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Archives of Microbiology

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https://www.readbyqxmd.com/read/28074233/microbial-diversity-in-different-compartments-of-an-aquaponics-system
#1
Zala Schmautz, Andreas Graber, Sebastian Jaenicke, Alexander Goesmann, Ranka Junge, Theo H M Smits
Aquaponics is a solution for sustainable production of fish and plants in a single semi-closed system, where nutrient-rich water from the aquaculture provides nutrients for plant growth. We examined the microbial communities within an experimental aquaponics system. Whereas the fish feces contained a separate community dominated by bacteria of the genus Cetobacterium, the samples from plant roots, biofilter, and periphyton were more similar to each other, while the communities were more diverse. Detailed examination of the data gave the first indications to functional groups of organisms in the different compartments of the aquaponic system...
January 10, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28070613/the-plant-growth-promoting-effect-of-the-nitrogen-fixing-endophyte-pseudomonas-stutzeri-a15
#2
Van T K Pham, Hans Rediers, Maarten G K Ghequire, Hiep H Nguyen, René De Mot, Jos Vanderleyden, Stijn Spaepen
The use of plant growth-promoting rhizobacteria as a sustainable alternative for chemical nitrogen fertilizers has been explored for many economically important crops. For one such strain isolated from rice rhizosphere and endosphere, nitrogen-fixing Pseudomonas stutzeri A15, unequivocal evidence of the plant growth-promoting effect and the potential contribution of biological nitrogen fixation (BNF) is still lacking. In this study, we investigated the effect of P. stutzeri A15 inoculation on the growth of rice seedlings in greenhouse conditions...
January 9, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28058488/inhibition-of-staphylococcus-aureus-in-vitro-by-bacteriocinogenic-lactococcus-lactis-kth0-1s-isolated-from-thai-fermented-shrimp-kung-som-and-safety-evaluation
#3
Sutanate Saelao, Suppasil Maneerat, Sireewan Kaewsuwan, Hanitra Rabesona, Yvan Choiset, Thomas Haertlé, Jean-Marc Chobert
Lactococcus lactis KTH0-1S isolated from Thai traditional fermented shrimp (Kung-som) is able to produce heat-stable bacteriocin and inhibits food spoilage bacteria and food-borne pathogens. The inhibitory effect of bacteriocin remained intact after treatment with different pHs and after heating, but was sensitive to some proteolytic enzymes. Addition of bacteriocin KTH0-1S to Staphylococcus aureus cultures decreased viable cell counts by 2.8 log CFU/ml, demonstrating a bactericidal mode of action. Furthermore, the growth of S...
January 5, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28032191/chitin-degradation-and-utilization-by-virulent-aeromonas-hydrophila-strain-ml10-51k
#4
Dunhua Zhang, De-Hai Xu, Junqiang Qiu, Cody R Rasmussen-Ivey, Mark R Liles, Benjamin H Beck
Virulent Aeromonas hydrophila (vAh) is one of the most important bacterial pathogens that causes persistent outbreaks of motile Aeromonas septicemia in warm-water fishes. The survivability of this pathogen in aquatic environments is of great concern. The aim of this study was to determine the capability of the vAh strain ML10-51K to degrade and utilize chitin. Genome-wide analysis revealed that ML10-51K encodes a suite of proteins for chitin metabolism. Assays in vitro showed that four chitinases, one chitobiase and one chitin-binding protein were secreted extracellularly and participated in chitin degradation...
December 28, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/28032190/litorivivens-aequoris-sp-nov-a-gammaproteobacterium-isolated-from-seawater
#5
Sangeun Jun, Jaewoo Yoon
A Gram-stain-negative, strictly aerobic, beige-pigmented, motile, chemoheterotrophic, rod-shaped or ovoid bacterium, designated strain KMU-37(T), was isolated from seawater at Najeong Beach in the Republic of Korea. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that the novel isolate was affiliated with the genus Litorivivens, class Gammaproteobacteria, showing highest sequence similarity (97.4%) to Litorivivens lipolytica HJTF-7(T). The DNA-DNA relatedness values between strains KMU-37(T) and L...
