全文获取类型
收费全文 | 6558篇 |
免费 | 481篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 52篇 |
儿科学 | 108篇 |
妇产科学 | 64篇 |
基础医学 | 1073篇 |
口腔科学 | 47篇 |
临床医学 | 803篇 |
内科学 | 1753篇 |
皮肤病学 | 91篇 |
神经病学 | 578篇 |
特种医学 | 228篇 |
外科学 | 873篇 |
综合类 | 20篇 |
预防医学 | 512篇 |
眼科学 | 45篇 |
药学 | 456篇 |
中国医学 | 9篇 |
肿瘤学 | 359篇 |
出版年
2023年 | 30篇 |
2022年 | 42篇 |
2021年 | 179篇 |
2020年 | 89篇 |
2019年 | 164篇 |
2018年 | 186篇 |
2017年 | 108篇 |
2016年 | 120篇 |
2015年 | 182篇 |
2014年 | 257篇 |
2013年 | 304篇 |
2012年 | 502篇 |
2011年 | 489篇 |
2010年 | 285篇 |
2009年 | 257篇 |
2008年 | 445篇 |
2007年 | 455篇 |
2006年 | 436篇 |
2005年 | 453篇 |
2004年 | 413篇 |
2003年 | 413篇 |
2002年 | 408篇 |
2001年 | 64篇 |
2000年 | 57篇 |
1999年 | 89篇 |
1998年 | 90篇 |
1997年 | 58篇 |
1996年 | 47篇 |
1995年 | 50篇 |
1994年 | 43篇 |
1993年 | 18篇 |
1992年 | 27篇 |
1991年 | 25篇 |
1990年 | 41篇 |
1989年 | 28篇 |
1988年 | 31篇 |
1987年 | 24篇 |
1986年 | 22篇 |
1985年 | 16篇 |
1984年 | 15篇 |
1983年 | 11篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 5篇 |
1975年 | 7篇 |
1973年 | 8篇 |
1971年 | 6篇 |
1959年 | 4篇 |
排序方式: 共有7071条查询结果,搜索用时 15 毫秒
991.
992.
Castaing D Azoulay D Danet C Thoraval L Tanguy Des Deserts C Saliba F Samuel D Adam R 《Gastroentérologie clinique et biologique》2006,30(2):183-187
OBJECTIVES: To assess acceptance and acceptable estimated mortality levels for right lobe adult-to-adult living related liver transplantation for the medical and allied professions. METHODS: A paper questionnaire was sent to the physicians practicing with the French Graft Agency (Etablissement Fran?ais des Greffes) and to all nurses and ancillary staff of the Paul Brousse Hospital Hepatobiliary Center. Responses were received from surgeons: 38/73; internists specialized in hepatology: 44/120; nurses: 98/100; health care assistants: 45/86; others: 17/20. RESULTS: Acceptance of living donor transplantation is above average for all professional categories and indications may be extended including patients with cancer. Acceptable mortality for the donor was 4%, except among internists (0.7%). Currently, the real risk of mortality for the donor (1%) is lower. Acceptable mortality for the recipient was between 15 and 20%. CONCLUSIONS: Acceptance of adult living donor liver transplantation among health care professionals is clearly above average. Thus the psychological involvement of transplantation teams, which is very strong in such situations, should not hamper the development of this type of transplantation. 相似文献
993.
Sprigg N Gray LJ Bath PM Boysen G De Deyn PP Friis P Leys D Marttila R Olsson JE O'Neill D Ringelstein B van der Sande JJ Lindenstrøm E;TAIST Investigators 《Journal of hypertension》2006,24(7):1413-1417
BACKGROUND: A poor outcome after stroke is associated independently with high blood pressure during the acute phase; however, relationships with other haemodynamic measures [heart rate (HR), pulse pressure (PP), rate-pressure product (RPP)] remain less clear. METHODS: The Tinzaparin in Acute Ischaemic Stroke Trial is a randomised, controlled trial assessing the safety and efficacy of tinzaparin versus aspirin in 1484 patients with acute ischaemic stroke. Systolic blood pressure (SBP), diastolic blood pressure (DBP) and HR measurements taken immediately prior to randomization were averaged, and the mid-blood pressure (MBP), PP, mean arterial pressure (MAP), pulse pressure index, and RPP were calculated. The relationship between these haemodynamic measures and functional outcome (death or dependency, modified Rankin Scale > 2) and early recurrent stroke, were studied with adjustment for baseline prognostic factors and treatment group. Odds ratios (OR) and 95% confidence intervals (CI) refer to a change in haemodynamic measure by 10 points. RESULTS: A poor functional outcome was associated with SBP (adjusted OR; 1.11; 95% CI, 1.03-1.21), HR (adjusted OR; 1.15; 95% CI, 1.00-1.31), MBP (adjusted OR; 1.15, 95% CI, 1.03-1.29), PP (adjusted OR; 1.14; 95% CI, 1.02-1.26), MAP (adjusted OR; 1.15; 95% CI, 1.02-1.31) and RPP (adjusted OR; 1.01; 95% CI, 1.00-1.02). Early recurrent stroke was associated with SBP, DBP, MBP and MAP. CONCLUSIONS: A poor outcome is independently associated with elevations in blood pressure, HR and their derived haemodynamic variables, including PP and the RPP. Agents that modify these measures may improve functional outcome after stroke. 相似文献
994.
