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https://www.readbyqxmd.com/read/28924251/cyanobacterial-exopolymer-properties-differentiate-microbial-carbonate-fabrics
#1
Fumito Shiraishi, Yusaku Hanzawa, Tomoyo Okumura, Naotaka Tomioka, Yu Kodama, Hiroki Suga, Yoshio Takahashi, Akihiro Kano
Although environmental changes and evolution of life are potentially recorded via microbial carbonates, including laminated stromatolites and clotted thrombolites, factors controlling their fabric are still a matter of controversy. Herein, we report that the exopolymer properties of different cyanobacterial taxa primarily control the microbial carbonates fabrics in modern examples. This study shows that the calcite encrustation of filamentous Phormidium sp. secreting acidic exopolymers forms the laminated fabric of stromatolites, whereas the encrustation of coccoid Coelosphaeriopsis sp...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28918447/an-improved-crystal-structure-of-c-phycoerythrin-from-the-marine-cyanobacterium-phormidium-sp-a09dm
#2
Ravi R Sonani, Aleksander W Roszak, Claire Ortmann de Percin Northumberland, Datta Madamwar, Richard J Cogdell
C-Phycoerythrin (PE) from Phormidium sp. A09DM has been crystallized using different conditions and its structure determined to atomic resolution (1.14 Å). In order for the pigment present, phycoerythrobilin (PEB), to function as an efficient light-harvesting molecule it must be held rigidly (Kupka and Scheer in Biochim Biophys Acta 1777:94-103, 2008) and, moreover, the different PEB molecules in PE must be arranged, relative to each other, so as to promote efficient energy transfer between them. This improved structure has allowed us to define in great detail the structure of the PEBs and their binding sites...
September 16, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28865614/identification-of-chlorophyll-molecules-with-peroxyl-radical-scavenger-capacity-in-microalgae-phormidium-autumnale-using-ultrasound-assisted-extraction
#3
Andrêssa S Fernandes, Gabriela P Nogara, Cristiano R Menezes, Alexandre J Cichoski, Adriana Z Mercadante, Eduardo Jacob-Lopes, Leila Q Zepka
The identification of chlorophyll molecules with peroxyl radical scavenger capacity in microalgae Phormidium autumnale was determined. The ultrasound-assisted extraction was utilized for obtaining the chlorophyll compounds from biomass. A total of eleven molecules were separated in microalgae chlorophyll extract, with pheophytin a' (371μg·g(-1)) and chlorophyll a (159.3μg·g(-1)) as the major ones. The chlorophyll extract was shown to be a potent scavenger of peroxyl radical, being almost 200 times more potent than α-tocopherol...
September 2017: Food Research International
https://www.readbyqxmd.com/read/28846906/spatiotemporal-dynamics-of-phormidium-cover-and-anatoxin-concentrations-in-eight-new-zealand-rivers-with-contrasting-nutrient-and-flow-regimes
#4
Tara G McAllister, Susanna A Wood, Javier Atalah, Ian Hawes
Toxic benthic cyanobacterial proliferations, particularly of the genus Phormidium, are a major concern in many countries due to their increasing extent and severity. The aim of this study was to improve the current understanding of the dominant physicochemical variables associated with high Phormidium cover and toxin concentrations. Phormidium cover and anatoxin concentrations were assessed weekly for 30weeks in eight predominately cobble-bed rivers in the South Island of New Zealand. Phormidium cover was highly variable both spatially (among and within sites) and temporally...
August 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28830829/phylogenetic-insights-into-the-diversity-of-homocytous-cyanobacteria-from-amazonian-rivers
#5
Diego Bonaldo Genuário, Marcelo Gomes Marçal Vieira Vaz, Itamar Soares de Melo
The Amazon Rainforest holds great tropical biodiversity, mainly because of its favourable climatic conditions. The high temperatures, luminosity and humidity coupled with the nutritional simplicity of cyanobacteria allow undiscovered diversity to flourish within this group of microorganisms. Some efforts to reveal this diversity have been attempted; however, most were focused on the microscopic observation of environmental samples without any genetic information. Very few studies focusing on morphological, ecological and molecular criteria have been conducted, and none have been devoted to homocytous cyanobacteria forms in Amazonia region...
