全文获取类型
收费全文 | 31698篇 |
免费 | 3006篇 |
国内免费 | 53篇 |
专业分类
耳鼻咽喉 | 368篇 |
儿科学 | 1084篇 |
妇产科学 | 681篇 |
基础医学 | 4544篇 |
口腔科学 | 536篇 |
临床医学 | 3318篇 |
内科学 | 6054篇 |
皮肤病学 | 427篇 |
神经病学 | 3128篇 |
特种医学 | 1097篇 |
外国民族医学 | 3篇 |
外科学 | 4030篇 |
综合类 | 784篇 |
一般理论 | 43篇 |
预防医学 | 3193篇 |
眼科学 | 945篇 |
药学 | 2397篇 |
中国医学 | 26篇 |
肿瘤学 | 2099篇 |
出版年
2021年 | 411篇 |
2020年 | 330篇 |
2019年 | 485篇 |
2018年 | 510篇 |
2017年 | 420篇 |
2016年 | 451篇 |
2015年 | 540篇 |
2014年 | 771篇 |
2013年 | 1133篇 |
2012年 | 1618篇 |
2011年 | 1701篇 |
2010年 | 870篇 |
2009年 | 868篇 |
2008年 | 1489篇 |
2007年 | 1661篇 |
2006年 | 1596篇 |
2005年 | 1603篇 |
2004年 | 1584篇 |
2003年 | 1390篇 |
2002年 | 1425篇 |
2001年 | 841篇 |
2000年 | 862篇 |
1999年 | 820篇 |
1998年 | 436篇 |
1997年 | 330篇 |
1996年 | 374篇 |
1995年 | 310篇 |
1994年 | 283篇 |
1993年 | 282篇 |
1992年 | 601篇 |
1991年 | 609篇 |
1990年 | 582篇 |
1989年 | 575篇 |
1988年 | 506篇 |
1987年 | 509篇 |
1986年 | 518篇 |
1985年 | 454篇 |
1984年 | 390篇 |
1983年 | 355篇 |
1982年 | 270篇 |
1981年 | 220篇 |
1980年 | 202篇 |
1979年 | 373篇 |
1978年 | 265篇 |
1977年 | 199篇 |
1976年 | 203篇 |
1975年 | 180篇 |
1974年 | 207篇 |
1973年 | 218篇 |
1972年 | 189篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
1.
2.
3.
4.
5.
A. Cattapan K. Browne D.M. Halperin A. Di Castri P. Fullsack J. Graham J.M. Langley B.A. Taylor S.A. McNeil S.A. Halperin 《Vaccine》2019,37(2):289-295
Introduction/Hypothesis
Recruitment of participants into phase 1 vaccine clinical trials can be challenging since these vaccines have not been used in humans and there is no perceived benefit to the participant. Occasionally, as was the case with a phase 1 clinical trial of an Ebola vaccine in Halifax, Canada, during the 2014–2016 West African Ebola virus outbreak, recruitment is less difficult. In this study, we explored the motivations of participants in two phase 1 vaccine trials that were concurrently enrolling at the same centre and compared the motivations of participants in a high-profile phase 1 Ebola vaccine trial to those in a less high-profile phase 1 adjuvanted seasonal influenza vaccine study.Methods
An online survey which included participants’ prior experience with clinical trials, motivations to participate (including financial incentives), and demographic information was developed to examine the motivations of healthy participants in two phase 1 clinical vaccine trials conducted at the Canadian Center for Vaccinology in Halifax, Nova Scotia. Participants were invited via email to complete the online survey. Readability and clarity were assessed through pilot testing.Results
A total of 49 (55.7%) of 88 participants of the two studies completed the survey (22 [55%] of 40 participants from the Ebola vaccine study and 27 [56.3%] of 48 from the adjuvanted influenza vaccine study). Motivations that were most frequently ranked among participants' top three in both trials were (1) wanting to contribute to the health of others, (2) wanting to participate in something important, (3) wanting to contribute to the advancement of science, and (4) wanting to receive an incentive such as money or a tablet.Conclusions/Recommendations
Although media attention and financial compensation were more often cited by Ebola vaccine trial participants as a reason to participate, both altruistic and self-interested factors were important motivations for participants in their decision to participate in a phase 1 vaccine clinical trial. 相似文献6.
7.
8.
9.
Nathan Scudder James Robertson Sally F. Kelty Simon J. Walsh Dennis McNevin 《The Australian journal of forensic sciences》2020,52(2):235-241
ABSTRACTForensic DNA analysis is dependent on comparing the known and the unknown. Expand the number of known profiles, and the likelihood of a successful match increases. Forensic use of DNA is moving towards comparing samples of unknown origin with publicly available genetic data, such as the records held by genetic genealogy providers. Use of forensic genetic genealogy has yielded a number of recent high-profile successes but has raised ethical and privacy concerns. Navigating family trees is complex, even more so when combined with a comparison of genetic relationships. This intelligence-gathering process has led to occasional false leads, and its use also risks a public backlash, similar to concerns over Cambridge Analytica. A cautious approach to use of this technique is therefore warranted. 相似文献
10.
Shannon M. Rush DPM FACFAS Lawrence A. Ford DPM FACFAS Graham A. Hamilton DPM FACFAS 《The Journal of foot and ankle surgery》2006,45(3):156-160
To evaluate morbidity associated with surgical lengthening of the gastrocnemius, medical records were reviewed retrospectively for 126 patients (mean age, 49.7 years; range, 8-78 years) who had undergone open gastrocnemius recession. Ten patients had isolated recession; 116 had gastrocnemius recession with an additional foot or ankle procedure on the ipsilateral limb. During a mean follow-up period of 19 months (range, 6-50 months), all patients were examined for any postoperative complications associated with the recession. Complications were defined as the presence of postoperative infection, wound dehiscence, nerve problems, decreased muscle strength, scar problems, or calcaneus gait (overlengthening). Uncomplicated outcome was defined as absence of all these complications and return to regular activity, both occurring during a follow-up of at least 6 months. Postsurgical complications developed in 9 (6%) of the 126 patients: 6 (4%) had scar problems, 2 (1.33%) had wound dehiscence, 2 (1.33%) had infection, 3 (2%) had nerve problems, and 1 (0.67%) developed complex regional pain syndrome. No patient complained of either a limp or gait disturbance. Neither persistent decrease in muscle strength nor calcaneus gait was seen. These data suggest that the open gastrocnemius recession procedure has low associated morbidity. 相似文献