Subjects -> BUSINESS AND ECONOMICS (Total: 3570 journals)
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    - BUSINESS AND ECONOMICS (1248 journals)
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    - TRADE AND INDUSTRIAL DIRECTORIES (2 journals)

BUSINESS AND ECONOMICS (1248 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1566 Journals sorted alphabetically
360 : Revista de Ciencias de la Gestión     Open Access   (Followers: 2)
4OR: A Quarterly Journal of Operations Research     Hybrid Journal   (Followers: 13)
Abacus     Hybrid Journal   (Followers: 16)
Accounting Forum     Hybrid Journal   (Followers: 22)
Acta Commercii     Open Access   (Followers: 3)
Acta Marisiensis : Seria Oeconomica     Open Access  
Acta Oeconomica     Full-text available via subscription   (Followers: 3)
Acta Scientiarum. Human and Social Sciences     Open Access   (Followers: 6)
Acta Universitatis Danubius. Œconomica     Open Access   (Followers: 1)
Acta Universitatis Lodziensis : Folia Geographica Socio-Oeconomica     Open Access   (Followers: 1)
Acta Universitatis Nicolai Copernici Zarządzanie     Open Access   (Followers: 4)
AD-minister     Open Access   (Followers: 3)
Adam Academy : Journal of Social Sciences / Adam Akademi : Sosyal Bilimler Dergisi     Open Access   (Followers: 3)
AdBispreneur : Jurnal Pemikiran dan Penelitian Administrasi Bisnis dan Kewirausahaan     Open Access   (Followers: 1)
Admisi dan Bisnis     Open Access   (Followers: 1)
Advanced Sustainable Systems     Hybrid Journal   (Followers: 7)
Advances in Developing Human Resources     Hybrid Journal   (Followers: 26)
Advances in Economics and Business     Open Access   (Followers: 21)
Africa Journal of Management     Hybrid Journal   (Followers: 2)
AfricaGrowth Agenda     Full-text available via subscription   (Followers: 3)
African Affairs     Hybrid Journal   (Followers: 68)
African Business     Full-text available via subscription   (Followers: 3)
African Development Review     Hybrid Journal   (Followers: 45)
African Journal of Business and Economic Research     Full-text available via subscription   (Followers: 6)
African Journal of Business Ethics     Open Access   (Followers: 7)
African Review of Economics and Finance     Open Access   (Followers: 7)
Afro Eurasian Studies     Open Access   (Followers: 1)
Afro-Asian Journal of Finance and Accounting     Hybrid Journal   (Followers: 5)
Afyon Kocatepe Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi     Open Access   (Followers: 3)
Agronomy     Open Access   (Followers: 12)
Akademik Yaklaşımlar Dergisi     Open Access   (Followers: 1)
AL-Qadisiyah Journal For Administrative and Economic sciences     Open Access   (Followers: 2)
Alphanumeric Journal : The Journal of Operations Research, Statistics, Econometrics and Management Information Systems     Open Access   (Followers: 9)
American Economic Journal : Applied Economics     Full-text available via subscription   (Followers: 215)
American Enterprise Institute     Free   (Followers: 3)
American Journal of Business     Hybrid Journal   (Followers: 20)
American Journal of Business and Management     Open Access   (Followers: 51)
American Journal of Business Education     Open Access   (Followers: 14)
American Journal of Economics and Business Administration     Open Access   (Followers: 34)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 36)
American Journal of Evaluation     Hybrid Journal   (Followers: 16)
American Journal of Finance and Accounting     Hybrid Journal   (Followers: 22)
American Journal of Health Economics     Full-text available via subscription   (Followers: 19)
American Journal of Industrial and Business Management     Open Access   (Followers: 24)
American Journal of Medical Quality     Hybrid Journal   (Followers: 15)
American Law and Economics Review     Hybrid Journal   (Followers: 32)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Ankara University SBF Journal     Open Access   (Followers: 1)
Annals in Social Responsibility     Full-text available via subscription  
Annals of Finance     Hybrid Journal   (Followers: 33)
Annals of Operations Research     Hybrid Journal   (Followers: 14)
Annual Review of Economics     Full-text available via subscription   (Followers: 44)
Anuario Facultad de Ciencias Económicas y Empresariales     Open Access   (Followers: 1)
Applied Developmental Science     Hybrid Journal   (Followers: 4)
Applied Economics     Hybrid Journal   (Followers: 58)
Applied Economics Letters     Hybrid Journal   (Followers: 31)
Applied Economics Quarterly     Full-text available via subscription   (Followers: 12)
Applied Financial Economics     Hybrid Journal   (Followers: 26)
Applied Mathematical Finance     Hybrid Journal   (Followers: 7)
Applied Stochastic Models in Business and Industry     Hybrid Journal   (Followers: 4)
Apuntes Universitarios     Open Access   (Followers: 1)
Arab Economic and Business Journal     Open Access   (Followers: 3)
Archives of Business Research     Open Access   (Followers: 5)
Arena Journal     Full-text available via subscription   (Followers: 1)
Argomenti. Rivista di economia, cultura e ricerca sociale     Open Access   (Followers: 4)
ASEAN Economic Bulletin     Full-text available via subscription   (Followers: 7)
Asia Pacific Business Review     Hybrid Journal   (Followers: 9)
Asia Pacific Journal of Human Resources     Hybrid Journal   (Followers: 207)
Asia Pacific Journal of Innovation and Entrepreneurship     Open Access   (Followers: 3)
Asia Pacific Viewpoint     Hybrid Journal   (Followers: 4)
Asia-Pacific Journal of Business Administration     Hybrid Journal   (Followers: 6)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asia-Pacific Journal of Rural Development     Hybrid Journal   (Followers: 2)
Asia-Pacific Management and Business Application     Open Access   (Followers: 1)
Asian Case Research Journal     Hybrid Journal   (Followers: 1)
Asian Development Review     Open Access   (Followers: 13)
Asian Economic Journal     Hybrid Journal   (Followers: 10)
Asian Economic Papers     Hybrid Journal   (Followers: 8)
Asian Economic Policy Review     Hybrid Journal   (Followers: 5)
Asian Journal of Business Ethics     Hybrid Journal   (Followers: 9)
Asian Journal of Economics, Business and Accounting     Open Access  
Asian Journal of Social Sciences and Management Studies     Open Access   (Followers: 6)
Asian Journal of Sustainability and Social Responsibility     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Asian-pacific Economic Literature     Hybrid Journal   (Followers: 8)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 3)
Atlantic Economic Journal     Hybrid Journal   (Followers: 11)
Australasian Journal of Regional Studies, The     Full-text available via subscription   (Followers: 1)
Australian Cottongrower, The     Full-text available via subscription  
Australian Economic Papers     Hybrid Journal   (Followers: 10)
Australian Economic Review     Hybrid Journal   (Followers: 4)
Australian Journal of Maritime and Ocean Affairs     Hybrid Journal   (Followers: 7)
Baltic Journal of Real Estate Economics and Construction Management     Open Access   (Followers: 5)
Banks in Insurance Report     Hybrid Journal   (Followers: 1)
BBR - Brazilian Business Review     Open Access   (Followers: 3)
Benchmarking : An International Journal     Hybrid Journal   (Followers: 7)
Benefit : Jurnal Manajemen dan Bisnis     Open Access  
Berkeley Business Law Journal     Free   (Followers: 11)
Beta : Scandinavian Journal of Business Research     Full-text available via subscription  
