全文获取类型
收费全文 | 4475篇 |
免费 | 421篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 109篇 |
儿科学 | 141篇 |
妇产科学 | 66篇 |
基础医学 | 414篇 |
口腔科学 | 445篇 |
临床医学 | 426篇 |
内科学 | 989篇 |
皮肤病学 | 199篇 |
神经病学 | 293篇 |
特种医学 | 200篇 |
外科学 | 783篇 |
综合类 | 104篇 |
现状与发展 | 30篇 |
预防医学 | 315篇 |
眼科学 | 46篇 |
药学 | 209篇 |
中国医学 | 16篇 |
肿瘤学 | 139篇 |
出版年
2024年 | 19篇 |
2023年 | 211篇 |
2022年 | 71篇 |
2021年 | 124篇 |
2020年 | 138篇 |
2019年 | 120篇 |
2018年 | 199篇 |
2017年 | 128篇 |
2016年 | 153篇 |
2015年 | 175篇 |
2014年 | 218篇 |
2013年 | 237篇 |
2012年 | 221篇 |
2011年 | 285篇 |
2010年 | 224篇 |
2009年 | 219篇 |
2008年 | 188篇 |
2007年 | 232篇 |
2006年 | 175篇 |
2005年 | 152篇 |
2004年 | 137篇 |
2003年 | 110篇 |
2002年 | 107篇 |
2001年 | 74篇 |
2000年 | 83篇 |
1999年 | 80篇 |
1998年 | 58篇 |
1997年 | 60篇 |
1996年 | 50篇 |
1995年 | 50篇 |
1994年 | 39篇 |
1993年 | 44篇 |
1992年 | 35篇 |
1991年 | 41篇 |
1990年 | 37篇 |
1989年 | 41篇 |
1988年 | 30篇 |
1987年 | 32篇 |
1986年 | 23篇 |
1985年 | 34篇 |
1984年 | 18篇 |
1981年 | 15篇 |
1980年 | 21篇 |
1979年 | 17篇 |
1976年 | 19篇 |
1975年 | 17篇 |
1974年 | 15篇 |
1970年 | 14篇 |
1969年 | 14篇 |
1968年 | 17篇 |
排序方式: 共有4924条查询结果,搜索用时 15 毫秒
1.
A mixed‐method study of effects of a therapeutic play intervention for children on parental anxiety and parents' perceptions of the intervention 下载免费PDF全文
2.
3.
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
4.
John Lennon Silva Cunha Amanda Almeida Leite Thamiris de Castro Abrantes Lorena Passoni Vervloet Thayn Melo de Lima Morais Gerson de Oliveira Paiva Neto Tatiana Nayara Librio Kimura Snia Maria Soares Ferreira Ricardo Luiz Cavalcanti de Albuquerque‐Júnior Aline Corrêa Abraho Mario Jos Romaach Bruno Augusto Benevenuto de Andrade Oslei Paes de Almeida Ciro Dantas Soares 《Journal of cutaneous pathology》2021,48(1):24-33
5.
6.
7.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence. 相似文献
8.
Paulo Cezar Galv?o do Amaral Euler de Medeiros ázaro Filho Thales Delmondes Galv?o Ettinger Eric Junior Galeno Egydio José de Magalh?es Neto Fabrício Mascarenhas Edvaldo Fahel 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2006,10(3):355-358
BACKGROUND: Randomized studies demonstrate that laparoscopic appendectomy yields better results compared with open techniques. We sought to identify factors that determine an extended hospital stay among patients undergoing laparoscopic appendectomy. METHODS: This was a prospective study including 669 patients undergoing laparoscopic appendectomy. We analyzed variables that can predict the length of hospital stay. RESULTS: Of 669 patients undergoing laparoscopic appendectomy, 141 stayed in the hospital for > or = 5 days (Group 1), and 97 stayed in the hospital for < or = 1 day after surgery (Group 2). The univariate analysis demonstrated that fever (P<0.0001), nausea and vomiting (P=0.060), leukocytosis (P<0.0001), gangrened or perforated intraoperative appearance of the appendix (P<0.0001), and appendix position behind the ileocecal junction (P<0.001) were related to a longer hospital stay. The multivariate analysis through logistical regression showed that the factors independently and significantly associated with an extended hospital stay were presurgical fever, appendix position behind the ileocecal junction, and intraoperative gangrened or perforated appearance of the appendix. CONCLUSION: Fever, appearance, and position of the appendix are factors related to an extended hospital stay. 相似文献
9.
10.