全文获取类型
收费全文 | 47342篇 |
免费 | 4622篇 |
国内免费 | 3719篇 |
专业分类
耳鼻咽喉 | 393篇 |
儿科学 | 491篇 |
妇产科学 | 625篇 |
基础医学 | 5637篇 |
口腔科学 | 1029篇 |
临床医学 | 6162篇 |
内科学 | 7015篇 |
皮肤病学 | 525篇 |
神经病学 | 2462篇 |
特种医学 | 1830篇 |
外国民族医学 | 23篇 |
外科学 | 4922篇 |
综合类 | 8155篇 |
现状与发展 | 16篇 |
一般理论 | 6篇 |
预防医学 | 3158篇 |
眼科学 | 1223篇 |
药学 | 4909篇 |
42篇 | |
中国医学 | 2981篇 |
肿瘤学 | 4079篇 |
出版年
2024年 | 167篇 |
2023年 | 740篇 |
2022年 | 1941篇 |
2021年 | 2432篇 |
2020年 | 1858篇 |
2019年 | 1571篇 |
2018年 | 1664篇 |
2017年 | 1570篇 |
2016年 | 1436篇 |
2015年 | 2153篇 |
2014年 | 2706篇 |
2013年 | 2295篇 |
2012年 | 3365篇 |
2011年 | 3637篇 |
2010年 | 2218篇 |
2009年 | 1831篇 |
2008年 | 2340篇 |
2007年 | 2394篇 |
2006年 | 2347篇 |
2005年 | 2123篇 |
2004年 | 1736篇 |
2003年 | 1848篇 |
2002年 | 1659篇 |
2001年 | 1410篇 |
2000年 | 1244篇 |
1999年 | 1336篇 |
1998年 | 893篇 |
1997年 | 824篇 |
1996年 | 641篇 |
1995年 | 598篇 |
1994年 | 518篇 |
1993年 | 260篇 |
1992年 | 349篇 |
1991年 | 289篇 |
1990年 | 275篇 |
1989年 | 221篇 |
1988年 | 213篇 |
1987年 | 175篇 |
1986年 | 147篇 |
1985年 | 91篇 |
1984年 | 76篇 |
1983年 | 33篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 14篇 |
1979年 | 6篇 |
1978年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Intractable tinnitus can lead to serious consequences. Study evidence indicates that the central nervous system is involved in generation and maintenance of chronic tinnitus and that tinnitus and other neurologic symptoms such as chronic pain may share similar mechanisms. Brain ablation and stimulation are used to treat chronic pain with success. Recent studies showed that ablation and stimulation in non-auditory areas resulted in tinnitus improvement. Deep brain stimulation (DBS) may be an alternative treatment for intractable tinnitus and deserves further study. 相似文献
4.
Shang-Jin Shi Hiromi Rakugi Koichi Higashimori Jitsuo Higaki Hiroshi Mikami Toshio Ogihara 《Clinical and experimental pharmacology & physiology》1994,21(10):767-773
1. We previously reported that angiotensin II release from the mesenteric arteries of Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR) increased in a time-dependent manner as a result of the isolation of the arteries and perfusion. This phenomenon appeared to be due to the withdrawal of circulating angiotensin II (AII). 2. The purpose of the present study was to test the hypothesis that vascular AII generation may be negatively regulated by circulating AII in WKY and SHR, and to clarify the role of this vascular angiotensin II in the sustained hypertension of SHR following nephrectomy. 3. The mesenteric arteries from kidney-intact and nephrectomized WKY and SHR were perfused and the amount of AII released into the perfusate was measured. The effects of the angiotensin converting enzyme inhibitor, captopril, and the effects of supplementation of renal renin and circulating angiotensins to nephrectomized rats, by blood exchange between kidney-intact and nephrectomized rats, on AII release were examined to clarify the pathway of vascular AII generation after nephrectomy. 4. Nephrectomy caused augmentation of vascular AII release both in WKY and SHR in spite of the abolishment of circulating renin. Captopril reduced this enhanced release of AII, but blood exchange did not affect it. There was no significant difference in these responses between WKY and SHR. 5. These results suggest that WKY and SHR have in common a potent pathway for production of vascular AII in response to the withdrawal of circulating AII, although this pathway is not responsible for the sustained hypertension of SHR after nephrectomy. The precise pathophysiological role of this pathway remains to be elucidated. 相似文献
5.
