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https://www.readbyqxmd.com/read/28920683/fate-of-flumioxazin-in-aquatic-plants-two-algae-pseudokirchneriella-subcapitata-synechococcus-sp-duckweed-lemna-sp-and-water-milfoil-myriophyllum-elatinoides
#1
Daisuke Ando, Takuo Fujisawa, Toshiyuki Katagi
Flumioxazin separately 14C-labeled at 1,2-positions of the tetrahydrophthalimide moiety or uniformly labeled at the phenyl ring was exposed to two algae and duckweed via water-layer, and water milfoil via water-layer or bottom-sediment for 14 days to investigate uptake and metabolic profiles in these aquatic plants. While 14C-Flumioxazin received immediate hydrolysis through maleimide ring opening and amide bond cleavage with its hydrolytic half-life of <1 day in both water and sediment, the 14C-plant uptake was ≤4...
September 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28916964/presence-of-a-3fe-4s-cluster-in-a-psac-variant-as-a-functional-component-of-the-photosystem-i-electron-transfer-chain-in-synechococcus-sp-pcc-7002
#2
Adam A Pérez, Bryan H Ferlez, Amanda M Applegate, Karim Walters, Zhihui He, Gaozhong Shen, John H Golbeck, Donald A Bryant
A site-directed C14G mutation was introduced into the stromal PsaC subunit of Synechococcus sp. strain PCC 7002 in vivo in order to introduce an exchangeable coordination site into the terminal FB [4Fe-4S] cluster of Photosystem I (PSI). Using an engineered PSI-less strain (psaAB deletion), psaC was deleted and replaced with recombinant versions controlled by a strong promoter, and the psaAB deletion was complemented. Modified PSI accumulated at lower levels in this strain and supported slower photoautotrophic growth than wild type...
September 15, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28915336/the-microbiome-associated-with-two-synechococcus-ribotypes-at-different-levels-of-ecological-interaction
#3
Cristiana Callieri, Stefano Amalfitano, Gianluca Corno, Andrea Di Cesare, Roberto Bertoni, Ester Eckert
Planktonic cyanobacteria belonging to the genus Synechococcus are ubiquitously distributed in marine and fresh waters, substantially contributing to total carbon fixation on a global scale. While their ecological relevance is acknowledged, increasing resolution in molecular techniques allows disentangling cyanobacteria's role at the micro-scale, where complex microbial interactions may drive the overall community assembly. The interplay between phylogenetically different Synechococcus clades and their associated bacterial communities can affect their ecological fate and susceptibility to protistan predation...
September 15, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28898827/purification-and-antioxidant-activity-of-phycocyanin-from-synechococcus-sp-r42dm-isolated-from-industrially-polluted-site
#4
Ravi R Sonani, Stuti Patel, Bela Bhastana, Kinnari Jakharia, Mukesh G Chaubey, Niraj K Singh, Datta Madamwar
The cyanobacterium Synechococcus sp. R42DM, isolated from an industrially polluted site Vatva, Gujarat, India was recognized to produce phycocyanin (PC) as major phycobiliprotein. In present study, the combinatorial approach of chemical and physical methods i.e. Triton-X 100 treatment and ultra-sonication was designed for extraction of PC. From cell extract, the intact and functional-PC was purified up to purity 4.03 by ammonium sulphate fractionation and ion-exchange chromatography. The PC displayed considerable in vitro antioxidant and radical-scavenging activity...
August 31, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28895022/subcellular-pigment-distribution-is-altered-under-far-red-light-acclimation-in-cyanobacteria-that-contain-chlorophyll-f
#5
Erica L-W Majumder, Benjamin M Wolf, Haijun Liu, R Howard Berg, Jerilyn A Timlin, Min Chen, Robert E Blankenship
Far-Red Light (FRL) acclimation is a process that has been observed in cyanobacteria and algae that can grow solely on light above 700 nm. The acclimation to FRL results in rearrangement and synthesis of new pigments and pigment-protein complexes. In this study, cyanobacteria containing chlorophyll f, Synechococcus sp. PCC 7335 and Halomicronema hongdechloris, were imaged as live cells with confocal microscopy. H. hongdechloris was further studied with hyperspectral confocal fluorescence microscopy (HCFM) and freeze-substituted thin-section transmission electron microscopy (TEM)...