August 19, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28736815/a-widespread-cyanobacterium-supported-by-polyphasic-approach-proposition-of-koinonema-pervagatum-gen-sp-nov-oscillatoriales-1
#6
Bruna Buch, Mariéllen Dornelles Martins, Luis Henrique Z Branco
Several new genera originally classified as the genus Phormidium, a polyphyletic and taxonomically complex genus within the Oscillatoriales, were recently described. The simple morphology of Phormidium does not reflect its genetic diversity and the delimitation of a natural group is not possible with traditional classification systems based on morphology alone. Therefore, this study used morphological, ecological, and molecular approaches to evaluate four populations morphologically similar to Ammassolinea, Kamptonema, and Ancylothrix (simple, curved, and gradually attenuated at the ends trichome), found in subtropical and tropical Brazilian regions...
July 24, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28680112/overcoming-microalgae-harvesting-barrier-by-activated-algae-granules
#7
Olga Tiron, Costel Bumbac, Elena Manea, Mihai Stefanescu, Mihai Nita Lazar
The economic factor of the microalgae harvesting step acts as a barrier to scaling up microalgae-based technology designed for wastewater treatment. In view of that, this study presents an alternative microalgae-bacteria system, which is proposed for eliminating the economic obstacle. Instead of the microalgae-bacteria (activated algae) flocs, the study aimed to develop activated algae granules comprising the microalgae Chlorella sp. as a target species. The presence of the filamentous microalgae (Phormidium sp...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28659875/predicting-species-resolved-macronutrient-acquisition-during-succession-in-a-model-phototrophic-biofilm-using-an-integrated-omics-approach
#8
Stephen R Lindemann, Jennifer M Mobberley, Jessica K Cole, L M Markillie, Ronald C Taylor, Eric Huang, William B Chrisler, H S Wiley, Mary S Lipton, William C Nelson, James K Fredrickson, Margaret F Romine
The principles governing acquisition and interspecies exchange of nutrients in microbial communities and how those exchanges impact community productivity are poorly understood. Here, we examine energy and macronutrient acquisition in unicyanobacterial consortia for which species-resolved genome information exists for all members, allowing us to use multi-omic approaches to predict species' abilities to acquire resources and examine expression of resource-acquisition genes during succession. Metabolic reconstruction indicated that a majority of heterotrophic community members lacked the genes required to directly acquire the inorganic nutrients provided in culture medium, suggesting high metabolic interdependency...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28646736/cell-damage-caused-by-ultraviolet-b-radiation-in-the-desert-cyanobacterium-phormidium-tenue-and-its-recovery-process
#9
Gaohong Wang, Songqiang Deng, Jiafeng Liu, Chaoran Ye, Xiangjun Zhou, Lanzhou Chen
Phormidium tenue, a cyanobacterium that grows in the topsoil of biological soil crusts (BSCs), has the highest recovery rate among desert crust cyanobacteria after exposure to ultraviolet B (UV-B) radiation. However, the mechanism underlying its recovery process is unclear. To address this issue, we measured chlorophyll a fluorescence, generation of reactive oxygen species (ROS), lipid peroxidation, and repair of DNA breakage in P. tenue following exposure to UV-B. We found that UV-B radiation at all doses tested reduced photosynthesis and induced cell damage in P...
June 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28644849/rapid-development-of-cyanobacterial-crust-in-the-field-for-combating-desertification
#10
Chan-Ho Park, Xin Rong Li, Yang Zhao, Rong Liang Jia, Jae-Seoun Hur
Desertification is currently a major concern, and vast regions have already been devastated in the arid zones of many countries. Combined application of cyanobacteria with soil fixing chemicals is a novel method of restoring desertified areas. Three cyanobacteria, Nostoc sp. Vaucher ex Bornet & Flahault, Phormidium sp. Kützing ex Gomont and Scytonema arcangeli Bornet ex Flahault were isolated and tested in this study. Tacki-SprayTM (TKS7), which consists of bio-polysaccharides and tackifiers, was used as a soil fixing agent...
