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Quality enhancement and microbial reduction of mung bean(Vigna radiata)sprouts by non-thermal plasma pretreatment of seeds

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Plasma Science and Technology 2022年第4期24卷 164-176页

作者： Dongjie CUI Xiaoxia HU Yue YIN Yupan ZHU Jie ZHUANG Xiaojie WANG Ruonan MA Zhen JIAO Henan Key Laboratory of Ion-Beam Bioengineering School of Agricultural SciencesZhengzhou UniversityZhengzhou 450052People's Republic of China Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of SciencesSuzhou 215163People's Republic of China School of Life Sciences and Basic Medicine Xinxiang UniversityXinxiang 453003People's Republic of China

Mung bean(Vigna radiata)sprouts are widely consumed worldwide due to their high nutritional ***,the low yield and microbial contamination of mung bean sprouts seriously reduces their economic *** study investigates the effects of non-thermal plasma on the quality and microbial reduction of mung bean sprouts by pretreatment of seeds in water for different times(0,1,3 and 6 min).The quality results showed that short-time plasma treatment(1 and 3 min)promoted seed germination and seedling growth,whereas long-time plasma treatment(6 min)had inhibitory *** also had a similar dose effects on the total flavonoid and phenolic contents of mung bean *** microbiological results showed that plasma treatment achieved a reduction of native microorganisms ranging from 0.54 to 7.09 log for fungi and 0.29 to 6.80 log for bacteria at 96 h ***,plasma treatment could also efficiently inactivate artificially inoculated Salmonella typhimurium(1.83–6.22 log)and yeast(0.53–3.19 log)on mung bean *** results of seed coat permeability tests and scanning electron microscopy showed that plasma could damage the seed coat structure,consequently increasing the electrical conductivity of mung bean *** physicochemical analysis of plasma-treated water showed that plasma generated various long-and short-lived active species[nitric oxide radicals(NO·),hydroxyl radicals(·OH),singlet oxygen(1O2),hydrogen peroxide(H_(2)O_(2)),nitrate(NO_(3)^(-)),and nitrite(NO_(2)^(-))]in water,thus the oxidizability,acidity and conductivity of plasma-treated water were all increased in a treatment timedependent *** result for mimicked chemical mixtures confirmed the synergistic effect of activity of H_(2)O_(2),NO_(3)^(-)and NO_(2)^(-)on bacterial inactivation and plant growth *** together,these results imply that plasma pretreatment of mung bean seeds in water with moderate oxidizability and acidity is an effective method to improve the y

关键词： non-thermal plasma mung bean sprout quality microbial reduction reactive oxygen and nitrogen species

Process control factors for continuous microbial perchlorate reduction in the presence of zero-valent iron

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Frontiers of Environmental Science & Engineering 2014年第3期8卷 386-393页

作者： Robert D. ARTHUR Jagadish TORLAPATI Kyung-Hee SHIN Daniel K. CHA Yeomin YOON Ahjeong SON Department of Civil Engineering Auburn University Auburn AL 36849 USA Korea Environment Institute Seoul 122-706 Republic of Korea Department of Civil and Environmental Engineering University of Delaware Newark DE 19716 USA Department of Civil and Environmental Engineering University of South Carolina Columbia SC 29208 USA Department of Environmental Science and Engineering Ewha Womans University Seoul 120-750 Korea

Process control parameters influencing microbial perchlorate reduction via a flow-through zero-valent iron （ZVI） column reactor were investigated in order to optimize perchlorate removal from water. Mixed perchlorate reducers were obtained from a wastewater treatment plant and inoculated into the reactor without further acclimation. Examined parameters included hydraulic residence time （HRT）, pH, nutrients requirement, and perchlorate reduction kinetics. The minimum HRT for the system was concluded to be 8 hr. The removal efficiency of 10 mg. L-1 influent perchlorate concentration was reduced by 20%-80% without control to the neutral pH （HRT = 8 hr）. Therefore pH was determined to be an important parameter for microbial perchlorate reduction. Furthermore, a viable alternative to pH buffer was discussed. The microbial perchlorate reduction followed the first order kinetics, with a rate constant （K） of 0.761 hr-1. The results from this study will contribute to the implementation of a safe, cost effective, and efficient system for perchlorate reduction to below regulated levels.

关键词： perchlorate zero-valent iron (ZVI) microbial reduction hydrogen

Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism

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Journal of Environmental Sciences 2022年第8期34卷 67-75页

作者： Jianfeng Zhang ShichangWei Zhenxing Liu Huang Tang Xiaoguang Meng Weihuang Zhu Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Center for Environmental Systems Stevens Institute of TechnologyNJ 07030USA

In this study, Pb(Ⅱ) was used as a target heavy metal pollutant, and the metabolism of Shewanella putrefaciens(S. putrefaciens) was applied to achieve reducing conditions to study the effect of microbial reduction on lead that was preadsorbed on graphene oxide(GO) *** results showed that GO was transformed to its reduced form(r-GO) by bacteria, and this process induced the release of Pb(Ⅱ) adsorbed on the GO surfaces. After 72 hr of exposure in an S. putrefaciens system, 5.76% of the total adsorbed Pb(Ⅱ) was stably dispersed in solution in the form of a Pb(Ⅱ)-extracellular polymer substance(EPS) complex, while another portion of Pb(Ⅱ) released from GO-Pb(Ⅱ) was observed as lead phosphate hydroxide(Pb_(10)(PO_(4))_(6)(OH)_(2))precipitates or adsorbed species on the surface of the cell. Additionally, increasing pH induced the stripping of oxidative debris(OD) and elevated the content of dispersible Pb(Ⅱ)in aqueous solution under the conditions of S. putrefaciens metabolism. These research results provide valuable information regarding the migration of heavy metals adsorbed on GO under reducing conditions due to microbial metabolism.

