荧光的二阶相干性研究

借助相干性等概念的阐述,结合荧光的产生机理、性质以及量子力学的相关原理,揭示了荧光的二阶相干性、相干函数及其相关性质,并分析讨论了它们之间的关系,     

太赫兹波段二维金属光子晶体传输器件的研究

运用频域有限元法研究了金属铜介质柱构成的二维光子晶体传输特性。通过改变铜柱形状和大小,研究了晶格常数为200μm的正方晶格光子晶体的TM模、TE模的禁带特性。选取金属铜为介质柱,空气为背景材料,对正方铜柱与旋转45度正方铜柱进行了大量计算与分析。结果表明,传输特性随着介质柱形状和填充率的变化而变化,且TE模和TM模带隙差异很大,波段并不相同,这为THz波段的光子晶体滤波器、反射器、极化器的开发与制作提供了理论依据。     

独立工作模式下的ADS774在X荧光分析仪上的应用

ADS774是一种带有内部采样保持电路的12位CMOS模拟/数字转换器,本文介绍了ADS774在独立工作模式下,数据分两次读出的新的使用方式及其在X荧光分析仪中的应用。     

铅电极在稀H_2SO_4中阳极行为的研究

应用热力学分析法和恒电位稳态极化曲线法研究了Pb电极在不同温度下于稀H2 SO4溶液中的阳极行为 ,讨论Pb电极致钝机理及致钝过程动力学     

An in vitro model mimicking the complement system to favor directed phagocytosis of unwanted cells

BackgroundOpsonization, is the molecular mechanism by which target molecules promote interactions with phagocyte cell surface receptors to remove unwanted cells by induced phagocytosis. We designed an in vitro system to demonstrate that this procedure could be driven to eliminate adipocytes, using peptides mimicking regions of the complement protein C3b to promote opsonization and enhance phagocytosis. Two cell lines were used: (1) THP-1 monocytes differentiated to macrophages, expressing the C3b opsonin receptor CR1 in charge of the removal of unwanted coated complexes; (2) 3T3-L1 fibroblasts differentiated to adipocytes, expressing AQP7, to evaluate the potential of peptides to stimulate opsonization. (3) A co-culture of the two cell lines to demonstrate that phagocytosis could be driven to cell withdrawal with high efficiency and specificity.ResultsAn array of peptides were designed and chemically synthesized p3691 and p3931 joined bound to the CR1 receptor activating phagocytosis (p < 0.033) while p3727 joined the AQP7 protein (p < 0.001) suggesting that opsonization of adipocytes could occur. In the co-culture system p3980 and p3981 increased lipid uptake to 91.2% and 89.0%, respectively, as an indicator of potential adipocyte phagocytosis.ConclusionsThis in vitro model could help understand the receptor–ligand interaction in the withdrawal of unwanted macromolecules in vivo. The adipocyte-phagocytosis discussed may help to control obesity, since peptides of C3b stimulated the CR1 receptor, promoting opsonisation and phagocytosis of lipid-containing structures, and recognition of AQP7 in the differentiated adipocytes, favored the phagocytic activity of macrophages, robustly supported by the co-culture strategy.How to cite: Bartsch IM, Perelmuter K, Bollati-Fogolin M, et al. An in vitro model mimicking the complement system to favor directed phagocytosis of unwanted cells. Electron J Biotechnol 2021;49. https://doi.org/10.1016/j.ejbt.2020.09.010.     

对线偏光反射后偏振态的讨论

根据菲涅耳公式,讨论了线偏振光在两种介质的分界面上反射时,反射光的偏振态与入射角、折射率、入射线偏振光矢量方向之间的关系．     

中国省会城市极化与扩散效应研究

本文基于增长极理论,利用1994-2009年中国28个省会城市市区与郊县的第二和第三产业的发展数据,综合运用相关分析与曲线拟合法,对各省会城市的极化效应与扩散效应进行了分析研究.分析结论显示,市区与郊县间区域差异程度并非遵照单个倒U模型,而是表现为多个倒U模型的叠加:市区第二产业当前正处于扩散阶段,而第三产业正处于资源汲取阶段;沿海、黄河中游和西南地区的省会城市发挥扩散效应或极化效应所需的区域梯度差明显低于其他区域等结论.     

Antinuclear Antibody Profiling in Patients of a Tertiary Care Centre in Central India

The incidence of autoimmune disorders that includes the connective tissue diseases has seen a rise in India in recent times. Antinuclear antibodies, the telltale sign of systemic autoimmune response, thus can be used as a screening tool and also to support the diagnosis of systemic autoimmune disease. The present retrospective cross- sectional analysis aimed to study the antinuclear antibodies profile (patterns and specific antibody reactivity) amongst suspected cases of auto-immune disorders at a tertiary care teaching hospital. The study retrieved and reviewed reports of 644 patients sent for ANA testing by indirect immunofluorescence assay over a period of 1 year by different specialty departments. Positive samples were further processed for anti-ds-DNA antibody and antibodies to extractable nuclear antigen. Data collected was statistically analysed. ANA pattern positivity was observed in 31% of cases and a positive antibody reactivity was seen in 66% of them. Female predominance (82%) was noted in both pattern positivity and antibody reactivity. High levels of pattern positivity and antibody reactivity was found in the young adults (45.9%). Amongst the ANA patterns, the nuclear homogenous pattern was found the commonest. The common antibodies associated with this pattern were anti-dsDNA and U1 Sm/RNP antibodies. A stronger fluorescence intensity on initial screening showed a higher confirmation rate for specific antibodies on immunoassay. High occurrence of positive ANA patterns in autoimmune disorders suggests its utilization as a screening tool for them and would also play an adjuvant to the diagnosis. Early knowledge about future autoimmunity will earn better prognostic achievements through better treatment interventions.     

亳州地区菊花中重金属含量的测定

采用石墨炉原子吸收法和火焰原子吸收法测定亳州地区菊花中铅、镉、铜的含量,采用原子荧光法测定砷、汞的含量。结果表明,亳州地区不同乡镇菊花中重金属含量有差异但均符合我国《药用植物及制剂进出口行业绿色标准》中重金属限量指标的规定。本实验检测亳菊花中重金属含量既为亳菊花的质量评价及其发展道地药材生产提供资料,同时也为提升亳菊花的声誉提供依据。     

Synthesis of CdSe quantum dots via paraffin liquid and oleic acid

This paper reported an efficient and rapid method to produce highly monodispersed CdSe quantum dots （QDs）, in which the traditional trioctylphosphine oxide （TOPO） was replaced by paraffin liquid as solvent and oleic acid as the reacting media. The experimental conditions and the properties of QDs had been studied in detail. The resulting samples were confirmed of uniform size distribution with transmission electronic microscopy （TEM）, while UV-vis absorption and photoluminescence （PL） spectra clearly indicated that such synthesized QDs had good fluorescence properties.