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젖소 유방원(乳房源) 병원세균(病原細菌)의 항생물질(抗生物質)에 대(對)한 감수성(感受性)
정종식,조성환,조용준,박청규,Chung, Jong Sig,Cho, Sung Whan,Cho, Yoong Jun,Park, Cheong Kyu 대한수의학회 1979 大韓獸醫學會誌 Vol.19 No.1
The sensitivities of 270 pathogens (124 Streptococci, 118 Staphylococci, 10 Corynebacterium pyogenes and 18 Escherichia coli) isolated from clinical or subclinical cases of bovine mastitis during lactation to 11 antibiotics were determined by the agar plate dilution method. All cultures of Streptococci were inhibited at $1.56{\mu}g/ml$ of ampicillin and 1.56 units/ml of penicillin G. Most of the cultures were inhibited at $3.125{\mu}g/ml$ of leukomycin, but were resistant to kanamycin, streptomycin, chloramphenicol, erythromycin and colistin at concentration of $12.5{\mu}g/ml$. More than 93% of the Staphlococcal cultures were sensitive to kanamycin, leukomycin, ampicillin, tetracycline, ledermycin and minocycline at concentrations of $12.5{\mu}g/ml$ or less, and sensitive to penicillin at concentration of 3.125 units/ml, but for more than 71% of the cultures to chloramphenicol, erythromycin and colistin the concentrations required to inhibit growth were 100 ${\mu}g/ml$ or higher. All 10 cultures of Corynebacterium pyogenes were inhibited by leucomycin, ampicillin and minocycline at concentration of $1.56{\mu}g/ml$ and by penicillin G at concentration of 0.78 units/ml, but all the cultures required at least $400{\mu}g/ml$ or higher of streptomycin, erythromycin and colistin for inhibition. More than 83% of E. coli cultures were sensitive to erythromycin and minocycline at concentration of $12.5{\mu}g/ml$, but resistant to leucomycin and chloramphenicol at concentration of $100{\mu}g/ml$.
The Physical and Catalytic Properties of Kuryongpo Natural Zeolite
정종식,서곤,전학제,김호기,Chong Sik Chung,Gon Seo,Hakze Chon,Hoagy Kim Korean Chemical Society 1977 대한화학회지 Vol.21 No.3
경북 구룡포산 천연제올라이트에 대한 물리적 성질과 촉매활성이 검토되었다. 정량분석과 X-선 회절스펙트럼으로부터 천연제올라이트는 30 ${\sim}$ $40{\%}$의 mordenite를 함유하고 있다. 원시료의 표면적은 $75m^2$/g에 불과하나 2N 염산으로 처리시 $320m^2$/g에 이른다. 톨루엔불균화 반응에 대해서도 2N에서 최대의 전화율을 보여주나, 활성저하가 심한 것으로 나타났으며 크실렌에 대한 벤젠의 선택성은 처리한 산농도가 증가함에 따라 감소하는 것으로 나타났다. The properties of the natural zeolite produced in Kuryongpo, Kyungsang-Bukdo, were investigated by X-ray diffraction analysis, chemical composition analysis, and nitrogen adsorption experiment. The quality of the acid treated natural zeolite as the catalyst for the disproportionation reaction of toluene was examined experimentally by observing the conversion in a microcatalytic reactor. The quantitative analysis and X-ray diffraction spectrum showed that the zeolite ore of Kuryongpo contained approximately 30 to 40 percent of mordenite structure. The surface area of the zeolite ore was $75m^2$/gm and increased to a maximum value of $320m^2$/gm after treatment with 2 N HCl solution. The catalytic activity for the toluene disproportionation reaction was maximum when the zeolite treated with 2 N HCl solution was used. The selectivity of xylene to benzene decreased with increasing degree of acid treatment.
경북지방(慶北地方) 젖소로 부터 Brucella abortus의 분리(分離) 및 균형별(菌型別)
정종식,조용준,박청규,Chung, Jong-sik,Cho, Yoong-jun,Park, Cheong-kyu 대한수의학회 1988 大韓獸醫學會誌 Vol.28 No.2
Serological study and isolation of Brucellae from dairy cattle were carried out in Kyungpook area of Korea during the period from 1984 to 1985. Biotyping of the isolates was done. Of the 11168 cattle in 2479 herds examined, 27 cattle (0.24%) in the 17 herds (0.69%) were serologically positive for brucellosis. Brucella abortus was recovered from 20 (74.1%) of the 27 infected cattle, and all the strains of the isolates belonged to biotype 1. Of the tissues cultured for brucellae, the supramammary lymph nodes had the highest rate (55.6%) of recovery of brucella organisms.
자동차용 PEMFC 전극 촉매의 열화 원인에 대한 연구
정종식(Chung, Jong-Shik),정철구(Chung, Chul-Goo),김림(Kim, Lim),성용욱(Sung, Yong-Wook) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
A long term deactivation study was carried out with commercial MEA provided by Hyundai Motor Co. The deactivation phenomena were observed only at high voltage region where there is no diffusion-limited reaction. A rapid deactivation was observed up to 40h owing to the sintering of Pt particles. This was followed a gradual increase in the activity up to 300 h, which is probably caused by improvement in the electrode properties in the presence of current during the reaction. After 300 h, monotonic decrease in the activity was observed owing to dissolution of Pt particles especially in the cathode. The presence oxygen is the cause of oxidation and dissolution of Pt. The dissolution rate can be somewhat retarded by generation of current, which reduces Pt ion back to Pt in the cathode.