关键词： Graphene oxide Pb(Ⅱ) Shewanella putrefaciens Extracellular polymeric substances microbial reduction

Biochar regulates biogeochemical cycling of iron and chromium in a soil-rice system by stimulating Geobacter and Clostridium

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Pedosphere 2024年第5期34卷 929-940页

作者： Min XU Yang LIN Jing MA Lulu LONG Chao CHEN Gang YANG Chun SONG Jun WU Xiaohong ZHANG Peng GAO College of Environmental Science Sichuan Agricultural UniversityChengdu 611130China Soil Waterand Ecosystem Sciences DepartmentUniversity of FloridaGainesville FL 32611USA College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYaan 625014China Department of Environmental and Occupational Health University of Pittsburgh School of Public HealthPittsburgh PA 15261USA

In soil-rice systems,microbial reduction of iron(Fe)has been recognized as a crucial biogeochemical process that regulates Fe and chromium(Cr)translocation;however,the underlying processes are *** investigate the impacts of biochar on the biochemical cycling of Fe and Cr and their toxicity to rice,maize straw biochar was applied at 1%(weight/weight)to a paddy soil spiked with 300 mg kg^(-1)Cr under two phosphorus(P)levels(0 or 90 mg kg^(-1))in a pot *** key microbial groups affecting Fe dissimilatory reduction and their environmental drivers were *** inhibited root Cr uptake by 36%,owing to the promoted iron plaque(IP)formation on the rice root *** analysis showed that Fe concentration in pore water was strongly linked to the abundances of Geobacter(r=0.81-0.94,P<0.05)and Clostridium(r=0.83-0.95,P<0.05),indicating that Geobacter and Clostridium played essential roles in Fe *** analysis showed that labile carbon and pore water P concentrations were the key determinants influencing Fe-reducing bacterial abundances,accounting for 42%and 32%of the variation in community composition,***,biochar increased Fe and P concentrations in root cell walls,which retained more ***,Cr stress in rice under biochar treatment was relieved through increasing IP formation and altering subcellular *** mechanistic insights had important implications for reducing Cr uptake by rice.

关键词： chromium translocation iron plaque iron reduction maize straw biochar microbial reduction paddy soil phosphorus fertilization subcellular distribution

Dissimilatory reduction of Fe^III (EDTA) with microorganisms in the system of nitric oxide removal from the flue gas by metal chelate absorption

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Journal of Environmental Sciences 2004年第3期16卷 428-430页

作者： MABi-yao LIWei JINGGuo-hua SHIYao InstituteofEnvironmentalEngineering ZhejiangUniversityHangzhou310027China

In the system of nitric oxide removal from the flue gas by metal chelate absorption, it is an obstacle that ferrous absorbents are easily oxidized by oxygen in the flue gas to ferric counterparts, which are not capable of binding NO. By adding iron metal or electrochemical method, Fe III (EDTA) can be reduced to Fe II (EDTA). However, there are various drawbacks associated with these techniques. The dissimilatory reduction of Fe III (EDTA) with microorganisms in the system of nitric oxide removal by metal chelate absorption was investigated. Ammonium salt instead of nitrate was used as the nitrogen source, as nitrates inhibited the reduction of Fe III due to the competition between the two electron acceptors. Supplemental glucose and lactate stimulated the formation of Fe II more than ethanol as the carbon sources. The microorganisms cultured at 50℃ were not very sensitive to the other experimental temperature, the reduction percentage of Fe III varied little with the temperature range of 30—50℃. Concentrated Na 2CO 3 solution was added to adjust the solution pH to an optimal pH range of 6—7 The overall results revealed that the dissimilatory ferric reducing microorganisms present in the mix culture are probably neutrophilic, moderately thermophilic Fe III reducers.

关键词： dissimilatory ferric reducing microorganisms Fe III (EDTA) microbial reduction mix culture

Effects of Cd on reductive transformation of lepidocrocite by Shewanella oneidensis MR-1

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Acta Geochimica 2017年第3期36卷 479-481页

作者： Chaolei Yuan Fangbai Li Rui Han Tongxu Liu Weimin Sun Weilin Huang Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Guangdong Institute of Eco-environmental Science and Technology Guangzhou 510650 China Department of Environmental Sciences Rutgers UniversityNew Brunswick NJ 08901 USA

We investigated the reduction of lepidocrocite(γ-FeOOH) by Shewanella oneidensis MR-1 in the presence and absence of Cd. The results showed that Cd^(2+) retarded microbial reduction of γ-Fe OOH and avoided formation of magnetite. The inhibitory effect on γ-Fe OOH transformation may not result from Cd^(2+) toxicity to the bacterium; it rather was probably due to competitive adsorption between Cd^(2+) and Fe^(2+) on γ-Fe OOH as its surface reduction catalyzed by adsorbed Fe^(2+) was eliminated by adsorption of Cd^(2+).

关键词： Lepidocrocite Cadmium microbial reduction