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OALib Journal期刊

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Quantifying bacterial attachment and detachment using leaching solutions of various ionic strengths after bacterial pulse
Jae-Woo Choi,Kyu-Sang Kwon,Nag-Choul Choi,Sang-Gil Lee
- , 2017, DOI: 10.1186/s13568-017-0340-2
Abstract: In this study, we quantified the attachment and detachment of bacteria during transport in order to elucidate the contributions of reversible attachment on bacterial breakthrough curves. The first set of breakthrough experiment was performed for a laboratory sand column using leaching solutions of deionized water and mineral salt medium (MSM) of 200 mM with reference to KCl solution by employing Pseudomonas putida as a model bacterium. In the second set of experiment, the ionic strengths of leaching solutions immediately after bacterial pulse were lowered to tenfold and 100-fold diluted system (2 and 20 mM MSM) to focus on the influence of physicochemical factor. Results have shown that bacterial retention occurred in the sand column due to the physical deposition and physicochemical attachment. The physicochemical attachment was attributed to the high ionic strength (200 mM MSM) of leaching solution and the formation of primary energy minimum. Replacing the 200 mM leaching solution with the lower ionic strengths after pulse resulted in the increased tailing of breakthrough curve due to the detachment from the attached bacteria. The detachment could be well explained by DLVO theory, which showed the formation of energy barrier and disappearance of the secondary minimum as the ionic strength gradually decreased. Analysis of mass recovery revealed that 12–20% of the attachment was due to physical and physicochemical attachment, respectively, where the latter consisted of 25–75% of irreversible and reversible attachment respectively
Application of electron crystallography to structure characterization of ZnS nanocrystals
Jin-Gyu Kim,Sang-Gil Lee,Hyun-Min Park,Youn-Joong Kim
Journal of Analytical Science & Technology , 2011,
Abstract: We chracterized the structure properties of two types of ZnS nanocrystals by electron crystallography. X-ray diffraction analysis for these ZnS nanocrystals was performed to determine their initial structures. Their crystallite sizes were about 5.9 nm and 8.1 nm and their crystal systems were hexagonal and cubic, respectively. Their atomic structures, however, could not be determined because of the weak diffraction intensities as well as the unexpected intensities from impurty. To overcome these problems, the structures of ZnS nanocrystals were resolved by electron crystallography using EF-EPD (energy-filtered electron powder diffraction) and HRTEM (high resolution transmission electron microscopy) methods. The structrues determined by Rietveld analysis are P63mc (a = 3.8452 , c = 18.5453 ) and F-43m (a = 5.4356 ), respectively. Their crystallite shapes were nanorods and quasi-nanoparticles and the nanorod crystal were grown along the [001] direction. It was revealed that the phase transformation between the cubic sphalerite to the hexagonal wurtzite structure of ZnS nanocrytals was related to their shapes and growth mechanism. Electron cryststallogrpahy, employing EF-EPD and HRTEM methods together, has advantages for structure analysis and property chracterization of nano-sized materials.
Suppl-9, M7: The Role of Correction in the Conservative Treatment of Adolescent Idiopathic Scoliosis
Nico Tournavitis,Sang-Gil Lee,Shu-Yan Ng,Xiao-feng Nan
- , 2017, DOI: 10.2174/1874325001711011548
Abstract: Physiotherapeutic Scoliosis-Specific Exercises (PSSE) and bracing have been found to be effective in the stabilization of curves in patients with Adolescent Idiopathic Scoliosis (AIS). Yet, the difference among the many PSSEs and braces has not been studied. The present review attempts to investigate the role of curve correction in the outcome of treatment for PSSEs and braces
Work-related olfactory disorder: a case series and review
Huisu Eom,Hyun-Jin Cho,Jungho Ahn,Sang-Gil Lee,Soon Woo Park,Young Joong Kang
- , 2018, DOI: 10.1186/s40557-018-0230-3
Abstract: Detailed history and examination of 8 anosmia case
The Effects of Propionate and Valerate on Insulin Responsiveness for Glucose Uptake in 3T3-L1 Adipocytes and C2C12 Myotubes via G Protein-Coupled Receptor 41
Joo-Hui Han, In-Su Kim, Sang-Hyuk Jung, Sang-Gil Lee, Hwa-Young Son, Chang-Seon Myung
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095268
Abstract: Since insulin resistance can lead to hyperglycemia, improving glucose uptake into target tissues is critical for regulating blood glucose levels. Among the free fatty acid receptor (FFAR) family of G protein-coupled receptors, GPR41 is known to be the Gαi/o-coupled receptor for short-chain fatty acids (SCFAs) such as propionic acid (C3) and valeric acid (C5). This study aimed to investigate the role of GPR41 in modulating basal and insulin-stimulated glucose uptake in insulin-sensitive cells including adipocytes and skeletal muscle cells. Expression of GPR41 mRNA and protein was increased with maximal expression at differentiation day 8 for 3T3-L1 adipocytes and day 6 for C2C12 myotubes. GPR41 protein was also expressed in adipose tissues and skeletal muscle. After analyzing dose-response relationship, 300 μM propionic acid or 500 μM valeric acid for 30 min incubation was used for the measurement of glucose uptake. Both propionic acid and valeric acid increased insulin-stimulated glucose uptake in 3T3-L1 adipocyte, which did not occur in cells transfected with siRNA for GPR41 (siGPR41). In C2C12 myotubes, these SCFAs increased basal glucose uptake, but did not potentiate insulin-stimulated glucose uptake, and siGPR41 treatment reduced valerate-stimulated basal glucose uptake. Therefore, these findings indicate that GPR41 plays a role in insulin responsiveness enhanced by both propionic and valeric acids on glucose uptake in 3T3-L1 adipocytes and C2C12 myotubes, and in valerate-induced increase in basal glucose uptake in C2C12 myotubes.
