全文获取类型
收费全文 | 3901篇 |
免费 | 258篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 72篇 |
妇产科学 | 49篇 |
基础医学 | 526篇 |
口腔科学 | 74篇 |
临床医学 | 334篇 |
内科学 | 754篇 |
皮肤病学 | 172篇 |
神经病学 | 331篇 |
特种医学 | 98篇 |
外科学 | 466篇 |
综合类 | 128篇 |
预防医学 | 278篇 |
眼科学 | 76篇 |
药学 | 351篇 |
1篇 | |
中国医学 | 49篇 |
肿瘤学 | 442篇 |
出版年
2023年 | 22篇 |
2022年 | 79篇 |
2021年 | 115篇 |
2020年 | 57篇 |
2019年 | 86篇 |
2018年 | 99篇 |
2017年 | 99篇 |
2016年 | 110篇 |
2015年 | 138篇 |
2014年 | 182篇 |
2013年 | 212篇 |
2012年 | 302篇 |
2011年 | 261篇 |
2010年 | 173篇 |
2009年 | 126篇 |
2008年 | 199篇 |
2007年 | 213篇 |
2006年 | 179篇 |
2005年 | 216篇 |
2004年 | 167篇 |
2003年 | 163篇 |
2002年 | 149篇 |
2001年 | 102篇 |
2000年 | 74篇 |
1999年 | 70篇 |
1998年 | 26篇 |
1997年 | 27篇 |
1996年 | 16篇 |
1995年 | 22篇 |
1994年 | 26篇 |
1993年 | 16篇 |
1992年 | 50篇 |
1991年 | 33篇 |
1990年 | 26篇 |
1989年 | 21篇 |
1988年 | 34篇 |
1987年 | 30篇 |
1986年 | 22篇 |
1985年 | 15篇 |
1984年 | 12篇 |
1983年 | 15篇 |
1982年 | 11篇 |
1980年 | 11篇 |
1977年 | 15篇 |
1976年 | 17篇 |
1972年 | 23篇 |
1970年 | 17篇 |
1969年 | 10篇 |
1968年 | 11篇 |
1967年 | 12篇 |
排序方式: 共有4218条查询结果,搜索用时 109 毫秒
1.
Anders Elm Pedersen Esben Gjerløff Wedebye Schmidt Jesper Freddie Sørensen Carsten Faber Boye Schnack Nielsen Kim Holmstrøm Silje Haukali Omland Peter Tougaard Søren Skov Bo Bang 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2015,123(7):547-555
TL1A is a TNF‐like cytokine which has been shown to co‐stimulate TH1 and TH17 responses during chronic inflammation. The expression of this novel cytokine has been investigated in inflammatory disorders like rheumatoid arthritis and inflammatory bowel disease, but little is known about expression and induction in psoriasis. Indeed, the pathogenesis in psoriasis is still not fully understood and it is speculated that cytokines other than TNF‐α are important in subsets of patients. Also, for patients with severe disease that are treated with systemic anti‐TNF‐α blockade, novel candidates to be used as disease and response biomarkers are of high interest. Here, we demonstrate TL1A expression in biopsies from psoriatic lesions. Also, we investigated spontaneous and induced TL1A secretion from PBMCs and blood levels from a cohort of psoriasis patients. Here, increased spontaneous secretion from PBMCs was observed as compared to healthy controls and a small subset of patients had highly elevated TL1A in the blood. Interestingly, activation of PBMCs with various cytokines showed a decreased sensitivity for TL1A activation in psoriasis patients compared to healthy controls.TL1A levels in blood and biopsies could not be correlated with disease activity with this patient cohort. Thus, additional large‐scale studies are warranted to investigate TL1A as a biomarker. 相似文献
2.
Ragnhild B. Wijma Marloes Emous Merel van den Broek Anke Laskewitz Anneke C. Muller Kobold André P. van Beek 《Surgery for obesity and related diseases》2019,15(1):73-81
Background
Early dumping is a poorly defined and incompletely understood complication after Roux-en-Y gastric (RYGB).Objective
We performed a mixed-meal tolerance test in patients after RYGB to address the prevalence of early dumping and to gain further insight into its pathophysiology.Setting
The study was conducted in a regional hospital in the northern part of the Netherlands.Methods
From a random sample of patients who underwent primary RYGB between 2008 and 2011, 46 patients completed the mixed-meal tolerance test. The dumping severity score for early dumping was assessed every 30 minutes. A sum score at 30 or 60 minutes of ≥5 and an incremental score of ≥3 points were defined as indicating a high suspicion of early dumping. Blood samples were collected at baseline, every 10 minutes during the first half hour, and at 60 minutes after the start.Results
The prevalence of a high suspicion of early dumping was 26%. No differences were seen for absolute hematocrit value, inactive glucagon-like peptide-1, and vasoactive intestinal peptide between patients with or without early dumping. Patients at high suspicion of early dumping had higher levels of active glucagon-like peptide-1 and peptide YY.Conclusion
The prevalence of complaints at high suspicion of early dumping in a random population of patients after RYGB is 26% in response to a mixed-meal tolerance test. Postprandial increases in both glucagon-like peptide-1 and peptide YY are associated with symptoms of early dumping, suggesting gut L-cell overactivity in this syndrome. 相似文献3.
Frank Lindseth Thomas Lang? Jon Bang Toril A Nagelhus Hernes 《Computer aided surgery》2002,7(4):197-222
4.
