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https://www.readbyqxmd.com/read/28109209/nostoc-thermotolerans-sp-nov-a-soil-dwelling-species-of-nostoc-cyanobacteria-isolated-from-madhya-pradesh-india
#1
Archana Suradkar, Chelsea Villanueva, Lira A Gaysina, Dale A Casamatta, Aniket Saraf, Gandhali Dighe, Ratnaprabha Mergu, Prashant Singh
A filamentous, soil dwelling cyanobacterial strain (9C-PS) was isolated from Mandsaur, Madhya Pradesh, India and is being described as new species of Nostoc. Extensive morphological and molecular characterization along with thorough assessment of ecology was performed. The style of filament orientation, type and nature of the sheath (e.g., distribution and visibility across the trichome), and vegetative and heterocyte cell dimensions and shape were assessed for more than a year employing both culture and naturally occurring samples...
January 19, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28108920/biochemical-and-physiological-responses-of-halophilic-nanophytoplankton-dunaliella-salina-from-exposure-to-xeno-estrogen-17%C3%AE-ethinylestradiol
#2
Dalel Belhaj, Khaled Athmouni, Doniez Frikha, Monem Kallel, Abdelfattah El Feki, Sami Maalej, John L Zhou, Habib Ayadi
The environmental impacts of various pollutants on the entire levels of organisms are under investigation. Among these pollutants, endocrine-disrupting compounds (EDCs) present a serious hazard, even though the environmental significance of these compounds remains basically unknown. To drop some light on this field, we assessed the effects of a 11-day exposure of 17α-ethinylestradiol (EE2) on the growth, metabolic content, antioxidant response, oxidative stress, and genetic damage of Dunaliella salina, isolated from Tunisian biotopes...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28107748/tracing-the-sources-and-cycling-of-phosphorus-in-river-sediments-using-oxygen-isotopes-methodological-adaptations-and-first-results-from-a-case-study-in-france
#3
Chiara Pistocchi, Federica Tamburini, Gerard Gruau, André Ferhi, Dominique Trevisan, Jean-Marcel Dorioz
An essential aspect of eutrophication studies is to trace the ultimate origin of phosphate ions (P-PO4) associated with the solid phase of river sediments, as certain processes can make these ions available for algae. However, this is not a straightforward task because of the diversity of allochthonous and autochthonous sources that can supply P-PO4 to river sediments as well as the existence of in-stream processes that can change the speciation of these inputs and obscure the original sources. Here, we present the results of a study designed to explore the potentials, limitations and conditions for the use of the oxygen isotope composition of phosphate (δ(18)Op) extracted from river sediments for this type of tracing...
December 26, 2016: Water Research
https://www.readbyqxmd.com/read/28107722/microalgae-biorefinery-high-value-products-perspectives
#4
Kit Wayne Chew, Jing Ying Yap, Pau Loke Show, Ng Hui Suan, Joon Ching Juan, Tau Chuan Ling, Duu-Jong Lee, Jo-Shu Chang
Microalgae have received much interest as a biofuel feedstock in response to the uprising energy crisis, climate change and depletion of natural sources. Development of microalgal biofuels from microalgae does not satisfy the economic feasibility of overwhelming capital investments and operations. Hence, high-value co-products have been produced through the extraction of a fraction of algae to improve the economics of a microalgae biorefinery. Examples of these high-value products are pigments, proteins, lipids, carbohydrates, vitamins and anti-oxidants, with applications in cosmetics, nutritional and pharmaceuticals industries...
January 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28106912/the-phycocyanobilin-chromophore-of-streptophyte-algal-phytochromes-is-synthesized-by-hy2
#5
Nathan C Rockwell, Shelley S Martin, Fay-Wei Li, Sarah Mathews, John Clark Lagarias
Land plant phytochromes perceive red and far-red light to control growth and development, using the linear tetrapyrrole (bilin) chromophore phytochromobilin (PΦB). Phytochromes from streptophyte algae, sister species to land plants, instead use phycocyanobilin (PCB). PCB and PΦB are synthesized by different ferredoxin-dependent bilin reductases (FDBRs): PΦB is synthesized by HY2, whereas PCB is synthesized by PcyA. The pathway for PCB biosynthesis in streptophyte algae is unknown. We used phylogenetic analysis and heterologous reconstitution of bilin biosynthesis to investigate bilin biosynthesis in streptophyte algae...
