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    Assessment of toxic heavy metals in urban lake sediments as related to urban stressor and bioavailability

    Baek, Yong-Wook, An, Youn-Joo
    Environmental Monitoring and Assessment, 2010, Vol.171(1), pp.529-537 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Assessment of toxic heavy metals in urban lake sediments as related to urban stressor and bioavailability
    Author: Baek, Yong-Wook; An, Youn-Joo
    Subject: Heavy metal ; Urban lake ; Sediment ; Bioassay ; Toxicity ; Chironomus riparius
    Description: A suite of heavy metals was monitored at sediments and overlying water in three urban lakes located in Seoul, Korea during spring season 2006. Metals measured were zinc, arsenic, chromium, copper, nickel, and cadmium. All metal concentrations in urban lake sediments were much higher than those in natural lake sediments. Elevated metal levels in urban lake sediments are associated with urban runoff, including street dust polluted by heavy metals. Metals in sediments from urban lakes were extracted with a weak electrolyte solution (0.1 M Ca(NO 3 ) 2 ) to predict the toxicity of metals. Among the six heavy metals studied, Cu was the most extractable, followed by Ni and Zn. Ca(NO 3 ) 2 -extractable metal recoveries has a good relationship with metal toxicity based on Chironomus riparius bioassay. This study showed that urban stressors such as vehicle emissions could increase the concentration of heavy metals in urban lake sediments. In addition, there is a positive relationship between sediment toxicity by using C. riparius bioassay and Ca(NO 3 ) 2 -extractability of heavy metals from sediments.
    Is part of: Environmental Monitoring and Assessment, 2010, Vol.171(1), pp.529-537
    Identifier: 0167-6369 (ISSN); 1573-2959 (E-ISSN); 10.1007/s10661-009-1297-7 (DOI)

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    Assay-dependent effect of silver nanoparticles to Escherichia coli and Bacillus subtilis

    Kim, Shin, Baek, Yong-Wook, An, Youn-Joo
    Applied Microbiology and Biotechnology, 2011, Vol.92(5), pp.1045-1052 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
    Available
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    Title: Assay-dependent effect of silver nanoparticles to Escherichia coli and Bacillus subtilis
    Author: Kim, Shin; Baek, Yong-Wook; An, Youn-Joo
    Subject: Silver nanoparticle ; Microbial assay ; Toxicity ; Escherichia coli ; Bacillus subtilis
    Description: We assess the microbial assay-dependent effect of AgNP on gram-negative Escherichia coli and gram-positive Bacillus subtilis . The experiment was conducted via three different assays: a growth inhibition assay, a colony forming unit assay, and a liquid-to-plate assay. AgNP were exposed either as liquid suspensions or in an agar state. Bacterial sensitivity to AgNP was found to be dependent on the microbial assay employed. E. coli was more sensitive than B. subtilis in the growth inhibition and CFU assays, but B. subtilis was more vulnerable than E. coli in the liquid-to-plate assay, ostensibly owing to the food stress mechanisms of B. subtilis in exposure medium. The dissolution of silver from AgNP could not explain the observed toxicity of AgNP. We detected clear evidence of AgNP uptake by cells. The results of this study showed that the microbial toxicity of AgNP and the effects of dissolved silver ions were influenced profoundly by the microbial test method employed.
    Is part of: Applied Microbiology and Biotechnology, 2011, Vol.92(5), pp.1045-1052
    Identifier: 0175-7598 (ISSN); 1432-0614 (E-ISSN); 10.1007/s00253-011-3611-x (DOI)

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    Effects of Induced High Carbon Dioxide and Desiccated Atmospheres on the Water Loss and Survival of Subterranean and Invading Drywood Termites

