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https://www.readbyqxmd.com/read/27725810/niche-filtering-of-bacteria-in-soil-and-rock-habitats-of-the-colorado-plateau-desert-utah-usa
#1
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
#2
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...
September 27, 2016: 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
#3
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
https://www.readbyqxmd.com/read/27474373/growth-of-elaborate-microbial-pinnacles-in-lake-vanda-antarctica
#4
D Y Sumner, A D Jungblut, I Hawes, D T Andersen, T J Mackey, K Wall
Microbial pinnacles in ice-covered Lake Vanda, McMurdo Dry Valleys, Antarctica, extend from the base of the ice to more than 50 m water depth. The distribution of microbial communities, their photosynthetic potential, and pinnacle morphology affects the local accumulation of biomass, which in turn shapes pinnacle morphology. This feedback, plus environmental stability, promotes the growth of elaborate microbial structures. In Lake Vanda, all mats sampled from greater than 10 m water depth contained pinnacles with a gradation in size from <1-mm-tall tufts to pinnacles that were centimeters tall...
November 2016: Geobiology
https://www.readbyqxmd.com/read/27471342/bio-optical-characterization-of-selected-cyanobacteria-strains-present-in-marine-and-freshwater-ecosystems
#5
Bożena Wojtasiewicz, Joanna Stoń-Egiert
The optical properties, i.e., absorption and scattering spectra of ten strains of cyanobacteria from the Baltic Sea and Pomeranian lakes (Aphanizomenon flos-aquae KAC 15, Microcystis aeruginosa CCNP 1101, Anabaena sp. CCNP 1406, Synechocystis salina CCNP 1104, Phormidium sp. CCNP 1317, Nodularia spumigena CCNP 1401, Synechococcus sp. CCNP 1108, Nostoc sp. CCNP 1411, Cyanobacterium sp. CCNP 1105, Pseudanabaena cf. galeata CCNP 1312) grown under low light conditions were investigated. Moreover, the chlorophylls, carotenoids, and phycobilin composition as well as the size structure of chosen cyanobacteria were measured...
2016: Journal of Applied Phycology
https://www.readbyqxmd.com/read/27337877/-temporal-and-spatial-distribution-of-environmental-factors-and-phytoplankton-during-algal-bloom-season-in-pengxi-river-three-gorges-reservoir
#6
Chuan Zhou, Jian-jun Yu, Li Fu, Yu-jie Cui, De-fu Liu, Wei Jiang, Douglas Haffner, Lei Zhang
Planktonic algae and Related Environmental Factors were monitored during the period of algal blooms season in 2014 (Spring April 17 and summer 27 July) in Pengxi river, Three Gorges Reservoir. Mathematical statistical tools were used to analyze the community structure of planktonic algae in Pengxi River with its environmental factors. The results of sampling in spring showed that except the estuary site, S1 and the site close by, S2, the waters stratified, but without epilimnion, only had metalimnion and hypolimnion; the upstream sites had larger temperature difference between water layers than did the downstream ones; from all the 8 sampling sites from estuary to upstream, water depth, and the temperature, pH, conductivity, dissolved oxygen, chlorophyll a, TN and TP of the surface layer (0-0...
March 15, 2016: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/27335008/phycoerythrin-averts-intracellular-ros-generation-and-physiological-functional-decline-in-eukaryotes-under-oxidative-stress
#7
Ravi R Sonani, Rajesh P Rastogi, Niraj K Singh, Jaymesh Thadani, Puja J Patel, Jitendra Kumar, Anand K Tiwari, Ranjitsinh V Devkar, Datta Madamwar
In vitro antioxidant virtue and life-prolonging effect of phycoerythrin (PE; a pigment protein isolated from Phormidium sp. A09DM) have been revealed in our previous reports (Sonani et al. in Age 36:9717, 2014a; Sonani et al. in Process Biochem 49:1757-1766, 2014b). It has been hypothesized that the PE expands life span of Caenorhabditis elegans (bears large resemblance with human aging pathways) due to its antioxidant virtue. This hypothesis is tested in present study by checking the effect of PE on intracellular reactive oxygen species (ROS) generation and associated physiological deformities using mouse and human skin fibroblasts, C...
June 22, 2016: Protoplasma
https://www.readbyqxmd.com/read/27307052/potamolinea-gen-nov-oscillatoriales-cyanobacteria-a-phylogenetically-and-ecologically-coherent-cyanobacterial-genus
#8
Mariéllen Dornelles Martins, Luis Henrique Zanini Branco
Phormidium Kützing ex Gomont, a common genus of the Cyanobacteria, is widely known as a problematic group. Its simple morphology is not congruent with its genetic heterogeneity and several new generic entities have been described based on 16S rRNA gene sequence analyses from populations with similar morphology. During a study of the diversity of Phormidioideae (Phormidiaceae, Oscillatoriales) in Brazil, ten Phormidium-like strains from south-eastern and mid-western regions were isolated in monospecific cultures and submitted to polyphasic evaluation (morphological, ecological and molecular studies)...
