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https://www.readbyqxmd.com/read/28806422/silver-nanoparticles-as-a-control-agent-against-facades-coated-by-aerial-algae-a-model-study-of-apatococcus-lobatus-green-algae
#1
Paulina Nowicka-Krawczyk, Joanna Żelazna-Wieczorek, Tomasz Koźlecki
Aerial algae are an important biological factor causing the biodegradation of building materials and facades. Conservation procedures aimed at the protection of historic and utility materials must be properly designed to avoid an increase of the degradation rate. The aim of the present study was to investigate the effect of silver nanoparticles (AgNP) synthetized with features contributing to the accessibility and toxicity (spherical shape, small size) on the most frequently occurring species of green algae in aerial biofilms and thus, the most common biodegradation factor-Apatococcus lobatus...
2017: PloS One
https://www.readbyqxmd.com/read/28805493/pathways-for-external-alkalinization-in-intact-and-in-microwounded-chara-cells-are-differentially-sensitive-to-wortmannin
#2
Alexander A Bulychev, Ilse Foissner
Proton flows across the plant cell membranes play a major role in electrogenesis and regulation of photosynthesis and ion balance. The profiles of external pH along the illuminated internodal cells of characean algae consist of alternating high- and low-pH zones that are spatially coordinated with the distribution of photosynthetic activity of chloroplasts underlying these zones. The results based on confocal laser scanning fluorescence microscopy, pH microsensors, and pulse-amplitude-modulated chlorophyll microfluorometry revealed that the coordination of H(+) transport and photosynthesis is disrupted by the two different environmental cues (low light and wounding) and by a chemical, wortmannin interfering with the inositol phospholipid metabolism...
August 14, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28803921/molecular-evidence-of-apatococcus-including-a-fuscideae-sp-nov-as-photobiont-in-the-genus-fuscidea
#3
Martina Zahradníková, Heidi L Andersen, Tor Tønsberg, Andreas Beck
The knowledge of the taxonomy and classification of algae (including lichenized) has recently increased rapidly, but there are still many gaps. We aimed to 1) identify the Fuscidea photobionts by locating their taxonomic positions in the green algal classification, and 2) to resolve their interspecific relationships. The lichenized algae were examined based on morphological observations of axenic isolates as well as molecular studies of 18S and ITS nrDNA sequences. Analysis of the secondary structure of the ITS2 operon complemented these investigations...
June 29, 2017: Protist
https://www.readbyqxmd.com/read/28803869/metabolic-flexibility-underpins-growth-capabilities-of-the-fastest-growing-alga
#4
Haim Treves, Omer Murik, Isaac Kedem, Doron Eisenstadt, Sagit Meir, Ilana Rogachev, Jedrzej Szymanski, Nir Keren, Isabel Orf, Antonio F Tiburcio, Rubén Alcázar, Asaph Aharoni, Joachim Kopka, Aaron Kaplan
The factors rate-limiting growth of photosynthetic organisms under optimal conditions are controversial [1-8]. Adaptation to extreme environments is usually accompanied by reduced performance under optimal conditions [9, 10]. However, the green alga Chlorella ohadii, isolated from a harsh desert biological soil crust [11-17], does not obey this rule. In addition to resistance to photodamage [17, 18], it performs the fastest growth ever reported for photosynthetic eukaryotes. A multiphasic growth pattern (very fast growth [phase I], followed by growth retardation [phase II] and additional fast growth [phase III]) observed under constant illumination and temperature indicates synchronization of the algal population...
