共查询到20条相似文献,搜索用时 93 毫秒
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目的:本实验自制竹红菌素修饰的脂质微泡,联合LED光源对人舌癌细胞Tca8113进行光动力处理后观察细胞.方法:常规培养,取对数生长期的舌癌细胞Tca8113,机械振荡法制备竹红菌素修饰的脂质微泡,联合LED光源对细胞进行光动力治疗,MTT法检测细胞存活率,并用流式分析仪分析其促凋亡作用.结果:MTT法和流式细胞仪显示竹红菌素修饰的脂质微泡联合LED光源照射对Tca8113人舌癌细胞有明显凋亡现象,且在一定浓度范围和光照能量密度范围内,其凋亡作用与HB微泡浓度和能量密度呈正相关.结论:竹红菌素修饰的纳米脂质微泡联合LED光源光动力疗法对人舌癌细胞Tca8113有促凋亡抑制作用. 相似文献
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实验研究了微泡雾的遮蔽性能,分别利用OPAG33傅立叶变换红外光谱仪研究了红外波段的遮蔽性能,利用红外成像仪分析微泡雾的实物遮蔽能力以及遮蔽率.测试结果显示,微泡雾对远红外(8 μm~14 μm)的遮蔽率能达80%以上;微泡雾对热像仪能够实现有效遮蔽.研究表明:对于微泡雾,由于其基本单元-连体微泡团直径较小且液膜薄,易于漂浮和运动,不仅含有微泡团之间在光路上的速度切变,而且还存在微泡团自身的脉动,及其速度的变化,提高了微泡雾的光学散射性能,因此,微泡雾具有高效的遮蔽性能. 相似文献
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一种新型光敏剂HA激发态敏化单态氧的光谱测量 总被引:4,自引:0,他引:4
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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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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本文对新型基于水银为介质的微流体加速度开关进行了理论可行性分析研究。在理论上说明了水银加速度开关的原理。在分析了水银加速度开关可行性及其潜在的优点的基础上,本文对于在不同加速度作用下,水银运动的方程进行了理论探索,这对于整个开关的研究具有重要意义。 相似文献
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在微纳光纤的制作中,制作方法和相关参数的选择与控制是影响其光学传输特性的重要因素。该文基于单模光纤,理论模拟并实验分析了熔融拉锥法和氢氟酸(HF)腐蚀法在制备微纳光纤(MNF)过程中的相关参数与传输光学特性变化规律。研究表明,在制备MNF过程中,直径从20 μm减小到0时,传输功率损耗达97%,受耦合损耗和环境折射率变化的影响,理论损耗值与实验结果虽存在一定差异,但变化规律保持一致。通过OptiFDTD软件模拟,指出倏逝场深度随着光纤直径的减小而增大,且与损耗存在非线性关系,当输入光波波长与光纤的直径相比拟时,能量几乎全部集中在光纤的表面,此时外界环境变化对光纤内光波导响应灵敏度提高,微纳光纤的这种特性在传感领域具有潜在的应用市场。 相似文献
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目的:探讨超声微泡介导基因转染面神经的可行性及有效性。方法:建立小鼠面神经损伤模型,以增强型绿色荧光蛋白质粒(pEGFP)为标记基因。将48只小鼠随机分为6组:空白组(A组)、脂质体+质粒组(B组)、微泡+质粒+超声组(C组)、微泡+质粒组(D组)、超声+质粒组(E组)、单纯质粒组(F组)。将小鼠面神经损伤后,局部注射... 相似文献
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目的:探讨超声微泡造影剂在一定强度的超声波照射下介导野生型p53(wtp53)基因转染荷瘤小鼠的可行性,为实现外源基因高效,定向的转移目的奠定基础。方法:将12只BAlB/C(nu/nu)裸小鼠双眼玻璃体腔接种HXO-Rb44细胞,造模成功后,将动物随机分为2组,第1组于尾静脉注入含质粒的微泡造影剂;第2组尾静脉注射质粒与微泡的混合液,并立即以0.5W/cm2〔1〕的超声波辐照小鼠眼球60s,工作时间控制为20%。转染7天后,处死动物,摘除眼球,RT-PCR检测wtp53基因的表达情况。结果:超声照射组动物的肿瘤组织中均检测到wtp53的mRNA表达,而未照射组动物肿瘤组织中未检测到mRNA的表达。结论:超声微泡能使外源基因wtp53高效的转染小鼠RB肿瘤组织。 相似文献
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依据微空心阴极自持的辉光放电结构,设计了一款新颖的微小放电结构.用空气进行了有关的放电实验,稳定的直流辉光放电,放电气压最大能够达到66.7 kPa.放电的伏安特性具有正的斜坡,放电能够稳定地运行,而不需要个体镇流电阻.在气压为40 kPa和放电电流为60 mA时,放电等离子体中的电流密度估计为0.048 A/cm2,功率密度估计为52.8 W/cm3,电子密度估计为2.7×1013 cm-3.实验结果表明:这种高气压、大体积、高电子密度的放电等离子体能够用作小型激光器的工作介质. 相似文献
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Iu I kudriavets V A Nadgornaia V Iu Umanski? V I Struk 《Eksperimental?nai?a onkologii?a》1985,7(4):49-53
The procedure for obtaining the CL-C5 suspension cell line from the transplantable rat leukemia (erythromyelosis) is described. Cytochemical and biochemical features of CL-C5 blast cells are established to be typical of T-cells at the differentiation stage, corresponding to thymocytes. The results obtained permit considering CL-C5 cell line as that having phenotypical indications of lymphocytes and retrovirus production lost due to the selection in the cell population. 相似文献
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F. F. Dubrovka Yu. A. Ovsianyk R. F. Dubrovka 《Radioelectronics and Communications Systems》2012,55(12):559-562