January 20, 2017: New Phytologist
https://www.readbyqxmd.com/read/28106757/new-enzyme-inhibitory-triterpenoid-from-marine-macro-brown-alga-padina-boergesenii-allender-kraft
#6
Liaqat Ali, Abdul Latif Khan, Muhammad Al-Broumi, Rashid Al-Harrasi, Lubna Al-Kharusi, Javid Hussain, Ahmed Al-Harrasi
In continuation to our study of the chemical and biological potential of the secondary metabolites isolated from Omani seaweeds, we investigated a marine brown alga, Padina boergesenii. The phytochemical investigation resulted in the isolation of a new secondary metabolite, padinolic acid (1), along with some other semi-pure fractions and sub-fractions. The planar structure was confirmed through MS and NMR (1D and 2D) spectral data. The NOESY experiments coupled with the biogenetic consideration were helpful in assigning the stereochemistry in the molecule...
January 18, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28106281/a-re-evaluation-of-petrotox-for-predicting-acute-and-chronic-toxicity-of-petroleum-substances
#7
Aaron D Redman, Thomas F Parkerton, M Leon Paumen, Josh D Butler, Daniel J Letinski, Klass den Haan
PETROTOX was developed to perform aquatic hazard assessment of petroleum substances (PS) based on substance composition. The model relies on the Hydrocarbon Block Method which is widely used for conducting PS risk assessments providing further justification for evaluating model performance. Previous work described this model and provided a preliminary calibration and validation using acute toxicity data for limited PS. The objective of this study is to re-evaluate PETROTOX using expanded data covering both acute and chronic toxicity endpoints on invertebrates, algae, and fish for a wider range of PS...
January 20, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28106164/diverse-strategies-of-o2-usage-for-preventing-photo-oxidative-damage-under-co2-limitation-during-algal-photosynthesis
#8
Ginga Shimakawa, Yusuke Matsuda, Kensuke Nakajima, Masahiro Tamoi, Shigeru Shigeoka, Chikahiro Miyake
Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO2 using the chemical energy. Thus, CO2 limitation causes an accumulation of excess energy, resulting in reactive oxygen species (ROS) which can cause oxidative damage to cells. O2 can be used as an alternative energy sink when oxygenic phototrophs are exposed to high light. Here, we examined the responses to CO2 limitation and O2 dependency of two secondary algae, Euglena gracilis and Phaeodactylum tricornutum...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28104651/draft-genome-sequence-of-the-oleaginous-green-alga-tetradesmus-obliquus-utex-393
#9
B M Carreres, L de Jaeger, J Springer, M J Barbosa, G Breuer, E J van den End, D M M Kleinegris, I Schäffers, E J H Wolbert, H Zhang, P P Lamers, R B Draaisma, V A P Martins Dos Santos, R H Wijffels, G Eggink, P J Schaap, D E Martens
The microalgae Tetradesmus obliquus is able to maintain a high photosynthetic efficiency under nitrogen limitation and is considered a promising green microalgae for sustainable production of diverse compounds, including biofuels. Here, we report the first draft whole-genome shotgun sequencing of T. obliquus The final assembly comprises 108,715,903 bp with over 1,368 scaffolds.
January 19, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28104477/enantioselective-oxidative-stress-and-oxidative-damage-caused-by-rac-%C3%A2-and-s-metolachlor-to-scenedesmus-obliquus
#10
Huijun Liu, YiLu Xia, Weidan Cai, Yina Zhang, Xiaoqiang Zhang, Shaoting Du
The rational use and environmental security of chiral pesticides has gained the interest of many researchers. The enantioselective effects of Rac- and S-metolachlor on oxidative stress in Scenedesmus obliquus were determined in this study. Stronger green fluorescence was observed in response to S-metolachlor treatment than to Rac-metolachlor treatment, suggesting that more reactive oxygen species (ROS) were stimulated by S-metolachlor. ROS levels following S-metolachlor treatment were 1.92-, 8.31-, and 1.08-times higher than those observed following Rac-metolachlor treatment at 0...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28103686/assigning-the-algal-source-of-dimethylsulfide-using-a-selective-lyase-inhibitor
#11
Uria Alcolombri, Lei Lei, Diana Meltzer, Assaf Vardi, Dan S Tawfik
Atmospheric dimethylsulfide (DMS) is massively produced in the oceans by bacteria, algae, and corals. To enable identification of DMS sources, we developed a potent mechanism-based inhibitor of the algal Alma dimethylsulfoniopropionate lyase family that does not inhibit known bacterial lyases. Its application to coral holobiont indicates that DMS originates from Alma lyase(s). This biochemical profiling may complement meta-genomics and transcriptomics to provide better understanding of the marine sulfur cycle...
