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https://www.readbyqxmd.com/read/28441607/toxicity-assessment-of-zno-decorated-au-nanoparticles-in-the-mediterranean-clam-ruditapes-decussatus
#1
Badreddine Sellami, Amine Mezni, Abdelhafidh Khazri, Imen Bouzidi, Wiem Saidani, David Sheehan, Hamouda Beyrem
The synthesis of hybrid nanomaterials has greatly increased in recent years due to their special physical and chemical properties. However, information regarding the environmental toxicity associated with these chemicals is limited, in particular in the aquatic environment. In the present study, an experiment was performed in which the marine bivalve (Ruditapes decussatus) was exposed for 14days to 2 concentrations of zinc oxide-decorated Au nanoparticles (Au-ZnONPs: Au-ZnONP50=50μg/L; Au-ZnONP100=100μg/L)...
April 15, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28441602/fluoride-and-iodine-enrichment-in-groundwater-of-north-china-plain-evidences-from-speciation-analysis-and-geochemical-modeling
#2
Junxia Li, Hailing Zhou, Kun Qian, Xianjun Xie, Xiaobin Xue, Yijun Yang, Yanxin Wang
To better understand the enrichment of fluoride and iodine in groundwater at North China Plain (NCP), speciation analysis and geochemical modeling were conducted to identify the key hydrochemical processes controlling their mobilization in groundwater system. Groundwater fluoride and iodine concentrations ranged from 0.18 to 5.59mg/L and from 1.51 to 1106μg/L, respectively, and approximately 63% and 32.3% of groundwater fluoride and iodine were higher than the guidelines for drinking water (1.5mg/L and 150μg/L)...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28441318/retraction-yu-et-al-low-iron-diet-increases-susceptibility-to-noise-induced-hearing-loss-in-young-rats-nutrients-2016-8-456
#3
Nutrients Editorial Office
The Nutrients Editorial Office has recently been made aware that the figures in the title paper [1] are taken from the same micrographs as those of other papers by the same authors [...].
April 25, 2017: Nutrients
https://www.readbyqxmd.com/read/28441025/structures-interconversions-and-spectroscopy-of-iron-carbonyl-clusters-with-an-interstitial-carbide-localized-metal-center-reduction-by-overall-cluster-oxidation
#4
Subramaniam Kuppuswamy, Joshua D Wofford, Chris Joseph, Zhu-Lin Xie, Azim K Ali, Vincent M Lynch, Paul A Lindahl, Michael J Rose
The syntheses, interconversions, and spectroscopic properties of a set of iron carbonyl clusters containing an interstitial carbide are reported. This includes the low temperature X-ray structures of the six-iron clusters (Y)2[Fe6(μ6-C)(μ2-CO)4(CO)12] (1a-c; where Y = NMe4, NEt4, PPh4); the five-iron cluster [Fe5(μ5-C)(CO)15] (3); and the novel formulation of the five-iron cluster (NMe4)2[Fe5(μ5-C)(μ2-CO)(CO)13] (4). Also included in this set is the novel charge-neutral cluster, [Fe6(μ6-C)(CO)18] (2), for which we were unable to obtain a crystallographic structure...
April 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28440997/-neisseria-meningitidis-a-clinical-case-with-multi-organ-affection
#5
Alejandro Medina-Reyes, Beatriz Díaz-Polanco, Diego Sandoval-Chávez, Manuel Nodal-Hernández, Juan R Ayala-Franco
Neisseria meningitidis (Nm) is an agent feared for decades in the medical field due to its important morbidity and mortality. Ironically between 10 and 15% of the population will be asymptomatic carriers of this germ, which will also be ready to activate and manifest itself as a sickness at the right moment. We present the case of a nine-year-old girl who arrived at the Pediatric Emergency Service (to the Hospital General Region number 35, in Ciudad Juárez, Chihuahua) with the disease in multiple organs, where the Nm was isolated in the cerebrospinal fluid and in skin injuries, displaying three serotypes of Nm...
