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Dalel Belhaj, Khaled Athmouni, Mohammad Boshir Ahmed, Nissaf Aoiadni, Abdelfattah El Feki, John L Zhou, Habib Ayadi
The in vitro antioxidant, cytotoxic and cytoprotective properties and in vivo hepatoprotective activities of crude polysaccharides extracted from cyanobacteria Phormidim versicolor NCC466 (CFv-PS) were investigated. The CFv-PS, identified as heteropolysaccharides with molecular weight of 63.79 kDa, exhibited relatively strong antioxidant activity, in a concentration-depended manner, in vitro assays. Additionally, CFv-PS did not induce cytotoxic effect on HepG2 human hepatocellular carcinoma cells within the range of tested concentrations (25-150 μg·mL-1 ) while preventing them against Cd...
February 27, 2018: International Journal of Biological Macromolecules
Yiwen Tao, Pinglin Li, Daojing Zhang, Evgenia Glukhov, Lena Gerwick, Chen Zhang, Thomas F Murray, William H Gerwick
Cancer cell cytotoxicity was used to guide the isolation of nine new swinholide-related compounds, named samholides A-I (1-9), from an American Samoan marine cyanobacterium cf. Phormidium sp. Their structures were determined by extensive analysis of 1D and 2D NMR spectroscopic data. The new compounds share an unusual 20-demethyl 44-membered lactone ring comprised of two monomers, and they demonstrate structural diversity arising from geometric isomerization of double bonds, sugar units with unique glyceryl moieties and varied methylation patterns...
February 19, 2018: Journal of Organic Chemistry
Ekaterina Pushkareva, Igor S Pessi, Zorigto Namsaraev, Marie-Jose Mano, Josef Elster, Annick Wilmotte
Molecular and morphological methods were applied to study cyanobacterial community composition in biological soil crusts (BSCs) from four areas (two nunataks and two ridges) in the Sør Rondane Mountains, Antarctica. The sampling sites serve as control areas for open top chambers (OTCs) that were put in place in 2010 at the time of sample collection and will be compared with BSC samples taken from the OTCs in the future. Cyanobacterial cell biovolume was estimated using epifluorescence microscopy, which revealed the dominance of filamentous cyanobacteria in all studied sites except the Utsteinen ridge, where unicellular cyanobacteria were the most abundant...
February 7, 2018: Systematic and Applied Microbiology
Sevgi Ertuğrul Karatay, Gönül Dönmez, Zümriye Aksu
The use of microbial biomass as biosorbent for phenol removal has been extensively studied, but its removal by biosorption by thermophilic cyanobacterium Phormidium sp. has not been investigated to the best of our knowledge. In the present study, some important parameters for biosorption process were optimized, starting with testing the effects of different pH values ranging from 1 to 12, and then initial phenol concentrations of 45.1, 115.3, 181.4, 243.3, 339.9 mg/L on phenol uptake. The efficiency of removal from aqueous solution was higher within the pH 6-8 range, with the maximum of 100% at pH 7 after 24 hours of adsorption time...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Tiago Ribeiro, Filipa Lemos, Marco Preto, Joana Azevedo, Maria Lígia Sousa, Pedro N Leão, Alexandre Campos, Stig Linder, Rui Vitorino, Vitor Vasconcelos, Ralph Urbatzka
Portoamides are cyclic peptides produced and released by the cyanobacterial strain Phormidium sp. presumably to interfere with other organisms in their ecosystems ("allelopathy"). Portoamides were previously demonstrated to have an antiproliferative effect on human lung carcinoma cells, but the underlying mechanism of this activity has not been described. In the present work, the effects of portoamides on proliferation were examined in eight human cancer cell lines and two non-carcinogenic cell lines, and major differences in sensitivities were observed...
2017: PloS One
Enrique A Cantoral Uriza, Antonia D Asencio, Marina Aboal
Microcystins (MCs) are potent hepatotoxins, and their presence in water bodies poses a threat to wildlife and human populations. Most of the available information refers to plankton, and much less is known about microcystins in other habitats. To broaden our understanding of the presence and environmental distribution of this group of toxins, we conducted extensive sampling throughout Spain, under a range of conditions and in distinct aquatic and terrestrial habitats. More than half of the tested strains were toxic; concentrations of the hepatotoxin were low compared with planktic communities, and the number of toxic variants identified in each sample of the Spanish strains ranged from 1-3...
