全文获取类型
收费全文 | 13798篇 |
免费 | 753篇 |
国内免费 | 352篇 |
专业分类
耳鼻咽喉 | 474篇 |
儿科学 | 625篇 |
妇产科学 | 193篇 |
基础医学 | 1229篇 |
口腔科学 | 1336篇 |
临床医学 | 1112篇 |
内科学 | 1638篇 |
皮肤病学 | 73篇 |
神经病学 | 617篇 |
特种医学 | 715篇 |
外科学 | 3132篇 |
综合类 | 2131篇 |
预防医学 | 524篇 |
眼科学 | 287篇 |
药学 | 488篇 |
10篇 | |
中国医学 | 146篇 |
肿瘤学 | 173篇 |
出版年
2024年 | 48篇 |
2023年 | 234篇 |
2022年 | 364篇 |
2021年 | 462篇 |
2020年 | 464篇 |
2019年 | 321篇 |
2018年 | 384篇 |
2017年 | 427篇 |
2016年 | 405篇 |
2015年 | 422篇 |
2014年 | 887篇 |
2013年 | 849篇 |
2012年 | 719篇 |
2011年 | 864篇 |
2010年 | 778篇 |
2009年 | 719篇 |
2008年 | 714篇 |
2007年 | 778篇 |
2006年 | 670篇 |
2005年 | 670篇 |
2004年 | 559篇 |
2003年 | 384篇 |
2002年 | 359篇 |
2001年 | 290篇 |
2000年 | 246篇 |
1999年 | 239篇 |
1998年 | 218篇 |
1997年 | 198篇 |
1996年 | 157篇 |
1995年 | 156篇 |
1994年 | 119篇 |
1993年 | 106篇 |
1992年 | 95篇 |
1991年 | 70篇 |
1990年 | 60篇 |
1989年 | 41篇 |
1988年 | 46篇 |
1987年 | 45篇 |
1986年 | 41篇 |
1985年 | 52篇 |
1984年 | 36篇 |
1983年 | 22篇 |
1982年 | 48篇 |
1981年 | 29篇 |
1980年 | 27篇 |
1979年 | 24篇 |
1978年 | 15篇 |
1976年 | 14篇 |
1974年 | 6篇 |
1968年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
①目的 探讨视神经动脉起源、数目、分布及相关动脉的病理变化,为视神经因缺血所致视野缺损提供形态学依据。②方法 在体视显微镜扣手术显微镜下对100侧成人脑标本观察视神经动脉来源、数目和分布,对其中年龄50-70岁60侧脑标本的视神经和相关动脉进行病理切片观察。③结果 视神经动脉主要来源于颈内动脉、大脑前动脉争前交通动脉。其中单来源3侧(3%),双来源68侧(68%),3来源29侧(29%)。病理切片观察动脉管壁有粥样硬化改变53侧(88.3%),其中被硬化斑块阻塞眼动脉的3侧(5、7%)。阻塞垂体上动脉的4侧(7.5%),小动脉管腔狭窄11侧(20.8%)。与小动脉阻塞相对应的视神经切片。可见有神经纤维萎缩、变性等病理改变。硬化的颈内动脉壁压迫视神经可以形成明显的压迹。④结论 50岁以上出现不明原因的周边或中央视野缺损。脑动脉硬化导致视神经供血障碍病因不能除外。 相似文献
62.
63.
Cyst-like lesions in the radius and tibia were observed in two children as a post-fracture event. The pathogenesis of these lesions is discussed. Cut sections from anatomic specimens display extensive hemorrhage in subperiosteal as well as endosteal and trabecular bone. Cysts arising from hemorrhagic resorption in various locales may explain the occasional atypical appearance of these lesions. 相似文献
64.
65.
66.
Cranial sutures and craniometric points detected on MRI 总被引:2,自引:0,他引:2
Cotton F Rozzi FR Vallee B Pachai C Hermier M Guihard-Costa AM Froment JC 《Surgical and radiologic anatomy : SRA》2005,27(1):64-70
The main goal of the study was to determine on MRI the cranial sutures, the craniometric points and craniometric measurements, and to correlate these results with classical anthropometric measurements. For this purpose, we reviewed 150 cerebral MRI examinations considered as normal (Caucasian population aged 2049 years). For each examination we individualized 11 craniometric landmarks (Glabella, Bregma, Lambda, Opisthocranion, Opisthion, Basion, Inion, Porion, Infra-orbital, Eurion) and three measurements. Measurements were also calculated independently on 498 dry crania (Microscribe 3-DX digitizer). To validate the MRI procedure, we measured four dry crania by MRI and with compass or digital caliper gauges. Cranial sutures always appeared without signal (black), whatever the MRI sequence used, and they are better visualized with a 5 mm slice thickness (compact bone overlapping). Slice dynamic analysis and multiplanar reformatting allowed the detection of all craniometric points, some of these being more difficult to detect than others (Porion, Infra-orbital). The measurements determined by these points were as follows: VertexBasion height=135.66±6.56 mm; EurionEurion width=141.17±5.19 mm; GlabellaOpisthocranion length=181.94±6.40 mm. On the midline T1-weighted sagittal image, all median craniometric landmarks can be individualized and the GlabellaOpisthocranion length, VertexBasion height and parenchyma indices can be calculated. Craniometric points and measurements between these points can be estimated with a standard cerebral MRI examination, with results that are similar to anthropometric data. 相似文献
67.
