MTT检测超声激活血卟啉对SW-480细胞的杀伤作用

采用1.1、1.6、2.3MHz频率聚焦超声结合血卟啉的方式对体外培养的人结肠癌细胞SW 480进行照射,其介质分别为NaCl溶液、RPMI1640、完全培养基,用MTT法测试了SDT对肿瘤细胞的杀伤效果.结果表明,SW 480细胞在声照强度为1.5W/cm2,频率2.3MHz条件下,介质为NaCl溶液、RPMI1640和完全培养基中都存在超声激活血卟啉增强杀伤肿瘤细胞的效果,且在RPMI1640和完全培养基中这种效果和处理后细胞孵育的时间有一定的相关性.     

超声激活血卟啉对在体艾氏腹水瘤杀伤效应的研究初报

利用超声激活血卟啉，研究对在体艾氏腹水瘤癌细胞的杀伤作用．实验分别选择不同的超声时间及取材时间．结果表明，单纯超声及血卟啉加超声组对肿瘤细胞均有杀伤作用．强度为0．9W／cm^2，声照3min，6h取材，为艾氏腹水瘤的杀伤效应最佳参数．     

超声激活血卟啉对K_(562)肿瘤作用的研究

研究了超声激活血卟啉对人体肿瘤细胞Ｋ５６２的作用,以及声参量和血卟啉浓度对瘤细胞杀伤率的影响．结果表明,声参量和血卟啉浓度与瘤细胞杀伤率呈正相关．当频率为１．８ＭＨｚ,声强度为１．５Ｗ／ｃｍ２,作用时间为６０ｓ,血卟啉浓度为２００μｇ／ｍＬ时,超声激活血卟啉对Ｋ５６２肿瘤作用效果较佳,杀伤率达９８％,超声单独作用,杀伤率仅为４２％．单纯血卟啉无抗肿瘤效应．     

血卟啉单甲醚介导的声动力对U937细胞增殖影响

研究了聚焦超声激活血卟啉单甲醚对人髓系白血病细胞株U937细胞的增殖抑制作用.通过MTT法检测了频率为1.1MHz的聚焦超声激活血卟啉单甲醚作用于U937肿瘤细胞的存活率.MTT实验结果显示:声照辐射60s、强度为2~7 W/cm2的超声对U937细胞的抑制作用呈强度依赖性;单纯血卟啉单甲醚组与对照组相比无显著性差异(P0.05);同等条件下,2 W/cm2超声结合10ng/L血卟啉单甲醚组对U937肿瘤细胞有明显的协同杀伤作用,与对照组相比有极显著性差异(P0.01).这些结果表明,超声联合血卟啉单甲醚声动力能够特异性抑制U937细胞生长,血卟啉单甲醚有望成为一种新型声敏剂应用于白血病的声动力治疗.     

超声激活血卟啉对K562肿瘤作用的研究

研究了超声激活血卟啉对人体肿瘤细胞Ｋ５６２的作用,以及声参量和血卟啉浓度对瘤细胞杀伤率的影响。结果表明,声参量和血卟啉浓度与瘤细胞杀伤率呈正相关。     

超声激活血卟啉诱导艾氏腹水瘤细胞凋亡的细胞学研究

采用频率为1.34 MHz、声强为1w/cm2的超声结合血卟啉对EAT细胞凋亡模式进行了研究,探讨了声动力学疗法抗肿瘤的分子机制.超声激活血卟啉作用于EAT细胞后,不同时间点取材,通过扫描电镜观察EAT细胞的形态学变化;通过HO荧光染色观察凋亡细胞的形态学特征;利用免疫细胞化学方法检测caspase-8蛋白的活性变化.结果表明,超声激活血卟啉可诱导EAT细胞凋亡的发生,并且随时间的延迟凋亡现象愈加明显;免疫细胞化学方法表明超声处理后caspaSe-8蛋白表达活性显著增强,且于1h活化程度达到最高.研究表明,超声激活血卟啉可诱导EAT细胞凋亡,其作用的分子机制可能涉及Caspase-8依赖的膜受体凋亡信号调节通路.     

低强度超声激活血卟啉对S180细胞的杀伤作用

为探讨低强度超声激活血卟啉对在体S180肉瘤细胞的杀伤作用，对荷瘤小鼠采用声动力疗法处理，分别从癌组织生长状况、显微结构及超微结构等方面进行研究。结果表明：超声激活血卟啉对肿瘤生长的抑制作用明显大于其他实验组，癌细胞在处理后的不同时间段，其显微结构及超微结构均表现出不同程度的损伤。     

聚焦超声激活血卟啉对在体S180肿瘤细胞的抑制作用研究

目的 研究频率为2.2MHz的聚焦超声结合血卟啉对在体S180肿瘤组织的杀伤作用.方法 计算不同处理后对肿瘤组织的生长抑制作用,并通过透射电镜观察处理后不同时间段取材S180实体瘤超微结构的变化.结果 单纯血卟啉对在体S180肿瘤细胞几乎没有生长抑制作用;单纯超声对S180肿瘤组织有一定的生长抑制作用,且随着超声强度的增加,抑制效应逐渐显著,而超声结合血卟啉所产生的协同效应对S180肿瘤细胞的生长抑制作用明显高于单纯超声组,电镜下观察到超声激活血卟啉可以破坏肿瘤细胞的超微结构,尤其是对肿瘤细胞膜和膜性细胞器的通透性和结构的损伤,并且随着取材时间的延长,损伤效应进一步加强.结论 超声结合血卟啉能有效地抑制S180肿瘤的生长作用.     

超声波激活血卟啉抗肿瘤效应机理研究

研究了活性净化剂组氨酸和甘露醇对超声波激活血卟啉杀伤人体黑色素瘤细胞LiBr的抑制作用，探讨了声动力学方法抗肿瘤效应的机理，实验结果表明，加强氨酸时，单纯超声对瘤细胞LiBr杀伤率部分被抑制，而超声加血卟啉抗肿瘤效应则几乎全被抑制。甘露醇对超声和超声加血卟啉对细胞杀伤效应均无影响，这说明单线态氧是杀伤肿瘤细胞的主要因素。     

超声激活血卟啉杀伤癌细胞的扫描电镜观察

利用频率为2MHz,强度为0．9W／cm^2的超声(Ultrasound,US)激活血卟啉(Hematoporphyrin deriVatives,HpD)对在体的腹水型艾氏腹水瘤细胞(Ehrlich Ascites Tumor,EAT)和S180(Sarcomal80,S180)细胞进行抑癌作用研究。通过扫描电子显微镜观察处理后细胞形态的变化,结果表明：超声激活血卟琳对艾氏腹水瘤细胞和S180细胞均有明显的杀伤效果,且通过对损伤不同形态的比较,得出S180细胞膜较艾氏腹水瘤细胞膜对于声动力疗法(Sonodynamic Therapy,SDT)更为敏感。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that