全文获取类型
收费全文 | 989篇 |
免费 | 37篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 39篇 |
妇产科学 | 10篇 |
基础医学 | 86篇 |
口腔科学 | 22篇 |
临床医学 | 87篇 |
内科学 | 203篇 |
皮肤病学 | 9篇 |
神经病学 | 70篇 |
特种医学 | 173篇 |
外科学 | 65篇 |
综合类 | 17篇 |
预防医学 | 25篇 |
眼科学 | 9篇 |
药学 | 60篇 |
肿瘤学 | 189篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 6篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 16篇 |
2017年 | 8篇 |
2016年 | 6篇 |
2015年 | 18篇 |
2014年 | 18篇 |
2013年 | 16篇 |
2012年 | 21篇 |
2011年 | 28篇 |
2010年 | 32篇 |
2009年 | 41篇 |
2008年 | 25篇 |
2007年 | 59篇 |
2006年 | 25篇 |
2005年 | 26篇 |
2004年 | 25篇 |
2003年 | 30篇 |
2002年 | 24篇 |
2001年 | 29篇 |
2000年 | 31篇 |
1999年 | 26篇 |
1998年 | 59篇 |
1997年 | 48篇 |
1996年 | 44篇 |
1995年 | 32篇 |
1994年 | 26篇 |
1993年 | 35篇 |
1992年 | 21篇 |
1991年 | 19篇 |
1990年 | 17篇 |
1989年 | 32篇 |
1988年 | 21篇 |
1987年 | 28篇 |
1986年 | 15篇 |
1985年 | 21篇 |
1984年 | 17篇 |
1983年 | 16篇 |
1982年 | 14篇 |
1981年 | 17篇 |
1980年 | 20篇 |
1979年 | 6篇 |
1978年 | 9篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1975年 | 5篇 |
1973年 | 3篇 |
排序方式: 共有1065条查询结果,搜索用时 15 毫秒
51.
Warkentin TE; Hayward CP; Boshkov LK; Santos AV; Sheppard JA; Bode AP; Kelton JG 《Blood》1994,84(11):3691-3699
Heparin-induced thrombocytopenia is characterized by moderate thrombocytopenia and thrombotic complications, whereas quinine/quinidine-induced thrombocytopenia usually presents with severe thrombocytopenia and bleeding. Using flow cytometry and assays of procoagulant activity, we investigated whether sera from patients with these immune drug reactions could stimulate normal platelets to generate platelet-derived microparticles with procoagulant activity. Sera or purified IgG from patients with heparin-induced thrombocytopenia stimulated the formation of platelet-derived microparticles in a heparin-dependent fashion. Further studies showed that heparin-induced thrombocytopenia sera also produced a marked increase in procoagulant activity. In contrast, sera from patients with quinine- or quinidine-induced thrombocytopenia did not generate platelet-derived microparticles nor generate increased procoagulant activity. However, quinine/quinidine-induced thrombocytopenia sera produced a significant increase in the binding of IgG to platelets in a drug-dependent fashion, whereas sera from patients with heparin-induced thrombocytopenia demonstrated no drug-dependent binding of IgG to platelets. We also observed increased levels of circulating microparticles in patients with acute heparin-induced thrombocytopenia compared with control patients. Our observations indicate that the generation of procoagulant platelet-derived microparticles in vivo is a plausible explanation for the thrombotic complications observed in some patients with heparin-induced thrombocytopenia. 相似文献
52.
53.
54.
Many people believe that euthanasia and assisted suicide are condoned carte blanche in the Netherlands. Not true. Both are formally forbidden by criminal law and can be administered only when certain procedures and criteria have been followed. Below, a look at the policies and practices regarding euthanasia and assisted suicide in The Netherlands and the role of nurses in this area. 相似文献
55.
56.
Jack X Yu Anieta M Sieuwerts Yi Zhang John WM Martens Marcel Smid Jan GM Klijn Yixin Wang John A Foekens 《BMC cancer》2007,7(1):182
Background
Published prognostic gene signatures in breast cancer have few genes in common. Here we provide a rationale for this observation by studying the prognostic power and the underlying biological pathways of different gene signatures. 相似文献57.
