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https://www.readbyqxmd.com/read/28106856/green-synthesis-and-characterization-of-palladium-nanoparticles-using-origanum-vulgare-l-extract-and-their-catalytic-activity
#1
Mohammed Rafi Shaik, Zuhur Jameel Qandeel Ali, Mujeeb Khan, Mufsir Kuniyil, Mohamed E Assal, Hamad Z Alkhathlan, Abdulrahman Al-Warthan, Mohammed Rafiq H Siddiqui, Merajuddin Khan, Syed Farooq Adil
The synthesis of Palladium (Pd) nanoparticles by green methods has attracted remarkable attention in recent years because of its superiority above chemical approaches, owing to its low cost and ecological compatibility. In this present work, we describe a facile and environmentally friendly synthesis of Pd nanoparticles (Pd NPs) using an aqueous extract of aerial parts of Origanum vulgare L. (OV) as a bioreductant. This plant is available in many parts of the world as well as in Saudi Arabia and is known to be a rich source of phenolic components, a feature we fruitfully utilized in the synthesis of Pd NPs, using various concentrations of plant extracts...
January 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28097070/sponge-exhalent-seawater-contains-a-unique-chemical-profile-of-dissolved-organic-matter
#2
Cara L Fiore, Christopher J Freeman, Elizabeth B Kujawinski
Sponges are efficient filter feeders, removing significant portions of particulate and dissolved organic matter (POM, DOM) from the water column. While the assimilation and respiration of POM and DOM by sponges and their abundant microbial symbiont communities have received much attention, there is virtually no information on the impact of sponge holobiont metabolism on the composition of DOM at a molecular-level. We applied untargeted and targeted metabolomics techniques to characterize DOM in seawater samples prior to entering the sponge (inhalant reef water), in samples exiting the sponge (exhalent seawater), and in samples collected just outside the reef area (off reef seawater)...
2017: PeerJ
https://www.readbyqxmd.com/read/28095496/opportunities-for-integrated-ecological-analysis-across-inland-australia-with-standardised-data-from-ausplots-rangelands
#3
Greg R Guerin, Ben Sparrow, Andrew Tokmakoff, Anita Smyth, Emrys Leitch, Zdravko Baruch, Andrew J Lowe
Australian rangelands ecosystems cover 81% of the continent but are understudied and continental-scale research has been limited in part by a lack of precise data that are standardised between jurisdictions. We present a new dataset from AusPlots Rangelands that enables integrative rangelands analysis due to its geographic scope and standardised methodology. The method provides data on vegetation and soils, enabling comparison of a suite of metrics including fractional vegetation cover, basal area, and species richness, diversity, and composition...
2017: PloS One
https://www.readbyqxmd.com/read/28094795/impacts-of-chemical-gradients-on-microbial-community-structure
#4
Jianwei Chen, Anna Hanke, Halina E Tegetmeyer, Ines Kattelmann, Ritin Sharma, Emmo Hamann, Theresa Hargesheimer, Beate Kraft, Sabine Lenk, Jeanine S Geelhoed, Robert L Hettich, Marc Strous
Succession of redox processes is sometimes assumed to define a basic microbial community structure for ecosystems with oxygen gradients. In this paradigm, aerobic respiration, denitrification, fermentation and sulfate reduction proceed in a thermodynamically determined order, known as the 'redox tower'. Here, we investigated whether redox sorting of microbial processes explains microbial community structure at low-oxygen concentrations. We subjected a diverse microbial community sampled from a coastal marine sediment to 100 days of tidal cycling in a laboratory chemostat...
