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https://www.readbyqxmd.com/read/28735319/intracellular-siderophore-detection-in-an-egyptian-cobalt-treated-f-solani-isolate-using-sem-edx-with-reference-to-its-tolerance
#1
Rasha M Farrag
An Egyptian, plant pathogenic Fusarium solani isolate was grown on cobalt concentrations of 0, 50, 200, 500, 800, and 1000 ppm. The isolate survived concentrations up to 800 ppm, however failed to grow at 1000 ppm. Morphology and elemental analysis of the isolate under the investigated Co concentrations were studied using Scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis (EDX). The isolate reserved its morphology up to a concentration of 200 ppm. Morphological distortions were dramatic at 500 and 800 ppm...
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28735182/fluidized-bed-fenton-coupled-with-ceramic-membrane-separation-for-advanced-treatment-of-flax-wastewater
#2
Dong Fan, Lili Ding, Hui Huang, Mengtian Chen, Hongqiang Ren
Fluidized-bed Fenton coupled with ceramic membrane separation to treat the flax secondary effluent was investigated. The operating variables, including initial pH, dosage of H2O2 and Fe(0), air flow rate, TMP and pore size, were optimized. The distributions of DOMs in the treatment process were analyzed. Under the optimum condition (600mgL(-1)H2O2, 1.4gL(-1) Fe(0), pH=3, 300Lh(-1) air flow rate and 15psi TMP), the highest TOC and color removal efficiencies were 84% and 94% in the coupled reactor with 100nm ceramic membrane, reducing 39% of total iron with similar removal efficiency compared with Fluidized-bed Fenton...
May 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28735157/effects-of-adhesions-of-amorphous-fe-and-al-hydroxides-on-surface-charge-and-adsorption-of-k-and-cd-2-on-rice-roots
#3
Zhao-Dong Liu, Hai-Cui Wang, Qin Zhou, Ren-Kou Xu
Iron (Fe) and aluminum (Al) hydroxides in variable charge soils attached to rice roots may affect surface-charge properties and subsequently the adsorption and uptake of nutrients and toxic metals by the roots. Adhesion of amorphous Fe and Al hydroxides onto rice roots and their effects on zeta potential of roots and adsorption of potassium (K(+)) and cadmium (Cd(2+)) by roots were investigated. Rice roots adsorbed more Al hydroxide than Fe hydroxide because of the greater positive charge on Al hydroxide. Adhesion of Fe and Al hydroxides decreased the negative charge on rice roots, and a greater effect of the Al hydroxide...
July 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28735047/sesamol-exhibits-potent-antimycobacterial-activity-underlying-mechanisms-and-impact-on-virulence-traits
#4
Sandeep Hans, Sharda Sharma, Saif Hameed, Zeeshan Fatima
OBJECTIVES: Novel strategies to overcome multidrug resistance (MDR) in Tuberculosis (TB) still remain a concern. Usage of natural compounds nowadays to surmount the increasing burden of MDR-TB has shown promising results. The aim of this study was to evaluate the antimycobacterial potential of sesamol (Ses) a natural phenolic compound against Mycobacterium smegmatis, a surrogate for MTB and its underlying mechanism of action along with its effect on mycobacterial virulence traits. METHODS: Cell surface phenotypes were estimated microscopically and spectrophotometrically respectively...
July 19, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28734957/effect-of-schwertmannite-and-jarosite-on-the-formation-of-hypoxic-blackwater-during-inundation-of-grass-material
#5
Chamindra L Vithana, Leigh A Sullivan, Troy Shepherd
This study focused on understanding the effect of schwertmannite and jarosite, commonly found in floodplains containing acid sulfate soil materials, on the characteristics of the hypoxic blackwaters that can form when floodplain vegetation experiences prolonged inundation. The formation of these 'blackwaters' was simulated in the laboratory by inundating flood-intolerant pasture grass leaf material in both the presence of schwertmannite/jarosite (schwertmannite and jarosite treatments) minerals and their absence (control treatment) at 27...
