全文获取类型
收费全文 | 2590789篇 |
免费 | 189347篇 |
国内免费 | 7586篇 |
专业分类
耳鼻咽喉 | 34405篇 |
儿科学 | 85309篇 |
妇产科学 | 71663篇 |
基础医学 | 364333篇 |
口腔科学 | 69885篇 |
临床医学 | 234929篇 |
内科学 | 517053篇 |
皮肤病学 | 62726篇 |
神经病学 | 214039篇 |
特种医学 | 100176篇 |
外国民族医学 | 736篇 |
外科学 | 387575篇 |
综合类 | 50420篇 |
现状与发展 | 5篇 |
一般理论 | 969篇 |
预防医学 | 196414篇 |
眼科学 | 56749篇 |
药学 | 188649篇 |
8篇 | |
中国医学 | 5341篇 |
肿瘤学 | 146338篇 |
出版年
2021年 | 20139篇 |
2019年 | 20759篇 |
2018年 | 29466篇 |
2017年 | 22738篇 |
2016年 | 26372篇 |
2015年 | 29658篇 |
2014年 | 40638篇 |
2013年 | 60645篇 |
2012年 | 80614篇 |
2011年 | 84920篇 |
2010年 | 51247篇 |
2009年 | 49338篇 |
2008年 | 79397篇 |
2007年 | 84207篇 |
2006年 | 85954篇 |
2005年 | 82111篇 |
2004年 | 79114篇 |
2003年 | 76374篇 |
2002年 | 73690篇 |
2001年 | 128585篇 |
2000年 | 131504篇 |
1999年 | 110644篇 |
1998年 | 31351篇 |
1997年 | 27991篇 |
1996年 | 28292篇 |
1995年 | 27440篇 |
1994年 | 25122篇 |
1993年 | 23461篇 |
1992年 | 85277篇 |
1991年 | 81660篇 |
1990年 | 78886篇 |
1989年 | 76166篇 |
1988年 | 69573篇 |
1987年 | 68100篇 |
1986年 | 63615篇 |
1985年 | 60595篇 |
1984年 | 45017篇 |
1983年 | 37998篇 |
1982年 | 22485篇 |
1981年 | 20001篇 |
1979年 | 39009篇 |
1978年 | 27468篇 |
1977年 | 23285篇 |
1976年 | 21520篇 |
1975年 | 22834篇 |
1974年 | 26814篇 |
1973年 | 25389篇 |
1972年 | 23776篇 |
1971年 | 21979篇 |
1970年 | 20211篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
Gallstone dissolution 总被引:2,自引:0,他引:2
Many methods are available for gallstone dissolution, including oral bile salts; cholesterol solvents such as mono-octanoin or methyl tert-butyl either; and calcium or pigment solvents such as EDTA and polysorbate. Which of these approaches will be appropriate for an individual patient depends on the type of stones; whether they are in the gallbladder or the bile ducts; whether access to the biliary tree is available; the patient's age and general medical condition; and the availability of necessary expertise. In the US, both chenodeoxycholate and ursodeoxycholate are now available. Ursodeoxycholate is more expensive but appears to produce fewer side effects and may be more efficacious. These agents are most effective in thin women with small floating, radiolucent cholesterol stones in a functioning gallbladder. Only about half of the small subset of patients will experience partial or complete dissolution of stones within a year. Stone recurrence and the potential toxicity of long-term therapy are problems with this approach. Therefore, for most patients, cholecystectomy, either in the traditional fashion or using a laparoscopic approach (see article later in this issue by Gadacz et al), is the most cost-effective and perhaps the safest option. Intragallbladder instillation of methyl tert-butyl ether probably will be applicable only to a small subset of patients, and treatment is likely to be followed by a high recurrence rate. In patients with retained common duct cholesterol stones and access to the biliary tree, mono-octanoin therapy is advantageous in that it can be initiated as soon as cholangiography demonstrates no extravasation. In properly selected patients, a 90% success rate with this technique can be expected within 7 days. 相似文献
942.
943.
G Hasselgren R Jerre M Ullman A T?rnvall S Edshage 《The Journal of hand surgery, European volume》1990,15(1):35-39
Eleven patients with lunatomalacia were treated by excision of the lunate and instillation of liquid silicone. The silicone vulcanised and formed an in-situ molded prosthesis. The patients were reexamined after a mean of 7.1 years. Four patients were pain-free and two had pain only at work; three had not been improved by the operation and two had undergone arthrodesis. The patients with good results all belonged to group IV pre-operatively. Surprisingly, no patient showed any sign of silicone synovitis, although all the prostheses except one had either fractured or deformed. The reasons for this are discussed and the indications for the operation established. 相似文献
944.
T. M. Skerry M.D. M.R.C.V.S. R. Suswillo A. J. El Haj N. N. Ali R. A. Dodds L. E. Lanyon 《Calcified tissue international》1990,46(5):318-326
Summary Previous studies of Alcian blue-induced birefringence in adult avian cortical bone showed that a short period of intermittent
loading rapidly produces an increased level of orientation of proteoglycans within the bone tissue. In the absence of further
loading, this persists for over 24 hours. We have proposed that this phenomenon could provide a means for “capturing” the
effects of transient strains, and so provide a persistent, constantly updated strain-related influence on osteocyte populations
related to the bones' averaged recent strain history, in effect, a “strain memory” in bone tissue. In our present study, we
use the Alcian blue-induced birefringence technique to demonstrate that proteoglycan orientation also occurs after intermittent
loading of both cortical and cancellous mammalian bonein vivo andin vitro. We also show that the change in birefringence is proportional to the magnitude of the applied strain, and that the reorientation
occurs rapidly, reaching a maximal value after only 50 loading cycles. Examination of electron micrographs of bone tissue
after staining with cupromeronic blue allows direct visualization and quantification of the change in proteoglycan orientation
produced by loading. This shows that intermittent loading is associated with a realignment of the proteoglycan protein cores,
bringing them some 5 degrees closer to the direction of collagen fibrils in the bone matrix. 相似文献
945.
John R. Jarrett M.D. 《Aesthetic plastic surgery》1990,14(1):87-92
Immediate reconstruction of more than 1000 breasts was performed on high-risk patients on whom a prophylactic mastectomy was done. The mastectomy removes as much breast tissue as possible while leaving sufficient skin, and possibly the nipple-areola complex, to enable immediate reconstruction. The creation of symmetrical, well-balanced muscle pockets for the implant is the most important factor in producing satisfactory results in these cases. 相似文献
946.
Bladder mucosa in urethral reconstructions 总被引:6,自引:0,他引:6
947.
948.
949.
950.
Howard Morgan M.D. 《Surgical neurology》1990,33(6):413-416
The Russian writer Dostoevsky (1821–1881) suffered from a rare form of temporal lobe epilepsy termed “ec-static epilepsy.” Dostoevsky used his epileptic experiences to create Prince Myshkin, the protagonist of The Idiot. The recent case of a patient who experienced ecstatic epilepsy as a result of a temporal lobe brain tumor is presented and compared with that of Prince Myshkin. Reading Dostoevsky can give the contemporary physician an insight into the inner life of an epileptic patient — an example of how art can directly benefit medical practice. 相似文献