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https://www.readbyqxmd.com/read/28092828/a-flexible-microbial-co-culture-platform-for-simultaneous-utilization-of-methane-and-carbon-dioxide-from-gas-feedstocks
#1
Eric A Hill, William B Chrisler, Alex S Beliaev, Hans C Bernstein
A new co-cultivation technology is presented that converts greenhouse gasses, CH4 and CO2, into microbial biomass. The methanotrophic bacterium, Methylomicrobium alcaliphilum 20z, was coupled to a cyanobacterium, Synechococcus PCC 7002 via oxygenic photosynthesis. The system exhibited robust growth on diverse gas mixtures ranging from biogas to those representative of a natural gas feedstock. A continuous processes was developed on a synthetic natural gas feed that achieved steady-state by imposing coupled light and O2 limitations on the cyanobacterium and methanotroph, respectively...
January 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28089380/biotic-host-pathogen-interactions-as-major-drivers-of-plastid-endosymbiosis
#2
REVIEW
Ugo Cenci, Debashish Bhattacharya, Andreas P M Weber, Christophe Colleoni, Agathe Subtil, Steven G Ball
The plastid originated 1.5 billion years ago through a primary endosymbiosis involving a heterotrophic eukaryote and an ancient cyanobacterium. Phylogenetic and biochemical evidence suggests that the incipient endosymbiont interacted with an obligate intracellular chlamydial pathogen that housed it in an inclusion. This aspect of the ménage-à-trois hypothesis (MATH) posits that Chlamydiales provided critical novel transporters and enzymes secreted by the pathogens in the host cytosol. This initiated the efflux of photosynthate to both the inclusion lumen and host cytosol...
January 11, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28074411/biomass-and-terpenoids-produced-by-mutant-strains-of-arthrospira-under-low-temperature-and-light-conditions
#3
Jian Guan, Songdong Shen, Hao Wu, Xin Liu, Weijie Shen, Yuan He, R Duan
The filamentous Cyanobacterium Arthrospira is commercially produced and is a functional, high-value, health food. We identified 5 low temperature and low light intensity tolerant strains of Arthrospira sp. (GMPA1, GMPA7, GMPB1, GMPC1, and GMPC3) using ethyl methanesulfonate mutagenesis and low temperature screening. The 5 Arthrospira strains grew rapidly below 14 °C, 43.75 μmol photons m(-2) s(-1) and performed breed conservation at 2.5 °C, 8.75 μmol photons m(-2) s(-1). We used morphological identification and molecular genetic analysis to identify GMPA1, GMPA7, GMPB1 and GMPC1 as Arthrospira platensis, while GMPC3 was identified as Arthrospira maxima...
February 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28074036/redox-crisis-underlies-conditional-light-dark-lethality-in-cyanobacterial-mutants-that-lack-the-circadian-regulator-rpaa
#4
Spencer Diamond, Benjamin E Rubin, Ryan K Shultzaberger, You Chen, Chase D Barber, Susan S Golden
Cyanobacteria evolved a robust circadian clock, which has a profound influence on fitness and metabolism under daily light-dark (LD) cycles. In the model cyanobacterium Synechococcus elongatus PCC 7942, a functional clock is not required for diurnal growth, but mutants defective for the response regulator that mediates transcriptional rhythms in the wild-type, regulator of phycobilisome association A (RpaA), cannot be cultured under LD conditions. We found that rpaA-null mutants are inviable after several hours in the dark and compared the metabolomes of wild-type and rpaA-null strains to identify the source of lethality...