Bio-based and Applied Economics     Open Access   (Followers: 1)
Biodegradation     Hybrid Journal   (Followers: 2)
Biology Direct     Open Access   (Followers: 9)
BizInfo (Blace) Journal of Economics, Management and Informatics     Open Access   (Followers: 1)
Black Enterprise     Full-text available via subscription  
Board & Administrator for Administrators only     Hybrid Journal  
Boletim Técnico do Senac     Open Access  
Border Crossing : Transnational Working Papers     Open Access   (Followers: 2)
Brazilian Business Review     Open Access  
Briefings in Real Estate Finance     Hybrid Journal   (Followers: 7)
British Journal of Industrial Relations     Hybrid Journal   (Followers: 48)
Brookings Papers on Economic Activity     Open Access   (Followers: 68)
Brookings Trade Forum     Full-text available via subscription   (Followers: 4)
BRQ Business Research Quarterly     Open Access   (Followers: 2)
BU Academic Review     Open Access  
Bulletin of Economic Research     Hybrid Journal   (Followers: 19)
Bulletin of Geography. Socio-economic Series     Open Access   (Followers: 3)
Bulletin of Indonesian Economic Studies     Hybrid Journal   (Followers: 5)
Bulletin of the Dnipropetrovsk University. Series : Management of Innovations     Open Access   (Followers: 1)
Business & Entrepreneurship Journal     Open Access   (Followers: 24)
Business & Information Systems Engineering     Hybrid Journal   (Followers: 5)
Business & Society     Hybrid Journal   (Followers: 14)
Business : Theory and Practice / Verslas : Teorija ir Praktika     Open Access   (Followers: 1)
Business and Economic Research     Open Access   (Followers: 8)
Business and Management Horizons     Open Access   (Followers: 9)
Business and Management Research     Open Access   (Followers: 17)
Business and Management Studies     Open Access   (Followers: 11)
Business and Professional Communication Quarterly     Hybrid Journal   (Followers: 8)
Business and Society Review     Hybrid Journal   (Followers: 5)
Business Economics     Hybrid Journal   (Followers: 14)
Business Ethics Quarterly     Full-text available via subscription   (Followers: 18)
Business Ethics: A European Review     Hybrid Journal   (Followers: 20)
Business Horizons     Hybrid Journal   (Followers: 11)
Business Information Review     Hybrid Journal   (Followers: 15)
Business Management Analysis Journal     Open Access   (Followers: 3)
Business Management and Strategy     Open Access   (Followers: 38)
Business Research     Open Access   (Followers: 2)
Business Review Journal     Open Access   (Followers: 1)
Business Strategy and Development     Hybrid Journal  
Business Strategy and the Environment     Hybrid Journal   (Followers: 11)
Business Strategy Review     Hybrid Journal   (Followers: 12)
Business Strategy Series     Hybrid Journal   (Followers: 6)
Business, Economics and Management Research Journal : BEMAREJ     Open Access   (Followers: 4)
Business: Theory and Practice     Open Access   (Followers: 1)
Cambridge Journal of Economics     Hybrid Journal   (Followers: 77)
Cambridge Journal of Regions, Economy and Society     Hybrid Journal   (Followers: 11)
Canadian Journal of Administrative Sciences / Revue Canadienne des Sciences de l Administration     Hybrid Journal   (Followers: 1)
Canadian Journal of Economics/Revue Canadienne d`Economique     Hybrid Journal   (Followers: 43)
Canadian journal of nonprofit and social economy research     Open Access   (Followers: 3)
Capitalism Nature Socialism     Hybrid Journal   (Followers: 21)
Case Studies in Business and Management     Open Access   (Followers: 12)
Central European Business Review     Open Access   (Followers: 2)
Central European Journal of Operations Research     Hybrid Journal   (Followers: 5)
Central European Journal of Public Policy     Open Access   (Followers: 3)
CESifo Economic Studies     Hybrid Journal   (Followers: 23)
Chain Reaction     Full-text available via subscription  
Challenge     Full-text available via subscription   (Followers: 6)
Chandrakasem Rajabhat University Journal of Graduate School     Open Access  
China & World Economy     Hybrid Journal   (Followers: 13)
China : An International Journal     Full-text available via subscription   (Followers: 20)
China Economic Journal : The Official Journal of the China Center for Economic Research (CCER) at Peking University     Hybrid Journal   (Followers: 14)
China Economic Review     Hybrid Journal   (Followers: 14)
China Finance Review International     Hybrid Journal   (Followers: 4)
China perspectives     Open Access   (Followers: 12)
Chinese Economy     Full-text available via subscription   (Followers: 3)
Chinese Journal of Population, Resources and Environment     Open Access  
Chinese Journal of Social Science and Management     Open Access  
Christian University of Thailand Journal     Open Access  
Chulalongkorn Business Review     Open Access  
Ciencia, Economía y Negocios     Open Access  
Circular Economy and Sustainability     Hybrid Journal   (Followers: 1)
Cleaner and Responsible Consumption     Open Access  
Cleaner Logistics and Supply Chain     Open Access   (Followers: 1)
Climate and Energy     Full-text available via subscription   (Followers: 6)
CLIO América     Open Access   (Followers: 2)
Cliometrica     Hybrid Journal   (Followers: 4)
Colombo Business Journal     Open Access  
Community Development Journal     Hybrid Journal   (Followers: 24)
Compendium : Cuadernos de Economía y Administración     Open Access  
Compensation & Benefits Review     Hybrid Journal   (Followers: 6)
Competition & Change     Hybrid Journal   (Followers: 12)
Competitive Intelligence Review     Hybrid Journal   (Followers: 4)
Competitiveness Review : An International Business Journal incorporating Journal of Global Competitiveness     Hybrid Journal  
Computational Economics     Hybrid Journal   (Followers: 12)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computer Law & Security Review     Hybrid Journal   (Followers: 23)
Computers & Operations Research     Hybrid Journal   (Followers: 14)
Consilience : The Journal of Sustainable Development     Open Access   (Followers: 2)
Construction Innovation: Information, Process, Management     Hybrid Journal   (Followers: 14)
Consumer Behavior Studies Journal     Open Access   (Followers: 2)
Consumer Psychology Review     Hybrid Journal   (Followers: 3)
Contemporary Wales     Full-text available via subscription   (Followers: 1)
Contextus - Revista Contemporânea de Economia e Gestão     Open Access   (Followers: 1)
Continuity & Resilience Review     Hybrid Journal   (Followers: 1)
Contributions to Political Economy     Hybrid Journal   (Followers: 9)
Corporate Communications An International Journal     Hybrid Journal   (Followers: 5)
Corporate Philanthropy Report     Hybrid Journal   (Followers: 2)
Corporate Reputation Review     Hybrid Journal   (Followers: 4)
Creative and Knowledge Society     Open Access   (Followers: 9)
Creative Industries Journal     Hybrid Journal   (Followers: 8)
Cuadernos de Administración (Universidad del Valle)     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Similar Journals
Journal Cover
Biodegradation
Journal Prestige (SJR): 0.876
Citation Impact (citeScore): 2
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-9729 - ISSN (Online) 0923-9820
Published by Springer-Verlag Homepage  [2469 journals]
  • Optimizing the malathion degrading potential of a newly isolated Bacillus
           sp. AGM5 based on Taguchi design of experiment and elucidation of
           degradation pathway