2017: PloS One
https://www.readbyqxmd.com/read/28602983/box-behnken-design-for-extraction-optimization-of-crude-polysaccharides-from-tunisian-phormidium-versicolor-cyanobacteria-ncc-466-partial-characterization-in-vitro-antioxidant-and-antimicrobial-activities
#11
Dalel Belhaj, Donyez Frikha, Khaled Athmouni, Bouthaina Jerbi, Mohammad Boshir Ahmed, Zouhaier Bouallagui, Monem Kallel, Sami Maalej, John Zhou, Habib Ayadi
In this study, response surface methodology (RSM) based on Box-Behnken design (BBD) was employed to optimize the aqueous extraction of crude polysaccharides from Tunisian cyanobacteria Phormidium versicolor (NCC 466). The optimal extraction conditions with an extraction yield of 21.56±0.92% were as follows: extraction temperature at 81.05°C, extraction time of 3.99h, and water to raw material ratio of 21.52mLg(-1). Crude Phormidium versicolor polysaccharides (CPv-PS) are found to be a hetero-sulfated-anionic polysaccharides that contained carbohydrate (79...
June 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28559886/global-diversity-of-desert-hypolithic-cyanobacteria
#12
Donnabella C Lacap-Bugler, Kevin K Lee, Stephen Archer, Len N Gillman, Maggie C Y Lau, Sebastian Leuzinger, Charles K Lee, Teruya Maki, Christopher P McKay, John K Perrott, Asunción de Los Rios-Murillo, Kimberley A Warren-Rhodes, David W Hopkins, Stephen B Pointing
Global patterns in diversity were estimated for cyanobacteria-dominated hypolithic communities that colonize ventral surfaces of quartz stones and are common in desert environments. A total of 64 hypolithic communities were recovered from deserts on every continent plus a tropical moisture sufficient location. Community diversity was estimated using a combined t-RFLP fingerprinting and high throughput sequencing approach. The t-RFLP analysis revealed desert communities were different from the single non-desert location...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28367229/robust-high-productivity-phototrophic-carbon-capture-at-high-ph-and-alkalinity-using-natural-microbial-communities
#13
Christine E Sharp, Sydney Urschel, Xiaoli Dong, Allyson L Brady, Greg F Slater, Marc Strous
BACKGROUND: Bioenergy with carbon capture and storage (BECCS) has come to be seen as one of the most viable technologies to provide the negative carbon dioxide emissions needed to constrain global temperatures. In practice, algal biotechnology is the only form of BECCS that could be realized at scale without compromising food production. Current axenic algae cultivation systems lack robustness, are expensive and generally have marginal energy returns. RESULTS: Here it is shown that microbial communities sampled from alkaline soda lakes, grown as biofilms at high pH (up to 10) and high alkalinity (up to 0...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28341397/degradation-of-textile-dyes-by-cyanobacteria
#14
Priscila Maria Dellamatrice, Maria Estela Silva-Stenico, Luiz Alberto Beraldo de Moraes, Marli Fátima Fiore, Regina Teresa Rosim Monteiro
Dyes are recalcitrant compounds that resist conventional biological treatments. The degradation of three textile dyes (Indigo, RBBR and Sulphur Black), and the dye-containing liquid effluent and solid waste from the Municipal Treatment Station, Americana, São Paulo, Brazil, by the cyanobacteria Anabaena flos-aquae UTCC64, Phormidium autumnale UTEX1580 and Synechococcus sp. PCC7942 was evaluated. The dye degradation efficiency of the cyanobacteria was compared with anaerobic and anaerobic-aerobic systems in terms of discolouration and toxicity evaluations...
January 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28138721/cyanobacterial-contribution-to-travertine-deposition-in-the-hoyoux-river-system-belgium
#15
Julia Kleinteich, Stjepko Golubic, Igor S Pessi, David Velázquez, Jean-Yves Storme, François Darchambeau, Alberto V Borges, Philippe Compère, Gudrun Radtke, Seong-Joo Lee, Emmanuelle J Javaux, Annick Wilmotte
Travertine deposition is a landscape-forming process, usually building a series of calcareous barriers differentiating the river flow into a series of cascades and ponds. The process of carbonate precipitation is a complex relationship between biogenic and abiotic causative agents, involving adapted microbial assemblages but also requiring high levels of carbonate saturation, spontaneous degassing of carbon dioxide and slightly alkaline pH. We have analysed calcareous crusts and water chemistry from four sampling sites along the Hoyoux River and its Triffoy tributary (Belgium) in winter, spring, summer and autumn 2014...
