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   1311883篇
  免费   98317篇
  国内免费   2029篇
耳鼻咽喉   18711篇
儿科学   43294篇
妇产科学   38825篇
基础医学   192724篇
口腔科学   36259篇
临床医学   113428篇
内科学   258063篇
皮肤病学   26996篇
神经病学   102035篇
特种医学   51116篇
外国民族医学   367篇
外科学   202438篇
综合类   27234篇
现状与发展   1篇
一般理论   328篇
预防医学   96633篇
眼科学   29630篇
药学   100725篇
  1篇
中国医学   2540篇
肿瘤学   70881篇
  2018年   12510篇
  2016年   10656篇
  2015年   12273篇
  2014年   16891篇
  2013年   25701篇
  2012年   35377篇
  2011年   37834篇
  2010年   22270篇
  2009年   20945篇
  2008年   36625篇
  2007年   39628篇
  2006年   40137篇
  2005年   39387篇
  2004年   37931篇
  2003年   36880篇
  2002年   36445篇
  2001年   59300篇
  2000年   60785篇
  1999年   51737篇
  1998年   14747篇
  1997年   13210篇
  1996年   13417篇
  1995年   12715篇
  1994年   12109篇
  1993年   11172篇
  1992年   41848篇
  1991年   41164篇
  1990年   40675篇
  1989年   39420篇
  1988年   36762篇
  1987年   36029篇
  1986年   34375篇
  1985年   32831篇
  1984年   24462篇
  1983年   21263篇
  1982年   12717篇
  1981年   11208篇
  1979年   23078篇
  1978年   16217篇
  1977年   14012篇
  1976年   13247篇
  1975年   14430篇
  1974年   16965篇
  1973年   16338篇
  1972年   15583篇
  1971年   14468篇
  1970年   13418篇
  1969年   12927篇
  1968年   12172篇
  1967年   10641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