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      Abstract: Malathion, a pesticide used to control pests in crops, vegetables, fruits, and livestock. Its widespread and indiscriminate usage has ensued in different ecological issues, thus, it’s vital to remediate this insecticide. Malathion degrading bacterium Bacillus sp. AGM5, isolated from pesticide contaminated agricultural field was cultured in presence of different malathion concentrations under aerobic and energy restrictive conditions and was found effective at malathion degradation. Recovered malathion was extracted based on QuEChERS approach and then analyzed by UHPLC. About 39.5% of malathion biodegradation was observed at 300 µlL−1 after 96 h of incubation with the tested bacteria which increased to 58.5% and 72.5% after 240, and 360 h of incubation, respectively. To further enhance malathion biodegradation, the effects of co-substrates, pH, temperature, initial malathion concentration, agitation (rpm), and inoculum size were evaluated using Taguchi methodology. Taguchi DOE’s ability to predict the optimal response was established experimentally via optimised levels of these factors (glucose-0.1%, yeast extract-0.1%, inoculum size-2% wv−1, malathion concentration 300 µlL−1, rpm-150, pH-7, temperature 40 °C), whereby biodegradation rate was enhanced to 95.49% after 38 h. Confirmation of malathion biodegradation was performed by UHPLC, Q-TOF–MS, GC–MS analysis and a possible degradation pathway was proposed for malathion biodegradation. First order kinetic model was appropriate to describe malathion biodegradation. The Taguchi DOE proved to be viable tool for optimizing culture conditions and analysing the interactions between process parameters in order to attain the best feasible combination for maximum malathion degradation. These results could influence the development of a bioremediation strategy. Graphical abstract
      PubDate: 2022-05-16
       
  • Single-well push–pull tests evaluating isobutane as a primary substrate
           for promoting in situ cometabolic biotransformation reactions

