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My Kieu Ha, Tung Xuan Trinh, Jang Sik Choi, Desy Maulina, Hyung Gi Byun, Tae Hyun Yoon
Development of nanotoxicity prediction models is becoming increasingly important in the risk assessment of engineered nanomaterials. However, it has significant obstacles caused by the wide heterogeneities of published literature in terms of data completeness and quality. Here, we performed a meta-analysis of 216 published articles on oxide nanoparticles using 14 attributes of physicochemical, toxicological and quantum-mechanical properties. Particularly, to improve completeness and quality of the extracted dataset, we adapted two preprocessing approaches: data gap-filling and physicochemical property based scoring...
February 16, 2018: Scientific Reports
Deok Hyun Moon, Inseong Hwang, Agamemnon Koutsospyros, Kyung Hoon Cheong, Yong Sik Ok, Won Hyun Ji, Jeong-Hun Park
Lead (Pb) and zinc (Zn) contaminated rice paddy soil was stabilized using natural (NSF) and calcined starfish (CSF). Contaminated soil was treated with NSF in the range of 0-10 wt% and CSF in the range of 0-5 wt% and cured for 28 days. Toxicity characteristic leaching procedure (TCLP) test was used to evaluate effectiveness of starfish treatment. Scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) analyses were conducted to investigate the mechanism responsible for effective immobilization of Pb and Zn...
February 3, 2018: Chemosphere
Jin-Sung Park, Kyu-Dong Shim, Young-Sik Song, Ye-Soo Park
BACKGROUND CONTEXT: The influence of rheumatoid arthritis (RA) on the lumbar spine has received relatively little attention compared with cervical spine, and few studies have been conducted for adjacent segment disease (ASD) after lumbar fusion in the patients with RA. PURPOSE: To determine the incidence of ASD requiring surgery (ASDrS) after short lumbar fusion and to evaluate risk factors of ASDrS, including RA. STUDY DESIGN: Retrospective cohort study PATIENT SAMPLE: This study included 479 patients who underwent lumbar spinal fusion of 3 or fewer levels, with the mean follow-up period of 51...
February 13, 2018: Spine Journal: Official Journal of the North American Spine Society
Tae Il Kim, Dong Hyun Lim, Kwang Soo Baek, Sun Sik Jang, Beom Young Park, Vijayakumar Mayakrishnan
The important platform polysaccharide N-acetylglucosamine (GlcNAc) has great potential to be used in the fields of food, cosmetics, agricultural, pharmaceutical, medicine and biotechnology. This GlcNAc is being produced by traditional methods of environment-unfriendly chemical digestion with strong acids. Therefore, researchers have been paying more attention to enzymatic hydrolysis process for the production of GlcNAc. Hence, in this study, we isolated novel chitinase (Escherichia fergusonii) and chitosanase (Chryseobacterium indologenes, Comamonas koreensis) producing strains from Korean native calves feces, and developed the potential of an eco-friendly microbial progression for GlcNAc production from swollen chitin and chitosan by enzymatic degradation...
February 13, 2018: International Journal of Biological Macromolecules
Hui-Su Kim, Bo-Young Lee, Jeonghoon Han, Chang-Bum Jeong, Dae-Sik Hwang, Min-Chul Lee, Hye-Min Kang, Duck-Hyun Kim, Hee-Jin Kim, Spiros Papakostas, Steven A J Declerck, Ik-Young Choi, Atsushi Hagiwara, Heum Gi Park, Jae-Seong Lee
Monogononta is the most speciose class of rotifers, with more than 2000 species. The monogonont genus Brachionus is widely distributed at a global scale, and a few of its species are commonly used as ecological and evolutionary models to address questions related to aquatic ecology, cryptic speciation, evolutionary ecology, the evolution of sex, and ecotoxicology. With the importance of Brachionus species in many areas of research, it is remarkable that the genome has not been characterized. This study aims to address this lacuna by presenting, for the first time, the whole genome assembly of the freshwater species Brachionus calyciflorus...
February 16, 2018: Molecular Ecology Resources
Hui-Su Kim, Bo-Young Lee, Jeonghoon Han, Chang-Bum Jeong, Dae-Sik Hwang, Min-Chul Lee, Hye-Min Kang, Duck-Hyun Kim, Daehwan Lee, Jaebum Kim, Ik-Young Choi, Jae-Seong Lee
Marine medaka (Oryzias melastigma) is considered to be a useful fish model for marine and estuarine ecotoxicology studies and has good potential for field-based population genomics because of its geographical distribution in Asian estuarine and coastal areas. In this study, we present the first whole genome draft of O. melastigma. The genome assembly consists of 8,602 scaffolds (N50=23.737 Mb) and a total genome length of 779.4 Mb. A total of 23,528 genes were predicted, and 12,670 gene families shared with three teleost species (Japanese medaka, mangrove killifish, and zebrafish) were identified...
