全文获取类型
收费全文 | 1482999篇 |
免费 | 107631篇 |
国内免费 | 2450篇 |
专业分类
耳鼻咽喉 | 20783篇 |
儿科学 | 50128篇 |
妇产科学 | 39397篇 |
基础医学 | 212100篇 |
口腔科学 | 39481篇 |
临床医学 | 128408篇 |
内科学 | 301793篇 |
皮肤病学 | 33397篇 |
神经病学 | 118836篇 |
特种医学 | 56857篇 |
外国民族医学 | 715篇 |
外科学 | 220640篇 |
综合类 | 27919篇 |
现状与发展 | 1篇 |
一般理论 | 446篇 |
预防医学 | 114952篇 |
眼科学 | 31726篇 |
药学 | 109641篇 |
2篇 | |
中国医学 | 3115篇 |
肿瘤学 | 82743篇 |
出版年
2021年 | 11989篇 |
2019年 | 13130篇 |
2018年 | 20089篇 |
2017年 | 14601篇 |
2016年 | 15558篇 |
2015年 | 17707篇 |
2014年 | 23024篇 |
2013年 | 35092篇 |
2012年 | 51357篇 |
2011年 | 53477篇 |
2010年 | 30359篇 |
2009年 | 27598篇 |
2008年 | 49381篇 |
2007年 | 52857篇 |
2006年 | 51770篇 |
2005年 | 50412篇 |
2004年 | 48693篇 |
2003年 | 46520篇 |
2002年 | 45175篇 |
2001年 | 67474篇 |
2000年 | 69969篇 |
1999年 | 59580篇 |
1998年 | 15869篇 |
1997年 | 14382篇 |
1996年 | 14756篇 |
1995年 | 13948篇 |
1994年 | 13224篇 |
1993年 | 12185篇 |
1992年 | 46569篇 |
1991年 | 45312篇 |
1990年 | 43938篇 |
1989年 | 41682篇 |
1988年 | 38423篇 |
1987年 | 37635篇 |
1986年 | 34941篇 |
1985年 | 33509篇 |
1984年 | 25072篇 |
1983年 | 21079篇 |
1982年 | 12232篇 |
1981年 | 11076篇 |
1979年 | 22170篇 |
1978年 | 15417篇 |
1977年 | 13074篇 |
1976年 | 12137篇 |
1975年 | 13213篇 |
1974年 | 15383篇 |
1973年 | 14844篇 |
1972年 | 13606篇 |
1971年 | 12340篇 |
1970年 | 11631篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
53.
54.
Iva Justini Ana Kati Deni Uri
i Boena urko‐Cofek Branka Blagovi Gordana anadi Jurei 《Environmental toxicology》2020,35(3):346-358
The yeast Saccharomyces cerevisiae is a useful model for studying the influence of different stress factors on eukaryotic cells. In this work we used the pesticide imidacloprid, in the Confidor formulation, as the stress factor and analyzed its influence on the metabolic activity, proteome and lipid content and composition of Saccharomyces cerevisiae yeast. During the cultivation of yeast, the lowest recommended application dose of Confidor (0.025%, v/v) was added to the growth media and its influence on the mitochondria, cytosol with microsomes, and the whole yeast cells was monitored. The results show that under the stress provoked by the toxic effects of Confidor, yeast cells density significantly decreased and the percentage of metabolically disturbed cells significantly increased comparing with untreated control. Also, there was a downregulation of majority of glycolytic, gluconeogenesis, and TCA cycle enzymes (Fba1, Adh1, Hxk2, Tal1, Tdh1,Tdh3, Eno1) thus providing enough acetyl‐CoA for the lipid restructuring and accumulation mechanism since we have found the changes in the cell and mitochondrial lipid content and FA composition. This data suggest that lipids could be the molecules that orchestrate the answer of the cells in the stress response to the Confidor treatment. 相似文献
55.
56.
57.
Marta Rozanski Valentin Neuhaus Emily Thornton Stéphanie J. E. Becker James P. Rathmell David Ring 《Journal of hand and microsurgery》2015,7(1):30-35
This study used the National Survey of Ambulatory Surgery (NSAS) database to measure the incidence of and risk factors for symptoms in the ambulatory surgery center and problems within 24 h after isolated carpal tunnel release (CTR). The NSAS contained records on 400,000 adult patients with carpal tunnel syndrome who were treated with CTR in 2006, based on ICD-9 codes. The type of anesthesia used and factors associated with symptoms and problems were sought in bivariate and multivariable statistical analyses. The mean duration of the procedure was 16 ± 8.8 min. Only 5 % were performed under local anesthesia without sedation, 45 % with IV sedation, 28 % regional anesthesia, and 19 % general anesthesia. Symptoms in the ambulatory surgery center or a problem within 24 h after discharge were recorded in 10 % of patients, all of them minor and transient, including difficulties with pain and its treatment. The strongest risk factors were male sex, age of 45 years and older, and participation of an anesthesiologist. Local anesthesia and regional anesthesia were associated with more perioperative symptoms and postoperative problems. Most CTR are performed with some sedation in the United States. CTR is a safe procedure: one in 10 patients will experience a minor issue in the perioperative or immediate postoperative period. 相似文献
58.
59.
Francisca Morgado Mariana Batista Ana Moreno Inês Coutinho 《Pediatric dermatology》2021,38(1):191-193
We present a 6‐year‐old girl with skin hyperpigmentation, leukoplakia, and onychodystrophy, the classic mucocutaneous triad usually associated with dyskeratosis congenita. The patient also had premature graying of the hair, bone marrow failure, hepatitis, exudative retinopathy, osteopenia with multiple long bone fractures, and intracranial calcifications and brain cysts. Coats plus syndrome is a rare disease with a clinical and genetic overlap with dyskeratosis congenita. This disease is reviewed, with a focus on the pathogenesis of the genetic anomalies and its background as a telomere biology disorder. 相似文献