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 Agricultural Water Efficiency and Salinity Research Unit: Riverside, CA
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ARS Home Pacific West Area Riverside, California Agricultural Water Efficiency and Salinity Research Unit People & Locations







Abasiofiok Mark Ibekwe

(Mark)
                        Agricultural Water Efficiency and Salinity Research Unit

                        




                        
                        Research Microbiologist
                        Phone: (909) 845-2809
                        
                        
                        Fax: (Employee information on this page comes from the REE Directory. Please contact your front office staff to update the REE Directory.)
                            ProjectsProtection of Food and Water Supplies from Pathogens and Human Induced Chemicals of Emerging Concern
                                                    In-House Appropriated
                                                                    (D)Accession Number: 441165Biochar-Based Polishing Technology for Treated Municipal Wastewater to Mitigate Antimicrobial Resistance Dissemination in Irrigated Cropping Systems
                                                    Reimbursable Cooperative Agreement
                                                                    (R)Accession Number: 443704Dissemination and Risk of Anthropogenically Induced Antibiotic Resistance in the Agricultural Environment
                                                    Reimbursable Cooperative Agreement
                                                                    (R)Accession Number: 439536Multi-Soil-Layering Technology for Removal of Antibiotic, Antibiotic Resistant Bacteria, and Antibiotic Resistance Genes from Soil Columns
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 436838**Publications**
                                                (Clicking on the reprint icon
                                                    Reprint Icon
                                                    will take you to the publication reprint.)An analysis of culture-based methods used for the detection and isolation of Salmonella spp., Escherichia coli, and Enterococcus spp. from surface water: a systematic review
                                                        

- (Peer Reviewed Journal)Mcconn, B.R., Kraft, A.L., Durso, L.M., Ibekwe, A.M., Frye, J.G., Wells, J., Tobey, E.M., Ritchie, S.M., Williams, C.F., Cook, K.L., Sharma, M. 2024. An analysis of culture-based methods used for the detection and isolation of Salmonella spp., Escherichia coli, and Enterococcus spp. from surface water: a systematic review. Science of the Total Environment. https://doi.org/10.1016/j.scitotenv.2024.172190.Cephalexin interaction with sludge-derived dissolved organic matter: binding mechanism and implications for adsorptive removal
                                                        

- (Peer Reviewed Journal)Schmidt, M.P., Ashworth, D.J., Ibekwe, A.M. 2024. Cephalexin interaction with sludge-derived dissolved organic matter: binding mechanism and implications for adsorptive removal. Environmental Science: Water Research & Technology. 2024(10)949-959. https://doi.org/10.1039/D3EW00590A.A comparison of methods to detect low levels of Salmonella enterica in surface waters to support antimicrobial resistance surveillance efforts performed in multiple laboratories
                                                        

- (Peer Reviewed Journal)Kraft, A., Wells, J., Frye, J.G., Ibekwe, A.M., Durso, L.M., Hiott, L.M., East, C.L., Mcconn, B., Franklin, A.M., Boczek, L.A., Garland, J.L., Kabrera, C., Mcdermott, P., Ottesen, A.R., Zheng, J., Cook, K.L., Sharma, M. 2023. A comparison of methods to detect low levels of Salmonella enterica in surface waters to support antimicrobial resistance surveillance efforts performed in multiple laboratories  . Science of the Total Environment. https://doi.org/10.1016/j.scitotenv.2023.167189.Persistence of E. coli O157:H7 in Frozen Soils: Role of
Freezing Temperature
                                                        

- (Peer Reviewed Journal)Wang, J., Liao, J., Ma, J., Lyu, G., Yang, X., Ibekwe, A.M., Ma, J. 2023. Persistence of E. coli O157:H7 in Frozen Soils: Role of Freezing Temperature. Science of the Total Environment. 15(17):13249. https://doi.org/10.3390/su151713249.Evaluation of idexx quantitray for quantification and isolation of antibiotic resistant bacteria

- (Abstract Only)Durso, L.M., Wells, J., Ibekwe, A.M., Frye, J.G., Sharma, M., Berry, E.D. 2023. Evaluation of idexx quantitray for quantification and isolation of antibiotic resistant bacteria. ASA-CSSA-SSSA Annual Meeting Abstracts. Available: https://scisoc.confex.com/scisoc/2023am/meetingapp.cgi/Paper/149118.Potential reservoirs of antimicrobial resistance in livestock waste and treated wastewater that can be disseminated to agricultural land
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Bhattacharjee, A.S., Phan, D., Ashworth, D.J., Schmidt, M.P., Murinda, S.E., Obayiuwana, A., Murry, M.A., Schwartz, G., Lundquist, T., Ma, J., Karathia, H., Fanelli, B., Hasan, N.A., Yang, C. 2023. Potential reservoirs of antimicrobial resistance in livestock waste and treated wastewater that can be disseminated to agricultural land. Science of the Total Environment. 872. Article 162194. https://doi.org/10.1016/j.scitotenv.2023.162194.Optimizing date palm leaf and pistachio shell biochar properties for antibiotic adsorption by varying pyrolysis temperature
                                                        

- (Peer Reviewed Journal)Schmidt, M.P., Ashworth, D.J., Marquez Celis, N., Ibekwe, A.M. 2023. Optimizing date palm leaf and pistachio shell biochar properties for antibiotic adsorption by varying pyrolysis temperature. Bioresource Technology Reports. 21. Article 101325. https://doi.org/10.1016/j.biteb.2022.101325.Dissemination of antibiotics through the wastewater–soil–plant–earthworm continuum
                                                        

- (Peer Reviewed Journal)Ashworth, D.J., Ibekwe, A.M., Men, Y., Ferreira, J.F. 2022. Dissemination of antibiotics through the wastewater–soil–plant–earthworm continuum. Science of the Total Environment. 858. Article 159841. https://doi.org/10.1016/j.scitotenv.2022.159841.Editorial: Exposure, risks, and drivers of the mobile antimicrobial resistance genes in the environment – a global perspective
                                                        