May 2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28440890/fluorescence-and-autoradiographic-evaluation-of-tau-pet-ligand-pbb3-to-%C3%AE-synuclein-pathology
#6
Shunsuke Koga, Maiko Ono, Naruhiko Sahara, Makoto Higuchi, Dennis W Dickson
BACKGROUND: The tau PET ligand 2-((1E,3E)-4-(6-([(11) C]methylamino)pyridin-3-yl)buta-1,3-dienyl)benzo[d]thiazol-6-ol ([(11) C]PBB3) binds to a wide range of tau pathology; however, binding property of PBB3 to non-tau inclusions remains unknown. To clarify whether [(11) C]PBB3 binds to α-synuclein pathology, reactivity of PBB3 was assessed by in vitro fluorescence and autoradiographic labeling of brain sections from α-synucleinopathies patients. METHOD: Of 10 pure Lewy body disease and 120 multiple system atrophy (MSA) cases in the Mayo Clinic brain bank, we selected 3 Lewy body disease and 4 MSA cases with a range of α-synuclein severity based on the quantitative analysis of α-synuclein burden...
April 25, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28440833/structure-function-studies-of-acinetobactin-analogs
#7
Justin A Shapiro, Timothy A Wencewicz
Pathogenic Acinetobacter baumannii excrete the siderophore pre-acinetobactin as an iron-scavenging virulence factor. Pre-acinetobactin is a 2,3-dihydroxy-phenyl oxazoline that undergoes pH-dependent isomerization to the isooxazolidinone form acinetobactin in order to expand the pH range for iron acquisition by A. baumannii. In this study we establish important structure-function relationships for the kinetics of isomerization, iron(iii) binding, and siderophore utilization by A. baumannii. We showed that electronic properties of the phenyl oxazoline influence isomerization kinetics and iron(iii) binding...
April 25, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28440800/the-trichodesmium-consortium-conserved-heterotrophic-co-occurrence-and-genomic-signatures-of-potential-interactions
#8
Michael D Lee, Nathan G Walworth, Erin L McParland, Fei-Xue Fu, Tracy J Mincer, Naomi M Levine, David A Hutchins, Eric A Webb
The nitrogen (N)-fixing cyanobacterium Trichodesmium is globally distributed in warm, oligotrophic oceans, where it contributes a substantial proportion of new N and fuels primary production. These photoautotrophs form macroscopic colonies that serve as relatively nutrient-rich substrates that are colonized by many other organisms. The nature of these associations may modulate ocean N and carbon (C) cycling, and can offer insights into marine co-evolutionary mechanisms. Here we integrate multiple omics-based and experimental approaches to investigate Trichodesmium-associated bacterial consortia in both laboratory cultures and natural environmental samples...
April 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28440651/iron-catalyzed-acyloxyalkylation-of-styrenes-using-hypervalent-iodine-reagents
#9
Zijia Wang, Motomu Kanai, Yoichiro Kuninobu
Iron-catalyzed acyloxyalkylation of styrene derivatives using hypervalent iodine reagents was achieved. The acyloxyalkylation reaction proceeded using various types of styrenes and hypervalent iodine reagents. The acyloxyalkylated products were obtained in moderate to good yields without loss of the functional groups. The reaction proceeded via the formation of radical species derived from hypervalent iodine reagents by decarboxylation.
April 25, 2017: Organic Letters
https://www.readbyqxmd.com/read/28440645/structural-electronic-and-magnetic-properties-of-iron-disulfide-fens2-0-%C3%A2-n-1-6-clusters
#10
Slimane Tazibt, Aziz Chikhaoui, Said Bouarab, Andres Vega
The structural, electronic and magnetic properties of neutral and charged FenS2(0/±), n=1-6 clusters have been calculated in the framework of the density functional theory in the generalized gradient approximation for the exchange and correlation. The calculated adiabatic electron affinity and the vertical detachment energy are found to be in good agreement with the available experimental data. The impact of disulfide doping of the small iron clusters on the atomic structure, stability, magnetic moment and reactivity is determined through the analysis of the binding energy per atom, electronic charge transfer, spin-polarized electronic density of states and global reactivity indicators like the electronegativity and chemical hardness...
