全文获取类型
收费全文 | 49233篇 |
免费 | 3205篇 |
国内免费 | 188篇 |
专业分类
耳鼻咽喉 | 524篇 |
儿科学 | 1237篇 |
妇产科学 | 865篇 |
基础医学 | 6445篇 |
口腔科学 | 1252篇 |
临床医学 | 4760篇 |
内科学 | 9999篇 |
皮肤病学 | 754篇 |
神经病学 | 4861篇 |
特种医学 | 2556篇 |
外国民族医学 | 6篇 |
外科学 | 7249篇 |
综合类 | 592篇 |
一般理论 | 40篇 |
预防医学 | 4049篇 |
眼科学 | 1199篇 |
药学 | 2941篇 |
中国医学 | 69篇 |
肿瘤学 | 3228篇 |
出版年
2023年 | 208篇 |
2022年 | 349篇 |
2021年 | 809篇 |
2020年 | 614篇 |
2019年 | 812篇 |
2018年 | 955篇 |
2017年 | 778篇 |
2016年 | 921篇 |
2015年 | 1066篇 |
2014年 | 1495篇 |
2013年 | 2074篇 |
2012年 | 3130篇 |
2011年 | 3328篇 |
2010年 | 1891篇 |
2009年 | 1719篇 |
2008年 | 3076篇 |
2007年 | 3169篇 |
2006年 | 3117篇 |
2005年 | 3049篇 |
2004年 | 2849篇 |
2003年 | 2767篇 |
2002年 | 2660篇 |
2001年 | 619篇 |
2000年 | 573篇 |
1999年 | 637篇 |
1998年 | 602篇 |
1997年 | 469篇 |
1996年 | 422篇 |
1995年 | 402篇 |
1994年 | 322篇 |
1993年 | 294篇 |
1992年 | 370篇 |
1991年 | 338篇 |
1990年 | 308篇 |
1989年 | 326篇 |
1988年 | 292篇 |
1987年 | 308篇 |
1986年 | 279篇 |
1985年 | 301篇 |
1984年 | 305篇 |
1983年 | 292篇 |
1982年 | 319篇 |
1981年 | 297篇 |
1980年 | 263篇 |
1979年 | 225篇 |
1978年 | 233篇 |
1977年 | 196篇 |
1976年 | 168篇 |
1975年 | 177篇 |
1974年 | 184篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
6.
Oral Everolimus for Treatment of a Giant Left Ventricular Rhabdomyoma in a Neonate—Rapid Tumor Regression Documented by Real Time 3D Echocardiography 下载免费PDF全文
Robert Wagner M.D. Ph.D. Frank Thomas Riede M.D. Hiroshi Seki M.D. Frauke Hornemann M.D. Steffen Syrbe M.D. Ingo Daehnert M.D. Ph.D. Michael Weidenbach M.D. Ph.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(12):1876-1879
The presented case reports on successful treatment with everolimus in a neonate with left ventricular giant rhabdomyoma. The authors used a different dosage regime compared to literature and documented rapid tumor regression by 3D echocardiography. 相似文献
7.
Steven V Koenen Anjoke J M Huisjes Jules Dings Yolanda van der Graaf Gerard H A Visser Hein W Bruinse 《The journal of maternal-fetal & neonatal medicine》2006,19(2):93-99
OBJECTIVE: To determine if there is a diurnal pattern in the clinical symptoms of HELLP (Hemolysis, Elevated Liver enzymes, Low Platelets) syndrome. STUDY DESIGN: A retrospective study was performed in 134 pregnancies complicated by HELLP syndrome. The medical records were reviewed to describe each HELLP episode. Time of day was divided into three periods, day, evening, and night. The following parameters were categorized according to the time of day: onset of symptoms, consultation by the doctor, initial blood sampling, diagnosis and decrease of symptoms. Biochemical parameters at clinical presentation and consecutive changes within 24 h were recorded. RESULTS: In 65 pregnancies 77 HELLP episodes were well documented. Times of onset of symptoms and consultation by the doctor were significantly higher during the evening and night (p < 0.001), whereas times of diagnosis and decrease of symptoms occurred significantly more during the day (p < 0.001). In only 49.3% of the cases were diagnostic laboratory criteria met at clinical presentation. This was mainly due to platelet values in excess of 100 x 10(9)/l. Several hours later (median 8 h, range 2-23) the decrease in platelets occurred. CONCLUSIONS: A diurnal pattern exists in the clinical symptoms of HELLP syndrome that is characterized by an exacerbation during the night and recovery during the day. There is a considerable delay between the onset of symptoms and the fulfillment of diagnostic laboratory criteria. 相似文献
8.
9.
Genomes of some parasites contain dozens of alternative and highly diverged surface antigens, of which only a single one is expressed in any cell. Individual cells occasionally change expression of their surface antigen, allowing them to escape immune surveillance. These switches appear to occur in a partly random way, creating a diverse set of antigenic variants. In spite of this diversity, the parasitemia develops as a series of outbreaks, in which each outbreak is dominated by relatively few antigenic types. Host-specific immunity eventually clears the dominant antigenic types, and a new outbreak follows from antigenic types that have apparently been present all along at low frequency. This pattern of sequential dominance by different antigenic types remains unexplained. We review the five most prominent theories, which have developed mainly from studies of the protozoans Trypanosoma and Plasmodium, and the bacterial spirochete Borrelia. The most promising theories depend on some combination of mechanisms to create favored connectivity pathways through the matrix of transitions between variants. Favored pathways may arise from biased switches at the molecular level of gene expression or from biases imposed by immune selection. We illustrate the concept of connectivity pathways by reanalysis of data on transitions between variants from Borrelia hermsii. 相似文献
10.