- (Peer Reviewed Journal)Brooks, J.P., Durso, L.M., Ibekwe, A.M. 2021. Editorial: Exposure, risks, and drivers of the mobile antimicrobial resistance genes in the environment – a global perspective. Frontiers in Microbiology. 12:1-3. https://doi.org/10.3389/fmicb.2021.803282.Prevalence of antibiotic resistance genes in pharmaceutical wastewaters
                                                        

- (Peer Reviewed Journal)Obayiuwana, A., Ogunjobi, A., Ibekwe, A.M. 2021. Prevalence of antibiotic resistance genes in pharmaceutical wastewaters. Water. 13(13). Article 1731. https://doi.org/10.3390/w13131731.Influence of seasonal changes and salinity on spinach phyllosphere bacterial functional assemblage
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Ors, S., Ferreira, J.F., Liu, X., Suarez, D.L. 2021. Influence of seasonal changes and salinity on spinach phyllosphere bacterial functional assemblage. PLoS ONE. 16(6). Article e0252242. https://doi.org/10.1371/journal.pone.0252242.Diversity of Plasmids and Genes Encoding Resistance to
Extended-Spectrum ß-Lactamase in Escherichia coli from
Different Animal Sources
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Durso, L.M., Ducey, T.F., Oladeinde, A., Jackson, C.R., Frye, J.G., Dungan, R.S., Moorman, T.B., Brooks, J.P., Obayiuwana, A., Karathia, H., Fanelli, B., Hasan, N.A. 2021. Diversity of plasmids and genes encoding resistance to extended-spectrum ß-Lactamase in Escherichia coli from different animal sources. Microorganisms. 9(5). Article 1057. https://doi.org/10.3390/microorganisms9051057.Comparative use of quantitative PCR (qPCR), droplet digital PCR (ddPCR) and Recombinase Polymerase Amplification (RPA) in detection of Shiga Toxin-producing E. coli (STEC) in environmental samples
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E., Park, S., Obayiuwana, A., Murry, M.A., Shwartz, G., Lundquist, T. 2020. Comparative use of quantitative PCR (qPCR), droplet digital PCR (ddPCR) and Recombinase Polymerase Amplification (RPA) in detection of Shiga Toxin-producing E. coli (STEC) in environmental samples. Water. 12(2). Article 3507. https://doi.org/10.3390/w12123507.Persistence of Salmonella Typhimurium in apple-pear (Pyrus bretschneideri Rehd.) orchard soils influenced by bacterial communities and soil properties
                                                        

- (Peer Reviewed Journal)Liao, J., Li, J., Han, Z., Lyu, G., Ibekwe, A.M., Ma, J. 2021. Persistence of Salmonella Typhimurium in apple-pear (Pyrus bretschneideri Rehd.) orchard soils influenced by bacterial communities and soil properties. Science of the Total Environment. 768. Article 144458. https://doi.org/10.1016/j.scitotenv.2020.144458.Utilization of semi-continuous algae culture for the treatment of recycled dairy lagoon wash water
                                                        

- (Peer Reviewed Journal)Schwartz, G., Ibekwe, A.M., Lundquist, T., Murinda, S., Murry, M.A. 2021. Utilization of semi-continuous algae culture for the treatment of recycled dairy lagoon wash water. Current Biochemical Engineering. 7(1):72-82. https://doi.org/10.2174/2212711907666210622153521.Soil salinity, pH, and indigenous bacterial community interactively influence the survival of E. coli O157:H7 revealed by multivariate statistics
                                                        

- (Peer Reviewed Journal)Ziming, H., Ma, J., Yang, C., Ibekwe, A.M. 2020. Soil salinity, pH, and indigenous bacterial community interactively influence the survival of E. coli O157:H7 revealed by multivariate statistics. Environmental Science and Pollution Research. 28:5575-5586. https://doi.org/10.1007/s11356-020-10942-6.Antibiotic resistance genes occurrence in wastewaters from selected pharmaceutical facilities in Nigeria
                                                        

- (Peer Reviewed Journal)Obayiuwana, A., Ibekwe, A.M. 2020. Antibiotic resistance genes occurrence in wastewaters from selected pharmaceutical facilities in Nigeria. Water. 12(7). Article 1897. https://doi.org/10.3390/w12071897.System of multi-layered environmental media for the removal of antibiotics from wastewater
                                                        

- (Peer Reviewed Journal)Ashworth, D.J., Ibekwe, A.M. 2020. System of multi-layered environmental media for the removal of antibiotics from wastewater. Journal of Environmental Chemical Engineering. 8(5). https://doi.org/10.1016/j.jece.2020.104206.Functional relationships between aboveground and belowground spinach (Spinacia oleracea L., cv. Racoon) microbiomes impacted by salinity and drought
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Ors, S., Ferreira, J.F., Liu, X., Suarez, D.L., Ma, J., Ghasemimianaei, A., Yang, C. 2020. Functional relationships between aboveground and belowground spinach (Spinacia oleracea L., cv. Racoon) microbiomes impacted by salinity and drought. Science of the Total Environment. 717. https://doi.org/10.1016/j.scitotenv.2020.137207.Linking microbial community composition in treated wastewater with water quality in distribution systems and subsequent health effects
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E. 2019. Linking microbial community composition in treated wastewater with water quality in distribution systems and subsequent health effects. Microorganisms. 7(12). https://doi.org/10.3390/microorganisms7120660.Tricarboxylic Acid (TCA) Cycle Enzymes and Intermediates Modulate Intracellular Cyclic di-GMP Levels and the Production of Plant Cell Wall–Degrading Enzymes in Soft Rot Pathogen Dickeya dadantii
                                                        

