全文获取类型
收费全文 | 1399篇 |
免费 | 58篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 31篇 |
妇产科学 | 33篇 |
基础医学 | 100篇 |
口腔科学 | 51篇 |
临床医学 | 84篇 |
内科学 | 452篇 |
皮肤病学 | 23篇 |
神经病学 | 128篇 |
特种医学 | 43篇 |
外科学 | 183篇 |
综合类 | 1篇 |
预防医学 | 59篇 |
眼科学 | 5篇 |
药学 | 90篇 |
肿瘤学 | 182篇 |
出版年
2023年 | 15篇 |
2022年 | 12篇 |
2021年 | 25篇 |
2020年 | 17篇 |
2019年 | 25篇 |
2018年 | 48篇 |
2017年 | 27篇 |
2016年 | 44篇 |
2015年 | 36篇 |
2014年 | 62篇 |
2013年 | 82篇 |
2012年 | 107篇 |
2011年 | 99篇 |
2010年 | 63篇 |
2009年 | 68篇 |
2008年 | 87篇 |
2007年 | 87篇 |
2006年 | 90篇 |
2005年 | 88篇 |
2004年 | 61篇 |
2003年 | 68篇 |
2002年 | 60篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 12篇 |
1998年 | 12篇 |
1997年 | 7篇 |
1996年 | 13篇 |
1995年 | 7篇 |
1994年 | 12篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1978年 | 5篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1969年 | 2篇 |
1967年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1469条查询结果,搜索用时 15 毫秒
101.
Melioli G Semino C Margarino G Mereu P Scala M Cangemi G Crocetti E Machì AM Ferlazzo G 《Head & neck》2003,25(4):297-305
BACKGROUND: In a group of patients with head and neck cancers (H&NC), the expansion of the population of CD3-,CD16+ natural killer (NK) cells in the peripheral blood was studied. METHODS: Cytofluorimetric analysis of the expression of killer Ig-like receptors (KIR, namely p58.1, p58.2, p58.3, p70, and p140) and CD94-NKG2a was performed. Cytolytic activities were studied using 51Cr release assay. T and NK cell cloning was performed using limiting dilution culture conditions. Cytokine production was analyzed using commercial enzyme immunoassays. RESULTS: Phenotypic analysis showed that the expanded populations were heterogeneous. Even in the presence of a large number of circulating NK cells, "nonspecific" cytolytic capacities were heavily reduced, whereas cytolytic capacity related to T cells was virtually normal. Unlike NK cell clones derived from healthy donors, most NK cells derived from H&NC patients expressed surface "activating" NK cell receptors (KAR) for HLA, detected by use of a redirected cytolytic assay. Analysis of the CD4+ subpopulation at the clonal level demonstrated that they had a severe proliferative defect. CONCLUSION: These experimental data indicated that H&NC patients have a polyclonal expansion of functionally deficient NK cells expressing KAR. In addition, the proliferative capacity of patients' "helper" cells was strongly inhibited, thus accounting for a severe impairment of cytolytic activity of the expanded NK cells. 相似文献
102.
103.
Fabio Galetta Ferdinando Franzoni Giampaolo Bernini Fallawi Poupak Angelo Carpi Giuseppe Cini Leonardo Tocchini Alessandro Antonelli Gino Santoro 《Biomedicine & Pharmacotherapy》2010
Phaeochromocytomas are rare neuroendocrine tumours secreting high levels of catecholamines, able to exert serious metabolic and cardiovascular effects. The serious and potentially lethal cardiovascular complications of these tumours are due to the potent effects of secreted catecholamines, especially noradrenaline, the main transmitter released from sympathetic nerve terminals. Hypertension, tachycardia, pallor, headache and anxiety, usually dominate the clinical presentation. Occasionally, patients with predominantly epinephrine-secreting tumours present hypotension or even shock. Other cardiovascular complications of pheochromocytoma include ischaemic heart disease, acute myocardial infarction, cardiac arrhythmias, heart failure due to toxic cardiomyopathy, or pulmonary edema. Catecholamines have been shown to influence the extracellular matrix with collagen deposition and subsequent fibrosis in the arterial wall and in the myocardium. These morphofunctional changes of the myocardium and of arterial wall can be emphasized by ultrasound imaging. Indeed, ultrasound imaging of the myocardium and arterial wall not only identifies wall thickness but also contains information on texture that may be revealed by acoustic tissue characterization. The latter can be quantified through videodensitometric analysis of echographic images or through ultrasonic integrated backscatter signal analysis. This paper reviews cardiovascular complications in patients with pheochromocytoma and utility of the new ultrasound technique as backscatter signal. It is useful for evaluating preclinical pathological morphofunctional changes of the myocardium and arterial wall, characterized by increased collagen content in pheochromocytoma patients. The recognition of early catecholamine-induced alterations in patients with pheochromocytoma, is important to prevent at least morbidity and mortality, before surgical treatment. 相似文献
104.