January 20, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28103409/zea-mays-fe-deficiency-related-4-zmfdr4-functions-as-an-iron-transporter-in-the-plastids-of-monocots
#12
Xiu-Yue Zhang, Xi Zhang, Qi Zhang, Xiao-Xi Pan, Luo-Chen Yan, Xiao-Juan Ma, Wei-Zhong Zhao, Xiao-Ting Qi, Li-Ping Yin
Iron (Fe)-homeostasis in the plastids is closely associated with Fe transport proteins that prevent Fe from occurring in its toxic free ionic forms. However, the number of known protein families related to Fe transport in the plastids (about 5) and the function of iron in non-green plastids is limited. In the present study, we report the functional characterization of Zea mays Fe deficiency-related 4 (ZmFDR4), which was isolated from a differentially expressed clone of a cDNA library of Fe deficiency-induced maize roots...
January 19, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28102329/leads-in-arctic-pack-ice-enable-early-phytoplankton-blooms-below-snow-covered-sea-ice
#13
Philipp Assmy, Mar Fernández-Méndez, Pedro Duarte, Amelie Meyer, Achim Randelhoff, Christopher J Mundy, Lasse M Olsen, Hanna M Kauko, Allison Bailey, Melissa Chierici, Lana Cohen, Anthony P Doulgeris, Jens K Ehn, Agneta Fransson, Sebastian Gerland, Haakon Hop, Stephen R Hudson, Nick Hughes, Polona Itkin, Geir Johnsen, Jennifer A King, Boris P Koch, Zoe Koenig, Slawomir Kwasniewski, Samuel R Laney, Marcel Nicolaus, Alexey K Pavlov, Christopher M Polashenski, Christine Provost, Anja Rösel, Marthe Sandbu, Gunnar Spreen, Lars H Smedsrud, Arild Sundfjord, Torbjørn Taskjelle, Agnieszka Tatarek, Jozef Wiktor, Penelope M Wagner, Anette Wold, Harald Steen, Mats A Granskog
The Arctic icescape is rapidly transforming from a thicker multiyear ice cover to a thinner and largely seasonal first-year ice cover with significant consequences for Arctic primary production. One critical challenge is to understand how productivity will change within the next decades. Recent studies have reported extensive phytoplankton blooms beneath ponded sea ice during summer, indicating that satellite-based Arctic annual primary production estimates may be significantly underestimated. Here we present a unique time-series of a phytoplankton spring bloom observed beneath snow-covered Arctic pack ice...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101957/summer-co-existence-of-small-sized-cyprinid-and-percid-individuals-in-natural-and-impounded-stretches-of-a-lowland-river-food-niche-partitioning-among-fishes
#14
J Lik, M Dukowska, M Grzybkowska, J Leszczyńska
Due to changes of discharge regime downstream of a dam reservoir, an alluvial natural stretch of the Warta River changed to a macrophyte-dominated ecosystem. Large patches of submersed, aquatic macrophytes appeared in summer and their effect is analysed in this study. These patches contained enriched macroinvertebrate assemblages (epiphyton and benthos) and they were refuge for both zooplankton and young fishes released from the reservoir. Despite these altered conditions in this stretch, roach Rutilus rutilus, perch Perca fluviatilis and ruffe Gymnocephalus cernua dominated, as they did in the natural backwater...
