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https://www.readbyqxmd.com/read/28929800/microcosm-investigation-of-growth-and-phytoremediation-potential-of-azolla-japonica-along-nitrogen-gradients
#1
Hun Park, Uhram Song
Although Azolla species are among the most promising plants for use in phytoremediation, more studies on their growth and nitrogen (N) uptake along the N gradients of growing media are required. In this study, N concentration-dependent growth in growing media and phosphorus (P) and N accumulation by Azolla japonica were studied by estimating direct N uptake from media by molybdenum-iron proteins. The doubling time of A. japonica was less than a week, regardless of the N concentration (0, 5, and 25 mg N/L) present in the growth media, indicating that this plant is suitable for remediation...
October 3, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28928502/accelerated-fermentation-of-idli-batter-using-eleusine-coracana-and-pennisetum-glaucum
#2
Ramachandran Chelliah, Sudha Rani Ramakrishnan, Divya Premkumar, Usha Antony
The present study focuses on reduction in fermentation time of idli batter and its enrichment with calcium and iron using finger millet and pearl millet. Fermentation time decreased from 12 to 6 h with addition of finger millet and to 8 h with pearl millet. Rate of fermentation, bulk density, viscosity, microbial changes and particle morphology were assessed in the batter; nutritional quality, sensory, phytochemicals and internal characteristics of idli were investigated. The color and texture characteristics of both batter and idli were evaluated...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28924168/investigation-of-a-spontaneous-mutant-reveals-novel-features-of-iron-uptake-in-shewanella-oneidensis
#3
Ziyang Dong, Shupan Guo, Huihui Fu, Haichun Gao
Shewanella oneidensis is among the first and the best studied bacteria capable of respiring minerals as terminal electron acceptors (EAs), including a variety of iron ores. This respiration process relies on a large number of c-type cytochromes, which per se are iron-containing proteins. Thus, iron plays an essential and special role in iron respiration of S. oneidensis, prompting extensive investigations into iron physiology. Despite this, we still know surprisingly little about the components and characteristics of iron transport in this bacterium...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28924022/pan-genomic-analyses-identify-key-helicobacter-pylori-pathogenic-loci-modified-by-carcinogenic-host-microenvironments
#4
Jennifer M Noto, Abha Chopra, John T Loh, Judith Romero-Gallo, M Blanca Piazuelo, Mark Watson, Shay Leary, Amber C Beckett, Keith T Wilson, Timothy L Cover, Simon Mallal, Dawn A Israel, Richard M Peek
OBJECTIVE: Helicobacter pylori is the strongest risk factor for gastric cancer; however, the majority of infected individuals do not develop disease. Pathological outcomes are mediated by complex interactions among bacterial, host and environmental constituents, and two dietary factors linked with gastric cancer risk are iron deficiency and high salt. We hypothesised that prolonged adaptation of H. pylori to in vivo carcinogenic microenvironments results in genetic modification important for disease...
September 18, 2017: Gut
https://www.readbyqxmd.com/read/28923608/molecular-characterization-and-phylogenetic-analysis-of-highly-pathogenic-vibrio-alginolyticus-strains-isolated-during-mortality-outbreaks-in-cultured-ruditapes-decussatus-juvenile
#5
Badreddine Mechri, Monastiri Abir, Amel Medhioub, Mohamed Nejib Medhioub, Mahjoub Aouni
In the summer of 2008 and 2009, a series of mortalities in growing out seeds of R. decussatus juveniles were occurred in the eastern Tunisian littoral. Nine predominant bacterial strains were isolated from dead and moribund juveniles and characterized as Vibrio alginolyticus. These isolates were subjected to biochemical and molecular characterization. All the Vibrio strains were tested for their susceptibility against the most widely used antibiotic in aquaculture as well as, the assessment of the presence of erythromycin (emrB) and tetracycline (tetS) resistance genes among the tested bacteria...