January 17, 2017: ISME Journal
https://www.readbyqxmd.com/read/28092425/chemical-composition-of-the-essential-oil-of-nigeria-grown-hoslundia-opposita-vahl-lamiaceae-dried-leaves-and-its-bioactivity-against-cowpea-seed-bruchid
#5
Samuel Adelani Babarinde, Olufemi Olutoyin Richard Pitan, Ganiyu Olatunji Olatunde, Michael Oluwole Ajala
Due to several ecological and human hazards of synthetic pesticides in postharvest crop protection, there is the need to search for eco-friendly alternatives. In this study, chemical composition and insecticidal activities of essential oil (EO) obtained from Hoslundia opposita dried leaves were evaluated against cowpea seed bruchid. Eight constituents, predominated by oxygenated monoterpenes (78.86%), were identified using GC-MS. The constituents were 1,8-cineole (1; 61.15%), followed by α-terpineol (2; 16...
January 16, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28091988/genotoxicity-and-cytotoxicity-reduction-of-the-polluted-urban-river-after-ecological-restoration-a-field-scale-study-of-jialu-river-in-northern-china
#6
Jie Sun, Rui Zhang, Long Qin, Haixiao Zhu, Yu Huang, Yingang Xue, Shuqing An, Xianchuan Xie, Aimin Li
To further treat the reclaimed municipal wastewater and rehabilitate the aquatic ecosystem of polluted urban rivers, an 18.5-km field-scale ecological restoration project was constructed along Jialu River, a polluted urban river which receives only reclaimed municipal wastewater from Zhengzhou City without natural upland water dilution. This study investigated the potential efficiency of water quality improvement, as well as genotoxicity and cytotoxicity reduction along the ecological restoration project of this polluted urban river...
January 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091935/natural-products-from-photorhabdus-and-other-entomopathogenic-bacteria
#7
Kenan A J Bozhüyük, Qiuqin Zhou, Yvonne Engel, Antje Heinrich, Alexander Pérez, Helge B Bode
Although the first natural products (NP) from Photorhabdus and Xenorhabdus bacteria have been known now for almost 30 years, a huge variety of new compounds have been identified in the last 5-10 years, mainly due to the application of modern mass spectrometry. Additionally, application of molecular methods that allow the activation of NP production in several different strains as well as efficient heterologous expression methods have led to the production and validation of many new compounds. In this chapter we discuss the benefit of using Photorhabdus as a model system for microbial chemical ecology...
January 4, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28089211/toxicity-effects-of-an-environmental-realistic-herbicide-mixture-on-the-seagrass-zostera-noltei
#8
Noël J Diepens, Evelyne Buffan-Dubau, Hélène Budzinski, Jean Kallerhoff, Georges Merlina, Jérome Silvestre, Isabelle Auby, Nathalie Tapie, Arnaud Elger
Worldwide seagrass declines have been observed due to multiple stressors. One of them is the mixture of pesticides used in intensive agriculture and boat antifouling paints in coastal areas. Effects of mixture toxicity are complex and poorly understood. However, consideration of mixture toxicity is more realistic and ecologically relevant for environmental risk assessment (ERA). The first aim of this study was to determine short-term effects of realistic herbicide mixture exposure on physiological endpoints of Zostera noltei...
January 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28089047/cypome-of-the-conifer-pathogen-heterobasidion-irregulare-inventory-phylogeny-and-transcriptional-analysis-of-the-response-to-biocontrol
#9
Anthony C Mgbeahuruike, Andriy Kovalchuk, Wimal Ubhayasekera, David R Nelson, Jagjit S Yadav
The molecular mechanisms underlying the interaction of the pathogen, Heterobasidion annosum s.l., the conifer tree and the biocontrol fungus, Phlebiopsis gigantea have not been fully elucidated. Members of the cytochrome P450 (CYP) protein family may contribute to the detoxification of components of chemical defence of conifer trees by H. annosum during infection. Additionally, they may also be involved in the interaction between H. annosum and P. gigantea. A genome-wide analysis of CYPs in Heterobasidion irregulare was carried out alongside gene expression studies...
