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   1383905篇
  免费   103780篇
  国内免费   8607篇
耳鼻咽喉   19369篇
儿科学   43825篇
妇产科学   38588篇
基础医学   197197篇
口腔科学   37256篇
临床医学   119979篇
内科学   267217篇
皮肤病学   27827篇
神经病学   104510篇
特种医学   54639篇
外国民族医学   391篇
外科学   210319篇
综合类   47550篇
现状与发展   28篇
一般理论   310篇
预防医学   101825篇
眼科学   31014篇
药学   108749篇
  107篇
中国医学   8724篇
肿瘤学   76868篇
  2021年   11763篇
  2018年   14679篇
  2017年   11985篇
  2016年   13115篇
  2015年   16309篇
  2014年   22010篇
  2013年   30621篇
  2012年   42909篇
  2011年   45969篇
  2010年   29084篇
  2009年   26734篇
  2008年   42681篇
  2007年   45617篇
  2006年   45369篇
  2005年   43982篇
  2004年   40986篇
  2003年   39704篇
  2002年   38619篇
  2001年   60348篇
  2000年   61312篇
  1999年   51789篇
  1998年   14946篇
  1997年   13533篇
  1996年   13553篇
  1995年   12779篇
  1994年   12125篇
  1993年   11094篇
  1992年   41179篇
  1991年   40528篇
  1990年   40007篇
  1989年   38805篇
  1988年   36186篇
  1987年   35417篇
  1986年   33793篇
  1985年   32172篇
  1984年   23967篇
  1983年   20842篇
  1982年   12403篇
  1979年   22646篇
  1978年   15896篇
  1977年   13737篇
  1976年   12977篇
  1975年   14216篇
  1974年   16693篇
  1973年   16092篇
  1972年   15336篇
  1971年   14235篇
  1970年   13218篇
  1969年   12732篇
  1968年   11979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.
7.
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   
8.
9.
10.
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   
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