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https://www.readbyqxmd.com/read/28630316/recombinant-silicateins-as-model-biocatalysts-in-organosiloxane-chemistry
#1
S Yasin Tabatabaei Dakhili, Stephanie A Caslin, Abayomi S Faponle, Peter Quayle, Sam P de Visser, Lu Shin Wong
The family of silicatein enzymes from marine sponges (phylum Porifera) is unique in nature for catalyzing the formation of inorganic silica structures, which the organisms incorporate into their skeleton. However, the synthesis of organosiloxanes catalyzed by these enzymes has thus far remained largely unexplored. To investigate the reactivity of these enzymes in relation to this important class of compounds, their catalysis of Si-O bond hydrolysis and condensation was investigated with a range of model organosilanols and silyl ethers...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28618302/growth-and-physiological-responses-of-a-marine-diatom-phaeodactylum-tricornutum-against-two-imidazolium-based-ionic-liquids-c4mim-bf4-and-c8mim-bf4
#2
Xiang-Yuan Deng, Biao Chen, Da Li, Xiao-Li Hu, Jie Cheng, Kun Gao, Chang-Hai Wang
Ionic liquids (ILs) have been considered as "green" substitutes for traditional organic solvents in many existing biological and chemical areas. However, they have high solubility and poor biodegradability in water, suggesting that they could become persistent chemical pollutants in aquatic environment. The ability of two widely used imidazolium-based ILs to affect the growth and physiological characteristics of a marine diatom (Phaeodactylum tricornutum) was investigated in this study. The diatom was exposed to different concentrations of 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim]BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate ([C8mim]BF4) for 96h within a batch-culture system...
May 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28609736/effects-of-continental-anthropogenic-sources-on-organic-aerosols-in-the-coastal-atmosphere-of-east-china
#3
Dongjie Shang, Min Hu, Qingfeng Guo, Qi Zou, Jing Zheng, Song Guo
Although organic compounds in marine atmospheric aerosols have significant effects on climate and marine ecosystems, they have rarely been studied, especially in the coastal regions of East China. To assess the origins of the organic aerosols in the East China coastal atmosphere, PM2.5 samples were collected from the atmospheres of the Yellow Sea, the East China Sea, and Changdao Island during the CAPTAIN (Campaign of Air PolluTion At INshore Areas of Eastern China) field campaign in the spring of 2011. The marine atmospheric aerosol samples that were collected were grouped based on the backward trajectories of their air masses...
June 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28605381/ecotoxicological-method-with-marine-bacteria-vibrio-anguillarum-to-evaluate-the-acute-toxicity-of-environmental-contaminants
#4
Alice Rotini, Loredana Manfra, Filippo Spanu, Marco Pisapia, Anna Maria Cicero, Luciana Migliore
Bacteria are an important component of the ecosystem, and microbial community alterations can have a significant effect on biogeochemical cycling and food webs. Toxicity testing based on microorganisms are widely used because they are relatively quick, reproducible, cheap, and are not associated with ethical issues. Here, we describe an ecotoxicological method to evaluate the biological response of the marine bacterium Vibrio anguillarum. This method assesses the acute toxicity of chemical compounds, including new contaminants such as nanoparticles, as well as environmental samples...
May 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28601525/anti-mycobacterial-alkaloids-cyclic-3-alkyl-pyridinium-dimers-from-the-indonesian-marine-sponge-haliclona-sp
#5
Wilmar Maarisit, Delfly B Abdjul, Hiroyuki Yamazaki, Hajime Kato, Henki Rotinsulu, Defny S Wewengkang, Deiske A Sumilat, Magie M Kapojos, Kazuyo Ukai, Michio Namikoshi
Three new dimeric 3-alkyl pyridinium alkaloids, named haliclocyclamines A-C (1-3), were isolated together with five known congeners, cyclostellettamines A (4), B (5), C (6), E (7), and F (8), from the Indonesian marine sponge Haliclona sp. The structures of 1-3 were assigned based on their spectroscopic data (1D and 2D NMR, HRFABMS, ESIMS/MS, UV, and IR). Compounds 1-8 exhibited antimicrobial activities against Mycobacterium smegmatis with inhibition zones of 17, 10, 13, 14, 8, 8, 12, and 12mm, respectively, at 10μg/disc...
