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   195226篇
  免费   18243篇
  国内免费   1674篇
耳鼻咽喉   659篇
儿科学   5387篇
妇产科学   5583篇
基础医学   14919篇
口腔科学   3873篇
临床医学   16941篇
内科学   34353篇
皮肤病学   2012篇
神经病学   12662篇
特种医学   4574篇
外国民族医学   3篇
外科学   15457篇
综合类   8136篇
现状与发展   19篇
一般理论   70篇
预防医学   65323篇
眼科学   1864篇
药学   10206篇
  58篇
中国医学   396篇
肿瘤学   12648篇
  2024年   107篇
  2023年   7626篇
  2022年   10790篇
  2021年   11791篇
  2020年   12785篇
  2019年   8605篇
  2018年   9208篇
  2017年   9586篇
  2016年   9567篇
  2015年   9102篇
  2014年   15093篇
  2013年   13395篇
  2012年   10995篇
  2011年   10664篇
  2010年   10274篇
  2009年   8822篇
  2008年   6791篇
  2007年   6965篇
  2006年   5805篇
  2005年   4804篇
  2004年   4084篇
  2003年   3752篇
  2002年   3561篇
  2001年   3233篇
  2000年   2845篇
  1999年   2679篇
  1998年   841篇
  1997年   796篇
  1996年   702篇
  1995年   559篇
  1994年   576篇
  1993年   485篇
  1992年   1193篇
  1991年   1165篇
  1990年   998篇
  1989年   825篇
  1988年   771篇
  1987年   341篇
  1986年   125篇
  1985年   229篇
  1984年   268篇
  1983年   207篇
  1982年   169篇
  1981年   159篇
  1980年   138篇
  1979年   133篇
  1978年   140篇
  1977年   105篇
  1974年   117篇
  1973年   105篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Although the reproductive calendar is the primary tool for measuring contraceptive dynamics in low-income settings, the reliability of calendar data has seldom been evaluated, primarily due to the lack of longitudinal panel data. In this research, we evaluated the reproductive calendar using data from the Performance Monitoring for Action Project. We used population-based longitudinal data from nine settings in seven countries: Burkina Faso, Nigeria (Kano and Lagos States), Democratic Republic of Congo (Kinshasa and Kongo Central Provinces), Kenya, Uganda, Cote d'Ivoire, and India. To evaluate reliability, we compared the baseline cross-sectional report of contraceptive use (overall and by contraceptive method), nonuse, or pregnancy with the retrospective reproductive calendar entry for the corresponding month, measured at follow-up. We use multivariable regressions to identify characteristics associated with reliability or reporting. Overall, we find that the reliability of the calendar is in the “moderate/substantial” range for nearly all geographies and tests (Kappa statistics between 0.58 and 0.81). Measures of the complexity of the calendar (number of contraceptive use episodes, using the long-acting method at baseline) are associated with reliability. We also find that women who were using contraception without their partners/husband's knowledge (i.e., covertly) were less likely to report reliably in several countries.  相似文献   
3.
4.
5.
The discussion paper will focus on continuity of care relating to previous NZ research, specifically to transitioning complex preterm infants from NICU to home based on parent experiences, and on the practice developments that have occurred, to ensure optimal health outcomes. Previous NZ research discovered parent desire a consistent service delivery for the entire transition journey from NICU and at home.An informative and comprehensive opportunity has occurred for reflective professional practice, evaluation, development and implementation which have transpired in positive change through innovative practice developments and support change implementation in Wellington, NZ. This has resulted in the articulation of a model of care that has both embraced and integrated parental desires for a continuity of care process for complex preterm infants. This has been achieved by having the same Discharge Facilitator/Key Case Manager present within the NICU and external to the NICU for Home-based infants for the entire transition journey.The paper will focus and emphasis additional practice development changes and furthermore, will present a real purpose, for other countries to learn of such practice developments that have exemplified a celebratory success for families of Wellington, NZ.  相似文献   
6.
7.
《Ticks and Tick》2022,13(1):101869
BackgroundAlpha-gal allergy, also known as red meat allergy or alpha-gal syndrome, can present after bites of certain tick species that contain galactose-alpha-1,3-galactose (alpha-gal) carbohydrate. Following this exposure, patients may develop an allergic reaction after mammalian meat consumption. Some heparin products are derived from porcine intestinal tissue, and it is therefore possible that administering these medications to a patient with an alpha-gal allergy may trigger a reaction.ObjectiveThe purpose of this study was to evaluate the incidence of reactions to porcine heparin products in patients with an alpha-gal allergy.MethodsA retrospective case series was conducted by review of electronic medical record data. Patients included were between the ages of 18 and 89 years, with a documented alpha-gal or red meat allergy and an admission to a hospital in the Sentara Healthcare system. The primary outcome was the incidence of allergic reactions upon exposure to heparin products in patients with a documented alpha-gal allergy.ResultsPatients with a documented alpha-gal allergy received a heparin product in 57 of 158 hospital visits (36.1%). Heparin products were tolerated in 56 of the 57 visits (98.3%). The incidence of an alpha-gal reaction to unfractionated heparin was 2.6% (1/39) while the incidence of an alpha-gal reaction to enoxaparin was 0% (0/22).Conclusion and RelevanceHeparin products were associated with a low incidence of alpha-gal reactions among patients with documented alpha-gal allergy. It is possible that enoxaparin poses less of a risk for reaction in these patients compared to unfractionated heparin.  相似文献   
8.
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