6.
7.
Zhipan Zhang Gaoquan Shi 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》2004,569(2):197-202
Poly (3-phenylthiophene) (P3PhT) films have been electrochemically synthesized by direct oxidation of 3-phenylthiophene in the electrolyte of pure boron trifluoride diethyl etherate (BFEE). The oxidation potential of the monomer was measured to be 1.29 V (vs. SCE), and about 0.15 V lower than that measured in a neutral medium of acetonitrile. Free-standing P3PhT film with tensile strength of 32–40 MPa has been obtained for the first time. The morphology and the structure of the polymer film have been studied by scanning electron microscopy, infrared and Raman spectroscopies. Raman spectral results demonstrated that the doping level of the P3PhT film increased with film thickness during electrochemical growth process. 相似文献
8.
Stem cells and periodontal regeneration 总被引:10,自引:0,他引:10
9.
Z-Y Sun J Wei L Xie Y Shen S-Z Liu G-Z Ju J-P Shi Y-Q Yu X Zhang Q Xu G P Hemmings 《European psychiatry》2004,19(6):354-357
The present study was designed to detect three single nucleotide polymorphisms (SNPs) located on 22q11 that was thought as being of particularly importance for genetic research into schizophrenia. We recruited a total of 176 Chinese family trios of Han descent, consisting of mothers, fathers and affected offspring with schizophrenia for the genetic analysis. The transmission disequilibrium test (TDT) showed that of three SNPs, rs10314 in the 3'-untranslated region of the CLDN5 locus was associated with schizophrenia (chi(2) = 4.75, P = 0.029). The other two SNPs, rs1548359 present in the CDC45L locus centromeric of rs10314 and rs739371 in the 5'-flanking region of the CLDN5 locus, did not show such an association. The global chi-square (chi(2)) test showed that the 3-SNP haplotype system was not associated with schizophrenia although the 1-df test for individual haplotypes showed that the rs1548359(C)-rs10314(G)-rs739371(C) haplotype was excessively non-transmitted (chi(2) = 5.32, P = 0.02). Because the claudin proteins are a major component for barrier-forming tight junctions that could play a crucial role in response to changing natural, physiological and pathological conditions, the CLDN5 association with schizophrenia may be an important clue leading to look into a meeting point of genetic and environmental factors. 相似文献
10.
Jiyou Li Yuquan Xie Guizhi Shi Heling Sun Xinhua Ji Maolin Jin Boqin Yang Mingsheng Wang 《中国癌症研究》1992,4(2):10-12
In order to investigate the antagonistic effect of Glycyrrhiza Uralensis Fish (GUF) and Chelidonium maJus L (CML) on gastrccarcinogenesis
induced by MNNG in Wastar rats, we treated the rats with MNNG alone (group 1) and with MNNG plus GUF and CML (group 2 and
3) respectively. The incidence of infiltrating adenocarcinoma of the glandular stomach and duodenum in group 2 was significantly
lower than that in group 1 (26.7% vs. 67.8%). The differentiation and aggressivenees of carcinomas occured in group 2 were
much better and mild than those in group 1. Present study also demonstrated that the inhibitory effect of CML on proliferation
of human stomach carcinoma cell line MGC-803 was very remarkable; in addition, GUF and CML were able to antagonise the mutagenic
activation of MNNG. These results suggest that GUF and CML may be empoyed in prevention of gastric carcinoma. 相似文献