全文获取类型
收费全文 | 283999篇 |
免费 | 25018篇 |
国内免费 | 6637篇 |
专业分类
耳鼻咽喉 | 3756篇 |
儿科学 | 5366篇 |
妇产科学 | 5734篇 |
基础医学 | 23767篇 |
口腔科学 | 8482篇 |
临床医学 | 25052篇 |
内科学 | 27976篇 |
皮肤病学 | 3367篇 |
神经病学 | 16023篇 |
特种医学 | 7291篇 |
外国民族医学 | 19篇 |
外科学 | 24871篇 |
综合类 | 44210篇 |
现状与发展 | 12篇 |
一般理论 | 33篇 |
预防医学 | 34383篇 |
眼科学 | 3736篇 |
药学 | 35257篇 |
407篇 | |
中国医学 | 33767篇 |
肿瘤学 | 12145篇 |
出版年
2024年 | 3782篇 |
2023年 | 5712篇 |
2022年 | 9904篇 |
2021年 | 13039篇 |
2020年 | 12786篇 |
2019年 | 14002篇 |
2018年 | 12473篇 |
2017年 | 11182篇 |
2016年 | 10150篇 |
2015年 | 9528篇 |
2014年 | 18356篇 |
2013年 | 20297篇 |
2012年 | 16794篇 |
2011年 | 18028篇 |
2010年 | 14562篇 |
2009年 | 12628篇 |
2008年 | 11860篇 |
2007年 | 11936篇 |
2006年 | 10276篇 |
2005年 | 8840篇 |
2004年 | 7377篇 |
2003年 | 6710篇 |
2002年 | 5188篇 |
2001年 | 4515篇 |
2000年 | 3874篇 |
1999年 | 3298篇 |
1998年 | 2746篇 |
1997年 | 2572篇 |
1996年 | 2223篇 |
1995年 | 2110篇 |
1994年 | 1838篇 |
1993年 | 1640篇 |
1992年 | 1522篇 |
1991年 | 1368篇 |
1990年 | 1261篇 |
1989年 | 1147篇 |
1988年 | 1026篇 |
1987年 | 881篇 |
1986年 | 903篇 |
1985年 | 2304篇 |
1984年 | 2544篇 |
1983年 | 1594篇 |
1982年 | 2093篇 |
1981年 | 1501篇 |
1980年 | 1351篇 |
1979年 | 1147篇 |
1978年 | 962篇 |
1977年 | 752篇 |
1976年 | 861篇 |
1975年 | 615篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
41.
《Journal of the American College of Cardiology》2020,75(1):93-112
The National Cardiovascular Data Registry PINNACLE (Practice Innovation and Clinical Excellence) Registry is the largest outpatient cardiovascular practice registry in the world. It tracks real-world management and quality of 4 common cardiovascular conditions: heart failure, coronary artery disease, atrial fibrillation, and hypertension. In 2013, the PINNACLE Registry contained information on 2,898,505 patients, cared for by 4,859 providers in 431 practices. By 2017, the registry contained information on 6,040,996 patients, cared for by 8,853 providers in 724 practices. During this time period, care processes for PINNACLE patients generally improved. Among patients with heart failure, combined beta-blocker and renin-angiotensin antagonist medication rates increased from 60.7% to 72.8%. Among patients with coronary artery disease, statin medication rates increased from 66% to 80.1%. Among patients with atrial fibrillation, oral anticoagulation rates increased from 52.7% to 65.2%. In contrast, blood pressure control rates among patients with hypertension were largely stable. PINNACLE data also fueled a variety of quality measurement programs and 51 peer-reviewed publications. 相似文献
42.
Isabel De Bruin Cardoso Lopa Bhattacharjee Claire Cody Joanna Wakia Jade Tachie Menson Maricruz Tabbia 《Vulnerable children and youth studies》2020,15(2):114-123
ABSTRACT Between 2015 and 2018, the RISE Learning Network facilitated learning on approaches, practices, methods, and tools that promote recovery and reintegration of children affected by sexual exploitation. Spanning three regions (Sub-Saharan Africa, South Central Asia, and Latin America and the Caribbean), the RISE Learning Network implemented two learning projects. The first project focused on monitoring (M&E Learning Project) and aimed to generate understanding of approaches and tools that could effectively monitor children and families’ reintegration outcomes. The specific purpose of RISE is to promote learning on reintegration of children affected by sexual exploitation; however, the remit of this Learning Project was to generate evidence on the reintegration of children who have been separated from their families for a range of reasons. This is to ensure that learning from different, but often related, areas of work can be included and compared to strengthen understanding of what successful reintegration of children could look like. The mid- and end-term reviews of the M&E Learning Project have captured lessons learned on how practitioners can approach monitoring of reintegration to mainstream it into their programme cycle. Key lessons learned include the importance of focusing on monitoring outcomes through participatory tools and the benefit of flexible, peer-to-peer learning approaches between practitioners using a variety of monitoring tools. This learning contributes to the nascent evidence base on what effective and efficient capturing of reintegration outcomes on children can look like, in addition to strengthening understanding of what successful reintegration for children and families means. The learnings can inform programming; monitoring, evaluation and learning frameworks; and other interventions around reintegration to ensure the holistic wellbeing of children and families. 相似文献
43.
