全文获取类型
收费全文 | 2165篇 |
免费 | 171篇 |
国内免费 | 4篇 |
专业分类
2340篇 |
出版年
2024年 | 5篇 |
2023年 | 18篇 |
2022年 | 65篇 |
2021年 | 86篇 |
2020年 | 86篇 |
2019年 | 176篇 |
2018年 | 124篇 |
2017年 | 66篇 |
2016年 | 99篇 |
2015年 | 125篇 |
2014年 | 103篇 |
2013年 | 160篇 |
2012年 | 201篇 |
2011年 | 172篇 |
2010年 | 95篇 |
2009年 | 95篇 |
2008年 | 113篇 |
2007年 | 95篇 |
2006年 | 90篇 |
2005年 | 71篇 |
2004年 | 57篇 |
2003年 | 57篇 |
2002年 | 43篇 |
2001年 | 10篇 |
2000年 | 11篇 |
1999年 | 8篇 |
1998年 | 9篇 |
1997年 | 11篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1988年 | 3篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 8篇 |
1976年 | 3篇 |
1974年 | 3篇 |
1973年 | 5篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有2340条查询结果,搜索用时 15 毫秒
81.
Interstitial photodynamic therapy (iPDT) has shown promise recently as a minimally invasive cancer treatment, partially due to the development of non‐toxic photosensitizers in the absence of activation light. However, a major challenge in iPDT is the pre‐treatment planning process that specifies the number of diffusers needed, along with their positions and allocated powers, to confine the light distribution to the target volume as much as possible. In this work, a new power allocation algorithm for cylindrical light diffusers including those that can produce customized longitudinal (tailored) emission profiles is introduced. The proposed formulation is convex to guarantee the minimum over‐dose possible on the surrounding organs‐at‐risk. The impact of varying the diffuser lengths and penetration angles on the quality of the plan is evaluated. The results of this study are demonstrated for different photosensitizers activated at different wavelengths and simulated on virtual tumors modeling virtual glioblastoma multiforme cases. Results show that manufacturable cylindrical diffusers with tailored emission profiles can significantly outperform those with conventional flat profiles with an average damage reduction on white matter of 15% to 55% and on gray matter of 23% to 58%. 相似文献
82.
83.
84.
85.
86.
Alanentalo T Asayesh A Morrison H Lorén CE Holmberg D Sharpe J Ahlgren U 《Nature methods》2007,4(1):31-33
A convenient technology to quantify three-dimensional (3D) morphological features would have widespread applications in biomedical research. Based on combined improvements in sample preparation, tomographic imaging and computational processing, we present a procedure for high-resolution 3D quantification of structures within intact adult mouse organs. Using the nonobese diabetic (NOD) mouse model, we demonstrate a correlation between total islet beta-cell volume and the onset of type-1 diabetes. 相似文献
87.
88.
89.
Farzad Rahmani Forouzan Amerizadeh Seyed Mahdi Hassanian Milad Hashemzehi Seyedeh-Najibeh Nasiri Hamid Fiuji Gordon A. Ferns Majid Khazaei Amir Avan 《Journal of cellular physiology》2019,234(8):14123-14132
The Wnt/β-catenin pathway is one of the most common pathways dysregulated in breast cancer, and may, therefore, be a potential-therapeutic target. We have investigated the effects of PNU-74654 in breast cancer, as a Wnt/β-catenin inhibitor, either alone or in combination with fluorouracil (5-FU). PNU-74654 suppressed cell growth at an IC 50 of 122 ± 0.4 μmol/L and synergistically enhanced the antiproliferative activity of gemcitabine by modulating the Wnt pathway. Using a 3D cell culture model, we found that the PNU-74654 caused tumor shrinkage. It reduced the migration of MCF-7 cells (by an 18% reduction in invasive behavior) after the treatment with PNU-74654 through perturbation of E-cadherin and MMP3/9. PNU-74654/5-FU combination enhanced the percentages of cells in S-phase and significantly increased apoptosis. Moreover, our data showed that this agent was able to inhibit the growth of tumor in a xenograft model, although this effect was more pronounced in the animals treated with PNU-74654 plus 5-FU. These data show the ability of PNU-74654 to specifically target Wnt pathway, interfere with cell proliferation, induce-apoptosis, reduce-migration, and synergistically interact with 5-FU, supporting further studies on this novel therapeutic-approach for breast cancer. 相似文献
90.
Atena Soleimani Mohammad Jalili-Nik Amir Avan Gordon A. Ferns Majid Khazaei Seyed Mahdi Hassanian 《Journal of cellular physiology》2019,234(6):8241-8248
Heat-shock protein 27 (HSP27) is a chaperone molecule that plays a critical role in the refolding and activity of several proteins responsible for cancer cell drug toxicity. Upregulation of HSP27 is associated with decreased drug sensitivity as well as poorer survival in gastrointestinal (GI) malignancies. It is, therefore, possible that HSP27 may be of value in the assessment of prognostic and therapeutic efficacy in the treatment of GI cancers. Pharmacological and biological inhibitors of HSP27 enhance tumor cell chemosensitivity. This review summarizes the potential role of HSP27 in chemotherapy drug resistance and the therapeutic potential of HSP27 inhibitors as a novel strategy in the treatment of GI cancers. 相似文献