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   1414213篇
  免费   102079篇
  国内免费   2366篇
耳鼻咽喉   20131篇
儿科学   46720篇
妇产科学   40763篇
基础医学   205486篇
口腔科学   42139篇
临床医学   118430篇
内科学   281818篇
皮肤病学   30106篇
神经病学   110725篇
特种医学   54255篇
外国民族医学   388篇
外科学   214872篇
综合类   27704篇
现状与发展   2篇
一般理论   352篇
预防医学   107824篇
眼科学   31677篇
药学   106074篇
  1篇
中国医学   3085篇
肿瘤学   76106篇
  2018年   15915篇
  2017年   11966篇
  2016年   12933篇
  2015年   14947篇
  2014年   20647篇
  2013年   30147篇
  2012年   42510篇
  2011年   45450篇
  2010年   26079篇
  2009年   24263篇
  2008年   42186篇
  2007年   45705篇
  2006年   45668篇
  2005年   45106篇
  2004年   43338篇
  2003年   41594篇
  2002年   39509篇
  2001年   61620篇
  2000年   63095篇
  1999年   53828篇
  1998年   15416篇
  1997年   13792篇
  1996年   14022篇
  1995年   13177篇
  1994年   12589篇
  1993年   11609篇
  1992年   42868篇
  1991年   42257篇
  1990年   41589篇
  1989年   40371篇
  1988年   37624篇
  1987年   36801篇
  1986年   35026篇
  1985年   33397篇
  1984年   24867篇
  1983年   21543篇
  1982年   12794篇
  1981年   11316篇
  1979年   23314篇
  1978年   16337篇
  1977年   14079篇
  1976年   13273篇
  1975年   14630篇
  1974年   17109篇
  1973年   16488篇
  1972年   15663篇
  1971年   14545篇
  1970年   13578篇
  1969年   13080篇
  1968年   12345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.
9.
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   
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