- (Peer Reviewed Journal)Yuan, X., Zeng, Q., Xu, J., Severin, G.B., Zhou, X., Waters, C.M., Ibekwe, A.M., Liu, F., Yang, C. 2020. Systematic study of the TCA cycle in virulence regulation links cyclic di-GMP signaling in Dickeya dadantii. Molecular Plant-Microbe Interactions. 33(2):296-307. https://doi.org/10.1094/MPMI-07-19-0203-R.A newly developed Escherichia coli isolate panel from a cross section of U.S. animal production systems reveals geographic and commodity-based differences in antibiotic resistance gene carriage
                                                        

- (Peer Reviewed Journal)Ducey, T.F., Durso, L.M., Ibekwe, A.M., Dungan, R.S., Jackson, C.R., Frye, J.G., Castleberry, B., Rashash, D.M., Rothrock Jr, M.J., Boykin, D.L., Whitehead, T.R., Ramos, Z.D., McManus, M.N., Cook, K.L. 2020. A newly developed Escherichia coli isolate panel from a cross section of U.S. animal production systems reveals geographic and commodity-based differences in antibiotic resistance gene carriage. Journal of Hazardous Materials. 382. https://doi.org/10.1016/j.jhazmat.2019.120991.A feed-forward signalling circuit controls bacterial virulence through linking cyclic di-GMP and two mechanistically distinct sRNAs, ArcZ and RsmB
                                                        

- (Peer Reviewed Journal)Yuan, X., Zeng, Q., Khokhani, D., Tian, F., Severin, G.B., Waters, C.M., Xu, J., Zhou, X., Sundin, G.W., Ibekwe, A.M., Liu, F., Yang, C. 2019. A feed-forward signalling circuit controls bacterial virulence through linking cyclic di-GMP and two mechanistically distinct sRNAs, ArcZ and RsmB. Environmental Microbiology. https://doi.org/10.1111/1462-2920.14603.Bioconversion of agricultural wastes from the livestock industry for biofuel and feed production
                                                        

- (Book / Chapter)Murry, M.A., Murinda, S.E., Huang, S., Ibekwe, A.M., Schwartz, G., Lundquist, T. 2019. Bioconversion of agricultural wastes from the livestock industry for biofuel and feed production. In: Hosseini, M., editor. Advanced Bioprocessing for Alternative Fuels, Biobased Chemicals, and Bioproducts. United Kingdom:Woodhead Publishing. p. 225-247. https://doi.org/10.1016/B978-0-12-817941-3.00012-7.Shiga Toxin-producing Escherichia coli in Mastitis: An international perspective
                                                        

- (Peer Reviewed Journal)Murinda, S.E., Ibekwe, A.M., Rodriguez, N.G., Quiroz, K.L., Mujica, A.P., Osmon, K. 2019. Shiga Toxin-producing Escherichia coli in Mastitis: An international perspective. Foodborne Pathogens and Disease. 16(4):229-243. https://doi.org/10.1089/fpd.2018.2491.Continuous flow-constructed wetlands for the treatment of swine waste water
                                                        

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E. 2018. Continuous flow-constructed wetlands for the treatment of swine waste water. International Journal of Environmental Research and Public Health. 15(7):1369. https://doi.org/10.3390/ijerph15071369.Characterization of bacterial communities and their antibiotic resistance profiles in wastewaters obtained from pharmaceutical facilities in Lagos and Ogun States, Nigeria
                                                        

- (Peer Reviewed Journal)Obayiuwana, A., Ogunjobi, A., Yang, M., Ibekwe, A.M. 2018. Characterization of bacterial communities and their antibiotic resistance profiles in wastewaters obtained from pharmaceutical facilities in Lagos and Ogun States, Nigeria. International Journal of Environmental Research and Public Health. 15(7):1365. https://doi.org/10.3390/ijerph15071365.Influence of Bacillus subtilis B068150 on cucumber rhizosphere microbial composition as a plant protective agent
                                                        

- (Peer Reviewed Journal)Li, L., Ma, J., Ibekwe, A.M., Wang, Q., Yang, C. 2018. Influence of Bacillus subtilis B068150 on cucumber rhizosphere microbial composition as a plant protective agent. Plant and Soil. 429(1):519-531. https://doi.org/10.1007/s11104-018-3709-3.Impact of treated wastewater for irrigation on soil microbial communities

- (Peer Reviewed Journal)Ibekwe, A.M., Gonzalez-Rubio, A., Suarez, D.L. 2017. Impact of treated wastewater for irrigation on soil microbial communities. Science of the Total Environment. 622:1603-1610. https://doi.org/10.1016/j.scitotenv.2017.10.039.Fingerprints of resistant Escherichia coli O157:H7 from vegetables and environmental samples
                                                        

- (Peer Reviewed Journal)Abakpa, G.O., Umoh, V.J., Kamaruzaman, S., Ibekwe, A.M. 2017. Fingerprints of resistant Escherichia coli O157:H7 from vegetables and environmental samples. Journal of the Science of Food and Agriculture. 98(1):80-86. https://doi.org/10.1002/jsfa.8441.Microbial diversity of bacteria, archaea, and fungi communities in a continuous flow constructed wetland for the treatment of swine waste

- (Peer Reviewed Journal)Ibekwe, A.M., Ma, J., Murinda, S., Reddy, G.B. 2017. Microbial diversity of bacteria, archaea, and fungi communities in a continuous flow constructed wetland for the treatment of swine waste. Hydrology: Current Research. 8(2):1-8. doi: 10.4172/2157-7587.1000277.Microbial community structures in algae cultivation ponds for bioconversion of agricultural wastes from livestock industry for feed production

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E., Murry, M.A., Shwartz, G., Lundquist, T. 2016. Microbial community structures in algae cultivation ponds for bioconversion of agricultural wastes from livestock industry for feed production. Science of the Total Environment. 580(2017):1185-1196. doi: 10.1016/j.scitotenv.2016.12.076.Seasonal induced changes in spinach rhizosphere microbial community structure with varying salinity and drought

