全文获取类型
收费全文 | 10854篇 |
免费 | 1279篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 372篇 |
妇产科学 | 949篇 |
基础医学 | 807篇 |
口腔科学 | 76篇 |
临床医学 | 4092篇 |
内科学 | 1569篇 |
皮肤病学 | 117篇 |
神经病学 | 646篇 |
特种医学 | 185篇 |
外科学 | 753篇 |
综合类 | 78篇 |
一般理论 | 9篇 |
预防医学 | 1355篇 |
眼科学 | 151篇 |
药学 | 343篇 |
1篇 | |
中国医学 | 5篇 |
肿瘤学 | 583篇 |
出版年
2024年 | 14篇 |
2023年 | 207篇 |
2022年 | 75篇 |
2021年 | 186篇 |
2020年 | 203篇 |
2019年 | 184篇 |
2018年 | 328篇 |
2017年 | 353篇 |
2016年 | 418篇 |
2015年 | 371篇 |
2014年 | 487篇 |
2013年 | 659篇 |
2012年 | 576篇 |
2011年 | 718篇 |
2010年 | 471篇 |
2009年 | 577篇 |
2008年 | 669篇 |
2007年 | 640篇 |
2006年 | 615篇 |
2005年 | 548篇 |
2004年 | 556篇 |
2003年 | 512篇 |
2002年 | 497篇 |
2001年 | 145篇 |
2000年 | 91篇 |
1999年 | 161篇 |
1998年 | 184篇 |
1997年 | 193篇 |
1996年 | 184篇 |
1995年 | 158篇 |
1994年 | 121篇 |
1993年 | 107篇 |
1992年 | 89篇 |
1991年 | 78篇 |
1990年 | 88篇 |
1989年 | 67篇 |
1988年 | 58篇 |
1987年 | 41篇 |
1986年 | 36篇 |
1985年 | 54篇 |
1984年 | 42篇 |
1983年 | 49篇 |
1982年 | 48篇 |
1981年 | 36篇 |
1980年 | 41篇 |
1979年 | 26篇 |
1978年 | 39篇 |
1977年 | 22篇 |
1976年 | 24篇 |
1975年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
11.
12.
13.
14.
15.
16.
Robin L. Bissinger MSN RNC NNP Cheryl A. Carlson MS RNC NNP 《Newborn and Infant Nursing Reviews》2006,6(2):87
Surfactant, a complex substance containing specific proteins and phospholipids, is essential for gas exchange in the lungs. Research shows that surfactant not only lowers surface tension, but also plays a role in host defense. Surfactant replacement therapy is a cornerstone in the treatment of respiratory distress syndrome in premature infants. New information on endogenous surfactant composition including surfactant apoproteins has led to advances in the surfactant replacement products currently available. Because of the success of surfactant deficiency treatment in neonates, surfactant replacement therapy has been studied in both the pediatric and adult population for the treatment of other respiratory disorders. This article describes the composition, metabolism, and function of endogenous surfactant and other uses of surfactant replacement therapies in neonates. 相似文献
17.
18.
19.
20.
Heung Bae Kim James J Pomposelli Craig W Lillehei Roger L Jenkins Maureen M Jonas Laura E Krawczuk Steven J Fishman 《Liver transplantation》2005,11(11):1389-1394
Extrahepatic portal vein thrombosis (EHPVT) may occur in children or adults and usually comes to clinical attention due to complications of portal hypertension such as variceal hemorrhage. A variety of standard surgical techniques exist to manage these patients, but when these fail surgical options are limited. We describe two novel portosystemic shunts that utilize the gonadal vein as an autologous conduit. Four patients were evaluated for EHPVT with variceal bleeding. None of the patients were candidates for a standard splenorenal shunt due to prior surgical procedures. The first patient underwent a left mesogonadal shunt and the remaining 3 patients underwent a right mesogonadal shunt. Postoperative ultrasound or computed tomography (CT) scan confirmed early patency of the shunt in each patient. There have been no further episodes of variceal hemorrhage with follow-up of 3.5 years in the child who underwent the left mesogonadal shunt, and 17, 19, and 20 months in the patients who underwent the right mesogonadal shunt. Three of the 4 shunts remain patent. One shunt thrombosis occurred in a patient homozygous for the Factor V Leiden mutation despite anticoagulation with coumadin. This is the first report of the successful use of the gonadal vein as an in situ conduit for constructing a portosystemic shunt. In conclusion, the right and left mesogonadal shunts may be useful as salvage operations for patients with EHPVT who have failed standard surgical shunt procedures. 相似文献