February 2017: Fungal Biology
https://www.readbyqxmd.com/read/28087942/the-mutualistic-interaction-between-plants-and-arbuscular-mycorrhizal-fungi
#10
Luisa Lanfranco, Paola Bonfante, Andrea Genre
Mycorrhizal fungi belong to several taxa and develop mutualistic symbiotic associations with over 90% of all plant species, from liverworts to angiosperms. While descriptive approaches have dominated the initial studies of these fascinating symbioses, the advent of molecular biology, live cell imaging, and "omics" techniques have provided new and powerful tools to decipher the cellular and molecular mechanisms that rule mutualistic plant-fungus interactions. In this article we focus on the most common mycorrhizal association, arbuscular mycorrhiza (AM), which is formed by a group of soil fungi belonging to Glomeromycota...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087920/spatial-and-temporal-variation-of-water-quality-in-the-bertam-catchment-cameron-highlands-malaysia
#11
G Rasul
The spatio-temporal variability of water quality associated with anthropogenic activities was studied for the Bertam River and its main tributaries within the Bertam Catchment, Cameron Highlands, Malaysia. A number of physico-chemical parameters of collected samples were analyzed to evaluate their spatio-temporal variability. Non-parametric statistical analysis showed significant temporal and spatial differences (p<0.05) in most of the parameters across the Catchment. Parameters except DO and COD displayed higher values in rainy season...
December 16, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28073772/a-water-availability-gradient-reveals-the-deficit-level-required-to-affect-traits-in-potted-juvenile-eucalyptus-globulus
#12
Adam B McKiernan, Brad M Potts, Mark J Hovenden, Timothy J Brodribb, Noel W Davies, Thomas Rodemann, Scott A M McAdam, Julianne M O'Reilly-Wapstra
BACKGROUND AND AIMS: Drought leading to soil water deficit can have severe impacts on plants. Water deficit may lead to plant water stress and affect growth and chemical traits. Plant secondary metabolite (PSM) responses to water deficit vary between compounds and studies, with inconsistent reports of changes to PSM concentrations even within a single species. This disparity may result from experimental water deficit variation among studies, and so multiple water deficit treatments are used to fully assess PSM responses in a single species...
January 10, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28073469/effect-of-the-toxin-microcystin-content-of-microcystis-on-copepod-grazing
#13
Kemal Ali Ger, Elisabeth J Faassen, Maria Grazia Pennino, Miquel Lürling
Although phytoplankton chemical defense may regulate plankton dynamics, demonstrating an ecologically relevant anti-grazer cue is challenging. Presented here is a novel approach to evaluate the quantitative effect of microcystin (MC), the most studied group of cyanobacterial metabolites, on grazing by the common copepod Eudiaptomus gracilis. A temperature-induced gradient in the intracellular MC concentration of three different Microcystis strains enabled the comparison of grazing pressure on cells of the same cyanobacterial strain producing different amounts of MC, in a diet with alternative food (Chlamydomonas)...
February 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073441/applied-simulations-and-integrated-modelling-for-the-understanding-of-toxic-and-harmful-algal-blooms-asimuth-integrated-hab-forecast-systems-for-europe-s-atlantic-arc
#14
Julie Maguire, Caroline Cusack, Manuel Ruiz-Villarreal, Joe Silke, Deirdre McElligott, Keith Davidson
Reasons for the emergent interest in HABs are abundant, including concerns associated with human health, adverse effects on biological resources, economic losses attributed to recreation, tourism and seafood related industries, and the cost of maintaining public advisory services and monitoring programs for shellfish toxins and water quality. The impact of HABs can potentially be mitigated by early warning of their development. In this regard the project ASIMUTH (Applied Simulations and Integrated Modelling for the Understanding of Toxic and Harmful algal blooms) was borne in order to develop short term HAB alert systems for Atlantic Europe...
