全文获取类型
收费全文 | 621901篇 |
免费 | 34407篇 |
国内免费 | 1226篇 |
专业分类
耳鼻咽喉 | 7820篇 |
儿科学 | 19705篇 |
妇产科学 | 14767篇 |
基础医学 | 105015篇 |
口腔科学 | 14455篇 |
临床医学 | 56215篇 |
内科学 | 115725篇 |
皮肤病学 | 13718篇 |
神经病学 | 42404篇 |
特种医学 | 23559篇 |
外国民族医学 | 76篇 |
外科学 | 91107篇 |
综合类 | 9402篇 |
现状与发展 | 2篇 |
一般理论 | 156篇 |
预防医学 | 44030篇 |
眼科学 | 13607篇 |
药学 | 48740篇 |
4篇 | |
中国医学 | 1617篇 |
肿瘤学 | 35410篇 |
出版年
2021年 | 5561篇 |
2019年 | 5416篇 |
2018年 | 7609篇 |
2017年 | 5601篇 |
2016年 | 6391篇 |
2015年 | 7148篇 |
2014年 | 9472篇 |
2013年 | 13985篇 |
2012年 | 20167篇 |
2011年 | 22180篇 |
2010年 | 13051篇 |
2009年 | 11597篇 |
2008年 | 20015篇 |
2007年 | 21881篇 |
2006年 | 21263篇 |
2005年 | 20423篇 |
2004年 | 20280篇 |
2003年 | 19538篇 |
2002年 | 19087篇 |
2001年 | 25890篇 |
2000年 | 26345篇 |
1999年 | 21720篇 |
1998年 | 6321篇 |
1997年 | 5250篇 |
1996年 | 5197篇 |
1995年 | 4909篇 |
1992年 | 16182篇 |
1991年 | 17591篇 |
1990年 | 17443篇 |
1989年 | 17103篇 |
1988年 | 15653篇 |
1987年 | 15406篇 |
1986年 | 14368篇 |
1985年 | 13759篇 |
1984年 | 10225篇 |
1983年 | 8765篇 |
1982年 | 4672篇 |
1979年 | 9577篇 |
1978年 | 6855篇 |
1977年 | 5565篇 |
1976年 | 5897篇 |
1975年 | 7065篇 |
1974年 | 7923篇 |
1973年 | 7671篇 |
1972年 | 7067篇 |
1971年 | 6745篇 |
1970年 | 6266篇 |
1969年 | 5861篇 |
1968年 | 5553篇 |
1967年 | 4955篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
Vasonatrin peptide: a unique synthetic natriuretic and vasorelaxing peptide. 总被引:11,自引:1,他引:10
下载免费PDF全文
![点击此处可从《The Journal of clinical investigation》网站下载免费的PDF全文](/ch/ext_images/free.gif)
C M Wei C H Kim V M Miller J C Burnett Jr 《The Journal of clinical investigation》1993,92(4):2048-2052
This study reports the cardiovascular and renal actions of a novel and newly synthesized 27-amino acid peptide termed vasonatrin peptide (VNP). VNP is a chimera of atrial natriuretic peptide (ANP) and C-type natriuretic peptide (CNP). This synthetic peptide possesses the 22-amino acid structure of CNP, which is a cardiovascular selective peptide of endothelial origin and is structurally related to ANP. VNP also possesses the five-amino acid COOH terminus of ANP. The current study demonstrates both in vitro and in vivo that VNP possesses the venodilating actions of CNP, the natriuretic actions of ANP, and unique arterial vasodilating actions not associated with either ANP or CNP. 相似文献
942.
M Vijaya Lakshmi MRCP G V Sridharan MRCP D Butterworth MRCP 《International journal of clinical practice》1993,47(3):164-165
Gallstones are common and their incidence increases with age.1 Fifty per cent of these stones are in the common bile duct (CBD) in the elderly.2 Most of them are silent but with time there is an increasing chance of developing symptoms which are more likely to be serious in the elderly.3 Failure to relieve mechanical obstruction of bile flow may lead to secondary biliary cirrhosis.4 It has been estimated that on average secondary biliary cirrhosis develops some seven years after the onset of obstruction from a stricture, four and half years after gallstone obstruction and 10 months after the onset of malignant stricture.5 The characteristic features are the pathological findings of portal-portal linkages, with a pattern of monolobular cirrhosis and the preservation of normal vascular relationships.6 Secondary biliary cirrhosis may lead to hepatic insufficiency and portal hypertension with the resultant complications, such as bleeding oesophageal varices, hypersplenism with pancytopenia, ascites and encephalopathy. We describe a patient in whom the diagnosis was not suspected until laparotomy and confirmed only at autopsy. 相似文献
943.
944.
With the goal of improvement of intramedullary osteosynthesis efficiency in treatment of composite and associated fractures of long bones by way of improvement of fixatives according to their electrical properties and optimization of reparative electrogenesis conditions in 72 experiments with animals the effect of electro-conductive properties and electrostatic field of intra-bone implanted rods on the osteo-reparation following transverse osteotomy has been studied, the method has been elaborated and on the basis of dynamic analysis of 147 clinical observations has been given comparative evaluation of the results of polytetrafluorethylene intramedullary osteosynthesis. The advantages ethylene-based electrets application in case of intramedullary osteosynthesis. The advantages of electret application for activation of osteo-reparation, improvement of the results of treatment and reduction of terms of rehabilitation of victims with critical traumata have been demonstrated. 相似文献
945.
V F Saenko G D Babenkov V I Smorzhevski? S D Gro?sman V A Gubkin S B Virchenko E D Furmanenko A N Bury? 《Klinichna khirurhiia / Ministerstvo okhorony zdorov'ia Ukra?ny, Naukove tovarystvo khirurhiv Ukra?ny》1990,(8):1-5
In the experiment on dogs and in patients with duodenal ulcer disease, it was established that the regulation of acid production besides the vagal nerves was mediated by the intragastric gastrin transport with the blood flow. A method of preoperative diagnosis of the intensity of intragastric blood flow permitting to define more accurately the indications for the choice of a method for surgical treatment has been developed. Supplementation of the selective proximal vagotomy with circular mucosectomy at the boundary between the antrum and body of a stomach enhances the effectiveness of operation due to reduction of the antral gastrin influence on the acid-producing zones of the stomach. 相似文献
946.
V G Elizarov E V Zverev I V Buslov O R Gerasimov 《Ortopediia travmatologiia i protezirovanie》1990,(11):24-29
In the article is presented classification, which takes into consideration mechanisms and sequence of spinal segment destruction in case of compression-flexion violence. On the basis of experimental and clinical data are shown the stages of destruction and their roentgenologic diagnosis, prognostication of some other damages, which are not detected by common methods. Differentiated curative tactics, taking account of necessary restorative measures in correspondence with stages and resolution types, is given. 相似文献
947.
948.
949.
The results of resection of the liver in repeated operations on patients with parasitic disease of the liver are discussed. Operations were conducted on 22 patients with alveococcosis and 7 patients with echinococcosis. By means of the method of atypical liver resection radical operations were performed on 20 patients (69%) and palliative resections of the liver in 9 patients (31%). The palliative resections were combined with cryodestruction of the remaining parasitic tissue, which improved the therapeutic effect significantly and prolonged the patients' survival. The volume of the resection ranged from a segment to one half of the liver. The fatality rate was 6.8%. 相似文献
950.