全文获取类型
收费全文 | 3109篇 |
免费 | 133篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 161篇 |
妇产科学 | 135篇 |
基础医学 | 306篇 |
口腔科学 | 47篇 |
临床医学 | 280篇 |
内科学 | 846篇 |
皮肤病学 | 98篇 |
神经病学 | 200篇 |
特种医学 | 373篇 |
外国民族医学 | 3篇 |
外科学 | 299篇 |
综合类 | 31篇 |
预防医学 | 180篇 |
眼科学 | 25篇 |
药学 | 154篇 |
肿瘤学 | 117篇 |
出版年
2021年 | 36篇 |
2020年 | 18篇 |
2019年 | 37篇 |
2018年 | 50篇 |
2017年 | 23篇 |
2016年 | 36篇 |
2015年 | 32篇 |
2014年 | 60篇 |
2013年 | 75篇 |
2012年 | 92篇 |
2011年 | 93篇 |
2010年 | 89篇 |
2009年 | 86篇 |
2008年 | 97篇 |
2007年 | 175篇 |
2006年 | 106篇 |
2005年 | 123篇 |
2004年 | 103篇 |
2003年 | 99篇 |
2002年 | 89篇 |
2001年 | 101篇 |
2000年 | 94篇 |
1999年 | 104篇 |
1998年 | 87篇 |
1997年 | 90篇 |
1996年 | 65篇 |
1995年 | 76篇 |
1994年 | 56篇 |
1993年 | 44篇 |
1992年 | 85篇 |
1991年 | 67篇 |
1990年 | 67篇 |
1989年 | 76篇 |
1988年 | 70篇 |
1987年 | 72篇 |
1986年 | 73篇 |
1985年 | 96篇 |
1984年 | 51篇 |
1983年 | 40篇 |
1982年 | 40篇 |
1981年 | 27篇 |
1980年 | 32篇 |
1979年 | 30篇 |
1978年 | 30篇 |
1977年 | 38篇 |
1976年 | 25篇 |
1975年 | 17篇 |
1973年 | 16篇 |
1970年 | 22篇 |
1969年 | 14篇 |
排序方式: 共有3323条查询结果,搜索用时 15 毫秒
1.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
2.
J.P. Brouillet B. Hanslick T. Maudelonde M.T. Pivat J. Grenier F. Blanc H. Rochefort 《Clinical biochemistry》1991,24(6):491-496
Using a sandwich enzyme-linked immunoassay, plasma total cathepsin D concentration was assayed in 40 breast cancer patients and 84 patients with various liver diseases and compared to that of 52 normal subjects. There were no significant variations found in breast cancer patients related to tumor size, node invasiveness or metastases. In normal women, cathepsin D levels were slightly but not significantly increased in the luteal phase and in pregnancy. By contrast, plasma cathepsin D concentration was significantly increased in 70-75% of patients with liver disease (cirrhosis, hepatocarcinoma, hepatitis), but not in those with liver steatosis. Cathepsin D was independent of most of the plasma hepatic function tests and was correlated with alpha-fetoprotein in cirrhosis and with alpha-fucosidase in primary hepatocellular carcinoma. We conclude that plasma cathepsin D is not a useful marker in breast cancer. However, since the cellular level of this protease is associated with risk of metastasis in breast cancer, clinical follow-up will be required to test whether high cathepsin D plasma concentration has any prognostic value in liver cirrhosis and primary hepatocarcinoma. 相似文献
3.
4.
5.
6.
D. Chemla P. Démolis M. Thyrault D. Annane Y. Lecarpentier and JF Giudicelli 《Fundamental & clinical pharmacology》1996,10(4):393-399
Summary— The influence of local resistance and cardiac performance on peripheral blood acceleration was investigated in 14 healthy male volunteers. Steady and pulsatile flow was studied in the brachial and in the common carotid arteries, ie, two territories that exhibit marked differences in resistive characteristics. Instantaneous blood velocity (V), mean blood velocity (Vm ) and artery diameter (D) were evaluated at rest by an ultrasonic range-gated pulsed Doppler flowmeter using a double transducer probe, thus allowing the calculation of mean blood flow (Q). Mean local resistance (R) was obtained by dividing the mean arterial pressure by Q. The peak value of the local acceleration of the blood was obtained by computer-assisted calculation of the first derivative of instantaneous blood velocity (Gmax = +dV/dtmax ). Peak aortic blood acceleration (GAo) was simultaneously measured from the suprasternal notch using a pulsed Doppler velocity meter. In the brachial and the common carotid arteries, Gmax was of a similar magnitude (551 ±30 and 555 ± 44 cm/s2 , respectively) despite major differences in the respective D, Vm , Q and R values. In neither artery was there a relationship between Gmax and either resting Q or R. At the brachial artery level, Gmax was positively related to GAo ( r = 0.79, P = 0.0008). At the common carotid artery level, there was a weak, although non significant relationship between Gmax and GAo ( P = 0.08). Our results indicate that the local acceleration of peripheral blood flow in the brachial artery is related rather to upstream central impulse than to downstream hemodynamics, and suggest some regional differences in the hemodynamic determinants of the local acceleration of peripheral blood flow. 相似文献
7.
B Taillan G Barthelemy J P Routy F J Pedinielli F Zarrouk H Chardon A P Blanc 《Pathologie-biologie》1987,35(4):375-380
This article is concerned with a prospective study about the systematical, simultaneous and comparative assay of four biological markers (carcino-embryonic antigen, lactate dehydrogenase, gammaglutamyl transferase and phosphohexose isomerase). This study was conducted in a department of Hematology and oncology on 258 patients. The dosage of each marker separately does not appear to be of diagnostical interest because of a lack of sensibility and specificity. But when there is a positive statistical correlation between several makers, their simultaneous dosage may allow the diagnostic of cancer and sometimes the determination of its origin. 相似文献
8.
In a prospective, randomized, double-blind study, 49 patients underwent lumbar myelography using iotrol (24 patients) or metrizamide (25 patients). The diagnostic imaging adequacy of iotrol was comparable with that of metrizamide. After iotrol myelography, adverse reactions were fewer, less severe, and of shorter duration than were those following metrizamide myelography. Thirteen of 24 patients (54%) receiving iotrol reported some adverse reactions compared with 24 of 25 patients (96%) receiving metrizamide. Five moderate and one severe adverse reaction occurred in the group receiving iotrol. Fourteen moderate and eight severe adverse reactions occurred in the group receiving metrizamide. Thirty-eight patients underwent electroencephalography both before and after myelography (19 iotrol and 19 metrizamide). None of the EEGs obtained after iotrol myelography changed from baseline, while seven of the EEGs obtained after metrizamide myelography showed changes from baseline. Iotrol was judged superior to metrizamide as a contrast medium in this patient population. 相似文献
9.
10.