Solidification process of conventional superalloy by confocal scanning laser microscope

The solidification process of a conventional superalloy, IN718, was investigated by confocal scanning laser microscope （CSLM）. The liquid fraction during solidification was obtained as a function of real time and temperature in reference with the in-situ observation. The characteristics of L→γ transformation were analyzed and the γ growing rate of each stage was also calculated. Scheil equation was employed to predict the segregation behavior, and the predict results are in consistence with the experimental results. As a result, the confocal scanning laser microscope shows a great potential for solidification process research.

Confocal Laser Scanning Microscope Evaluation of Early Bacterial Colonization on Zirconium Oxide and Titanium Surfaces:An in vivo Study

To investigate the bacterial colonization on zirconium oxide and titanium surfaces in vivo quantitatively using a confocal laser scanning microscope （CLSM）. Ten samples of zirconium oxide ceramic and commercially pure titanium were fabricated and polished using silicon carbide abrasive paper. One sample from each group was evaluated topographic pattern under a scanning electron microscope. One sample from each group was to evaluate roughness using a profilometer. Eight volunteers were selected. The samples were cemented at the buccal surfaces of upper first molars. All samples were removed after 48 hours, immersed in SYTO-9 and propidium iodide fluorescent to stain for adherent bacteria and obseIved with CLSM. Fewer bacteria were observed in zirconia group than titanium group. However, there was no statistical difference between two groups. The experimental results demonstrate that zirconium oxide may be considered as a promising material for dental implant abutments.

Quantum Dots as Fluorescent Labels for Detection of Heat Shock Protein in Tumor Tissue Using Laser Scanning Confocal Microscope

A new Quantum Dots（Qdots） nanocrystal composed of semiconductor core and zinc sulfide shell, and its feasibility as labels in immunofluorescence analysis for the imaging of tumor biomarkers by laser scanning confocal microscope（LSCM） was investigated. Qdots taged by mercaptoacetic acid were conjugated with second antibody, then imaging differences of Heat Shock Proteins 70（HSP70） in renal carcinoma tissure sections with immunofluorescence analysis method using Qdots bioconjugates and conventional organic dye FITC were observed by LSCM to assess the brightness and opticalstability of Qdots. The experimental results showed Qdots bioconjugates achieved the better results in demonstrating HSP70 with more brighter color and more clear picture than FITC labels. Moreover, the label signals of Qdots did not fade clearly after continued exposure to a 488 nm laser for 1 h. The Qdots bioconjugates have good feasibility in immunofluorescence analysis for the bioimaging by LSCM.

Qualitative analysis of re mineralized carious lesions subjected to fluoride supplement through confocal laser scanning microscope

Aim: 1] Comparative evaluation of the linear depth of induced remineralized lesions after subjecting to fluoride supplements and 2] To assess the average fluorescence at both the demineralized and the remi-neralized zones in all the three study groups under confocal laser scanning microscope. Method: Forty five sound human premolars extracted for orthodon-tic reasons were decoronated 1 mm below the ce-mento-enamel junction and coated with nail varnish except for a 3 × 3 mm window on the buccal surface. The samples were placed in 50 ml of de mineralizing solution at pH 4.6 for 96 hours. Following deminera-lization, the lower half of the 3 × 3 mm window in all the samples were covered with nail varnish to serve as control. The samples were randomly divided into three groups of fifteen teeth each (n = 15) and speci-mens in group A[Nfd] were remineralized using non-fluoridated dentifrice [control], those in groups B [Fd5] and group C [Fd10] using 500 ppm and 1000 ppm of fluoride containing dentifrice, respectively. The specimens were subjected to a 20 day reminera-lization treatment regimen and were sectioned into 100 μm thick sections and two images were captured on the buccal surface from either side of the midpoint of occluso-cervical length using confocal laser scan-ning microscope [CLSM]. Results: were tabulated and statistically analyzed by Anova. Study concluded that 1000 ppm fluoridated dentifrice showed a greater degree of remineralization than other groups and confocal laser scanning microscopes gives promising results in the diagnosis of early enamel lesions over the conventional methods.

