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[Enrichment of Antibiotic Resistant Bacteria and Antibiotic Resistance Genes by Sulfamethoxazole in the Biological Treatment System of Mariculture Wastewater].

Huan Jing Ke Xue 2021 Aug;42(8):3791-3798

College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.

Although antibiotics are heavily used in mariculture, only a small portion of the added antibiotics is absorbed. Little is known about the response process of antibiotics, antibiotic resistant bacteria, and antibiotic resistance genes to antibiotic-containing wastewater entering a wastewater treatment system. In this study, an anoxic/aerobic moving bed biofilm reactor (A/O-MBBR) was used to treat marine aquaculture wastewater containing sulfamethoxazole (SMX). Read More

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Impact of organics, aeration and flocs on NO emissions during granular-based partial nitritation-anammox.

Sci Total Environ 2021 Jul 16;797:149092. Epub 2021 Jul 16.

BioCo Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000, Ghent, Belgium. Electronic address:

Partial nitration-anammox is a resource-efficient technology for nitrogen removal from wastewater. However, the advantages of this nitrogen removal technology are challenged by the emission of NO, a potent greenhouse gas. In this study, a granular sludge one-stage partial nitritation-anammox reactor comprising granules and flocs was run for 337 days in the presence of influent organics to investigate its effect on N removal and NO emissions. Read More

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Effect of slow pyrolysis conditions on biocarbon yield and properties: Characterization of the volatiles.

Bioresour Technol 2021 Jul 16;338:125567. Epub 2021 Jul 16.

Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117 Budapest, Hungary. Electronic address:

Slow pyrolysis of spruce and birch was performed at various heating programs and conditions in a horizontal quartz tube reactor heated by an electric furnace. The effects of feedstock and carbonization conditions on the yield of biocarbon, liquid and gaseous products were studied. The thermal properties, volatile matter (VM) content and the evolution profiles of volatiles from the biocarbons were characterized by thermogravimetry/mass spectrometry. Read More

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An effective strategy for in situ start-up of mainstream anammox process treating domestic sewage.

Bioresour Technol 2021 Jul 9;339:125525. Epub 2021 Jul 9.

National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China. Electronic address:

The feasibility of in situ start-up of mainstream anammox process was investigated in three parallel sequencing batch biofilm reactors (SBBRs) inoculated with nitrification sludge, partial nitrification sludge, and denitrifying phosphorus removal sludge, respectively. The SBBRs were operated under alternate anaerobic/aerobic/anoxic pattern at ambient temperature (16.5-26. Read More

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Mercury Adsorption Characteristics of Carbon Sorbent with Low Surface Area.

J Air Waste Manag Assoc 2021 Jul 22. Epub 2021 Jul 22.

Department of Environmental Engineering, Chungbuk National University, Cheongju, Korea.

Several studies have been conducted to decrease the cost of sorbents used for the control of mercury emissions. Thus far, several sorbents with low surface areas have been reported to exhibit promising mercury removal capacities. However, based on the results reported, it is difficult to understand the mechanisms of adsorption and oxidization of elemental mercury on sorbents with low surface areas compared to those with higher surface areas. Read More

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Temperature and immigration effects on quorum sensing in the biofilms of anaerobic membrane bioreactors.

J Environ Manage 2021 Sep 11;293:112947. Epub 2021 Jun 11.

School of Engineering, Newcastle University, Newcastle, NE1 7RU, UK.

Quorum sensing (QS), a microbial communication mechanism modulated by acyl homoserine lactone (AHL) molecules impacts biofilm formation in bioreactors. This study investigated the effects of temperature and immigration on AHL levels and biofouling in anaerobic membrane bioreactors. The hypothesis was that the immigrant microbial community would increase the AHL-mediated QS, thus stimulating biofouling and that low temperatures would exacerbate this. Read More

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September 2021

Subcritical water pretreatment for agave bagasse fractionation from tequila production and enzymatic susceptibility.

Bioresour Technol 2021 Jul 14;338:125536. Epub 2021 Jul 14.