July 17, 2017: Water Research
https://www.readbyqxmd.com/read/28732967/ultrasound-assisted-phytosynthesis-of-iron-oxide-nanoparticle
#6
K Sathya, R Saravanathamizhan, G Baskar
The present work deals with the ultrasound assisted green synthesis of iron oxide nano particle using Coriandrum sativum leaf extract as a reducing agent. The synthesized iron oxide nanoparticle was confirmed by UV spectra. The characterization was done to know more about morphology and size of the particle by SEM analysis which shows spherical particles with size ranging from 20 to 90nm. The antimicrobial activity of the leaf extract and the synthesized nanoparticles was studied against the pathogens Micrococcus luteus, Staphylococcus aureus and Aspergillus niger...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732245/interleukin-4-receptor-targeted-delivery-of-bcl-xl-sirna-sensitizes-tumors-to-chemotherapy-and-inhibits-tumor-growth
#7
Padmanaban Guruprasath, Jihoon Kim, Gowri Rangaswamy Gunassekaran, Lianhua Chi, Soyoun Kim, Rang-Woon Park, Sang-Hyun Kim, Moon-Chang Baek, Sang Mun Bae, Sang-Yeob Kim, Dong-Kyu Kim, In-Kyu Park, Won-Jong Kim, Byungheon Lee
IL-4 receptor (IL-4R) is commonly up-regulated on tumor cells, and interactions between the receptor and Interleukin-4 (IL-4) can induce the expression of anti-apoptotic proteins, including Bcl-xL. This contributes to tumor cell survival and their resistance to chemotherapy. In this study, we exploited IL-4R-targeted delivery of Bcl-xL siRNA to IL-4R-expressing tumor cells in order to sensitize them to chemotherapy. To target IL-4R, an IL-4R-binding peptide, IL4RPep-1, was attached to branched polyethyleneimine-superparamagnetic iron oxide nanoparticles (BPEI-SPION)...
July 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28731079/a-polymeric-temozolomide-nanocomposite-against-orthotopic-glioblastoma-xenograft-tumor-specific-homing-directed-by-nestin
#8
Suma Prabhu, Jayant Sastri Goda, Srinivas Mutalik, Bhabani Shankar Mohanty, Pradip Chaudhari, Sharada Rai, Nayanabhirama Udupa, Bola Sadashiva Satish Rao
The development of effective therapeutic strategies for glioblastoma faces challenges such as modulating the blood brain barrier (BBB) for drug influx and selectively targeting tumor cells. Nanocarrier drug delivery strategies are functionalized to enhance vascular permeability. We engineered superparamagnetic iron oxide nanoparticle (SPION) based polymeric nanocomposites (84.37 ± 12.37 nm / 101.56 ± 7.42 nm) embedding temozolomide (TMZ) targeted against glioblastoma by tagging an antibody against nestin, a stem cell marker, and transferrin / polysorbate-80 to permeate the BBB...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730869/impact-of-iron-deficiency-on-exercise-capacity-and-outcome-in-heart-failure-with-reduced-mid-range-and-preserved-ejection-fraction
#9
Pieter Martens, Petra Nijst, Frederik H Verbrugge, Kevin Smeets, Matthias Dupont, Wilfried Mullens
BACKGROUND: Little information is available about the prevalence and impact on exercise capacity and outcome of iron deficiency in heart failure with mid-range (HFmrEF) and preserved (HFpEF) ejection fraction in comparison to heart failure with reduced ejection-fraction (HFrEF). Furthermore, no data is available about the progression of ID in patients without baseline anaemia. METHODS: We evaluated baseline iron and haemoglobin-status in a single-centre, prospective heart failure database...
July 21, 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28728407/effects-of-cooking-method-and-final-core-temperature-on-cooking-loss-lipid-oxidation-nucleotide-related-compounds-and-aroma-volatiles-of-hanwoo-brisket
#10
Dicky Tri Utama, Ki Ho Baek, Hae Seong Jeong, Seok Ki Yoon, Seon-Tea Joo, Sung Ki Lee
Objective: This study was performed to observe the effects of cooking method and final core temperature on cooking loss, lipid oxidation, aroma volatiles, nucleotide-related compounds and aroma volatiles of Hanwoo brisket (deep pectoralis). Methods: Deep pectoralis muscles (8.65% of crude fat) were obtained from three Hanwoo steer carcasses with 1+ quality grade. Samples were either oven-roasted at 180°C (dry heat) or cooked in boiling water (moist heat) to final core temperature of 70°C (medium) or 77°C (well-done)...
