全文获取类型
收费全文 | 4378篇 |
免费 | 304篇 |
国内免费 | 33篇 |
专业分类
耳鼻咽喉 | 41篇 |
儿科学 | 99篇 |
妇产科学 | 91篇 |
基础医学 | 631篇 |
口腔科学 | 114篇 |
临床医学 | 440篇 |
内科学 | 873篇 |
皮肤病学 | 104篇 |
神经病学 | 297篇 |
特种医学 | 129篇 |
外国民族医学 | 2篇 |
外科学 | 592篇 |
综合类 | 65篇 |
现状与发展 | 1篇 |
预防医学 | 282篇 |
眼科学 | 292篇 |
药学 | 342篇 |
中国医学 | 96篇 |
肿瘤学 | 224篇 |
出版年
2023年 | 42篇 |
2022年 | 111篇 |
2021年 | 194篇 |
2020年 | 148篇 |
2019年 | 187篇 |
2018年 | 227篇 |
2017年 | 155篇 |
2016年 | 217篇 |
2015年 | 175篇 |
2014年 | 241篇 |
2013年 | 295篇 |
2012年 | 485篇 |
2011年 | 405篇 |
2010年 | 240篇 |
2009年 | 150篇 |
2008年 | 238篇 |
2007年 | 261篇 |
2006年 | 207篇 |
2005年 | 156篇 |
2004年 | 116篇 |
2003年 | 92篇 |
2002年 | 92篇 |
2001年 | 12篇 |
2000年 | 9篇 |
1999年 | 13篇 |
1998年 | 21篇 |
1997年 | 9篇 |
1996年 | 12篇 |
1995年 | 12篇 |
1994年 | 11篇 |
1993年 | 14篇 |
1992年 | 9篇 |
1991年 | 17篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 12篇 |
1987年 | 16篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 13篇 |
1974年 | 4篇 |
1973年 | 7篇 |
排序方式: 共有4715条查询结果,搜索用时 15 毫秒
111.
Seyed Hamidreza Monavari Mostafa Salehi vaziri Mohammadali Khalili Mahmoud Shamsi-Shahrabadi Hossein Keyvani Hamidreza Mollaei Mehdi Fazlalipour 《生物医学研究杂志》2013,27(1):56-61
In more than half of infertile men,the cause of their infertility is unknown.Several studies revealed the role of viral infections in male infertility.The aim of the present study was to determine the prevalence of herpes simplex virus-1 (HSV-1) and HSV-2 in semen from asymptomatic infertile male patients,and its association with altered semen parameters.A total of 70 semen samples were collected from infertile men who attended the Research and Clinical Center for Infertility in Yazd,Iran.Semen analysis and diagnostic real-time PCR using specific primers and probes for HSV-1 and HSV-2 DNA were performed.Comparison of semen parameters between virally infected and non-infected samples were performed with independent t-test and Mann-Whitney test.Semen analysis showed that infertile men fell into two groups,the male factor group and the unexplained group.HSV-1 and HSV-2 DNA was detected in 16 (22.9%) and 10 (14.3%) of 70 semen samples,respectively.All HSV-positive samples had abnormal semen parameters (the male factor group).Although HSV infection was not associated with sperm motility and morphological defects,it was correlated with lower sperm count in the seminal fluid.The findings suggest that asymptomatic seminal infection of HSV plays an important role in male infertility by adversely affecting sperm count. 相似文献
112.
Keivan Adinehbeigi Mohammad Hossein Radfar Khatereh Rahmani Mohammad Mirzaei Dehaghi Masoud Sami Zeinab Yadegari 《Comparative clinical pathology》2013,22(3):461-466
A cross-sectional survey was carried out on goats slaughtered at the Kerman abattoir from September 2010 to September 2011 to determine the prevalence of cystic hydatidosis. Postmortem examination, hydatid cyst characterization were conducted. Out of the total of 2,002 animals examined (889 females and 1,113 males), 74 (3.69%) were found harboring one or more hydatid cyst. The result obtained from postmortem examination indicated that a total of 91 visceral organs were found harboring one or more hydatid cysts. The involvement of lung, liver, and muscles was found to be 43.95%, 42.85%, and 13.18% respectively. From the total of 575 cysts counted, 214 (37.21%), 186 (32.34%), 63 (10.95%), and 112 (19.47%) were small, medium, large, and calcified cysts, respectively, and 120 (20.86%) and 343 (59.65%) were fertile and sterile cysts, respectively. Out of the 120 fertile cysts subjected for viability test, 116 (96.66%) were viable. 相似文献
113.
Saeed Hajirezaee Hojatollah Jafaryan Samane Nazeri Khadijeh Shamekhi Ranjbar Hossein Khara Amin Golpour 《Comparative clinical pathology》2013,22(1):101-105
To investigate the role of sex steroids of the seminal fluid on sperm quality, the relationships between sex steroids and milt quality parameters (sperm motility and sperm production) were investigated in the Persian sturgeon. The seminal fluid levels of 17α,20β,21-trihydroxy-4-pregnen-3-one (20βs), and 11-ketotestosterone (11-KT) had positive relationships with sperm motility characteristics (percentage and duration of motility) and sperm density. Also, no relationships were found between other sex steroids including: Testosterone (T), progesterone (P), 17α-hydroxyprogesterone (OHP), and milt quality parameters. The good correlation of 20βs and 11-KT of the seminal fluid with sperm motility and sperm density suggests that these steroids may be important hormones involving in final maturation of the Persian sturgeon spermatozoa. 相似文献
114.
115.
Drighil A Al Jufan M Al Omrane K Al Atta J Al Omrani A Al Fadley F 《Journal of interventional cardiology》2012,25(4):391-394
Background: Patent ductus arteriosus (PDA) is a frequent congenital heart disease. Its transcatheter closure has become the treatment of choice in children and adults. However, the device closure of PDA in children with low weight is still challenging with high rate of complications. The aim of this study was to report further experience with trancatheter closure of PDA using the Amplatzer Duct Occluder(ADO) for children weighing less or equal to 8 kg. Methods: Twenty‐two patients (5 male, 17 female) underwent transcatheter closure of a PDA using ADO at a median age of 10 months (range 4 to 26) and a median weight of 7 kg (range 4.3 to 8). Follow‐up evaluations were performed with Doppler echocardiography at 24h, and at 6 and 12 months. Results: The device was implanted successfully in all patients. The median fluoroscopy time was 17.25 min (range 10 to 29). Within 24h, color Doppler revealed complete closure in 15 patients (68%), the other patients had a small residual shunt. No deaths were associated with the procedure. Two patients had a slight aortic protrusion of the device without coarctation and in one patient the device encroached partially on the left pulmonary artery without significant acceleration on Doppler echocardiography. All patients were discharged home the next day. All patients completed the 6‐month follow‐up with complete closure in 18 patients (81%). At the last evaluation in all patients at any time, there has been documentation of complete PDA closure in 20 (91%) of 22 patients. Conclusion: In patients weighing less or equal to 8 kg, percutaneous closure of PDA using an ADO is a safe and effective procedure. (J Interven Cardiol 2012;25:391–394) 相似文献
116.
117.
118.
119.
120.