The work-relatedness at a case of acute lymphoblastic leukemia in a radiation oncologist
Bong Hyun Kim,Bong Kyu Kim,Hyun Seok Lee,Sang-gil Lee,Young-Jun Kwon,Young-Su Ju,Yun Kyung Chung
- , 2017, DOI: 10.1186/s40557-017-0186-8
Abstract: a Location of the radioactive source, b Treatment tools used in brachytherapy of patients with cervical cancer. Cervix Cancer and Radiation, Available at https://youtu.be/20s1Gq4t7nY. Accessed 22 Feb 2016
Exploiting Anti-T-shaped Graphene Architecture to Form Low Tortuosity, Sieve-like Interfaces for High-Performance Anodes for Li-Based Cells
Dong Wang,Jin-Gyu Kim,Nicholas E. Drewett,Sang-Gil Lee,Seung Jo Yoo,Ting Deng,Wei Zhang,Xiaofei Liu,Xiaoyu Zhang,Xiaoyuan Shi
- , 2018, DOI: 10.1021/acscentsci.7b00444
Abstract:
Dermal and neural toxicity caused by acrylamide exposure in two Korean grouting workers: a case report
Heeyun Kim,Jeongbae Rhie,Sang Gil Lee
- , 2017, DOI: 10.1186/s40557-017-0207-7
Abstract: Patient 1 performs ceiling work and injects groutin
On the stability of an additive functional inequality
Sang-Cho Chung,Sang-Baek Lee,Won-Gil Park
International Journal of Mathematical Analysis , 2012,
Abstract:
Carbon Sequestration in Soil Cooperated with Organic Composts and Bio-Char during Corn (Zea mays) Cultivation  [PDF]
JoungDu Shin, Sun-Il Lee, Woo-Kyun Park, Yong-Su Choi, Seung-Gil Hong, Sang-Won Park
Journal of Agricultural Chemistry and Environment (JACEN) , 2014, DOI: 10.4236/jacen.2014.34018
Abstract: Background: The objective of this study was to estimate the carbon sequestration in soils cooperated with organic composts and bio-char during corn cultivation. Methods and Results: For the experiment, the soil texture used in this study was clay loam, and application rates of chemical fertilizer and bio-char were 230-107-190 kg·ha-1 (N-P2O5-K2O) as recommended amount after soil test and 0.2% to soil weight. The soil samples were periodically taken at every 15-day intervals during the experimental periods. The treatments consisted of cow compost, pig compost, swine digestate from aerobic digestion system, and their bio-char cooperation. For estimating soil C sequestration, it is determined by the net balance between carbon inputs and outputs during corn cultivation periods. For the experimental results, it found that applications of aerobic swine digestate, cow compost, and pig compost could sequester C by 38.9%, 82.2% and 19.7% in soil, respectively, when bio-char from rice hulls was cooperated with soil. For plant responses, application of bio-char in the corn field for carbon sequestration was not occurred the damage of corn growth. Conclusion: When bio-char from rice hulls was cooperated with soil, applications of aerobic swine digestate, cow compost, and pig compost could sequester C by 38.9%, 82.2% and 19.7% in soil, respectively. Therefore, addition of bio-char with organic composts could have a potential soil C sequestration in agricultural practices.
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