July 6, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28727811/factors-limiting-sulfolane-biodegradation-in-contaminated-subarctic-aquifer-substrate
#11
Christopher P Kasanke, Mary Beth Leigh
Sulfolane, a water-soluble organosulfur compound, is used industrially worldwide and is associated with one of the largest contaminated groundwater plumes in the state of Alaska. Despite being widely used, little is understood about the degradation of sulfolane in the environment, especially in cold regions. We conducted aerobic and anaerobic microcosm studies to assess the biological and abiotic sulfolane degradation potential of contaminated subarctic aquifer groundwater and sediment from Interior Alaska...
2017: PloS One
https://www.readbyqxmd.com/read/28726827/nitrogen-reduction-and-functionalization-by-a-multimetallic-uranium-nitride-complex
#12
Marta Falcone, Lucile Chatelain, Rosario Scopelliti, Ivica Živković, Marinella Mazzanti
Molecular nitrogen (N2) is cheap and widely available, but its unreactive nature is a challenge when attempting to functionalize it under mild conditions with other widely available substrates (such as carbon monoxide, CO) to produce value-added compounds. Biological N2 fixation can do this, but the industrial Haber-Bosch process for ammonia production operates under harsh conditions (450 degrees Celsius and 300 bar), even though both processes are thought to involve multimetallic catalytic sites. And although molecular complexes capable of binding and even reducing N2 under mild conditions are known, with co-operativity between metal centres considered crucial for the N2 reduction step, the multimetallic species involved are usually not well defined, and further transformation of N2-binding complexes to achieve N-H or N-C bond formation is rare...
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28726330/synthetic-analogs-of-nitrogenase-metallocofactors-challenges-and-developments
#13
Nathaniel Sickerman, Kazuki Tanifuji, Yilin Hu, Markus Walter Ribbe
Nitrogenase is the only known biological system capable of reducing N2 to NH3, which is a critical component of bioavailable nitrogen fixation. Since the discovery of discrete iron-sulfur metalloclusters within the nitrogenase MoFe protein, synthetic inorganic chemists have sought to reproduce the structural features of these clusters in order to understand how they facilitate the binding, activation and hydrogenation of N2. Through the decades following the initial identification of these clusters, significant progress has been made to synthetically replicate certain compositional and functional aspects of the biogenic clusters...
July 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28724916/involvement-of-the-p62-nrf2-signal-transduction-pathway-on-erythrophagocytosis
#14
Inês B Santarino, Michelle S Viegas, Neuza S Domingues, Ana M Ribeiro, Miguel P Soares, Otília V Vieira
Erythrophagocytosis, the phagocytic removal of damaged red blood cells (RBC), and subsequent phagolysosome biogenesis are important processes in iron/heme metabolism and homeostasis. Phagolysosome biogenesis implies the interaction of nascent phagosomes with endocytic compartments and also autophagy effectors. Here, we report that besides recruitment of microtubule-associated protein-1-light chain 3 (LC3), additional autophagy machinery such as sequestosome 1 (p62) is also acquired by single-membrane phagosomes at very early stages of the phagocytic process and that its acquisition is very important to the outcome of the process...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724290/identifying-and-breaking-scaling-relations-in-molecular-catalysis-of-electrochemical-reactions
#15
Michael L Pegis, Catherine F Wise, Brian Koronkiewicz, James M Mayer
Improving molecular catalysis for important electrochemical PCET reactions, such as the interconversions of H+/H2, O2/H2O, CO2/CO, and N2/NH3, is an ongoing challenge. Synthetic modifications to the molecular catalysts are valuable but often show trade-offs between turnover frequency (TOF) and the effective overpotential required to initiate catalysis (eff). Herein, we derive a new approach for improving efficiencies - higher TOF at lower eff - by changing the concentrations and properties of the reactants and products, rather than by modifying the catalyst...