- (Peer Reviewed Journal)Ibekwe, A.M., Ors, S., Ferreira, J.F., Liu, X., Suarez, D.L. 2016. Seasonal induced changes in spinach rhizosphere microbial community structure with varying salinity and drought. Science of the Total Environment. 579:1485-1495. doi: 10.1016/j.scitotenv.2016.11.151.Topological data analysis of Escherichia coli O157:H7 and non-O157 survival in soils

- (Peer Reviewed Journal)Ibekwe, A.M., Ma, J., Crowley, D.E., Yang, C., Johnson, A.M., Petrossian, T.C., Lum, P.Y. 2016. Topological data analysis of Escherichia coli O157:H7 and non-O157 survival in soils. Frontiers in Microbiology. 1-11. doi: 10.3389/fcimb.2014.00122.Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Yang, C., Crowley, D.E. 2016. Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations. Science of the Total Environment. 563:199-209. doi: 10.1016/j.scitotenv.2016.04.122.Potential pathogens, antimicrobial patterns, and genotypic diversity of Escherichia coli isolates in constructed wetlands treating swine wastewater

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E., Debroy, C., Reddy, G.B. 2016. Potential pathogens, antimicrobial patterns, and genotypic diversity of Escherichia coli isolates in constructed wetlands treating swine wastewater. FEMS Microbiology Ecology. 92:fiw006. doi: 10.1093/femsec/fiw006.Cucumber rhizosphere microbial community response to biocontrol agent Bacillus subtilis B068150

- (Peer Reviewed Journal)Li, L., Ma, J., Ibekwe, A.M., Wang, Q., Yang, C. 2015. Cucumber rhizosphere microbial community response to biocontrol agent Bacillus subtilis B068150. Agriculture. 6(2):1-15. doi: 10.3390/agriculture6010002.Bacterial community dynamics in surface flow constructed wetlands for the treatment of swine waste

- (Peer Reviewed Journal)Ibekwe, A.M., Ma, J., Murinda, S., Reddy, G.B. 2015. Bacterial community dynamics in surface flow constructed wetlands for the treatment of swine waste. Science of the Total Environment. 544:68-76. doi: 10.1016/j.scitotenv.2015.11.139.Molecular methods for assessment of antibiotic resistance in agricultural ecosystems: prospects and challenges

- (Review Article)Luby, E., Ibekwe, A.M., Zilles, J., Pruden, A. 2016. Molecular methods for assessment of antibiotic resistance in agricultural ecosystems: prospects and challenges. Journal of Environmental Quality. 45:441-453. doi: 10.2134/jeq2015.07.0367.Prevalence and antimicrobial susceptibility of pathogenic Escherichia coli O157 in fresh produce obtained from irrigated fields

- (Peer Reviewed Journal)Abakpa, G.O., Umoh, V.J., Ameh, J.B., Yakubu, S.E., Ibekwe, A.M. 2015. Prevalence and antimicrobial susceptibility of pathogenic Escherichia coli O157 in fresh produce obtained from irrigated fields. Environmental Technology & Innovation. 4:1-7. doi: 10.1016/j.eti.2015.03.003.Occurrence of enteric pathogens on fresh produce grown on irrigated soils

- (Peer Reviewed Journal)Abakpa, G.O., Umoh, V.J., Ameh, J.B., Yakubu, S.E., Kwaga, J.K., Ibekwe, A.M. 2014. Occurrence of enteric pathogens on fresh produce grown on irrigated soils. British Microbiology Research Journal. 6(1):13-23.Persistence of Escherichia coli O157 and non-O157 strains in agricultural soils

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Crowley, D.E., Yang, C. 2014. Persistence of Escherichia coli O157 and non-O157 strains in agricultural soils. Science of the Total Environment. 490:822-829.Real-time isothermal detection of Shiga toxin-producing Escherichia coli using recombinase polymerase amplification

- (Peer Reviewed Journal)Murinda, S.E., Ibekwe, A.M., Zulkaffly, S., Cruz, A., Park, S., Razak, N., Paudzai, F.M., Ab Samad, L., Baquir, K., Muthaiyah, K., Santiago, B., Rusli, A., Balkcom, S. 2014. Real-time isothermal detection of Shiga toxin-producing Escherichia coli using recombinase polymerase amplification. Foodborne Pathogens and Disease. 11(7):529-536.A glimpse of Escherichia coli O157:H7 survival in soils from eastern China

- (Peer Reviewed Journal)Wang, H., Ibekwe, A.M., Ma, J., Wu, L., Lou, J., Wu, Z., Liu, R., Xu, J., Yates, S.R. 2014. A glimpse of Escherichia coli O157:H7 survival in soils from eastern China. Science of the Total Environment. 476-477:49-56.Potential human pathogenic bacteria in a mixed urban watershed as revealed by pyrosequencing

- (Peer Reviewed Journal)Ibekwe, A.M., Leddy, M., Murinda, S.E. 2013. Potential human pathogenic bacteria in a mixed urban watershed as revealed by pyrosequencing. PLoS One. DOI: 10.1371/journal.pone.0079490.Assessing the diversity and composition of bacterial communities across a wetland, transition, upland gradient in Macon County Alabama
                                                        

- (Peer Reviewed Journal)Shange, R., Haugabrooks, E.M., Ankumah, R.O., Ibekwe, A.M., Smith, R.C., Dowd, S. 2013. Assessing the diversity and composition of bacterial communities across a wetland, transition, upland gradient in Macon County Alabama. Diversity. 5(3):461-478.Influence of bacterial communities based on 454-pyrosequencing on the survival of Escherichia coli O157:H7 in soils

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Yang, C., Crowley, D.E. 2013. Influence of bacterial communities based on 454-pyrosequencing on the survival of Escherichia coli O157:H7 in soils. FEMS Microbiology Ecology. 84(3):542-554.Persistence of Escherichia coli O157:H7 in major leafy green producing soils