April 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28440618/design-of-antibacterial-polyethersulfone-membranes-via-covalently-attaching-hydrogel-thin-layers-loaded-with-ag-nanoparticles
#11
Min He, Qian Wang, Rui Wang, Yi Xie, Weifeng Zhao, Changsheng Zhao
In order to inhibit the bacteria attachment and the subsequent formation of bio-films on polyethersulfone (PES) membranes, poly(sulfobetaine methacrylate) (PSBMA)/poly(sodium acrylate) (PAANa) antibacterial hydrogel thin layers were covalently attached onto the membranes, followed by loading Ag nanoparticles. In our strategy, double bonds were firstly introduced onto PES membrane surfaces to provide anchoring sites, and then the hydrogel layers were synthesized on the membrane surfaces via UV light initiated cross-linking copolymerization...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440316/modest-and-severe-maternal-iron-deficiency-in-pregnancy-are-associated-with-fetal-anaemia-and-organ-specific-hypoxia-in-rats
#12
Andrew G Woodman, Alison S Care, Yael Mansour, Stephana J Cherak, Sareh Panahi, Ferrante S Gragasin, Stephane L Bourque
Prenatal iron-deficiency (ID) is known to alter fetal developmental trajectories, which predisposes the offspring to chronic disease in later life, although the underlying mechanisms remain unclear. Here, we sought to determine whether varying degrees of maternal anaemia could induce organ-specific patterns of hypoxia in the fetuses. Pregnant female Sprague Dawley rats were fed iron-restricted or iron-replete diets to induce a state of moderate (M-ID) or severe ID (S-ID) alongside respective controls. Ultrasound biomicroscopy was performed on gestational day (GD)20 to assess uterine and umbilical artery blood flow patterns...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440203/antimicrobial-biofilm-inhibitory-and-anti-infective-activity-of-metallic-nanoparticles-against-multi-drug-resistant-mrsa-and-pseudomonas-aeruginosa-pa01
#13
Jamuna Bai Ashwathanarayan, Ravishankar Rai Vittal
BACKGROUND: The emergence of drug resistant pathogens is a major concern to the scientific community. Novel approaches such as the use of functionalized nanomaterials with antimicrobial activity is required to treat infectious diseases. OBJECTIVE: In the present study, the metallic nanoparticles (iron, gold, zinc oxide and copper oxide) were evaluated for the antimicrobial, biofilm inhibitory and anti-infective activity against human pathogens methicillin resistant Staphylococcus aureus and Pseudomonas aeruginosa PA01...
April 24, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28440190/characterization-of-a-novel-polysaccharide-iron-iii-complex-and-its-anti-anemia-and-nonspecific-immune-regulating-activities
#14
Yun Zhang, Fanyi Ma, Jinhua Zhu, Zuliang Du, Yingyong Zhao, Xiuhua Liu
Dioscorea opposita Thunb. is the famous food and traditional medicine in China and it was rich in polysaccharides. Polysaccharides of D. Opposita Thunb. possess immunoregulatory activity, free radical scavenging activity and anti-diabetic activity. A novel polysaccharide-iron(III) complex (CYPIC) was synthesized by using crude polysaccharide extracted from Dioscorea opposita Thunb. The component, structure, morphology and molecular weights of CYPIC were analysed, and the anti-anemia, acute toxicity and nonspecific immune regulating activities of CYPIC were assayed...
April 24, 2017: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/28440111/quality-of-life-outcomes-in-a-pediatric-thalassemia-population-in-egypt
#15
Soheir Adam, Hanan Afifi, Manal Thomas, Phoebe Magdy, Ghada El-Kamah
Thalassemia is a disorder of hemoglobin (Hb) synthesis characterized by chronic hemolysis. In β-thalassemias major (β-TM), patients require regular transfusion at an early age due to severe anemia. Subsequently, intensive chelation therapy is initiated to mitigate the effects of the resultant iron overload. Clinical disease burden and the demanding treatment can affect health-related quality of life (HRQoL) outcomes in this population. The aim of this study was to assess HRQoL outcomes in Egyptian pediatric thalassemia patients...