December 28, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/28028566/lacinutrix-chionocetis-sp-nov-isolated-from-gut-of-a-red-snow-crab
#6
Hyangmi Kim, Sang-Chul Yoon, Kwang-Ho Choi, Sung-Tae Kim, Jae-Bong Lee, Dong-Sun Kim, Ho Le Han, Kyung Sook Bae, Doo-Sang Park
A Gram-negative, aerobic, non-motile, rod-shaped bacterial strain, designated MAB-07(T), was isolated from the gut of a red snow crab. The novel strain grew optimally at 20 °C, pH 7.0-8.0, and in the presence of 3% (w/v) NaCl. A phylogenetic analysis based on the 16S rRNA gene sequence indicated that the strain MAB-07(T) belongs to the type strains of species of the genus Lacinutrix. Strain MAB-07(T) exhibited 16S rRNA gene sequence similarity values of 95.5-97.8% with the type strains of species of the genus Lacinutrix...
December 27, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27995281/the-use-of-stable-and-unstable-green-fluorescent-proteins-for-studies-in-two-bacterial-models-agrobacterium-tumefaciens-and-xanthomonas-campestris-pv-campestris
#7
Pilar Sabuquillo, Adela Gea, Isabel M Matas, Cayo Ramos, Jaime Cubero
Fluorescent proteins have been used to track plant pathogens to understand their host interactions. To be useful, the transgenic pathogens must present similar behaviour than the wild-type isolates. Herein, a GFP marker was used to transform two plant pathogenic bacteria, Agrobacterium and Xanthomonas, to localize and track the bacteria during infection. The transgenic bacteria were evaluated to determine whether they showed the same fitness than the wild-type strains or whether the expression of the GFP protein interfered in the bacterial activity...
December 19, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27990555/root-associated-bacterial-diversities-of-oryza-rufipogon-and-oryza-sativa-and-their-influencing-environmental-factors
#8
Lei Tian, Xue Zhou, Lina Ma, Shangqi Xu, Fahad Nasir, Chunjie Tian
Oryza rufipogon is the ancestor of human-cultivated Oryza sativa. However, little is known about the difference between the root-associated microorganisms of O. rufipogon and O. sativa. In this study, the root-associated bacteria of O. rufipogon, Leersia hexandra, and O. sativa from different latitudes in China were studied by DGGE analysis. Their bacterial community structures were compared by principal component analysis. The relationship between root-associated bacteria and soil properties was explored by canonical correspondence analysis...
December 18, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27942773/vegetation-type-and-layer-depth-influence-nitrite-dependent-methane-oxidizing-bacteria-in-constructed-wetland
#9
Mengxi Yang, Qingwei Guo, Tianli Tong, Ningning Li, Shuguang Xie, Yan Long
Nitrite-dependent anaerobic methane oxidation (n-damo) process might be an important methane sink in wetland system. However, information on n-damo microorganisms in constructed wetland (CW) system for water treatment is still lacking. The present study investigated the n-damo communities in five full-scale vertical-flow CW systems with different plants. N-damo bacterial abundance did not show a considerable shift in CW planted with Cyperus papyrus, but varied greatly in other CW systems. However, the evident vertical change of n-damo community diversity occurred in each CW system...
December 10, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27888323/the-calmodulin-gene-in-neurospora-crassa-is-required-for-normal-vegetative-growth-ultraviolet-survival-and-sexual-development
#10
Vijya Laxmi, Ranjan Tamuli
We isolated a Neurospora crassa mutant of the calmodulin (cmd) gene using repeat-induced point mutation and studied its phenotypes. The cmd (RIP) mutant showed a defect in growth, reduced aerial hyphae, decreased carotenoid accumulation, a severe reduction in viability upon ultraviolet (UV) irradiation, and a fertility defect. Moreover, meiotic silencing of the cmd gene resulted in a barren phenotype. In addition, we also performed site-directed mutational analysis of the calcium/calmodulin-dependent kinase-2 (Ca(2+)/CaMK-2), a target of the CaM protein encoded by the cmd gene...
