全文获取类型
收费全文 | 3004篇 |
免费 | 156篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 22篇 |
儿科学 | 508篇 |
妇产科学 | 43篇 |
基础医学 | 289篇 |
口腔科学 | 31篇 |
临床医学 | 208篇 |
内科学 | 598篇 |
皮肤病学 | 72篇 |
神经病学 | 118篇 |
特种医学 | 180篇 |
外科学 | 456篇 |
综合类 | 156篇 |
预防医学 | 108篇 |
眼科学 | 46篇 |
药学 | 150篇 |
中国医学 | 7篇 |
肿瘤学 | 191篇 |
出版年
2023年 | 18篇 |
2022年 | 18篇 |
2021年 | 45篇 |
2020年 | 25篇 |
2019年 | 40篇 |
2018年 | 73篇 |
2017年 | 38篇 |
2016年 | 74篇 |
2015年 | 61篇 |
2014年 | 98篇 |
2013年 | 109篇 |
2012年 | 185篇 |
2011年 | 157篇 |
2010年 | 136篇 |
2009年 | 96篇 |
2008年 | 154篇 |
2007年 | 142篇 |
2006年 | 117篇 |
2005年 | 106篇 |
2004年 | 84篇 |
2003年 | 110篇 |
2002年 | 103篇 |
2001年 | 96篇 |
2000年 | 85篇 |
1999年 | 77篇 |
1998年 | 75篇 |
1997年 | 55篇 |
1996年 | 50篇 |
1995年 | 34篇 |
1994年 | 48篇 |
1993年 | 31篇 |
1992年 | 53篇 |
1991年 | 58篇 |
1990年 | 37篇 |
1989年 | 41篇 |
1988年 | 38篇 |
1987年 | 53篇 |
1986年 | 36篇 |
1985年 | 42篇 |
1984年 | 23篇 |
1983年 | 20篇 |
1982年 | 21篇 |
1981年 | 26篇 |
1980年 | 13篇 |
1979年 | 16篇 |
1978年 | 24篇 |
1977年 | 29篇 |
1976年 | 34篇 |
1975年 | 15篇 |
1974年 | 11篇 |
排序方式: 共有3183条查询结果,搜索用时 15 毫秒
1.
2.
Akira Sawaki Nobumasa Mizuno Kuniyuki Takahashi Tsuneya Nakamura Masahiro Tajika Hiroki Kawai Toshifumi Isaka Hiroshi Imaoka Yasuyuki Okamoto Masatoshi Aoki Hiroyuki Inoue Ahmed AS Salem Yasushi Yatabe Kenji Yamao 《Digestive endoscopy》2006,18(1):40-44
Background: Gastrointestinal stromal tumors (GIST) are one of the most common mesenchymal tumors of the gastrointestinal tract. GIST are defined by positive immunohistochemical staining for KIT or CD34 and thus are generally diagnosed after surgery. Because small GIST are rarely diagnosed before surgery, the clinical course of these small tumors is not clear. The aim of the present study was to follow changes in size and configuration of small GIST that were pathologically confirmed using endoscopic ultrasonography‐guided fine‐needle aspiration biopsy (EUS‐FNAB). Methods: Between July 1997 and December 2003, 16 tumors in 16 patients (10 men and 6 women) with an immunohistochemical diagnosis of GIST were regularly followed in our hospital. The median patient age when EUS‐FNAB was performed was 62 years (range 26–82 years) and the median follow‐up period was 4.9 years (range 0.5–9.6 years). Results: Fourteen tumors showed no remarkable changes in size and shape during follow up compared with the initial diagnosis. Two tumors enlarged: one tumor approximately doubled its diameter in 8 years and the other tumor increased from 1.8 cm at diagnosis to up to 10 cm after only 2 years. Doubling time of the latter tumor was calculated as 3.1 months. Conclusions: We conclude that EUS‐FNAB might be a good modality for final diagnosis of GIST without surgery, and that GIST without rapid growth on follow up can be endoscopically followed. 相似文献
3.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
4.
5.
Semen analysis was performed on 48 men who had undergone orchiopexy, 40 for unilateral impalpable testes and 8 for bilateral impalpable testes. Patients with unilateral impalpable testes had varying sperm analysis; 18 (86%) of the 23 patients with unilateral impalpable canalicular testes had normal sperm analysis. All patients with bilateral impalpable testes were azoospermic. The subsequent quality of the semen is dependent upon the original anatomical positions of the undescended testes. 相似文献
6.
7.
Malignant schwannoma (malignant peripheral nerve sheath tumour, MPNST) is a rare high-grade tumour arising from peripheral nerves. We report the case of a 3-year-old male who presented with a non-tender lesion on the dorsum of his penis. The lesion was excised and a formal circumcision performed. Histology of the lesion revealed a spindle cell tumour. Immunohistochemistry showed the tumour cells to be strongly positive for S100 and Vimentin. A diagnosis of intermediate grade malignant peripheral nerve sheath tumour was made. Malignant schwannoma is rare in children and is previously unreported in the penis in the paediatric age group without evidence of neurofibromatosis. 相似文献
8.
9.
Dhawan Subhash; Puri Raj K.; Kumar Ashok; Duplan Helen; Masson Jean-Michel; Aggarwal Bharat B. 《Blood》1997,90(4):1535-1544
10.
In most Special Care Neonatal Units (SCNUs) in India, mothers are excluded from the care of their sick babies for fear of over-crowding and dislocation. We have attempted to study the feasibility of involving mothers in the care of their babies admitted for neonatal septicemia and to analyse whether this changed the sepsis related case fatality rate. The study material consisted of 158 neonates with blood culture positive neonatal septicemia whose mothers were actively involved in their care during their stay in the SCNU of LNJPN Hospital throughout 1987-88. The mothers lived in with their sick neonates and were extremely useful in feeding, cleaning, and monitoring for some important signs and symptoms. There were no epidemics of infection in the nursery during this period. All the babies discharged were receiving breast feeds, and the mothers were confident in taking care of them before discharge. The mortality in this group was 43%. The onset of septicemia was most often in the first week (36%) being 25.9% in second week, 26.6% in the third, and 11.4% in the fourth. Mortality was maximum (64.5%) when the onset of illness was in the first 3 days. Klebsiella and S. aureus were commonly isolated organisms (38.6 and 21.5%, respectively). Gram negative organisms were isolated in 66.5% cases with higher mortality in this group. Nearly 46% of the babies weighed 2 kg or less, with a mortality of 60.2% compared to 28.2% in those more than 2 kg. Only 3 to 5% and 40 to 66.7% of Gram negative and 23 and 70% of Gram positive organisms were sensitive to ampicillin and gentamicin, respectively. 相似文献