January 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28073551/the-common-bloom-forming-cyanobacterium-microcystis-is-prone-to-a-wide-array-of-microbial-antagonists
#5
REVIEW
Jeroen Van Wichelen, Pieter Vanormelingen, Geoffrey A Codd, Wim Vyverman
Many degraded waterbodies around the world are subject to strong proliferations of cyanobacteria - notorious for their toxicity, high biomass build-up and negative impacts on aquatic food webs - the presence of which puts serious limits on the human use of affected water bodies. Cyanobacterial blooms are largely regarded as trophic dead ends since they are a relatively poor food source for zooplankton. As a consequence, their population dynamics are generally attributed to changes in abiotic conditions (bottom-up control)...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073493/abiotic-variables-affect-stx-concentration-in-a-meso-oligotrophic-subtropical-coastal-lake-dominated-by-cylindrospermopsis-raciborskii-cyanophyceae
#6
Débora Monteiro Brentano, Eduardo L Hettwer Giehl, Maurício Mello Petrucio
The cyanobacterium Cylindrospermopsis raciborskii is capable of producing toxins including saxitoxin (STX). Few studies have verified the influence of environmental variables on the production of STX and most have only been studied in the laboratory. The goal of this work was to identify the abiotic variables related to STX concentration in situ. The relationship among STX concentration and the physical variables, nutrients and chlorophyll-a (chl-a) concentration was examined in a meso-oligotrophic subtropical coastal lake dominated by C...
June 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073481/understanding-the-winning-strategies-used-by-the-bloom-forming-cyanobacterium-cylindrospermopsis-raciborskii
#7
REVIEW
Michele A Burford, John Beardall, Anusuya Willis, Philip T Orr, Valeria F Magalhaes, Luciana M Rangel, Sandra M F O E Azevedo, Brett A Neilan
The cyanobacterium Cylindrospermopsis raciborskii is a widespread species increasingly being recorded in freshwater systems around the world. It is of particular concern because strains in some geographic areas are capable of producing toxins with implications for human and animal health. Studies of this species have increased rapidly in the last two decades, especially in the southern hemisphere where toxic strains are prevalent. A clearer picture is emerging of the strategies adopted by this species to bloom and out-compete other species...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073480/a-review-of-the-global-ecology-genomics-and-biogeography-of-the-toxic-cyanobacterium-microcystis-spp
#8
REVIEW
Matthew J Harke, Morgan M Steffen, Christopher J Gobler, Timothy G Otten, Steven W Wilhelm, Susanna A Wood, Hans W Paerl
This review summarizes the present state of knowledge regarding the toxic, bloom-forming cyanobacterium, Microcystis, with a specific focus on its geographic distribution, toxins, genomics, phylogeny, and ecology. A global analysis found documentation suggesting geographic expansion of Microcystis, with recorded blooms in at least 108 countries, 79 of which have also reported the hepatatoxin microcystin. The production of microcystins (originally "Fast-Death Factor") by Microcystis and factors that control synthesis of this toxin are reviewed, as well as the putative ecophysiological roles of this metabolite...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073476/health-impacts-from-cyanobacteria-harmful-algae-blooms-implications-for-the-north-american-great-lakes
#9
REVIEW
Wayne W Carmichael, Gregory L Boyer
Harmful cyanobacterial blooms (cHABs) have significant socioeconomic and ecological costs, which impact drinking water, fisheries, agriculture, tourism, real estate, water quality, food web resilience and habitats, and contribute to anoxia and fish kills. Many of these costs are well described, but in fact are largely unmeasured. Worldwide cHABs can produce toxins (cyanotoxins), which cause acute or chronic health effects in mammals (including humans) and other organisms. There are few attempts to characterize the full health-related effects other than acute incidences, which may go unrecorded...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28069588/diet-quality-determines-lipase-gene-expression-and-lipase-esterase-activity-in-daphnia-pulex
#10
Apostolos-Manuel Koussoroplis, Anke Schwarzenberger, Alexander Wacker
We studied the short- (12 hours) and long-term (144h) response of Daphnia pulex lipases to quality shifts in diets consisting of different mixtures of the green alga Scenedesmus with the cyanobacterium Synechococcus, two species with contrasting lipid compositions. The lipase/esterase activity in both the gut and the body tissues responded fast to the diet shift and increased with higher dietary contributions of Synechococcus When screening the Daphnia genome for TAG lipases, we discovered a large gene-family expansion of these enzymes...
January 9, 2017: Biology Open
https://www.readbyqxmd.com/read/28067772/alternating-current-dielectrophoresis-collection-and-chaining-of-phytoplankton-on-chip-comparison-of-individual-species-and-artificial-communities
#11
COMPARATIVE STUDY
Coralie Siebman, Orlin D Velev, Vera I Slaveykova
The capability of alternating current (AC) dielectrophoresis (DEP) for on-chip capture and chaining of the three species representative of freshwater phytoplankton was evaluated. The effects of the AC field intensity, frequency and duration on the chaining efficiency and chain lengths of green alga Chlamydomonas reinhardtii, cyanobacterium Synechocystis sp. and diatom Cyclotella meneghiniana were characterized systematically. C. reinhardtii showed an increase of the chaining efficiency from 100 Hz to 500 kHz at all field intensities; C...
