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Pd–Au nanoparticles supported by TiO2 fibers for catalytic NO decomposition by CO
Hyeon Ung Shin,Dinesh Lolla,Zhorro Nikolov,George G. Chase 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Pd–Au nanoparticles supported by TiO2 fibers were fabricated and assembled into a porous medium. The2–16 nm Pd–Au nanoparticles were randomly dispersed in the titania nanofibers (da = 117 68 nm). Xraydiffraction patterns and X-ray photoelectron spectroscopy verified the formation of Pd–Au particles. Binding energy shifts were detected due to chemical bonding and reduction with hydrazine monohydrate. The fiber media with Pd–Au nanoparticles had greater reactivity in conversion of NO and CO gases than Pdmonometallic catalyst alone, attributed to a lower activation energy of the reaction on the Pd–Au catalystparticles
공간점유간병소 및 췌병소에 대한 초음파 유도하 세침흡입 세포진에 관한 연구
양웅석(Ung Suk Yang),조중현(Joong Hyeon Cho),김영훈(Young Hoon Kim),강영진(Young Jin Kang),이강희(kang Hee Lee),허윤(Yun Huh),문한규(Han Kiu Moon),유방현(Bang Hyeon Liu) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.1
N/A Liver biopsy by Menghini technique has a relatively low sensitivity and high risk in diagnosing space occupying lesions of the liver. Moreover, any biopsy method except exploratory laparotomy has not been useful in pancreatic lesions. Recently ultrasonically guided percutaneous fine needle aspiration cytodiagnosis is widely used in evaluating space occupying lesions of the liver and deep-seated organ, such as pancrea, because of its high sensitivity, safety and simplicity. Ultrasonically guided percutaneous fine needle aspiration cytodiagnosis was carried out to evaluating its diagnostic performance in 20 patients with space occupying lesions of the liver and in 3 patients with pancreatic lesions who were admitted to the Pusan National University Hospital from Oct. 1985 to Jan. 1986. The results were as follows: 1) Clinically diagnosis before ultrasonically guided percutaneous fine needle aspiration cytodiagnosis were primary hepatoma in 16 patients, liver abscess in 2 patients, hepatic cyst in 2 pateints, pancreatic cancer in 2 patients. 2) The cytodiagnosis in space occupying lesions of liver were as follows: The 14 patients of the 16 patients with clinically primary hepatoma were positive. All of the 2 patients with suspected liver abscess were confirmed. And all of the 2 patients with suspected heaptic cyst were same as clinical diagnosis. 3) The cytodiagnosis of the pancreatic lesions were as follows: Of the two patients with suspected pancreatic cancer one was positive and the negative patient were confirmed pancreatic cancer by the exploratory laparotomy. One patient with clinically pancreatic cyst was revealed as pancreatic cyst by the cytodiagnosis. 4) There was no complication in performing ultrasonically guided percutaneous fine needle aspiration cytodiagnosis.
Microfluidic fabrication of fatty alcohol-based microparticles for NIR light-triggered drug release
Kim, Hyeon Ung,Roh, Yoon Ho,Shim, Min Suk,Bong, Ki Wan Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-
<P><B>Abstract</B></P> <P>The development of photo-triggered drug delivery system is promising for the temporal and spatial control of drug release. However, most of the progress in photothermal drug delivery has been focused on nanosized particles which can be removed from the injected sites by exocytosis. In this study, injectable and implantable near-infrared (NIR) light-responsive microparticles are fabricated using droplet-based microfluidics. The particles are composed of 1-tetradecanol, as a class of non-toxic phase change material, and IR780, as a NIR-absorbing photothermal agent. Doxorubicin, an anticancer drug, is encapsulated in the particles to obtain NIR light-responsive anticancer drug carriers. The photothermal response of IR780 to NIR irradiation facilitates the release of the encapsulated drug through the melting of 1-tetradecanol and demonstrates the NIR light-responsive drug release. This study shows that IR780-encapsulated 1-tetradecanol microparticles fabricated by droplet-based microfluidics have great potential as injectable and implantable drug carriers featuring NIR light-sensitive drug release.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Hyeon Ung,Choi, Dae Gun,Lee, Hyunjee,Shim, Min Suk,Bong, Ki Wan The Royal Society of Chemistry 2018 Lab on a chip Vol.18 No.5
<P>There has been increasing attention to the development of multi-stimuli-responsive drug carriers for precisely controlled drug release at target disease areas. In this study, pH- and redox-responsive hybrid drug carriers were fabricated by using both ketal-based acid-cleavable precursors and disulfide-based reducible precursors <I>via</I> stop-flow lithography. pH- and redox-sensitive drug release of the dual stimuli-responsive hybrid particles was confirmed, demonstrating their feasibility for selective and efficient drug release into tumor tissues in acidic and highly reductive environments. It was also found that the drug release rate of the particles was fine-tuned by modulating monomer compositions in the precursor. Importantly, the dual stimuli-responsive hybrid particles exhibited synergistic, controlled drug release in complex stimuli (both pH and redox stimuli) environments. To achieve tumor-selective combination chemotherapy, multicompartmental drug carriers consist of an acid-degradable compartment and a reducible compartment, which can separately encapsulate individual model drugs in each of the compartments. The multicompartmental particles exhibited independent drug release upon exposure to the corresponding stimulus. The dual stimuli-responsive, multicompartmental particles are effective drug carriers for tumor-selective release of a drug cocktail, leading to synergistic combination chemotherapy.</P>