    Choi, Baek Yong, Yoshimura, Tsuyoshi
    Journal of economic entomology, April 2016, Vol.109(2), pp.753-61 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Effects of Induced High Carbon Dioxide and Desiccated Atmospheres on the Water Loss and Survival of Subterranean and Invading Drywood Termites
    Author: Choi, Baek Yong; Yoshimura, Tsuyoshi
    Subject: Carbon Dioxide -- Physiology ; Isoptera -- Physiology ; Water -- Physiology
    Description: Termites have evolved a variety of morphological, physiological, and behavioral adaptations that together increase the chances of survival in unfavorable environments. Morphological advantages (i.e., a relatively large body size, a large mass of reserves that are metabolized by reducing body water mass, a mass of cuticular lipids, and cuticular hydrocarbons) increase the cuticular resistance to water loss under desiccating conditions. However, termites are incapacitated when exposed to high levels of CO2 and can be eradicated at sufficiently high levels. Based on the results of this study, in an artificially induced high CO2 atmosphere, the loss of body water from drywood termites increased, which generally led to increased rates of mortality. Although the mechanism for the increased loss of body water under high CO2 conditions was not determined, for practical application, the time required for fumigation can be reduced because of the increase in the rate of body water loss from drywood...
    Is part of: Journal of economic entomology, April 2016, Vol.109(2), pp.753-61
    Identifier: 0022-0493 (ISSN); 26612892 Version (PMID)

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    Assessment of toxic heavy metals in urban lake sediments as related to urban stressor and bioavailability

    Baek, Yong-Wook, An, Youn-Joo
    Environmental monitoring and assessment, December 2010, Vol.171(1-4), pp.529-37 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
    Available
    More…
    Title: Assessment of toxic heavy metals in urban lake sediments as related to urban stressor and bioavailability
    Author: Baek, Yong-Wook; An, Youn-Joo
    Subject: Cities ; Fresh Water -- Chemistry ; Geologic Sediments -- Chemistry ; Metals, Heavy -- Analysis ; Water Pollutants, Chemical -- Analysis
    Description: A suite of heavy metals was monitored at sediments and overlying water in three urban lakes located in Seoul, Korea during spring season 2006. Metals measured were zinc, arsenic, chromium, copper, nickel, and cadmium. All metal concentrations in urban lake sediments were much higher than those in natural lake sediments. Elevated metal levels in urban lake sediments are associated with urban runoff, including street dust polluted by heavy metals. Metals in sediments from urban lakes were extracted with a weak electrolyte solution (0.1 M Ca(NO(3))(2)) to predict the toxicity of metals. Among the six heavy metals studied, Cu was the most extractable, followed by Ni and Zn. Ca(NO(3))(2)-extractable metal recoveries has a good relationship with metal toxicity based on Chironomus riparius bioassay. This study showed that urban stressors such as vehicle emissions could increase the concentration of heavy metals in urban lake sediments. In addition, there is a positive relationship between sediment...
    Is part of: Environmental monitoring and assessment, December 2010, Vol.171(1-4), pp.529-37
    Identifier: 1573-2959 (E-ISSN); 20054710 Version (PMID); 10.1007/s10661-009-1297-7 (DOI)

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    Assay-dependent effect of silver nanoparticles to Escherichia coli and Bacillus subtilis

    Kim, Shin Woong, Baek, Yong-Wook, An, Youn-Joo
    Applied microbiology and biotechnology, December 2011, Vol.92(5), pp.1045-52 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
    Available
    More…
    Title: Assay-dependent effect of silver nanoparticles to Escherichia coli and Bacillus subtilis
    Author: Kim, Shin Woong; Baek, Yong-Wook; An, Youn-Joo
    Subject: Bacillus Subtilis -- Drug Effects ; Bacteriological Techniques -- Methods ; Colony Count, Microbial -- Methods ; Escherichia Coli -- Drug Effects ; Metal Nanoparticles -- Toxicity ; Silver -- Toxicity
    Description: We assess the microbial assay-dependent effect of AgNP on gram-negative Escherichia coli and gram-positive Bacillus subtilis. The experiment was conducted via three different assays: a growth inhibition assay, a colony forming unit assay, and a liquid-to-plate assay. AgNP were exposed either as liquid suspensions or in an agar state. Bacterial sensitivity to AgNP was found to be dependent on the microbial assay employed. E. coli was more sensitive than B. subtilis in the growth inhibition and CFU assays, but B. subtilis was more vulnerable than E. coli in the liquid-to-plate assay, ostensibly owing to the food stress mechanisms of B. subtilis in exposure medium. The dissolution of silver from AgNP could not explain the observed toxicity of AgNP. We detected clear evidence of AgNP uptake by cells. The results of this study showed that the microbial toxicity of AgNP and the effects of dissolved silver ions were influenced profoundly by the microbial test method employed.
    Is part of: Applied microbiology and biotechnology, December 2011, Vol.92(5), pp.1045-52
    Identifier: 1432-0614 (E-ISSN); 21986863 Version (PMID); 10.1007/s00253-011-3611-x (DOI)