January 5, 2017: Biosensors
https://www.readbyqxmd.com/read/28064366/increased-heterocyst-frequency-by-patn-disruption-in-anabaena-leads-to-enhanced-photobiological-hydrogen-production-at-high-light-intensity-and-high-cell-density
#12
Hajime Masukawa, Hidehiro Sakurai, Robert P Hausinger, Kazuhito Inoue
The effects of increasing the heterocyst-to-vegetative cell ratio on the nitrogenase-based photobiological hydrogen production by the filamentous heterocyst-forming cyanobacterium Anabaena sp. PCC 7120 were studied. Using the uptake hydrogenase-disrupted mutant (ΔHup) as the parent, a deletion-insertion mutant (PN1) was created in patN, known to be involved in heterocyst pattern formation and leading to multiple singular heterocysts (MSH) in Nostoc punctiforme strain ATCC 29133. The PN1 strain showed heterocyst differentiation but failed to grow in medium free of combined-nitrogen; however, a spontaneous mutant (PN22) was obtained on prolonged incubation of PN1 liquid cultures and was able to grow robustly on N2...
January 7, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28064361/a-fateful-meeting-of-two-phytoplankton-species-chemical-vs-cell-cell-interactions-in-co-cultures-of-the-green-algae-oocystis-marsonii-and-the-cyanobacterium-microcystis-aeruginosa
#13
Susanne Dunker, Julia Althammer, Georg Pohnert, Christian Wilhelm
Massive growth of single species of cyanobacteria is a common phenomenon in many eutrophicated waters worldwide. Allelopathic growth control of phytoplankton species is one suggested mechanism, but still controversially discussed. The fact that the synthesis of biological active compounds requires high energy costs and carbon investment for a single cell in contrast to high dilution rates in natural systems questions the universal validity of allelopathic mechanisms, even more as high concentrations of allelopathic substances are often needed in several experiments to cause biological effects...
January 7, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28062974/heterologous-synthesis-of-geranyllinalool-a-diterpenol-plant-product-in-the-cyanobacterium-synechocystis
#14
Cinzia Formighieri, Anastasios Melis
Cyanobacteria are industrially robust photosynthetic microorganisms that can be genetically programmed to synthesize commodity products for domestic and industrial consumption. In the present work, Synechocystis was endowed with the synthesis of the plant secondary metabolite geranyllinalool, a diterpene alcohol of commercial interest. Total average yields of 360 μg of geranyllinalool per gram of dry cell weight were obtained in the course of a 48-h cultivation period. Geranyllinalool was primarily sequestered inside the transformant cells, corresponding to 60-70% of the total heterologous product, instead of being entirely exuded, as the case is with shorter heterologous terpene hydrocarbons...
January 6, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28058690/functions-of-chromophore-containing-domain-in-the-large-linker-lcm-polypeptide-of-phycobilisome
#15
I V Elanskaya, I A Kononova, E P Lukashev, Y V Bolychevtseva, M F Yanushin, I N Stadnichuk
In the large linker ArcE polypeptide of the phycobilisome (PBS) from the cyanobacterium Synechocystis sp. PCC 6803, the chromophore-containing 26-kDa domain was deleted with consequent disturbance of the main PBS functions. Phycobilisomes in mutant cells staying in contact with photosystem I cannot transfer energy to the photosystem II. Under the bright light conditions, the interaction of PBSs with the photoprotective orange carotenoid protein in the mutant was lost and the implementation of transition states 1 and 2 of the pigment apparatus was significantly reduced...