November 25, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27888322/allee-effect-the-story-behind-the-stabilization-or-extinction-of-microbial-ecosystem
#11
REVIEW
Madhurankhi Goswami, Purnita Bhattacharyya, Prosun Tribedi
A population exhibiting Allee effect shows a positive correlation between population fitness and population size or density. Allee effect decides the extinction or conservation of a microbial population and thus appears to be an important criterion in population ecology. The underlying factor of Allee effect that decides the stabilization and extinction of a particular population density is the threshold or the critical density of their abundance. According to Allee, microbial populations exhibit a definite, critical or threshold density, beyond which the population fitness of a particular population increases with the rise in population density and below it, the population fitness goes down with the decrease in population density...
November 25, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27888321/genetic-characterization-of-canine-parvovirus-type-2-subtypes-in-maputo-mozambique
#12
J Figueiredo, C Miranda, R Souto, E Silva, J Fafetine, G Thompson
Canine parvovirus type 2 (CPV-2) comprises three antigenic subtypes (2a, 2b and 2c) that have been reported in many countries. These subtypes cause serious disease in dogs with characteristic gastroenteritis signs. Little information has been documented in Africa about the genetic characterization of CPV-2. The aim of this study was to detect and to characterize the CPV-2 subtypes circulating in dogs admitted to Veterinary Clinics from two cities of Mozambique, Maputo and Matola, in 2010. A total of 40 field fecal samples were collected and tested for CPV-2 by polymerase chain reaction assay...
November 25, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27885407/effect-of-metal-sulfide-pulp-density-on-gene-expression-of-electron-transporters-in-acidithiobacillus-sp-fj2
#13
Faezeh Fatemi, Saba Miri, Samaneh Jahani
In Acidithiobacillus ferrooxidans, one of the most important bioleaching bacterial species, the proteins encoded by the rus operon are involved in the electron transfer from Fe(2+) to O2. To obtain further knowledge about the mechanism(s) involved in the adaptive responses of the bacteria to growth on the different uranium ore pulp densities, we analyzed the expression of the four genes from the rus operon by real-time PCR, when Acidithiobacillus sp. FJ2 was grown in the presence of different uranium concentrations...
November 24, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27872947/design-and-characterisation-of-synthetic-operons-for-biohydrogen-technology
#14
Ciaran M Lamont, Frank Sargent
Biohydrogen is produced by a number of microbial systems and the commonly used host bacterium Escherichia coli naturally produces hydrogen under fermentation conditions. One approach to engineering additional hydrogen production pathways is to introduce non-native hydrogenases into E. coli. An attractive candidate is the soluble [NiFe]-hydrogenase from Ralstonia eutropha, which has been shown to link NADH/NAD(+) biochemistry directly to hydrogen metabolism, an activity that E. coli does not perform. In this work, three synthetic operons were designed that code for the soluble hydrogenase and two different enzyme maturase systems...
November 21, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27864589/functionality-of-tn916-in-paenibacillus-larvae
#15
Douglas W Dingman
The conjugative transposon Tn916 was determined to be functional in Paenibacillus larvae in regard to expression of tetracycline resistance and conjugative transfer. Expression of erythromycin resistance, using Tn916ΔE, was also observed. Conjugative transfer experiments employing Paenibacillus popilliae strains Tc1001 and Em1001 as transposon donors and experiments using different P. larvae subspecies or different transposon-containing strains demonstrated interspecies and intraspecies transfer occurred for Tn916 and Tn916ΔE...
