全文获取类型
收费全文 | 19750篇 |
免费 | 1280篇 |
国内免费 | 138篇 |
专业分类
耳鼻咽喉 | 166篇 |
儿科学 | 459篇 |
妇产科学 | 393篇 |
基础医学 | 2341篇 |
口腔科学 | 766篇 |
临床医学 | 1889篇 |
内科学 | 4243篇 |
皮肤病学 | 404篇 |
神经病学 | 1263篇 |
特种医学 | 472篇 |
外国民族医学 | 5篇 |
外科学 | 2595篇 |
综合类 | 510篇 |
一般理论 | 14篇 |
预防医学 | 1639篇 |
眼科学 | 758篇 |
药学 | 1862篇 |
中国医学 | 224篇 |
肿瘤学 | 1165篇 |
出版年
2024年 | 21篇 |
2023年 | 240篇 |
2022年 | 595篇 |
2021年 | 1156篇 |
2020年 | 763篇 |
2019年 | 915篇 |
2018年 | 1082篇 |
2017年 | 767篇 |
2016年 | 825篇 |
2015年 | 854篇 |
2014年 | 1119篇 |
2013年 | 1288篇 |
2012年 | 1748篇 |
2011年 | 1794篇 |
2010年 | 1059篇 |
2009年 | 818篇 |
2008年 | 1169篇 |
2007年 | 1045篇 |
2006年 | 871篇 |
2005年 | 741篇 |
2004年 | 573篇 |
2003年 | 476篇 |
2002年 | 411篇 |
2001年 | 64篇 |
2000年 | 73篇 |
1999年 | 70篇 |
1998年 | 54篇 |
1997年 | 50篇 |
1996年 | 52篇 |
1995年 | 39篇 |
1994年 | 22篇 |
1993年 | 36篇 |
1992年 | 28篇 |
1991年 | 30篇 |
1990年 | 30篇 |
1989年 | 27篇 |
1988年 | 23篇 |
1987年 | 13篇 |
1986年 | 18篇 |
1985年 | 13篇 |
1984年 | 22篇 |
1983年 | 21篇 |
1982年 | 18篇 |
1981年 | 13篇 |
1980年 | 16篇 |
1979年 | 13篇 |
1978年 | 12篇 |
1976年 | 10篇 |
1974年 | 9篇 |
1973年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Aaron Pitzele Mohammad Rahimi Eric Armbrecht 《The journal of maternal-fetal & neonatal medicine》2015,28(15):1770-1773
Objective: To determine whether packed red blood cell (PRBC) transfusion affects post-prandial superior mesenteric artery blood flow velocities (SMA BFVs) in very-low birth weight (VLBW) neonates and if so, at what time point after transfusion restoration of previous SMA BFV patterns occurs.Design/Methods: VLBW pre-term neonates, older than 14 days and tolerating bolus enteral feedings administered every 3?h were enrolled in this prospective observational study. Pulsed Doppler ultrasound was used to measure pre- and post-prandial (at 45?min) time-averaged mean, peak and end diastolic velocities (TAMV, PSV, EDV) immediately before and after 15?ml/kg of PRBC transfusion was given over 3?h; patent ductus arteriosus (PDA) status was also evaluated. Subsequent pre- and post-prandial SMA BFVs were recorded 24 and 48?h after the transfusion.Results: Pre- and post-prandial measurements were obtained for 21 out of 25 enrolled infants. Post-prandial SMA BFVs were attenuated during the feedings immediately after transfusion; at 24 and 48?h after transfusion, changes in post-prandial SMA BFVs were similar to those measured prior to transfusion; the presence of the PDA did not affect results.Conclusions: PRBC transfusion blunted SMA BFV responses to feedings immediately after the transfusion with normalization observed 24?h post-transfusion. 相似文献
4.
Ahmed M. Abu El-Asrar Ajmal Ahmad Eef Allegaert Mohammad Mairaj Siddiquei Priscilla W. Gikandi Gert De Hertogh 《Ocular immunology and inflammation》2020,28(4):575-588
ABSTRACT
Purpose
To investigate the expression of IL-11 and its receptor IL-11Rα and to quantify density of CD163+ M2 macrophages in proliferative diabetic retinopathy (PDR). 相似文献5.
6.
7.
8.
9.
10.
Gudrun Aspelund Elaa M Mahdi David H Rothstein Derek S Wakeman 《Journal of gastroenterology and hepatology》2019,34(6):966-974
Choledochal cysts (CDCs) and biliary atresia (BA) are rare pediatric hepatobiliary anomalies that require surgical intervention due to increased risk of malignancy and liver failure, respectively. The underlying disease and operative procedures place patients at risk for long‐term complications, which may continue to affect them into adulthood. Lack of a transitional care model in the health‐care system potentiates the challenges they will face following aging out of their pediatric providers' care. We sought to elucidate the long‐term complications and challenges patients with CDCs and BA face, review the current literature regarding transitioning care, and propose guidelines aiding adult providers in continued care and surveillance of these patients. A literature review was performed to assess short‐term and long‐term complications after surgery and the current standards for transitioning care in patients with a history of CDCs and BA. While transitional programs exist for patients with other gastrointestinal diseases, there are few that focus on CDCs or BA. Generally, authors encourage medical record transmission from pediatric to adult providers, ensuring accuracy of information and compliance with treatment plans. Patients with CDCs are at risk for developing biliary malignancies, cholangitis, and anastomotic strictures after resection. Patients with BA develop progressive liver failure, necessitating transplantation. There are no consensus guidelines regarding timing of follow up for these patients. Based on the best available evidence, we propose a schema for long‐term surveillance. 相似文献