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    Electroabsorption Modulated Laser With High Immunity to Residual Facet Reflection

    Kwon, Oh Kee, Baek, Yong Soon, Chung, Yun C
    IEEE Journal of Quantum Electronics, September 2012, Vol.48(9), pp.1203-1213 [Peer Reviewed Journal]
    IEEE Conference Publications, IEEE Journals & Magazines , IEEE Xplore, IEEE Journals & Magazines
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    Title: Electroabsorption Modulated Laser With High Immunity to Residual Facet Reflection
    Author: Kwon, Oh Kee; Baek, Yong Soon; Chung, Yun C
    Subject: Laser Modes ; Absorption ; Refractive Index ; Chirp ; Reflection ; Waveguide Lasers ; Distributed Feedback (Dfb) Laser ; Electroabsorption Modulator (Eam) ; Electroabsorption-Modulated Laser (Eml) ; Large-Signal Modulation ; Residual Facet Reflection ; Time-Domain Transfer Matrix Model ; Engineering ; Physics
    Description: We report on the design for an electroabsorption-modulated laser (EML) that can provide a high immunity to the optical signal reflected from its output facet without any fabrication complexity and performance compromise. In particular, we theoretically investigate the effects of residual facet reflection on the static and dynamic performances of the high-speed EMLs. For this analysis, an accurate and consistent time-domain transfer-matrix-based laser model is developed. Based on this model, we perform the steady-state and large-signal analyses for the EML with finite facet reflectivities. The simulation result indicates that the EML with a high-gain compression factor is capable of reducing the power fluctuation and facet reflection-induced chirp under large-signal modualtion. Thus, it is desirable to design for increasing the damping of a distributed feedback (DFB) laser to realize the EML with a high immunity to this facet reflection. The simulation also shows that the effect of this facet reflection strongly depends on the phase condition between the optical signal reflected from the output facet and the light emitted from the DFB laser and, in particular, at that specific phase condition, a clear eye opening appears even at the relatively high-output facet reflectivity (i.e., R_{f}=1\%).
    Is part of: IEEE Journal of Quantum Electronics, September 2012, Vol.48(9), pp.1203-1213
    Identifier: 0018-9197 (ISSN); 1558-1713 (E-ISSN); 10.1109/JQE.2012.2206799 (DOI)

    • Several versions

    Case Study on Slope Stability Changes Caused by Earthquakes—Focusing on Gyeongju 5.8 ML EQ

    Park, Sangki, Kim, Wooseok, Lee, Jonghyun, Baek, Yong
    Sustainability, 2018, Vol.10(10), p.3441 [Peer Reviewed Journal]

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    Analgesic effect of electroacupuncture on inflammatory pain in collagen-induced arthritis rats: mediation by alpha2- and beta-adrenoceptors