Copolar and crosspolar radiation as well as matching characteristics of a novel dual-band coaxial hybrid-mode feed horn with partial dielectric loading [1] for reflector antennas have been numerically and experimentally investigated. In comparison with dual-band corrugated horns this horn has higher crosspolar level, but provides larger band separation and rather good electrical performances over a wide frequency range (20% and more) within each operational frequency band. Furthermore, the main concept of the coaxial feed system can be easily extended for multi-band cost-effective applications in reflector antennas with polarization diversity. 相似文献
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Wen-Shyang Chen Kin-Lu Wong Jeen-Sheen Row 《Antennas and Propagation, IEEE Transactions on》1994,42(2):260-264
The authors present the superstrate loading effect on a circularly polarized rectangular microstrip antenna. The design parameters of the superstrate-loading microstrip antenna for achieving circular polarization at the main-beam direction are discussed. The circular polarization property in the entire main-beam region is also analyzed. Next, the crosspolarization characteristics of a rectangular patch antenna due to the superstrate loading are studied. A great dependence of the copolarized and crosspolarized radiations on the superstrate permittivity and thickness is observed 相似文献
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Hongzhong Liu Yucheng Ding Yiping Tang Bingheng Lu Hongbo Lan Yongsheng Shi Lei Yin 《Microelectronic Engineering》2009,86(1):4-9
In UV nanoimprint lithography (NIL) with elastic mould, a novel multi-step loading and demoulding process, called distortion reduction by pressure releasing (DRPR) and two-step curing method for demoulding, is developed. This novel imprint process is continuous, the pressure releasing method, used to optimize the loading process, can reduce the distortions of imprint mould and wafer stage, while obtain better cavity filling and thin and uniform residual layer; through two-step curing method instead of traditional simple demoulding, the curing degree of resist can be controlled, which is helpful to decrease the demoulding force and avoid residual layer pulled-up while ensure replicated protrusions not collapse. It is a novel and robust process with high fidelity of pattern replication in micro/nano structures fabrication, and the replication error caused by distortions and “blind” demoulding can be reduced effectively. 相似文献
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Two methods for preparing white emitting EL panels are well known in principle: (1) blending a blue and an orange emitting
EL phosphor and (2) partially cascading of green EL emission with a red photoluminescent material, typically an organic fluorescent
dye. Both methods have their advantages and shortcomings. Panels containing phosphor blends are readily viewed even in moderately
bright ambient light but the “ white” color is reasonably stable only over limited times because the blue phosphor comnonent
deteriorates faster than the orange. Cascading panels show very long lives, depending on the green EL phosphor involved, without
any visible color change but these panels can be used only under restricted ambient light conditions. Brightnesses and efficiencies
of both kinds of panels are about comparable 相似文献