全文获取类型
收费全文 | 30642篇 |
免费 | 1429篇 |
国内免费 | 163篇 |
专业分类
耳鼻咽喉 | 357篇 |
儿科学 | 607篇 |
妇产科学 | 561篇 |
基础医学 | 3948篇 |
口腔科学 | 854篇 |
临床医学 | 2422篇 |
内科学 | 6717篇 |
皮肤病学 | 739篇 |
神经病学 | 2218篇 |
特种医学 | 1378篇 |
外科学 | 5200篇 |
综合类 | 222篇 |
现状与发展 | 1篇 |
一般理论 | 2篇 |
预防医学 | 1140篇 |
眼科学 | 495篇 |
药学 | 2208篇 |
中国医学 | 175篇 |
肿瘤学 | 2990篇 |
出版年
2023年 | 174篇 |
2022年 | 406篇 |
2021年 | 675篇 |
2020年 | 347篇 |
2019年 | 446篇 |
2018年 | 679篇 |
2017年 | 475篇 |
2016年 | 577篇 |
2015年 | 670篇 |
2014年 | 986篇 |
2013年 | 1061篇 |
2012年 | 1717篇 |
2011年 | 1690篇 |
2010年 | 1048篇 |
2009年 | 878篇 |
2008年 | 1481篇 |
2007年 | 1450篇 |
2006年 | 1454篇 |
2005年 | 1465篇 |
2004年 | 1352篇 |
2003年 | 1229篇 |
2002年 | 1224篇 |
2001年 | 1191篇 |
2000年 | 1167篇 |
1999年 | 1005篇 |
1998年 | 362篇 |
1997年 | 274篇 |
1996年 | 270篇 |
1995年 | 198篇 |
1994年 | 166篇 |
1993年 | 139篇 |
1992年 | 586篇 |
1991年 | 515篇 |
1990年 | 473篇 |
1989年 | 520篇 |
1988年 | 432篇 |
1987年 | 399篇 |
1986年 | 410篇 |
1985年 | 388篇 |
1984年 | 280篇 |
1983年 | 179篇 |
1979年 | 175篇 |
1978年 | 115篇 |
1977年 | 116篇 |
1975年 | 105篇 |
1974年 | 103篇 |
1973年 | 101篇 |
1972年 | 98篇 |
1969年 | 113篇 |
1967年 | 101篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
K Aida M Tawata H Shindo T Onaya H Sasaki T Yamaguchi M Chin H Mitsuhashi 《Planta medica》1990,56(3):254-258
22.
23.
24.
Effects of vancomycin and ofloxacin on rabbit ERG in vivo 总被引:1,自引:0,他引:1
The retinal toxicity of vancomycin and ofloxacin was studied by electroretinogram (ERG) before and after intravitreal injection in rabbits. Vancomycin is known to be effective on methicillin-resistant Staphylococcus aureus. A dose of 1mg vancomycin caused no ERG change for at least eight weeks after injection. The feature that ERG became non-recordable during one to four weeks after an intravitreal injection of 10mg vancomycin, with recovery of only the c-wave was conspicuous. A dose of 200 micrograms ofloxacin did not cause deterioration of the b-wave, the c-wave or the oscillatory potentials throughout the follow-up period up to eight weeks. Judging from the susceptibility of each ERG component to antimicrobials and taking into account the difference of vitreous volume between rabbits and humans, clinical doses of intravitreal single-shot injection should be less than 1mg for vancomycin and 200 micrograms for ofloxacin. 相似文献
25.
J C Shih T L Ko M C Lin M K Shyu C N Lee F J Hsieh 《Ultrasound in obstetrics & gynecology》2004,24(2):202-206
The relationship of large and vascularized chorioangiomas to adverse pregnancy outcome is well recognized. We present a patient with a large placental tumor and signs of impending fetal cardiac failure. The angioarchitecture of the tumor depicted by three-dimensional (3D) power Doppler ultrasound enabled us to accurately diagnose a placental chorioangioma. During the follow-up period, quantitative flow data obtained using 3D power Doppler indicated altered hemodynamics in the tumor and concomitant improvement in the condition of the fetus, enabling us to manage the mother conservatively. Spontaneous delivery occurred at 38 weeks without any complications. This report demonstrates the potential value of 3D power Doppler in prenatal diagnosis and monitoring of pregnancies complicated by large, vascularized chorioangioma. 相似文献
26.
27.
28.
The association of MTHFR and CBS variants with the doubling time and responsiveness to several chemodrugs was analyzed in 26 human cancer xenografts. The tumors homozygous for the absence of insertion (NN) for the CBS 844ins68bp were more chemosensitive than those with insertion (NI) to TS-1 (P=0.0048), suggesting a potential effect of this variant on fluoropyrimidine efficacy. Furthermore, the doubling time of tumors with a variant C allele (AC or CC) in MTHFR-A1298C was significantly longer than that of tumors with a normal allele (AA) (P=0.0008). Twenty-nine cellular proliferation-related genes were associated with MTHFR-A1298C genotyping and with the doubling time. 相似文献
29.
Kunihiro Ichinose Mitsuru Nakamura Kenji Takezawa Ichiro Masutomi Yoichi Shima Yoko Hirayama Kahoko Sorimachi Teruhiko Shimizu Hiroyo Ishikawa Namiko Kaji Sayaka Nakajima Michiko Wataru Shiho Nishigaki Hiroshi Suwa Yosuke Toyama Masaki Okumura Yoshikazu Ishitsuka Ken Shimizu Kazuya Kokubo Kenji Sasaki Shodai Saito 《Seishin shinkeigaku zasshi》2006,108(9):945-954
30.
Kenji Tsukada Shigeru Kobayashi Tatsuya Gotoh Naoki Asakage Masayuki Sekine Morio Sasaki Eiji Miyazaki Takahisa Suzuki Toshio Yamada Shu Hirai Shigetaka Yamazaki 《Digestive endoscopy》2006,18(1):55-58
A case of early gastric carcinoma accompanied by Dieulafoy ulcer is presented. The patient, a 26‐year‐old female, visited our emergency room with chief complaints of massive hematemesis and tarry stool. The initial endoscopic examination revealed a superficial depressed lesion with a faded color accompanied by a tiny ulcer with converging folds at the anterior wall of the middle gastric body. Although no active bleeding vessel was found at that time, the patient was admitted to our hospital for further check‐ups and treatment. On the 6th hospital day, she developed massive hematemesis resulting in shock. Urgent endoscopy, this time, disclosed an exposed bleeding vessel at the small ulcer floor previously mentioned, and endoscopic hemostasis was achieved. Since, however, a biopsy at initial examination from the surrounding depressed area proved carcinoma, a partial distal gastrectomy was subsequently carried out. Histological examination of the resected specimen confirmed the diagnosis of carcinoma limited to the mucosa and submucosa along with findings consistent with Dieulafoy ulcer. This is a rare case of combination of early cancer and Dieulafoy ulcer particularly in such a young patient. A review of the literature is also presented. 相似文献