• Title, Summary, Keyword: bactericide

Search Result 19, Processing Time 0.032 seconds

Experimental Study for Validation of Treatment Efficiency of Microbiological Clogging in Underground Hydrocarbon Storage Caverns (지하유류비축기지 내 미생물학적 클로깅의 처리 효율성 확인을 위한 실험 연구)

  • Han, Hyeop-Jo;Lee, Jong-Un
    • Journal of the Korean Society of Mineral and Energy Resources Engineers
    • /
    • v.54 no.5
    • /
    • pp.459-466
    • /
    • 2017
  • Microbiological clogging is a factor that threatens proper operation of water curtain system in underground hydrocarbon storage caverns. Experimental studies were conducted to validate the effectiveness of bioclogging prevention and/or removal method currently used at each storage cavern. After artificial formation of bioclogging onto fracture surfaces of rock cores by injection of sea water or fresh water with nutrients, variations in the amount of discharge water and the number of planktonic bacteria were measured. Effect of bactericide on removal of pre-formed bioclogging was also studied. While the number of planktonic bacteria in sea water increased during clogging formation, it decreased in fresh water. The result indicated that enumeration of planktonic bactertia may not be a quantitative indicator of bioclogging. Bactericide treatment led to removal of planktonic bacteria in water. However, the amount of discharge water decreased again over time, which indicated that bactericide might not effectively remove pre-formed bioclogging.

A Study on Mineralogical and Microbiological Clogging in Water Curtain System of Underground Hydrocarbon Storage Caverns - Calcite and Slime-Forming Bacteria (지하 유류비축기지 수장막 시스템의 광물학적 및 미생물학적 클로깅 연구 - 방해석과 점액생성균)

  • Park, Hyung-Jun;Kim, Hyun-Cheol;Yang, Seung-Hee;Lee, Jong-Un
    • Journal of the Korean Society of Mineral and Energy Resources Engineers
    • /
    • v.54 no.1
    • /
    • pp.11-19
    • /
    • 2017
  • Mineralogical and microbiological clogging was investigated through experiments employing rock core columns for proper management of water curtain system in underground hydrocarbon storage caverns. Injection of the solution synthesized for calcite oversaturation resulted in precipitation of calcite on fracture surfaces and thus significant decrease in effluent volume through the columns over time. When the calcite clogging was treated with 0.1 N HCl, the effluent volume was recovered at 4 days. Microbiological clogging by slime-forming bacteria also led to fracture closure over time. Injection of 50 and 100 ppm of peroxyacetic acid as a bactericide to the bioclogging partly restored the effluent volume, however, the fracture was closed again over time. The result indicated that bactericide treatment might not be significantly effective for removal of sessile bacteria forming biofilms on fracture surfaces.

Efficient Photocatalytic Degradation of Salicylic Acid by Bactericidal ZnO

  • Karunakaran, Chockalingam;Naufal, Binu;Gomathisankar, Paramasivan
    • Journal of the Korean Chemical Society
    • /
    • v.56 no.1
    • /
    • pp.108-114
    • /
    • 2012
  • Salicylic acid degrades at different rates under UV-A light on $TiO_2$, ZnO, CuO, $Fe_2O_3$, $Fe_3O_4$ and $ZrO_2$ nanocrystals and all the oxides exhibit sustainable photocatalysis. While ZnO-photocatalysis displays Langmuir-Hinshelwood kinetics the others follow first order on [salicylic acid]. The degradation on all the oxides enhance with illumination intensity. Dissolved oxygen is essential for the photodegradation. ZnO is the most efficient photocatalyst to degrade salicylic acid. Besides serving as the effective photocatalyst to degrade salicylic acid it also acts as a bactericide and inactivates E.coli even in absence of direct light.

Synthesis of 2,6-dichloro-4-Nitro Aniline Mercuric Acetate and Its Pharmaceutical Effects (2,6 dichloro-4-Nitro Aniline Mercuric Acetate의 合成과 그 藥劑效果에 관한 硏究)

  • Cho, Chul-Hyung;Shin, Sung-Euy
    • Journal of the Korean Chemical Society
    • /
    • v.14 no.3
    • /
    • pp.207-212
    • /
    • 1970
  • A large variety of weed killers, insecticides, and bactericiedes on the market today are of almost infinite variety, but their pharmacological effects are different from each other according to the objects to cope with. Therefore, it is hoped that some chemical substance which serves as weed killer, an insecticide, and a bactericede at a same time, should be synthesized, in order to save expense and labor. I anticipated that the desire would be met by introducing to a molecule the radical which has the three effects. Here, I made an attempt of introducing $Cl_2$ gas to aniline considering the following respects: 1. Introduction velocity of $Cl_2$ gas under the varied temeratures and velocities of $Cl_2$ gas 2. The effect of reaction period under the condition which gives the most satisfactory yield. 3. The actions of catalysts, $SbCl_3$, $FeCl_3$, and $MoCl_5$, and their proportions when a mixture of the three catalysts is used in producing 2,6-dichloro-aniline. After consideration of above phenomena, the maximum production rate of 79.5% of 2.6-compound was obtained. With the compound I synthesized 2.6-dichloro-4-nitroaniline-mercuric acetate. Investigations of the effects of the compound as weed killer, an insecticide, and a bactericide showed that the compound, 2,6-dichloro-4-Nitro Aniline mercuric acetate has a satisfactory herbi-insecti-bactericidal effect.

