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Kim, Seung Min,Kim, You Jeong,Lee, Da Won,Jun, Lyu Jin,Jeong, Joon Bum,Park, Hyun Kyung,Jeong, You Young,Lee, Sung Ho,Kwon, Mun-Gyeong,Lee, Soon Jeong The Korean Society of Fisheries and Aquatic Scienc 2020 Fisheries and Aquatic Sciences Vol.23 No.9
Background: The study evaluated the effects of a butaphosphan and cyanocobalamin mixture on the immune system and stress in olive flounders, Paralichthys olivaceus. Methods: The mixture was intramuscularly injected into olive flounders at the current recommended dose. Furthermore, to determine the toxicity of overdose, a histological examination was performed after injection of 1-, 2-, and 4-fold higher than the recommended dose. Results: Immunity parameters were altered during the first 2 weeks after a single intramuscular injection of the mixture in olive flounders (average weight 20.5 ± 1.1 g). The levels of all tested items, except glutathione and antiprotease, were higher in the treated group than in the control group in the first week; the levels of all tested items were even higher in the second week in the treated group than in the control group. The level of nitro-blue tetrazolium, myeloperoxidase, and superoxide dismutase between the two groups differed significantly. Changes in the stress response to different seawater temperatures (increase or decrease in seawater temperature by 3-5 ℃ using 50 L heated or cooled seawater tanks) were studied by determining the changes in cortisol and glucose levels on days 1 and 7. Both cortisol and glucose levels were significantly lower in the treated group than in the control group. Histological analysis did not reveal any abnormalities after intramuscular injection of the mixture at doses that were 1-, 2-, and 4-fold higher than the recommended dose. Conclusions: Intramuscular injection of a butaphosphan and cyanocobalamin mixture is safe and effective in reducing stress and improving immunity in olive flounders.
Da-Jeong Kim,Seung-Chai Kim,Hwan-Ju Kim,Gyeong-Seo Park,Sang Chul Kang,Won-Il Kim 한국동물위생학회 2023 한국동물위생학회지 (KOJVS) Vol.46 No.3
Porcine epidemic diarrhea is an infectious intestinal disease caused by the porcine epidemic diarrhea virus (PEDV). Especially, when suckling piglets are infected, the mortality rate is close to 100%. PEDV is classified into G1 and G2 types based on genetic differences. The G2 type PEDV outbreak in the United States in 2013 was highly pathogenic and contagious, and it has spread worldwide and caused continuous economic losses. Most commercial vaccines used are G1 type vaccines, and existing vaccines do not fully protect piglets due to genetic differences. In this study, we evaluated the safety of the newly developed G2 type attenuated HSGP vaccine strain by inoculating it into piglets and testing whether the vaccine virus spreads to the non-vaccinated, negative pigs and whether the vaccine reverts to its virulence during serial passage experiments. Each experiment lasted for 7 days for each passage, and fecal viral titers, clinical symptoms, and weight gain were measured daily. After the experiment, necropsy was performed to measure intestinal virus titer and pathological evaluation. As a result of the first passage, no transmission of the vaccine virus to negative pigs co-housed with vaccinated pigs was observed. In addition, after four consecutive passage experiments, the clinical symptoms and small intestine lesions were gradually alleviated, and no virus was detected in the feces in the fourth passage experiment. Therefore, it was concluded that the vaccine was safe without virulence reversion in accordance with the guidelines of the current licensing authority. However, further studies are needed on the genetic changes and biological characteristics of the mutant virus that occur during successive passages of the attenuated vaccine since the replication and clinical symptoms of the virus increased until the third passage during successive passages of the vaccine virus. Based on this study, it was concluded that virulence reversion and safety evaluation of attenuated vaccines through serial passage in target animals can be useful to evaluate the safety of attenuated viruses.
Ryu, Da-Jeong,Oh, Rye-Gyeong,Seo, Yong-Deuk,Oh, Seok-Young,Ryu, Kwang-Sun Ecomed 2015 Environmental Science and Pollution Research Vol.22 No.14
<P>Renewable biomass has attracted great attention for the production of biooil, biogas, and biochar, a carbon residual applicable for carbon sequestration and environmental remediation. Rice straw is one of the most common biomasses among agricultural wastes in South Korea. As part of our advanced and environmentally friendly research, we applied biochar derived from rice straw as the anode material for lithium-ion batteries (LIBs). Porous carbons with a high surface area were prepared from rice straw. Such porous carbons have exhibited particularly large reversible capacity and hence proven to be a candidate anode material for high-rate and high-capacity LIBs. Rice straw-derived biochars were synthesized at four different temperatures: 400, 550, 700, and 900 C. The surface was modified by using HCl and H2O2 on the 550 C biochar in order to increase the surface area. The resulting biochar was characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). The surface area was measured by Brunauer-Emmett-Teller (BET) method. The electrochemical characterizations were investigated by galvanostatic charge-discharge (CD) curves, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). All samples exhibited reversible capacities of below 200 mAh g(-1). The surface-modified biochars exhibited improved cycle performance. Surface modification using HCl showed better cycle performance than H2O2. However, the capacities of the treated 550 C biochar were similar to those of non-surface-modified biochar.</P>
Lim, Da-Rae,Kim, Hye-Ryung,Park, Min-Ji,Chae, Ha-Gyeong,Ku, Bok-Kyung,Nah, Jin-Ju,Ryoo, So-Yoon,Wee, Sung-Hwan,Park, Yu-Ri,Jeon, Hyo-Sung,Kim, Ji-Jeong,Jeon, Bo-Young,Lee, Hyeong-Woo,Yeo, Sang-Geon,Pa ELSEVIER SCIENCE DIVISION 2018 JOURNAL OF VIROLOGICAL METHODS Vol.260 No.-
<P><B>Abstract</B></P> <P>A sensitive and specific swarm primer-based reverse transcription loop-mediated isothermal amplification (sRT-LAMP) assay for the detection of serotype O foot-and-mouth disease virus (FMDV) was developed and evaluated. The assay specifically amplified the <I>VP3</I> gene of serotype O FMDV, but did not amplify the <I>VP3</I> gene of other serotype FMDVs or any other viruses. The limit of detection of the assay was 10<SUP>2</SUP> TCID<SUB>50</SUB>/mL or 10<SUP>3</SUP> RNA copies/μL, which is 100 times lower than that of the RT-LAMP assay without swarm primers. The new assay is 10 times more sensitive than reverse transcription-polymerase chain reaction (RT-PCR) and is comparable to the sensitivity of real time RT-PCR (qRT-PCR). Evaluation of the assay using different serotypes of FMDV strains showed 100% agreement with the RT-PCR results. The previously reported serotype O FMDV-specific RT-LAMP assay did not detect 20 out of 22 strains of serotype O FMDVs, probably due to multiple mismatches between the primer and template sequences, showing that it is not suitable for detecting the serotype O FMDVs circulating in Pool 1 region countries, including Korea. In contrast, the developed sRT-LAMP assay with improved primers can rapidly and accurately diagnose serotype O FMDVs circulating in Pool 1 region countries and will be a useful alternative to RT-PCR and qRT-PCR.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A swarm primer-applied RT-LAMP assay was developed for the detection of serotype O FMDV. </LI> <LI> The assay was 10 times more sensitive than RT-PCR and comparable to the sensitivity of qRT-PCR. </LI> <LI> The swarm primer RT-LAMP assay showed 100% agreement with conventional RT-PCR. </LI> </UL> </P>