105.
106.
Francesco Schettini Domenico De Mattia Giampaolo Arcamone Vincenzo Sabato Maria Altomare Maria Gabriella Burattini Francesco Fedele Angelo Compagnone Giovanni Ciavarella 《Pediatric hematology and oncology》1987,4(3):231-236
Selected hemostatic parameters of 23 children affected by β-thalassemia major were studied and compared to an age- and sex-matched group. Plasma prekallikrein level was reduced in all patients, splenectomized or not. In splenectomized patients, platelet count and in vitro platelet aggregability were significantly increased and Protein C was slightly increased. The activated partial thromboplastin time was prolonged and the normotest reduced. Finally, a reduction in the plasma levels of fibrinogen and of vitamin K-dependent proteins, including the antithrom-botic Protein C, was observed in nonsplenectomized patients. Our data indicate that the hemostatic system in patients with thalassemia major may be altered. The relationship between these laboratory changes and clinical manifestations remains to be established. 相似文献
107.
Andrea Minervini Riccardo Campi Fabrizio Di Maida Andrea Mari Ilaria Montagnani Riccardo Tellini Agostino Tuccio Giampaolo Siena Gianni Vittori Alberto Lapini Maria Rosaria Raspollini Marco Carini 《Urologic oncology》2018,36(12):527.e1-527.e11
Objective
Tumor enucleation has been shown to be oncologically safe for elective treatment of renal cell carcinoma (RCC); yet, evidence on long-term oncologic outcomes after robotic tumor enucleation is lacking.In this study we provide a detailed histopathological analysis of tumor–parenchyma interface and the long-term oncologic outcomes after robotic tumor enucleation for sporadic RCC in a high-volume referral center.Materials and Methods
We selected consecutive patients undergoing robotic tumor enucleation for sporadic RCC by experienced surgeons with at least 4 years of follow-up.Pattern of pseudocapsule (PC) invasion, thickness of healthy renal margin removed with the tumor, margin status and recurrence rate were the main study endpoints. Multivariable models evaluated independent predictors of PC invasion.Results
Overall, 140 patients were eligible for the study. Of these, 127 (91%) had complete data available for analysis. Median thickness of healthy renal margin was 0.57 mm (interquartile range [IQR] 0.24–103).A distinct peritumoral PC was present in 121/127 (95%) tumors with a median thickness of 0.28 mm (IQR 0.14–0.45).In 24/121 (19.8%) cases, RCC showed complete PC invasion. At multivariable analysis, increasing tumor diameter, endophytic rate > 50% and papillary histology were significantly associated with complete PC invasion.Positive surgical margins were reported in 3/127 (2.4%) cases. At a median follow-up of 61 months (range 48–76), one patient died due to metastatic RCC. Among patients alive at follow-up, no cases of recurrence at the enucleation site were recorded, while three cases (2.4%) of renal recurrence (elsewhere in the ipsilateral kidney) and three cases (2.4%) of systemic recurrence were found.Conclusions
Distinct RCC-related features were associated with complete PC invasion. By providing a microscopic layer of healthy renal margin in almost all cases, robotic tumor enucleation achieved negative surgical margins in the vast majority of patients, even in case of complete PC invasion. At long-term follow-up, no recurrences were found at the enucleation site. Although our findings need to be confirmed by larger studies with longer follow-up, robotic tumor enucleation appears oncologically safe in experienced hands for the treatment of sporadic RCC. 相似文献108.
109.