September 11, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28887169/in-vitro-and-in-vivo-exploration-of-palmitic-acid-from-synechococcus-elongatus-as-an-antibiofilm-agent-on-the-survival-of-artemia-franciscana-against-virulent-vibrios
#6
Sivasubramanian Santhakumari, Nizam Mohamed Nilofernisha, Jeyaraj Godfred Ponraj, Shunmugiah Karutha Pandian, Arumugam Veera Ravi
Biofilm formation of Vibrio spp. has been demonstrated as a potentially important mechanism contributing antibiotic treatment failure in aquaculture. In the present study, the effect of palmitic acid (PA) identified from Synechococcus elongatus was assessed for the inhibition of quorum sensing (QS) regulated biofilm formation in aquatic bacterial pathogens. The biofilm inhibitory concentration (BIC) of PA against Vibrio spp. was found to be 100µgml(-1). In this concentration, PA exhibited a significant inhibition in biofilm biomass of Vibrio harveyi MTCC 3438, V...
September 6, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28886916/annual-variations-of-total-and-fractionated-chlorophyll-and-phytoplankton-groups-in-the-gulf-of-cadiz
#7
C González-García, J Forja, M C González-Cabrera, M P Jiménez, L M Lubián
Chlorophyll and phytoplankton distribution and concentration in the Gulf of Cadiz were studied during 2014 and 2015. In both years the highest chlorophyll concentrations are found at coastal stations during spring. Pico- and nanophytoplankton are the main contributors to total chlorophyll, with highest concentrations at the outer limit of the continental shelf. Microphytoplankton is responsible for most of the inshore chlorophyll. Picophytoplankton was analyzed to determine density, biomass and distribution...
September 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28828261/aura-biomes-are-present-in-the-water-layer-above-coral-reef-benthic-macro-organisms
#8
Kevin Walsh, J Matthew Haggerty, Michael P Doane, John J Hansen, Megan M Morris, Ana Paula B Moreira, Louisi de Oliveira, Luciana Leomil, Gizele D Garcia, Fabiano Thompson, Elizabeth A Dinsdale
As coral reef habitats decline worldwide, some reefs are transitioning from coral- to algal-dominated benthos with the exact cause for this shift remaining elusive. Increases in the abundance of microbes in the water column has been correlated with an increase in coral disease and reduction in coral cover. Here we investigated how multiple reef organisms influence microbial communities in the surrounding water column. Our study consisted of a field assessment of microbial communities above replicate patches dominated by a single macro-organism...
2017: PeerJ
https://www.readbyqxmd.com/read/28814973/photoautotrophic-production-of-polyhydroxyalkanoates-in-a-synthetic-mixed-culture-of-synechococcus-elongatus-cscb-and-pseudomonas-putida-cscab
#9
Hannes Löwe, Karina Hobmeier, Manuel Moos, Andreas Kremling, Katharina Pflüger-Grau
BACKGROUND: One of the major challenges for the present and future generations is to find suitable substitutes for the fossil resources we rely on today. Cyanobacterial carbohydrates have been discussed as an emerging renewable feedstock in industrial biotechnology for the production of fuels and chemicals, showing promising production rates when compared to crop-based feedstock. However, intrinsic capacities of cyanobacteria to produce biotechnological compounds are limited and yields are low...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28803467/not-gate-genetic-circuits-to-control-gene-expression-in-cyanobacteria
#10
Arnaud Taton, Amy T Ma, Mizuho Ota, Susan Golden, James W Golden
To downregulate gene expression in cyanobacteria, we constructed NOT gate genetic circuits using orthogonal promoters and their cognate repressors regulated translationally by synthetic riboswitches. Four NOT gates were tested and characterized in five cyanobacterial strains using fluorescent reporter-gene assays. In comparison to alternative systems used to downregulate gene expression in cyanobacteria, these NOT gates performed well, reducing YFP reporter expression by 4 to 50-fold. We further evaluated these NOT gates by controlling the expression of the ftsZ gene, which encodes a prokaryotic tubulin homolog that is required for cell division and is essential for Synechococcus elongatus PCC 7942...