November 28, 2017: Toxins
James A Bradley, Leslie K Daille, Christopher B Trivedi, Caitlin L Bojanowski, Blake W Stamps, Bradley S Stevenson, Heather S Nunn, Hope A Johnson, Sean J Loyd, William M Berelson, Frank A Corsetti, John R Spear
Ancient putative microbial structures that appear in the rock record commonly serve as evidence of early life on Earth, but the details of their formation remain unclear. The study of modern microbial mat structures can help inform the properties of their ancient counterparts, but modern mineralizing mat systems with morphological similarity to ancient structures are rare. Here, we characterize partially lithified microbial mats containing cm-scale dendrolitic coniform structures from a geothermal pool ("Cone Pool") at Little Hot Creek, California, that if fully lithified, would resemble ancient dendrolitic structures known from the rock record...
2017: NPJ Biofilms and Microbiomes
Tunay Karan, Ramazan Erenler
Background: Cyanobacteria, including pharmaceutically and medicinally valuable compounds attract the great attention lately. Norharmane (9H-pyrido (3,4-b) indole found in some cyanobacteria revealed a great number of biological effects. Objective: Seven cyanobacteria were isolated and identified from Yesilirmak River and Gaziosmanpasa University Campus to determine the norharmane content. Materials and Methods: Cyanobacteria collected from Tokat, Turkey were isolated and identified by morphologically...
October 2017: Pharmacognosy Magazine
Rakesh Mogul, Parag Vaishampayan, Mina Bashir, Chris P McKay, Keith Schubert, Rosalba Bornaccorsi, Ernesto Gomez, Sneha Tharayil, Geoffrey Payton, Juliana Capra, Jessica Andaya, Leonard Bacon, Emily Bargoma, David Black, Katie Boos, Michaela Brant, Michael Chabot, Danny Chau, Jessica Cisneros, Geoff Chu, Jane Curnutt, Jessica DiMizio, Christian Engelbrecht, Caroline Gott, Raechel Harnoto, Ruben Hovanesian, Shane Johnson, Britne Lavergne, Gabriel Martinez, Paul Mans, Ernesto Morales, Alex Oei, Gary Peplow, Ryan Piaget, Nicole Ponce, Eduardo Renteria, Veronica Rodriguez, Joseph Rodriguez, Monica Santander, Khamille Sarmiento, Allison Scheppelmann, Gavin Schroter, Devan Sexton, Jenin Stephenson, Kristin Symer, Tatiane Russo-Tait, Bill Weigel, Mary B Wilhelm
In this study, we expand upon the biogeography of biological soil crusts (BSCs) and provide molecular insights into the microbial community and biochemical dynamics along the vertical BSC column structure, and across a transect of increasing BSC surface coverage in the central Mojave Desert, CA, United States. Next generation sequencing reveals a bacterial community profile that is distinct among BSCs in the southwestern United States. Distribution of major phyla in the BSC topsoils included Cyanobacteria (33 ± 8%), Proteobacteria (26 ± 6%), and Chloroflexi (12 ± 4%), with Phormidium being the numerically dominant genus...
2017: Frontiers in Microbiology
Cindrella Das, Nagappa Ramaiah, Elroy Pereira, K Naseera
This study evaluated the bioremediation potential of two marine microalgae Chlorella sp. and Phormidium sp., both individually and in consortium, to reduce various pollutants in tannery wastewater (TW). The microalgae were grown in hazardous 100% TW for 20 days, and the reductions in biochemical oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen (TN), total phosphorous (TP), chromium (Cr) and total dissolved solids (TDS) of the wastewater monitored periodically. Both marine isolates reduced the BOD and COD by ≥90% in the consortium and by over 80% individually...
October 20, 2017: International Journal of Phytoremediation
Susanna A Wood, Jonathan Puddick
The prevalence of benthic proliferations of the anatoxin-producing cyanobacterium Phormidium are increasing in cobble-bed rivers worldwide. Studies to date have shown high spatial and temporal variability in anatoxin concentrations among mats. In this study we determined anatoxin quotas (toxins per cell) in field samples and compared these results to the conventionally-used concentrations (assessed per dry weight of mat). Three mats were selected at sites in two rivers and were sampled every 2-3 h for 24-26 h...
October 11, 2017: Marine Drugs
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
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
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
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...
January 15, 2018: Science of the Total Environment
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...
November 2017: Molecular Phylogenetics and Evolution
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
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
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
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...
October 2017: Ecotoxicology and Environmental Safety
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