全文获取类型
收费全文 | 23152篇 |
免费 | 1538篇 |
国内免费 | 303篇 |
专业分类
耳鼻咽喉 | 409篇 |
儿科学 | 340篇 |
妇产科学 | 384篇 |
基础医学 | 3752篇 |
口腔科学 | 302篇 |
临床医学 | 1818篇 |
内科学 | 4873篇 |
皮肤病学 | 759篇 |
神经病学 | 1810篇 |
特种医学 | 1372篇 |
外科学 | 3032篇 |
综合类 | 130篇 |
现状与发展 | 1篇 |
一般理论 | 13篇 |
预防医学 | 1051篇 |
眼科学 | 784篇 |
药学 | 2004篇 |
中国医学 | 249篇 |
肿瘤学 | 1910篇 |
出版年
2023年 | 141篇 |
2022年 | 439篇 |
2021年 | 709篇 |
2020年 | 368篇 |
2019年 | 580篇 |
2018年 | 714篇 |
2017年 | 535篇 |
2016年 | 847篇 |
2015年 | 1080篇 |
2014年 | 1281篇 |
2013年 | 1421篇 |
2012年 | 2107篇 |
2011年 | 2072篇 |
2010年 | 1266篇 |
2009年 | 1058篇 |
2008年 | 1349篇 |
2007年 | 1324篇 |
2006年 | 1136篇 |
2005年 | 1102篇 |
2004年 | 927篇 |
2003年 | 738篇 |
2002年 | 698篇 |
2001年 | 346篇 |
2000年 | 346篇 |
1999年 | 295篇 |
1998年 | 152篇 |
1997年 | 109篇 |
1996年 | 99篇 |
1995年 | 89篇 |
1994年 | 65篇 |
1993年 | 66篇 |
1992年 | 153篇 |
1991年 | 151篇 |
1990年 | 124篇 |
1989年 | 162篇 |
1988年 | 115篇 |
1987年 | 116篇 |
1986年 | 100篇 |
1985年 | 84篇 |
1984年 | 67篇 |
1983年 | 47篇 |
1982年 | 30篇 |
1981年 | 33篇 |
1980年 | 31篇 |
1979年 | 38篇 |
1977年 | 27篇 |
1975年 | 28篇 |
1974年 | 28篇 |
1973年 | 25篇 |
1972年 | 26篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Three‐Dimensional Echocardiographic Evaluation of Mitral Apparatus during Preload Manipulation in Patients with Hypertrophic Cardiomyopathy
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hyemoon Chung M.D. Ji Hyun Yoon M.D. Young Won Yoon M.D. Ph.D. Ji Young Chung B.N. Jung‐Joon Cha M.D. Jong‐Youn Kim M.D. Ph.D. Pil‐Ki Min M.D. Ph.D. Byoung‐Kwon Lee M.D. Ph.D. Bum‐Kee Hong M.D. Ph.D. Se‐Joong Rim M.D. Ph.D. Hyuck Moon Kwon M.D. Eui‐Young Choi M.D. Ph.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(8):1261-1269
13.
Jin Hwan Ahn Joon Ho Wang Jae Chul Yoo Sung Kon Kim Jung Ho Park Jong Woong Park 《Knee surgery, sports traumatology, arthroscopy》2006,14(12):1288-1291
This article describes a modified suture technique designed for the vertical repair of the anterior horn of the meniscus after arthroscopic decompression of a large meniscal cyst. This procedure comprises of three steps: first, the meniscus was pierced vertically using a suture hook and a No. 0 PDS suture. Second, both ends of the No. 0 PDS on the femoral and tibial surfaces of the meniscus were pulled to the outside of the joint capsule using a spinal needle preloaded with suture material. Finally, a skin incision was made adjacent to the suture materials, and both ends were tied. We recommend this technique not only for the vertical repair of the anterior horn of the meniscus after decompression of large meniscal cyst, but also to repair a longitudinal tear of the meniscus. 相似文献
14.
Jung Yong Ahn In Bo Han Chang Ki Hong Jin Yang Joo 《Journal of clinical neuroscience》2006,13(8):872-875
Ruptured aneurysms of the distal anterior choroidal artery (AchA) are extremely rare and management is dictated by clinical presentation. This report describes a rare patient with a distal AchA aneurysm and subarachnoid and intraventricular haemorrhage. A 60-year-old woman presented with a sudden onset of severe headache and vomiting. No aneurysms could be found on initial angiograms. A repeat angiogram performed 10 days after admission demonstrated an aneurysm in a branch of the cisternal segment of the left AchA without a definite neck. Surrounding vessels showed multifocal stricture and dilatation. Microsurgical clipping was not performed because the patient died suddenly due to pulmonary failure. The aetiology of the aneurysm in this case and surgical strategy are discussed. 相似文献
15.
