全文获取类型
收费全文 | 321篇 |
免费 | 25篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 8篇 |
妇产科学 | 4篇 |
基础医学 | 45篇 |
口腔科学 | 4篇 |
临床医学 | 30篇 |
内科学 | 37篇 |
皮肤病学 | 5篇 |
神经病学 | 14篇 |
特种医学 | 11篇 |
外科学 | 99篇 |
综合类 | 2篇 |
预防医学 | 20篇 |
眼科学 | 1篇 |
药学 | 27篇 |
肿瘤学 | 32篇 |
出版年
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 18篇 |
2020年 | 13篇 |
2019年 | 16篇 |
2018年 | 33篇 |
2017年 | 12篇 |
2016年 | 13篇 |
2015年 | 22篇 |
2014年 | 13篇 |
2013年 | 29篇 |
2012年 | 32篇 |
2011年 | 27篇 |
2010年 | 18篇 |
2009年 | 16篇 |
2008年 | 19篇 |
2007年 | 17篇 |
2006年 | 15篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1980年 | 1篇 |
1971年 | 2篇 |
排序方式: 共有348条查询结果,搜索用时 15 毫秒
1.
2.
Mohammad-naghi Tahmasebi Mohsen Saghari Masoud Moslehi Ali Gholamrezanezhad 《BMC medical physics》2005,5(1):1-6
Background
Scintigraphy has been considered as competitive to MRI, but limited data are available on the accuracy of single photon emission tomography (SPECT) compared with MRI for the assessment of meniscal tears. Our objective was to assess the value of SPECT in comparison to MRI.Methods
Between January 2003 and March 2004, sixteen patients were studied with both modalities and the accuracy rates of SPECT scan results, and MRI findings in the diagnosis of meniscal tears were compared. Arthroscopy was the gold standard.Results
The respective sensitivity rate, specificity rate, and positive and negative predictive accuracies of MRI were 89%, 94%, 93%, and 79% and for SPECT those were 78%, 94%, 94%, and 88%. There was good agreement on the presence or absence of tears between two modalities (κ statistic = 0.699).Conclusion
SPECT and MRI are both valuable imaging techniques. SPECT is a useful alternative when MRI is unavailable or unsuitable and it is beneficial when more possible accuracy is desired (such as when MRI results are either inconclusive or conflict with other clinical data). 相似文献3.
Ghoreifi Alireza Basin Michael F. Ghodoussipour Saum Bazargani Soroush T. Amini Erfan Aslzare Mohammad Cai Jie Miranda Gus Sugeir Shihab Bhanvadia Sumeet Schuckman Anne K. Daneshmand Siamak Lumb Philip Djaladat Hooman 《International urology and nephrology》2021,53(9):1827-1833
International Urology and Nephrology - The aim of this study is to evaluate the intra/perioperative fluid management and early postoperative outcomes of patients who underwent radical cystectomy... 相似文献
4.
5.
M. Jeddi-Tehrani N. Abbasi P. Dokouhaki J. Ghasemi S. Rezania M. Ostadkarampour H. Rabbani M.A. Akhondi Z. Tahmasebi Fard A.H. Zarnani 《Journal of reproductive immunology》2009,80(1-2):41-48
Indoleamine 2,3-dioxygenase (IDO), an enzyme responsible for tryptophan catabolism, is thought to be required to prevent the rejection of the allogenic fetus by maternal T cells and to protect against intra- and extra-cellular pathogens. Consequently, we studied the expression of IDO in the endometrium of female Balb/c mice during the oestrous cycle. At each phase, the endometrium was peeled away and the relative expression of IDO mRNA was detected by semi-quantitative RT-PCR. The presence of IDO protein was confirmed in each phase by Western blotting and immunohistochemistry. Our results showed that IDO is expressed in the endometrium of cycling mice during all the phases of oestrous cycle. The expression of IDO was highest at the oestrus and lowest at the dioestrus. By means of Western blotting and immunohistochemistry, we obtained evidence that IDO protein is synthesised in the endometrium of cycling mice throughout the oestrous cycle. In accordance with RT-PCR results, IDO protein was predominant at the oestrus phase. IDO protein was mainly localised in the glandular and luminal epithelial cells. Our results support the concept of IDO providing a mechanism of innate immunity to protect from ascending infections of the female reproductive tract. In addition, considering the fact that mating only occurs during the oestrus phase, the high expression of IDO in this phase is likely to be a mechanism that induces immunological tolerance of the fetus. 相似文献
6.
