全文获取类型
收费全文 | 1275155篇 |
免费 | 94146篇 |
国内免费 | 1984篇 |
专业分类
耳鼻咽喉 | 18185篇 |
儿科学 | 42279篇 |
妇产科学 | 37812篇 |
基础医学 | 186987篇 |
口腔科学 | 35380篇 |
临床医学 | 108106篇 |
内科学 | 251447篇 |
皮肤病学 | 26497篇 |
神经病学 | 99170篇 |
特种医学 | 49981篇 |
外国民族医学 | 366篇 |
外科学 | 197581篇 |
综合类 | 26513篇 |
现状与发展 | 1篇 |
一般理论 | 300篇 |
预防医学 | 92581篇 |
眼科学 | 29056篇 |
药学 | 97755篇 |
1篇 | |
中国医学 | 2496篇 |
肿瘤学 | 68791篇 |
出版年
2018年 | 11808篇 |
2015年 | 11611篇 |
2014年 | 15999篇 |
2013年 | 24345篇 |
2012年 | 33542篇 |
2011年 | 35938篇 |
2010年 | 21207篇 |
2009年 | 20013篇 |
2008年 | 34978篇 |
2007年 | 37941篇 |
2006年 | 38503篇 |
2005年 | 37796篇 |
2004年 | 36379篇 |
2003年 | 35369篇 |
2002年 | 34918篇 |
2001年 | 58093篇 |
2000年 | 59583篇 |
1999年 | 50687篇 |
1998年 | 14234篇 |
1997年 | 12810篇 |
1996年 | 13072篇 |
1995年 | 12345篇 |
1994年 | 11758篇 |
1993年 | 10860篇 |
1992年 | 40985篇 |
1991年 | 40358篇 |
1990年 | 39885篇 |
1989年 | 38706篇 |
1988年 | 36108篇 |
1987年 | 35349篇 |
1986年 | 33723篇 |
1985年 | 32134篇 |
1984年 | 23922篇 |
1983年 | 20818篇 |
1982年 | 12377篇 |
1981年 | 10928篇 |
1980年 | 10204篇 |
1979年 | 22635篇 |
1978年 | 15877篇 |
1977年 | 13729篇 |
1976年 | 12970篇 |
1975年 | 14202篇 |
1974年 | 16682篇 |
1973年 | 16076篇 |
1972年 | 15318篇 |
1971年 | 14229篇 |
1970年 | 13214篇 |
1969年 | 12731篇 |
1968年 | 11978篇 |
1967年 | 10478篇 |
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
41.
42.
Changhyun Kim B.S. Brittany G. Craiglow M.D. Kalman L. Watsky M.D. Richard J. Antaya M.D. 《Pediatric dermatology》2015,32(4):e161-e162
A 17‐year‐old boy presented with recurring severe dermatitis of the face of 5‐months duration that resembled impetigo. He had been treated with several courses of antibiotics without improvement. Biopsy showed changes consistent with allergic contact dermatitis and patch testing later revealed sensitization to benzoyl peroxide, which the patient had been using for the treatment of acne vulgaris. 相似文献
43.
F. Fruzzetti G. Palla A. Sbrana T. Simoncini M. R. Sessa 《Gynecological endocrinology》2020,36(10):938-940
AbstractObjective: To understand the origin of extremely high gonadotropin levels in a perimenopausal woman.Methods: A 52-year-old woman with a 2?months of amenorrhea followed spontaneous menstrual cycles recovery was referred to our outpatient clinic with elevated follicle-stimulating hormone (FSH, 483 mUI/ml), luteinizing hormone (LH, 475 mUI/ml) and prolactin (PRL, 173?ng/ml). She was known to take levosulpiride. The gonadotropin levels did not fit with the clinical features.Results: A gonadotroph tumor was ruled out. Further analysis confirmed constantly high FSH, LH and PRL levels. The measurements were repeated using different analytical platforms with different results. After serial dilutions, nonlinearity was present suggesting an immunoassay interference. After post-polyethylene glycol recovery, hormone levels appeared in the normal range. Anti-goat antibodies were recognized in the serum of the patient.Conclusions: This case report shows a case of falsely abnormal high gonadotropin and PRL levels in a woman during menopause transition. In the clinical practice the evaluation of gonadotropin profile is not recommended at this age, but the abnormal levels stimulated further evaluation. An interference in the assay due to anti-goat antibodies resulted in abnormally high level of FSH and LH. A strict collaboration between clinicians and the laboratory is needed, when laboratory findings do not correspond to clinical findings. 相似文献
44.
45.
T. Wu L. G. Trahair M. J. Bound C. F. Deacon M. Horowitz C. K. Rayner K. L. Jones 《Diabetic medicine》2015,32(5):595-600
46.
47.
48.
49.
Marcel Toussaint Raymond J. Gilles Noura Azzabou Benjamin Marty Alexandre Vignaud Andreas Greiser Pierre G. Carlier 《Medicine》2015,94(43)
Delayed contrast enhancement after injection of a gadolinium-chelate (Gd-chelate) is a reference imaging method to detect myocardial tissue changes. Its localization within the thickness of the myocardial wall allows differentiating various pathological processes such as myocardial infarction (MI), inflammatory myocarditis, and cardiomyopathies. The aim of the study was first to characterize benign myocarditis using quantitative delayed-enhancement imaging and then to investigate whether the measure of the extracellular volume fraction (ECV) can be used to discriminate between MI and myocarditis.In 6 patients with acute benign myocarditis (32.2 ± 13.8 year-old, subepicardial late gadolinium enhancement [LGE]) and 18 patients with MI (52.3 ± 10.9 year-old, subendocardial/transmural LGE), myocardial T1 was determined using the Modified Look-Locker Imaging (MOLLI) sequence at 3 Tesla before and after Gd-chelate injection. T1 values were compared in LGE and normal regions of the myocardium. The myocardial T1 values were normalized to the T1 of blood, and the ECV was calculated from T1 values of myocardium and blood pre- and post-Gd injection.In both myocarditis and MI, the T1 was lower in LGE regions than in normal regions of the left ventricle. T1 of LGE areas was significantly higher in myocarditis than in MI (446.8 ± 45.8 vs 360.5 ± 66.9 ms, P = 0.003) and ECV was lower in myocarditis than in MI (34.5 ± 3.3 vs 53.8 ± 13.0 %, P = 0.004).Both inflammatory process and chronic fibrosis induce LGE (subepicardial in myocarditis and subendocardial in MI). The present study demonstrates that the determination of T1 and ECV is able to differentiate the 2 histological patterns.Further investigation will indicate whether the severity of ECV changes might help refine the predictive risk of LGE in myocarditis. 相似文献
50.