September 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27286469/application-of-a-spectrofluorimetric-tool-bbe-benthotorch-for-monitoring-potentially-toxic-benthic-cyanobacteria-in-rivers
#9
Isidora Echenique-Subiabre, Caroline Dalle, Charlotte Duval, Mark W Heath, Alain Couté, Susanna A Wood, Jean-François Humbert, Catherine Quiblier
Over the last decade reports of animal poisoning following accidental consumption of neurotoxin-producing benthic cyanobacteria (mainly Phormidium spp.) have increased. There is a need for rapid and cost-effective tools to survey benthic cyanobacteria. In this study we assessed the performance of the BenthoTorch, a fluorometric probe that provides in situ estimations of cyanobacteria, diatoms and green algae biomass in biofilms. Biofilms (n = 288) were analysed from two rivers in France and eight in New Zealand...
September 15, 2016: Water Research
https://www.readbyqxmd.com/read/27273529/on-the-use-of-high-throughput-sequencing-for-the-study-of-cyanobacterial-diversity-in-antarctic-aquatic-mats
#10
Igor Stelmach Pessi, Pedro De Carvalho Maalouf, Haywood Dail Laughinghouse, Denis Baurain, Annick Wilmotte
The study of Antarctic cyanobacterial diversity has been mostly limited to morphological identification and traditional molecular techniques. High-throughput sequencing (HTS) allows a much better understanding of microbial distribution in the environment, but its application is hampered by several methodological and analytical challenges. In this work, we explored the use of HTS as a tool for the study of cyanobacterial diversity in Antarctic aquatic mats. Our results highlight the importance of using artificial communities to validate the parameters of the bioinformatics procedure used to analyze natural communities, since pipeline-dependent biases had a strong effect on the observed community structures...
June 2016: Journal of Phycology
https://www.readbyqxmd.com/read/27188777/microbial-diversity-and-community-structure-in-an-antimony-rich-tailings-dump
#11
Enzong Xiao, Valdis Krumins, Yiran Dong, Tangfu Xiao, Zengping Ning, Qingxiang Xiao, Weimin Sun
To assess the impact of antimony (Sb) on microbial community structure, 12 samples were taken from an Sb tailings pile in Guizhou Province, Southwest China. All 12 samples exhibited elevated Sb concentrations, but the mobile and bioaccessible fractions were small in comparison to total Sb concentrations. Besides the geochemical analyses, microbial communities inhabiting the tailing samples were characterized to investigate the interplay between the microorganisms and environmental factors in mine tailings. In all samples, Proteobacteria and Actinobacteria were the most dominant phyla...
September 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27088210/potential-of-cyanobacterial-biofilms-in-phosphate-removal-and-biomass-production
#12
Jyoti Rai, Dhananjay Kumar, Lalit K Pandey, Arpana Yadav, J P Gaur
Four cyanobacterial biofilms, raised from cyanobacterial mats and dominated by Phormidium and Oscillatoria spp., were successfully grown attached to polyester mesh discs, and were tested for their probable application in [Formula: see text] -P removal from domestic sewage and other nutrient enriched wastewaters. Biofilm # 2, dominated by Phormidium fragile, best removed [Formula: see text] -P; nevertheless, some of it also grew outside the substrate making harvesting difficult. Other biofilms also efficiently removed [Formula: see text] -P from the medium in the following order: Biofilm # 1 > Biofilm # 3 > Biofilm # 4...
July 15, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27068646/crystal-structure-analysis-of-c-phycoerythrin-from-marine-cyanobacterium-phormidium-sp-a09dm
#13
Vinay Kumar, Ravi R Sonani, Mahima Sharma, Gagan D Gupta, Datta Madamwar
The role of unique sequence features of C-phycoerythrin, isolated from Phormidium sp. A09DM, has been investigated by crystallographic studies. Two conserved indels (i.e. inserts or deletions) are found in the β-subunit of Phormidium phycoerythrin that are distinctive characteristics of large number of cyanobacterial sequences. The identified signatures are a two-residue deletion from position 21 and a nine-residue insertion at position 146. Crystals of Phormidium phycoerythrin were obtained at pH values of 5 and 8...
July 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/26899923/a-polyphasic-taxonomic-approach-in-isolated-strains-of-cyanobacteria-from-thermal-springs-of-greece
#14
Panos Bravakos, Georgios Kotoulas, Katerina Skaraki, Adriani Pantazidou, Athena Economou-Amilli
Strains of Cyanobacteria isolated from mats of 9 thermal springs of Greece have been studied for their taxonomic evaluation. A polyphasic taxonomic approach was employed which included: morphological observations by light microscopy and scanning electron microscopy, maximum parsimony, maximum likelihood and Bayesian analysis of 16S rDNA sequences, secondary structural comparisons of 16S-23S rRNA Internal Transcribed Spacer sequences, and finally environmental data. The 17 cyanobacterial isolates formed a diverse group that contained filamentous, coccoid and heterocytous strains...