May 23, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28599207/mercury-and-persistent-organic-pollutants-in-native-and-invading-forage-species-of-the-canadian-arctic-consequences-for-food-web-dynamics
#6
Sara Pedro, Aaron T Fisk, Gregg T Tomy, Steven H Ferguson, Nigel E Hussey, Steven T Kessel, Melissa A McKinney
Contaminant dynamics within Arctic marine food webs may be altered through the climate-driven northward invasions of temperate/boreal species. Here, we compare tissue concentrations of total mercury (THg) and legacy and emerging persistent organic pollutants (POPs) in native versus invading forage species sampled from 2012 to 2014 near Arviat, Clyde River, and Resolute Bay, NU, representing, low, mid- and high eastern Canadian Arctic regions, respectively. Concentrations of THg, legacy Σ-polychlorinated biphenyls (ΣPCB) and Σ-organochlorine (ΣOC) pesticides were detected in all forage species, whereas emerging halogenated flame retardants were detected in only a few individuals...
June 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28584967/effect-of-uv-b-radiation-and-desiccation-stress-on-photoprotective-compounds-accumulation-in-marine-leptolyngbya-sp
#7
Devika Joshi, C Mohandass, Mohan Dhale
Increased awareness regarding the harmful effects of ultraviolet (UV)-B radiation has led to the search for new sources of natural UV-B protecting compounds. Mycosporine-like amino acids are one of such promising compounds found in several organisms. Cyanobacteria are ideal organisms for isolation of these compounds due to their compatibility and adaptability to thrive under harsh environmental conditions. In the following investigation, we report the production of shinorine in Leptolyngbya sp. isolated from the intertidal region...
June 6, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28582796/relative-molar-response-of-lipophilic-marine-algal-toxins-in-liquid-chromatography-electrospray-ionization-mass-spectrometry
#8
Zita Zendong, Manoella Sibat, Christine Herrenknecht, Philipp Hess, Pearse McCarron
RATIONALE: Accurate quantitative analysis of lipophilic toxins by liquid chromatography-mass spectrometry (LC-MS) requires calibration solution reference materials (RMs) for individual toxin analogs. Untargeted analysis is aimed at identifying a vast number of compounds and thus validation of fully quantitative untargeted methods is not feasible. However, a semi-quantitative approach allowing for profiling is still required and will be strengthened by knowledge of the relative molar response (RMR) of analogs in liquid chromatography-mass spectrometry (LC-MS) with electrospray ionization (ESI)...
June 5, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28577594/errors-in-alkylated-polycyclic-aromatic-hydrocarbon-and-sulfur-heterocycle-concentrations-caused-by-currently-employed-standardized-methods
#9
Nicholas M Wilton, Stephen A Wise, Albert Robbat
Alkylated polycyclic aromatic hydrocarbon (PAH) and polycyclic aromatic sulfur heterocycle (PASH) standardized methods often rely on gas chromatography/mass spectrometry operated in the selected ion monitoring mode (GC/MS-SIM). The objective of this study is to develop a method that produces accurate data while minimizing sample preparation and achieving low levels of detection. Most standardized methods are based on acquiring a given homologue's molecular ion (1-ion). Some methods include a second, confirming ion (2-ion) in the hopes of excluding non-target ion signals from the total homologue peak area...
July 18, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28567447/comparative-genomic-analysis-reveals-habitat-specific-genes-and-regulatory-hubs-within-the-genus-novosphingobium
#10
Roshan Kumar, Helianthous Verma, Shazia Haider, Abhay Bajaj, Utkarsh Sood, Kalaiarasan Ponnusamy, Shekhar Nagar, Mallikarjun N Shakarad, Ram Krishan Negi, Yogendra Singh, J P Khurana, Jack A Gilbert, Rup Lal
Species belonging to the genus Novosphingobium are found in many different habitats and have been identified as metabolically versatile. Through comparative genomic analysis, we identified habitat-specific genes and regulatory hubs that could determine habitat selection for Novosphingobium spp. Genomes from 27 Novosphingobium strains isolated from diverse habitats such as rhizosphere soil, plant surfaces, heavily contaminated soils, and marine and freshwater environments were analyzed. Genome size and coding potential were widely variable, differing significantly between habitats...
