全文获取类型
收费全文 | 1817篇 |
免费 | 117篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 73篇 |
儿科学 | 55篇 |
妇产科学 | 70篇 |
基础医学 | 177篇 |
口腔科学 | 63篇 |
临床医学 | 168篇 |
内科学 | 308篇 |
皮肤病学 | 32篇 |
神经病学 | 106篇 |
特种医学 | 62篇 |
外科学 | 257篇 |
综合类 | 44篇 |
预防医学 | 139篇 |
眼科学 | 65篇 |
药学 | 192篇 |
中国医学 | 40篇 |
肿瘤学 | 97篇 |
出版年
2024年 | 4篇 |
2023年 | 29篇 |
2022年 | 78篇 |
2021年 | 98篇 |
2020年 | 73篇 |
2019年 | 87篇 |
2018年 | 94篇 |
2017年 | 79篇 |
2016年 | 66篇 |
2015年 | 70篇 |
2014年 | 89篇 |
2013年 | 97篇 |
2012年 | 146篇 |
2011年 | 123篇 |
2010年 | 71篇 |
2009年 | 58篇 |
2008年 | 113篇 |
2007年 | 73篇 |
2006年 | 84篇 |
2005年 | 60篇 |
2004年 | 46篇 |
2003年 | 48篇 |
2002年 | 45篇 |
2001年 | 28篇 |
2000年 | 20篇 |
1999年 | 22篇 |
1998年 | 13篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 15篇 |
1989年 | 10篇 |
1988年 | 11篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1973年 | 1篇 |
1969年 | 2篇 |
1928年 | 1篇 |
排序方式: 共有1948条查询结果,搜索用时 15 毫秒
41.
Efrat Hadi MD Ilan Bruchim MD Ilana Helman MD Itshak Shehtman MD Rodica Stackievicz MD Ronnie Tepper MD Reli Hershkovitz MD 《Journal of clinical ultrasound : JCU》2015,43(1):59-63
Uterine lymphoma is rare and tends to be misdiagnosed due to lack of specific radiologic features. Few reports have been published on the sonographic characteristics of uterine lymphoma. We present a case report of uterine lymphoma manifested by a fast growing uterus and describe the sonographic findings. © 2014 Wiley Periodicals, Inc. J Clin Ultrasound, 43 :59–63, 2015 相似文献
42.
Karimi M Hadi Imanieh M Ghiam AF Hashemi Z 《European journal of gastroenterology & hepatology》2005,17(12):1363-1367
BACKGROUND: Recurrent abdominal pain (RAP) affects many children, especially those affected by beta-thalassaemia major. The role of Helicobacter pylori is still unclear in children with RAP. OBJECTIVES: The aim of the present study was the comparison of beta-thalassaemia major patients and normal controls with RAP in H. pylori infection. The factors influencing H. pylori prevalence were also investigated. METHODS: A series of 50 beta-thalassaemia major cases (30 female, 20 male; aged 6-25 years) and 50 age-matched and sex-matched controls, both presenting with RAP, were recruited during a period of 18 months. The study participants were obtained through a multistage random sampling method among those that met Apley's criteria. All the patients and controls had undergone diagnostic oesophagogastroduodenoscopy with biopsy. H. pylori infection was confirmed by two histopathological examinations on an endoscopy sample and a rapid urease test. RESULTS: H. pylori infection in thalassaemic patients was more common than in controls [34/50 (68%) versus 30/50 (60%)], but this higher frequency was not statistically significant. A clear relationship was found between the prevalence of H. pylori and age, duration of transfusion/chelation programmes, pain duration and splenectomy. In contrast, H. pylori did not correlate with abdominal pain characteristics, blood group, serum ferritin level and pathology of the upper gastrointestinal tract. The most frequent endoscopy abnormality was gastritis (72%). Nausea and heartburn were the leading associated symptoms. CONCLUSION: The high prevalence of H. pylori infection suggests that H. pylori should be remembered as a probable cause of RAP in beta-thalassaemia major patients. 相似文献
43.