July 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28073542/the-rise-of-toxic-benthic-phormidium-proliferations-a-review-of-their-taxonomy-distribution-toxin-content-and-factors-regulating-prevalence-and-increased-severity
#16
REVIEW
Tara G McAllister, Susanna A Wood, Ian Hawes
There has been a marked increase in the distribution, intensity and frequency of proliferations of some species of the benthic mat-forming, toxin-producing genus Phormidium in rivers globally over the last decade. This review summarises current knowledge on their taxonomy, distribution, toxin content, environmental drivers of proliferations, and monitoring and management strategies in New Zealand. Although toxic Phormidium proliferation occurs in rivers worldwide little is known about these factors in most countries...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28004519/antimicrobial-assay-and-genetic-screening-of-selected-freshwater-cyanobacteria-and-identification-of-a-biomolecule-dihydro-2h-pyran-2-one-derivative
#17
A Srivastava, V K Singh, S Patnaik, J Tripathi, P Singh, G Nath, R K Asthana
AIMS: Explorations of freshwater Cyanobacteria as antimicrobial (bacteria, fungi and methicillin-resistant Staphylococcus aureus (MRSA) strains) drug resource using bioassay, NRPS (non-ribosomal polypeptide synthetase) and PKS (polyketide synthase) genes, as well as in silico approach. METHODS AND RESULTS: We have bioassayed the extracts of Phormidium CCC727, Geitlerinema CCC728, Arthrospira CCC729, Leptolyngbya CCC732, Phormidium CCC730, Phormidium CCC731 against six pathogenic bacteria comprising Gram (+ve): S...
April 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27725810/niche-filtering-of-bacteria-in-soil-and-rock-habitats-of-the-colorado-plateau-desert-utah-usa
#18
Kevin C Lee, Stephen D J Archer, Rachel H Boyle, Donnabella C Lacap-Bugler, Jayne Belnap, Stephen B Pointing
A common feature of microbial colonization in deserts is biological soil crusts (BSCs), and these comprise a complex community dominated by Cyanobacteria. Rock substrates, particularly sandstone, are also colonized by microbial communities. These are separated by bare sandy soil that also supports microbial colonization. Here we report a high-throughput sequencing study of BSC and cryptoendolith plus adjacent bare soil communities in the Colorado Plateau Desert, Utah, USA. Bare soils supported a community with low levels of recoverable DNA and high evenness, whilst BSC yielded relatively high recoverable DNA, and reduced evenness compared to bare soil due to specialized crust taxa...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27671809/groundwater-shapes-sediment-biogeochemistry-and-microbial-diversity-in-a-submerged-great-lake-sinkhole
#19
L E Kinsman-Costello, C S Sheik, N D Sheldon, G Allen Burton, D M Costello, D Marcus, P A Den Uyl, G J Dick
For a large part of earth's history, cyanobacterial mats thrived in low-oxygen conditions, yet our understanding of their ecological functioning is limited. Extant cyanobacterial mats provide windows into the putative functioning of ancient ecosystems, and they continue to mediate biogeochemical transformations and nutrient transport across the sediment-water interface in modern ecosystems. The structure and function of benthic mats are shaped by biogeochemical processes in underlying sediments. A modern cyanobacterial mat system in a submerged sinkhole of Lake Huron (LH) provides a unique opportunity to explore such sediment-mat interactions...
March 2017: Geobiology
https://www.readbyqxmd.com/read/27506027/-community-structure-characteristics-of-diatom-in-reservoirs-located-in-the-south-of-jiangsu-province-china-and-its-control-factors
#20
Jie Ren, Tao Zhou, Guang-wei Zhu, Ying-wei Jin, Yang Cui, Hai Xu, Meng-yuan Zhu, Ming-fang Xia, Wei-min Chen
In order to understand the community structure characteristics of Bacillariophyta and its controlling factors in reservoirs located in the Southeast, China, in the geographic background of hills landscape and humid climate, 18 reservoirs were investigated in June, 2015, during the period with high risk of diatom bloom, covering water quality, and the community structures of phytoplankton. The correlations between Bacillariophyta and other planktons with nutrients, water depth, storage capacity, etc. were analyzed...
May 15, 2016: Huan Jing Ke Xue= Huanjing Kexue
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