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   1302876篇
  免费   95969篇
  国内免费   2116篇
耳鼻咽喉   18480篇
儿科学   42952篇
妇产科学   38545篇
基础医学   191170篇
口腔科学   37132篇
临床医学   110443篇
内科学   257325篇
皮肤病学   27416篇
神经病学   101624篇
特种医学   50455篇
外国民族医学   366篇
外科学   199871篇
综合类   26621篇
现状与发展   1篇
一般理论   321篇
预防医学   95718篇
眼科学   29503篇
药学   99994篇
  1篇
中国医学   2651篇
肿瘤学   70372篇
  2018年   13191篇
  2016年   10925篇
  2015年   12689篇
  2014年   17431篇
  2013年   26118篇
  2012年   36228篇
  2011年   38766篇
  2010年   22615篇
  2009年   21190篇
  2008年   36899篇
  2007年   39831篇
  2006年   40139篇
  2005年   39239篇
  2004年   37595篇
  2003年   36420篇
  2002年   35821篇
  2001年   58196篇
  2000年   59640篇
  1999年   50773篇
  1998年   14359篇
  1997年   12927篇
  1996年   13144篇
  1995年   12406篇
  1994年   11812篇
  1993年   10906篇
  1992年   41025篇
  1991年   40386篇
  1990年   39906篇
  1989年   38725篇
  1988年   36123篇
  1987年   35360篇
  1986年   33731篇
  1985年   32145篇
  1984年   23931篇
  1983年   20828篇
  1982年   12388篇
  1981年   10935篇
  1979年   22637篇
  1978年   15883篇
  1977年   13731篇
  1976年   12976篇
  1975年   14207篇
  1974年   16685篇
  1973年   16080篇
  1972年   15322篇
  1971年   14225篇
  1970年   13202篇
  1969年   12721篇
  1968年   11972篇
  1967年   10459篇
排序方式: 共有10000条查询结果,搜索用时 109 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