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      Abstract: Abstract A series of single-well push–pull tests (SWPPTs) were performed to investigate the efficacy of isobutane (2-methylpropane) as a primary substrate for in situ stimulation of microorganisms able to cometabolically transform common groundwater contaminants, such as chlorinated aliphatic hydrocarbons and 1,4-dioxane (1,4-D). In biostimulation tests, the disappearance of isobutane relative to a nonreactive bromide tracer indicated an isobutane-utilizing microbial community rapidly developed in the aquifer around the test well. SWPPTs were performed as natural drift tests with first-order rates of isobutane consumption ranging from 0.4 to 1.4 day−1. Because groundwater contaminants were not present at the demonstration site, isobutene (2-methylpropene) was used as a nontoxic surrogate to demonstrate cometabolic activity in the subsurface after biostimulation. The transformation of isobutene to isobutene epoxide (2-methyl-1,2-epoxypropane) illustrates the epoxidation process previously shown for common groundwater contaminants after cometabolic transformation by alkane-utilizing bacteria. The rate and extent of isobutene consumption and the formation and transformation of isobutene epoxide were greater in the presence of isobutane, with no evidence of primary substrate inhibition. Modeled concentrations of isobutane-utilizing biomass in microcosms constructed with groundwater collected before and after each SWPPT offered additional evidence that the isobutane-utilizing microbial community was stimulated in the aquifer. Experiments in groundwater microcosms also demonstrated that the isobutane-utilizing bacteria stimulated in the subsurface could cometabolically transform a mixture of co-substrates including isobutene, 1,1-dichloroethene, cis-1,2-dichloroethene, and 1,4-D with the same co-substrate preferences as the bacterium Rhodococcus rhodochrous ATCC strain 21198 after growth on isobutane. This study demonstrated the effectiveness of isobutane as primary substrate for stimulating in situ cometabolic activity and the use of isobutene as surrogate to investigate in situ cometabolic reactions catalyzed by isobutane-stimulated bacteria.
      PubDate: 2022-05-12
       
  • Vinasse odyssey: sugarcane vinasse remediation and laccase production by
           Trametes sp. immobilized in polyurethane foam

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      Abstract: Vinasse is a high pollutant liquid residue from bioethanol production. Due to its toxicity, most vinasse is used not disposed of in water bodies but employed for the fertigation of sugarcane crops, potentially leading to soil salinization or heavy metal deposition. The anaerobic digestion of vinasse for energy production is the main alternative to fertigation, but the process cannot eliminate colored compounds such as melanoidins, caramels, or phenolic compounds. The treatment of raw vinasse with white-rot fungi could remove colored and persistent toxic compounds, but is generally considered cost-ineffective. We report the treatment of vinasse by an autochthonous Trametes sp. strain immobilized in polyurethane foam and the concomitant production of high titers of laccase, a high value-added product that could improve the viability of the process. The reuse of the immobilized biomass and the discoloration of raw vinasse, the concentration of phenolic compounds, BOD and COD, and the phytotoxicity of the treated vinasse were measured to assess the viability of the process and the potential use of treated vinasse in fertigation or as a complementary treatment to anaerobic digestion. Under optimal conditions (vinasse 0.25X, 30 °C, 21 days incubation, 2% glucose added in the implantation stage), immobilized Trametes sp. causes a decrease of 75% in vinasse color and total phenolic compounds, reaching 1082 U L−1 of laccase. The fungi could be used to treat 0.50X vinasse (BOD 44,400 mg O2 L−1), causing a 26% decolorization and a 30% removal of phenolic compounds after 21 days of treatment with maximum laccase titers of 112 U L−1, while reducing COD and BOD from 103,290 to 42,500 mg O2 L−1 (59%) and from 44,440 to 21,230 mg O2 L−1 (52%), respectively. The re-utilization of immobilized biomass to treat 0.50X vinasse proved to be successful, leading to the production of 361 U L−1 of laccase with 77% decolorization, 61% degradation of phenolic compounds, and the reduction of COD and BOD by 75% and 80%, respectively. Trametes sp. also reduced vinasse phytotoxicity to Lactuca sativa seedlings. The obtained results show that the aerobic treatment of vinasse by immobilized Trametes sp. is an interesting technology that could be employed as a sole treatment for the bioremediation of vinasse, with the concomitant the production of laccase. Alternatively, the methodology could be used in combination with anaerobic digestion to achieve greater decolorization and reduction of phenolic compounds, melanoidins, and organic load. Graphical abstract
      PubDate: 2022-05-07
       
  • The intrinsic relevance of nitrogen removal pathway to varying nitrate
           loading rate in a polycaprolactone-supported denitrification system

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      Abstract: Abstract Up to date, the intrinsic association of nitrate loading rate (NLR) with treatment performance of solid-phase denitrification (SPD) systems is still ambiguous. To address this issue, three continuous up-flow bioreactors were configured. They were packed with polycaprolactone (PCL) under a filling ratio of 30%, 60% or 90% and were operated under a varying NLR of 0.34 ± 0.01–3.99 ± 0.12 gN/(L·d). Results showed that the denitrification efficiency was high (RE > 96%) and stable except the case with the highest NLR, which was mainly attributed to the lack of available carbon sources. At the phylum or genus level, most of the detected dominant bacterial taxa were either associated with organics degradation or nitrogen metabolism. The difference in bacterial community structure among the three stages was mainly caused by NLR rather than the filling ratio. Moreover, as the NLR got higher, the Bray–Curtis distance between samples from the same stage became shorter. By the results of gene or enzyme prediction performed in PICRUSt2, the main nitrogen metabolism pathways in these reactors were denitrification, dissimilatory nitrate reduction to ammonium (DNRA), assimilatory nitrate reduction to ammonium (ANRA) and nitrogen fixation. Moreover, aerobic and anaerobic nitrate dissimilation coexisted in the systems with the latter playing a dominant role. Finally, denitrification and DNRA occurred under both high and low NLR conditions while nitrogen fixation and ANRA preferred to occur under low NLR environments. These findings might help guide practical applications.
      PubDate: 2022-05-06
       
  • Degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) and
           2,4,5-trichlorophenoxyacetic acid (2,4,5-T) by fungi originating from
           Vietnam

