全文获取类型
收费全文 | 18756篇 |
免费 | 1127篇 |
国内免费 | 140篇 |
专业分类
耳鼻咽喉 | 158篇 |
儿科学 | 418篇 |
妇产科学 | 353篇 |
基础医学 | 2165篇 |
口腔科学 | 733篇 |
临床医学 | 1808篇 |
内科学 | 4052篇 |
皮肤病学 | 392篇 |
神经病学 | 1162篇 |
特种医学 | 425篇 |
外国民族医学 | 5篇 |
外科学 | 2442篇 |
综合类 | 483篇 |
一般理论 | 14篇 |
预防医学 | 1554篇 |
眼科学 | 739篇 |
药学 | 1797篇 |
中国医学 | 232篇 |
肿瘤学 | 1091篇 |
出版年
2024年 | 30篇 |
2023年 | 256篇 |
2022年 | 697篇 |
2021年 | 1079篇 |
2020年 | 711篇 |
2019年 | 862篇 |
2018年 | 1026篇 |
2017年 | 719篇 |
2016年 | 779篇 |
2015年 | 789篇 |
2014年 | 1053篇 |
2013年 | 1218篇 |
2012年 | 1651篇 |
2011年 | 1699篇 |
2010年 | 999篇 |
2009年 | 762篇 |
2008年 | 1108篇 |
2007年 | 984篇 |
2006年 | 828篇 |
2005年 | 704篇 |
2004年 | 554篇 |
2003年 | 454篇 |
2002年 | 389篇 |
2001年 | 48篇 |
2000年 | 58篇 |
1999年 | 58篇 |
1998年 | 50篇 |
1997年 | 44篇 |
1996年 | 43篇 |
1995年 | 35篇 |
1994年 | 18篇 |
1993年 | 33篇 |
1992年 | 24篇 |
1991年 | 17篇 |
1990年 | 19篇 |
1989年 | 20篇 |
1988年 | 17篇 |
1987年 | 10篇 |
1986年 | 13篇 |
1985年 | 12篇 |
1984年 | 19篇 |
1983年 | 17篇 |
1982年 | 16篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1976年 | 10篇 |
1974年 | 8篇 |
1973年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Background/aims: In this series of patients we aim to describe aspects of presentation, diagnosis and management of patients suffering from Echinococcosis in an endemic region. Methods: This is an observational study done at Riyadh Medical Complex, Saudi Arabia from 1999 to 2004. All adult patients admitted with the primary or incidental diagnosis of echinococcosis were included. These patients were followed up for 6 months. Data relating to patients' demographic characteristics, mode and duration of presentation, investigations, complications and treatment offered was collected. This data was then analyzed using SPSS 11.0. Result: 117 patients with a mean age of 40.9+/-20.7 years were admitted, male to female ratio being 1.7:1. 114 (97.4%) originated from Middle East which is an endemic area. Pain right upper quadrant (RUQ), followed by cough were the commonest symptoms. Nine patients presented with jaundice +/- choleangitis: 3 patients had intrabiliary rupture of the hydatid cyst, while 6 had extrinsic compression. Six patients had infected cyst. Fourteen patients had intrabronchial rupture diagnosed on bronchoscopy. Twenty five (21.4%) patients presented with recurrent disease. The Haemagglutination Inhibition test gave a sensitivity of 78.6. All cysts were visualized using USG, CXR and CT scan. Endocystectomy was the most frequent procedure. Post op 8 patients had biliary leakage and 3 had bronchopleural fistula a majority of whom settled conservatively while two required ERCP and one patient with bronchopleural fistula required surgery. Fifteen patients had infection related complications. During our follow up period no recurrences were recorded. All patients undergoing surgery also received medical treatment. Twenty five patients (21.4%) were unable to undergo operative treatment due to multiple reasons. They were medically treated. Conclusion: Cystic Echinococcosis is a disease of the middle aged. Ultrasonogram combined with a serological assay is the best diagnostic tool available for abdominal echinococcosis allowing diagnosis and staging, while chest X ray is the best screen for the pulmonary disease. The recommended treatment is endocystectomy with antihelmenthic therapy. But the problem of early detection of echinococcosis in endemic areas needs attention by workers as this approach can potentially prevent the devastating complications due to this disease. 相似文献
32.