September 15, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28919551/identification-of-potential-antigens-from-non-classically-secreted-proteins-and-designing-novel-multitope-peptide-vaccine-candidate-against-brucella-melitensis-through-reverse-vaccinology-and-immunoinformatics-approach
#6
Udayakumar S Vishnu, Jagadesan Sankarasubramanian, Paramasamy Gunasekaran, Jeyaprakash Rajendhran
Brucella melitensis is an intracellular pathogen resides in the professional and non-professional phagocytes of the host, causing zoonotic disease brucellosis. The stealthy nature of the Brucella makes it's highly pathogenic, and it is hard to eliminate the bacteria completely from the infected host. Hitherto, no licensed vaccines are available for human brucellosis. In this study, we identified potential antigens for vaccine development from non-classically secreted proteins through reverse vaccinology approach...
September 14, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28919419/binding-mode-of-metal-ions-to-the-bacterial-iron-import-protein-efeo
#7
Kanate Temtrirath, Kenji Okumura, Yukie Maruyama, Bunzo Mikami, Kousaku Murata, Wataru Hashimoto
The tripartite EfeUOB system functions as a low pH iron importer in Gram-negative bacteria. In the alginate-assimilating bacterium Sphingomonas sp. strain A1, an additional EfeO-like protein (Algp7) is encoded downstream of the efeUOB operon. Here we show the metal binding mode of Algp7, which carries a M_75 metallopeptidase motif. The Algp7 protein was purified from recombinant E. coli cells and was subsequently characterized using differential scanning fluorimetry, fluorescence spectrometry, atomic absorption spectroscopy, and X-ray crystallography...
September 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28918899/stem-loop-structures-within-mrna-coding-sequences-activate-translation-initiation-and-mediate-control-by-small-regulatory-rnas
#8
Jonathan Jagodnik, Claude Chiaruttini, Maude Guillier
Initiation is the rate-limiting step of translation, and in bacteria, mRNA secondary structure has been extensively reported as limiting the efficiency of translation by occluding the ribosome-binding site. In striking contrast with this inhibitory effect, we report here that stem-loop structures located within coding sequences instead activate translation initiation of the Escherichia coli fepA and bamA mRNAs involved in iron acquisition and outer membrane proteins assembly, respectively. Both structures promote ribosome binding in vitro, independently of their nucleotide sequence...
September 11, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28913898/structural-basis-for-binding-and-transfer-of-heme-in-bacterial-heme-acquisition-systems
#9
Youichi Naoe, Nozomi Nakamura, Md Mahfuzur Rahman, Takehiko Tosha, Satoru Nagatoishi, Kouhei Tsumoto, Yoshitsugu Shiro, Hiroshi Sugimoto
Periplasmic heme-binding proteins (PBPs) in Gram-negative bacteria are components of the heme acquisition system. These proteins shuttle heme across the periplasmic space from outer membrane receptors to ATP-binding cassette (ABC) heme importers located in the inner-membrane. In the present study, we characterized the structures of PBPs found in the pathogen Burkholderia cenocepacia (BhuT) and in the thermophile Roseiflexus sp. RS-1 (RhuT) in the heme-free and heme-bound forms. The conserved motif, in which a well-conserved Tyr interacts with the nearby Arg coordinates on heme iron, was observed in both PBPs...
September 14, 2017: Proteins
https://www.readbyqxmd.com/read/28902008/fibrous-catalyst-enhanced-acanthamoeba-disinfection-by-hydrogen-peroxide
#10
Simon Kilvington, Lynn Winterton
SIGNIFICANCE: Hydrogen peroxide (H2O2) disinfection systems are contact-lens-patient problem solvers. The current one-step, criterion-standard version has been widely used since the mid-1980s, without any significant improvement. This work identifies a potential next-generation, one-step H2O2, not based on the solution formulation but rather on a case-based peroxide catalyst. PURPOSE: One-step H2O2 systems are widely used for contact lens disinfection. However, antimicrobial efficacy can be limited because of the rapid neutralization of the peroxide from the catalytic component of the systems...
