IMAGING SCIENCE AND PHOTOCHEMISTRY

2018, 36(2): 0-0.

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Photo-responsive Surfaces for Cell Adhesion

HAO Yuwei, LIU Hongliang, WANG Shutao

2018, 36(2): 117-129. DOI: 10.7517/j.issn.1674-0475.2018.02.001

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Responsive process of photo-responsive molecules can be modulated by external stimuli, like wave length, light intensity and exposure time. Recently, smart surfaces based on photo-responsive molecules (such as azobenzene, spiropyran and their derivatives) have been adopted to manipulate cell adhesion. Photo-isomerization of these molecules can change the physicochemical properties of surfaces, which can induce cell adhesion and detachment. Design of photo-controlled surfaces provides a novel strategy to investigate cell adhesion, migration, and diagnosis.

Microwave-sensitive mPEG-PLGA Embolic Microspheres for Hepatocellular Carcinoma Therapy

TANG Shunsong, FU Changhui, HUANG Zhongbing, MENG Xianwei

2018, 36(2): 130-136. DOI: 10.7517/j.issn.1674-0475.2018.02.002

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In this paper, mPEG-PLGA microspheres with microwave sensitivity and good biosafety were prepared by double emulsion method for the treatment of hepatocellular carcinoma. The microspheres showed a uniform monodisperse with an average size of about 63 μm. Compared with saline, the microspheres coated with MoS₂ nanosheets dispersed in saline can be increased by 8.5℃ under microwave irradiation. For the subcutaneous H22 tumor of ICR mice, the ablation rate of tumor was 100% under microwave irradiation. For VX-2 liver orthotropic transplantation tumor in New Zealand white rabbits, the DSA images showed that the tumor and peripheral blood vessels disappeared rapidly after the hepatic arterial embolization, indicating the microspheres had a good embolization effect. 6 days after ablation, the necrosis diameters of the tumor in the two directions were 15.76 and 21.85 mm, respectively, compared with the microwave group (11.18 and 11.78 mm).

Applicability Verification of RFM Model in Aerial Remote Sensing Image Optimization

XU Chunxue, CHEN Rui, ZHAO Hongying

2018, 36(2): 137-148. DOI: 10.7517/j.issn.1674-0475.2018.02.003

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Aiming at the limitation of the practical application situation based on the collinear equation, the rational function model (RFM) for aerial image resolution and the effectiveness of its solution in aerial image are studied and explored. The RFM is given a systematic explanation from the aspects of the definition and characteristic of the model and its solution. The fitting accuracy between RFM and classic bundle adjustment is also analyzed. Based on the triangulation measurement results of collinearity method, the experimental result proves the good performance of RFM compared with classic collinearity method. The results show that the rational function model can fit the bundle adjustment with high precision, and it can replace the classical model that based on the strict collinear equation to complete the task of aerial triangulation, thus providing a theoretical reference for the application of RFM in close-range images such as unmanned aerial vehicles.

Effect and Mechanism of Photo-induced Hemoglobin Kinetics Reaction with Free Cysteine

CAO Hongyu, SHI Fei, TANG Qian, WANG Lihao, ZHENG Xuefang

2018, 36(2): 149-160. DOI: 10.7517/j.issn.1674-0475.2018.02.004

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Hemoglobin (Hb) is a respiratory protein with cyclic conjugated structure, which can absorb light at specific wavelengths and influence the expression of hemoglobin by the structural changes. It was found that the ultraviolet light irradiation could influence the structural changes of Hb, and added free cysteine contributes to the structure stability of methemoglobin (metHb) in irradiation experiment. Irradiated by 266 nm laser,metHb, deoxyhemoglobin(deoxyHb), oxyhemoglobin(HbO₂) and carboxyhemoglobin(HbCO) are excited to their excited states, and the decay processes to the ground state indicated with their corresponding Soret band peak have almost the same time. After adding free cysteine, the electron of cysteine can directly or indirectly transfer to iron porphyrin with the variation of the decay time of excited state iron porphyrin. The significant prolongations of decay time are observed on the photo-irradiated metHb, HbO₂ and HbCO, while slight influences are detected on the photo-irradiated deoxyHb. According to transient absorption spectroscopy, kinetic curves and UV-Vis spectra, while the four forms of hemoglobin are excited to the excited state, their iron porphyrin is reacted to the state of six-coordinated planar structure with one empty coordination position.