July 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28724096/hydrology-and-soil-manipulations-of-iron-rich-ditch-mesocosms-provide-little-evidence-of-phosphorus-capture-within-the-profile
#16
David E Ruppert, Brian A Needelman, Peter J A Kleinman, Martin C Rabenhorst, Bahram Momen, David B Wester
Agricultural drainage ditches function as first-order streams and affect nutrient management. Soil mesocosms from a ditch featuring a vertical (increasing upward) gradient in iron (Fe) and phosphorus (P) were subjected to hydraulic and soil treatments. These manipulations mimicked aspects of dredging and controlled drainage and inspected the soil release and retention of P. Treatments did not remove P from simulated groundwater. Throughput water either gained in P (lack of dredging, especially under Fe-reducing conditions) or had P concentrations indistinguishable from input water (dredging)...
May 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28723895/visible-light-driven-methane-formation-from-co2-with-a-molecular-iron-catalyst
#17
Heng Rao, Luciana C Schmidt, Julien Bonin, Marc Robert
Converting CO2 into fuel or chemical feedstock compounds could in principle reduce fossil fuel consumption and climate-changing CO2 emissions. One strategy aims for electrochemical conversions powered by electricity from renewable sources, but photochemical approaches driven by sunlight are also conceivable. A considerable challenge in both approaches is the development of efficient and selective catalysts, ideally based on cheap and Earth-abundant elements rather than expensive precious metals. Of the molecular photo- and electrocatalysts reported, only a few catalysts are stable and selective for CO2 reduction; moreover, these catalysts produce primarily CO or HCOOH, and catalysts capable of generating even low to moderate yields of highly reduced hydrocarbons remain rare...
July 17, 2017: Nature
https://www.readbyqxmd.com/read/28723082/mixed-valency-in-a-3d-semiconducting-iron-fluoranilate-coordination-polymer
#18
Ryuichi Murase, Brendan F Abrahams, Deanna M D'Alessandro, Casey G Davies, Timothy A Hudson, Guy N L Jameson, Boujemaa Moubaraki, Keith S Murray, Richard Robson, Ashley L Sutton
A pair of coordination polymers of composition (NBu4)2[M2(fan)3] (fan = fluoranilate; M = Fe and Zn) were synthesized and structurally characterized. In each case the compound consists of a pair of interpenetrating three-dimensional, (10,3)-a networks in which metal centers are linked by chelating/bridging fluoranilate ligands. Tetrabutylammonium cations are located in the spaces between the two networks. Despite the structural similarity, significant differences exist between (NBu4)2[Fe2(fan)3] and (NBu4)2[Zn2(fan)3] with respect to the oxidation states of the metal centers and ligands...
July 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28722538/dispersed-synthesis-of-uniform-fe3o4-magnetic-nanoparticles-via-in-situ-decomposition-of-iron-precursor-along-cotton-fiber-for-sudan-dyes-analysis-in-food-samples
#19
Yassine Bentahir, Said Elmarhoum, Rachid Salghi, Manuel Algarra, Angel Ríos, Mohammed Zougagh
Fe3O4 magnetic nanoparticles, with a negative charge surface, are known to have efficient adsorbent properties, but they tend to be agglomerated into larger aggregates or flocs, which can cause loss of specific area. The addition of cotton fiber, as a stabilizer in preparation of the Fe3O4 nanoparticles, is able to efficiently reduce particle aggregation, and thus, effective particle size, resulting in much greater specific surface area and adsorption sites. Fe3O4 nanoparticles synthesis was accomplished by in-situ high temperature decomposition of the precursor ferric ion in the presence of cotton fiber and ethylene glycol solvent...
July 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28721756/lycopene-ameliorates-experimental-colitis-in-rats-via-reducing-apoptosis-and-oxidative-stress
#20
Burcu Gul Baykalir, Dilek Aksit, Mustafa Selim Dogru, Arzu Hanım Yay, Hasan Aksit, Kamil Seyrek, Ahmet Attesahin
Inflammatory bowel disease (IBD) is an inflammatory disorder involving colitis. Lycopene is a naturally occurring carotenoid that has attracted considerable attention as a potential chemopreventive agent. The impact of lycopene on colitis is currently unknown. The aim of this study was to investigate the protective effects of lycopene in a rat model of colitis induced by acetic acid. The animals were randomly divided into the following five groups: the control group, colitis group, colitis + sulfasalazine group as a positive control group, colitis + lycopene and lycopene groups...
July 19, 2017: International Journal for Vitamin and Nutrition Research. Journal International de Vitaminologie et de Nutrition
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