August 3, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28803104/exploration-of-a-mechanism-for-the-production-of-highly-unsaturated-fatty-acids-in-scenedesmus-sp-at-low-temperature-grown-on-oil-crop-residue-based-medium
#5
Qian Lu, Jun Li, Jinghan Wang, Kun Li, Jingjing Li, Pei Han, Paul Chen, Wenguang Zhou
The ability of algae to produce lipids comprising of unsaturated fatty acids varies with strains and culture conditions. This study investigates the effect of temperature on the production of unsaturated fatty acids in Scenedesmus sp. grown on oil crop residue based medium. At low temperature (10°C), synthesis of lipids compromising of high contents of unsaturated fatty acids took place primarily in the early stage while protein accumulation mainly occurred in the late stage. This stepwise lipid-protein synthesis process was found to be associated with the contents of acetyl-CoA and α-KG in the algal cells...
August 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28803063/cascading-biomethane-energy-systems-for-sustainable-green-gas-production-in-a-circular-economy
#6
REVIEW
David M Wall, Shane McDonagh, Jerry D Murphy
Biomethane is a flexible energy vector that can be used as a renewable fuel for both the heat and transport sectors. Recent EU legislation encourages the production and use of advanced, third generation biofuels with improved sustainability for future energy systems. The integration of technologies such as anaerobic digestion, gasification, and power to gas, along with advanced feedstocks such as algae will be at the forefront in meeting future sustainability criteria and achieving a green gas supply for the gas grid...
July 23, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28802140/cell-density-dependence-of-microcystis-aeruginosa-responses-to-copper-algaecide-concentrations-implications-for-microcystin-lr-release
#7
Ciera M Kinley, Kyla J Iwinski, Maas Hendrikse, Tyler D Geer, John H Rodgers
Along with mechanistic models, predictions of exposure-response relationships for copper are often derived from laboratory toxicity experiments with standardized experimental exposures and conditions. For predictions of copper toxicity to algae, cell density is a critical factor often overlooked. For pulse exposures of copper-based algaecides in aquatic systems, cell density can significantly influence copper sorbed by the algal population, and consequent responses. A cyanobacterium, Microcystis aeruginosa, was exposed to a copper-based algaecide over a range of cell densities to model the density-dependence of exposures, and effects on microcystin-LR (MC-LR) release...
August 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28802096/comparison-of-cleaning-methods-for-delicate-insect-specimens-for-scanning-electron-microscopy
#8
Katharina Schneeberg, René Bauernfeind, Hans Pohl
The objective of the present study was to compare cleaning methods for delicate insect specimens for investigations with scanning electron microscopy (SEM). As typical specimens we used aquatic larvae of mosquitoes, springtails, larvae of mayflies and caterpillars because they are very fragile and large parts of their body consist of soft tissue. Additionally their cuticle is very often covered with dirt, soil particles or other materials. Cleaning with ultrasonic sound, as the most common cleaning method used for SEM, will destroy fragile insects...
August 12, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28801171/microorganisms-based-methods-for-harmful-algal-blooms-control-a-review
#9
REVIEW
Rui Sun, Pengfei Sun, Jianhong Zhang, Sofia Esquivel-Elizondo, Yonghong Wu
Harmful algal blooms (HABs) are a worldwide problem with numerous negative effects on water systems, which have prompted researchers to study applicable measures to inhibit and control them. This review summarized the current microorganisms-based methods or technologies aimed at controlling HABs. Based on their characteristics, these methods can be divided into two categories: methods based on single-species microorganisms and methods based on microbial aggregates, and four types: methods for rapid decrease of algal cells density (e...
August 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28800687/the-profound-effect-of-harmful-cyanobacterial-blooms-from-food-web-and-management-perspectives
#10
Sigitas Šulčius, Danguolė Montvydienė, Hanna Mazur-Marzec, Jūratė Kasperovičienė, Rokas Rulevičius, Živilė Cibulskaitė
Sustainable and effective water management plans must have a reliable risk assessment strategies for harmful cyanobacterial blooms (HABs) that would enable timely decisions to be made, thus avoiding the trespassing of ecological thresholds, leading to the collapse of ecosystem structure and function. Such strategies are usually based on cyanobacterial biomass and/or on the monitoring of known toxins, which may, however, in many cases, under- or over-represent the actual toxicity of the HAB. Therefore, in this study, by the application of growth-inhibition assays using different bacteria, algae, zooplankton and fish species, we assessed the toxicological potential of two cyanobacterial blooms that differed in total cyanobacterial biomass, species composition and cyanopeptide profiles...