Omidvari Shapour MD Nezakatgoo Nosrat MD † Ahmadloo Niloofar MD Mohammadianpanah Mohammad MD Mosalaei Ahmad MD 《Dermatologic surgery》2005,31(5):499-501
BACKGROUND: Hemangioma is the most common tumor of infancy. Although it has a basically benign nature and usually spontaneously regresses, a small percentage (5%) have complications that need treatment. Many different therapeutic modalities can be used in this tumor. OBJECTIVE: To investigate the effect of a new method of treatment (intralesional bleomycin injection) in complicated hemangiomas. MATERIALS AND METHODS: In the Department of Radiation Oncology at Nemazee Hospital in Shiraz, Iran, from April 1992 to October 1998, 32 patients with complicated hemangioma were treated with four to six courses of direct injection of bleomycin into the lesion. RESULTS: After a minimum follow-up of 6 years, there was 70 to 100% regression in 18 patients, 50 to 70% in 7 cases, and less than 50% reduction in 7 patients. CONCLUSION: Intralesional injection of bleomycin is an easy, safe, and effective therapeutic modality in complicated cutaneous hemangiomas. 相似文献
33.
34.
A. J. Pijl K. A. Solen† S. F. Mohammad R. Monson† L. S. Yu J. M. T. van Griensven D. B. Olsen W. J. Kolff 《Artificial organs》1990,14(2):125-129
Device-induced thrombogenesis was studied in an in vitro model using human blood circulated through an artificial ventricle. A new constant pressure filtration technique was used to detect circulating microemboli, the activated partial thromboplastin time (APTT) test was used to monitor the blood for the presence of anticoagulant activity of heparin, and hemolysis was quantified by measuring the plasma free hemoglobin level. Circulation of blood through a 20-ml stroke volume pneumatically driven ventricle for 6-9 h resulted in a significant reduction of APTT, indicating the loss of the anticoagulant effect of heparin. Microemboli concentration was minimal until the APTT decreased below 125 s, at which time the microemboli concentration increased rapidly. This was presumed to be due to the formation of thrombi following a decrease in heparin activity. A significant increase in hemolysis was also noted when blood was pumped. None of these changes was noted in the nonpumped control blood. Spontaneous loss of heparin activity in blood circulated by a pneumatically driven pump may have clinical implications and may help understanding of the problems associated with device-induced thrombogenesis. 相似文献
35.
36.
37.
38.
Mohammad Nasri-Sebdani Flavien Traoré Christian Cognard Daniel Potreau Jean -Pierre Poindessault Guy Raymond 《Pflügers Archiv : European journal of physiology》1990,416(1-2):106-112
The effects of tetracaine (10–50 M) and ryanodine (0.1–10 M) were tested on the slow outward K+ current (I
so) and the mechanical tension of isolated frog muscle fibres in a voltage-clamp device (double mannitol-gap) connected to a mechanoelectric transducer. In the concentration range tested, both drugs induced a simultaneous inhibition of tension and current. In all cases the effect on tension was twice that on current. The tetracaine-induced current and tension blocks were fully reversible and dose-dependent. In contrast the ryanodine effects on current and tension were not reversible and did not exhibit a dose dependence except for the delay before the onset of the response, which was shortened when the concentration was raised. Linear regression analysis of the time-dependent and dose-dependent effects of both drugs indicated a strong correlation between the decreases in tension and current. It is concluded that the slow outward current is partly under the control of the Ca2+ release from sarcoplasmic reticulum during contraction. 相似文献
39.
Mohammad Hassanzadeh Hassan Gilanpour Saied Charkhkar Johan Buyse Eddy Decuypere 《Avian pathology》2005,34(3):188-193
The present study was designed to compare the anatomical parameters of the cardiopulmonary system in three different lines of chickens with different susceptibility to ascites syndrome. Eggs from three different genetic lines-commercial broiler and layer lines and one native to Iran--were incubated and hatched, and 1-day-old chicks used. The relative heart and lung weights, the volumes of the heart, lung and thorax cavity, the incidence of ascites, and the related physiological parameters in these chickens were followed. Lung weight as a percentage of body weight, the relative lung and heart volume, and the volumes of the thorax cavity, before and after removing heart and lung tissues, were lower in fast-growing broiler chickens compared with the layer and native chickens. Additionally, most of these parameters (e.g. relative lung weight, lung volume and thorax cavity) were significantly decreased with age in broiler chickens but were increased in layer and native chickens, which was concomitant with the incidence of ascites in broiler chickens. Our data indicate that all cardiopulmonary parameters investigated are extremely unfavourable to broiler chickens and suggest a reduction in gas exchange area in broilers, and therefore higher susceptibility to pulmonary hypertension and ascites. 相似文献
40.
Ryoichi?Inaba Seyed?Mohammad?Mirbod Haruo?SugiuraEmail author 《BMC complementary and alternative medicine》2005,5(1):8