Biorefinery Group, Food Research Department, Faculty of Chemistry Sciences, Autonomous University of Coahuila, Saltillo, Coahuila 25280, Mexico. Electronic address:

This work focuses on the effect of subcritical water pretreatment conditions on agave bagasse chemical composition, biomass fractionation, and enzymatic hydrolysis obtained from the different tequila production processes. The pretreatment was carried out in a batch pressurized reactor within an isothermal regime. The operational conditions for subcritical water pretreatment were (150-190 °C) and (10-50 min). Read More

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Evaluation of biochar addition and circulation control strengthening measures on efficiency and microecology of food waste treatment in anaerobic reactor.

J Environ Manage 2021 Jul 16;297:113215. Epub 2021 Jul 16.

Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, 15 Yucai Road, Guilin, 541004, PR China.

The process of strengthening an expanded granular sludge blanket (EGSB) reactor under ammonia nitrogen stress conditions and by adopting three strengthening measures, namely, opening the circulation (OC), adding modified biochar (MB), adding modified biochar along with opening the circulation (MBOC), to treat food waste was studied. When the ammonia nitrogen concentration of influent increased to 1200 mg/L, the removal rate of COD reduced to about 75%, while the removal rate of ammonia nitrogen was about 6%. The average COD removal rate of the anaerobic reactor in the last 5 days of each operating cycle i. Read More

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Probing the degradation of pharmaceuticals in urine using MFC and studying their removal efficiency by UPLC-MS/MS.

J Pharm Anal 2021 Jun 30;11(3):320-329. Epub 2020 Apr 30.

Applied Environmental Biotechnology Laboratory, Birla Institute of Technology & Science (BITS), Pilani, 403726, Zuarinagar, India.

Nutrient recovery from source-separated human urine has attracted interest as it is rich in nitrogen and phosphorus that can be utilized as fertilizer. However, urine also contains pharmaceuticals, steroid hormones, etc. and their removal is crucial as they have detrimental effects on the environment and human health. Read More

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Design, Commissioning, and Performance Assessment of a Lab-Scale Bubble Column Reactor for Photosynthetic Biogas Upgrading with .

Ind Eng Chem Res 2021 Apr 8;60(15):5688-5704. Epub 2021 Apr 8.

Environmental Research Institute, MaREI Centre, University College Cork, Cork T23 XE10, Ireland.

The two-step bubble column-photobioreactor photosynthetic biogas upgrading system can enable simultaneous production of biomethane and value-added products from microalgae. However, due to the influence of a large number of variables, including downstream processes and the presence of microalgae, no unanimity has been reached regarding the performance of bubble column reactors in photosynthetic biogas upgrading. To investigate this further, the present work documents in detail, the design and commissioning of a lab-scale bubble column reactor capable of treating up to 16. Read More

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Insight into quorum sensing and microbial community of an anammox consortium in response to salt stress: From "Candaditus Brocadia" to "Candaditus Scalindua".

Sci Total Environ 2021 Jul 10;796:148979. Epub 2021 Jul 10.

Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China.

The shift of microbial community and signaling molecules release were studied to explore the potential mechanism of anammox consortium under salt stress. Due to increased salinity, the abundance of "Candidatus Brocadia" decreased from 29.5% to 1. Read More

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Simultaneous evaluation of the effect of mixing efficiency on power consumption and methane production in an anaerobic digester with different wastewaters.

Bioresour Technol 2021 Jul 13;338:125554. Epub 2021 Jul 13.

Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.

This study simultaneously examines the effect of mixing rate on power consumption and methane production in a stirrer anaerobic reactor. The numerical simulation is carried out using the finite volume approach and validated against available experimental data. The methane production rate is determined using governing equations in the anaerobic digestion (AD) process. Read More

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Novel insights into the enrichment of phenols from walnut shell pyrolysis loop: Torrefaction coupled fractional condensation.

Waste Manag 2021 Jul 14;131:462-470. Epub 2021 Jul 14.

Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China. Electronic address:

Enriching high-value chemicals from the pyrolysis of agricultural and forestry waste is an efficient way to achieve sustainable development and large-scale application of biomass pyrolysis. Phenols, as important chemical raw materials, spices and food additives, have attracted widespread attention. Herein, a novel technical route of torrefaction pretreatment combined with fractional condensation in pyrolysis loop was proposed to enrich the phenols in liquid products. Read More

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Increasing salinity concentrations determine the long-term participation of methanogenesis and sulfidogenesis in the biodigestion of sulfate-rich wastewater.

J Environ Manage 2021 Jul 14;296:113254. Epub 2021 Jul 14.

Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, 13.563-120, São Carlos, SP, Brazil.

The competition between sulfate-reducing bacteria (SRB) and methanogenic archaea (MA) depends on several factors, such as the COD/SO ratio, sensitivity to inhibitors and even the length of the operating period in reactors. Among the inhibitors, salinity, a characteristic common to diverse types of industrial effluents, can act as an important factor. This work aimed to evaluate the long-term participation of sulfidogenesis and methanogenesis in the sulfate-rich wastewater process (COD/SO = 1. Read More

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Nitrilase immobilization and transposition from a micro-scale batch to a continuous process increase the nicotinic acid productivity.

Biotechnol J 2021 Jul 16:e2100010. Epub 2021 Jul 16.

Univ. Grenoble Alpes, CEA, LITEN, DTCH, Laboratoire Composants et Systèmes Thermiques (LCST), Grenoble, F-38000, France.

In recent years, many biocatalytic processes have been developed for the production of chemicals and pharmaceuticals. In this context, enzyme immobilization methods have attracted attention for their advantages, such as continuous production and increased stability. Here, enzyme immobilization methods and a collection of nitrilases from biodiversity for the conversion of 3-cyanopyridine to nicotinic acid were screened. Read More

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Occurrence of aerobic denitrifying bacteria in integrated fixed film activated sludge system.

Chemosphere 2021 Jul 9;285:131504. Epub 2021 Jul 9.

Department of Sanitary Engineering, Faculty of Public Health, Mahidol University, Bangkok, 10400, Thailand.

Denitrification can be enhanced in the Integrated Fixed Film Activated System (IFAS) system by integrating media into the anoxic or aerobic zone. The simultaneous nitrification and denitrification (SND) in the biofilm layers has been reported in the aerobic zone of the IFAS system. In this study, two IFAS systems with Bioweb® media installed in the anoxic or aerobic reactor were operated in parallel to evaluate both anoxic denitrification or aerobic SND in the biofilm layers enhanced by fixed film media at three different nitrite and nitrate recirculation (NR) ratios of 75%, 100%, and 125%. Read More

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Enhancing autotrophic nitrogen removal with a novel dissolved oxygen-differentiated airlift internal circulation reactor: Long-term operational performance and microbial characteristics.

J Environ Manage 2021 Jul 12;296:113271. Epub 2021 Jul 12.

Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410004, China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan. Electronic address:

Autotrophic nitrogen removal (ANR) processes have not been widely applied in wastewater treatment due to their long start-up time and unstable performance. In this study, a novel dissolved oxygen-differentiated airlift internal circulation reactor was developed to enhance ANR from wastewater. During 200 days of continuous operation, the reactor start-up was achieved within 30 days; a high total nitrogen removal efficiency of 80% was achieved and stably maintained under an aeration rate of 0. Read More

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Combining biofilm and membrane flocculation to enhance simultaneous nutrients removal and membrane fouling reduction.

Sci Total Environ 2021 Jul 9;796:148922. Epub 2021 Jul 9.

Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China; Anhui Provincial Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei 230024, China. Electronic address:

The stability and processing capacity of membrane bioreactor can be improved with long sludge retention time. However, phosphorus removal will be markedly reduced under long sludge retention time and membrane fouling will be aggravated. Adding aluminum (Al) salt is a common way to achieve chemical phosphorus removal and membrane fouling reduction. Read More

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Long-term effectiveness of bioaugmentation with rumen culture in continuous anaerobic digestion of food and vegetable wastes under feed composition fluctuations.

Bioresour Technol 2021 Jul 8;338:125500. Epub 2021 Jul 8.

Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea. Electronic address:

Biogas plants treating food waste (FW) often experience feed load and composition fluctuations. In Korea, vegetable waste from the preparation of kimchi comprises over 20% of the total FW production during the Kimjang season. The large production of Kimjang waste (KW) can cause mechanical and operational problems in FW digesters. Read More

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Modeling and optimization of radish root extract drying as peroxidase source using spouted bed dryer.

Sci Rep 2021 Jul 13;11(1):14362. Epub 2021 Jul 13.

Department of Chemical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.

The main advantages of the dried enzymes are the lower cost of storage and longer time of preservation for industrial applications. In this study, the spouted bed dryer was utilized for drying the garden radish (Raphanus sativus L.) root extract as a cost-effective source of the peroxidase enzyme. Read More

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Data-Driven Modeling of a Pilot Plant Batch Reactor and Validation of a Nonlinear Model Predictive Controller for Dynamic Temperature Profile Tracking.

ACS Omega 2021 Jul 21;6(26):16714-16721. Epub 2021 Jun 21.

Department of Instrumentation and Control Engineering, Department of Mechatronics Engineering, and Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India.

Batch process plays a very crucial and important role in process industries. The increased operational flexibility and trend toward high-quality, low-volume chemical production has put more emphasis on batch processing. In this work, nonlinearities associated with the batch reactor process have been studied. Read More

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A large fixed bed reactor for MRI operando experiments at elevated temperature and pressure.

Rev Sci Instrum 2021 Apr;92(4):043711

Chemical Process Engineering (CVT), Faculty of Production Engineering (FB 4), University of Bremen, Leobener Straße 6, 28359 Bremen, Germany.

Recently, in situ studies using nuclear magnetic resonance (NMR) have shown the possibility to monitor local transport phenomena of gas-phase reactions inside opaque structures. Their application to heterogeneously catalyzed reactions remains challenging due to inherent temperature and pressure constraints. In this work, an NMR-compatible reactor was designed, manufactured, and tested, which can endure high temperatures and increased pressure. Read More

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The potentials of biofilm reactor as recourse for the recuperation of rare earth metals/elements from wastewater: a review.

Environ Sci Pollut Res Int 2021 Jul 7. Epub 2021 Jul 7.

Department of Microbial, Biochemical and Food Biotechnology, Faculty of Natural and Agricultural Sciences, University of the Free State, 205 Nelson Mandela Drive, Park West, Bloemfontein, 9301, South Africa.

Wastewater is nowadays increasingly receiving global attention as a resource much more than a problem due to its potential so serve as a resource recovery channel. In this regard, wastewater is gradually been transformed from being a cesspool to a "treasure pool." Among notable resources in the treasure pool, rare earth metals/elements (REEs) warrant focal investigation, both in terms of environmental abundance and biorecovery, due to their environmental impacts. Read More

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A Reduction Active Theranostic Nanoparticle for Enhanced Near-Infrared Imaging and Phototherapy by Reducing Glutathione Level in Cancer Cells.

J Nanosci Nanotechnol 2021 12;21(12):5965-5971

Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, Hubei Engineering Research Center for Advanced Fine Chemicals , School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430205, P. R. China.

Facile preparation of a tumoral-stimuli-activated theranostic nanoparticle with simple constituents remains a challenge for tumor theranostic nanosystems. Herein we design a simple reductionresponsive turn-on theranostic nanoparticle for achieving fluorescent imaging and phototherapy combination. The theranostic nanoparticle is prepared by a simple one-step dialysis method of reduction active amphiphilic hyperbranched poly(-amidoamines) and a near-infrared (NIR) dye indocyanine green (ICG). Read More

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December 2021

Optimization of biochar quality and yield from tropical timber industry wastes.

Waste Manag 2021 Jul 3;131:341-349. Epub 2021 Jul 3.

