全文获取类型
收费全文 | 8421篇 |
免费 | 463篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 177篇 |
儿科学 | 452篇 |
妇产科学 | 162篇 |
基础医学 | 759篇 |
口腔科学 | 139篇 |
临床医学 | 584篇 |
内科学 | 1581篇 |
皮肤病学 | 142篇 |
神经病学 | 538篇 |
特种医学 | 245篇 |
外科学 | 1602篇 |
综合类 | 309篇 |
预防医学 | 419篇 |
眼科学 | 333篇 |
药学 | 653篇 |
中国医学 | 26篇 |
肿瘤学 | 790篇 |
出版年
2023年 | 45篇 |
2022年 | 128篇 |
2021年 | 270篇 |
2020年 | 137篇 |
2019年 | 204篇 |
2018年 | 270篇 |
2017年 | 188篇 |
2016年 | 250篇 |
2015年 | 207篇 |
2014年 | 343篇 |
2013年 | 427篇 |
2012年 | 597篇 |
2011年 | 643篇 |
2010年 | 382篇 |
2009年 | 317篇 |
2008年 | 478篇 |
2007年 | 511篇 |
2006年 | 479篇 |
2005年 | 373篇 |
2004年 | 376篇 |
2003年 | 321篇 |
2002年 | 232篇 |
2001年 | 145篇 |
2000年 | 168篇 |
1999年 | 150篇 |
1998年 | 55篇 |
1997年 | 46篇 |
1996年 | 52篇 |
1995年 | 37篇 |
1993年 | 28篇 |
1992年 | 60篇 |
1991年 | 49篇 |
1990年 | 46篇 |
1989年 | 53篇 |
1988年 | 44篇 |
1987年 | 61篇 |
1986年 | 48篇 |
1985年 | 56篇 |
1984年 | 52篇 |
1983年 | 33篇 |
1979年 | 26篇 |
1978年 | 29篇 |
1977年 | 30篇 |
1974年 | 34篇 |
1973年 | 49篇 |
1972年 | 42篇 |
1971年 | 37篇 |
1970年 | 30篇 |
1969年 | 35篇 |
1968年 | 36篇 |
排序方式: 共有8911条查询结果,搜索用时 15 毫秒
21.
Sandeep Nijhawan Mukul Rastogi Ashish Joshi Atul Shende Manish Tandon Dinesh Singla Amit Mathur Subhash Nepalia Ramesh Roop Rai 《Digestive endoscopy》2007,19(2):80-82
Background: Ingestion of coins is a common clinical problem in children. Many of the coins are ferromagnetic and can be retrieved with the help of a magnet. We describe the use of a novel endoscopic accessory for removing ferromagnetic coins. Material and methods: Two magnet discs of 1.5 cm diameter were joined to a 200 cm steel wire of 0.75 mm thickness with a terminal 5 cm spring. A Teflon tube (160 cm, 7 F) was used along with this instrument as a sleeve. The use of this accessory was analyzed prospectively in subjects presenting with a history of coin ingestion. The time taken for removal of coins, complications during the procedure and failure rate was noted. Effect of the magnet on cardiac rhythm was also noted during the procedure. Results: A total of 55 children (mean age 5.1 ± 2.3 years) with coin ingestion presented over a period of 1 year. Forty‐four coins were ferromagnetic. All ferromagnetic coins were removed successfully. Mean time for removal was 68 ± 22 s. No complications were encountered. Conclusion: The novel magnetic instrument is precise, safe and quick for the removal of ferromagnetic coins under direct vision. 相似文献
22.
Manish Gupta Neena Chaudhary A. K. Rai 《Indian journal of otolaryngology and head and neck surgery》2007,59(2):160-162
Teratomas are true neoplasms composed of tissues from all three germinal layers and may exhibit variable levels of maturity. They have an unknown origin and eccentric microscopic appearance. Teratomas arising from the oral cavity are rare in the newborn; only 22 cases have been reported in the literature. We describe a female neonate with an oral teratoma originating from the tongue that was successfully treated with surgery. 相似文献
23.
24.
David S. K. Lu Shantanu Sinha John Lucas Keyvan Farahani Robert Lufkin Klaus Lewin 《Journal of magnetic resonance imaging : JMRI》1997,7(2):303-308
The purpose of this study was to test the feasibility of MR-guided percutaneous ethanol ablation of liver tissue on a .2-T open MR scanner. Needles were placed by MR guidance first into an ex vivo sheep liver and then into livers of three anesthetized pigs, and injection of 10 ml of 96% alcohol was performed. T1 fast low-angle shot (FLASH), T2 turbo spin echo (TSE), and T1 spin echo (SE) images were obtained after incremental volumes of injection. In one pig, simultaneous injection of saline into normal liver was also performed with subsequent pathological correlation. Ethanol-infiltrated liver was hypointense to liver on all sequences, whereas saline caused no tissue signal changes on T1 SE and either isointense or hyperintense changes on T2 TSE images. Pathological examination confirmed ethanol-induced acute liver changes as compared with the control. MR guidance of needle placement and monitoring of ethanol effects on liver tissue is feasible. This may have implications for potential MR-guided hepatic tumor ablation. 相似文献
25.
26.
27.
28.
A steady fall in menarcheal age has been observed in many countries during this century. A study on 894 school girls of different parts of West Bengal was carried out by recollection method to verify whether the decline in menarcheal age is existing in West Bengal or not. Evidence of steady fall of menarcheal age has been confirmed in the present study. 相似文献
29.
Lileswar Kaman Byju Kundel Saroj Kant Sinha Rajinder Singh 《Indian journal of gastroenterology》2003,22(2):65-66
Ephiphrenic esophageal diverticulum is rare and usually is a pulsion-type pseudodiverticulum that occurs in association with motility disorders of the esophagus. We report a 35-year-old man with tubercular lymphadenitis causing true traction type of epiphrenic diverticulum. Esophageal diverticulectomy and esophagomyotomy was done; he is doing well on antitubercular drugs. 相似文献
30.
Restless legs syndrome (RLS) is one of the commonest movement disorders affecting sleep and also daytime functioning. The prevalence may be 8%–10% of the white Caucasian population. The diagnosis is simple and is based on a well-validated clinical questionnaire, yet misdiagnosis is common and the condition remains underdiagnosed and consequently inappropriately treated, often causing great distress to the sufferers. In spite of robust evidence for effective treatment of RLS, patients may often be told to “put up with the symptoms” and suffer the consequence of years of poor sleep which may lead to major lifestyle changes. This review addresses the diagnostic issues, the differential diagnosis, and the evidence base for treatment of the common condition. 相似文献