全文获取类型
收费全文 | 1304篇 |
免费 | 92篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 31篇 |
妇产科学 | 24篇 |
基础医学 | 142篇 |
口腔科学 | 18篇 |
临床医学 | 133篇 |
内科学 | 369篇 |
皮肤病学 | 7篇 |
神经病学 | 92篇 |
特种医学 | 72篇 |
外科学 | 229篇 |
综合类 | 19篇 |
预防医学 | 118篇 |
眼科学 | 46篇 |
药学 | 70篇 |
肿瘤学 | 27篇 |
出版年
2021年 | 19篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 11篇 |
2016年 | 22篇 |
2015年 | 18篇 |
2014年 | 25篇 |
2013年 | 27篇 |
2012年 | 48篇 |
2011年 | 51篇 |
2010年 | 36篇 |
2009年 | 28篇 |
2008年 | 52篇 |
2007年 | 57篇 |
2006年 | 52篇 |
2005年 | 62篇 |
2004年 | 48篇 |
2003年 | 40篇 |
2002年 | 47篇 |
2001年 | 28篇 |
2000年 | 37篇 |
1999年 | 25篇 |
1998年 | 31篇 |
1997年 | 29篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 52篇 |
1991年 | 37篇 |
1990年 | 41篇 |
1989年 | 36篇 |
1988年 | 36篇 |
1987年 | 37篇 |
1986年 | 21篇 |
1985年 | 32篇 |
1984年 | 17篇 |
1983年 | 19篇 |
1982年 | 16篇 |
1981年 | 11篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1977年 | 10篇 |
1976年 | 11篇 |
1975年 | 8篇 |
1974年 | 9篇 |
1973年 | 13篇 |
1971年 | 12篇 |
1969年 | 11篇 |
1966年 | 11篇 |
排序方式: 共有1403条查询结果,搜索用时 15 毫秒
1.
2.
3.
Outcomes were compared between consecutive patients who had received either total lymphoid irradiation (TLI) or immunosuppressant treatment for intractable rheumatoid arthritis (RA). There were 33 TLI and 32 immunosuppressive recipients; all patients had failed standard therapy. Average followup from the start of therapy was 2.7 years for TLI and 5.9 years for immunosuppressive recipients. Final disability levels were the same in both groups; mortality was equal in both groups as well. There were more hospitalizations for infections in the TLI group and the infecting organisms tended to be staphylococcus or gram negative organisms. Apart from infections, there were more adverse effects reported in the immunosuppressive therapy group. 相似文献
4.
J Heckenkamp K Lieder E Lang M Aleksic M S Bendel M Gawenda J W U Fries J S Brunkwall 《European journal of vascular and endovascular surgery》2005,29(5):463-469
OBJECTIVES: The aim of this study was to investigate if radiation therapy (RT) favorably modulates wound healing at vein graft anastomoses. MATERIALS AND METHODS: Jugular vein grafts were sewn into carotid arteries in 32 rats which were randomly divided into two groups: RT (gamma source, 14 Gray, n=16) and control (C, sham irradiation, n=16). Grafts and adjacent arteries were analyzed at 2 (n=8) and 8 weeks (n=8) by histology, immunohistochemistry, and morphometry. RESULTS: Although, RT did not reduce the overall occurrence of intimal hyperplasia, the distribution differed. RT led to a reduction of intimal hyperplasia in arterial segments (median: C: 41.873 microm2; RT: 6.452 microm2, p < 0.0007). In contrast, RT augmented intimal hyperplasia in vein grafts (median: C: 30.287 microm2; RT: 90.455 microm2, p < 0.014). Vein graft diameters after RT were enlarged (median: C: 2.098 microm; RT: 3.381, p < 0.031). Over 80% of the cells were of mesenchymal origin in both groups. CONCLUSIONS: RT reduced intimal hyperplasia in arterial segments. However, RT led to graft dilatation and increased intimal hyperplasia in vein grafts. RT did not favorably modulate the vascular wound healing response in this model. 相似文献
5.