August 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28800685/occurrence-and-ecological-hazard-assessment-of-selected-antibiotics-in-the-surface-waters-in-and-around-lake-honghu-china
#11
Zhi Wang, Yun Du, Chao Yang, Xi Liu, Junqian Zhang, Enhua Li, Qing Zhang, Xuelei Wang
The occurrence and temporal-spatial distributions of 13 antibiotics (tetracyclines, sulfonamides, and fluoroquinolones) in the water of a high-intensity aquaculture lake, Honghu Lake, and its associated river network and ponds were investigated. Tetracycline, oxytetracycline, chlortetracycline, and sulfadiazine are the four dominant antibiotics in this region, with maximum and median concentrations of 1454.8 and 304.8ng/L, 2796.6 and 161.9ng/L, 1431.3 and 349.9ng/L, and 499.5 and 106.5ng/L, respectively. The median concentrations of the other nine antibiotics are lower than 57...
August 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28798913/assessing-nutrient-removal-kinetics-in-flushed-manure-using-chlorella-vulgaris-biomass-production
#12
Pramod Pandey, Jun Shi
The utilization of dairy wastewater for producing algal biomass is seen as a two-fold opportunity to treat wastewater and produce algae biomass, which can be potentially used for production of biofuels. In animal agriculture system, one of the major waste streams is dairy manure that contains high levels of nitrogen and phosphorus. Furthermore, it is produced abundantly in California's dairy industry, as well as many other parts of the world. We hypothesized that flushed manure, wastewater from a dairy farm, can be used as a potential feedstock after pretreatment to grow Chlorella vulgaris biomass and to reduce nutrients of manure...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28798763/maturation-of-plastid-c-type-cytochromes
#13
REVIEW
Stéphane T Gabilly, Patrice P Hamel
Cytochromes c are hemoproteins, with the prosthetic group covalently linked to the apoprotein, which function as electron carriers. A class of cytochromes c is defined by a CXXCH heme-binding motif where the cysteines form thioether bonds with the vinyl groups of heme. Plastids are known to contain up to three cytochromes c. The membrane-bound cytochrome f and soluble cytochrome c6 operate in photosynthesis while the activity of soluble cytochrome c6A remains unknown. Conversion of apo- to holocytochrome c occurs in the thylakoid lumen and requires the independent transport of apocytochrome and heme across the thylakoid membrane followed by the stereospecific attachment of ferroheme via thioether linkages...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28798164/draft-nuclear-genome-complete-chloroplast-genome-and-complete-mitochondrial-genome-for-the-biofuel-bioproduct-feedstock-species-scenedesmus-obliquus-strain-doe0152z
#14
S R Starkenburg, J E W Polle, B Hovde, H E Daligault, K W Davenport, A Huang, P Neofotis, Z McKie-Krisberg
The green alga Scenedesmus obliquus is an emerging platform species for the industrial production of biofuels. Here, we report the draft assembly and annotation for the nuclear, plastid, and mitochondrial genomes of S. obliquus strain DOE0152z.
August 10, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28797900/elimination-and-ecotoxicity-evaluation-of-phthalic-acid-esters-from-textile-dyeing-wastewater
#15
Jieying Liang, Xun-An Ning, Minyi Kong, Daohua Liu, Guangwen Wang, Haili Cai, Jian Sun, Yaping Zhang, Xingwen Lu, Yong Yuan
Phthalic acid esters (PAEs), presented in fabrics, surfactants and detergents, were discharged into the ecosystem during textile-dyeing wastewater treatment and might have adverse effects on water ecosystems. In this study, comprehensive investigations of the content and component distributions of 12 PAEs across different units of four textile-dyeing wastewater plants were carried out in Guangdong Province, China. Ecotoxicity assessments were also conducted based on risk quotients (RQs). On average, 93.54% TOC and 80...