November 2016: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28055219/integrating-molecular-networking-and-biological-assays-to-target-the-isolation-of-a-cytotoxic-cyclic-octapeptide-samoamide-a-from-an-american-samoan-marine-cyanobacterium
#16
C Benjamin Naman, Ramandeep Rattan, Svetlana E Nikoulina, John Lee, Bailey W Miller, Nathan A Moss, Lorene Armstrong, Paul D Boudreau, Hosana M Debonsi, Frederick A Valeriote, Pieter C Dorrestein, William H Gerwick
Integrating LC-MS/MS molecular networking and bioassay-guided fractionation enabled the targeted isolation of a new and bioactive cyclic octapeptide, samoamide A (1), from a sample of cf. Symploca sp. collected in American Samoa. The structure of 1 was established by detailed 1D and 2D NMR experiments, HRESIMS data, and chemical degradation/chromatographic (e.g., Marfey's analysis) studies. Pure compound 1 was shown to have in vitro cytotoxic activity against several human cancer cell lines in both traditional cell culture and zone inhibition bioassays...
January 5, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28049144/molecular-diffusion-through-cyanobacterial-septal-junctions
#17
Mercedes Nieves-Morión, Conrad W Mullineaux, Enrique Flores
: Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells. In the diazotrophic filament, vegetative cells that fix CO2 through oxygenic photosynthesis provide the heterocysts with reduced carbon and heterocysts provide the vegetative cells with fixed nitrogen. Intercellular molecular transfer has been traced with fluorescent markers, including calcein, 5-carboxyfluorescein, and the sucrose analogue esculin, which are observed to move down their concentration gradient...
January 3, 2017: MBio
https://www.readbyqxmd.com/read/28043868/evaluation-of-anaerobic-digestates-from-different-feedstocks-as-growth-media-for-tetradesmus-obliquus-botryococcus-braunii-phaeodactylum-tricornutum-and-arthrospira-maxima
#18
Marina Massa, Silvia Buono, Antonio Luca Langellotti, Luigi Castaldo, Anna Martello, Antonello Paduano, Raffaele Sacchi, Vincenzo Fogliano
In this paper, two freshwater microalgae (Tetradesmus obliquus and Botryococcus braunii), a marine diatom (Phaeodactylum tricornutum) and a photosynthetic cyanobacterium (Arthrospira maxima) were investigated for their ability to grow on liquid digestates (LDs). Three LDs were obtained from anaerobic digestion of different organic wastes: zootechnical (ZW LD), vegetable biomass (VW LD) and the organic fraction of municipal solid wastes (MW LD). All the strains showed the same growth performance on VW LD as on the respective standard media (SM), while ZW LD was efficient only for growth of T...
December 30, 2016: New Biotechnology
https://www.readbyqxmd.com/read/28028165/genetics-of-the-blue-light-dependent-signal-cascade-that-controls-phototaxis-in-the-cyanobacterium-synechocystis-sp-pcc6803
#19
Yuki Sugimoto, Hiroshi Nakamura, Shukun Ren, Koichi Hori, Shinji Masuda
The Synechocystis sp. PCC6803 can move on a solid surface in response to light, a phenomenon called phototaxis. Although many of the photoreceptors involved in phototaxis have been identified, the mechanisms that regulate directional motility of Synechocystis are not well understood. Previous studies showed that a mutant lacking the blue light-using flavin (BLUF) photoreceptor PixD exhibits negative phototaxis under conditions where wild type responds positively. PixD interacts with the pseudo-response regulator-like protein PixE in a light-dependent manner, suggesting that this intermolecular interaction is important for phototaxis regulation, although genetic evidence has been absent...
December 27, 2016: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28018309/cyanobacteria-in-sulfidic-spring-microbial-mats-can-perform-oxygenic-and-anoxygenic-photosynthesis-simultaneously-during-an-entire-diurnal-period
#20
Judith M Klatt, Dirk de Beer, Stefan Häusler, Lubos Polerecky
We used microsensors to study the regulation of anoxygenic and oxygenic photosynthesis (AP and OP, respectively) by light and sulfide in a cyanobacterium dominating microbial mats from cold sulfidic springs. Both photosynthetic modes were performed simultaneously over all H2S concentrations (1-2200 μM) and irradiances (4-52 μmol photons m(-2) s(-1)) tested. AP increased with H2S concentration while the sum of oxygenic and anoxygenic photosynthetic rates was constant at each light intensity. Thus, the total photosynthetically driven electron transport rate was solely controlled by the irradiance level...
2016: Frontiers in Microbiology
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