Hydrothermal Synthesis of α-NaYF₄: Ce³⁺/Tb³⁺ Nanospheres with High Fluorescence Properties

TAO Pingfang, FENG Yuqin, ZHOU Neng, QIN Liqin, ZHANG Pei

2018, 36(2): 161-170. DOI: 10.7517/j.issn.1674-0475.2018.02.005

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Cubic phase (α-)NaYF₄:Ce³⁺/Tb³⁺ nanospheres with high fluorescence properties was synthesized by hydrothermal method using sodium potassium tartrate(C₄O₆H₄KNa) as raw materials and assistant agent. The structure and fluorescence properties of the samples were characterize by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser particle sizer,fluorescence spectrophotometer (FL) and fourier transform infrared spectrometer (FTIR). The results of XRD indicate that the synthesized NaYF₄:Ce³⁺/Tb³⁺, adding with different quantities of potassium sodium tartrate, appeared different phase. The phase of product is mixed with cubic and hexagonal phase, and easily transformed to pure cubic phase or mixed with cubic and hexagonal phase again, and pure hexagonal phase finally, as the dosage of potassium sodium tartrate increases. SEM images show that the mixed phase of the NaYF₄:Ce³⁺/Tb³⁺ appear two different morphologies, namely hexagonal prism micro-rod and nanosphere, and the cubic phase is only nanosphere about 100 nm in diameter. Sodium potassium tartrate plays an important role in the morphology control. The fluorescence display the green light emission of the synthesized NaYF₄:Ce³⁺/Tb³⁺ peak at 543 nm mainly from the transition of Tb³⁺ between ⁵D₄-⁷F₅, under the excitation of 290 nm light. The fluorescence intensity of the pure α-NaYF₄:5%Ce³⁺/5%Tb³⁺ by solvothermal treatment at 180℃ for 24 h, with the dosage of potassium sodium tartrate as 1.2 g, was significantly higher than that of the mixed phase(α+β) NaYF₄:Ce³⁺/Tb³⁺ or pure hexagonal phase (β-) NaYF₄:Ce³⁺/Tb³⁺.

Photocatalytic Degradation of Gaseous CH₂O over ZnO Nanoparticles

LI Ling, DU Yunshu, WANG Xuan, HAN Jian, WANG Chuanyi

2018, 36(2): 171-177. DOI: 10.7517/j.issn.1674-0475.2018.02.006

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Nanosized ZnO particles have been synthesized by sol-gel method and studied for photocatalytic activities toward gaseous CH₂O degradation. It was found that CH₂O adsorbed on ZnO nanoparticles can be oxidized to CO₂ under UV light irradiation with the coexistence of either O₂ or H₂O. However, different from aqueous condition where H₂O molecules are first oxidized to be free radicals then react with CH₂O, direct photoactivation of O₂ becomes the dominant step in promoting photocatalytic degradation efficiency of gaseous CH₂O. The results reveal a new reaction mechanism that can be important for further modification of photocatalyst for gaseous CH₂O degradation.