August 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28797596/an-update-on-aureochromes-phylogeny-mechanism-function
#16
REVIEW
Peter G Kroth, Christian Wilhelm, Tilman Kottke
Light is important for algae, as it warrants metabolic independence via photosynthesis. In addition to the absorption of light by the photosystems, algae possess a variety of specific photoreceptors that allow the quantification of the light fluxes as well as the assessment of light qualities. About a decade ago, aureochromes have been described in the xanthophyte alga Vaucheria frigida. These proteins represent a new type of blue light photoreceptor as they possess both a light-oxygen-voltage (LOV) domain for light reception as well as a basic region leucine zipper (bZIP) domain for DNA binding, indicating that they represent light-driven transcription factors...
July 11, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28793401/removal-of-phenanthrene-from-coastal-waters-by-green-tide-algae-ulva-prolifera
#17
Cui Zhang, Jian Lu, Jun Wu, Yongming Luo
Ulva prolifera (U. prolifera) has been frequently involved in terrible algal proliferation in coastal areas. Although it is known to be associated with green tide, its contribution to the natural attenuation of the polycyclic aromatic hydrocarbons (PAHs) in seawater has not been evaluated. In this study, the removal of phenanthrene using U. prolifera collected from coastal water with green tide blooming was investigated. The results showed that phenanthrene could be removed efficiently in the presence of both the live and heat-killed U...
August 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28792736/chemical-synthesis-of-oligosaccharides-related-to-the-cell-walls-of-plants-and-algae
#18
Christine Kinnaert, Mathilde Daugaard, Faranak Nami, Mads H Clausen
Plant cell walls are composed of an intricate network of polysaccharides and proteins that varies during the developmental stages of the cell. This makes it very challenging to address the functions of individual wall components in cells, especially for highly complex glycans. Fortunately, structurally defined oligosaccharides can be used as models for the glycans, to study processes such as cell wall biosynthesis, polysaccharide deposition, protein-carbohydrate interactions, and cell-cell adhesion. Synthetic chemists have focused on preparing such model compounds, as they can be produced in good quantities and with high purity...
August 9, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28792654/euchlorocystis-gen-nov-and-densicystis-gen-nov-two-new-genera-of-oocystaceae-algae-from-high-altitude-semi-saline-habitat-trebouxiophyceae-chlorophyta
#19
Xudong Liu, Huan Zhu, Huiyin Song, Qinghua Wang, Xiong Xiong, Chenxi Wu, Guoxiang Liu, Zhengyu Hu
The Oocystaceae family is generally considered to contain common freshwater eukaryotic microalgae, and few are reported living in semi-saline habitats. Our latest ecological survey in Qinghai Lake and Angzicuo Lake, both large, closed, high-altitude, semi-saline lakes located on the Qinghai-Tibet plateau in China, revealed Oocystaceae species as a dominant group among plankton. Since limited knowledge exists about semi-saline species in the Oocystaceae family, a taxonomical study was carried out using morphological and phylogenetic methods...
August 9, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28791888/removal-of-organics-by-combined-process-of-coagulation-chlorination-ultrafiltration-optimization-of-overall-operation-parameters
#20
Gongduan Fan, Zhaoyue Su, Rujing Lin, Zhuwu Jiang, Renxing Xu, Shumin Wang
In order to gain the run parameters of the combined process of coagulation/in situ chlorination/ultrafiltration (UF) so that the system can remove as much organic contaminants as possible without serious membrane fouling, the impacts of operation conditions in coagulation and pre-chlorination unit on organics removal and membrane fouling rate were investigated in a pilot-scale test. The characteristics of organics in UF influent were examined by using the method of excitation emission matrix spectroscopy (EEMs) to find out fouling behavior of different natural organic matter (NOM) compositions to UF membrane...
August 9, 2017: Environmental Technology
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