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Crowley, D.E., Yang, C-H. 2012. Persistence of Escherichia coli O157:H7 in major leafy green producing soils. Environmental Science and Technology. 46:12154-12161.A framework for developing research protocols for evaluation of microbial hazards and controls during production that pertain to the quality of agricultural water contacting fresh produce that may be consumed raw

- (Peer Reviewed Journal)Harris, L.J., Bihn, E.A., Bender, J., Blessington, T., Danyluk, M.D., Delaquis, P., Ibekwe, A.M., Goodridge, L., Ilic, S., Kniel, K., Lejeune, J.T., Schaffner, D., Stoeckel, D., Suslow, T. 2012. A framework for developing research protocols for evaluation of microbial hazards and controls during production that pertain to the quality of agricultural water contacting fresh produce that may be consumed raw. Journal of Food Protection. 75(12):2251-2273.Distinct soil bacterial communities revealed under a diversely managed agroecosystem

- (Peer Reviewed Journal)Shange, R.S., Ankumah, R.O., Ibekwe, A.M., Zabawa, R., Dowd, S.E. 2012. Distinct soil bacterial communities revealed under a diversely managed agroecosystem. PLoS One. 7(7):e40338. doi:10.1371/journal.pone.0040338.Assimilable organic carbon (AOC) in soil water extracts using Vibrio Harveyi BB721 and its implication for microbial biomass

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Wang, H., Xu, J., Leddy, M., Yang, C., Crowley, D.E. 2012. Assimilable organic carbon (AOC) in soil water extracts using Vibrio Harveyi BB721 and its implication for microbial biomass. PLoS One. 7(5): e28519. DOI: 10.1371/journal.pone.0028519.Microbiological evaluation of water quality from urban watersheds for domestic water supply improvement

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E., Graves, A.K. 2011. Microbiological evaluation of water quality from urban watersheds for domestic water supply improvement. International Journal of Environmental Research and Public Health. 8:4460-4476.Bacterial community composition in low-flowing river water with different sources of pollutants

- (Peer Reviewed Journal)Ibekwe, A.M., Leddy, M.B., Bold, R.M., Graves, A.K. 2011. Bacterial community composition in low-flowing river water with different sources of pollutants. FEMS Microbiology Ecology. 79:155-166.Bacterial community composition and structure in an urban river impacted by different pollutant sources

- (Peer Reviewed Journal)Ibekwe, A.M., Ma, J., Murinda, S.E. 2016. Bacterial community composition and structure in an urban river impacted by different pollutant sources. Science of the Total Environment. 566-567:1176-1185. doi: 10.1016/jscitotenv.2016.05.168.Variations of indicator bacteria in a large urban watershed

- (Peer Reviewed Journal)Ibekwe, A.M., Lesch, S.M., Bold, R.M., Leddy, M.B., Graves, A.K. 2011. Variations of indicator bacteria in a large urban watershed. Transactions of the ASABE. 54(6):2227-2236.Persistence of escherichia coli O157:H7 and its mutants in soils

- (Peer Reviewed Journal)Ma, J., Ibekwe, A.M., Yi, X., Wang, H., Yamazaki, A., Crowley, D.E., Yang, C. 2011. Persistence of escherichia coli O157:H7 and its mutants in soils. PLoS One. 6(8):1-8.Effects of Fumigants on Microbial Diversity and Persistence of E. coli O15:H7 in Contrasting Soil Microcosms

- (Peer Reviewed Journal)Ibekwe, A.M., Ma, J. 2011. Effects of Fumigants on Microbial Diversity and Persistence of E. coli O15:H7 in Contrasting Soil Microcosms. Science of the Total Environment. Available: http://www.sciencedirect.com/science/article/pii/S0048969711006589.Genetic diversity and antimicrobial resistance of Escherichia coli from human and animal sources uncovers multiple resistances from human sources

- (Peer Reviewed Journal)Ibekwe, A.M., Murinda, S.E., Graves, A.K. 2011. Genetic diversity and antimicrobial resistance of Escherichia coli from human and animal sources uncovers multiple resistances from human sources. PLoS One. 6(6):1-12.Commensal effect of pectate lyases secreted from Dickeya dadantii on the proliferation of Escherichia coli O157:H7 on lettuce leaves

- (Peer Reviewed Journal)Yamazaki, A., Li, J., Hutchins, W.C., Wang, L., Ma, J., Ibekwe, A.M., Yang, C. 2011. Commensal effect of pectate lyases secreted from Dickeya dadantii on the proliferation of Escherichia coli O157:H7 on lettuce leaves. Applied and Environmental Microbiology. 77(1):156-162.Quantification of persistence of Escherichia coli O157:H7 in contrasting soils

- (Peer Reviewed Journal)Ibekwe, A.M., Papiernik, S.K., Grieve, C.M., Yang, C. 2010. Quantification of persistence of Escherichia coli O157:H7 in contrasting soils. Internationl Journal of Microbiology. Available: http://www.hindawi.com/journals/ijmb/2011/421379.html.Influence of Soil fumigation by Methyl Bromide and Methyl Iodide on Rhizosphere and Phyllosphere Microbial Community Structure

- (Peer Reviewed Journal)Ibekwe, A.M., Papiernik, S.K., Yang, C. 2010. Influence of Soil Fumigation by Methyl Bromide and Methyl Iodide on Rhizosphere and Phyllosphere Microbial Community Structure. Journal of Environmental Science and Health. 45(5):427-436.Regulatory mechanisms of exoribonuclease PNPase and regulatory small RNA on T3SS of dickeya dadantii

- (Peer Reviewed Journal)Zeng, Q., Ibekwe, A.M., Biddle, E., Yang, C.H. 2010. Regulatory mechanisms of exoribonuclease PNPase and regulatory small RNA on T3SS of dickeya dadantii. Molecular Plant-Microbe Interactions. 23(10):1345-1355.Influence of fumigants on soil microbial diversity and survival of E. coli O157:H7

