全文获取类型
收费全文 | 1531篇 |
免费 | 80篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 18篇 |
儿科学 | 61篇 |
妇产科学 | 114篇 |
基础医学 | 102篇 |
口腔科学 | 29篇 |
临床医学 | 116篇 |
内科学 | 313篇 |
皮肤病学 | 73篇 |
神经病学 | 92篇 |
特种医学 | 90篇 |
外科学 | 379篇 |
综合类 | 28篇 |
预防医学 | 58篇 |
眼科学 | 29篇 |
药学 | 76篇 |
中国医学 | 19篇 |
肿瘤学 | 26篇 |
出版年
2023年 | 9篇 |
2022年 | 24篇 |
2021年 | 54篇 |
2020年 | 21篇 |
2019年 | 35篇 |
2018年 | 54篇 |
2017年 | 47篇 |
2016年 | 44篇 |
2015年 | 42篇 |
2014年 | 73篇 |
2013年 | 86篇 |
2012年 | 96篇 |
2011年 | 99篇 |
2010年 | 68篇 |
2009年 | 45篇 |
2008年 | 75篇 |
2007年 | 98篇 |
2006年 | 108篇 |
2005年 | 102篇 |
2004年 | 85篇 |
2003年 | 60篇 |
2002年 | 69篇 |
2001年 | 21篇 |
2000年 | 24篇 |
1999年 | 27篇 |
1998年 | 11篇 |
1997年 | 19篇 |
1996年 | 13篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 9篇 |
1989年 | 12篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 11篇 |
1982年 | 8篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1975年 | 1篇 |
1972年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有1623条查询结果,搜索用时 0 毫秒
41.
Murat Biteker Kadir Kayatas Funda Muserref Türkmen Cemile Handan Misirli 《Canadian journal of surgery》2014,57(3):E55-E61
Background
Although ischemic stroke is a well-known complication of cardiovascular surgery it has not been extensively studied in patients undergoing noncardiac surgery. The aim of this study was to assess the predictors and outcomes of perioperative acute ischemic stroke (PAIS) in patients undergoing noncardiothoracic, nonvascular surgery (NCS).Methods
We prospectively evaluated patients undergoing NCS and enrolled patients older than 18 years who underwent an elective, non-daytime, open surgical procedure. Electrocardiography and cardiac biomarkers were obtained 1 day before surgery, and on postoperative days 1, 3 and 7.Results
Of the 1340 patients undergoing NCS, 31 (2.3%) experienced PAIS. Only age (odds ratio [OR] 2.5, 95% confidence interval [CI] 1.01–3.2, p < 0.001) and preoperative history of stroke (OR 3.6, 95% CI 1.2–4.8, p < 0.001) were independent predictors of PAIS according to multivariate analysis. Patients with PAIS had more cardiovascular (51.6% v. 10.6%, p < 0.001) and noncardiovascular complications (67.7% v. 28.3%, p < 0.001). In-hospital mortality was 19.3% for the PAIS group and 1% for those without PAIS (p < 0.001).Conclusion
Age and preoperative history of stroke were strong risk factors for PAIS in patients undergoing NCS. Patients with PAIS carry an elevated risk of perioperative morbidity and mortality. 相似文献42.
43.
44.
45.
Marwan Abdul Hakim Shaah Md. Sohrab Hossain Faisal Aboelksim Salem Allafi Alyaa Alsaedi Norli Ismail Mohd Omar Ab Kadir Mardiana Idayu Ahmad 《RSC advances》2021,11(40):25018
There is increasing concern regarding alleviating world energy demand by determining an alternative to petroleum-derived fuels due to the rapid depletion of fossil fuels, rapid population growth, and urbanization. Biodiesel can be utilized as an alternative fuel to petroleum-derived diesel for the combustion engine. At present, edible crops are the primary source of biodiesel production. However, the excessive utilization of these edible crops for large-scale biodiesel production might cause food supply depletion and economic imbalance. Moreover, the utilization of edible oil as a biodiesel feedstock increases biodiesel production costs due to the high price of edible oils. A possible solution to overcome the existing limitations of biodiesel production is to utilize non-edible crops oil as a feedstock. The present study was conducted to determine the possibility and challenges of utilizing non-edible oil as a potential feedstock for biodiesel production. Several aspects related to non-edible oil as a biodiesel feedstock such as overview of biodiesel feedstocks, non-edible oil resources, non-edible oil extraction technology, its physicochemical and fatty acid properties, biodiesel production technologies, advantages and limitation of using non-edible oil as a feedstock for biodiesel production have been reviewed in various recent publications. The finding of the present study reveals that there is a huge opportunity to utilize non-edible oil as a feedstock for biodiesel production.There is increasing concern regarding alleviating world energy demand by determining an alternative to petroleum-derived fuels due to the rapid depletion of fossil fuels, rapid population growth, and urbanization. 相似文献
46.
