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https://www.readbyqxmd.com/read/28721624/on-the-successful-use-of-a-simplified-model-to-simulate-the-succession-of-toxic-cyanobacteria-in-a-hypereutrophic-reservoir-with-a-highly-fluctuating-water-level
#1
Ali Fadel, Bruno J Lemaire, Brigitte Vinçon-Leite, Ali Atoui, Kamal Slim, Bruno Tassin
Many freshwater bodies worldwide that suffer from harmful algal blooms would benefit for their management from a simple ecological model that requires few field data, e.g. for early warning systems. Beyond a certain degree, adding processes to ecological models can reduce model predictive capabilities. In this work, we assess whether a simple ecological model without nutrients is able to describe the succession of cyanobacterial blooms of different species in a hypereutrophic reservoir and help understand the factors that determine these blooms...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721505/distinct-bloom-dynamics-of-toxic-and-non-toxic-microcystis-cyanobacteria-subpopulations-in-hoedong-reservoir-korea
#2
Bum Soo Park, Zhun Li, Yoon-Ho Kang, Hyeon Ho Shin, Jae-Hyoung Joo, Myung-Soo Han
Despite the importance of understanding the bloom mechanisms that influence cyanobacterial toxin production, the dynamics of toxic Microcystis subpopulations are largely unknown. Here, we quantified both toxic and entire (i.e., toxic and non-toxic) Microcystis populations based on the microcystin synthetase E (mcyE) and 16S ribosomal RNA genes. Samples were collected from pelagic water and sediments twice per week from October to December 2011, and we investigated the effects of physicochemical factors (pH, water temperature, dissolved oxygen, nutrients, etc...
July 19, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28720699/cellular-trade-offs-and-optimal-resource-allocation-during-cyanobacterial-diurnal-growth
#3
Alexandra-M Reimers, Henning Knoop, Alexander Bockmayr, Ralf Steuer
Cyanobacteria are an integral part of Earth's biogeochemical cycles and a promising resource for the synthesis of renewable bioproducts from atmospheric CO2 Growth and metabolism of cyanobacteria are inherently tied to the diurnal rhythm of light availability. As yet, however, insight into the stoichiometric and energetic constraints of cyanobacterial diurnal growth is limited. Here, we develop a computational framework to investigate the optimal allocation of cellular resources during diurnal phototrophic growth using a genome-scale metabolic reconstruction of the cyanobacterium Synechococcus elongatus PCC 7942...
July 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28718766/structural-insights-into-the-light-driven-auto-assembly-process-of-the-water-oxidizing-mn4cao5-cluster-in-photosystem-ii
#4
Miao Zhang, Martin Bommer, Ruchira Chatterjee, Rana Hussein, Junko Yano, Holger Dau, Jan Kern, Holger Dobbek, Athina Zouni
In plants, algae and cyanobacteria, Photosystem II (PSII) catalyzes the light-driven splitting of water at a protein-bound Mn4CaO5-cluster, the water-oxidizing complex (WOC). In the photosynthetic organisms, the light-driven formation of the WOC from dissolved metal ions is a key process because it is essential in both initial activation and continuous repair of PSII. Structural information is required for understanding of this chaperone-free metal-cluster assembly. For the first time, we obtained a structure of PSII from Thermosynechococcus elongatus without the Mn4CaO5-cluster...
July 18, 2017: ELife
https://www.readbyqxmd.com/read/28718632/systematic-approaches-to-efficiently-produce-2-3-butanediol-in-a-marine-cyanobacterium
#5
Nicole E Nozzi, Anna E Case, Austin L Carroll, Shota Atsumi
Cyanobacteria have attracted significant interest as a platform for renewable production of fuel and feedstock chemicals from abundant atmospheric carbon dioxide by way of photosynthesis. While great strides have been made in developing this technology in freshwater cyanobacteria, logistical issues remain in scale-up. Use of the cyanobacterium Synechococcus sp. PCC 7002 (7002) as a chemical production chassis could address a number of these issues given the higher tolerance to salt, light, and heat as well as the fast growth rate of 7002 in comparison to traditional model cyanobacteria such as Synechococcus elongatus PCC 7942 and Synechocystis sp...