Experimental and Clinical Radiofrequency Ablation: Proposal for Standardized Description of Coagulation Size and Geometry 总被引:1,自引:1,他引:0
995.
Ferré PJ Liaubet L Concordet D SanCristobal M Uro-Coste E Tosser-Klopp G Bonnet A Toutain PL Hatey F Lefebvre HP 《Pharmaceutical research》2007,24(8):1480-1489
Purpose The purpose of this study is to describe the time course of gene expression in a skeletal muscle local injury induced by an
intramuscular (IM) injection, and to compare the dynamics of gene expression with pathological events.
Materials and Methods Ten piglets received 4 IM injections of propylene glycol in the longissimus dorsi muscles 6 h, 2, 7, and 21 days before euthanasia,
where control and injected muscle sites were sampled for RNA isolation and microscopic examination. The hybridization of nylon
cDNA microarrays was carried out with radioactive probes obtained from the muscle RNA.
Results 153 genes were found under- or over-expressed at least once among the investigated time-conditions. The eight most discriminant
genes were also identified: Two genes (GTP-binding protein RAD and Ankyrin repeat domain protein) were over-expressed at 6 h
and six genes between 2 and 21 days (Osteonectin, Fibronectin, Matrix metalloproteinase-2, Collagen alpha 1(I) chain, Collagen
alpha 2(I) chain, and Thymosin beta-4). Necrosis, inflammation and regeneration were observed through both the dynamics of
gene expression profiles and through the microscopic examinations.
Conclusion Our data demonstrate that several pathways are involved in post-injection muscle injury, and that necrosis, inflammation and
regeneration are not sequential but occur in parallel.
PJF and LL contributed equally to this work and both should be considered as first authors. 相似文献
996.
Bloodstream infections are an important cause of morbidity and mortality in patients. Blood culture is clearly the most important diagnostic procedure for identifying micro-organisms involved in bloodstream infections except when the patient has previously received antibiotics or in the presence of slow-growing or intracellular micro-organisms. Detection of micro-organisms, mainly in blood, using pathogen-specific or broad-range PCR assays is promising. However, it is very important to emphasise that the interpretation of this molecular tool is critical because of the risk of interfering contamination, underlining the necessity to interpret the results obtained with caution. Presently, due to more widely available data and to rapid advances in biotechnology, two significant improvements allow new perspectives for molecular diagnosis. Indeed, the complete sequences of genomes have provided an important source of gene sequences for PCR-based assays. In addition, the development of real-time PCR offers several advantages in comparison to conventional PCR, including speed, simplicity, quantitative capability and low risk of contamination. Herein, we review the usefulness of molecular diagnosis of highly fastidious micro-organisms in the context of three different bloodstream infections: systemic diseases (rickettsiosis, Q fever, bartonellosis, Whipple's disease), blood-culture-negative endocarditis and bioterrorism attack. 相似文献
997.
998.
999.
Bernard S Loffroy R Sérusclat A Boussel L Bonnefoy E Thévenon C Rabilloud M Revel D Moulin P Douek P 《Atherosclerosis》2009,203(2):429-435
1000.
Hyun-Jin Kim Leif C. Andersson Didier Bouton Margaret Warner Jan-ke Gustafsson 《Proceedings of the National Academy of Sciences of the United States of America》2009,106(2):558-563
With specific liver X receptor α and β (LXRα and LXRβ) antibodies, we found that LXRα is strongly expressed in the luminal and basal cells of prostatic epithelium. The ventral prostates (VP) of LXRα−/− mice are characterized by the presence of smooth-muscle actin-positive stromal overgrowth around the prostatic ducts and by numerous fibrous nodules pushing into the ducts and causing obstruction, so that most of the ducts were extremely dilated. BrdU labeling and Ki67 staining revealed epithelial and stromal proliferation in the fibrous nodules. However, the dense stroma surrounding the ducts was not positive for proliferation markers. There was no detectable difference between WT and LXRα−/− mice VP in the expression of the androgen receptor, but there was an increase in nuclear expression of Snail and Smad 2/3, indicating enhanced TGF-β signaling. Upon treatment of WT mice for 3 months with the LXR agonist T2320 or for 3 weeks with β-sitosterol, LXRα was downregulated, and a VP phenotype similar to that of LXRα−/− mice resulted. We conclude that in rodents, LXRα seems to control VP stromal growth and that LXRα−/− mice may be a useful model to study prostatic stromal hyperplasia. Because LXRα is expressed in the epithelium, the excessive stromal growth in LXRα−/− mice indicates that LXRα is essential for epithelial stromal communication. 相似文献