Soren P. Lund Leif Simonsen Adolf S. Fries 《Basic & clinical pharmacology & toxicology》1995,76(1):36-40
Abstract: The effects of repeated exposure to 20 p.p.m. 4-tert-butyltoIuene (CAS No. [98-51-1]) 6 hr/day for 14 days on the function of the intact nervous system were examined by measurements of flash evoked potentials in Wistar rats. The exposure to 4-tert-butyltoluene induced changes in the amplitudes of the flash evoked potentials. The changes were significantly different from controls on day 2, 19 and 26 after cessation of the exposure, but not on day 5 and 12. No significant difference in body weight gain between groups was found during the experiment. These results indicate that repeated exposure to 20 p.p.m. 4-tert-butyltoluene causes persistent changes in the function of the central nervous system measured as changes in the flash evoked potential. A reevaluation of the present TLV-value of 10 p.p.m. for 4-tert-butyltoluene is suggested. 相似文献
6.
Aorto-femoral angiography carried out in 839 patients revealed that 139 males and females had uni- or bilateral occlusion of the common or external iliac arteries. Pelvic or lumbar/intercostal arteries served as collaterals in 786 patients. In the remaining 53 patients the collateral blood supply originated from the thoracic arteries. Among the 53 patients, only 7 were females. A chi 2-test revealed the difference to be significant (p less than 0.0005), indicating a sex-linked difference, a male preponderance, in the development of collateral circulation of thoracic origin. 相似文献
7.
Günther Sumann Dietmar Fries Andrea Griesmacher Gerda Falkensammer Anton Klingler Arnold Koller Werner Streif Sven Greie Beatrix Schobersberger Wolfgang Schobersberger 《Blood coagulation & fibrinolysis》2007,18(5):435-440
Prolonged physical exercise is associated with multiple changes in blood hemostasis. Eccentric muscle activation induces microtrauma of skeletal muscles, inducing an inflammatory response. Since there is a link between inflammation and coagulation we speculated that downhill running strongly activates the coagulation system. Thirteen volunteers participated in the Tyrolean Speed Marathon (42,195 m downhill race, 795 m vertical distance). Venous blood was collected 3 days (T1) and 3 h (T2) before the run, within 30 min after finishing (T3) and 1 day thereafter (T4). We measured the following key parameters: creatine kinase, myoglobin, thrombin-antithrombin complex, prothrombin fragment F1 + 2, D-dimer, plasmin-alpha(2)-antiplasmin complexes, tissue-type plasminogen activator antigen, plasminogen-activator-inhibitor-1 antigen and thrombelastography with ROTEM [intrinsic pathway (InTEM) clotting time, clot formation time, maximum clot firmness, alpha angle]. Thrombin generation was evaluated by the Thrombin Dynamic Test and the Technothrombin TGA test. Creatine kinase and myoglobin were elevated at T3 and further increased at T4. Thrombin-antithrombin complex, prothrombin fragment F1 + 2, D-dimer, plasmin-alpha(2)-antiplasmin complexes, tissue-type plasminogen activator antigen and plasminogen-activator-inhibitor-1 antigen were significantly increased at T3. ROTEM analysis exhibited a shortening of InTEM clotting time and clot formation time after the marathon, and an increase in InTEM maximum clot firmness and alpha angle. Changes in TGA were indicative for thrombin generation after the marathon. We demonstrated that a downhill marathon induces an activation of coagulation, as measured by specific parameters for coagulation, ROTEM and thrombin generation assays. These changes were paralleled by an activation of fibrinolysis indicating a preserved hemostatic balance. 相似文献
8.
Stefan Beckers Michael Fries Johannes Bickenbach Matthias Derwall Ralf Kuhlen Rolf Rossaint 《Critical care (London, England)》2004,9(2):R110
Introduction
There is evidence that use of automated external defibrillators (AEDs) by laypersons improves rates of survival from cardiac arrest, but there is no consensus on the optimal content and duration of training for this purpose. In this study we examined the use of semiautomatic or automatic AEDs by laypersons who had received no training (intuitive use) and the effects of minimal general theoretical instructions on their performance. 相似文献9.
Balloon dacryocystoplasty: indications and contraindications 总被引:3,自引:0,他引:3
10.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献