August 14, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28794262/super-resolution-microscopy-of-the-%C3%A3-carboxysome-reveals-a-homogenous-matrix
#11
Matthew J Niederhuber, Talley J Lambert, Clarence Yapp, Pamela A Silver, Jessica K Polka
Carbon fixation in cyanobacteria makes a major contribution to the global carbon cycle. The cyanobacterial carboxysome is a proteinaceous microcompartment that protects and concentrates the carbon-fixing enzyme RuBisCO in a paracrystalline lattice, making it possible for these organisms to fix CO2 from the atmosphere. The protein responsible for the organization of this lattice in beta-type carboxysomes of the freshwater cyanobacterium Synechococcus elongatus, CcmM, occurs in two isoforms thought to localize differentially within the carboxysome matrix...
August 9, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28790992/the-cyanobacteria-dominated-sponge-dactylospongia-elegans-in-the-south-china-sea-prokaryotic-community-and-metagenomic-insights
#12
Zhao-Ming Gao, Guo-Wei Zhou, Hui Huang, Yong Wang
The South China Sea is a special reservoir of sponges of which prokaryotic communities are less studied. Here, a new record of the sponge Dactylospongia elegans is reported near the coast of Jinqing Island in the South China Sea, and its prokaryotic community is comprehensively investigated. Sponge specimens displayed lower microbial diversity compared with surrounding seawater. At the phylum level, prokaryotic communities were consistently dominated by Proteobacteria, followed by Cyanobacteria, Chloroflexi, Acidobacteria, Actinobacteria, Gemmatimonadetes, Thaumarchaeota, and Poribacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28769912/xanthomonas-citri-minc-oscillates-from-pole-to-pole-to-ensure-proper-cell-division-and-shape
#13
André S G Lorenzoni, Giordanni C Dantas, Tessa Bergsma, Henrique Ferreira, Dirk-Jan Scheffers
Xanthomonas citri (Xac) is the causal agent of citrus canker, a disease that affects citrus crops and causes economic impact worldwide. To further characterize cell division in this plant pathogen, we investigated the role of the protein MinC in cell division, chromosome segregation, and peptidoglycan incorporation by deleting the gene minC using allele exchange. Xac with minC deleted exhibited the classic Δmin phenotype observed in other bacteria deleted for min components: minicells and short filamentation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28762000/production-of-%C3%AF-3-fatty-acids-in-marine-cyanobacterium-synechococcus-sp-strain-nkbg-15041c-via-genetic-engineering
#14
Tomoko Yoshino, Natsumi Kakunaka, Yue Liang, Yasuhito Ito, Yoshiaki Maeda, Tatsuhiro Nomaguchi, Tadashi Matsunaga, Tsuyoshi Tanaka
Omega-3 fatty acids (ω3 FAs) have attracted attention because they have various health benefits for humans. Fish oils are currently major sources of ω3 FAs, but a sustainable supply of ω3 FAs based on fish oils is problematic because of the increasing demand. In this study, the production potential of a genetically engineered marine cyanobacterium, Synechococcus sp. strain NKBG 15041c, was examined as an alternative source of ω3 FAs. A change in fatty acid composition of this cyanobacterium was successfully induced by the expression of a heterologous Δ6-desaturase, and the transformants synthesized stearidonic acid, which the wild type cannot produce...