The purpose of this study was to describe health experiences, focused on gender and return to work, in subjects with chronic low back pain in a long-term perspective. The convenient sample consisted of 12 subjects who had attended a pain rehabilitation program 6 years earlier. Typed interviews were transcribed, and a content analysis approach was used. Five categories were found: coping, root causes, control/influence, pain, and sleep. The interviews showed that the subjects expressed well-being, although pain had become part of their daily life. However, both gender and well-being group differences were identified. The women and the group with reduced well-being used the root causes category in a higher degree than the men and the well-being group did. The conclusion is that there are differences according to both gender and return to work within the subjects with chronic pain and that these differences are related to both root causes and coping pattern. 相似文献
5.
6.
7.
Palmar advancement flap with V-Y closure for thumb tip injuries 总被引:1,自引:0,他引:1
Hwang-hyun Bang MD Tadao Kojima MD Hiroyuki Hayashi MD 《The Journal of hand surgery》1992,17(5):933-934
The palmar advancement flap with V-Y closure was used in two patients with thumb tip injuries. This technique allows more distal advancement of the flap than does a conventional palmar advancement flap and does not require skin graft coverage. 相似文献
8.
J. A. P. van de Nes A. A. Sluiter C. W. Pool W. Kamphorst R. Ravid D. F. Swaab 《Brain research》1994,655(1-2)
The monoclonal antibody Alz-50 is directed against Alzheimer's disease-related modified tau proteins and reveals cytoskeletal changes, i.e. neurofibrillary tangles and dystrophic neurites. The present study shows that, in the hypothalamus of non-demented control subjects, this same antibody gives a distinctive staining pattern of a subpopulation of somatostatin neurons and beaded fibers. Furthermore, Alz-50 occasionally recognizes somatostatin-containing cell bodies and dystrophic neurite-like fibers in the (neuritic) senile plaques of AD patients. These observations have direct consequences for the interpretation of Alz-50 staining in diagnostic usage and for the assessment of Alzheimer's disease-like changes induced by β-amyloid in experimental animal brains. On dot spotting, Alz-50 was found to bind to a number of fragments from the somatostatin precursor, of which somatostatin15–28 stained best. Preadsorption of Alz-50 by somatostatin15–28, as well as other specificity tests, failed, however, to provide any clue to the nature of the unknown compound(s) stained in the control hypothalamus. 相似文献
9.
Role of plasminogen-activator inhibitor type 1 in the pathogenesis and outcome of the hemolytic uremic syndrome. 总被引:5,自引:0,他引:5
BACKGROUND. Deposition of fibrin in glomeruli and renal failure are characteristic features of the hemolytic uremic syndrome. An inhibitor of glomerular fibrinolysis has been detected in plasma from children with this disorder. In this study, we define the inhibitor and show that its plasma level is correlated with the outcome of the disease. METHODS AND RESULTS. Plasminogen-activator inhibitor type 1 (PAI-1) in plasma was measured with an assay employing a specific monoclonal antibody in 40 consecutive children hospitalized with the hemolytic uremic syndrome: 12 who recovered adequate renal function (serum creatinine, less than or equal to 2.0 mg per deciliter [177 mumol per liter]) without dialysis, 23 who recovered adequate renal function after peritoneal dialysis, and 5 who did not recover adequate renal function after undergoing dialysis. At presentation, plasma PAI-1 levels were higher in the patients with the hemolytic uremic syndrome than in nine children with other forms of acute renal failure. That the inhibitor was PAI-1 was indicated by the fact that it was a potent inhibitor of tissue plasminogen activator, was acid-resistant, and was not inhibited by denaturation (all unique traits of PAI-1) and that it was neutralized by an antibody specific for PAI-1. Multivariate discriminant-function analysis revealed that the duration of elevated PAI-1 activity was strongly correlated with the outcome of the disease (P less than 0.001). Peritoneal dialysis reduced plasma PAI-1 levels dramatically. CONCLUSIONS. Our studies suggest that PAI-1 is the circulating inhibitor of fibrinolysis in the hemolytic uremic syndrome. Normalization of plasma PAI-1 levels (e.g., by peritoneal dialysis) is correlated with improvement in renal function. However, the possibility that increased plasma levels of PAI-1 are either causes or effects of the hemolytic uremic syndrome is not unequivocally established by these studies. 相似文献
10.
Bum Soon Choi Mi Jung Shin Suk Joon Shin Young Soo Kim Yeong Jin Choi Yong-Soo Kim In Sung Moon Suk Young Kim Yong Bok Koh Byung Kee Bang Chul Woo Yang 《American journal of transplantation》2005,5(6):1354-1360
We report here our 10-year experience of a biopsy performed at day 14 after transplantation in 304 patients with stable graft function. The factors that may have influenced subclinical rejection were analyzed according to histology. The incidence of subclinical rejection was 13.2%. Addition of mycophenolate mofetile (MMF) as a primary immunosuppressant significantly decreased the incidence of subclinical rejection compared with patients without such treatment (odds ratio, 0.23; p < 0.05). On the other hand, HLA-DR antigen mismatch (odds ratio, 2.39) and unrelated donor (odds ratio, 2.10) were also significantly associated with decreased subclinical rejection (p < 0.05). The incidence of acute rejection in patients with normal findings was lower than in those with borderline changes or subclinical rejection (0.23 +/- 0.05 vs. 0.48 +/- 0.07 and 0.60 +/- 0.11, respectively; p < 0.05). The graft survival rates in patients with subclinical rejection were lower than in patients with normal or borderline changes at 1 (88.4% vs. 97.9% and 99.1%; p < 0.05), 5 (77.8% vs. 96.2% and 95.9%; p < 0.05) and 10 (62.3% vs. 96.2% and 93.7%; p < 0.05) years. Thus, a protocol biopsy performed on day 14 after transplantation is useful for predicting graft survival. Triple therapy including MMF, related donor and HLA-DR antigen match are important factors for reducing subclinical rejection in living-donor renal transplantation. 相似文献