In situ observation of the dissolution kinetics of Al_(2)O_(3) particles in CaO–Al_(2)O_(3)–SiO_(2) slags using laser confocal scanning microscopy

The dissolution kinetics of Al_(2)O_(3) in CaO-Al_(2)O_(3) SiOslags was studied using a high-temperature confocal scanning laser microscope at 1773 to 1873 K.The results show that the controlling step during the Al_(2)O_(3) dissolution was the diffusionin molten slag.It was found that the dissolution curves of Al_(2)O_(3) particles were hardly agreed with the traditional boundary layer diffusion model with the increase of the CaO/Al_(2)O_(3) ratio of slag.A modified diffusion equation considering slag viscosity was developed to study the dissolution mechanism of Al_(2)O_(3) in slag.Diffusion coefficients of Al_(2)O_(3) in slag were calculated as 2.8×10to 4.1×10m~2/s at the temperature of 1773-1873 K.The dissolution rate of Al_(2)O_(3) increased with higher temperature,CaO/Al_(2)O_(3),and particle size.A new model was shown to be v_(Al_(2)O_(3))=0.16×r_(0)^(1.58)×x^(3.52)×(T-T_(mp))^(1.11)to predict the dissolution rate and the total dissolution time of Al_(2)O_(3) inclusions with various sizes,where vAl_(2)O_(3) is the dissolution rate of Al_(2)O_(3) in volume,μm^(3)/s;x is the value of CaO/Al_(2)O_(3) mass ratio;R_(0) is the initial radius of Al_(2)O_(3),μm;T is the temperature,K;T_(mp) is the melting point of slag,K.

Simultaneous multi-parameter observation of Harring-tonine-treating HL-60 cells with both two-photon and confocal laser scanning microscopy

Harringtonine (HT), a kind of anticancer drug isolated from Chinese herb-Cephalotaxus hainanensis Li, can induce apoptosis in promyelocytic leukemia HL-60 cells. With both two-photon laser scanning microscopy and confocal laser scanning microscopy in combination with the fluores-cent probe Hoechst 33342, tetramethyrhodamine ethyl ester (TMRE) and Fluo 3-AM, we simulta-neously observed HT-induced changes in nuclear morphology, mitochondrial membrane potential and intracellular calcium concentration ([Ca2+]i) in HL-60 cells, and developed a real-time, sensitive and invasive method for simultaneous multi-parameter observation of drug- treating living cells at the level of single cell.

Using laser confocal scanning microscope to study ischemia-hypoxia injury in rat brain slice

The level of lipid peroxidation and cellular necrosis in rat living brain slices during brain ischemia-hypoxia injury have been observed using a laser confocal scanning microscope (LCSM) with double labeling of fluorescent probes D-399 (2, 7-dichlorofluorescin diacetate) and propidium iodide (Pl). The hypoxia and/or reoxygenation injury in rat brain slices is markedly decreased by pretreatment with L-NG-nitro-arginine (L-NNA) and N-acetylcysteine (NAC), showing that the nitric oxide (NO) and other free radicals play an important role in brain ischemia-hypoxia injury.

Dispersion of particles in the coatings characterized by laser scanning confocal micrscopy(LSCM) I:Vertical dispersion of particles in the coatings and the weathering property studied by orthogonal analysis method of LSCM

Two kinds of TiO2 filled epoxy coatings were designed and prepared to obtain pigments with different dispersion degrees of TiO2 particles.Laser scanning confocal microscope（LSCM）was used to investigate both the horizontal and vertical distributions of TiO2 particles in the coatings.The results indicated that TiO2 in the two samples shared considerable similarity in horizental dispersion,but exhibited great difference in vertical dispersion.TiO2 showed uniform vertical distribution in disp coating,wheras a gap about 1.1μm was found in the non-disp coating,which significantly influenced the surface optical properties of the coatings during weathering.Based on the confocal data,the model of dispersion of pigments in the coatings was proposed and the change of surface properties during weathering was predicted:the surface optical properties showed an initial decrease followed by a subsequent increase,which was in good agreement with the weathering data.

