983年   21614篇
  1982年   13469篇
  1981年   11913篇
  1980年   11081篇
  1979年   23114篇
  1978年   16441篇
  1977年   14250篇
  1976年   13408篇
  1975年   14605篇
  1974年   17044篇
  1973年   16388篇
  1972年   15545篇
  1971年   14372篇
  1970年   13362篇
  1969年   12868篇
  1968年   12070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