全文获取类型
收费全文 | 80061篇 |
免费 | 3827篇 |
国内免费 | 326篇 |
专业分类
耳鼻咽喉 | 1036篇 |
儿科学 | 2146篇 |
妇产科学 | 1985篇 |
基础医学 | 10590篇 |
口腔科学 | 2957篇 |
临床医学 | 5811篇 |
内科学 | 19708篇 |
皮肤病学 | 1653篇 |
神经病学 | 6841篇 |
特种医学 | 2439篇 |
外国民族医学 | 6篇 |
外科学 | 9484篇 |
综合类 | 425篇 |
一般理论 | 28篇 |
预防医学 | 8412篇 |
眼科学 | 1306篇 |
药学 | 5347篇 |
中国医学 | 303篇 |
肿瘤学 | 3737篇 |
出版年
2023年 | 541篇 |
2022年 | 1006篇 |
2021年 | 2189篇 |
2020年 | 1171篇 |
2019年 | 1875篇 |
2018年 | 3917篇 |
2017年 | 2400篇 |
2016年 | 1791篇 |
2015年 | 1897篇 |
2014年 | 2616篇 |
2013年 | 3470篇 |
2012年 | 5325篇 |
2011年 | 5670篇 |
2010年 | 3053篇 |
2009年 | 2547篇 |
2008年 | 4568篇 |
2007年 | 4706篇 |
2006年 | 4356篇 |
2005年 | 4361篇 |
2004年 | 3963篇 |
2003年 | 3708篇 |
2002年 | 3467篇 |
2001年 | 1845篇 |
2000年 | 1958篇 |
1999年 | 1597篇 |
1998年 | 586篇 |
1997年 | 386篇 |
1996年 | 376篇 |
1995年 | 328篇 |
1994年 | 270篇 |
1993年 | 277篇 |
1992年 | 811篇 |
1991年 | 641篇 |
1990年 | 615篇 |
1989年 | 529篇 |
1988年 | 471篇 |
1987年 | 495篇 |
1986年 | 426篇 |
1985年 | 374篇 |
1984年 | 277篇 |
1983年 | 239篇 |
1979年 | 199篇 |
1978年 | 173篇 |
1977年 | 150篇 |
1975年 | 176篇 |
1974年 | 181篇 |
1973年 | 170篇 |
1972年 | 168篇 |
1971年 | 163篇 |
1968年 | 150篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Duds Eszter Susa va Pamjav Horolma Szabolcsi Zoltn 《International journal of legal medicine》2020,134(2):487-489
International Journal of Legal Medicine - Gyula Ágner was a Royal Hungarian First Lieutenant (1st Lt.) during the World War II and died at 30 years old due to a mine shrapnel injury... 相似文献
42.
I García-Rubio C Martínez-Cócera T Robledo Echarren S Vázquez Cortés 《Journal of investigational allergology & clinical immunology》2006,16(4):264-265
Eye drops contain several ophthalmic medications which can produce allergic reactions. We report the case of a patient with contact dermatitis from neomycin and a probable fixed exanthema after parenteral administration of tobramycin who tolerated topical tobramycin and other aminoglycosides. 相似文献
43.
44.
45.
46.
47.
Aureli Torné Alfonso Alba Xavier Castellsagué Javier Cortés 《Progresos de Obstetricia y Ginecología》2006
Persistent infection by human papilloma virus (HPV) is considered to be the main cause of cervical cancer and other ano-genital cancers. Of more than 30 genotypes able to infect the anogenital tract, it is estimated that, worldwide, HPV 16 and 18 cause 70% of cervical cancers and that HPV 6 and 11 cause more than 90% of genital warts. In the last few years, the morbidity and mortality and health costs associated with cervical cancer and its precursor lesions have stimulated intense research activity to achieve primary prevention of this disease through prophylactic vaccines. 相似文献
48.
Jesús Hermida J Antonio Casal J Carlos Tutor 《Clinical chemistry and laboratory medicine》2003,41(3):302-305
Using 3,3'-diclorophenolsulfoftaleinil N-acetyl-beta-D-glucosaminide as a substrate, the apparent activation energy of beta-N-acetylhexosaminidase (Hex) was determined in samples of plasma and urine, as well as in leukocyte and platelet lysates. Incubation with papain produced an increase in this thermodynamic variable for plasma Hex (precursor forms with high molecular mass) that would be caused by the proteolytic action of papain on the Hex A isoenzyme. However, digestion with papain did not significantly modify the activation energy of Hex in leukocyte and platelet lysates (mature enzymatic forms). In 11 healthy subjects and 28 patients with different renal diseases, no statistically significant differences were found with regard to the values obtained in cellular lysates for variations in the activation energy of urinary Hex, regardless of whether they presented normoalbuminuria, microalbuminuria or macroalbuminuria. These results support the hypothesis that even in patients with proteinuria, no significant amounts of plasma Hex precursor forms are found in urine samples, and the source of the enzyme activity is the kidney itself. 相似文献
49.
50.
Mariela Dutra Gontijo Moura Soraya de Mattos Camargo Grossmann Linaena Méricy da Silva Fonseca Maria Inês Barreiros Senna Ricardo Alves Mesquita 《Journal of oral pathology & medicine》2006,35(6):321-326
BACKGROUND: Oral hairy leukoplakia (OHL) may be an indicator of the progression of Human Immunodeficiency Virus (HIV)-induced immuno-depression, and the evaluation of risk factors leading to OHL is important in the management of these HIV-infected patients. However, there are few studies that analyze risk factors leading to OHL in the Brazilian population. The aim of this case-control study is to present data about prevalence rates and risk factors leading to OHL in a sample of HIV-infected adults in Brazil. METHODS: This case-control study included 111 HIV-infected patients treated at a clinic for sexually transmitted diseases and HIV. In the initial examinations with dentists, variables were collected from all patients. Diagnosis of OHL was performed in accordance with the International Classification System and cytological features. The Fisher and the chi-squared tests were used for statistical analysis. The proportional prevalence and odds ratio were estimated. RESULTS: Outcome presented a positive, statistically significant association among the presence of OHL and viral load of 3000 copies/mul or greater (P = 0.0001; odds ratio (OR) = 5.8), presence of oral candidiasis (P = 0.0000; OR = 11.1), previous use of fluconazole (P = 0.0000; OR = 24.6), and use of systemic acyclovir (P = 0.032; OR = 4.3). Antiretroviral medication presented a negative, statistically significant association with the presence of OHL (P = 0.002; OR = 8.4). CONCLUSIONS: Prevalence of OHL was 28.8%. Viral load, oral candidiasis, previous use of fluconazole, and systemic acyclovir were determined to be risk factors for OHL. Antiretroviral medication proved to be protective against the development of OHL. 相似文献