全文获取类型
收费全文 | 5110篇 |
免费 | 343篇 |
国内免费 | 87篇 |
专业分类
耳鼻咽喉 | 106篇 |
儿科学 | 185篇 |
妇产科学 | 97篇 |
基础医学 | 647篇 |
口腔科学 | 201篇 |
临床医学 | 548篇 |
内科学 | 1119篇 |
皮肤病学 | 79篇 |
神经病学 | 485篇 |
特种医学 | 242篇 |
外科学 | 710篇 |
综合类 | 71篇 |
一般理论 | 1篇 |
预防医学 | 307篇 |
眼科学 | 46篇 |
药学 | 239篇 |
中国医学 | 10篇 |
肿瘤学 | 447篇 |
出版年
2023年 | 48篇 |
2022年 | 107篇 |
2021年 | 166篇 |
2020年 | 104篇 |
2019年 | 138篇 |
2018年 | 154篇 |
2017年 | 91篇 |
2016年 | 154篇 |
2015年 | 135篇 |
2014年 | 192篇 |
2013年 | 228篇 |
2012年 | 345篇 |
2011年 | 350篇 |
2010年 | 209篇 |
2009年 | 198篇 |
2008年 | 292篇 |
2007年 | 300篇 |
2006年 | 267篇 |
2005年 | 229篇 |
2004年 | 227篇 |
2003年 | 208篇 |
2002年 | 186篇 |
2001年 | 59篇 |
2000年 | 65篇 |
1999年 | 61篇 |
1998年 | 67篇 |
1997年 | 68篇 |
1996年 | 63篇 |
1995年 | 51篇 |
1994年 | 61篇 |
1993年 | 51篇 |
1992年 | 47篇 |
1991年 | 50篇 |
1990年 | 35篇 |
1989年 | 45篇 |
1988年 | 40篇 |
1987年 | 37篇 |
1986年 | 35篇 |
1985年 | 31篇 |
1984年 | 28篇 |
1983年 | 28篇 |
1982年 | 28篇 |
1981年 | 35篇 |
1980年 | 26篇 |
1979年 | 14篇 |
1978年 | 22篇 |
1977年 | 22篇 |
1976年 | 21篇 |
1975年 | 19篇 |
1972年 | 17篇 |
排序方式: 共有5540条查询结果,搜索用时 15 毫秒
1.
Raphael Mohr Robert Schierwagen Carolynne Schwarze-Zander Christoph Boesecke Jan-Christian Wasmuth Jonel Trebicka Jürgen Kurt Rockstroh 《Medicine》2015,94(50)
Liver-related death in human immunodeficiency virus (HIV)-infected individuals is about 10 times higher compared with the general population, and the prevalence of significant liver fibrosis in those with HIV approaches 15%. The present study aimed to assess risk factors for development of hepatic fibrosis in HIV patients receiving a modern combination anti-retroviral therapy (cART).This cross-sectional prospective study included 432 HIV patients, of which 68 (16%) patients were anti-hepatitis C virus (HCV) positive and 23 (5%) were HBsAg positive.Health trajectory including clinical characteristics and liver fibrosis stage assessed by transient elastography were collected at inclusion. Liver stiffness values >7.1 kPa were considered as significant fibrosis, while values >12.5 kPa were defined as severe fibrosis. Logistic regression and Cox regression uni- and multivariate analyses were performed to identify independent factors associated with liver fibrosis.Significant liver fibrosis was detected in 10% of HIV mono-infected, in 37% of HCV co-infected patients, and in 18% of hepatitis B virus co-infected patients. The presence of diabetes mellitus (odds ratio [OR] = 4.6) and FIB4 score (OR = 2.4) were independently associated with presence of significant fibrosis in the whole cohort. Similarly, diabetes mellitus (OR = 5.4), adiposity (OR = 4.6), and the FIB4 score (OR = 3.3) were independently associated with significant fibrosis in HIV mono-infected patients. Importantly, cumulative cART duration protected, whereas persistent HIV viral replication promoted the development of significant liver fibrosis along the duration of HIV infection.Our findings strongly indicate that besides known risk factors like metabolic disorders, HIV may also have a direct effect on fibrogenesis. Successful cART leading to complete suppression of HIV replication might protect from development of liver fibrosis. 相似文献
2.
F Lofaso F Nicot M Lejaille L Falaize A Louis A Clement J-C Raphael D Orlikowski B Fauroux 《The European respiratory journal》2006,27(5):980-982
Sniff nasal inspiratory pressure (SNIP) measurement is a volitional noninvasive assessment of inspiratory muscle strength. A maximum of 10 sniffs is generally used. The purpose of the present study was to investigate whether the maximum SNIP improved after the tenth sniff. In total, 20 healthy volunteers and 305 patients with various neuromuscular and lung diseases were encouraged to perform 40 and 20 sniffs, respectively. The best SNIP among the first 10 sniffs was lower than the best SNIP among the next 10 sniffs in the healthy volunteers and patients. The SNIP improvement after the twentieth sniff was marginal. In conclusion, a learning effect persists after the tenth sniff. The current authors suggest using 10 additional sniffs when the best result of the first 10 sniffs is slightly below normal, or when sniff nasal inspiratory pressure is used to monitor a progressive decline in inspiratory muscle strength. 相似文献
3.