- (Peer Reviewed Journal)Ibekwe, A.M., Papiernik, S.K., Grieve, C.M., Yang, C. 2010. Influence of fumigants on soil microbial diversity and survival of E. coli O157:H7. Journal of Environmental Science and Health. 45(5):416-426.Bacterial diversity in cucumber (Cucumis sativus) rhizosphere in response to salinity, soil pH and boron

- (Peer Reviewed Journal)Ibekwe, A.M., Poss, J.A., Grattan, S.R., Grieve, C.M., Suarez, D.L. 2010. Bacterial diversity in cucumber (Cucumis sativus) rhizosphere in response to salinity, soil pH and boron. Soil Biology and Biochemistry. 42(4):567-575.Persistence of Escherichia coli 0157:H7 on the Rhizosphere and Phyllosphere of lettuce.

- (Peer Reviewed Journal)Ibekwe, A.M., Grieve, C.M., Papiernik, S.K., Yang, C.H. 2009. Persistence of Escherichia coli 0157:H7 on the Rhizosphere and Phyllosphere of lettuce. Letters in Applied Microbiology. 49:784-790.An assessment of environmental conditions for control of downy brome by Pseudomonas fluorescens D7

- (Peer Reviewed Journal)Ibekwe, A.M., Kennedy, A.C., Stubbs, T. 2010. An assessment of environmental conditions for control of downy brome by Pseudomonas fluorescens D7. International Journal of Environmental Technology and Management(IJETM). 12:27-46.Microbiological Evaluation of fecal bacterial Composition from surface water through Aquifer Sand Material

- (Peer Reviewed Journal)Ibekwe, A.M., Lyon, S.R. 2008. Microbiological Evaluation of fecal bacterial Composition from surface water through Aquifer Sand Material. Journal of Water and Health. Vol 6 No 3:411-421CHARACTERIZATION OF DEVELOPING MICROBIAL COMMUNITIES IN MOUNT ST. HELEN'S PYROCLASTIC SUBSTRATE

- (Peer Reviewed Journal)Ibekwe, A.M., Kennedy, A.C., Halvorson, J.J., Yang, C. 2007. Characterization of developing microbial communities in Mount St. Helen's pyroclastic substrate. Soil Biology and Biochemistry. Vol 39:2496-2507SURVIVAL OF ESCHERICHIA COLI O157:H7 IN SOIL AND ON LETTUCE AFTER FUMIGATION

- (Peer Reviewed Journal)Ibekwe, A.M., Grieve, C.M., Yang, C. 2007. Survival of Escherichia Coli O157:H7 in soil and on lettuce after fumigation. Canadian Journal of Microbiology. Vol. 53:623-635GLOBAL EFFECT OF INDOLE-3-ACETIC ACID BIOSYNTHESIS ON MULTIPLE VIRULENCE FACTORS OF ERWINIA CHRYSANTHEMI 3937

- (Peer Reviewed Journal)Yang, S., Zhang, Q., Chorkowski, A.O., Glick, B.R., Ibekwe, A.M., Cooksey, D.A., Yang, C.H. 2007. Global effect of indole-3-acetic acid biosynthesis on multiple virulence factors of erwinia chrysanthemi 3937. Applied and Environmental Microbiology.  Feb 2007: 1079-1088Fate of E. coli O157:H7 in the Environment

- (Abstract Only)Ibekwe, A.M. 2006. Fate of E. coli O157:H7 in the Environment. Soil Science Society of America Annual Meeting in Indianapolis, IN Nov 12-16, 2006.  Paper No. 88-4Bacterial Composition in Urban Watershed Creeks Impacted by Contaminants from different Sources.

- (Abstract Only)Ibekwe, A.M., Lyon, S.R. 2006. Bacterial Composition in Urban Watershed Creeks Impacted by Contaminants from different Sources. Soil Science Society of America Annual Meeting in Indianapolis, IN Nov 12-16, 2006.  Paper No. 186-2Soil Diversity Along a Forest Profile Using PCR-DGGE

- (Abstract Only)Thompson, M., Moss, E., Ibekwe, A.M., Senwo, Z., Taylor, R. 2006. Soil Diversity Along a Forest Profile Using PCR-DGGE. Soil Science Society of America Annual Meeting in Indianapolis, IN Nov 12-16, 2006.  CD-ROMEvaluation of the Effects of Tillage on Selected Soil Enzyme Activities and Soil Microbial Diversity

- (Abstract Only)Durant, M., Ankumah, R., Corley, M., Ibekwe, A.M., Mcintyre, S.C. 2006. Evaluation of the Effects of Tillage on Selected Soil Enzyme Activities and Soil Microbial Diversity. Soil Science Society of America Annual Meeting in Indianapolis, IN Nov 12-16, 2006.  CD-ROMEvaluation of the Effect of Arsenic Contamination on Selected Soil Enzyme Activities and Microbial Diversity

- (Abstract Only)Garuba, I., Ankumah, R., Ibekwe, A.M., Corley, M., Egnin, M. 2006. Evaluation of the Effect of Arsenic Contamination on Selected Soil Enzyme Activities and Microbial Diversity. Soil Science Society of America Annual Meeting in Indianapolis, IN Nov 12-16, 2006.  CD-ROM.MICROBIAL CHARACTERISTICS THROUGH DRINKING WATER AQUIFER SAND MATERIAL

- (Peer Reviewed Journal)Ibekwe, A.M., Lyon, S.R. 2007. Microbial characteristics through drinking water aquifer sand material. Engineering in Life Sciences. 1:81-89Quantification of survival of Escherichia coli 0157:H7 on Plants affected by Contaminated Irrigation Water

