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( Sabrina Hossain ),( Sudu Hakuruge Madusha Pramud Wimalasena ),( Mahanama De Zoysa ),( Gang-joon Heo ) 대한인수공통전염병학회 2016 창립총회 및 학술대회 초록집 Vol.2016 No.1
Introduction: Pet turtles are known as a source of bacterial infection to humans when handled in captivity. Pet turtle rearing has become increasingly popular worldwide. However, turtles carry many pathogenic enteric bacteria which have been classically associated with warm-blooded animals including humans. Citrobacter spp. can be responsible for Citrobacter infection in humans if the owner fails to handle a pet turtle with care. The bacteria can be transmitted by physical contact with the infected turtles or through contaminated environments such as water and soil in turtle cages. Methods: 34 turtles purchased from nine pet shops and eight online markets in Korea were examined to determine whether the turtles and their environment such as soil and water were contaminated with Citrobacter spp. Biochemical tests and morphology revealed that Citrobacter spp. were isolated from samples. Presumptive isolates were identified through 16S rRNA gene sequencing. Each of the isolate`s antibiotic resistance was characterized with a disk diffusion test. Results: Citrobacter spp. were isolated from 7 of 34 (20.6%) fecal samples. Five were identified as C. freundii and two as unknown Citrobacter spp. through 16S rRNA sequencing. The isolation rate of Citrobacter spp. from their environment increased over time. All seven Citrobacter spp. strains showed susceptibility against most of the commonly used veterinary antibiotics. Every Citrobacter strain was susceptible to amikacin, ceftriaxone, ciprofloxacin, imipenem, sulfamethoxazole/ trimethoprim and tetracycline but resistant to cefoxitin, cephalotin and chloramphenicol. All were resistant to amoxicillin and ampicillin except one isolate, which showed intermediate resistance. Conclusion: This study concluded that some pet turtles sold in Korea are carriers of Citrobacter spp. Awareness of pathogenic bacteria when handling pet animals like turtles to prevent their transmission is an important public health concern. Therefore, further studies should be performed to genetically characterize these isolates as well as other harmful human pathogenic bacteria isolated from the pet turtles.
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Ying Zhang,Chao Han,Eerdunchaolu,Sudu 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.8
The influence of the Rashba spin-orbit interaction (SOI) and longitudinal optical (LO) phonon effect on the ground-state properties of the Fr¨ohlich bipolaron in a quantum dot are studied using the Tokuda-modified linear-combination operator method based on the Lee-Low-Pines unitary transformation. The results indicate that, under the condition of strong electron-phonon coupling (coupling strength > 6), Eint < 0, the electron-phonon coupling body in quantum dot is mainly the bipolaron which is in a stably bound state. The bipolaron interaction energy Eint increases with increasing confinement strength of the quantum dot !0, electron-phonon coupling strength , and polaron velocity u and decreases with increasing Coulomb confinement potential and Rashba spinobit coupling strength R. In the bipolaron interaction energy Eint, the electron-phonon coupling energy Ee−ph plays the leading role, followed by the confinement potential energy of the quantum dot Ecoul and the Coulomb interaction energy between two electrons Ecouf . Though the additional energy ER−ph caused by the phonon effect accounts for a smaller percentage than the previous three, the electron-phonon coupling and the Rashba spin-obit coupling influence and infiltrate each other. Therefore, the influences of the bipolaron effect and the Rashba electron-spin interaction cannot be ignored when studying a quantum dot.
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