44.
45.
Eda Ozcelik Sema Uslu Nilufer Erkasap Hadi Karimi 《The Kaohsiung journal of medical sciences》2014,30(6):286-290
Acetaminophen (APAP) is the most commonly reported toxic ingestion in the world. Severe liver injury resulting from overdose or chronic use of APAP remains a significant clinical problem. In recent years, the mechanisms underlying liver injury caused by APAP have become much better understood. We have studied the protective effect of chitosan supplementation against APAP-induced hepatotoxicity with respect to changes in the levels of total and lipid-bound sialic acid in the serum and in the liver tissue and changes in the activity of diagnostic marker enzymes, lipid peroxidation, and ceruloplasmin oxidase enzyme in normal and experimental groups of rats. During the experimental period, chitosan (200 mg/kg body weight per day) was administered to APAP + chitosan-treated rats by oral gavage. Results showed that treatment with APAP induced a significant increase in the serum alanine aminotransferase and alkaline phosphatase activities, in total and lipid-bound sialic acids levels, and in the liver lipid peroxide content. The administration of chitosan significantly prevented APAP-induced alterations in the levels of diagnostic marker enzymes, total sialic acid, lipid-bound sialic acid, and malondialdehyde in the experimental groups of rats. Furthermore, chitosan administration increased the activity of ceruloplasmin oxidase. In conclusion, our results suggest that chitosan has a protective effect on APAP-induced hepatic injury in rats. The study sheds light on the therapeutic potential of chitosan in an APAP-induced hepatotoxicity model. 相似文献
46.
47.
Noushin Shokouhinejad
DDS MSC Hasan Razmi
DDS MSC Reza Fekrazad
DDS MSC Saeed Asgary
DDS MSC Ammar Neshati
DDS Hadi Assadian
DDS MSC Sanam Kheirieh
DDS 《Australian endodontic journal : the journal of the Australian Society of Endodontology Inc》2012,38(3):113-117
This study compared the push‐out bond strength of mineral trioxide aggregate (MTA) and a new endodontic cement (NEC) as root‐end filling materials in root‐end cavities prepared by ultrasonic technique (US) or Er,Cr:YSGG laser (L). Eighty single‐rooted extracted human teeth were endodontically treated, apicectomised and randomly divided into four following groups (n = 20): US/MTA, US/NEC, L/MTA and L/NEC. In US/MTA and US/NEC groups, root‐end cavities were prepared with ultrasonic retrotip and filled with MTA and NEC, respectively. In L/MTA and L/NEC groups, root‐end cavities were prepared using Er,Cr:YSGG laser and filled with MTA and NEC, respectively. Each root was cut apically to create a 2 mm‐thick root slice for measurement of bond strength using a universal testing machine. Then, all slices were examined to determine the mode of bond failure. Data were analysed using two‐way anova . Root‐end filling materials showed significantly higher bond strength in root‐end cavities prepared using ultrasonic technique (US/MTA and US/NEC) (P < 0.001). The bond strengths of MTA and NEC did not differ significantly. The failure modes were mainly adhesive for MTA, but cohesive for NEC. In conclusion, bond strengths of MTA and NEC to root‐end cavities were comparable and higher in ultrasonically prepared cavities. 相似文献
48.
49.
50.
In inoperable or high-risk patients with severe aortic stenosis, transcatheter aortic valve implantation (TAVI) provides an efficacious and safe alternative to surgical aortic valve replacement. In this case report, TAVI resulted in aortic valve cusp shearing and migration into the left main coronary artery, resulting in occlusion of coronary blood flow and cardiac arrest. The patient underwent immediate cardiopulmonary support and surgical intervention with a favourable outcome. With this case report, we illustrate the etiology and management of this complication, which can be recognized nonsurgically only if a high index of suspicion exists. 相似文献