全文获取类型
收费全文 | 3857篇 |
免费 | 189篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 77篇 |
儿科学 | 273篇 |
妇产科学 | 99篇 |
基础医学 | 415篇 |
口腔科学 | 174篇 |
临床医学 | 235篇 |
内科学 | 924篇 |
皮肤病学 | 129篇 |
神经病学 | 202篇 |
特种医学 | 115篇 |
外科学 | 599篇 |
综合类 | 37篇 |
一般理论 | 1篇 |
预防医学 | 183篇 |
眼科学 | 146篇 |
药学 | 233篇 |
中国医学 | 18篇 |
肿瘤学 | 198篇 |
出版年
2024年 | 7篇 |
2023年 | 41篇 |
2022年 | 53篇 |
2021年 | 120篇 |
2020年 | 91篇 |
2019年 | 118篇 |
2018年 | 118篇 |
2017年 | 100篇 |
2016年 | 129篇 |
2015年 | 124篇 |
2014年 | 144篇 |
2013年 | 191篇 |
2012年 | 299篇 |
2011年 | 294篇 |
2010年 | 146篇 |
2009年 | 111篇 |
2008年 | 214篇 |
2007年 | 239篇 |
2006年 | 256篇 |
2005年 | 260篇 |
2004年 | 210篇 |
2003年 | 194篇 |
2002年 | 146篇 |
2001年 | 72篇 |
2000年 | 90篇 |
1999年 | 52篇 |
1998年 | 15篇 |
1997年 | 11篇 |
1995年 | 11篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1992年 | 20篇 |
1991年 | 25篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 16篇 |
1987年 | 13篇 |
1986年 | 11篇 |
1985年 | 13篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 8篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1970年 | 4篇 |
排序方式: 共有4058条查询结果,搜索用时 0 毫秒
41.
Rodrigo Ca?ada Trofo SURJAN Fábio Ferrari MAKDISSI Marcel Autran Cesar MACHADO 《Brazilian archives of digestive surgery》2015,28(2):128-131
Background
Anatomical liver resections are based on some basic technical principles such as vascular control, ischemic area delineation to be resected and maximum parenchymal preservation. These aspects are achieved by the intrahepatic glissonian approach, which consists in accessing the pedicles of hepatic segments within the hepatic parenchyma. Small incisions on well-defined anatomical landmarks are performed to approach the pedicles, making dissection of the hilar plate unnecessary.Aim
Analyze parameters in liver anatomy related to intrahepatic surgical technique to glissonians pedicles, to set the normal anatomy related to the procedure and thereby facilitate the attainment of this technique.Methods
Anatomical parameters related to the intrahepatic glissonian approach were studied in 37 cadavers. Measurements were performed with precision instruments. Data were expressed as mean±standard deviation. The subjects were divided into groups according to gender and liver weight and groups were compared statistically.Results
Twenty-five cadavers were male and 12 female. No statistically significant difference was observed in virtually all parameters when groups were compared. This demonstrates the consistency of the anatomical parameters related to the intrahepatic glissonian approach.Conclusion
The results obtained in this study made possible major technical advances in the realization of open and laparoscopic hepatectomies with intrahepatic glissonian approach, and can help surgeons to perform liver resections by this method. 相似文献42.
43.
44.
Zeynep Tuna Tulin Duger Nevin Atalay-Guzel Arzu Aral Bilkay Basturk Seminur Haznedaroglu Berna Goker 《Journal of Physical Therapy Science》2015,27(4):1239-1242
[Purpose] Although oxidative stress is known to be present in rheumatoid arthritis (RA),
the effects of exercise on oxidative parameters are unknown. The aim of this study was to
investigate the effects of acute aerobic exercise on serum oxidant and antioxidant levels
in patients with RA. [Subjects and Methods] Sixteen patients with RA and 10 age-matched
healthy volunteers participated in this study. All participants wore polar telemeters and
walked on a treadmill for 30 minutes at a speed eliciting 60–75% of maximal heart rates.