In this work, a WOx/CsyWO3 heterostructured composite was synthesized via a simple pyrolysis method followed by heat treatment under a reducing atmosphere. Optical absorption results revealed the WOx/CsyWO3 heterostructured composite exhibits a strong absorption tail in the Vis and NIR regions which could have important implications for its photoactivity. The photocatalytic performance of synthesized samples with different Cs/W molar ratios was evaluated by the photodegradation of RhB in aqueous solution under simulated solar light irradiation. The results revealed that the photocatalytic activity of the WOx/CsyWO3 composite is much higher than those of pure tungsten bronze (CsxWO3, x = 0.32, and 0.5) and pure WO2.83 samples, where 90% RhB was degraded after 160 min irradiation. Also, the WOx/CsyWO3 composite exhibits excellent photocatalytic activity for the degradation of MO, MB, RhB, and MG aqueous solution under visible light irradiation. It is proposed that the higher photocatalytic activity of the WOx/CsyWO3 composite could be attributed to the greater surface adsorption of dye molecules, intense light absorption in the visible and NIR regions, and photogenerated electron–hole separation.In this work, a WOx/CsyWO3 heterostructured composite photocatalyst was synthesized via a simple pyrolysis method followed by heat treatment under a reducing atmosphere. 相似文献
7.
Stephen J. Traub Soroush Saghafian Adam C. Bartley Matthew R. Buras Christopher F. Stewart Brian T. Kruse 《The American journal of emergency medicine》2018,36(8):1367-1371
Introduction
Previous work has suggested that Emergency Department rotational patient assignment (a system in which patients are algorithmically assigned to physicians) is associated with immediate (first-year) improvements in operational metrics. We sought to determine if these improvements persisted over a longer follow-up period.Methods
Single-site, retrospective analysis focused on years 2–4 post-implementation (follow-up) of a rotational patient assignment system. We compared operational data for these years with previously published data from the last year of physician self-assignment and the first year of rotational patient assignment. We report data for patient characteristics, departmental characteristics and facility characteristics, as well as outcomes of length of stay (LOS), arrival to provider time (APT), and rate of patients who left before being seen (LBBS).Results
There were 140,673 patient visits during the five year period; 138,501 (98.7%) were eligible for analysis. LOS, APT, and LBBS during follow-up remained improved vs. physician self-assignment, with improvements similar to those noted in the first year of implementation. Compared with the last year of physician self-assignment, approximate yearly average improvements during follow-up were a decrease in median LOS of 18 min (8% improvement), a decrease in median APT of 21 min (54% improvement), and a decrease in LBBS of 0.69% (72% improvement).Conclusion
In a single facility study, rotational patient assignment was associated with sustained operational improvements several years after implementation. These findings provide further evidence that rotational patient assignment is a viable strategy in front-end process redesign. 相似文献8.
Jila Yavarian Farshid Rezaei Azadeh Shadab Mahmood Soroush Mohammad Mehdi Gooya Talat Mokhtari Azad 《Emerging infectious diseases》2015,21(2):362-364
During January 2013–August 2014, a total of 1,800 patients in Iran who had respiratory illness were tested for Middle East respiratory syndrome coronavirus. A cluster of 5 cases occurred in Kerman Province during May–July 2014, but virus transmission routes for some infections were unclear. 相似文献
9.
Nguyen Jie C. Shah Apurva S. Nguyen Michael K. Baghdadi Soroush Nicholson Anthony Guariento Andressa Kaplan Summer L. 《Emergency radiology》2021,28(3):565-572
Emergency Radiology - The purpose of this study was to systematically investigate the performance of different radiographic views in the identification of scaphoid fractures in children. This... 相似文献
10.
Farnaz C. Tahmasebi Peter Farmer Suzanne Z. Powell Kenneth D. Aldape Gregory N. Fuller Shital Patel Peter Hollis David Chalif Mark B. Eisenberg Jian Yi Li 《Virchows Archiv : an international journal of pathology》2013,462(4):473-480
Brain metastasis from papillary thyroid carcinoma (PTC) is extremely rare and carries a poor prognosis. We report nine cases (five females and four males) of brain metastasis of PTC. The age of patients ranged from 46 to 87 years old. The patients presented with nonspecific symptoms such as headaches. Brain metastasis was the first clinical presentation in three of nine patients; two of which had the aggressive tall cell variant of PTC. Six patients had prior history of PTC (four classic, one oncocytic variant, and one columnar cell variant) for 2 to 17 years with a median of 12 years. Gross total resection of brain metastasis was achieved for eight of our patients. Eight patients were treated with radioactive iodine. The median follow-up time was 12 months, ranging from 1 month to 4 years. Three patients died of their disease in 6 months, 21 months and 4 years, respectively after their first presentation of brain metastasis. It seems that these rare aggressive variants of PTC, such as tall cell variant, not only have higher propensity to develop brain metastasis, but also more frequently present with brain metastasis as their first clinical presentation than classic PTC. Furthermore, patients with PTC can develop brain metastasis even after many years. 相似文献