April 25, 2017: Hemoglobin
https://www.readbyqxmd.com/read/28440014/biomass-derived-n-doped-porous-carbon-supported-single-fe-atoms-as-superior-electrocatalysts-for-oxygen-reduction
#16
Zhengping Zhang, Xinjin Gao, Meiling Dou, Jing Ji, Feng Wang
Exploring sustainable and high-performance electrocatalysts for the oxygen reduction reaction (ORR) is the crucial issue for the large-scale application of fuel cell technology. A new strategy is demonstrated to utilize the biomass resource for the synthesis of N-doped hierarchically porous carbon supported single-atomic Fe (SA-Fe/NHPC) electrocatalyst toward the ORR. Based on the confinement effect of porous carbon and high-coordination natural iron source, SA-Fe/NHPC, derived from the hemin-adsorbed bio-porphyra-carbon by rapid heat-treatment up to 800 °C, presents the atomic dispersion of Fe atoms in the N-doped porous carbon...
April 25, 2017: Small
https://www.readbyqxmd.com/read/28439959/chemical-and-biological-aspects-of-nutritional-immunity-perspectives-for-new-anti-infectives-targeting-iron-uptake-systems
#17
Sabine Laschat, Ursula Bilitewski, Joshua Blodgett, Anne-Kathrin Duhme-Klair, Sabrina Dallavalle, Anne Routledge, Rainer Schobert
Upon bacterial infection one of the defense mechanisms of the host is the withdrawal of essential metal ions, in particular iron leading to "nutritional immunity". However, bacteria have evolved strategies to overcome iron starvation, e.g. by stealing iron from the host or other bacteria by specific iron chelators with high binding affinity. Fortunately, these complex interactions between host and pathogen regarding metal homeostasis provide several opportunities for interception and thus allow the development of novel antibacterials...
April 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28439891/the-new-era-of-chelation-treatments-effectiveness-and-safety-of-10-different-regimens-for-controlling-iron-overloading-in-thalassaemia-major
#18
REVIEW
Rosario Di Maggio, Aurelio Maggio
This review outlines the effectiveness and safety of 10 different regimens for controlling iron overloading in thalassaemia major (TM). For each treatment, the strength of the evidence was documented according to the guidelines of the American College of Cardiology and the American Heart Association. Serum ferritin (SF), liver iron concentration (LIC), heart T2* signal, heart damage and survival were used to assess effectiveness. Five chelation regimens out of 10 showed Level A Evidence in controlling iron overloading, as determined by SF levels and LIC...
April 25, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28439864/long-term-confocal-imaging-of-arabidopsis-thaliana-roots-for-simultaneous-quantification-of-root-growth-and-fluorescent-signals
#19
Delyana Stoeva, Christian Göschl, Bruce Corliss, Wolfgang Busch
Observing cellular and molecular processes in living organisms is key for understanding many important biological processes. Confocal microscopy is excellently suited for this as it enables the observation of molecules and cells in tissue layers of living organisms in three dimensions over time. However, in continuously growing organs, such as plant roots, observations over extended time spans become difficult as the specimen quickly grows out the field of view. Here, we provide a protocol that allows for the acquisition of confocal microscope time-lapse images of root tips spanning many hours, as the growing root tip is tracked and the microscopy is automatized to change the position of the stage...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28439862/automated-high-throughput-root-phenotyping-of-arabidopsis-thaliana-under-nutrient-deficiency-conditions
#20
Santosh B Satbhai, Christian Göschl, Wolfgang Busch
The central question of genetics is how a genotype determines the phenotype of an organism. Genetic mapping approaches are a key for finding answers to this question. In particular, genome-wide association (GWA) studies have been rapidly adopted to study the architecture of complex quantitative traits. This was only possible due to the improvement of high-throughput and low-cost phenotyping methodologies. In this chapter we provide a detailed protocol for obtaining root trait data from the model species Arabidopsis thaliana using the semiautomated, high-throughput phenotyping pipeline BRAT (Busch-lab Root Analysis Toolchain) for early root growth under the stress condition of iron deficiency...
2017: Methods in Molecular Biology
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