Moshe Frydman Rachel Straussberg Ruth Shomrat Hans Goebel Cyril Legum Yossi Shiloh 《American journal of medical genetics. Part A》1995,58(3):209-212
A 7-month-old boy with gross motor delay and failure to thrive presented with rhabdomyolysis following an acute asthmatic episode. During hospitalization an electrocardiographic conversion to a Wolff-Parkinson-White type 1 (WPW) pattern took place. Duchenne muscular dystrophy (DMD) was suspected based on elevated creatine kinase (CK) serum levels, muscle biopsy, and family history. The diagnosis was confirmed by molecular analysis, which documented a deletion corresponding to cDNA probe 1-2a in the dystrophin gene, in the propositus and in an affected male cousin of his mother. “Idiopathic” hyperCKemia was found in the propositus, his father, and 5 of his relatives. We suggest that the unusually early and severe manifestations of DMD in this patient may be related to the coincidental inheritance of the maternal DMD gene and of a paternal gene, causing hyperCKemia. © 1995 Wiley-Liss, Inc. 相似文献
68.
远端蒂腓肠神经营养血管皮瓣与肌皮瓣的临床应用与改进 总被引:6,自引:0,他引:6
目的:报道应用远端蒂腓肠神经营养血管皮瓣,肌皮瓣修复小腿下段及足踝部软组织缺损的可行性安全性和临床效果。方法:对42例以远端蒂腓肠神经营养血管(肌)皮瓣修复小腿下段及足踝部不同原因所致软组织缺损病例进行总结分析。本组男36例,女6例;年龄最大75岁、最小6岁;皮瓣最大面积17.0cm×15.0cm,最小6.0cm×5.0cm,其中12例皮瓣面积在10.0cm×10.0cm以上;6例设计为肌皮瓣(腓肠肌外侧头),肌瓣最大为10.0cm×7.0cm×2.0cm,最小为6.0cm×5.0cm×1.0cm。结果:所有病例术后皆出现不同程度的皮瓣肿胀,暗道较明道者明显。2例大皮瓣经行小隐静脉远端结扎仍出现肿胀、色暗,皮瓣近侧1/3坏死。皮瓣边缘坏死3例,换药治愈。部分坏死需行植皮者3例。36例术后伤口I期愈合,骨外露软件组织缺损覆盖修复满意,6例II期愈合,其中糖尿病,地中海贫血各一例。结论:(1)远端蒂腓肠神经营养血管皮瓣转位修复小腿下1/3及足踝部缺损创面,极有临床实用价值;(2)设计切取腓肠神经营养血管肌皮瓣修复小腿及足踝填充感染创腔是可行的;(3)但对其皮瓣及所携带的肌瓣究竟切取多大面积是安全的、肌瓣的血运机理以及远端蒂筋膜皮瓣中小隐静脉干是否结扎,何处结扎等问题仍有待进一步研究。 相似文献
69.
Robert E. Nickel De-Ann M. Pillers Mark Merkens R. Ellen Magenis Deborah A. Driscoll Beverly S. Emanuel Jonathan Zonana 《American journal of medical genetics. Part A》1994,52(4):445-449
Approximately 5% of children with neural tube defects (NTDs) have a congenital heart defect and/or cleft lip and palate. The cause of isolated meningomyelocele, congenital heart defects, or cleft lip and palate has been largely thought to be multifactorial. However, chromosomal, teratogenic, and single gene causes of combinations of NTDs with congenital heart defects and/or cleft lip and palate have been reported. We report on 3 patients with meningomyelocele, congenital heart defects, and 22q11 deletions. Two of the children had the clinical diagnosis of velo-cardio-facial syndrome (VCFS); both also have bifid uvula. The third child had DiGeorge sequence (DGS). The association of NTDs with 22q11 deletions has not been reported previously. An accurate diagnosis of the 22q11 deletions is critical as this micro-deletion and its associated clinical problems is transmitted as an autosomal dominant trait due to the inheritance of the deletion-bearing chromosome. We recommend that all children with NTDs and congenital heart defects, with or without cleft palate, have cytogenetic and molecular studies performed to detect 22q11 deletions. © 1994 Wiley-Liss, Inc. 相似文献
70.
Schwärzler P Zech H Auer M Pfau K Göbel G Vanderzwalmen P Zech N 《Human reproduction (Oxford, England)》2004,19(9):2097-2102
BACKGROUND: Retrospective cohort study to evaluate differences in outcome when embryo transfer was performed either on day 2-3 (cleavage stage, CS-group) or on day 4-5 (blastocyst stage, BS-group). METHODS: A total of 1259 consecutive cycles yielding 500 live born babies performed at a single centre in Bregenz, Austria, were included. Main outcome measures were implantation and (multiple) pregnancy rates and neonatal outcome including birth defects. RESULTS: Total Pregnancy rate was 44% vs 28% (P < 0.001) and the total 'take home baby rate' was 37% vs 22% in the BS-group and the CS-group, respectively. Rate of multiple gestations (34% vs 17%, P = 0.001) was significantly higher among the BS-group, resulting in a higher rate of preterm deliveries < 36 weeks (26% vs 17%, P = 0.045). Female factor causing infertility (40% vs 21%, P < 0.001) was significantly higher among the BS-group. For the CS-group, rate of singleton pregnancies (83% vs 66%, P = 0.001) and idiopathic cause of infertility (34% vs 22%, P = 0.012) were significantly higher. No statistically significant differences were found in sex, Caesarean section rate, Apgar score and umbilical artery pH-values, total mean birth weight, admission rate to intensive care unit, days of hospitalization and number of minor and major birth defects. CONCLUSIONS: Our data suggest that blastocyst transfer may lead to a higher pregnancy rate with an overall better take-home baby rate (THBR) at the cost of higher rates of multiples and preterm deliveries. 相似文献