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排序方式: 共有104条查询结果,搜索用时 15 毫秒
81.
刘德启 《辐射研究与辐射工艺学报》2004,22(4):201-204
在光疗动力学过程或在生物体光敏氧化过程的控制中,高效廉价的光敏剂或抑制剂的选择是技术的关键。利用光敏剂在光照条件下产生的活性氧氧化二苯基碳酰肼,生成红色二苯基碳酰腙,用三氯化碳萃取;并以无光敏剂时的萃取液为参比,在最大吸收波长563.0nm处测其吸光度值A563;或在该体系中加入抑制剂,以不加抑制剂为参比,计算△A563。实验证明,相同的光照强度与光照时间,用分光光度计测得的A563或△A563/A563值的大小作为快速筛选光敏剂、抑制剂及评价其效果的依据,结果可靠,方法快捷。 相似文献
82.
Marcin Wierzchowski Daniel Ziental Dawid aewski Artur Korzanski Agnieszka Gielara-Korzanska Ewa Tykarska Jolanta Dlugaszewska Lukasz Sobotta 《International journal of molecular sciences》2022,23(11)
Newly developed tetra- and octasubstituted methimazole-phthalocyanine conjugates as potential photosensitizers have been obtained. Synthesized intermediates and final products were characterized by the MALD-TOF technique and various NMR techniques, including 2D methods. Single-crystal X-ray diffraction was used to determine the crystal structures of dinitriles. The studied phthalocyanines revealed two typical absorption bands—the Soret band and the Q band. The most intense fluorescence was observed for octasubstituted magnesium(II) phthalocyanine in DMF (ΦFL = 0.022). The best singlet oxygen generators were octasubstituted magnesium(II) and zinc(II) phthalocyanines (Φ∆ 0.56 and 0.81, respectively). The studied compounds presented quantum yields of photodegradation at the level between 10−5 and 10−6. Due to their low solubility in a water environment, the liposomal formulations were prepared. Within the studied group, octasubstituted zinc(II) phthalocyanine at the concentration of 100 µM activated with red light showed the highest antibacterial activity against S. aureus equal to a 5.68 log reduction of bacterial growth. 相似文献
83.
Bridgette Mkhobongo Rahul Chandran Heidi Abrahamse 《International journal of molecular sciences》2021,22(18)
Photodynamic Therapy (PDT), an unconventional cancer therapy with optimistic desirable effects, utilizes the delivery of a photosensitizer (PS) that is activated by light at a particular wavelength and inducing oxidative cytotoxic damage of a tumor and its surrounding vasculature. Deeper seated tumors such as internally metastasized melanomas are more difficult to treat with PDT as the penetration of laser light to those sites is less. Limitations in targeting melanomas can also be attributed to melanin pigments that hinder laser light from reaching targeted sites. Exosomes serve as naturally occurring nanoparticles that can be re-assembled with PSs, improving targeted cellular absorption of photosensitizing agents during PDT. Additionally, studies indicate that exosomes released from PDT-treated tumor cells play a critical role in mediating anti-tumor immune responses. This review collates the role of Melanoma Cell-Derived Exosomes (MTEX) in immune response mediation and metastasis. Tumor Cell-Derived Exosomes (TEX) post PDT treatment are also reviewed, as well as the effects of exosomes as carriers of photosensitizers and delivery systems for PDT. The understanding and research on the role of melanoma exosomes induced by Photodynamic Therapy and their tumor microenvironment will assist in future research in treatment prospects and implications. 相似文献
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目的: 探讨华蟾素联合光动力学疗法(PDT)对荷H22肝癌小鼠胃动素、胃泌素的影响。方法: 采用甲脂化叶绿素(MECD)光敏剂联合华蟾素治疗移植性H22肝癌小鼠,测定其抑瘤率及胃动素、胃泌素水平。结果: PDT联合华蟾素组、华蟾素组、PDT组的抑瘤率分别为 51.69%、33.49%、26.50%, PDT治疗后可以使胃动素、胃泌素保持在一定的水平,并减轻化疗引起的呕吐、恶心等消化道反应。结论: 华蟾素联合光动力学疗法可增强H22肝癌小鼠的杀伤效应,同时能明显改善小鼠整体情况,无明显不良反应和副作用,具有可行意义,值得推荐。 相似文献
86.
建立了一种新的测量单态氧荧光光谱和量子产率的方法,定量测定了HA光敏剂敏化单态氧的量子产率。结果表明,测定单态氧在1270nm的荧光光谱,是测定敏化单态氧量子产率的方便而可靠的方法。 相似文献
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89.
光动力学疗法中光热效应的有限元法 总被引:3,自引:3,他引:3
有限元法(FEM)由Matlab程序实现。生物热传输模型为经典的Pennes方程,加入了血液灌流项,研究了Nd:YAG激光(1064nm)平行光束照射下肝脏组织的温度响应,在轴对称柱坐标下三维温度分布简化为径向、轴向随时间的分布,三维分布彩图还可结合时间作动画显示。数值模拟结果表明,血液灌流在光动力学疗法(PDT)中可避免局部高温,并使温度在很短的时问上升到稳态,如果该稳态温度设为治疗的最佳温度,则可增加疗效并且缩短治疗时间;组织光热参数会影响模拟结果,计算精度和时间也需折衷考虑。 相似文献
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