March 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073253/harnessing-insect-microbe-chemical-communications-to-control-insect-pests-of-agricultural-systems
#15
John J Beck, Rachel L Vannette
Insect pests cause serious economic, yield, and food safety problems to managed crops worldwide. Compounding these problems, insect pests often vector pathogenic or toxigenic microbes to plants. Previous work has considered plant-insect and plant-microbe interactions separately. Although insects are well-understood to use plant volatiles to locate hosts, microorganisms can produce distinct and abundant volatile compounds that in some cases strongly attract insects. In this paper, we focus on the microbial contribution to plant volatile blends, highlighting the compounds emitted and the potential for variation in microbial emission...
January 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28068492/enzyme-based-strategies-for-structuring-foods-for-improved-functionality
#16
Benjamin Zeeb, David Julian McClements, Jochen Weiss
Enzyme technologies can be used to create food dispersions with novel functional attributes using structural design principles. Enzymes that utilize foodgrade proteins and/or polysaccharides as substrates have gained recent interest among food scientists. The utilization of enzymes for structuring foods is an ecologically and economically viable alternative to the utilization of chemical cross-linking and depolymerization agents. This review highlights recent progress in the use of enzymes to modify food structure, particularly the interfacial and/or bulk properties of food dispersions with special emphasis on commercially available enzymes...
January 4, 2017: Annual Review of Food Science and Technology
https://www.readbyqxmd.com/read/28068401/advantages-of-synthetic-noise-and-machine-learning-for-analyzing-radioecological-data-sets
#17
Igor Shuryak
The ecological effects of accidental or malicious radioactive contamination are insufficiently understood because of the hazards and difficulties associated with conducting studies in radioactively-polluted areas. Data sets from severely contaminated locations can therefore be small. Moreover, many potentially important factors, such as soil concentrations of toxic chemicals, pH, and temperature, can be correlated with radiation levels and with each other. In such situations, commonly-used statistical techniques like generalized linear models (GLMs) may not be able to provide useful information about how radiation and/or these other variables affect the outcome (e...
2017: PloS One
https://www.readbyqxmd.com/read/28066690/high-power-365-nm-uv-led-mercury-arc-lamp-replacement-for-photochemistry-and-chemical-photolithography
#18
K Hölz, J Lietard, M M Somoza
Ultraviolet light emitting diodes (UV LEDs) have become widespread in chemical research as highly efficient light sources for photochemistry and photopolymerization. However, in more complex experimental setups requiring highly concentrated light and highly spatially resolved patterning of the light, high-pressure mercury arc lamps are still widely used because they emit intense UV light from a compact arc volume that can be efficiently coupled into optical systems. Advances in the deposition and p-type doping of gallium nitride have recently permitted the manufacture of UV LEDs capable of replacing mercury arc lamps also in these applications...
January 3, 2017: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/28054270/breaking-from-tradition-establishing-more-realistic-sediment-quality-guidelines
#19
G Allen Burton
Sediment quality guidelines vary wildly across nations. The approaches to derive these guidelines range from crude percentile rankings of total concentrations of single chemicals to theoretical approaches that are driven by biological available effect levels. This results in a range of orders of magnitude for "safe" or threshold levels by chemical. Even the more scientifically advanced approaches using theoretical approaches are problematic in that they do not consider chemical mixtures, alternate routes of exposure, and other ligands that limit bioavailability...
January 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28049354/the-life-course-model-as-a-framework-for-post-conflict-health-analysis-reflections-on-the-gulf-war-critical-period
#20
Charles W Cange
In the Kuwait context, from January 1991 to December 1991, there were a series of chemical and psychological Gulf War-era exposures that left persistent, long-term damage. Extreme stress from a critical event speeds up the usual disease latency period, and may be part of a synergistic effect that leads to higher disease rates over a shorter period of time. I am interested in the impact of armed conflict on health outcomes over the life course in Kuwait, and particularly the pathways through which armed conflict causes changes in health on a population level...
January 3, 2017: Medicine, Conflict, and Survival
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