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Microporous Hypercross-linked Conjugated Quinonoid Chromophores of Anthracene: Novel Polymers for CO_2 Adsorption

Chinese Journal of Polymer Science 2015年第2期33卷 224-235页

作者： Rajangam Vinodh Mani Ganesh Mei Mei Peng Aziz Abidov Muthiahpillai Palanichamy wang seog cha Hyun-Tae Jang Department of Chemical Engineering Hanseo University Korea Carbon Capture and Sequestration R and D Centre School of Civil and Environmental Engineering Kunsan National University

Microporous hypercross-linked conjugated quinonoid chromophores represent a novel class of amorphous polymers, synthesized by the reaction of anthracene with dimethoxy methane in the presence of FeCl3 catalyst. Their N2 adsorption isotherms confirm their microporous nature. Diffuse reflectance UV-Visible（DRS UV-Vis） spectroscopy confirms their matrix built with the conjugated quinonoids by their broad light absorption characteristics extending from 1000 nm to 200 nm with the absorbance maximum close to 400 nm. The catalyst cross-linked anthracene with ―CH2― bridges and subsequently dehydrogenating them to form quinonoids. Their Fourier transform infrared（FTIR） spectra showed their characteristic quinonoid vibrations between 1600 and 1700 cm-1. The synthesis of polymers was carried out at 30, 40, 50, 60, 70 and 80 ℃, but the quinonoid content of the polymer obtained at 80 ℃ was higher than that of the others. Their scanning electron microscopy（SEM） images showed microspheres of 1 to 5 μm size built with tiny particles. Their surfaces were not smooth. The polymer synthesized at 80 ℃ showed 5.1 wt% CO2 sorption at 25 ℃ and 0.1 MPa, but when it was recross-linked, the CO2 sorption increased to 8 wt%. Hence, hypercross-linked conjugated quinonoid chromophores of anthracene are good for sorption of CO2.

关键词： Anthracene Hypercross-linked polymers CO2 adsorption Friedel-Crafts reaction Quinonoid chromophores

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Whitening Effect of Storage Protein 2 from Silkworm Hemolymph

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Advances in Bioscience and Biotechnology 2014年第9期5卷 758-767页

作者： Z-Hun Kim Jung Wook Hwang Joon Ho Lee Hojin Kim Dae-seog Lim Sangjin Kang Heui Sam Lee Yong-Soo Choi Department of Applied Bioscience CHA University Seongnam Korea Sericultural & Apicultural Materials Division National Academy of Agricultural Science RDA Suwon Korea

This study investigated the effects of silkworm hemolymph-derived storage protein 2 (SP2) on the whitening process in mouse B16F1 melanoma cells. After the cells were treated with various concentrations of SP2 (0.1 - 1.0 mg/mL), cytotoxicity, melanin contents, and differences in mRNA and protein expression associated with melanogenesis were observed. No cytotoxicity was observed when cells were treated with SP2, even with increased SP2 concentrations of up to 2.0 mg/mL. When treated with various SP2 concentrations in the cells, the protein and mRNA expression of tyrosinase were dose-dependently decreased, respectively, and inhibition of tyrosinase was further increased by 50.0% with increasing SP2 concentration of 1.0 mg/mL. Expression mRNAs coding tyrosinase related protein-1 and protein-2 (TRP-1 and TRP-2) was also significantly decreased in a dose dependent manner. When measuring the melanin content in melanoma cells, SP2 at 1 mg/mL inhibited melanin synthesis by 73.5% compared with non-treated cells. The inhibitory effect was 2.8-fold higher than that obtained using arbutin as a positive control. This study demonstrates that SP2, as a whitening material, is capable of suppressing melanin synthesis through the downregulation of proteins and genes in the melanin biosynthesis pathway.

关键词： Silkworm Hemolymph Storage Protein 2 Melanin Tyrosinase Melanoma Cells

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Two distinct stem cell-like subtypes of hepatocellular carcinoma with clinical significance and their therapeutic potentials

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Cancer Communications 2022年第2期42卷 179-183页

作者： Sung Hwan Lee Yun Seong Jeong Sunyoung Lee Bo Hwa Sohn Ho Kyoung Hwang Gi Hong Choi chang Moo Kang Jin Sub Choi Woo Jung Lee Jae-Ho Cheong Hee Jin Jang Ahmed Kaseb Lewis Roberts Sun Young Yim Yun Shin Chun Ju-seog Lee Department of Systems Biology the University of Texas MD Anderson Cancer CenterHoustonTX 77030USA Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryYonsei University College of MedicineSeoul 03722Republic of Korea Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryCHA Bundang Medical CenterCHA UniversitySeongnam 13496Republic of Korea Department of GI Medical Oncology The University of Texas MD Anderson Cancer CenterHoustonTX 77030USA Department of Surgery Yonsei University Health SystemYonsei University College of MedicineSeoul 03722Republic of Korea Division of Thoracic Surgery Michael E.DeBakey Department of SurgeryBaylor College of MedicineHoustonTX 77030USA Division of Gastroenterology and Hepatology Mayo ClinicRochesterMN 55902USA Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University College of MedicineSeoul 02841Republic of Korea Department of Surgery The University of Texas MD Anderson Cancer CenterHoustonTX 77030USA

Dear Editor Hepatocellular carcinoma(HCC)is among the most com-mon cancers worldwide,causing about 600,000 deaths annully[1].In HCC,stem cell-like characteristics,which drive early recurrence and therapy resistance,are major contributors to poor prognosis[2].In this current study,we integrated and analyzed gene expression data from human fetal liver cells and primary HCC tumors(n=1231)*** two clinically and biologically distinct hepatic stem cell(HS)subtypes,potential biomarkers associated with these subtypes,and a potential new therapeutic inter-vention for these subtypes.

关键词： therapeutic subtypes prognosis

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