November 18, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27838734/acyl-homoserine-lactone-based-quorum-sensing-stimulates-biofilm-formation-by-salmonella-enteritidis-in-anaerobic-conditions
#16
Felipe Alves de Almeida, Natan de Jesus Pimentel-Filho, Uelinton Manoel Pinto, Hilário Cuquetto Mantovani, Leandro Licursi de Oliveira, Maria Cristina Dantas Vanetti
Quorum sensing regulates a variety of phenotypes in bacteria including the production of virulence factors. Salmonella spp. have quorum sensing systems mediated by three autoinducers (AI-1, AI-2, and AI-3). The AI-1-mediated system is incomplete in that the bacterium relies on the synthesis of signaling molecules by other microorganisms. This study aimed to evaluate the influence of the AI-1 N-dodecanoyl-DL-homoserine lactone (C12-HSL) on the growth, motility, adhesion, and biofilm formation of Salmonella enterica serovar Enteritidis PT4 578 on a polystyrene surface...
November 12, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27830270/comparative-study-of-rhizobacterial-communities-in-pepper-greenhouses-and-examination-of-the-effects-of-salt-accumulation-under-different-cropping-systems
#17
Mi-Seon Hahm, Jin-Soo Son, Byung-Soo Kim, Sa-Youl Ghim
This study compared rhizobacterial communities in pepper greenhouses under a paddy-upland (rice-pepper) rotational system (PURS) and a monoculture repeated cropping system (RCS) and examined adverse effects of high salinity on soil properties. The following soil properties were analyzed: electrical conductivity (EC), pH, concentration of four cations (Na, Ca, Mg, and K), total nitrogen, and organic matter content. Rhizobacterial communities were analyzed using culture-based and culture-independent (pyrosequencing) methods...
November 9, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27830269/inhibition-of-the-multidrug-efflux-pump-lmrs-from-staphylococcus-aureus-by-cumin-spice-cuminum-cyminum
#18
Prathusha Kakarla, Jared Floyd, MunMun Mukherjee, Amith R Devireddy, Madhuri A Inupakutika, Indrika Ranweera, Ranjana Kc, Ugina 'Shrestha, Upender Rao Cheeti, Thomas Mark Willmon, Jaclyn Adams, Merissa Bruns, Shravan Kumar Gunda, Manuel F Varela
Staphylococcus aureus is a serious causative agent of infectious disease. Multidrug-resistant strains like methicillin-resistant S. aureus compromise treatment efficacy, causing significant morbidity and mortality. Active efflux represents a major antimicrobial resistance mechanism. The proton-driven multidrug efflux pump, LmrS, actively exports structurally distinct antimicrobials. To circumvent resistance and restore clinical efficacy of antibiotics, efflux pump inhibitors are necessary, and natural edible spices like cumin are potential candidates...
November 9, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27816987/aspergillus-flavus-growth-inhibition-by-lactobacillus-strains-isolated-from-traditional-fermented-kenyan-milk-and-maize-products
#19
Sara Ahlberg, Vesa Joutsjoki, Sini Laurikkala, Pekka Varmanen, Hannu Korhonen
Certain strains of lactic acid bacteria have been reported to inhibit fungal growth and may so be potential as biocontrol agents. In this study, 171 LAB strains were isolated from traditional fermented Kenyan milk and maize products and tested against aflatoxin-producing A. flavus fungi. The three LAB strains showing highest antifungal activity were identified as Lactobacillus plantarum. None of the strains were able to completely inhibit fungal growth under conditions favorable for fungi and suboptimal for LAB...
November 5, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27815566/evidence-of-mercury-trapping-in-biofilm-eps-and-mer-operon-based-volatilization-of-inorganic-mercury-in-a-marine-bacterium-bacillus-cereus-bw-201b
#20
Hirak R Dash, Subham Basu, Surajit Das
Biofilm-forming mercury-resistant marine bacterium Bacillus cereus BW-201B has been explored to evident that the bacterial biofilm-EPS (exopolymers) trap inorganic mercury but subsequently release EPS-bound mercury for induction of mer operon-mediated volatilization of inorganic mercury. The isolate was able to tolerate 50 ppm of mercury and forms biofilm in presence of mercury. mer operon-mediated volatilization was confirmed, and -SH was found to be the key functional group of bacterial EPS responsible for mercury binding...
November 4, 2016: Archives of Microbiology
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