September 9, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28900692/tonb-dependent-utilization-of-dihydroxamate-xenosiderophores-in-synechocystis-sp-pcc-6803
#11
Michael M Babykin, Tobias S A Obando, Vladislav V Zinchenko
In Gram-negative bacteria, transport of ferric siderophores through outer membrane is a complex process that requires specific outer membrane transporters and energy-transducing TonB-ExbB-ExbD system in the cytoplasmic membrane. The genome of the non-siderophore-producing cyanobacterium Synechocystis sp. PCC 6803 encodes all putative components of the siderophore-mediated iron uptake system. So far, there has been no experimental evidence for the existence of such a pathway in this organism. On the contrary, its reductive iron uptake pathway has been studied in detail...
September 12, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28900278/function-coupling-mechanism-of-phus-and-hemo-in-heme-degradation
#12
Michael J Y Lee, Ye Wang, Yafei Jiang, Xichen Li, Jianqiu Ma, Hongwei Tan, Keegan Turner-Wood, Mona N Rahman, Guangju Chen, Zongchao Jia
Most bacteria possess only one heme-degrading enzyme for obtaining iron, however few bacteria such as Pseudomonas aeruginosa express two, namely PhuS and HemO. While HemO is a well-known heme oxygenase, previously we discovered that PhuS also possesses heme degradation activity and generates verdoheme, an intermediate of heme breakdown. To understand the coexistence of these two enzymes, using the DFT calculation we reveal that PhuS effectively enhances heme degradation through its participation in heme hydroxylation, the rate limiting reaction...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893176/the-path-to-re-evolve-cooperation-is-constrained-in-pseudomonas-aeruginosa
#13
Elisa T Granato, Rolf Kümmerli
BACKGROUND: A common form of cooperation in bacteria is based on the secretion of beneficial metabolites, shareable as public good among cells within a group. Because cooperation can be exploited by "cheating" mutants, which contribute less or nothing to the public good, there has been great interest in understanding the conditions required for cooperation to remain evolutionarily stable. In contrast, much less is known about whether cheats, once fixed in the population, are able to revert back to cooperation when conditions change...
September 11, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28892683/promoting-electron-transfer-to-enhance-anaerobic-treatment-of-azo-dye-wastewater-with-adding-fe-oh-3
#14
Shiyang Li, Yi Cao, Cancan Bi, Yaobin Zhang
In this study, Fe(OH)3 was dosed into anaerobic reactor (R1) to stimulate the electron transfer process during the decoloration treatment. As results indicated, the chemical oxygen demand (COD) removal and decoloration efficiency were increased by 61.7% and 32.0% than that of the control reactor (R2), respectively. The cyclic-voltammetric analysis of the effluent demonstrated that the cycles of Fe(III)/Fe(II) and 1-imino-2-napthoquinone/1-amino-2-napthol (oxidative/reductive state of the decoloration intermediate product) had been established in R1...
August 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28892310/genetic-diversity-of-marine-anaerobic-ammonium-oxidizing-bacteria-as-revealed-by-genomic-and-proteomic-analyses-of-candidatus-scalindua-japonica
#15
Mamoru Oshiki, Keisuke Mizuto, Zenichiro Kimura, Tomonori Kindaichi, Hisashi Satoh, Satoshi Okabe
Anaerobic ammonium-oxidizing (anammox) bacteria affiliated with the genus 'Candidatus Scalindua' are responsible for significant nitrogen loss in oceans, and thus their ecophysiology is of great interest. Here, we enriched a marine anammox bacterium, 'Ca. S. japonica' from a Hiroshima bay sediment in Japan, and comparative genomic and proteomic analyses of 'Ca. S. japonica' were conducted. Sequence of the 4.81-Mb genome containing 4,019 coding regions of genes (CDSs) composed of 47 contigs was determined. In the proteome, 1,762 out of 4,019 CDSs in the 'Ca...