January 18, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28100886/characterization-of-volatile-compounds-with-hs-spme-from-oxidized-n-3-pufa-rich-oils-via-rancimat-tests
#15
Kai-Min Yang, Ming-Ching Cheng, Chih-Wei Chen, Chin-Yin Tseng, Li-Yun Lin, Po-Yuan Chiang
Algae oil and fish oil are n-3 PUFA mainstream commercial products. The various sources for the stability of n-3 PUFA oxidation are influenced by the fatty acid composition, extraction and refined processing. In this study, the oil stability index (OSI) occurs within 2.3 to 7.6 hours with three different n-3 PUFA rich oil. To set the OSI in the Rancimat test as the oil stability limit and observed various degrees of oxidation (0, 25, 50, 75, 100 and 125%). The volatile oxidation compounds were analyzed via headspace-solid phase microextraction (HS-SPME) and GC/MS...
January 18, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28100053/the-grateful-infrared-sequential-protein-structural-changes-resolved-by-infrared-difference-spectroscopy
#16
Tilman Kottke, Víctor A Lórenz-Fonfría, Joachim Heberle
The catalytic activity of proteins is a function of structural changes. Very often these are as minute as protonation changes, hydrogen bonding changes, and amino acid side chain reorientations. To resolve these, a methodology is afforded that not only provides the molecular sensitivity but allows for tracing the sequence of these hierarchical reactions at the same time. This feature article showcases results from time-resolved IR spectroscopy on channelrhodopsin (ChR), light-oxygen-voltage (LOV) domain protein, and cryptochrome (CRY)...
January 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28098790/synthesis-structure-and-antimicrobial-properties-of-novel-benzalkonium-chloride-analogues-with-pyridine-rings
#17
Bogumił Brycki, Izabela Małecka, Anna Koziróg, Anna Otlewska
Quaternary ammonium compounds (QACs) are a group of compounds of great economic significance. They are widely used as emulsifiers, detergents, solubilizers and corrosion inhibitors in household and industrial products. Due to their excellent antimicrobial activity QACs have also gained a special meaning as antimicrobials in hospitals, agriculture and the food industry. The main representatives of the microbiocidal QACs are the benzalkonium chlorides (BACs), which exhibit biocidal activity against most bacteria, fungi, algae and some viruses...
January 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28097050/microbial-communities-mediating-algal-detritus-turnover-under-anaerobic-conditions
#18
Jessica M Morrison, Chelsea L Murphy, Kristina Baker, Richard M Zamor, Steve J Nikolai, Shawn Wilder, Mostafa S Elshahed, Noha H Youssef
BACKGROUND: Algae encompass a wide array of photosynthetic organisms that are ubiquitously distributed in aquatic and terrestrial habitats. Algal species often bloom in aquatic ecosystems, providing a significant autochthonous carbon input to the deeper anoxic layers in stratified water bodies. In addition, various algal species have been touted as promising candidates for anaerobic biogas production from biomass. Surprisingly, in spite of its ecological and economic relevance, the microbial community involved in algal detritus turnover under anaerobic conditions remains largely unexplored...
2017: PeerJ
https://www.readbyqxmd.com/read/28096376/myosin-driven-transport-network-in-plants
#19
Elizabeth G Kurth, Valera V Peremyslov, Hannah L Turner, Kira S Makarova, Jaime Iranzo, Sergei L Mekhedov, Eugene V Koonin, Valerian V Dolja
We investigate the myosin XI-driven transport network in Arabidopsis using protein-protein interaction, subcellular localization, gene knockout, and bioinformatics analyses. The two major groups of nodes in this network are myosins XI and their membrane-anchored receptors (MyoB) that, together, drive endomembrane trafficking and cytoplasmic streaming in the plant cells. The network shows high node connectivity and is dominated by generalists, with a smaller fraction of more specialized myosins and receptors...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28095611/hypothesis-gene-rich-plastid-genomes-in-red-algae-may-be-an-outcome-of-nuclear-genome-reduction
#20
Huan Qiu, Jun Mo Lee, Hwan Su Yoon, Debashish Bhattacharya
Red algae (Rhodophyta) putatively diverged from the eukaryote tree of life >1.2 billion years ago and are the source of plastids in the ecologically important diatoms, haptophytes, and dinoflagellates. In general, red algae contain the largest plastid gene inventory among all such organelles derived from primary, secondary, or additional rounds of endosymbiosis. In contrast, their nuclear gene inventory is reduced when compared to their putative sister lineage, the Viridiplantae, and other photosynthetic lineages...
January 17, 2017: Journal of Phycology
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