M. C. van den Heuvel K. P. de Jong M. Boot M. J. H. Slooff S. Poppema A. S. H. Gouw 《American journal of transplantation》2006,6(11):2660-2671
The finer branches of the biliary tree (FBBT) contain a regenerative compartment. We hypothesized that preservation of the FBBT together with its microvasculature will lead to recovery of biliary damage and prolonged preservation of bile ductules during the development of chronic liver allograft rejection. The interlobular bile ducts, portal bile ductules and extraportal biliary cells with and without microvessels were studied in sequential biopsies in five patients who fulfilled the Banff criteria of early chronic rejection (CR) (imminence group). Biopsies of CR patients (n = 12) served as controls. Biopsies were double immunostained with CD34 (microvessels) and cytokeratin 7 (biliary structures). Proliferation and proangiogenic activity were assessed with Ki67 and VEGF-A immunostaining. Severe damage of bile ducts in the imminence group did not progress to significant bile duct loss. This was associated with a high proliferative activity in all biliary structures and preservation of the microvascular compartment. VEGF-A expression was increased in all but the reperfusion biopsies. In conclusion, both regenerative activity of the FBBT and an intact microvascular compartment are associated with less damage of the biliary tree and could therefore be prerequisites for biliary regeneration. 相似文献
16.
J P Kappelhof G F Vrensen P T de Jong J Pameyer B Willekens 《American journal of ophthalmology》1986,101(1):58-69
In two pseudophakic human eyes, obtained post mortem, Elschnig's pearls were visible biomicroscopically. One eye contained a medallion lens and the other an iridocapsular lens (implanted for 53 months and 39 months, respectively). The medallion lens was fixed to the iris but was not attached to the Soemmerring's ring. Elschnig's pearls and star-shaped cells were found on the posterior capsule in the pupillary space. One loop of the iridocapsular lens was encased in the Soemmerring's ring whereas the other was located between the iris and the lens remnants. The Elschnig's pearls were on the anterior side of the ring; only a few were in the pupillary space. Two other pseudophakic eyes with clear posterior capsules also contained small numbers of Elschnig's pearls on or just near the peripheral lens remnants. 相似文献
17.
18.
19.
Outflow of aqueous humor following cyclodialysis or ciliochoroidal detachment in rabbit 总被引:1,自引:0,他引:1
Cyclodialysis and ciliochoroidal detachment were performed in three eyes of three rabbits and in three eyes of another three rabbits, respectively. After aspiration of the aqueous humor, 0.1 ml of 10% sodium fluorescein was injected intracamerally, and the eyeball was enucleated between 30 minutes and one hour after injection and prepared for fluorescence microscopy. Sodium fluorescein concentrations in the supraciliary space were much greater in the group with cyclodialysis or ciliochoroidal detachment than in the normal control group. These results suggest that (1) in the eye with cyclodialysis, the aqueous humor may freely gain access to the supraciliary space through the cleft between the anterior chamber and the supraciliary space and then be removed rapidly and (2) in the eye with ciliochoroidal detachment, the aqueous humor may pass through the uveoscleral outflow pathway. 相似文献
20.
Controlled release of lidocaine hydrochloride from the surfactant-doped hybrid xerogels. 总被引:2,自引:0,他引:2
We investigate the controlled release of lidocaine hydrochloride from the doped silica-based xerogels. In the xerogel preparation, tetraethoxysilane (TEOS), methyltriethoxysilane (MTES), and propyltriethoxysilane (PTES) are used as precursors, and a nonionic surfactant Igepal CO 720 is used as a dopant. The experimental results suggest that the release of lidocaine hydrochloride can be easily controlled by partially substituting TEOS with the organosilanes, and/or by adding the dopant. Adding the organosilane precursors lowers the release of both the drug and the surfactant in the order of TEOS, MTES/TEOS, and PTES/TEOS xerogels. The release from the PTES/TEOS xerogels is much lower than that from the other xerogels. The release of lidocaine hydrochloride is obviously suppressed by the addition of Igepal CO 720, while the release of Igepal CO 720 is slightly promoted by the addition of the drug. The overall release process is found to be diffusion-controlled, and the release behaviors can be well explained by considering the effects of the textual properties of the xerogels and the interactions among the drug, the surfactant, and the xerogel matrices. 相似文献