September 11, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28886540/paddy-soil-microbial-communities-driven-by-environment-and-microbe-microbe-interactions-a-case-study-of-elevation-resolved-microbial-communities-in-a-rice-terrace
#16
Weimin Sun, Enzong Xiao, Ziluo Pu, Valdis Krumins, Yiran Dong, Baoqin Li, Min Hu
Rice paddies are a significant source of the greenhouse gas methane, which mainly originates from microbial activity. Methane generation in anaerobic systems involves complex interactions of multiple functional microbial groups. Rice paddies installed in hilly terrain are often terraced, providing multiple quasi-independent plots differing primarily in their elevation up a hillside. This represents an excellent study site to explore the influence of environmental factors on microbial communities and interactions among microbial populations...
September 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28885593/effect-of-iron-oxide-nanoparticles-and-amoxicillin-on-bacterial-growth-in-the-presence-of-dissolved-organic-carbon
#17
Kelley M Current, Niluka M Dissanayake, Sherine O Obare
The impact of emerging contaminants in the presence of active pharmaceutical pollutants plays an important role in the persistence and activity of environmental bacteria. This manuscript focuses on the impact of amoxicillin functionalized iron oxide nanoparticles on bacterial growth, in the presence of dissolved organic carbon (humic acid). The impact of these emerging contaminants individually and collectively on the growth profiles of model gram positive and negative bacteria was tracked for 24 h. Results indicate exposure to subinhibitory concentrations of amoxicillin bound iron oxide nanoparticles, in the presence of humic acid, increase bacterial growth in Pseudomonas aeruginosa and Staphylococcus aureus...
September 8, 2017: Biomedicines
https://www.readbyqxmd.com/read/28882201/b-subtilis-as-a-model-for-studying-the-assembly-of-fe-s-clusters-in-gram-positive-bacteria
#18
Patricia C Dos Santos
Complexes of iron and sulfur (Fe-S clusters) are widely distributed in nature and participate in essential biochemical reactions. The biological formation of Fe-S clusters involves dedicated pathways responsible for the mobilization of sulfur, the assembly of Fe-S clusters, and the transfer of these clusters to target proteins. Genomic analysis of Bacillus subtilis and other Gram-positive bacteria indicated the presence of only one Fe-S cluster biosynthesis pathway, which is distinct in number of components and organization from previously studied systems...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28881210/total-electron-acceptor-loading-and-composition-affect-hexavalent-uranium-reduction-and-microbial-community-structure-in-a-membrane-biofilm-reactor
#19
Aura Ontiveros-Valencia, Chen Zhou, Zehra Esra Ilhan, Louis Cornette de Saint Cyr, Rosa Krajmalnik-Brown, Bruce E Rittmann
Molecular microbiology tools (i.e., 16S rDNA gene sequencing) were employed to elucidate changes in the microbial community structure according to the total electron acceptor loading (controlled by influent flow rate and/or medium composition) in a H2-based membrane biofilm reactor evaluated for removal of hexavalent uranium. Once nitrate, sulfate, and dissolved oxygen were replaced by U(VI) and bicarbonate and the total acceptor loading was lowered, slow-growing bacteria capable of reducing U(VI) to U(IV) dominated in the biofilm community: Replacing denitrifying bacteria Rhodocyclales and Burkholderiales were spore-producing Clostridiales and Natranaerobiales...
August 29, 2017: Water Research
https://www.readbyqxmd.com/read/28876357/phosphate-solubilization-by-endophytic-bacteria-isolated-from-banana-trees
#20
Amanda D M Matos, Izabela C P Gomes, Silvia Nietsche, Adelica A Xavier, Wellington S Gomes, José A Dos Santos, Marlon C T Pereira
Forty isolates of endophytic bacteria isolated from banana tree roots were assessed as to their capacity to solubilize phosphate in a solid culture medium supplemented with different inorganic and one organic source of phosphorus. The amount of phosphorus (P) in each liquid medium was quantified, and an indirect assessment of acid phosphatase activity was performed. All assays had a fully randomized design, with three repetitions. Approximately 67.5% of the 40 isolates assessed in solid medium solubilized phosphorus from tricalcium phosphate and 7...
September 4, 2017: Anais da Academia Brasileira de Ciências
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