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      Abstract: Three different fungi were tested for their ability to degrade 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid and for the role of laccases and cytochromes P450-type in this process. We studied a white-rot fungus Rigidoporus sp. FMD21, which has a high laccase activity, for its efficiency to degrade these herbicides. A positive correlation was found between its laccase activity and the corresponding herbicide degradation rate. Even more, the doubling of the enzyme activity in this phase corresponded with a doubling of the herbicide degradation rate. It is, therefore, tempting to speculate that laccase is the most dominant enzyme in the degradation of 2,4-D and 2,4,5-T under these conditions. In addition, it was shown that Rigidoporus sp. FMD21 partly relies on cytochromes P450-type for the breakdown of the herbicides as well. Two filamentous fungi were isolated from soil contaminated with herbicides and dioxins located at Bien Hoa airbase. They belong to genera Fusarium and Verticillium of the phylum Ascomycota as judged by their 18S rRNA gene sequences. Both isolated fungi were able to degrade the herbicides but with different rates. Their laccase activity, however, was very low and did not correlate with the rate of breakdown of the herbicides. These data indicate that the white-rot fungus most likely synthesizes laccase and cytochromes P450-type for the breakdown of the herbicides, while the types of enzyme used for the breakdown of the herbicides by the two Ascomycota remain unclear. Graphical abstract
      PubDate: 2022-05-02
       
  • Tylosin in anaerobic reactors: degradation kinetics, effects on methane
           production and on the microbial community

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      Abstract: Abstract Tylosin eliminated in animal waste, during therapeutic treatment, can be efficiently removed in anaerobic systems. The present study investigated the influence of tylosin concentration and assessed its degradation kinetics and the microorganisms involved in each stage of its anaerobic digestion (hydrolysis/acidogenesis; acetogenesis; methanogenesis). The results showed a stimulating effect on methane production with increasing tylosin concentration in the poultry litter up to 80 mg kg−1 tylosin (232.9 NL CH4 kg SV−1). As for tylosin degradation, greater removal of antibiotics was observed in the methanogenic phase (88%), followed by acetogenic (84%) and hydrolytic/acidogenic (76%) phases. The higher rate of tylosin degradation obtained in the methanogenic step, is mainly related to the co-metabolic effect exerted by the presence of acetate and its degradation by acetoclastic methanogens. Indeed, metagenomic analyses suggested a syntrophic action between archaea of ​​the genus Methanobacterium, and bacteria such as Clostridium and Flexilinea, which seemed decisive for tylosin degradation.
      PubDate: 2022-04-28
       
  • Investigating the biological degradation of the drug β-blocker atenolol
           from wastewater using the SBR

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      Abstract: Abstract Drug compounds are one of the main contributors to the entry of micro-pollutants into the environment, known as a constant threat to environmental stability. Atenolol is a type of beta-blocker extensively used to cure cardiovascular disorders. The residues of this compound have been continuously detected in aquatic environments because it is a polar and poorly biodegradable compound. Thus, removing atenolol from wastewater is essential before discharging into the environment. Biological processes are considered the most important removal process for polar drugs in wastewater treatment plants. Accordingly, for the first time in this study, the SBR performance was investigated in the biodegradation and mineralization of atenolol under different concentrations (50–600 mg/L) and hydraulic retention times (48–32 h). Based on the results, the time required for the acclimation of biomass to atenolol (C: 50 mg/L and the HRT: 48 h) was 80 days. The SBR efficiencies under optimum conditions (C: 400 mg/L and HRT: 40 h) in removing the atenolol and COD were 91% and 87%, respectively. For the first time in this study, one of the main pathways of the atenolol biodegradation was identified. Based on the review and comparison of the results of this study with existing literature showing that the SBR used in this study was able to remove higher concentrations with better efficiencies than other processes. Therefore, it can be concluded that the SBR used in this study could be considered an efficient and promising technique for treating wastewaters containing atenolol and other beta-blocker group drugs.
      PubDate: 2022-04-28
       
  • Enhanced anaerobic treatment of synthetic protein-rich wastewater promoted
           by organic xerogels

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      Abstract: Abstract Carbon-based materials have been shown to enhance anaerobic digestion processes by promoting direct interspecies electron transfer in methanogenic consortia. However, little is known on their effects during the treatment of complex substrates, such as those derived from protein-rich wastewaters. Here, organic xerogels (OX) are tested, for the first time, as accelerators of the methanogenic activity of an anaerobic consortium treating a synthetic protein-rich wastewater. Three OX with distinct pore size distribution (10 and 1000 nm for OX-10 and OX-1000, respectively) and structural conformation (graphene oxide integration into OX-10-GO polymeric matrix) were synthesized. OX-1000 promoted the highest methane production rate (5.21 mL/g*h, 13.5% increase with respect to the control incubated without OX) among the synthesized OX. Additionally, batch bioreactors amended with OX achieved higher chemical oxygen demand (COD) removal (up to 88%) as compared to the control, which only showed 50% of COD removal. Interestingly, amendment of bioreactors with OX also triggered the production of medium-chain fatty acids, including caprylate and caproate. Moreover, OX decreased the accumulation of ammonium, derived from proteins hydrolysis, partly explained by their adsorption capacities, and probably involving their electron-accepting capacity promoting anaerobic ammonium oxidation. This is the first time that OX were successfully applied as methanogenic accelerators for the anaerobic treatment of synthetic protein-rich wastewater, increasing the methane production rate and COD removal as well as triggering the production of medium chain fatty acids and attenuating the accumulation of ammonium. Therefore, OX are proposed as suitable materials to boost the efficiency of anaerobic systems to treat complex industrial wastewaters.
      PubDate: 2022-04-27
       
  • Up-flow anaerobic column reactor for sulfate-rich cadmium-bearing
           wastewater purification: system performance, removal mechanism and
           microbial community structure