February 16, 2018: Molecular Ecology Resources
Ji Hee Lim, Hyung Wook Kim, Min Young Kim, Tae Woo Kim, Eun Nim Kim, Yaeni Kim, Sungjin Chung, Young Soo Kim, Bum Soon Choi, Yong-Soo Kim, Yoon Sik Chang, Hye Won Kim, Cheol Whee Park
Apoptosis and autophagy are harmoniously regulated biological processes for maintaining tissue homeostasis. AMP-activated protein kinase (AMPK) functions as a metabolic sensor to coordinate cellular survival and function in various organs, including the kidney. We investigated the renoprotective effects of cinacalcet in high-glucose treated human glomerular endothelial cells (HGECs), murine podocytes and C57BLKS/J-db/db mice. In cultured HGECs and podocytes, cinacalcet decreased oxidative stress and apoptosis and increased autophagy that were attributed to the increment of intracellular Ca 2+ concentration and the phosphorylation of Ca 2+ /calmodulin-dependent protein kinase kinaseβ (CaMKKβ)-Liver kinase B1 (LKB1)-AMPK and their downstream signals including the phosphorylation of endothelial nitric oxide synthase (eNOS) and increases in superoxide dismutases and B cell leukemia/lymphoma 2/BCL-2-associated X protein expression...
February 15, 2018: Cell Death & Disease
Sang-Chai Kim, Young-Kwon Park, Ho-Geun Ahn, Heon Lee, Sung-Jin Lee, Jung-Sik Kim, Sang-Chul Jung
Zinc oxide/activated carbon nanocomposites were synthesized by impregnating zinc oxide nanoparticles onto activated carbon powder using liquid phase plasma (LPP) method. Zinc oxide nanoparticles on the surface of activated carbon were fabricated rapidly by the LPP method due to reducing the zinc ion in aqueous solution. The obtained zinc oxide/activated carbon nanocomposites were characterized by XPS, HRTEM, and EDS. The amount of zinc oxide nanoparticles impregnated increased with increasing initial precursor concentration...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Hyung-Sun Yoon, Ik-Hyun Lim, Seong-Gyu Seo, Jeongdong Choi, Won-Chun Park, Eun-Sik Kim
To evaluate the sterilize efficiency of nano-sized recycled aggregates (RAs), several types of RAs were examined for the purpose of environmental stamping out procedure. The poultry (e.g., chicken) was selected as a target livestock of epidemic disease, and the blast furnace slag (BFS), fly ash (FA), slaked lime (SL), nano-cerium (n-Ce) and shell (Sh) were used as the RAs materials. The fermented solution of effective microorganisms (EM) was added to decompose the target livestock. Various kinds of lab-scale reactor were operated to examine the effects of RAs volume; high and low volume of RAs (e...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Young-Chul Park, Chang-Been Lee, Seong-Sik Bang, Dong-Ki Choi, Woo-Sik Whang, Jae-Kwon Lee, Jung-Woo Han, Taek-Kyun Jung
WC based alloy coatings included different mass percent of Co and Cr have been synthesized on high carbon steel by using a facile high velocity oxy-fuel spray method. The mechanical nature of the coating films has been investigated by micro vickers hardness and fracture toughness. X-ray diffraction (XRD) and EDX analyses indicate that the three different samples (WC-10Co-4Cr, WC-17Co, and WC-12Co) consist of pure WC, W, Cr, and Co constituents as well as W2C and Co6W6C phases. The SEM and image analysis results show that WC-10Co-4Cr condition has higher porosity than those of WC-17Co, and WC-12Co coatings...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Min-Ho Hong, Jun Sik Son, Tae-Yub Kwon
The selective laser melting (SLM) process parameters, which directly determine the melting behavior of the metallic powders, greatly affect the nanostructure and surface roughness of the resulting 3D object. This study investigated the effect of various laser process parameters (laser power, scan rate, and scan line spacing) on the surface roughness of a nickel-chromium (Ni-Cr) alloy that was three-dimensionally (3D) constructed using SLM. Single-line formation tests were used to determine the optimal laser power of 200 W and scan rate of 98...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Hemraj Mahipati Yadav, Sang-Chul Jung, Jung-Sik Kim
Graphite-SiO2-TiO2 composites with optimum graphite and SiO2 loadings were prepared by a facile one-pot chemical route. The structural, morphological and physiochemical properties of the samples were investigated by analytical techniques. UV-Vis-DRS analysis confirmed light absorbance edge of composites was sharply red-shifted to the visible region with increasing graphite and SiO2 content. The prepared composites showed higher photocatalytic activity towards degradation of benzene gas under visible light. The contribution of graphite and SiO2 on the enchantment of visible light photocatalytic performance of the composites was discussed...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Seong-Sik Bang, Young-Chul Park, Ji-Woon Lee, Soong-Keun Hyun, Tae-Bum Kim, Jae-Kwon Lee, Jung-Woo Han, Taek-Kyun Jung
In this study influence of spray distance on the properties of WC-12Co coatings deposited by HVOF was investigated. WC-12Co coating was sprayed at spray distance of 300, 385 and 450 mm. From microstructure observation, it is confirmed that the porosity of coatings increases with increasing the spray distance. The X-ray diffraction patterns indicate that the coatings consist of pure WC, W, and Co as well as W2C and Co6W6C phases. The increase of the spray distance accelerated the decarburization of coatings...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Chang-Been Lee, Seong-Sik Bang, Young-Chul Park, Jee Hun Kim, Nam-Seok Kim, Seung-Ho Yang, Jae-Sung Park, Jong-Bae Kim, Dong-Ho Choi, Soonwan Chung, Changjae Kim, Taek-Kyun Jung, Soong-Keun Hyun