激光扫描共聚焦显微镜LSM900 with Airyscan2的管理模式探索

激光扫描共聚焦显微镜是生物、医药、化学等科学领域成像研究的一个重要工具,也是目前大型仪器平台不可或缺的成像设备。LSM900 with Airyscan2是目前市面上较新的一款多功能、快速、高分辨率的激光扫描共聚焦显微镜。对激光扫描共聚焦显微镜的原理、其运行的环境要求、管理人员职责、开放共享管理以及设备维护保养注意事项几方面做详细地介绍,供相关管理人员与使用者参考。

枯草芽孢杆菌无细胞上清液抑制单增李斯特菌生物被膜形成的研究

单增李斯特菌(Listeria monocytogenes)是一种常见的食源性致病菌,其生物被膜是导致食品污染和疾病传播的重要原因。该研究选用枯草芽孢杆菌(Bacillus subtilis)无细胞上清液(cell free supernatant,CFS)作为抑制剂,探究B.subtilis CFS在抑制L.monocytogenes野生菌株118(以下简称No.118)生物被膜方面的作用和潜力。首先测定了B.subtilis CFS的最小抑菌浓度(minimum inhibitory concentration,MIC),接着采用结晶紫染色法测定了不同亚最小抑菌浓度下B.subtilis CFS对No.118的生物被膜抑制率,发现不同亚抑菌浓度下的CFS对No.118生物被膜均具有显著的抑制作用,且在1/64 MIC时生物被膜抑制率仍可达到47%;同时B.subtilis CFS对No.118生物被膜代谢活性、自聚集率、表面疏水性、群集泳动能力和膜外聚合物分泌也均有显著抑制作用;最后,通过激光共聚焦显微镜观察了在CFS作用下,No.118生物被膜结构和细胞分布的变化规律,经CFS处理后,No.118生物被膜结构松散,细菌数量明显减少。综上,B.subtilis CFS可通过影响No.118生物被膜细胞的代谢活性、自聚集能力和群集泳动能力以及膜外聚合物的分泌来抑制其生物被膜形成,对探究益生菌代谢产物作为生物被膜抑制剂方面的应用具有重要的参考价值。

激光共聚焦显微镜应用于本科生的实验教学设计

激光共聚焦显微镜等大型仪器的实验教学是实现“新工科”建设的重要推动力,然而目前针对本科生的大型仪器教学却未得到有效普及。通过选取适合于本科生实践操作的微生物荧光染色观察实验以及基于“雨课堂”进行线上线下教学,发挥激光共聚焦显微镜可视化强的特点,激发本科生的求知欲望和探索热情,增强学生的主观能动性,促进以教师为主导向以学生为中心的教学模式转变。实践教学表明,易于操作、可视化强的实验方案有助于学生理解和掌握激光共聚焦显微镜相关的基础知识和未来应用,拓宽学生的知识面和科研视野,提高本科生的实践创新能力。

尼康共聚焦显微镜使用的大数据分析

激光共聚焦显微镜是目前最精密的光学成像仪器,是生命领域重要的研究工具。兰州大学生命科学研究实验中心的尼康共聚焦显微镜两年多时间工作了1万多小时,获取了大量的观测数据。对使用记录的分析表明,仪器在每天上午9点到晚上22点处于饱和工作状态,只有在寒假期间有所降低,说明了全天候开放使用的必要性。观测结果分析得到了很多有价值的信息,例如,488 nm和561 nm激光器使用率都超过了三分之一,单激光和双激光观测占比分别是72%和24%,高灵敏检测通道使用率接近90%等。综合这些信息,可以为共聚焦显微镜的管理和培训提供科学的依据。