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      Abstract: Abstract This study constructed an up-flow anaerobic column reactor fed with synthetic sulfate-rich cadmium (Cd(II))-bearing wastewater, for investigating its Cd(II) removal performance and mechanism. Long-term experiment results manifest that introducing Cd(II) into influent led to an enhanced sulfate removal but did not increase the effluent sulfide concentration, implying the CdS formation. When influent Cd(II) concentration was shifted from 50 to 100 mg/L, the median Cd(II) removal rate was increased from 13.6 to 32.2 mg/(L·d). Batch tests indicate that the uptake and sequestration function of anaerobes merely led to a small portion of Cd(II) removal. A majority of aqueous Cd(II) (86.3%) was eliminated by precipitation reactions. The generated precipitates were found to be dominantly presented in carbonate, Fe–Mn oxide, sulfide bound and residue forms, which account for 92.6–93.9% of total Cd content of sludge obtained at diverse operation phases. The crystallographic CdS (i.e., residue fraction) particles have nano-scale sizes, and the relatively high atomic ratio of S to Cd was likely due to the adsorption/deposition of other sulfides. The dominant sulfate-reducing bacteria (SRB) were recognized as Desulfurella, Desulforhabdus and Desulfovibrio, and the primary competitor with them for substrate utilization were identified to be methanogens.
      PubDate: 2022-04-24
       
  • Immobilization of psychrophile Psychrobacter sp. ANT206 onto novel
           reusable magnetic nanoparticles and its application for nitro-aromatic
           compounds biodegradation under low temperature

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      Abstract: Abstract Efficient biodegradation may offer a solution for the treatment of nitro-aromatic compounds (NACs) with toxicity, mutagenicity and persistence in the environment. In this study, dopamine (DA) functionalized magnetic nanoparticles with biocompatibility and hydrophilicity were synthesized and utilized for the immobilization of nitro-aromatic compounds degrading psychrophile Psychrobacter sp. ANT206 harboring the cold-adapted nitroreductase. The prepared nanocarriers were characterized using multiple methods. The highest immobilization yield of cells immobilized by Fe3O4@SiO2@DA was 90.67% under the optimized conditions of 10 °C, pH 7.5, 2 h and cell/support 1.2 mg/mg, and the activity recovery was 89.41%. In addition, the obtained immobilized cells displayed excellent salinity stability and reusability. Moreover, immobilized P. sp. ANT206 strains showed remarkable biodegradation capability on nitrobenzene and p-nitrophenol. This study introduced those novel Fe3O4@SiO2@DA nanoparticles could be applied as ideal and low-cost nanocarriers for the immobilization of cells and large-scale bioremediation of hazardous NACs with perspective applications under low temperature.
      PubDate: 2022-04-13
       
  • Kinetic isotope effects of C and N indicate different transformation
           mechanisms between atzA- and trzN-harboring strains in dechlorination of
           atrazine

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      Abstract: Abstract Compound-specific stable isotope analysis provides an alternative method to insight into the biotransformation mechanisms of diffuse organic pollutants in the environment, e.g., the endocrine disruptor herbicide atrazine. Biotic hydrolysis process catalyzed by chlorohydrolase AtzA and TrzN plays an important role in the detoxification of atrazine, while the catalytic mechanism of AtzA is still speculative. To investigate the catalytic mechanism of AtzA and answer whether both enzymes catalyze hydrolytic dechlorination of atrazine by the same mechanism, in this study, apparent kinetic isotope effects (AKIE) for carbon and nitrogen were observed by three atzA-harboring bacterial isolates and their membrane-free extracts. The AKIEs obtained from atzA-harboring bacterial isolates (AKIEC = 1.021 ± 0.010, AKIEN = 0.992 ± 0.003) were statistically different from that of trzN-harboring strains (AKIEC = 1.040 ± 0.006, AKIEN = 0.983 ± 0.006), confirming the different activation mechanisms of atrazine preceding to nucleophilic aromatic substitution of Cl atom in actual enzymatic reaction catalyzed by AtzA and TrzN, despite the limitation of variable dual-element isotope plots. The lower degree of normal carbon and inverse nitrogen isotope fractionation observed from atzA-harboring strains, suggesting AtzA catalyzing hydrolytic dechlorination of atrazine by coordination of Cl and one aromatic N to the Fe2+ drawing electron density from carbon-chlorine bond that facilitating the nucleophilic attack, rather than in TrzN case that protonation of aromatic N increasing nucleophilic substitution of Cl atom. This study suggests considering the potential influences of phylogenetic diversity of bacterial isolates and evolution of enzymes on the applications of CSIA method in future study.
      PubDate: 2022-03-07
      DOI: 10.1007/s10532-022-09977-y
       
  • Hydrocarbon-degrading bacteria in Colombia: systematic review

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      Abstract: Abstract Petroleum industry activities worldwide have caused pollution and resulted in environmental degradation. Microorganisms with the potential to reduce pollutant levels by degradation processes have been reported, and bacteria are among such organisms. The first study on bacterial degradation in Colombia was published in 1996. The study isolated bacteria belonging to the Pseudomonas genus from hydrocarbon-polluted sediments. Since then, different reports on degrading bacteria have been published. The objective of this systematic review is to identify and analyze all the studies on hydrocarbon-degrading bacteria performed in Colombia. To accomplish this goal, a literature search was conducted. Inclusion and exclusion criteria were applied, and 37 relevant articles were obtained. We found that 2018 was the year with the largest number of publications in Colombia, and most frequently identified bacterial genera were Pseudomonas and Bacillus. Some studies showed that the degradation of hydrocarbons is more efficient when bacterial consortia are used rather than pure cultures. This study provides information about bacteria with the potential to degrade hydrocarbons in Colombia, which in turn will be a source of information for future studies in this field.
      PubDate: 2022-03-02
      DOI: 10.1007/s10532-022-09976-z
       
  • Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under
           aerobic conditions