May 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/26885760/correction-to-caylobolide-b-a-macrolactone-from-symplostatin-1-producing-marine-cyanobacteria-phormidium-spp-from-florida
#15
Lilibeth A Salvador, Valerie J Paul, Hendrik Luesch
No abstract text is available yet for this article.
February 26, 2016: Journal of Natural Products
https://www.readbyqxmd.com/read/26862139/the-role-of-nitrogen-and-phosphorus-in-regulating-phormidium-sp-cyanobacteria-growth-and-anatoxin-production
#16
Mark Heath, Susie A Wood, Roger G Young, Ken G Ryan
Benthic proliferations of the cyanobacteria Phormidium can cover many kilometres of riverbed. Phormidium can produce neurotoxic anatoxins and ingestion of benthic mats has resulted in numerous animal poisonings in the last decade. Despite this, there is a poor understanding of the environmental factors regulating growth and anatoxin production. In this study, the effects of nitrogen and phosphorus on the growth of two Phormidium strains (anatoxin-producing and non-anatoxin-producing) were examined in batch monocultures...
March 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/26844812/spatial-and-temporal-variation-in-microcystin-occurrence-in-wadeable-streams-in-the-southeastern-united-states
#17
Keith A Loftin, Jimmy M Clark, Celeste A Journey, Dana W Kolpin, Peter C Van Metre, Daren Carlisle, Paul M Bradley
Despite historical observations of potential microcystin-producing cyanobacteria (including Leptolyngbya, Phormidium, Pseudoanabaena, and Anabaena species) in 74% of headwater streams in Alabama, Georgia, South Carolina, and North Carolina (USA) from 1993 to 2011, fluvial cyanotoxin occurrence has not been systematically assessed in the southeastern United States. To begin to address this data gap, a spatial reconnaissance of fluvial microcystin concentrations was conducted in 75 wadeable streams in the Piedmont region (southeastern USA) during June 2014...
September 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/26841797/annual-cycles-of-two-cyanobacterial-mat-communities-in-hydro-terrestrial-habitats-of-the-high-arctic
#18
Daria Tashyreva, Josef Elster
Cyanobacteria form extensive macroscopic mats in shallow freshwater environments in the High Arctic and Antarctic. In these habitats, the communities are exposed to seasonal freezing and desiccation as well as to freeze-thawing and drying-rewetting cycles. Here, we characterized the annual cycles of two Phormidium communities in very shallow seepages located in central Svalbard. We observed the structure of the communities and the morphology, ultrastructure, metabolic activity, and viability of filaments and single cells...
May 2016: Microbial Ecology
https://www.readbyqxmd.com/read/26783637/probing-ph-sensitivity-of-%C3%AE-c-phycoerythrin-and-its-natural-truncant-a-comparative-study
#19
Khalid Anwer, Safikur Rahman, Ravi R Sonani, Faez Iqbal Khan, Asimul Islam, Datta Madamwar, Faizan Ahmad, Md Imtaiyaz Hassan
Cyanobacterial phycoerythrin (αC-PE) from Phormidium tenue exists in two natural forms named as full length (FL-αC-PE) and truncated (Tr-αC-PE). FL-αC-PE and Tr-αC-PE are produced when cyanobacterium is grown in the optimal medium and nutrient deficient medium, respectively. Despite of N-terminal deletion, both proteins show similar spectroscopic properties. In this study, different optical properties of these two natural variants of C-PE were measured in the pH range 1.0-12.0 (1.0 ≤ pH ≤ 12.0). It was observed that: (i) their absorption, fluorescence and CD spectra remain unchanged within the range adjacent to neutral pH, 5...
May 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/26672293/-planktonic-algae-s-distribution-and-correlation-with-dissolved-organic-matters-fluorescence-in-the-end-of-the-three-gorges-reservoir-s-back-water-zone
#20
Lei-lei Fan, Si Li, Dan-ni Yu, Qiang He, Fang-ying Ji, Zhong-yuan Jiang, Zhi-xi Gao, Ke-hou Ao
For researching the community structure, composition, and distribution of the planktonic algae in the Three Gorges Reservoir (TRG), especially, within TRG water levels' fluctuating, mpacting to water quality with the algae's growing, 6 sampling cites in the end of the TGR's back water zone, from Chaotianmen to Taihonggang Town, are chosen to monitor, at the sensitive stages time of algal bloom between March to May 2012, namely, water levels lowing from the highest impounding. The community's structure, composition, and distribution of the planktonic algae in the TGR, and the correlation of water quality parameters and DOM's fluorescence features with algae density, are obtained...
August 2015: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
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