  • PDF

Inhibitory Effects of Natural Antimicrobial Agenton Postharvest Decay in Fruits and Vegetables under Natural Low Temperature (천연 항균제처리를 병용한 과채류의 자연 저온저장기술 개발에 관한 연구)

  • 조성환;정진환;류충호
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.23 no.2
    • /
    • pp.315-321
    • /
    • 1994
  • In order to prevent the postharvest decay and to promote the freshness retention of fruits and vegetables grapefruit seed extract(GFSE), natural microorganism control agent, was applied to the preservation of fresh fruits and vegetables. Freshfruits and vegetables treated with GFSE and stored in polyethylene film (0.1mm) at 1$0^{\circ}C$-15$^{\circ}C$ of natural low temperature low kept better qualities in color and texture than the GFSE -not- treated control. The treatment using GFSE ina 250ppm to 500ppm concentration seemed to be an effective one for the control of Botrytis cinerea isolated in red wine grapes. After 4 weeks of storage the firmness rate of cucumbers treated with the dilute GFSE was four times higher than that of non-treated ones. GFSE showed effective inhibitory action towards plant pathological bacteria and fungi which were involved in the decay of fruits and vegetables. Minimum inhibitory concentrations of GFSE towards them were in the range of 250ppm to 500ppm .Direct visualization of microbial cells and spores using electron microscopy showed microbial cells and fungal spores the function of which was destroyed by treating with the dilute solutions of GFSE. It was observed that GFSE would reduced disease damages and have bactericide & fungicide properties during the storage of such fruits and vegetables as egg plant, wild edible greens , kumquat, and kiwi fruit.

  • PDF

Control of Bacterial Wilt of Tomato using Copper Hydroxide (코퍼 하이드록사이드를 이용한 토마토 풋마름병 방제)

  • Han, You-Kyoung;Han, Kyung-Sook;Lee, Seong-Chan;Kim, Su
    • The Korean Journal of Pesticide Science
    • /
    • v.15 no.3
    • /
    • pp.298-302
    • /
    • 2011
  • Bacterial wilt, caused by Ralstonia, solanacearum, is a very destructive disease to tomato plants (Solanum lycopersicum) in Korea. This study was undertaken to find out the growth inhibitory effect bactericides on bacterial wilt pathogen of streptomycin, oxytetracyclin streptomycin sulfate WP and significantly suppressed the growth of bacterial wilt pathogen. Copper hydroxide WP showed control value of 62.5%. Therefore, it is concluded that the bactericide used in this study showed strong inhibitory effect to tomato bacterial wilt and they can be recommend to control the disease. And also, Copper hydroxide WP may be effective for control of bacterial wilt of tomato in conventional culture, farming without agricultural and organic farming.

Application of a Microbial Toxicity Assay for Monitoring Treatment Efficiency of Pentachlorophenol in Water using UV Photolysis and $TiO_2$ Photocatalysis

  • Kim, Jung-Kon;Cho, Il-Hyung;Zoh, Kyung-Duk;Choi, Kyung-Ho
    • Proceedings of the Korean Environmental Health Society Conference
    • /
    • /
    • pp.146-150
    • /
    • 2004
  • Degradation efficiency of pentachlorophenol (PCP) by using direct UV photolysis and $TiO_2$ photocatalysis was evaluated with both chemical analyses and acute toxicity assessment employing luminescent bacteria Vibrio fischeri. PCP was chosen as a target compound in this study because of its wide application as fungicide, bactericide, insecticide and wood preservative in agriculture and many industries, in addition to its well-known environmental consequences. The acute toxicity to the microbe was reduced by >60% when applying UV alone, and was completely removed when treated with $UV-TiO_2$ combinations. Toxicity reduction pattern determined with the Microtox Assay generally corresponds with the chemistry data: However, it should be noted that toxicity was greater than expected by the chemistry data. Formation of TCBQ, a toxic byprodut, could not explain observed microbial toxicity. These observations are probably due to the presence of unidentified toxic PCP byproducts, which may include polychlorinated dibenzodioxins and polychlorinated dibenzofurans. When Microtox results were compared between different exposure time, i.e.,5 min and 15 min, an interesting pattern was noted with $UVA-\;TiO_2$ treatment. While no microbial toxicity was observed with 5 min exposure, an EC50 value of 45.4% was estimated with 15 min exposure, which was not observed in $UVB-\;TiO_2$ exposure. This result may suggest the presence of unidentified toxic degradation products generated in the later stage of treatment. Based on this study, $TiO_2$ photocatalyst, together with UVB photolysis could improve the removal of both PCP and its toxic derivatives in more efficient way. The Microtox Assay is promising and economical method for monitoring efficiency of wastewater treatment processes.