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      Abstract: Abstract The study evaluated the co-metabolism of nonylphenol polyethoxylate (NPEO) within a main substrate stream subjected to biodegradation in an activated sludge system. Peptone mixture simulating sewage was selected as the synthetic substrate. As a novel approach, the NPEO concentration was magnified to match the COD level of the peptone mixture, so that co-metabolism could be evaluated by respirometry and modeling. A sequencing batch reactor (SBR) set-up at high sludge age to also allow nitrification was operated for this purpose. A long acclimation phase was necessary to start NPEO biodegradation, which was completed with 15% residual by-products. Modeling of respirometric data could identify COD fractions of NPEO with corresponding process kinetics for the first time, where the biodegradation of by-products could be interpreted numerically as a hydrolysis mechanism. Nonylphenol diethoxylate (NP2EO) was observed as the major by-product affecting the biodegradation of NPEO, because NPEO and NP2EO accounted for 60 to 70% of the total soluble COD in the solution during the course of biological reactions. The co-metabolism characteristics basically defined NPEO as a substrate, with no appreciable inhibitory action on the microbial culture both in terms of heterotrophic and autotrophic activities.
      PubDate: 2022-02-10
      DOI: 10.1007/s10532-022-09974-1
       
  • Biological recovery of phosphorus from waste activated sludge via alkaline
           fermentation and struvite biomineralization by Brevibacterium antiquum

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      Abstract: Abstract Struvite biomineralization is a promising method for phosphorus recovery from wastewater treatment plant streams, and the growth of responsible microorganisms in mixed cultures is one of the most critical points for applying this process in pilot and full-scale. This study aimed to investigate the growth and bio-struvite production of Brevibacterium antiquum in mixed sludge culture. Alkaline fermentation was applied at different pH conditions to enhance the phosphorus content of sludge for an efficient recovery, and pH 8 was determined as the most feasible considering the phosphorus release and sludge characteristics. Growth optimization studies showed that NaCl's presence decreases the growth rate of Brevibacterium antiquum and bio-struvite production. At the same time, pH in the range of 6.8–8.2 did not alter the growth significantly. In addition, studies showed the ability of Brevibacterium antiquum in unsterilized fermented sludge centrate to grow and recover the phosphorus as struvite. Thus, our results indicated the potential of struvite biomineralization in full-scale wastewater treatment plants.
      PubDate: 2022-02-10
      DOI: 10.1007/s10532-022-09975-0
       
  • Performance analysis of Pseudomonas sp. strain SA3 in naphthalene
           degradation using phytotoxicity and microcosm studies

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      Abstract: Abstract The present study is aimed to develop a microbial system for efficient naphthalene bioremediation. A phytotoxicity study was carried out to check the naphthalene detoxification efficiency of Pseudomonas sp. strain SA3 in mung bean (Vigna radiata). For this, administration of the degraded product (supernatant) of 500 mg L−1 naphthalene by Pseudomonas sp. strain SA3 was studied on V. radiata till 168 h. The growth parameters of mung bean seedlings exposed to treated naphthalene solution were statistically similar to distilled water but a twofold decrease when exposed to untreated naphthalene solution. Further, through the soil microcosm study, the naphthalene degradation by pure colonies of Pseudomonas sp. strain SA3 was 6.8% higher as compared to when the natural microflora was mixed with Pseudomonas sp. strain SA3. Further naphthalene degradation by a microcosm model revealed that with an increased concentration of glucose, the carbon dioxide trap rate decreases.
      PubDate: 2022-02-01
      DOI: 10.1007/s10532-022-09972-3
       
  • Effect of biostimulation and bioaugmentation on biodegradation of high
           concentrations of 1,4-dioxane

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      Abstract: Abstract 1,4-Dioxane is a pervasive and persistent contaminant in numerous aquifers. Although the median concentration in most contaminant plumes is in the microgram per liter range, a subset of sites have contamination in the milligram per liter range. Most prior studies that have examined 1,4-dioxane concentrations in the hundreds of milligrams per liter range have been performed with industrial wastewater. The main objective of this study was to evaluate aerobic biodegradation of 1,4-dioxane in microcosms prepared with soil and groundwater from a site where concentrations range from ~ 1500 mg·L−1 in the source zone, to 450 mg·L−1 at a midpoint of the groundwater plume, and to 6 mg·L−1 at a down-gradient location. Treatments included biostimulation with propane, addition of propane and a propanotrophic enrichment culture (ENV487), and unamended. The highest rates of biodegradation for each location in the plume occurred in the bioaugmented treatments, although indigenous propanotrophs also biodegraded 1,4-dioxane to below 25 µg·L−1. Nutrient additions were required to sustain biodegradation of propane and cometabolism of 1,4-dioxane. Among the unamended treatments, biodegradation of 1,4-dioxane was detected in the mid-gradient microcosms. An isolate was obtained that grows on 1,4-dioxane as a sole source of carbon and energy and identified through whole-genome sequencing as Pseudonocardia dioxivorans BERK-1. In a prior study, the same strain was isolated from an aquifer in the southeastern United States. Monod kinetic parameters for BERK-1 are similar to those for strain CB1190.
      PubDate: 2022-01-31
      DOI: 10.1007/s10532-022-09971-4
       
  • Evaluation of in situ biosurfactant production by inoculum of P. putida
           and nutrient addition for the removal of polycyclic aromatic hydrocarbons
           from aged oil-polluted soil