May 2017: MSystems
https://www.readbyqxmd.com/read/28566703/astronomical-age-constraints-and-extinction-mechanisms-of-the-late-triassic-carnian-crisis
#11
Charlotte S Miller, Francien Peterse, Anne-Christine da Silva, Viktória Baranyi, Gert J Reichart, Wolfram M Kürschner
The geological record contains evidence for numerous pronounced perturbations in the global carbon cycle, some of which are associated with mass extinction. In the Carnian (Late Triassic), evidence from sedimentology and fossil pollen points to a significant change in climate, resulting in biotic turnover, during a time termed the 'Carnian Pluvial Episode' (CPE). Evidence from the marine realm suggests a causal relationship between the CPE, a global 'wet' period, and the injection of light carbon into the atmosphere...
May 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28552249/the-measurement-of-bisphenol-a-and-its-analogues-perfluorinated-compounds-in-twenty-species-of-freshwater-and-marine-fishes-a-time-trend-comparison-and-human-health-based-assessment
#12
Y M Wong, R Li, C K F Lee, H T Wan, Chris K C Wong
Our previous study in 2011 reported the detection of BPA and PFAAs in 20 species of marine and freshwater fishes. With an emerging evidence to suggest the metabolic-disrupting effects of BPA/PFAAs in animals, the present study was aimed to provide a time-trend analysis to determine the current concentrations of PFAAs and BPA in 20 commercially available Hong Kong species of fishes. Since the manufacture and use of BPA is being prohibited in most nations, the introduction of BPA alternatives has recently been incorporated in the markets...
May 25, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28528426/building-a-bio-based-industry-in-the-middle-east-through-harnessing-the-potential-of-the-red-sea-biodiversity
#13
REVIEW
Jens Nielsen, John Archer, Magbubah Essack, Vladimir B Bajic, Takashi Gojobori, Ivan Mijakovic
The incentive for developing microbial cell factories for production of fuels and chemicals comes from the ability of microbes to deliver these valuable compounds at a reduced cost and with a smaller environmental impact compared to the analogous chemical synthesis. Another crucial advantage of microbes is their great biological diversity, which offers a much larger "catalog" of molecules than the one obtainable by chemical synthesis. Adaptation to different environments is one of the important drives behind microbial diversity...
May 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28527417/fate-of-the-sunscreen-compound-oxybenzone-in-cyperus-alternifolius-based-hydroponic-culture-uptake-biotransformation-and-phytotoxicity
#14
Feiran Chen, Christian Huber, Peter Schröder
Oxybenzone (OBZ), a common ingredient in sunscreens and personal care products, has been frequently detected in effluents from municipal wastewater treatment plants and also in surface waters. OBZ is an emerging contaminant due to its adverse impacts on marine/aquatic ecosystems. To investigate the removal and degradation capacity of phytotreatment for OBZ, the common wetland plant species Cyperus alternifolius L. was exposed to this compound at 5, 25 and 50 μM for 120 h, respectively. Continuous uptake by roots and accumulation in plant tissues was observed over the exposure time, and depletion of spiked OBZ from the aqueous medium exceeded 73...
May 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28509846/a-new-ergosterol-analog-a-new-bis-anthraquinone-and-anti-obesity-activity-of-anthraquinones-from-the-marine-sponge-associated-fungus-talaromyces-stipitatus-kufa-0207
#15
Jidapa Noinart, Suradet Buttachon, Tida Dethoup, Luís Gales, José A Pereira, Ralph Urbatzka, Sara Freitas, Michael Lee, Artur M S Silva, Madalena M M Pinto, Vítor Vasconcelos, Anake Kijjoa
A new ergosterol analog, talarosterone (1) and a new bis-anthraquinone derivative (3) were isolated, together with ten known compounds including palmitic acid, ergosta-4,6,8(14),22-tetraen-3-one, ergosterol-5,8-endoperoxide, cyathisterone (2), emodin (4a), questinol (4b), citreorosein (4c), fallacinol (4d), rheoemodin (4e) and secalonic acid A (5), from the ethyl acetate extract of the culture of the marine sponge-associated fungus Talaromyces stipitatus KUFA 0207. The structures of the new compounds were established based on extensive 1D and 2D spectral analysis, and in the case of talarosterone (1), the absolute configurations of its stereogenic carbons were determined by X-ray crystallographic analysis...