Blood samples were obtained before, immediately and 24 hours after exercise and
malondialdehyde (MDA) and total sulfhydrile group (RSH) levels were measured. [Results]
Both groups had similar heart rates during the test but the treadmill speed of the RA
patients was significantly lower than that of the healthy volunteers. Serum MDA levels
were lower than in both groups immediately after exercise, with greater decrements in the
RA patients than controls. MDA levels returned to baseline 24 hours after the exercise
only in the controls; they remained low in the RA patients. There was a slight increase in
serum RSH levels after exercise compared to baseline in both groups. [Conclusion] Moderate
intensity treadmill exercise did not have any adverse effect on the oxidant-antioxidant
balance. The results suggest that such an exercise may be safely added to the
rehabilitation program of RA for additional antioxidant effects. Morever, this antioxidant
environment is maintained longer in RA patients.Key words: Aerobic exercise, Oxidative status, Rheumatoid arthritis 相似文献
45.
Esra Akyüz ?zkan Ceren Canbey G?ret Zeynep Tu?ba ?zdemir Serdar Yan?k Meryem Do?an Aylin G?nülta? Ay?e Neslin Akkoca 《International journal of clinical and experimental pathology》2015,8(9):11543-11548
Background: Although primary bone tumors are relatively uncommon, they constitute the most important tumors in patients less than 20 years. We aimed to determine the frequencies of primary bone tumors and tumor-like lesions of bone and the anatomical sites of their occurrence. Methods: A retrospective review of histopathology reports of all bone specimens received in a private pathology laboratory in Istanbul between 2009 and 2015. Results: A total of 57 patients (aged 5 to 18 years) with a mean of 13.12 years were studied. Thirty five patients (61.4%) were males and 22 (38.6%) were females. Fifty five (94.4%) of the tumors were benign. Osteochondroma was the commonest tumor accounting for 31 cases (54.3%) followed by osteoid osteoma, 9 cases (15.7%). Chondrosarcoma observed in two patients and Ewing sarcoma in one patient as malignant tumors. Of the 57 bone tumors 13 (22.8%) occurred in the upper extremities, while 44 (77.2%) were in the lower extremities. Proximal humerus was the most commonly involved site in upper extremity tumors, with osteochondromas representing the most frequent type of tumor (4 patients; 7%). In the lower extremities again osteochondromas were the most common type of tumor (8 cases, 14%), with the femur being the most common site of involvement (18 patients, 31.5%). Of the patients with tumor-like lesions; four patients had fibrous dysplasia, 4 patients had non-ossified fibromas, 4 patients had simple bone cysts and 3 had aneurismal bone cyst. Conclusion: This study showed that primary bone tumors were mainly benign, settled predominantly in the lower extremities mostly in the femur with a male preponderance. Osteochondroma was the most common benign bone tumor. We didn’t observed osteosarcoma, which is the most frequent malignant bone tumor. 相似文献
46.
Exome sequencing identifies a homozygous C5orf42 variant in a Turkish kindred with oral‐facial‐digital syndrome type VI 下载免费PDF全文
47.
48.
49.
Gossec L Smolen JS Gaujoux-Viala C Ash Z Marzo-Ortega H van der Heijde D FitzGerald O Aletaha D Balint P Boumpas D Braun J Breedveld FC Burmester G Cañete JD de Wit M Dagfinrud H de Vlam K Dougados M Helliwell P Kavanaugh A Kvien TK Landewé R Luger T Maccarone M McGonagle D McHugh N McInnes IB Ritchlin C Sieper J Tak PP Valesini G Vencovsky J Winthrop KL Zink A Emery P;European League Against Rheumatism 《Annals of the rheumatic diseases》2012,71(1):4-12
50.
Purpose: The aim of this study was to evaluate the fracture strength of experimental hollow and solid design zirconia dowels. Materials and Methods: Three types of dowels (fiber‐reinforced composite [FRC], hollow design, and solid design zirconia dowels) were tested in the study (n = 10). A three‐point bending method was conducted, and a load was applied until fracture. The values were recorded as Newtons (N) and then converted to megapascals (MPa) according to the diameter of the dowels. Statistical analyses were performed using one‐way ANOVA and Tukey HSD tests. The significance was set at p < 0.05. Results: The mean fracture strength of the hollow design zirconia dowels was significantly higher (960.72 MPa) than solid zirconia dowels (741.78 MPa) and FRC dowels (687.64 MPa) (p < 0.05). Conclusions: The hollow design zirconia dowel seems to have sufficient fracture strength for anterior restorations. This design may be beneficial to access the apical region when retreatment is necessary, without any dowel‐removing procedure. 相似文献