University of Padova, Department of Industrial Engineering, Via Marzolo 9, 35131 Padova, Italy. Electronic address:

The conversion of timber industry waste to biochar was investigated, based on residues from local tropical hardwoods in Cameroon. Closed and flow reactors, loaded with few grams of the sample and fluxed with different inert gases, were used with the aim of converting these wood residues to a safe and efficient solid fuel that can be exploited by the local community for cooking purposes. The pyrolysis temperature had the highest impact on the process up to approximately 700 °C as biochar yields decreased from 87 to 23. Read More

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In Vitro Model Systems for Exploring Oral Biofilms: From Single-Species Populations to Complex Multi-Species Communities.

J Appl Microbiol 2021 Jul 3. Epub 2021 Jul 3.

Department of Epidemiology, University of Michigan, School of Public Health, Ann Arbor, MI, USA.

Numerous in vitro biofilm model systems are available to study oral biofilms. Over the past several decades, increased understanding of oral biology and advances in technology have facilitated more accurate simulation of intraoral conditions and have allowed for the increased generalizability of in vitro oral biofilm studies. The integration of contemporary systems with confocal microscopy and 16S rRNA community profiling have enhanced the capabilities of in vitro biofilm model systems to quantify biofilm architecture and analyze microbial community composition. Read More

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[Effect of Rate of Salinity Increase on the Performance and Microbial Community Structure of Sequencing Batch Reactors].

Huan Jing Ke Xue 2021 Jul;42(7):3413-3421

College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.

In this study, three sequence batch reactors were selected to evaluate the effects of salt-tolerant activated sludge acclimation. The effect of salinity increase rate on pollutant removal, physicochemical characteristics of activated sludge, and microbial community were investigated. The results showed that a rapid salinity increase to 30‰ (within 30 d) reduced removal efficiencies of COD and NH-N from 85. Read More

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[First Extended Anaerobic Phase Enhanced Nitrogen and Phosphorus Removal by Aerobic Granular Sludge Under Intermittent Gradient Aeration].

Huan Jing Ke Xue 2021 Jul;42(7):3405-3412

Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.

In this study, a SBR reactor was selected to explore the effect of nitrogen and phosphorus removal by aerobic granular sludge under different initial anaerobic time using intermittent gradient aeration (decreasing dissolved oxygen concentration in each aeration section) and actual domestic wastewater with low C/N ratio as the influent matrix. The results showed that the initial anaerobic stage of intermittent gradient aeration increased from 50 min to 90 min, which increased the carbon source reserves in granular sludge. This improved delayed anaerobic condition led to the improvement of nitrogen and phosphorus removal efficiency of granular sludge. Read More

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[Two-Stage Denitrification Process Performance with Solid Slow-Release Carbon Source].

Huan Jing Ke Xue 2021 Jul;42(7):3392-3399

School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.

During wastewater treatment using a traditional biological denitrification process, the excessive concentration of nitrate nitrogen (NO-N) in the effluent is the primary cause of excessive total nitrogen (TN) generation. By using an external carbon source to increase the carbon to nitrogen ratio (C/N), the denitrification process can be strengthened, which effectively addresses this problem. Using an integrated denitrification reactor developed based on the two-stage denitrification process principle with the addition of polybutylene succinate (PBS) in the second stage, the denitrification process was analyzed using a scanning electron microscope before and after characterization of PBS materials. Read More

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Supplemental nutrients stimulate the amplification of carbapenemase-producing (CPKP) in a sink drain biofilm reactor model.

Biofouling 2021 Jul 1:1-16. Epub 2021 Jul 1.

Division of Healthcare Quality Promotion, Clinical and Environmental Microbiology Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA.

Liquid wastes (LW) disposed in hospital handwashing sinks may affect colonization of sink P-traps by carbapenemase-producing (CPKP), causing CPKP dispersal into the patient care environment. This study aimed to determine the effect of LW on biofilm formation and CPKP colonization in a P-Trap model (PTM). PTMs containing polymicrobial biofilms grown in autoclaved municipal tap water (ATW) supplemented with 5% dextrose in water (D5W), nutritional shake (Shake), sugar-based soft drink (Soda), or ATW were inoculated with ST258 KPC+ (ST258) or CAV1016 (CAV1016) and sampled after 7, 14, and 21 d. Read More

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