Publications by authors named "Sangryong Lee"

Article Synopsis
  • Plastic pollution is a growing concern, as evidenced by the discovery of microplastics (MP) in freshwater fishes in the Han River tributary, with 38 fish analyzed showing significant contamination levels.
  • The prevalent sizes of microplastics found in these fish ranged from 45 to 100 μm, primarily in the form of fragments, with polypropylene being the most common type.
  • The study highlights that the concentration of microplastics in smaller fish depends on their habitat and size, emphasizing the need for continued monitoring of microplastics in freshwater ecosystems.
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Up to 1.6 million tons of waste is produced annually by each of more than 21,000 concentrated animal feeding operations (CAFOs) located in the United States (USA). These operations give rise to externalities, including adverse local and global health impacts from CAFO waste emissions, which can potentially outweigh their economic viability.

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The prevalence of microplastic (MP) contamination has become a significant environmental concern due to its pervasive nature and persistent effects. While sediments are considered major repositories for MPs, information on their spatial distribution within these matrices is insufficient. This research examined both the horizontal and vertical presence of MPs in the sediments surrounding Lake Paldang in South Korea, alongside a comprehensive evaluation of the physicochemical characteristics of the samples obtained.

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An efficient interfacial heating system composed of a light-absorbing material and a hydrophilic porous support is developed through eco-friendly and energy-effective fabrication processes. Lignin nanoparticles (NPs) and cellulose nanofibers (CNFs) are harnessed as biorenewable light absorbers and hydrophilic supports, respectively. Lignin NPs are prepared using a solvent exchange process of the fractionated lignin with organic solvents to improve its π-π stacking and light-absorbing property for efficient photothermal conversion.

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Article Synopsis
  • The study uses Laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF-MS) to analyze the chemical structure and photochemical properties of two types of graphene oxide (GO) derivatives: synthesized by modified Brodie's method (BGO) and Hummers' method (HGO).
  • Results show that BGO has superior photochemical stability and energy absorption compared to HGO, making it more effective during analysis of small molecules and synthetic polymers.
  • The findings highlight LDI-TOF-MS as a valuable tool for characterizing various carbon materials, showcasing its analytical potential in examining the differences in photochemical properties between GO derivatives.
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Exogenous glycine betaine (GB) application has been reported to improve plant tolerance to various abiotic stresses, but its effect on freezing tolerance has not been well studied. We investigated the effect of exogenous GB on freezing tolerance of cabbage ( L.) leaves.

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Toxicological studies of O-ethyl-O-(4-nitrophenyl) phenylphosphonothioate (EPN) to aquatic vertebrates have been reported, but no reports on toxic mechanism was reported. As zebrafish (Danio rerio) embryos were exposed to EPN, no changes in their survival and hatching rates were observed until 96 h post fertilization (hpf), even at the highest treated concentration of 500 μg/L. In both 250 μg/L and 500 μg/L, edemas were observed in the heart and yolk sac, and a blood pool was also found.

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Tumor necrosis factor alpha (TNF-α) was initially recognized as a factor that causes the necrosis of tumors, but it has been recently identified to have additional important functions as a pathological component of autoimmune diseases. TNF-α binds to two different receptors, which initiate signal transduction pathways. These pathways lead to various cellular responses, including cell survival, differentiation, and proliferation.

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The behavior of cinnamycin on a biomimetic membrane was studied with respect to the curvature of a phosphatidylethanolamine (PE)-included membrane with the adhesion measured using an atomic force microscope (AFM). The membrane was formed through vesicle fusion on the hydrophobic surface of silica spheres, which was used to define the curvature of the membrane. The hydrophobicity was generated by the reaction of alkyl-silane and analyzed with an X-ray photoelectron spectrometer.

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In this study, fluorene (FL), FL-1-carboxylic acid (FC-1), and FL-9-carboxylic acid (FC-9) were investigated to understand their acute toxicity by measuring inhibitory effects on hatching rates and developmental processes of zebrafish embryos (Danio rerio). For exposure concentrations up to 3000 μg/L, FC-1 alone showed acute toxicity at 1458 μg/L for LC value. FC-1 caused yolk sac and spinal deformities, and pericardial edema.