Christine Desmedt Fanny Piette Sherene Loi Yixin Wang Fran?oise Lallemand Benjamin Haibe-Kains Giuseppe Viale Mauro Delorenzi Yi Zhang Mahasti Saghatchian d'Assignies Jonas Bergh Rosette Lidereau Paul Ellis Adrian L Harris Jan G M Klijn John A Foekens Fatima Cardoso Martine J Piccart Marc Buyse Christos Sotiriou 《Clinical cancer research》2007,13(11):3207-3214
PURPOSE: Recently, a 76-gene prognostic signature able to predict distant metastases in lymph node-negative (N(-)) breast cancer patients was reported. The aims of this study conducted by TRANSBIG were to independently validate these results and to compare the outcome with clinical risk assessment. EXPERIMENTAL DESIGN: Gene expression profiling of frozen samples from 198 N(-) systemically untreated patients was done at the Bordet Institute, blinded to clinical data and independent of Veridex. Genomic risk was defined by Veridex, blinded to clinical data. Survival analyses, done by an independent statistician, were done with the genomic risk and adjusted for the clinical risk, defined by Adjuvant! Online. RESULTS: The actual 5- and 10-year time to distant metastasis were 98% (88-100%) and 94% (83-98%), respectively, for the good profile group and 76% (68-82%) and 73% (65-79%), respectively, for the poor profile group. The actual 5- and 10-year overall survival were 98% (88-100%) and 87% (73-94%), respectively, for the good profile group and 84% (77-89%) and 72% (63-78%), respectively, for the poor profile group. We observed a strong time dependence of this signature, leading to an adjusted hazard ratio of 13.58 (1.85-99.63) and 8.20 (1.10-60.90) at 5 years and 5.11 (1.57-16.67) and 2.55 (1.07-6.10) at 10 years for time to distant metastasis and overall survival, respectively. CONCLUSION: This independent validation confirmed the performance of the 76-gene signature and adds to the growing evidence that gene expression signatures are of clinical relevance, especially for identifying patients at high risk of early distant metastases. 相似文献
58.
Association of an extracellular matrix gene cluster with breast cancer prognosis and endocrine therapy response 总被引:1,自引:0,他引:1
Jozien Helleman Maurice P H M Jansen Kirsten Ruigrok-Ritstier Iris L van Staveren Maxime P Look Marion E Meijer-van Gelder Anieta M Sieuwerts Jan G M Klijn Stefan Sleijfer John A Foekens Els M J J Berns 《Clinical cancer research》2008,14(17):5555-5564
PURPOSE: We previously discovered an extracellular matrix (ECM) gene cluster associated with resistance to first-line tamoxifen therapy of patients with metastatic breast cancer. In this study, we determined whether the six individual ECM genes [collagen 1A1 (COL1A1), fibronectin 1 (FN1), lysyl oxidase (LOX), secreted protein acidic cysteine-rich (SPARC), tissue inhibitor of metalloproteinase 3 (TIMP3), and tenascin C (TNC)] were associated with treatment response, prognosis, or both. EXPERIMENTAL DESIGN: In 1,286 primary breast tumors, mRNA expression (quantitative real-time PCR) was related to clinicopathologic factors and disease outcome in univariate and multivariate analysis including traditional factors. RESULTS: TIMP3, FN1, LOX, and SPARC expression levels (continuous variables) were significantly associated with distant metastasis-free survival (MFS) in 680 lymph node-negative untreated patients (P<0.03). Using a calculated linear prognostic score, these patients were evenly divided into five prognostic groups with a significant difference in 10-year MFS of approximately 40% between the two extreme prognostic groups. Furthermore, high TNC expression as continuous variable was associated with (a) shorter MFS in 139 estrogen receptor-positive and lymph node-positive patients who received adjuvant tamoxifen therapy (hazard ratio, 1.53; P=0.001), and (b) no clinical benefit (odds ratio, 0.81; P=0.035) and shorter progression-free survival (hazard ratio, 1.19; P=0.002) in 240 patients in whom recurrence was treated with tamoxifen as first-line monotherapy. These results were also significant in multivariate analyses. CONCLUSION: FN1, LOX, SPARC, and TIMP3 expression levels are associated with the prognosis of patients with breast cancers, whereas TNC is associated with resistance to tamoxifen therapy. Further validation and functional studies are necessary to determine the use of these ECM genes in decisions regarding treatment and whether they can serve as targets for therapy. 相似文献
59.
60.
PURPOSE: There is growing interest in preputial reconstruction combined with hypospadias repair. We retrospectively analyzed its results for future developments and patient information. MATERIALS AND METHODS: We evaluated 77 boys who underwent distal hypospadias repair combined with preputial reconstruction to determine complications, risks and failures. RESULTS: At a mean followup of 2.5 years 52 patients had an anatomically normal penis with a normal retractable foreskin, while 25 (33%) presented with a complication. The most common complications were partial dehiscence, and fistula of the prepuce and urethra. There was a complication of the reconstructed foreskin only in 16 cases (21%), a combined problem with the reconstructed foreskin and reconstructed urethra in 7 (9%), and a problem with the reconstructed urethra in 2 (3%). Of the 25 patients with complications 19 underwent reoperation with closure of the fistula or dehiscence and 5 were circumcised, while in 1 the parents accepted the minor cosmetic problem and refused reoperation. CONCLUSIONS: Preputial repair combined with hypospadias repair may lead to anatomically correct reconstruction of the penis at the cost of a 33% complication rate. Parents are informed about this risk and to date in 15% of all boys with distal hypospadias the parents have elected preputial reconstruction. 相似文献