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허강준 ( Gang Joon Heo ),강진휘 ( Jin Hui Kang ),신기욱 ( Gee Wook Shin ) 한국동물위생학회 2013 한국동물위생학회지 (KOJVS) Vol.36 No.4
The present study was to investigate anti-microbial effects of curcumin on major bacterial pathogens for farmed fish, such as Aeromonas hydrophila, A. salmonicida subsp. masoucida, A. salmonicida subsp. salmonicida, Edwardsiella tarda, Vibrio vulnificus, V. paraheamolyticus using disk diffusion, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) tests. In disc diffusion test, curcumin exhibited concentration-dependent antimicrobial activities to all bacteria pathogens used in the study. Antimicrobial effects of curcumin was found differently depending on bacterial species when determined by MIC or MBC tests. For examples, E. tarda and A. hydrophila was respectively the most sensitive bacterium for bacteriostatic and bacteriocidal effect of curcumin. Collectively, curcumin could be a potential natural drug for controlling pathogenic bacteria in the aquaculture industry.
Malachite Green의 구피(Poecilia reticulatus)에 대한 급성 및 아급성 독성
허강준(Gang-Joon Heo),김원규(Won-Gyu Kim),김윤배(Yun-Bae Kim),박세창(Se-Chang Park),박재학(Jae-Hak Park) 한국실험동물학회 2005 Laboratory Animal Research Vol.21 No.3
The acute and subacute toxicities of malachite green were evaluated in guppy (Poecilia reticulatus). Dipping of fishes for acute toxicity was performed for a period of 24 hrs, and TLm24h value (median tolerance limit=LC₅₀) was 0.23 ppm. Severe damages were observed in various organs and among them, clubbing of gill filaments, lytic degeneration and vacuolation of liver cells, and epithelial edema of renal tubules were relatively prominent. The most significant change was mild epithelial edema of gill lamellas in subacute toxicity test which fishes were exposed to 0.025 ppm of malachite green for 1week.
양식어류에 있어서 생약제제(바이오감마믹스)의 경구투여에 의한 효능 및 안전성에 관한 연구
허강준,김병기,예제길,김정호,Heo, Gang-joon,Kim, Byeung-gie,Yeh, Jae-gill,kim, Jeong-ho 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.3
A study on efficacy and safety of Bio-Gammamix was performed to use for the preventive drug against bacterial diseases to mirror carp(Cyprinus carpio), rainbow trout(Salmo gairdneri), eel(Anguilla japonica) and flounder(Paralichthys olivaceus). The main ingredients of Bio-Gammamix were ferrous fumarate and mixed extrated powders of licorice root, ox bile and garlic. The test drug was proved to improve feeding habit and feed efficiency and decrease cumulative mortality remarkably. After administration, no side effects and histopathological changes were observed. We can prevent outbreaks of bacterial diseases of fish by the dosage of 1kg/ton of fish body weight perorally once or two times in a day for 7 days and Bio-Gammamix is thought to be used effectively an widely against most bacterial fish pathogens.
잉어치어(稚魚)와 금붕어에 대한 folpet의 급성(急性) 및 아급성독성(亞急性毒性)에 관한 연구
허강준,이영순,임윤규,Heo, Gang-joon,Lee, Yong-soon,Lim, Yoon-kyu 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.2
The acute and subacute toxicity of fungicide folpet was evaluated in fingerings of common carp, Cyprinus carpio and goldfish, Carrassius auratus. Dipping of fishes for acute toxicity was performed for a period of 24h, and the TLm value(median tolerance limit) was 1.52 ppm in common carp and 1.45 ppm in goldfish. Severe damages were observed in various organs and among them, clubbing of gill lamella, lytic degeneration and vacuolation of liver cells, and epithelial edema of renal tubules were relatively prominent. The most significant changes were hyperbasophilic foci of liver cells in subacute toxicity test and these can imply the possibility of hepatocarcinogenecity of folpet.
양식어류(이스라엘 잉어, 넙치)에 대한 항균물질 pefloxacin의 효능 및 안전성에 관한 연구
허강준,김정호,Heo, Gang-joon,Kim, Jeong-ho 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.1
A study on quinolone antibacterial (pefloxacin methanesulfonate) was performed to use for the drug of fisheries. Petloxacin was proved excellent in antibacterial activity and resistance against fish pathogens when compared with the existing antibacterials. And any side effect was not observed during the period of indicated use. An outline of MIC(Minimal Inhibitory Concentration) was $1.6{\sim}6.4{\mu}g/ml$, $TLm_{48h}$ value were 380~420 ppm in Israeli carp(Cyprinus caprio) and 2100~2300 ppm in flounder(Paralichthys olivaceus). The residual time of fish body was less than 15 days. So we can treat some bacterial disease of fish by the dosage of 100 g/day/ton of fish body weight for 3 days and pefloxacin is thought to be used effectively and widely against most bacterial fish pathogens.
