全文获取类型
收费全文 | 42971篇 |
免费 | 2278篇 |
国内免费 | 160篇 |
专业分类
耳鼻咽喉 | 615篇 |
儿科学 | 1132篇 |
妇产科学 | 862篇 |
基础医学 | 5433篇 |
口腔科学 | 2339篇 |
临床医学 | 3075篇 |
内科学 | 10993篇 |
皮肤病学 | 998篇 |
神经病学 | 3462篇 |
特种医学 | 1195篇 |
外科学 | 6346篇 |
综合类 | 265篇 |
一般理论 | 16篇 |
预防医学 | 3127篇 |
眼科学 | 805篇 |
药学 | 2311篇 |
中国医学 | 156篇 |
肿瘤学 | 2279篇 |
出版年
2023年 | 293篇 |
2022年 | 683篇 |
2021年 | 1519篇 |
2020年 | 807篇 |
2019年 | 1212篇 |
2018年 | 1409篇 |
2017年 | 928篇 |
2016年 | 1024篇 |
2015年 | 1151篇 |
2014年 | 1706篇 |
2013年 | 2072篇 |
2012年 | 3423篇 |
2011年 | 3558篇 |
2010年 | 2021篇 |
2009年 | 1691篇 |
2008年 | 2874篇 |
2007年 | 2885篇 |
2006年 | 2801篇 |
2005年 | 2697篇 |
2004年 | 2331篇 |
2003年 | 2091篇 |
2002年 | 1900篇 |
2001年 | 355篇 |
2000年 | 330篇 |
1999年 | 343篇 |
1998年 | 326篇 |
1997年 | 263篇 |
1996年 | 246篇 |
1995年 | 234篇 |
1994年 | 183篇 |
1993年 | 135篇 |
1992年 | 186篇 |
1991年 | 168篇 |
1990年 | 128篇 |
1989年 | 102篇 |
1988年 | 106篇 |
1987年 | 82篇 |
1986年 | 89篇 |
1985年 | 88篇 |
1984年 | 76篇 |
1983年 | 71篇 |
1982年 | 55篇 |
1981年 | 56篇 |
1980年 | 70篇 |
1979年 | 48篇 |
1978年 | 43篇 |
1977年 | 57篇 |
1976年 | 39篇 |
1974年 | 39篇 |
1973年 | 43篇 |
排序方式: 共有10000条查询结果,搜索用时 1 毫秒
11.
Teresa Nunes José Paulo Monteiro José Carlos Ferreira Pedro Vilela 《European radiology》2009,19(10):2551-2554
L1 disease is the most common genetic cause of congenital hydrocephalus. Mutations in the L1CAM gene are associated with an overlapping clinical spectrum of four X-linked neurological conditions, characterized by hydrocephalus, mental retardation, lower limb spasticity and adducted thumbs. Brain anomalies are frequently present in L1 disease. We describe these anomalies by reporting a case of a male newborn presenting with congenital hydrocephalus along with corpus callosum agenesis and enlargement of the massa intermedia. These findings, in association with the presence of clasped thumbs, raised the suspicion of L1 disease, which was confirmed by the detection of a mutation in the L1CAM gene. In cases of congenital hydrocephalus, recognition of the brain anomalies associated with L1 disease may contribute to pursuing the genetic analysis needed for the diagnosis and genetic counseling. 相似文献
12.
13.
Carlos Alberto Herrero de Morais Norberti Bernardineli Roberto B Garcia Marco A H Duarte Danilo M Z Guerisoli 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2006,102(3):417-421
OBJECTIVE: The aim of this study was to evaluate the biocompatibility of Portland cement with the addition of iodoform, compared to MTA (ProRoot). STUDY DESIGN: Eighteen Wistar albino rats were divided into 3 groups of 6 animals each. Polyethylene tubes were filled either with freshly mixed MTA or Portland cement mixed with iodoform (20% wt/wt) and implanted subcutaneously. An empty tube served as control. After 7, 30, or 60 days, the implants together with the surrounding tissues were removed in blocks. Sections were evaluated for the presence and thickness of a fibrous capsule, presence of granulation tissue, and the severity of inflammatory response. Data were submitted to nonparametric statistical analysis with individual comparisons between groups at a significance level of P < 0.05. RESULTS: There were no differences between inflammatory responses at 7 and 30 days. After 60 days from surgical removal, there was significantly more tissue reaction to the MTA and Portland cement compared to the control group. CONCLUSION: There were no significant differences regarding inflammatory responses between MTA and Portland cement with iodoform after 7, 30, or 60 days. After 60 days, the fibrous capsule around the Portland cement appeared more organized than tissue surrounding MTA implants. After 60 days, there was still a significantly increased tissue reaction to the 2 cements compared to the empty polyethylene tubes. 相似文献
14.
15.
Alcides José Branco Filho William Kondo Luis Sérgio Nassif Mariana Jorge Garcia Rafael de Almeida Tirapelle Carlos Marcelo Dotti 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2006,10(3):326-331
BACKGROUND: Gastrogastric fistula is a communication between the proximal gastric pouch and the distal gastric remnant, rarely described in the realm of bariatric procedures. The aim of this study was to review the existing literature about this topic and to demonstrate its laparoscopic treatment. METHODS: An extensive literature review found several articles reporting this complication. However, no citation was found describing the steps of the laparoscopic management of this situation. RESULTS: Gastrogastric fistula occurs in up to 6% of Roux-en-Y gastric bypasses. Two theories exist for fistula formation: (1) it is a technical complication derived from the incomplete division of the stomach during the creation of the pouch, and (2) it occurs after a staple-line failure, developing a leak with an abscess, which then drains into the distal stomach forming the fistula. Early symptoms include fever, tachycardia, and abdominal pain. Failure in weight loss is a late clinical sign observed in these patients. Diagnosis is based on radiologic study, upper endoscopy and computed tomography. When identified in the acute postoperative course, laparoscopic treatment is easy. Chronic fistulas are difficult to manage, and the laparoscopic approach is an alternative to open surgery. CONCLUSIONS: Gastrogastric fistula is a possible complication of Roux-en-Y gastric bypass and its laparoscopic treatment is feasible. 相似文献
16.
17.
18.
19.
Carlos Ferrer Albiach Antonio Conde Moreno Marta Rodríguez Cordón Virginia Morillo Macías Ana Bouché Babiloni Inmaculada Beato Tortajada Ángel Sánchez Iglesias Alicia Francés Muñoz 《Clinical & translational oncology》2010,12(1):22-26
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution
of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation
therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring
tumour hypoxia. 相似文献
20.