May 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28481239/anti-inflammatory-activity-and-structure-activity-relationships-of-brominated-indoles-from-a-marine-mollusc
#16
Tarek B Ahmad, David Rudd, Joshua Smith, Michael Kotiw, Peter Mouatt, Lisa M Seymour, Lei Liu, Kirsten Benkendorff
Marine molluscs are rich in biologically active natural products that provide new potential sources of anti-inflammatory agents. Here we used bioassay guided fractionation of extracts from the muricid Dicathais orbita to identify brominated indoles with anti-inflammatory activity, based on the inhibition of nitric oxide (NO) and tumour necrosis factor α (TNFα) in lipopolysaccharide (LPS) stimulated RAW264.7 macrophages and prostaglandin E2 (PGE2) in calcium ionophore-stimulated 3T3 ccl-92 fibroblasts. Muricid brominated indoles were then compared to a range of synthetic indoles to determine structure-activity relationships...
May 6, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28455852/practical-application-of-in-silico-fragmentation-based-residue-screening-with-ion-mobility-high-resolution-mass-spectrometry
#17
Anton Kaufmann, Patrick Butcher, Kathry Maden, Stephan Walker, Mirjam Widmer
RATIONALE: A screening concept for residues in complex matrices based on liquid chromatography coupled to ion mobility high-resolution mass spectrometry LC/IMS-HRMS is presented. The comprehensive four-dimensional data (chromatographic retention time, drift time, mass-to-charge and ion abundance) obtained in data-independent acquisition (DIA) mode was used for data mining. An in silico fragmenter utilizing a molecular structure database was used for suspect screening, instead of targeted screening with reference substances...
July 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28454029/aerosol-contributions-at-an-urban-background-site-in-eastern-mediterranean-potential-source-regions-of-pahs-in-pm10-mass
#18
Konstantinos Dimitriou, Pavlos Kassomenos
In this paper, two backward air mass trajectory-based models (Potential Source Contribution Function [PSCF] and Concentration Weighted Trajectory [CWT]) were combined, aiming to identify sources and factors defining the load of PM in the city of Limassol (Cyprus). The study also focused on the determination of atmospheric pathways enriching the aerosol phase of four carcinogenic Polycyclic Aromatic Hydrocarbons (PAHs): Benzo(a)pyrene (BaP), Benzo(a)anthracene (BaA), Benzo(b)fluoranthene (BbF) and Benzo(k)fluoranthene (BkF), in PM10 mass...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28445005/proteomic-based-investigations-on-the-mode-of-action-of-the-marine-anticancer-compound-rhizochalinin
#19
Sergey A Dyshlovoy, Katharina Otte, Simone Venz, Jessica Hauschild, Heike Junker, Tatyana N Makarieva, Stefan Balabanov, Winfried H Alsdorf, Ramin Madanchi, Friedemann Honecker, Carsten Bokemeyer, Valentin A Stonik, Gunhild von Amsberg
Rhizochalinin (Rhiz) is a novel marine natural sphingolipid-like compound which shows promising in vitro and in vivo activity in human castration-resistant prostate cancer (CRPC). In the present study, a global proteome screening approach was applied to investigate molecular targets and biological processes affected by Rhiz in CRPC. Bioinformatical analysis of the data predicted an anti-migratory effect of Rhiz on cancer cells. Validation of proteins involved in the cancer-associated processes, including cell migration and invasion, revealed down-regulation of specific isoforms of stathmin and LASP1, as well as up-regulation of Grp75, keratin 81, and precursor IL-1β by Rhiz...
April 26, 2017: Proteomics
https://www.readbyqxmd.com/read/28441364/indole-derivatives-produced-by-the-metagenome-genes-of-the-escherichia-coli-harboring-marine-sponge-discodermia-calyx
#20
Feng-Lou Liu, Xiao-Long Yang
Three indole derivatives, a novel benzoxazine-indole hybrid (1) and two known indole trimers (2, 3), were isolated from the metagenomic library of the marine sponge Discodermia calyx based on functional screening. Their structures were elucidated by extensive spectroscopic analysis and comparison of their NMR data to that of known compounds. The antibacterial assay indicated that only compound 2 displayed significant antibacterial activity against Bacillus cereus, with approximately 20 mm diameter growth inhibition at 10 µg/paper...
April 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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