4.
5.
6.
Thomas A. Luger Harald Gollnick Thomas Schwennesen Raphael Bextermller Siegfried Freytag Matthias Brutigam 《Journal der Deutschen Dermatologischen Gesellschaft》2007,5(10):908-914
Background: Pimecrolimus cream 1% has proven to be well‐tolerated and effective in controlled clinical studies in patients with atopic dermatitis (AD). In a 15‐week patient self‐observation study, safety and efficacy was investigated in the daily practice. Patients and methods: 3502 patients with AD (mean age 26.2 ± 18 years, 62% female) received pimecrolimus cream 1% from 810 physicians in the German Federal Republic.The severity of the disease was assessed at baseline, two times during the 15‐week observation period and at the end of treatment.Patients recorded daily the degree of erythema and pruritus. At the end of treatment, safety and efficacy were assessed by the physician based on patient's daily records and by the patient. Results: The percentage of patients with severe or massive AD decreased from 25% to 7%, whereas the percentage of patients without or with mild symptoms increased from 9% to 55%.The efficacy of treatment was rated by physicians as good or very good in 83.5% of cases and by 79% of patients.At baseline 35% of the patients were free of flares as compared to 75% at the end of therapy. Disease control was better in patients who followed the recommended treatment algorithm for pimecrolimus cream.Tolerability was mostly rated as good or very good. Conclusion: Treatment with pimecrolimus cream 1% for patients with AD is well‐tolerated and effective in daily practice. 相似文献
7.
Evan S. Siegelman Eric K. Outwater Emma E. Furth Raphael Rubin 《Journal of magnetic resonance imaging : JMRI》1995,5(6):730-732
Nodular regenerative hyperplasia (NRH), a rare condition that is commonly associated with noncirrhotic portal hypertension, is not well described in the MR literature. Three patients at two institutions were identified who had both abdominal MR imaging and pathologic evidence of NRH. All examinations were performed at 1.5 T and included axial T1- and T2-weighted spin-echo (SE) images. The MR studies were reviewed by two radiologists in consensus. Two patients had multiple liver lesions that had high signal components on T1-weighted images and were predominantly isointense with liver on the T2-weighted images. One patient had no focal lesions identified. NRH, when visualized on MR images, appears as multifocal masses with shortened Tl and T2 similar to liver. NRH should be considered in the differential diagnosis of hepatocellular tumors, especially in patients with a predisposing condition. 相似文献
8.
Balloon dacryocystoplasty: indications and contraindications 总被引:3,自引:0,他引:3
9.
Alcohol and Platelet Function 总被引:3,自引:0,他引:3
Epidemiological studies have shown that moderate consumption of alcoholic beverages is inversely related to the incidence of the complications of coronary artery disease. The protective effect of ethanol may be partially attributable to an inhibitory effect of ethanol on platelets. This article summarizes the experimental observations that ethanol inhibits platelet responses to specific physiological agonists. In alcoholics, various platelet defects have been observed, but these may be influenced by metabolic factors rather than the presence of ethanol alone. The acute effects of ethanol on platelet functions both in vivo and ex vivo will be reviewed. Evidence will be presented demonstrating that ethanol added acutely in vitro inhibits phospholipase A2 in stimulated platelets. The interaction of ethanol with other signal transduction pathways will also be discussed. 相似文献
10.
Nancy P. Caraway Gregg A. Staerkel Christina V. Fanning Datla G. Varma Raphael E. Pollock 《Diagnostic cytopathology》1994,11(3):255-261
The gross and microscopic appearances of aspirates from ten intramuscular myxomas are reported. The specimens were obtained from seven women and three men, ages 43 to 75, who had tumors involving the muscles of the thigh (7), upper arm (2), and forearm (1). Magnetic resonance (MR) imaging performed in six of the ten cases revealed well-defined, sharply demarcated tumors exhibiting low signal intensity relative to muscle on the T1-weighted images. The tumors were hyperintense to muscle on T2-weighted images. All aspirated tissues were clear, tenacious, and viscous. Smears contained few spindled and histiocytoid cells in an abundant mucoid background. Spindle cells demonstrated long cytoplasmic processes that in areas intertwined to form fibrillar tangles. Nuclei were oval to spindled with fine chromatin and inconspicuous nucleoli. Capillaries were sparse with simple (nonplexiform) branching. The differential diagnosis of myxoid lesions of the extremities includes benign entities such as myxoid schwannoma and neurofibroma, mesenchymal repair, and ganglion cyst, as well as malignant neoplasms such as myxoid liposarcoma, fibrosarcoma, malignant fibrous histiocytoma, and extraskeletal chondrosarcoma. The findings of this study revealed that, although the cytologic features were suggestive of intramuscular myxoma, a definitive diagnosis was often difficult, owing to scant cellularity and lack of distinctive cytologic features. The MR imaging findings may be utilized as an adjunct to the cytologic features to more confidently suggest a diagnosis of intramuscular myxoma. Diagn Cytopathol 1994;11:255–261. © 1994 Wiley-Liss, Inc. 相似文献