对于创伤骨科患者来说,急救药品与物品事在急救过程中必不可少的物品。急救药品的管理和存放,也是直接影响急救效果的重要因素。因此现代医疗机构为了进一步提高医疗的安全度,必须要加强对急救药品和急救物品的规范管理,但是在这个过程当中仍然出现了许多问题,整体效果提升度不高。 相似文献
44.
45.
46.
《Vaccine》2020,38(13):2859-2869
To examine the link between meningococcal C (MenC) vaccine size and immunogenic response, a panel of MenC glycoconjugate vaccines were prepared differing in chain length, molar mass and hydrodynamic volume. The preparations consisted of different lengths of MenC polysaccharide (PS) covalently linked to monomeric purified tetanus toxoid (TT) carrier protein using the coupling reagent ethylcarbodiimide hydrochloride (EDC). Size exclusion chromatography with multi-angle light scattering (SEC-MALS) and viscometry analysis confirmed that the panel of MenC-TT conjugates spanned masses of 191,500 to 2,348,000 g/mol, and hydrodynamic radii ranging from 12.1 to 47.9 nm. The two largest conjugates were elliptical in shape, whereas the two smallest conjugates were more spherical. The larger conjugates appeared to fit a model described by multiple TTs with cross-linked PS, typical of lattice-like networks described previously for TT conjugates, while the smaller conjugates were found to fit a monomeric or dimeric TT configuration. The effect of vaccine conjugate size on immune responses was determined using a two-dose murine immunization. The two larger panel vaccine conjugates produced higher anti-MenC IgG1 and IgG2b titres after the second dose. Larger vaccine conjugate size also stimulated greater T-cell proliferative responses in an in vitro recall assay, although cytokines indicative of a T-helper response were not measurable. In conclusion, larger MenC-TT conjugates up to 2,348,000 g/mol produced by EDC chemistry correlate with greater humoral and cellular murine immune responses. These observations suggest that conjugate size can be an important modulator of immune response. 相似文献
47.
48.
49.
The mesopancreas does not have well-defined boundaries but is continuous and connected through its components with the paraaortic area. The mesopancreatic resection margin has been indicated as the primary site for R1 resection after PD in pancreatic head cancer and total mesopancreas excision has been proposed to achieve adequate retropancreatic margin clearance and to minimize the likelihood of R1 resection. However, the anatomy of the mesopancreas requires extended dissection of the paraaortic area to maximize posterior clearance. The artery-first surgical approach has been developed to increase local radicality at the mesopancreatic resection margin. During PD, the artery-first approach begins with dissection of the connective tissues around the SMA. However, the concept of the mesopancreas as a boundless structure that includes circumferential tissues around the SMA, SMV, and paraaortic tissue highlights the need to shift from artery-first PD to mesopancreas-first PD to reduce the risk of R1 resection. From this perspective the “artery-first” approach, which allows for the avoidance of R2 resection risk, should be integrated into the “mesopancreas-first” approach to improve the R0 resection rate.In total mesopancreas excision and mesopancreas-first pancreaticoduodenectomies, the inclusion of the paraaortic area and circumferential area around the SMA in the resection field is necessary to control the tumour spread along the mesopancreatic resection margin rather than to control or stage the spread in the nodal basin. 相似文献
50.
《Respiratory investigation》2021,59(6):837-844
BackgroundUnilateral upper-lung field pulmonary fibrosis (upper-PF), which is radiologically consistent with pleuroparenchymal fibroelastosis, develops after thoracic surgery. In most patients with unilateral upper-PF, aberrant intra-/extra thoracic air commonly emerges and an autopsy shows chronic pleuritis, which indicates that pleural involvement is associated with upper-PF development. If so, there may be patients with unilateral upper-PF who have a history of pleural involvement, including tuberculous pleurisy (TP) or asbestos exposure (AE). This study aimed to examine this supposition.MethodsWe examined the radiological reports of all consecutive patients from 2012 to 2018 to investigate whether there were patients having unilateral upper-PF and a history of TP or AE.ResultsEight patients were included in the study. Five patients had a history of TP, and the remaining three had that of AE. All patients were men and had respiratory symptoms, and seven patients presented with restrictive ventilatory impairment. The interval between TP or last AE and upper-PF development was long, with a median of over 20 years. The upper-PF lesion was commonly located in the right lung, and aberrant intrathoracic air was observed in five patients during their clinical course. Additionally, the upper-PF lesion transformed into a cystic lesion in six patients, which resulted in Aspergillus infection in two patients. The prognosis was poor, with a median overall survival of 38 months.ConclusionsUnilateral upper-PF developed even in patients with a history of pleural involvement. Our results indicate that pleural involvement plays an important role in the development of unilateral upper-PF. 相似文献