Muhammad Umar Aslam Khan Mohsin Ali Raza Hassan Mehboob Mohammed Rafiq Abdul Kadir Saiful Izwan Abd Razak Saqlain A. Shah Muhammad Zahir Iqbal Rashid Amin 《RSC advances》2021,11(30):18615
Correction for ‘Development and in vitro evaluation of κ-carrageenan based polymeric hybrid nanocomposite scaffolds for bone tissue engineering’ by Muhammad Umar Aslam Khan et al., RSC Adv., 2020, 10, 40529–40542. DOI: 10.1039/D0RA07446B.The authors regret errors in Fig. 9 in the original article. The corrected Fig. 9 is shown below where all three +ive control panels and the 72 h CG-g-Aac-2 panel have been replaced.Open in a separate windowFig. 9Cell morphology of MC3T3-E1 against +ive control and all scaffold samples (CG-g-AAc1, CG-g-AAc2 and CG-g-AAc3) under standard in vitro conditions. The red arrows show thread-like morphology and the yellow arrows exhibits well-grown morphology of the cells.The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers. 相似文献
47.
48.
Kadir Desdicioglu Mehmet Ali Malas Selen Bahceci Fatma Simsek Ayse Gizem Polat 《Journal of the Anatomical Society of India》2017,66(1):37-42
Introduction
In our study, the aim was to anatomically and histologically investigate the morphometric structures of the branches involved in the sural nerve and sural nerve formation.Method
The study was conducted on 46 lower extremities of 23 fetuses which were obtained from Izmir Katip Çelebi University, Atatürk Training and Research Hospital, with ages from 18 and 32 gestational weeks, without any external pathology or anomaly. During the study period, the posterior-side skin dissection of the lower extremity was performed with the aid of a surgical dissection microscope initially, and the structures forming the sural nerve and the sural nerve were exposed and made visible. Afterwards, sections were taken from these structures for morphometric measurements and histological examination.Results
The mean values and standard deviations of morphometric measurements obtained were determined. Separately, it was determined that there was no statistical difference between right-left sides and genders in morphometric measurements (p > 0.05). The sural nerve was determined to be differentiated into 4 types as A, B, C and D according to the way the nerve branches forming sural nerve join. In addition, differing characteristics pertaining to the sural nerve and branches were determined.Discussion
We are of the opinion that the data obtained in our study will be of use to neurologists, orthopedists and clinicians engaged in this region during interventional procedures. 相似文献49.
Lichen myxedematosus: a case series focusing on clinical features,disease associations,and management 下载免费PDF全文
50.
Ozdogan M Ersoy E Dundar K Albayrak L Devay S Gundogdu H 《The Journal of surgical research》2005,129(2):260-264
BACKGROUND: Underlying hepatic injury and cirrhosis are leading factors that interfere with the post-operative liver regeneration and function. Hyperbaric oxygenation (HBO) has been reported to ameliorate the ischemia-reperfusion injury of the liver, to induce compensatory hypertrophy of the predicted remnant liver in rats after portal vein ligation and to augment liver regeneration after hepatectomy in non-cirrhotic rats. Our aim was to determine the effect of HBO treatment on liver regeneration after partial hepatectomy in normal and cirrhotic mice in this experimental study. MATERIALS AND METHODS: The effect of HBO on liver regeneration was studied in a mice model combining carbon tetrachloride induced cirrhosis and partial hepatectomy. Mice were divided into four groups: Control, cirrhotic, non-cirrhotic HBO-treated, and cirrhotic HBO-treated. All animals underwent 40% hepatectomy. Liver regeneration was evaluated by the proliferating cell nuclear antigen-labeling index. Serum aspartate aminotransferase and alanine aminotransferase levels were measured to evaluate liver injury. RESULTS: Serum alanine aminotransferase and aspartate aminotransferase levels were significantly decreased in HBO-treated cirrhotic group compared to cirrhosis group after hepatectomy (P = 0.001 and P = 0.014, respectively). The proliferating cell nuclear antigen labeling index was significantly higher in HBO treated cirrhotic group than in cirrhotic group after hepatectomy (P = 0.022). CONCLUSIONS: Our results suggest that HBO treatment improves liver functions and augments hepatocyte regeneration in cirrhotic mice after hepatectomy. Post-operative HBO treatment may have a beneficial effect on post-operative liver function and regeneration in cirrhotic patients. 相似文献