The surface activated bonding (SAB) method generally has the advantage of high bonding strength, low contact resistance, and high microstructural stability at room temperature. In this study, Ti-Al laminates were produced by surface activated bonding with aluminum and titanium foils. Heat treatment was conducted at the temperature range from 200 to 550 °C in vacuum. The bonding strength Ti-Al laminates was measured by a peel test, and the interfacial characteristics were investigated microstructural observation...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Kyong-Hwan Chung, Hangun Kim, Young-Kwon Park, Byung-Hoon Kim, Jung-Sik Kim, Sang-Chul Jung
The estrogenicity of octyl glucoside was studied with its preparation method using microporous zeolites. Its estrogenicity was estimated using E-assay method to confirm the possibility as non-endocrine disruptive surfactant. The octyl glucoside was synthesized from D-glucose with 1-octanol by direct glucosidation. The high conversion of D-glucose was obtained on H-FAU zeolite which has a mild acid strength. The conversion and yield were improved with increasing of acid site amount of the zeolite catalysts. The octyl glucopyranoside is more hydrophilic than nonylphenol and has a high wettability...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Sung-Woong Han, Tae-Hoon Lee, Min-Sik Kang, Hyung Jin Kim, Hoon-Kyu Shin
Amyloid β (Aβ) peptide is considered to be the critical causative factor in the pathogenesis of Alzheimer's disease (AD) because the hydrophilic molecules accumulated outside of the neural cells and results in the formation of highly toxicity amyloid plaque. In this study, we probed the interaction between Aβ and the antibody using atomic force microscopy (AFM). We compared two kinds of antibodies which are the antibody for Aβ 1-42 (antibody42) and the antibody for Aβ 1-16 (antibody16). To detect the interaction between Aβ and the antibodies, the single molecular force spectroscopy was carried out using Aβ modified glass substrate and the antibodies modified AFM probes...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Sung-Min Kwon, Bong Ki Min, Jun Sik Son, Tae-Yub Kwon
Self-assembled monolayers of thiols have been used to link a range of materials to planar gold surfaces or gold nanoparticles in nanoscience and nanotechnology. Novel mercapto silane systems are a promising alternative to dental noble metal alloys for enhanced resin bonding durability Goldbased alloys for full-cast restorations contain various base metal elements, which may bond to acidic functional monomers chemically, in addition to noble metal elements. This study examined how the additional incorporation of a phosphate monomer (di-2-hydroxyethyl methacryl hydrogenphosphate, DHP) into novel mercapto silane primer systems affected the resin bond strength to a type IV gold alloy pretreated with the primers...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Sang-Chai Kim, Young-Kwon Park, Ho-Geun Ahn, Heon Lee, Sangmin Jeong, Jung-Sik Kim, Sang-Chul Jung
The liquid phase plasma (LPP) synthetic process has been exploited to synthesize nickel oxide nanoparticles doped TiO2 photocatalyst (NOTP) that can respond to visible light. The physicochemical properties of NOTPs were studied by several analysis instruments. The nickel oxide nanoparticles precipitated uniformly on the TiO2 powder are mostly NiO. The band gap energy of the NOTP measured was 2.99 eV, which was smaller than that of bare TiO2, 3.12 eV. The NOTP synthesized in this work showed high photoactivity under visible blue light...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Keum-Joo Park, Seong-Gyu Seo, Eun-Sik Kim, M N Islam, Hyung-Woon Song, Hyung-Sun Yoon
In this study, the nano-sized fume biogas production from food waste was investigated using lab scale semi-continuous stirred tank reactor (SCSTR) at 35 °C with 30d HRT and 30L working volume. The mesophilic digestion test was performed with three different feed materials (food waste) and food to microorganism (F/M) ratios (0.13, 0.34, and 0.27) in the same experiment. The results showed that the F/M ratios significantly affected the biogas production rate. The highest production rate was obtained at F/M ratio of 0...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Sang Chai Kim, Bo Sung Kang, Beom-Sik Kim, Young-Min Kim, Jong-Ki Joen, Young-Kwon Park
A mesoporous material, Al-MCM-41, was applied to the catalytic pyrolysis of municipal plastic film waste (MPFW) to produce large amounts of valuable hydrocarbons. Compared to non-catalytic pyrolysis, the catalytic pyrolysis of MPFW over Al-MCM-41 revealed a lower decomposition temperature and activation energy upon thermogravimetric analysis. Heavy aliphatic hydrocarbons, which are the major products of non-catalytic pyrolysis, were cracked into small hydrocarbons and converted efficiently to aromatic hydrocarbons by catalytic pyrolysis over Al-MCM-41...
February 1, 2018: Journal of Nanoscience and Nanotechnology
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