잉어치어(稚魚)에 대한 곰팡이독(fumonisin B<sub>1</sub>)의 급성(急性) 및 아급성독성(亞急性毒性)에 관한 연구
허강준,이진희,이영순,임윤규,Heo, Gang-joon,Lee, Jin-hee,Lee, Yong-soon,Lim, Yoon-kyu 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.4
The acute and subacute toxicity of fumomsin $B_1$ was evaluted in fingerlings of common carp, Cyprinus carpio. Dipping of fish for acute toxicity was performed for a period of 48 hours, and the $TLm_{48h}$ value(median tolerance limit) was more than 1000 ppm in common carp. Severe damages were observed in various organs and among them, clubbing of gill lamella, lytic degeneration and vacuolation of liver cells, and epithelial edema of renal tubules were relatively prominent. The most significant changes were hyperbasophilic foci of liver cells in subacute toxicity test and these can imply the possibility of hepatocarcinogenecity of fumonisin $B_1$.
허강준,Heo, Gang-joon The Korean Society of Veterinary Science 1992 大韓獸醫學會誌 Vol.32 No.3
건강한 무지개송어의 치어와 실험적으로 세균성 아가미병을 감염시킨 무지개송어의 치어에 있어서 아가미 조직과 그 병원균인 Flavobacterium branchiophila에 대하여 주사형 전자현미경(SEM)과 투과형 전자현미경(TEM)으로 관찰하였다. F branchiophila는 길이 $5{\sim}8{\mu}m$, 폭 약$0.5{\mu}m$의, 2~3균체가 서로 연결된 길고 가는 장간균으로서 균체의 주위에는 다수의 선모(pili)를 갖고있었다. 세균성 아가미병의 초기병소는 초미세 형태학적으로 이차새변의 비후에 의해 시작되며 병원균은 아가미 표면과 일정한 거리를 유지하며 부착되어 있었다. 주사형 전자현미경의 관찰에서 건강한 물고기의 아가미 표면은 미로와 같은 모양과 미세 섬모상의 돌기로 특정지어 질 수 있는 상피세포가 보이나 실험적으로 감염된 아가미 표면에서는 새변의 선단에서 부터의 증생 융합과 함께 표면의 미세구조가 붕괴되어 잘 관찰되지 않았다. F branchiophila는 표면에 실뭉치와 같이 엉클어져 부착되어 있었으며 5% 식염처리후에는 그 형태가 일정치 않았다. Gill epithelia of normal rainbow trout fingerlings and abnormal ones suffering bacterial gill disease by experimental infection were examined by transmitting electron microscopy (TEM) and scanning electron microscopy (SEM). TEM observations revealed that Flavobacterium branchiophila consisted of slender rods measuring 0.5 by 5 to $8{\mu}m$, and they had which were long, thin, flexible filaments measuring approximately 4 nm by $1{\mu}m$, and packed together to organize into bundles. Morphological alterations of the diseased epithelia started at hypertrophy of the lamellar epithelium. F branchiophila attached to the gill surface of infected fish through pili with a regular distance, and did not invade into gill tissue. In SEM observations, normal surface ultrastructure of epithelial cell in the outermost layer were characterized by a typical labyrinth-like structure branching and anastomosing microridges on the cell surface. Hyperplastic lesions in experimentally infected gill were most serious at near the tips. Each filament exhibited a club-like, and fusion between the filaments was sometimes observed at their tips. On the surface of gill filaments, thread-like bacterial cells attached and were entangled. The bacterial cells almost covered the surface. After immersion in 5 % NaCl, the cell of F branchiophila, however, appeared to be indeterminate shape.
Propolis의 어류 병원성 세균에 대한 in vitro 항균 효과
허강준 ( Gang Joon Heo ),원태경 ( Tae Gyeong Won ),신기욱 ( Gee Wook Shin ) 한국동물위생학회 2015 한국동물위생학회지 (KOJVS) Vol.38 No.2
The present study was to investigate in vitro antimicrobial effects of propolis against six different fish bacterial pathogens, Aeromonas hydrophila, Edwardsiella tarda, Vibrio vulnificus, V. parahaemolyticus, A. salmonicida subsp. masoucida, A. salmonicida subsp. salmonicida) using minimum inhibitory concentration (MIC) and minimum bacteriocidal concentration (MBC) tests. In the results, propolis exhibited antimicrobial activity against all bacteria used in the present study, but there was no marked difference in bacterial species except Vibrio species. Collectively, propolis was thought to be an usefulness antimicrobial substance for controlling bacterial diseases in the fish industry.