  • PDF

Optimum Spray Program of Preventive Bactericides for the Control of Bacterial Blossom Blight of Kiwifruit (참다래 꽃썩음병 예방약제 최적 살포 체계)

  • Shin, Jong-Sup;Park, Jong-Kyu;Kim, Gyoung-Hee;Jung, Jae-Sung;Hur, Jae-Seoun;Koh, Young-Jin
    • Research in Plant Disease
    • /
    • v.10 no.4
    • /
    • pp.297-303
    • /
    • 2004
  • Bacterial blossom blight of kiwifruit (Actinidia deliciosa) has been mainly controlled by antibiotics. Among 15 candidate chemicals, streptomycin sulfate oxytetracycline WP, streptomycin copper hydroxide WP and oxolinic acid WP were selected as preventive bactericides against bacterial blossom blight of kiwfruit through in vitro and in vivo test. Spray of streptomycin sulfate oxytetracycline WP and streptomycin copper hydroxide WP at flowering period was most effective in controlling bacterial blossom blight of kiwifruit. Among the various combinations of spray times at different spray periods, optimum spray program of the preventive bactericides for the control of bacterial blossom blight of kiwifruit was turned out to be 3 times application with 10 day-interval from early May during the flowering season of kiwifruits.

BGRcast: A Disease Forecast Model to Support Decision-making for Chemical Sprays to Control Bacterial Grain Rot of Rice

  • Lee, Yong Hwan;Ko, Sug-Ju;Cha, Kwang-Hong;Park, Eun Woo
    • The Plant Pathology Journal
    • /
    • v.31 no.4
    • /
    • pp.350-362
    • /
    • 2015
  • A disease forecast model for bacterial grain rot (BGR) of rice, which is caused by Burkholderia glumae, was developed in this study. The model, which was named 'BGRcast', determined daily conduciveness of weather conditions to epidemic development of BGR and forecasted risk of BGR development. All data that were used to develop and validate the BGRcast model were collected from field observations on disease incidence at Naju, Korea during 1998-2004 and 2010. In this study, we have proposed the environmental conduciveness as a measure of conduciveness of weather conditions for population growth of B. glumae and panicle infection in the field. The BGRcast calculated daily environmental conduciveness, $C_i$, based on daily minimum temperature and daily average relative humidity. With regard to the developmental stages of rice plants, the epidemic development of BGR was divided into three phases, i.e., lag, inoculum build-up and infection phases. Daily average of $C_i$ was calculated for the inoculum build-up phase ($C_{inf}$) and the infection phase ($C_{inc}$). The $C_{inc}$ and $C_{inf}$ were considered environmental conduciveness for the periods of inoculum build-up in association with rice plants and panicle infection during the heading stage, respectively. The BGRcast model was able to forecast actual occurrence of BGR at the probability of 71.4% and its false alarm ratio was 47.6%. With the thresholds of $C_{inc}=0.3$ and $C_{inf}=0.5$, the model was able to provide advisories that could be used to make decisions on whether to spray bactericide at the preand post-heading stage.

Chemical control of potato Blackleg disease caused by Erwinia carotovora subsp. atroseptica in Korea (감자 흑각병원균 Erwinia carotovora subsp. atroseptica의 화학적 방제)

  • Yu, Yong-Man;Zhu, Yong-zhe;Bae, Hu-Nam;Kim, Song-Mum;Lim, Chun-Keum;Hur, Jang-Hyun
    • The Korean Journal of Pesticide Science
    • /
    • v.7 no.1
    • /
    • pp.12-17
    • /
    • 2003
  • Potato blackleg disease caused by Erwinia carotovora subsp. atroseptica (Eca) has been a serious problem in Korea. Bactericidal activities of twelve bactericides including antibiotics, copper compounds and oxolinic acid were examined in vitro. Streptomycin, streptomycin sulfate, and oxolinic acid effectively controlled the pathogen at 0.02 mM. However, the pathogen developed resistance to the applied bactericides after 72 hours of incubation. Activity of copper compounds such as copper hydroxide, copper oxide and copper sulfate was lower than that of antibiotics. However, the pathogen did not develop resistant to them. Combinations of streptomycin (0.016 mM, 9.3 ppm) + copper oxide (1.2 mM, 171.6 ppm)/copper hydroxide (1.5 mM, 146.3 ppm); streptomycin sulfate (0.005 mM, 7.0 ppm) + copper oxide (1.2 mM, 171.6ppm)/copper hydroxide (1.5 mM, 146.3 ppm) were found to be effective for the control of E. carotovora subsp. atroseptica.