- (Peer Reviewed Journal)Ibekwe, A.M., Shouse, P.J., Grieve, C.M. 2006. Quantification of survival of Escherichia Coli 0157:H7 on Plants affected by Contaminated Irrigation Water. Engineering in Life Sciences. Vol. 6:566-572IMPACT OF PLANT DENSITY AND MICROBIAL COMPOSITION ON WATER QUALITY FROM A FREE WATER SURFACE CONSTRUCTED WETLAND

- (Peer Reviewed Journal)Ibekwe, A.M., Lyon, S.R., Leddy, M., Jacobson-Meyers, M. 2007. Impact of plant density and microbial composition on water quality from a free water surface constructed wetland. Journal of Applied Microbiology.  102:921-936IMPACT OF PLANT DENSITY AND MICROBIAL COMPOSITION ON WATER QUALITY FROM A FREE WATER SURFACE CONSTRUCTED WETLAND

- (Abstract Only)Ibekwe, A.M. 2006. Impact of plant density and microbial composition on water quality from a free water surface constructed wetland. American Society of Agronomy Abstracts, annual meeting, Salt Lake City, UT. [CD-ROM]PERSISTENCE OF ESCHERICHIA COLI O157:H7 IN SOIL AFTER FUMIGATIONS

- (Abstract Only)Ibekwe, A.M., Grieve, C.M., Yang, C.-. 2006. Persistence of escherichia coli O157:H7 in soil after fumigations. [CD-ROM] American Society for Microbiology Annual Meeting. Orlando, FL.REAL-TIME PCR QUANTIFICATION OF PERSISTENCE OF ESCHERICHIA COLI O157:H7 IN SOIL IMPACTED BY FUMIGATIONS

- (Abstract Only)Ibekwe, A.M., Grieve, C.M. 2006. Real-time pcr quantification of persistence of escherichia coli o157:h7 in soil impacted by fumigations. (Abstract) CD-ROM. Annual Quantitative Polymerase Chain Reaction (PCR) Meeting.IMPACT OF PLANT SPECIES AND DENSITY ON MICROBIAL COMMUNITY COMPOSITION IN A FREE WATER SURFACE CONSTRUCTED WETLAND

- (Abstract Only)Ibekwe, A.M., Leddy, M., Lyon, S.R., Jacobson, M. 2005. Impact of plant species and density on microbial community composition in a free water surface constructed wetland. American Society for Microbiology Annual Meeting.  CD-ROM, Atlanta, GA.DETERMINING RATE OF CHANGE IN CUCUMBER RHIZOSPHERE MICROBIAL COMMUNITY COMPOSITION IN RESPONSE TO SOIL PH, SALINITY, AND BORON

- (Proceedings)Ibekwe, A.M., Grieve, C.M., Poss, J.A., Grattan, S., Suarez, D.L. 2005. Determining rate of change in cucumber rhizosphere microbial community composition in response to soil pH, salinity, and boron. In: Proceedings of the International Salinity Forum, Managing Saline Soils and Water: Science, Technology, and Soil Issues.  April 25-27, 2005. Riverside, CA pp:77-80.PERSISTENCE OF ESCHERICHIA COLI O157:H7 IN RHIZOSPHERE AND NON-RHIZOSPHERE SOILS AFTER FUMIGATION

- (Abstract Only)Ibekwe, A.M. 2005. Persistence of Escherichia coli O157:H7 in rhizosphere and non-rhizosphere soils after fumigation. International Union of Microbiological Societies Proceedings/Abstracts. Page 18.FATE OF ESCHERICHIA COLI O157:H7 IN IRRIGATION WATER ON SOILS AND PLANTS

- (Proceedings)Ibekwe, A.M., Watt, P.M., Shouse, P.J., Grieve, C.M. 2005. Fate of escherichia coli o157:h7 in irrigation water on soils and plants. In: First International Conference on Environmental Science and Technology, January 23-26, 2005, New Orleans, LA. 2:11-17.IMPACT OF DAIRY PRODUCTION ON MICROBIAL CHARACTERISTICS THROUGH DRINKING WATER AQUIFER MATERIAL

- (Proceedings)Ibekwe, A.M., Lyon, S. 2005. Impact of dairy production on microbial characteristics through drinking water aquifer material. In: Proceedings of First International Conference on Environmental Science and Technology, January 23-26, 2005, New Orleans, Louisiana. 1:215-221.FATE OF ESCHERICHIA COLI O157:H7 IN IRRIGATION WATER ON SOILS AND PLANTS AS VALIDATED BY CULTURE METHOD AND REAL-TIME PCR

- (Peer Reviewed Journal)Ibekwe, A.M., Watt, P.M., Shouse, P.J., Grieve, C.M. 2005. Fate of Escherichia coli O157:H7 in irrigation water on soils and plants as validated by culture method and real-time PCR. Canadian Journal of Microbiology. 50:1007-1014.ENRICHMENT AND MOLECULAR CHARACTERIZATION OF CHLOROPICRIN- AND METAM-SODIUM-DEGRADING MICROBIAL COMMUNITIES

- (Peer Reviewed Journal)Ibekwe, A.M., Papiernik, S.K., Yang, C. 2004. Enrichment and molecular characterization of chloropicrin- and metam-sodium-degrading microbial communities. Applied Microbiology and Biotechnology. 66:325-332.GENOME-WIDE IDENTIFICATION OF PLANT-UP-REGULATED GENES OF ERWINIA CHRYSANTHEMI 3937 USING A GFP BASED IVET LEAF ARRAY

- (Peer Reviewed Journal)Yang, S., Perna, N.T., Coksey, D.A., Okinaka, Y., Lindow, S.E., Ibekwe, A.M., Keen, N.T., Yang, C.H. 2004. Genome-wide identification of plant-up-regulated genes of erwinia chrysanthemi 3937 using a gfp based ivet leaf array. Molecular Plant Microbe Interactions. 2004. 17(9):999-1008.IMPACT OF DAIRY PRODUCTION ON MICROBIAL CHARACTERISTICS THROUGH DRINKING WATER AQUIFER MATERIALS

