全文获取类型
收费全文 | 1283109篇 |
免费 | 98901篇 |
国内免费 | 1990篇 |
专业分类
耳鼻咽喉 | 18469篇 |
儿科学 | 44538篇 |
妇产科学 | 35120篇 |
基础医学 | 182879篇 |
口腔科学 | 33703篇 |
临床医学 | 111972篇 |
内科学 | 258907篇 |
皮肤病学 | 28065篇 |
神经病学 | 100968篇 |
特种医学 | 51333篇 |
外国民族医学 | 661篇 |
外科学 | 196892篇 |
综合类 | 27474篇 |
现状与发展 | 1篇 |
一般理论 | 380篇 |
预防医学 | 96121篇 |
眼科学 | 28016篇 |
药学 | 95223篇 |
2篇 | |
中国医学 | 2424篇 |
肿瘤学 | 70852篇 |
出版年
2018年 | 13215篇 |
2017年 | 10017篇 |
2016年 | 10948篇 |
2015年 | 12443篇 |
2014年 | 17271篇 |
2013年 | 26352篇 |
2012年 | 36221篇 |
2011年 | 38287篇 |
2010年 | 22903篇 |
2009年 | 21902篇 |
2008年 | 36819篇 |
2007年 | 39441篇 |
2006年 | 39702篇 |
2005年 | 38663篇 |
2004年 | 37802篇 |
2003年 | 36645篇 |
2002年 | 36009篇 |
2001年 | 64142篇 |
2000年 | 66650篇 |
1999年 | 56551篇 |
1998年 | 15189篇 |
1997年 | 13792篇 |
1996年 | 14242篇 |
1995年 | 13500篇 |
1994年 | 12802篇 |
1993年 | 11824篇 |
1992年 | 44659篇 |
1991年 | 43580篇 |
1990年 | 42302篇 |
1989年 | 40218篇 |
1988年 | 36982篇 |
1987年 | 36379篇 |
1986年 | 33721篇 |
1985年 | 32379篇 |
1984年 | 24229篇 |
1983年 | 20358篇 |
1982年 | 11792篇 |
1981年 | 10770篇 |
1980年 | 9607篇 |
1979年 | 21432篇 |
1978年 | 14881篇 |
1977年 | 12589篇 |
1976年 | 11741篇 |
1975年 | 12669篇 |
1974年 | 14723篇 |
1973年 | 14151篇 |
1972年 | 13008篇 |
1971年 | 11776篇 |
1970年 | 11091篇 |
1969年 | 10053篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
A 50-yr-old man presented with synovitis of the metacarpophalangealjoints, Raynaud's phenomenon, recurrent pericarditis and a linearpalpable rash in both axillae. 相似文献
992.
993.
994.
Eric T. Stoopler DMD res Pinto DMD Faizan Alawi DDS Sree Raghavendra DMD Ricardo Boyce Jr. DDS David Porter MD Thomas P. Sollecito DMD 《Special care in dentistry》2004,24(2):65-69
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature. 相似文献
995.
N. S. Kalson C. P. Charalambous E. S. Powell A. Hearnden J. K. Stanley 《Hand (New York, N.Y.)》2009,4(3):279-282
A common distal radio-ulnar joint (DRUJ) stabilisation procedure uses a tendon graft running from the lip of the radial sigmoid
notch to the ulnar fovea and through a bony tunnel to the ulnar shaft, before being wrapped round the distal ulna and sutured
to itself. Such graft fixation can be challenging and requires a considerable tendon length. The graft length could be reduced
by fixing the graft to the ulna using a bone anchor or interference screw. The aim of this study was to compare the strength
of three distal ulna graft fixation methods (tendon wrapping and suturing, bone anchor and interference screw). Four human
cadaveric ulnae were used. A tendon strip was run through a tunnel in the distal ulna and secured by: (1) wrapping round the
shaft and suturing it to itself, (2) a bone anchor and (3) an interference screw in the bone tunnel. Load to failure was determined
using a custom-made apparatus and an Instron machine. Maximum failure load was highest for the bone anchor fixation (99.3 ± 23.7 N)
followed by the suturing (96.2 ± 12.1 N), and the interference screw fixation (46.9 ± 5.6 N). There was no significant difference
between the tendon suturing and bone anchor methods, but the tendon suturing was statistically significantly higher compared
to the interference screw (P = 0.028). In performing anatomical stabilisation of the DRUJ fixation of the tendon graft to the distal ulna with a bone
anchor provides the most secure fixation. This may make the stabilisation technique less demanding and require a smaller tendon
graft. 相似文献
996.
BackgroundThe incidence of strictures developing after gastrojejunostomy has been reported to range from 3% to 31%. We found an unacceptably high stricture rate (13%) using a 21-mm circular stapler. Attempts to use the 25-mm circular stapler were frustrated by disparities between the size of the instrument and the patient's anatomy. We, therefore, modified the technique to accomplish the anastomosis with the linear stapler and hand sewing (LSA) at community hospitals in Southern California.MethodsA total of 124 anastomoses were accomplished with the circular stapler (CSA) followed by 100 anastomoses using the LSA technique. Drains were used routinely with the CSA technique but were used only selectively with the LSA technique. Stricture was defined as that requiring endoscopic dilation for symptoms. Leaks were confirmed radiologically or surgically, and bleeding was defined as the need for transfusion. Our analysis used the Student t test and Fisher's exact test, with P <.05 considered statistically significant.ResultsNo patient died. The LSA technique was faster and resulted in significantly fewer postoperative strictures and complications compared with the CSA technique.ConclusionThe results of our study have shown that the LSA technique, as described, is preferable to the CSA technique. 相似文献
997.
998.
999.
1000.
M Wildgruber W Weiss H Berger O Wolf H-H Eckstein P Heider 《European journal of vascular and endovascular surgery》2007,34(1):35-43
OBJECTIVES: To assess prospectively the early time course of Transforming Growth Factor beta-1 (TGFbeta-1), basic Fibroblast Growth Factor (bFGF) and Tumor Necrosis Factor alpha (TNFalpha) as possible contributors to restenosis development after angioplasty. DESIGN: Prospective Study. METHODS: The levels of the soluble forms of these factors in the early response to Percutaneous Transluminal Angioplasty (PTA) in the arteries of the lower limb were prospectively assessed. 32 patients with peripheral arterial occlusive disease (PAOD), presenting with intermittent claudication (Fontaine stage IIb) were scheduled for angioplasty treatment. Serum levels of TGFbeta-1, TNFalpha and bFGF were assessed before intervention, 15 and 60 minutes after, 24 hours after as well as 2 and 4 weeks after intervention. We compared the distribution patterns between patients treated with balloon angioplasty and patients who required secondary stent implantation. Endpoint was the development of restenosis within 6 months after interventional treatment, defined as a lumen diameter reduction of more than 50% by ultrasound measurement compared to the result after PTA. RESULTS: The patients who later developed restenosis had significantly higher levels of TGFbeta-1 at 15 minutes, 24 hours and 2 weeks after PTA (p<0.05). TNFalpha and bFGF were only detected in a few patients and no significant change of serum levels was observed. CONCLUSION: The results demonstrate a possible role of TGFbeta-1 in the formation of restenosis after PTA. 相似文献