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The binding of the cinnamycin on the biomimetic membrane was studied with respect to time using the surface plasmon resonance(SPR). The membrane was composed of the inner layer tethered on the gold surface and the outer layer formed on the inner layer, which was at the desired ratio of dioleoylphosphatidylethanolamine(DOPE) to dioleoylphosphatidyl- choline(DOPC). On the bilayer, the cinnamycin solution was injected and showed different behavior of the binding with respect to time up on its concentration.

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The effect of the trehalose on the physical properties of the fluidic lipid bilayer was studied using surface plasmon resonance (SPR) and cyclic voltammetry (CV). The bilayer was fabricated by tethering 1,2-dipalmitoyl-sn-glycero-3-phosphothioethanol on a gold surface to form a monolayer and then using liposomes to adsorb an upper layer on the tethered monolayer. The liposomes were prepared with a desired ratio (mol/mol) of trehalose to lipid, before the adsorption was performed.

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To develop the environmentally benign thermo-chemical process, this study placed great emphasis on the influence of CO on pyrolysis of cattle excreta for energy recovery. To this end, this study evaluates the possible enhanced energy recovery from cattle excreta using CO as reaction medium/feedstock in the thermal degradation of cattle excreta. The enhanced generation of CO in the presence of CO reached up to 15.

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This study laid an emphasis on the possible employment of biochar generated from pyrolysis of chicken manure to establish a green platform for producing biodiesel. To this end, the pseudo-catalytic transesterification reaction using chicken manure biochar and waste cooking oil was investigated. Compared with a commercial porous material (SiO), chicken manure biochar generated from 350°C showed better performance, resulting in 95.

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This report proposes a new approach to evaluate the odour nuisance of cattle manure samples from three different cattle breeds (i.e., native cattle, beef cattle, and milk cow) by means of quantification and speciation of volatile fatty acids (VFAs).

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This study lays great emphasis on establishing a reliable analytical platform to quantify and specify volatile fatty acids (VFAs) in the aqueous phase by derivatizing VFAs into their corresponding alkyl esters via thermally-induced rapid esterification (only 10 s reaction time). To this end, reaction conditions for the thermally-induced rapid esterification are optimized. A volumetric ratio of 0.

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This study focuses on investigating the optimized chemical composition of biochar used as porous material for biodiesel synthesis via pseudo-catalytic transesterification. To this end, six biochars from different sources were prepared and biodiesel yield obtained from pseudo-catalytic transesterification of waste cooking oil using six biochars were measured. Biodiesel yield and optimal reaction temperature for pseudo-catalytic transesterification were strongly dependent on the raw material of biochar.

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Ethnopharmacological Relevance: Gamisoyo-San (GSS) is a well-known Traditional Korean Medicine shown to be effective on mood disorders.

Aim Of The Study: The purpose of this research is to examine the effect of Gamisoyo-San on generalized anxiety disorder by its differently manufactured preparations.

Materials And Methods: Multicenter, randomized, double-blinded, placebo-controlled study was set for 147 patients with generalized anxiety disorder recruited from November 1st 2009 to December 16th 2010.

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We analyzed variations in chloroplast DNA (cpDNA) in the widespread herbaceous species Hosta sieboldiana and Hosta albomarginata across large portions of their geographic ranges in the Japanese archipelago. Our objective was to compare the phylogeographic histories and phylogeographic structures of the two congeneric species in the Japanese archipelago. The location of the study is Japanese archipelago.

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Ethnopharmacological Relevance: The root of Polygala tenuifolia Willd is a well-known traditional Oriental medicine and has been prescribed for treatment of dysfunction in memorial systems and various brain inflammatory diseases. The present study was designed to validate the anti-inflammatory effects of the water extract of Polygala tenuifolia root (WEPT).

Materials And Methods: The anti-inflammatory properties of WEPT were studied using lipopolysaccharide (LPS)-stimulated murine BV2 microglia model.

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