激光共聚焦显微镜荧光漂白后恢复实验的制样优化

利用激光共聚焦显微镜进行荧光漂白后恢复(FRAP)实验为研究分子的流动性提供了新的手段。然而,在拟南芥根毛细胞中进行荧光漂白后恢复实验时,由于拍摄时长的影响经常会导致样品脱离原来的焦平面,从而无法获得可靠的数据。以拟南芥根尖为材料,通过实验比较激光共聚焦显微镜下的常规制片、指甲油封片以及甘油制片,结果表明,利用指甲油封片能更好地解决样品离焦问题,可以获取有效的实验数据。

Cr含量对1000 MPa级高强钢熔敷金属组织演变的作用机制

设计开发了5种不同Cr含量的1000 MPa级高强钢埋弧焊材,采用丝极埋弧焊制备了Cr含量为0%~0.9%的熔敷金属,利用OM、SEM、TEM和CLSM等微观组织表征方法研究Cr含量对1000 MPa级高强钢熔敷金属组织演变的影响,并通过拉伸和冲击试验评估其力学性能.结果表明,1000 MPa级高强钢熔敷金属随着Cr含量提高,铁素体转变起始温度由723.3℃提高到740.2℃,贝氏体转变起始温度由470.2℃降低到458.5℃,铁素体转变温度区间扩大,高Cr熔敷金属中贝氏体转变速率较快,熔敷金属中针状铁素体和贝氏体铁素体增加,M-A组元由弥散分布逐渐呈链条状偏聚,先共析铁素体与残余奥氏体减少.熔敷金属冲击断裂形式由低Cr的韧性断裂向高Cr的准解理断裂转变,熔敷金属拉伸强度不断提高,相比于无Cr的熔敷金属,0.9%Cr的熔敷金属抗拉强度和屈服强度分别提高12.4%和17.0%,熔敷金属冲击吸收能量先提高后降低,在−40℃条件下,0.6%Cr的熔敷金属的低温韧性最高为84 J,熔敷金属Cr含量为0.6%时强韧性匹配效果最佳.

CLMS观察iRoot BP Plus对根尖倒充填封闭效果的体外研究

目的:观察iRoot BP Plus作为根尖倒充填材料封闭根尖的效果。方法:选取上下颌单直根管离体牙60颗,Reciproc blue机用单支镍钛锉预备根管,热牙胶连续波技术充填根管,超声工作尖对离体牙根尖区行倒预备。将离体牙随机分为三组,分别以iRoot BP Plus、MTA、3MZ350树脂行倒充填。体式激光共聚焦扫描显微镜观察倒充填后材料及牙体组织的颜色变化率。上述标本再次随机分为两个亚组,分别浸泡于2%亚甲基蓝溶液和1 g/L罗丹明B荧光染料中,48 h后分别在光学显微镜、扫描电镜和激光共聚焦显微镜下测量染料线性渗漏长度;测量材料与牙本质间的微间隙宽度,观察不同倒充填材料与根管壁间的微观结合形态;计算分析根尖区微渗漏荧光染色面积。通过定性和定量的方法研究不同倒充填材料对根尖封闭性能的影响。结果:iRoot BP Plus组倒充填后未发生明显颜色改变,美观性优于MTA组(P<0.05),但与树脂组比较差异无统计学意义(P>0.05)。iRoot BP Plus组染料渗漏长度较MTA组短(P<0.05),和MTA组染料渗漏长度比较差异无统计学意义(P>0.05)。三组微间隙宽度比较,iRoot BP Plus组<MTA组<树脂组(P<0.05)。三组微渗漏荧光染色面积比较,iRoot BP Plus组<MTA组<树脂组(P<0.05)。结论:iRoot BP Plus具有良好的根尖封闭性、密合性和美观性。

激光共聚焦显微镜样本制备在研究生实验教学中的应用

激光共聚焦显微镜是一种多功能、高分辨率、高效率的光学设备,在植物细胞结构中通过荧光探针标记相关基因,获得清晰的亚细胞定位信息,如细胞膜、细胞器等结构。以烟草为实验材料,在研究生实验教学中利用LSCM880激光扫描共聚焦显微镜观察烟草下表皮细胞,通过优化样本制作,最终获取清晰的图片。通过实验教学,学生掌握激光共聚焦显微镜的原理、样品制备及操作步骤,提高理论知识与实践操作相结合的能力,加强其对激光共聚焦显微镜的掌握及运用。

