全文获取类型
收费全文 | 1838篇 |
免费 | 113篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 61篇 |
妇产科学 | 60篇 |
基础医学 | 249篇 |
口腔科学 | 67篇 |
临床医学 | 202篇 |
内科学 | 386篇 |
皮肤病学 | 58篇 |
神经病学 | 117篇 |
特种医学 | 65篇 |
外科学 | 146篇 |
综合类 | 69篇 |
一般理论 | 1篇 |
预防医学 | 133篇 |
眼科学 | 34篇 |
药学 | 195篇 |
中国医学 | 7篇 |
肿瘤学 | 97篇 |
出版年
2024年 | 6篇 |
2023年 | 37篇 |
2022年 | 87篇 |
2021年 | 97篇 |
2020年 | 74篇 |
2019年 | 85篇 |
2018年 | 84篇 |
2017年 | 60篇 |
2016年 | 52篇 |
2015年 | 71篇 |
2014年 | 97篇 |
2013年 | 124篇 |
2012年 | 184篇 |
2011年 | 165篇 |
2010年 | 92篇 |
2009年 | 54篇 |
2008年 | 89篇 |
2007年 | 79篇 |
2006年 | 104篇 |
2005年 | 86篇 |
2004年 | 72篇 |
2003年 | 46篇 |
2002年 | 52篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1967年 | 2篇 |
1945年 | 2篇 |
排序方式: 共有1960条查询结果,搜索用时 15 毫秒
41.
42.
43.
Tarek El-Bialy Adel Alhadlaq Nayef Felemban Jasper Yeung Amal Ebrahim Ali H. Hassan 《The Angle orthodontist》2015,85(2):233
Objective:To evaluate the effect of a light-emitting diode (LED) and/or low-level laser (LLL) with or without the use of anterior bite jumping appliances (also known as functional appliances [FAs]) on mandibular growth in rats.Materials and Methods:Thirty-six 8-week-old male Sprague-Dawley rats weighing 200 g were obtained from Charles River Canada (St. Constant, QC, Canada) and were divided into six groups of six animals each. Groups were as follows: group 1: LLL; group 2: LLL + FA; group 3: LED; group 4: LED + FA; group 5: FA; and group 6: control (no treatment). Mandibular growth was evaluated by histomorphometric and micro computed tomographic (microCT) analyses.Results:The LED and LED + FA groups showed an increase in all condylar tissue parameters compared with other groups.Conclusion:The LED-treated groups showed more mandibular growth stimulation compared with the laser groups. 相似文献
44.
Hypertension is twice as common in patients with diabetes compared to those without diabetes. It accounts for up to 75% of cardiovascular disease risk leading to the substantial increase in morbidity and mortality. Control of blood pressure in people with diabetes has been shown in randomized controlled trials to decrease cardiovascular risk and improve outcome especially in preventing stroke. A target blood pressure goal of <130/80 mm Hg is currently recommended for patients with diabetes. However, less than 1/3 of these patients achieve such a goal. This is in part due to the inherent difficulty in controlling blood pressure in these patients where hypertension is usually associated with increased salt sensitivity, volume expansion and isolated systolic hypertension. Therefore, patients with diabetes usually require multiple medications for optimal blood pressure control. Calcium channel antagonists have been shown in large clinical trials to be both safe and effective in controlling blood pressure in diabetic patients and will continue to play a major role in the management of hypertension in this population, particularly in the combination therapy that these patients usually require. 相似文献
45.
46.
47.
48.
Hind Bouguerra Elyes Boutouria Mokhtar Zorraga Amal Cherif Rihab Yazidi Naima Abdeddaiem Latifa Maazaoui Awatef ElMoussi Salma Abid Slim Amine Leila Bouabid Souha Bougatef Mohamed Kouni Chahed Afif Ben Salah Jihene Bettaieb Nissaf Bouafif Ben Alaya 《Influenza and other respiratory viruses》2020,14(5):507-514
49.
Perumalraja Kirthika Amal Senevirathne Vijayakumar Jawalagatti SungWoo Park 《Gut microbes》2020,11(6):1695-1712
ABSTRACT In the present study, we characterized the involvement of Lon protease in bacterial virulence and intracellular survival in Salmonella under abiotic stress conditions resembling the conditions of a natural infection. Wild type (JOL401) and the lon mutant (JOL909) Salmonella Typhimurium were exposed to low temperature, pH, osmotic, and oxidative stress conditions and changes in gene expression profiles related to virulence and metal ion uptake were investigated. Expression of candidate genes invF and hilC of Salmonella Pathogenicity Island (SPI)-1 and sifA and sseJ of SPI-2 revealed that Lon protease controls SPI-1 genes and not SPI-2 genes under all stress conditions tested. The lon mutant exhibited increased accumulation of hydroxyl (OH·) ions that lead to cell damage due to oxidative stress. This oxidative damage can also be linked to an unregulated influx of iron due to the upregulation of ion channel genes such as fepA in the lon mutant. The deletion of lon from the Salmonella genome causes oxidative damage and increased expression of virulence genes. It also prompts the secretion of host pro-inflammatory cytokines leading to early clearance of the bacteria from host cells. We conclude that poor bacterial recovery from mice infected with the lon mutant is a result of disrupted bacterial intracellular equilibrium and rapid activation of cytokine expression leading to bacterial lysis. 相似文献
50.
Rihab M. Salih Esraa A. Mohammed Amal M. Alhashem Sarar Mohamed Aida I. Al-aqeel 《Saudi medical journal》2020,41(2):199
Objectives:To draw attention towards fructose-1,6-bisphosphatase (FBPase) deficiency as an important cause of hypoglycemia and lactic acidosis and to implement preventive strategies.Methods:This observational, cross-sectional study was conducted on 7 Saudi patients with genetically confirmed FBPase deficiency from 2008 to 2018 at Prince Sultan Military Medical City, Riyadh, Saudi Arabia.Results:Participants ranged in age from 1-10 years, and all presented with recurrent hypoglycemia. All but one had associated severe metabolic acidosis, and 3 patients (42.9%) presented with hypoglycemia and severe acidosis since birth. The mean duration from presentation to diagnosis was 39.4 months, as other diagnoses, like glycogen storage diseases and mitochondrial diseases needed to be ruled out. Development was normal apart from speech delay in one patient with a novel variant of the FBP1 gene. All patients have homozygous variants in the FBP1 gene.Conclusion:Fructose-1,6-bisphosphatase is an important cause of hypoglycemia and acidosis; therefore, it is important to offer early molecular diagnostics in any child presenting with these symptoms. Molecular diagnostics should always be undertaken to confirm the diagnosis and for further preventive strategies. 相似文献