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      Abstract: Abstract This work aimed to conduct a laboratory study to evaluate the use of Pseudomonas putida CB-100 and nutrient addition for the removal of PAHs from an aged oil-polluted soil of Veracruz, Mexico. Pseudomonas putida is a biosurfactant-producing bacterium capable of metabolizing polycyclic aromatic hydrocarbons (PAHs), which are toxic compounds with low water solubility, high melting, and boiling points, and low vapor pressure; characteristics that increase as their molecular weight increases and make them more recalcitrant. The methodology consisted in sampling the long-term oil-polluted soil and testing the use of Gamma irradiation (25 kGy) for the sterilization of the soil for abiotic control. We evaluated serological bottles containing 20 g of 35% moist soil (irradiated and non-irradiated) with the following treatments: the addition of nutrients (NH4Cl, NaNO3, KH2PO4, and K2HPO4), an inoculum of P. putida, and both P. putida and nutrients. The parameters assessed were pH, organic matter, humidity, available phosphorus, total nitrogen, cultivable heterotrophic microorganisms, CO2 production, rhamnolipids, surface tension, and the removal of eleven PAHs. The non-irradiated soil added with P. putida was the most efficient in the removal of PAHs; the pattern was: Benzo(a)anthracene > Phenanthrene > Fluoranthene > Benzo(k)fluoranthene > Chrysene > Pyrene > Anthracene > Acenaphthylene > Benzo(b)fluoranthene. In conclusion, P. putida in the non-irradiated soil produced in situ biosurfactants (1.55 mg/kg of rhamnolipids and an 11.9 mN/m decrease in surface tension) and removed PAHs in 10 days.
      PubDate: 2022-01-29
      DOI: 10.1007/s10532-022-09973-2
       
  • Alterations of endophytic microbial community function in Spartina
           alterniflora as a result of crude oil exposure

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      Abstract: Abstract The 2010 Deepwater Horizon disaster remains one of the largest oil spills in history. This event caused significant damage to coastal ecosystems, the full extent of which has yet to be fully determined. Crude oil contains toxic heavy metals and substances such as polycyclic aromatic hydrocarbons that are detrimental to some microbial species and may be used as food and energy resources by others. As a result, oil spills have the potential to cause significant shifts in microbial communities. This study assessed the impact of oil contamination on the function of endophytic microbial communities associated with saltmarsh cordgrass (Spartina alterniflora). Soil samples were collected from two locations in coastal Louisiana, USA: one severely affected by the Deepwater Horizon oil spill and one relatively unaffected location. Spartina alterniflora seedlings were grown in both soil samples in greenhouses, and GeoChip 5.0 was used to evaluate the endophytic microbial metatranscriptome shifts in response to host plant oil exposure. Oil exposure was associated with significant shifts in microbial gene expression in functional categories related to carbon cycling, virulence, metal homeostasis, organic remediation, and phosphorus utilization. Notably, significant increases in expression were observed in genes related to metal detoxification with the exception of chromium, and both significant increases and decreases in expression were observed in functional gene subcategories related to hydrocarbon metabolism. These findings show that host oil exposure elicits multiple changes in gene expression from their endophytic microbial communities, producing effects that may potentially impact host plant fitness.
      PubDate: 2022-01-18
      DOI: 10.1007/s10532-021-09968-5
       
  • LcaR: a regulatory switch from Pseudomonas aeruginosa for bioengineering
           alkane degrading bacteria

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      Abstract: Abstract Application of genetically engineered bacterial strains for biodegradation of hydrocarbons is a sustainable solution for treating pollutants as well as in industrial applications. However, the process of bioengineering should be carefully carried out to optimize the output. Investigation of regulatory genes for bioengineering is essential for developing synthetic circuits for effective biocatalysts. Here we focus on LcaR, a putative transcriptional regulator affecting the expression of alkB2 and lcaR operon that has a high potential to become a tool in designing such pathways. Four LcaR dimers bind specifically to the upstream regulatory region where divergent promoters of alkB2 and lcaR genes are located with high affinity at a Kd of 0.94 ± 0.17 nM and a Hill coefficient is 1.7 ± 0.3 demonstrating cooperativity in the association. Ligand binding alters the conformation of LcaR, which releases the regulator from its cognate DNA. Tetradecanal and hexadecanal act as natural ligands of LcaR with an IC50 values of 3.96 ± 0.59 µg/ml and 0.68 ± 0.21 µg/ml, respectively. The structure and function of transcription factors homologous to LcaR have not been characterized to date. This study provides insight into regulatory mechanisms of alkane degradation with a direction towards potential applications in bioengineering for bioremediation and industrial applications.
      PubDate: 2022-01-06
      DOI: 10.1007/s10532-021-09970-x
       
  • Biodegradation of 4-hydroxybenzoic acid by Acinetobacter johnsonii FZ-5
           and Klebsiella oxytoca FZ-8 under anaerobic conditions

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      Abstract: Abstract 4-Hydroxybenzoic acid (4-HBA) is a common organic compound that is prevalent in the environment, and the persistence of 4-HBA residues results in exertion of pollution-related detrimental effects. Bioremediation is an effective method for the removal of 4-HBA from the environment. In this study, two bacterial strains FZ-5 and FZ-8 capable of utilizing 4-HBA as the sole carbon and energy source under anaerobic conditions were isolated from marine sediment samples. Phylogenetic analysis identified the two strains FZ-5 and FZ-8 as Acinetobacter johnsonii and Klebsiella oxytoca, respectively. The strains FZ-5 and FZ-8 degraded 2000 mg·L−1 4-HBA in 72 h with degradation rates of 71.04% and 80.10%, respectively. The optimum culture conditions for degradation by the strains and crude enzymes were also investigated. The strains FZ-5 and FZ-8 also exhibited the ability to degrade other lignin-derived compounds, such as protocatechuic acid, cinnamic acid, and vanillic acid. Immobilization of the two strains showed that they could be used for the bioremediation of 4-HBA in an aqueous environment. Soils inoculated with the strains FZ-5 and FZ-8 showed higher degradation of 4-HBA than the uninoculated soil, and the strains could survive efficiently in anaerobic soil. This is the first report of 4-HBA-degrading bacteria, belonging to the two genera, which showed degradation ability under anaerobic conditions. This study expound the strains could efficiently degrade 4-HBA in anaerobic soil and will help in the development of 4-HBA anaerobic bioremediation systems.
      PubDate: 2021-10-05
      DOI: 10.1007/s10532-021-09963-w
       
 
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