激光扫描共聚焦显微镜研究储层孔隙结构

这是一项首次应用激光扫描共聚焦显微镜 (LSCM)的激光荧光技术于油气储层的孔隙结构研究。供LSCM用的样品 ,用环氧树脂加入荧光剂后 ,经加压灌注 ,磨制成岩石薄片 ,在LSCM显微镜下观察孔喉的分布 ,可以测量面孔率 ,并可标出需要测量的每个孔喉的大小以及观察孔喉形状及分布状况。该法的优点 :1.可直接测量和观察到 2 μm左右大小的孔喉。 2 .在LSCM显微镜下可区分孔隙空间中的充填粘土杂基等 ,因此面孔率的测定较一般镜下统计和图像分析更为精确 ,因粘土矿物由于吸附染色剂后在颜色或灰度上有的不易区分。 3.岩石薄片中的微裂缝 ,在LSCM显微镜下可以更清楚地观察到。

葛根素对外周血内皮祖细胞数量和功能的影响

目的 :观察葛根素对外周血内皮祖细胞的影响。方法 :采用密度梯度离心法从外周血获取单个核细胞 ,将其接种在人纤维连接蛋白包被培养板 ,培养 7d后 ,收集贴壁细胞 ,加入不同浓度葛根素 (分别为 0 .1,0 .5 ,1,3mmol·L-1)培养一定的时间 (6 ,12 ,2 4 ,4 8h)。通过激光共聚焦显微镜鉴定FITC UEA Ⅰ和DiI acLDL双染色阳性细胞被认为是正在分化的EPC ,并在倒置荧光显微镜下计数。然后分别采用MTT比色法、改良的Boyden小室、黏附能力测定实验和体外血管生成试剂盒观察EPC的增殖能力、迁移能力、黏附能力和体外血管生成能力。结果 :葛根素显著增加外周血EPC数量 ,并且EPC数量随葛根素浓度增加及作用时间延长而增加 ,3mmol·L-1浓度葛根素作用 2 4h对EPC数量的影响最为显著 (较对照组增加了 1倍 ,P <0 .0 1)。葛根素也显著改善了外周血EPC的黏附能力、迁移能力、增殖能力和体外血管生成能力。结论

银杏叶提取物对外周血内皮祖细胞数量和功能的影响

目的 观察银杏叶提取物对外周血内皮祖细胞 (endothelialprogenitorcell,EPC)数量和功能的影响。方法 密度梯度离心法获取外周血单个核细胞 ,培养 7d后 ,收集贴壁细胞并加入银杏叶提取物 (10 ,2 5和 5 0mg·L- 1 )干预一定时间 (6 ,12 ,2 4和 4 8h)。激光共聚焦显微镜和流式细胞仪鉴定EPC ,分别观察EPC的增殖、迁移、粘附和体外血管生成能力。结果 银杏叶提取物促进外周血EPC扩增 ,2 5mg·L- 1 银杏叶提取物作用 2 4h对EPC数量的影响最为显著 (较对照组增加了 1倍 ,P <0 .0 1)。银杏叶提取物也显著改善了外周血EPC的粘附、迁移、增殖和体外血管生成能力。

利用激光扫描共聚焦显微镜观察同源四倍体水稻胚囊的形成与发育

激光扫描共聚焦显微镜是研究植物胚囊的形成与发育过程以及胚囊变异的理想工具。同源四倍体水稻是二倍体水稻染色体加倍形成的。本文利用激光扫描共聚焦显微镜直接观察经透明处理的水稻子房,研究加倍的基因剂量对于四倍体水稻的胚囊形成与发育的影响。结果表明,广陆矮4号四倍体大部分的胚囊形成与发育的过程基本是正常的,一部分胚囊出现异常现象,在成熟胚囊时期异常频率为10 61%;L202四倍体的异常频率较高,成熟胚囊时期异常频率达到45 65%。