    Park, Dong Suk, Seo, Byung Kwan, Baek, Yong Hyeon
    Rheumatology international, February 2013, Vol.33(2), pp.309-14 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Analgesic effect of electroacupuncture on inflammatory pain in collagen-induced arthritis rats: mediation by alpha2- and beta-adrenoceptors
    Author: Park, Dong Suk; Seo, Byung Kwan; Baek, Yong Hyeon
    Subject: Acupuncture Analgesia ; Electroacupuncture ; Arthritis, Experimental -- Therapy ; Receptors, Adrenergic, Alpha-2 -- Physiology ; Receptors, Adrenergic, Beta -- Physiology
    Description: This study was designed to investigate whether alpha- and beta-adrenergic systems mediate the analgesic effect of electroacupucture (EA) on inflammatory pain in a rat model of collagen-induced arthritis (CIA). To induce CIA, male Sprague-Dawley rats were immunized with bovine type II collagen emulsified in Freund's incomplete adjuvant, followed by a booster injection 14 days later. After induction of arthritis, the inflammatory pain threshold by the tail flick latency decreased as time passed and reached the minimum value at 4th week. Four weeks after the first immunization, low-frequency EA stimulation (2 Hz, 0.07 mA, 0.3 ms) delivered to Zusanli (ST(36)) for 30 min showed the analgesic effect. And also, the analgesic effect of EA was blocked by pretreatment with yohimbine (alpha2-adrenoceptor antagonist, 2 mg/kg, i.p.), but not by pretreatment with prazosin (alpha1-adrenoceptor antagonist, 1 mg/kg, i.p.) and propranolol (non-selective beta-adrenoceptor antagonist, 10 mg/kg, i.p.). These...
    Is part of: Rheumatology international, February 2013, Vol.33(2), pp.309-14
    Identifier: 1437-160X (E-ISSN); 22441959 Version (PMID); 10.1007/s00296-012-2369-5 (DOI)

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    Analgesic effect of electroacupuncture on inflammatory pain in collagen-induced arthritis rats: mediation by alpha2- and beta-adrenoceptors

    Park, Dong, Seo, Byung, Baek, Yong
    Rheumatology International, 2013, Vol.33(2), pp.309-314 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
    Available
    More…
    Title: Analgesic effect of electroacupuncture on inflammatory pain in collagen-induced arthritis rats: mediation by alpha2- and beta-adrenoceptors
    Author: Park, Dong; Seo, Byung; Baek, Yong
    Subject: Electroacupuncture ; Collagen-induced arthritis ; Adrenoceptor ; Prazosin ; Yohimbine ; Propranolol
    Description: This study was designed to investigate whether alpha- and beta-adrenergic systems mediate the analgesic effect of electroacupucture (EA) on inflammatory pain in a rat model of collagen-induced arthritis (CIA). To induce CIA, male Sprague–Dawley rats were immunized with bovine type II collagen emulsified in Freund’s incomplete adjuvant, followed by a booster injection 14 days later. After induction of arthritis, the inflammatory pain threshold by the tail flick latency decreased as time passed and reached the minimum value at 4th week. Four weeks after the first immunization, low-frequency EA stimulation (2 Hz, 0.07 mA, 0.3 ms) delivered to Zusanli (ST 36 ) for 30 min showed the analgesic effect. And also, the analgesic effect of EA was blocked by pretreatment with yohimbine (alpha2-adrenoceptor antagonist, 2 mg/kg, i.p.), but not by pretreatment with prazosin (alpha1-adrenoceptor antagonist, 1 mg/kg, i.p.) and propranolol (non-selective beta-adrenoceptor antagonist, 10 mg/kg, i.p.). These results suggest that the low-frequency EA can relieve the inflammatory pain in CIA, and the analgesic effect of EA can be mediated by alpha2- and beta-adrenoceptor, but not by alpha1-adrenoceptor.
    Is part of: Rheumatology International, 2013, Vol.33(2), pp.309-314
    Identifier: 0172-8172 (ISSN); 1437-160X (E-ISSN); 10.1007/s00296-012-2369-5 (DOI)

    • Several versions

    The analgesic effect of electroacupuncture on inflammatory pain in the rat model of collagenase-induced arthritis: mediation by opioidergic receptors

    Seo, Byung, Park, Dong, Baek, Yong
    Rheumatology International, 2013, Vol.33(5), pp.1177-1183 [Peer Reviewed Journal]