July 18, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28714921/accumulation-of-microcystin-lr-rr-and-yr-in-three-freshwater-bivalves-in-microcystis-aeruginosa-bloom-using-dual-isotope-tracer
#6
Min-Seob Kim, Yeon-Jung Lee, Sun-Yong Ha, Baik-Ho Kim, Soon-Jin Hwang, Jung-Taek Kwon, Jong-Woo Choi, Kyung-Hoon Shin
Abstract: Stable isotope tracers were first applied to evaluate the Microcystis cell assimilation efficiency of Sinanodonta bivalves, since the past identification method has been limited to tracking the changes of each chl-a, clearity, and nutrient. The toxicity profile and accumulation of MC-LR, -RR and -YR in different organs (foot and digestive organs) from the three filter-feeders (Sinanodonta woodina, Sinanodonta arcaeformis, and Unio douglasiae) were assessed under the condition of toxigenic cyanobacteria (Microcystis aeruginosa) blooms through an in situ pond experiment using (13)C and (15)N dual isotope tracers...
July 17, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28713360/cyanobacterial-diversity-in-microbial-mats-from-the-hypersaline-lagoon-system-of-araruama-brazil-an-in-depth-polyphasic-study
#7
Vitor M C Ramos, Raquel Castelo-Branco, Pedro N Leão, Joana Martins, Sinda Carvalhal-Gomes, Frederico Sobrinho da Silva, João G Mendonça Filho, Vitor M Vasconcelos
Microbial mats are complex, micro-scale ecosystems that can be found in a wide range of environments. In the top layer of photosynthetic mats from hypersaline environments, a large diversity of cyanobacteria typically predominates. With the aim of strengthening the knowledge on the cyanobacterial diversity present in the coastal lagoon system of Araruama (state of Rio de Janeiro, Brazil), we have characterized three mat samples by means of a polyphasic approach. We have used morphological and molecular data obtained by culture-dependent and -independent methods...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28711348/impact-of-molecular-flexibility-on-the-site-energy-shift-of-chlorophylls-in-photosystem-ii
#8
Daniele Narzi, Emanuele Coccia, Marco Manzoli, Leonardo Guidoni
Light harvesting from the Sun by antenna complexes surrounding the reaction center of Photosystem II represents the first step of the natural oxygenic photosynthesis performed by plants, algae and cyanobacteria. The excitation energy derived from the sunlight is absorbed by the chlorophylls of the antenna and subsequently conveyed to the reaction center of Photosystem II through resonant energy transfer mechanisms. In the special pair of chlorophylls of the reaction center the charge separation occurs, eventually leading to the oxidation of water molecules into protons, electrons and molecular oxygen...
July 8, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28711288/performance-and-bacterial-community-structure-of-a-10-years-old-constructed-mangrove-wetland
#9
Tingting Tian, Nora F Y Tam, Qijie Zan, S G Cheung, Paul K S Shin, Y S Wong, Li Zhang, Zhanghe Chen
Constructed mangrove wetland has been used for wastewater treatment but its long-term performance has not been reported. One-year monitoring of a 10-years old horizontal subsurface-flow constructed mangrove wetland consisting of three belts, two with mangrove plants and one without, revealed that the system maintained high and stable removal percentages of organic matter and nutrients, and planted belts performed better than unplanted control. Substrates in belts planted with Aegiceras corniculatum or Kandelia obovata had higher abundance of ammonifiers, nitrifiers and denitrifiers but lower total heterotrophic bacteria than unplanted substrate...
July 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28710587/characterization-of-the-sulfur-formation-suf-genes-in-synechocystis-sp-pcc-6803-under-photoautotrophic-and-heterotrophic-growth-conditions
#10
Sha-Sha Zang, Hai-Bo Jiang, Wei-Yu Song, Min Chen, Bao-Sheng Qiu
The sulfur-formation ( suf ) genes play important roles in both photosynthesis and respiration of cyanobacteria, but the organism prioritizes Fe-S clusters for respiration at the expense of photosynthesis. Iron-sulfur (Fe-S) clusters are important to all living organisms, but their assembly mechanism is poorly understood in photosynthetic organisms. Unlike non-photosynthetic bacteria that rely on the iron-sulfur cluster system, Synechocystis sp. PCC 6803 uses the Sulfur-Formation (SUF) system as its major Fe-S cluster assembly pathway...