A Turn-on Fluorometric Sensor for Al³⁺ in Aqueous Medium with Cell Imaging Application

FENG Jia, YU Fang, WANG Yu

2018, 36(2): 178-186. DOI: 10.7517/j.issn.1674-0475.2018.02.007

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Based on the inhibition of C=N isomerization and chelation-enhanced fluorescence (CHEF), the simple Schiff base 1-(2-pyridylmethyleneimino) naphthalen-2-ol (L) acts as an effective fluorometric sensor for Al³⁺ in buffered semi-aqueous medium. L exhibited selective fluorescence enhancement upon binding Al³⁺as a detection response, which giving strong blue emission (438 nm). The sensitivity of the fluorescent based assay (80.5 nmol/L) for Al³⁺ is far below the limit recommended in the World Health Organization (WHO) guidelines for drinking water (7.41 μmol/L). L was successfully applied to detect intracellular Al³⁺ in human SiHa cells through fluorescence microscopic imaging. The interaction between the sensor and Al³⁺ has been investigated in detail by NMR and HRMS analysis.

Study on Denoising Technology to Reproduction Image Detail

WU Yumin, DUAN Haiyan, WEN Yongfu, CHENG Haobo, WANG Tan

2018, 36(2): 187-191. DOI: 10.7517/j.issn.1674-0475.2018.02.008

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In order to eliminate speckle noise in digital holographic reconstructed image, a denoising method based on edge detection anisotropic diffusion equation (PM) is proposed. The diffusion process is guided by the edge detection operator instead of the gradient operator. The edge detection operator is less sensitive to noise, and can better recognize the edge information of reconstructed image. Compared to median filtering, mean filtering, wavelet transform filtering algorithm of peak signal-to-noise ratio (PNSR), the experiments show that the proposed algorithm has better denoising effect, and can effectively protect the details of the image in the process of denoising.

Preparation and Properties of Temperature-sensitive Paints Based on Probe Molecules from Phenanthroline Terbium with Different Ligands

SUN Mengting, LU Siyu, SUN Jing, WANG Yuan, YU Wensheng, CUI Siyuan

2018, 36(2): 192-199. DOI: 10.7517/j.issn.1674-0475.2018.02.009

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Probe molecules of Tb(MAA)₃ Phen, Tb(Sal)₃ Phen and Tb(CA)₃ Phen were prepared by using terbium oxide (Tb₂O₃), methacrylate (MAA), salicylic acid (HSal), cinnamic acid (HCA) and phenanthroline (Phen). A series of temperature sensitive paints were obtained by the polymerization of different probe molecules, methyl methacrylate(MMA) and the initiator of benzoyl peroxide(BPO). The structure, morphology, luminescence property of probe molecules and the temperature quenching property of temperature sensitive paints were characterized by infrared spectrometer, fluorescence spectrometer and scanning electron microscopy. The effect of different ligands on the luminescence property of probe molecules and the temperature quenching property of temperature sensitive paints were studied. It is indicated that Tb³⁺ and primary ligands were coordinated and Phen was involved in. It is demonstrated that terbium with phenanthroline ternary complex of MAA as primary ligand has the best luminous performance. Temperature sensitive paints have favorable temperature quenching properties at the temperature range of 25-65℃ is illustrated. It is analyzed that the temperature sensitive paint based Tb(MAA)₃ Phen has a better application value comprehensively.

Synthesis and Properties of a Novel Benzophenone Photoinitiator

YIN Xiangxiang, WANG Lei, NIE Jun, YANG Jinliang

2018, 36(2): 200-209. DOI: 10.7517/j.issn.1674-0475.2018.02.010

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In this paper, 4-(bromomethyl) benzophenone was synthesized from 4-methylbenzophenone. Then, a new type of photoinitiator (MBPBP) containing benzophenone structure was synthesized by using 4-hydroxybenzophenone and 4-(bromomethyl) benzophenone as raw materials. The structure was determined by ¹HNMR spectroscopy. The UV absorption and photodegradation properties were studied by UV absorption spectroscopy. The effect of photoinitiator concentration, light intensity and reaction monomer on photopolymerization was analyzed by RT-FTIR. The results show that the molar extinction coefficient of MBPBP is about 1.5 times of that of benzophenone, and the absorption range is increased to 300 nm. The light absorption efficiency is much higher than that of the traditional benzophenone. It is a kind of efficient photoinitrogenation agent.

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