- (Abstract Only)Ibekwe, A.M., Lyon, S. 2004. Impact of dairy production on microbial characteristics through drinking water aquifer materials. (CD-ROM). American Society for Microbiology Annual Conference, New Orleans, LA. May, 2004.CHANGES IN DEVELOPING PLANT MICROBIAL COMMUNITY STRUCTURE AS AFFECTED BY CONTAMINATED IRRIGATION WATER

- (Peer Reviewed Journal)Ibekwe, A.M., Grieve, C.M. 2004. Changes in developing plant microbial community structure as affected by contaminated irrigation water. Journal of Microbiological Methods. 48:239-248.EFFECTS OF FUMIGANTS ON NON-TARGET ORGANISMS IN SOILS

- (Book / Chapter)Ibekwe, A.M. 2004. Effects of fumigants on non-target organisms in soils. In: Sparks, D.L., editor. Advances in Agronomy. Vol. 83. San Diego, CA:Academic Press. p. 1-35.IDENTIFYING AND QUANTIFYING SOURCES OF BACTERIA

- (Proceedings)Ibekwe, A.M., Jenkins, M. 2004. Identifying and quantifying sources of bacteria. In: Hargrove, W.L., editor. Pathogens in the Environment Workshop Proceedings, Feb. 23-25, 2004, Kansas City, MO. p. 18-21.IMPACT OF FUMIGANTS ON SOIL BACTERIA AND E. COLI O157:H7

- (Abstract Only)Ibekwe, A.M., Watt, P.M., Papiernik, S.K. 2003. Impact of fumigants on soil bacteria and E. coli O157:H7. (CD-ROM) American Society of Agronomy Annual Meeting. Denver, CO, November, 2003.CONSTRUCTED WETLANDS FOR THE REMOVAL OF CONTAMINANTS

- (Proceedings)Ibekwe, A.M., Lyon, S.R. 2003. Constructed wetlands for the removal of contaminants. Proceedings of Watershed Management Conference, Total Maximum Daily Load (TMDL) Environmental Regulations-II:477-485.CHARACTERIZATION OF MICROBIAL COMMUNITIES AND COMPOSITION IN  CONSTRUCTED DAIRY WETLAND WASTEWATER EFFLUENT

- (Peer Reviewed Journal)Ibekwe, A.M., Grieve, C.M., Lyon, S.R. 2003. Characterization of microbial communities and composition in constructed dairy wetland wastewater effluent. Applied and Environmental Microbiology. 69(9):5060-5069.IMPACT OF FUMIGANTS ON THE SURVIVAL OF ESCHERICHIA COLI O157:H7 IN ANIMAL MANURE

- (Proceedings)Ibekwe, A.M., Papiernik, S.K., Grieve, C.M. 2003. Impact of fumigants on the survival of escherichia coli o157:h7 in animal manure. Abstract. 103rd General Meeting of the American Society for Microbiology, Washington, DC. May 18-22, 2003.  P. 596.EFFECT OF ORGANIC MULCHES ON SOIL MICROBIAL ACTIVITIES AND COMMUNITIES ONE YEAR AFTER APPLICATON

- (Peer Reviewed Journal)YANG, Y., DUNGAN, R.S., IBEKWE, A.M., VALENZUELA-SOLANO, C., CROHN, D.M., CROWLEY, D.E. 2003. EFFECT OF ORGANIC MULCHES ON SOIL MICROBIAL ACTIVITIES AND COMMUNITIES ONE YEAR AFTER APPLICATON. BIOLOGY AND FERTILITY OF SOILS. 38:273-281.EFFECT OF PROPARGYL BROMIDE AND 1,3-DICHLOROPROPENE ON SOIL MICROBIAL COMMUNITIES

- (Peer Reviewed Journal)DUNGAN, R.S., IBEKWE, A.M., YATES, S.R. EFFECT OF PROPARGYL BROMIDE AND 1,3-DICHLOROPROPENE ON SOIL MICROBIAL COMMUNITIES. 2003. FEDERATION OF EUROPEAN MICROBIOLOGICAL SOCIETIES (FEMS) MICROBIOLOGY ECOLOGY. 43:75-87.MULTIPLEX FLUOROGENIC REAL-TIME (TAQMAN) PCR FOR DETECTION AND             QUANTIFICATION OF ESCHERICHIA COLI O157:H7 IN DAIRY WASTEWATER WETLANDS

- (Peer Reviewed Journal)LIPIDS AS BIOLOGICAL INDICATORS OF SOIL

- (Abstract Only)MICROBIAL COMMUNITY CHANGES WITH AMENDMENTS

- (Abstract Only)FATTY ACID METHYL ESTER (FAME) PROFILES AS A TOOL TO INVESTIGATE COMMUNITY STRUCTURE OF TWO AGRICULTURAL SOILS

- (Peer Reviewed Journal)CHARACTERIZATION OF MICROBIAL COMMUNITIES IN MOUNT ST. HELENS PYROCLASTIC  SUBSTRATE USING FAME ANALYSES

- (Abstract Only)PHOSPHOLIPID FATTY ACID PROFILES AND CARBON UTILIZATION PATTERNS FOR ANALYSIS OF MICROBIAL COMMUNITY STRUCTURE UNDER FIEDLD AND GREENHOUSE CONDITIONS

- (Peer Reviewed Journal)CHARACTERIZATION OF MICROBIAL COMMUNITIES IN MOUNT ST. HELENS PYROCLASTIC  SUBSTRATE USING FAME ANALYSES

- (Abstract Only)Frohne, P.S. Havorson, J., Ibekwe, A.M., and Kennedy, A.C. Characterization of microbial communities in Mount St. Helens pyroclastic substrate using FAME analyses. Ecol. Soc. Amer. Abstracts. Spokane, WA. p. 251. 1999.
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