全文获取类型
收费全文 | 12681篇 |
免费 | 687篇 |
国内免费 | 102篇 |
专业分类
耳鼻咽喉 | 215篇 |
儿科学 | 296篇 |
妇产科学 | 191篇 |
基础医学 | 1632篇 |
口腔科学 | 399篇 |
临床医学 | 801篇 |
内科学 | 3174篇 |
皮肤病学 | 226篇 |
神经病学 | 803篇 |
特种医学 | 385篇 |
外科学 | 2233篇 |
综合类 | 46篇 |
预防医学 | 361篇 |
眼科学 | 279篇 |
药学 | 893篇 |
中国医学 | 60篇 |
肿瘤学 | 1476篇 |
出版年
2023年 | 70篇 |
2022年 | 111篇 |
2021年 | 286篇 |
2020年 | 136篇 |
2019年 | 194篇 |
2018年 | 234篇 |
2017年 | 216篇 |
2016年 | 236篇 |
2015年 | 259篇 |
2014年 | 326篇 |
2013年 | 404篇 |
2012年 | 658篇 |
2011年 | 688篇 |
2010年 | 355篇 |
2009年 | 360篇 |
2008年 | 575篇 |
2007年 | 662篇 |
2006年 | 638篇 |
2005年 | 685篇 |
2004年 | 636篇 |
2003年 | 589篇 |
2002年 | 610篇 |
2001年 | 388篇 |
2000年 | 428篇 |
1999年 | 385篇 |
1998年 | 164篇 |
1997年 | 130篇 |
1996年 | 131篇 |
1995年 | 94篇 |
1994年 | 88篇 |
1993年 | 69篇 |
1992年 | 284篇 |
1991年 | 215篇 |
1990年 | 211篇 |
1989年 | 196篇 |
1988年 | 199篇 |
1987年 | 190篇 |
1986年 | 191篇 |
1985年 | 164篇 |
1984年 | 115篇 |
1983年 | 98篇 |
1981年 | 41篇 |
1979年 | 86篇 |
1978年 | 58篇 |
1977年 | 44篇 |
1974年 | 63篇 |
1973年 | 43篇 |
1972年 | 49篇 |
1970年 | 45篇 |
1969年 | 59篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Chie Teramoto PHN RN MS Satoko Nagata PhD PHN RN Reiko Okamoto PhD PHN RN Ruriko Suzuki PHN RN MS Emiko Kishi PhD PHN RN Michie Nomura DSN PHN RN Noriko Jojima PHN RN MS Masumi Nishida PhD PHN RN Keiko Koide PhD PHN RN Emiko Kusano PhD PHN RN Saori Iwamoto PhD PHN RN Sachiyo Murashima PhD PHN RN 《Public health nursing (Boston, Mass.)》2015,32(6):654-661
2.
3.
4.
5.
6.
Shigeko Tanaka Minoru Yoshiyama Yukihiro Imanishi Koichi Nakahira Takashi Hanaki Yukari Naito Mizue Imai Masahiro Tanaka 《Magnetic resonance in medical sciences》2006,5(4):207-210
One diagnostic criterion for metabolic syndrome is obesity from the accumulation of visceral fat; others include abdominal circumference and area of visceral fat as measured by computed tomography (CT) at the umbilical level. We evaluated visceral fat using frequency-selective excitation magnetic resonance (MR) imaging SPAIR (spectral attenuation with inversion recovery) water suppression THRIVE (3D T1-high resolution isotropic volume examination). Fifty of 70 slices with 2-mm interval were used to render and measure volume of visceral fat ranging within 10 cm of the umbilicus; the area of visceral fat at the umbilical level was also measured. Imaging was completed using breath hold within 14 s. Image processing was easier than using CT. 相似文献
7.
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
8.
Biological activity of partially purified digitalis-like substance and Na-K-ATPase inhibitor in rats
T Morise S Okamoto H Takasaki M Ikeda R Takeda F Kiuti Y Tuda 《Japanese circulation journal》1988,52(11):1309-1316
In order to study the biological activity of endogenous digitalis-like substance (DLS) and Na-K-ATPase inhibitor (ATPI), human urine was partially purified and administered to rats, and its effects on the urinary volume, urinary Na excretion and blood pressure (BP) were determined. In addition, the effect on myocardial Na-K-ATPase activity was also measured. After the extraction of 40L of urine with a reversed phase cartridge column (S-fraction), 20 ml of chloroform was added and extraction was repeated. The chloroform layer was applied to an open silica gel column, and at a fraction with ethylacetate: methanol (60: 40, T-1 fraction), DLS and ATPI were eluted at the highest concentration. The water layer was treated with charcoal (D-1 fraction). The acute administration of K-1, T-1 fraction to rats in vivo caused significant rises in urinary volume, urinary Na excretion and BP. In chronic administration of K-1 fraction, urinary Na excretion was significantly elevated and myocardial Na-K-ATPase activity was also significantly suppressed. These results suggest that DLS and ATPI cause increase in the urinary volume and urinary Na excretion and also possess a hypertensive action; and moreover, these substance may affect the heart like cardiotonic steroids and regulate BP by increasing cardiac contractility. 相似文献
9.
10.
Stimulation of the vagal trunk in cats anesthetized with pentobarbital sodium produced a contractile response of the stomach during stimulation (initial contraction). Pretreatment with either hexamethonium (0.3 to 30 mg/kg, i.v.) or gallamine (1 to 100 mg/kg, i.v.) dose-dependently produced a delayed contraction, following the initial contraction after stimulation. After the administration of either hexamethonium or gallamine produced a maximum delayed contraction, then an additional dose of gallamine or hexamethonium was administered. The subsequent treatment further augmented the delayed contraction. The results indicate that gallamine induced the delayed contraction by a mechanism different from hexamethonium. 相似文献