July 14, 2017: Planta
https://www.readbyqxmd.com/read/28710405/the-effect-of-oxygen-concentration-and-temperature-on-nitrogenase-activity-in-the-heterocystous-cyanobacterium-fischerella-sp
#11
Lucas J Stal
Heterocysts are differentiated cells formed by some filamentous, diazotrophic (dinitrogen-fixing) cyanobacteria. The heterocyst is the site of dinitrogen fixation providing the oxygen-sensitive nitrogenase with a low-oxygen environment. The diffusion of air into the heterocyst is a compromise between the maximum influx of dinitrogen gas while oxygen is kept sufficiently low to allow nitrogenase activity. This investigation tested the hypothesis that the heterocyst is capable of controlling the influx of air...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709850/removal-of-microcystins-in-water-by-ultrasound-coupled-advanced-oxidation-techniques
#12
Gökçe Tezcanlı Güyer, Fjolle Kabashi
Microcystis Aeruginosa, is one of the typical toxin producing cyanobacteria, has increased attention for immediate removal due to toxin release, which has adverse effects both in the environment and humans. In this study, suspensions of Microcystis Aeruginosa were sonicated at the following frequencies 582kHz (0,055W/mL), 861kHz (0,094W/mL) and 1136kHz (0,060W/mL) for 60min. The study examined the removal of intracellular microcystin (intra MC-LR) and extracellular microcystin (extra MC-LR) release during sonication...
May 4, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28709074/increased-methane-production-in-cyanobacteria-and-methanogenic-microbe-co-cultures
#13
Tracey Yeung, Matthew Kwan, Lewis Adler, Toby J Mills, Brett A Neilan, Gavin Conibeer, Robert Patterson
A novel light-to-bioenergy system produced 3.5 times the baseline methane output using a co-culture of cyanobacteria (Oscillatoria sp.) and a methanogenic microbial community. Analysis of micronutrients in the system during the growth phase indicated that cobalt, iron, nickel and zinc were not appreciably consumed. The stable consumption and return of macronutrients calcium and magnesium were also observed. Essential macronutrients nitrogen, in the form of nitrate, and phosphorus showed no cycling during the growth phase and were depleted at rates of 0...
June 24, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28708310/omics-prediction-of-bioactive-peptides-from-the-edible-cyanobacterium-arthrospira-platensis-proteome
#14
Chaofan Ji, Jing Han, Jingbo Zhang, Jing Hu, Yinghuan Fu, Hang Qi, Yue Sun, Chenxu Yu
BACKGROUND: Bioinformatics approaches are widely used to evaluate the prospects of the novel protein sources in bioactive peptide research. The edible cyanobacteria are considered as the potential protein precursors. However, the abundance of unicellular cyanobacterial proteins is largely unknown and highly dynamic according to the cultivation conditions, which need to be considered in this research field. The objective of this work was to evaluate the protein abundance of Arthrospira platensis, as well as to map the bioactive peptide sequences from the high abundance proteins of the A...
July 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28707658/-phototrophic-microorganisms-in-the-symbiotic-communities-of-baikal-sponges-diversity-of-psba-gene-encoding-d1-protein-of-photosystem-ii-sequences
#15
O V Kaluzhnaya, V B Itskovich
The psbA gene, which encodes a major photosystem II protein (protein II or D1), is a marker for the presence of phototrophic organisms in water communities. We have pioneered the use of this marker for studying the diversity of phototrophic microflora of freshwater invertebrates. The object of the study is the microbial associations accompanying the endemic Baikal sponge Baikalospongia intermedia and the surrounding aquatic microbial community. Analysis of the psbA gene sequences in the examined microbiomes demonstrates the presence of various phototrophic groups, such as Cyanobacteria, Chlorophyta, Heterokonta, Haptophyta, and Ochrophyta algae, as well as cyanophages...
