全文获取类型
收费全文 | 24020篇 |
免费 | 1296篇 |
国内免费 | 112篇 |
专业分类
耳鼻咽喉 | 393篇 |
儿科学 | 461篇 |
妇产科学 | 472篇 |
基础医学 | 3195篇 |
口腔科学 | 2546篇 |
临床医学 | 1576篇 |
内科学 | 5346篇 |
皮肤病学 | 442篇 |
神经病学 | 1941篇 |
特种医学 | 523篇 |
外科学 | 3137篇 |
综合类 | 90篇 |
一般理论 | 8篇 |
预防医学 | 2213篇 |
眼科学 | 500篇 |
药学 | 1412篇 |
中国医学 | 204篇 |
肿瘤学 | 969篇 |
出版年
2023年 | 180篇 |
2022年 | 413篇 |
2021年 | 903篇 |
2020年 | 573篇 |
2019年 | 703篇 |
2018年 | 858篇 |
2017年 | 523篇 |
2016年 | 611篇 |
2015年 | 838篇 |
2014年 | 1170篇 |
2013年 | 1310篇 |
2012年 | 1922篇 |
2011年 | 2280篇 |
2010年 | 1137篇 |
2009年 | 958篇 |
2008年 | 1686篇 |
2007年 | 1658篇 |
2006年 | 1486篇 |
2005年 | 1307篇 |
2004年 | 1113篇 |
2003年 | 953篇 |
2002年 | 819篇 |
2001年 | 257篇 |
2000年 | 229篇 |
1999年 | 185篇 |
1998年 | 111篇 |
1997年 | 90篇 |
1996年 | 74篇 |
1995年 | 56篇 |
1994年 | 47篇 |
1993年 | 45篇 |
1992年 | 85篇 |
1991年 | 97篇 |
1990年 | 70篇 |
1989年 | 63篇 |
1988年 | 45篇 |
1987年 | 56篇 |
1986年 | 48篇 |
1985年 | 52篇 |
1984年 | 44篇 |
1983年 | 45篇 |
1982年 | 26篇 |
1981年 | 21篇 |
1980年 | 25篇 |
1979年 | 25篇 |
1978年 | 19篇 |
1977年 | 18篇 |
1973年 | 18篇 |
1970年 | 18篇 |
1966年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
Dalton Luiz Schiessel Ricardo K. Yamazaki Marcelo Kryczyk Isabela Coelho de Castro Adriana A. Yamaguchi Danielle C. T. Pequito 《Nutrition and cancer》2016,68(8):1369-1380
Objective: Polyunsaturated fatty acids n-3 (PUFA n-3) have shown effects in reducing tumor growth, in particular eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) abundantly present in fish oil (FO). When these fatty acids are provided in the diet, they alter the functions of the cells, particularly in tumor and immune cells. However, the effects of α-linolenic fatty acid (ALA), which is the precursor of EPA and DHA, are controversial. Thus, our objective was to test the effect of this parental fatty acid. Methods: Non-tumor-bearing and tumor-bearing Wistar rats (70 days) were supplemented with 1 g/kg body weight of FO or Oro Inca® (OI) oil (rich in ALA). Immune cells function, proliferation, cytokine production, and subpopulation profile were evaluated. Results: We have shown that innate immune cells enhanced phagocytosis capacity, and increased processing and elimination of antigens. Moreover, there was a decrease in production of pro-inflammatory cytokines (tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6)) by macrophages. Lymphocytes showed decreased proliferation capacity, increased cluster of differentiation 8 (CD8+) subpopulation, and increased TNF-α production. Conclusions: Oil rich in ALA caused similar immune modulation in cancer when compared with FO. 相似文献
5.
6.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98
7.
Die Anaesthesiologie - Simulationstraining ist für die Notfallmedizin unverzichtbar, insbesondere in Hinsicht auf eine verbesserte Patientensicherheit. Methoden und Technologien umfassen ein... 相似文献
8.
9.
10.
Talita da Silva Mendes de Farias Ariclécio Cunha de Oliveira Sandra Andreotti Fernanda Gaspar do Amaral Patrícia Chimin André Ricardo Alves de Proença Francisco Leonardo Torres Leal Rogério Antonio Laurato Sertié Amanda Baron Campana Andressa Bolsoni Lopes Arnaldo Henrique de Souza José Cipolla‐Neto Fabio Bessa Lima 《Journal of pineal research》2015,58(3):251-261
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals. 相似文献