August 1, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28755724/effects-of-elevated-co2-on-phytoplankton-community-biomass-and-species-composition-during-a-spring-phaeocystis-spp-bloom-in-the-western-english-channel
#15
Matthew Keys, Gavin Tilstone, Helen S Findlay, Claire E Widdicombe, Tracy Lawson
A 21-year time series of phytoplankton community structure was analysed in relation to Phaeocystis spp. to elucidate its contribution to the annual carbon budget at station L4 in the western English Channel (WEC). Between 1993-2014 Phaeocystis spp. contributed ∼4.6% of the annual phytoplankton carbon and during the March - May spring bloom, the mean Phaeocystis spp. biomass constituted 17% with a maximal contribution of 47% in 2001. Upper maximal weekly values above the time series mean ranged from 63 to 82% of the total phytoplankton carbon (∼42-137mg carbon (C)m(-3)) with significant inter-annual variability in Phaeocystis spp...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28751404/microbiomes-of-american-oysters-crassostrea-virginica-harvested-from-two-sites-in-the-chesapeake-bay
#16
Sylvia Ossai, Padmini Ramachandran, Andrea Ottesen, Elizabeth Reed, Angelo DePaola, Salina Parveen
In this study, we used 16S rRNA gene amplicons to describe the bacterial microbiota associated with oysters (Crassostrea virginica) and seawater collected from two sites in the Chesapeake Bay. The dominant bacterial groups included those belonging to the order Pelagibacteraceae, family Enterobacteriaceae, and genus Synechococcus The microbiomes varied among oysters from the same site and between the two sites and months.
July 27, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28745633/determination-of-the-glycogen-content-in-cyanobacteria
#17
Alice De Porcellinis, Niels-Ulrik Frigaard, Yumiko Sakuragi
Cyanobacteria accumulate glycogen as a major intracellular carbon and energy storage during photosynthesis. Recent developments in research have highlighted complex mechanisms of glycogen metabolism, including the diel cycle of biosynthesis and catabolism, redox regulation, and the involvement of non-coding RNA. At the same time, efforts are being made to redirect carbon from glycogen to desirable products in genetically engineered cyanobacteria to enhance product yields. Several methods are used to determine the glycogen contents in cyanobacteria, with variable accuracies and technical complexities...
July 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28744260/pipy-a-member-of-the-conserved-cog0325-family-of-plp-binding-proteins-expands-the-cyanobacterial-nitrogen-regulatory-network
#18
José I Labella, Raquel Cantos, Javier Espinosa, Alicia Forcada-Nadal, Vicente Rubio, Asunción Contreras
Synechococcus elongatus PCC 7942 is a paradigmatic model organism for nitrogen regulation in cyanobacteria. Expression of genes involved in nitrogen assimilation is positively regulated by the 2-oxoglutarate receptor and global transcriptional regulator NtcA. Maximal activation requires the subsequent binding of the co-activator PipX. PII, a protein found in all three domains of life as an integrator of signals of the nitrogen and carbon balance, binds to PipX to counteract NtcA activity at low 2-oxoglutarate levels...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28737704/toxicity-at-the-edge-of-life-a-review-on-cyanobacterial-toxins-from-extreme-environments
#19
REVIEW
Samuel Cirés, María Cristina Casero, Antonio Quesada
Cyanotoxins are secondary metabolites produced by cyanobacteria, of varied chemical nature and toxic effects. Although cyanobacteria thrive in all kinds of ecosystems on Earth even under very harsh conditions, current knowledge on cyanotoxin distribution is almost restricted to freshwaters from temperate latitudes. In this review, we bring to the forefront the presence of cyanotoxins in extreme environments. Cyanotoxins have been reported especially in polar deserts (both from the Arctic and Antarctica) and alkaline lakes, but also in hot deserts, hypersaline environments, and hot springs...
July 24, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28732467/minimal-tool-set-for-a-prokaryotic-circadian-clock
#20
Nicolas M Schmelling, Robert Lehmann, Paushali Chaudhury, Christian Beck, Sonja-Verena Albers, Ilka M Axmann, Anika Wiegard
BACKGROUND: Circadian clocks are found in organisms of almost all domains including photosynthetic Cyanobacteria, whereby large diversity exists within the protein components involved. In the model cyanobacterium Synechococcus elongatus PCC 7942 circadian rhythms are driven by a unique KaiABC protein clock, which is embedded in a network of input and output factors. Homologous proteins to the KaiABC clock have been observed in Bacteria and Archaea, where evidence for circadian behavior in these domains is accumulating...
July 21, 2017: BMC Evolutionary Biology
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