May 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28705760/synthetic-analogues-of-cyanobacterial-alkaloid-cylindrospermopsin-and-their-toxicological-activity
#16
Christopher Cartmell, Daniel M Evans, Jessica M L Elwood, Hisham S Fituri, Patrick J Murphy, Thomas Caspari, Barbara Poniedziałek, Piotr Rzymski
Cylindrospermopsin (CYN) is a naturally occurring alkaloid produced by a variety of cyanobacteria and known to induce oxidative stress-mediated toxicity in eukaryotic cells. Despite extensive research on the mechanism of CYN toxicity, an understanding of the structural features responsible for this toxicity and the mechanism by which it can enter the cell are still not clear. It was established that the presence of both the uracil and guanidine groups is essential in biological activity of CYN whilst not much is known in this regard on the role of tether that separates them and the attached hydroxyl group...
July 10, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28705596/isolation-and-characterization-of-aerobic-anoxygenic-phototrophs-from-exposed-soils-from-the-s%C3%A3-r-rondane-mountains-east-antarctica
#17
Guillaume Tahon, Anne Willems
This study investigated the culturable aerobic phototrophic bacteria present in soil samples collected in the proximity of the Belgian Princess Elisabeth Station in the Sør Rondane Mountains, East Antarctica. Until recently, only oxygenic phototrophic bacteria (Cyanobacteria) were well known from Antarctic soils. However, more recent non-cultivation-based studies have demonstrated the presence of anoxygenic phototrophs and, particularly, aerobic anoxygenic phototrophic bacteria in these areas. Approximately 1000 isolates obtained after prolonged incubation under different growth conditions were studied and characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry...
June 27, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28700666/effects-of-kluyveromyces-marxianus-supplementation-on-immune-responses-intestinal-structure-and-microbiota-in-broiler-chickens
#18
Weiwei Wang, Zhui Li, Zengpeng Lv, Beibei Zhang, Hong Lv, Yuming Guo
To investigate the effects of Kluyveromyces marxianus on immune responses, intestinal structure and microbiota in broilers, 840 1-d-old broiler chicks were randomly divided into seven groups (eight replicates) and were fed basal diets without or with 0.25, 0.50, 1.0, 1.5, 2.0, and 2.5 g/kg of K. marxianus (2.0×1010 CFU/g). Serum and intestine samples were collected at 21 d of age. The results showed that increasing K. marxianus addition linearly reduced feed conversion ratio but linearly elevated relative thymus weight, as well as quadratically increased serum lysozyme and IgG levels, with the medium dose (1...
2017: PloS One
https://www.readbyqxmd.com/read/28699965/bacterial-degradation-of-dissolved-organic-matter-released-by-planktothrix-agardhii-cyanobacteria
#19
L P Tessarolli, I L Bagatini, I Bianchini-Jr, A A H Vieira
Although Planktothrix agardhii often produces toxic blooms in eutrophic water bodies around the world, little is known about the fate of the organic matter released by these abundant Cyanobacteria. Thus, this study focused in estimating the bacterial consumption of the DOC and DON (dissolved organic carbon and dissolved organic nitrogen, respectively) produced by axenic P. agardhii cultures and identifying some of the bacterial OTUs (operational taxonomic units) involved in the process. Both P. agardhii and bacterial inocula were sampled from the eutrophic Barra Bonita Reservoir (SP, Brazil)...
July 10, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28699015/sponge-prokaryote-communities-in-taiwanese-coral-reef-and-shallow-hydrothermal-vent-ecosystems
#20
F J R C Coelho, D F R Cleary, N C M Gomes, A R M Pólonia, Y M Huang, L-L Liu, N J de Voogd
Previously, it was believed that the prokaryote communities of typical 'low-microbial abundance' (LMA) or 'non-symbiont harboring' sponges were merely subsets of the prokaryote plankton community. Recent research has, however, shown that these sponges are dominated by particular clades of Proteobacteria or Cyanobacteria. Here, we expand on this research and assess the composition and putative functional profiles of prokaryotic communities from LMA sponges collected in two ecosystems (coral reef and hydrothermal vent) from vicinal islands of Taiwan with distinct physicochemical conditions...
July 11, 2017: Microbial Ecology
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