keyword
MENU ▼
Read by QxMD icon Read
search

iron reducing

keyword
https://www.readbyqxmd.com/read/28646748/the-influence-of-iron-oxide-nanoparticles-upon-the-adsorption-of-organic-matter-on-magnetic-powdered-activated-carbon
#1
Kim Maren Lompe, David Menard, Benoit Barbeau
Combining powdered activated carbon (PAC) with magnetic iron oxides has been proposed in the past to produce adsorbents for natural organic matter (NOM) removal that can be easily separated using a magnetic field. However, the trade-off between the iron oxides' benefits and the reduced carbon content, porosity, and surface area has not yet been investigated systematically. We produced 3 magnetic powdered activated carbons (MPAC) with mass fractions of 10%, 38% and 54% maghemite nanoparticles and compared them to bare PAC and pure nanoparticles with respect to NOM adsorption kinetics and isotherms...
June 17, 2017: Water Research
https://www.readbyqxmd.com/read/28646718/reduced-graphene-oxide-functionalized-feooh-for-signal-on-photoelectrochemical-sensing-of-prostate-specific-antigen-with-bioresponsive-controlled-release-system
#2
Qian Zhou, Youxiu Lin, Jian Shu, Kangyao Zhang, Zhenzhong Yu, Dianping Tang
A new and signal-on photoelectrochemical (PEC) sensing platform was successfully designed for the sensitive detection of prostate-specific antigen (PSA), using reduced graphene oxide- functionalized iron oxyhydroxide (FeOOH-rGO) as the photoactive material, accompanying target-responsive controlled release system to achieve the signal amplification. Introduction of rGO as electron mediator greatly facilitated the electron transfer from FeOOH to electrode under visible light, which inhibited the electron-hole recombination to enhance the photo-activity of FeOOH-rGO...
June 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28646111/a-bacillus-paralicheniformis-iron-containing-urease-reduces-urea-concentrations-in-rice-wine
#3
Qingtao Liu, Yuqi Chen, Minglai Yuan, Guocheng Du, Jian Chen, Zhen Kang
Urease, as a nickel-containing metalloenzyme, was the first enzyme to be crystallized, and it has a prominent position in the history of biochemistry. In the present study, we identified a nickel urease gene cluster, ureABCEFGDH, from Bacillus paralicheniformis ATCC 9945a and characterized it in Escherichia coli Enzymatic assays demonstrate that this oxygen-stable urease is also an iron-containing acid urease. UreH heterologous expression assays suggest that this accessory protein is involved in transmembrane transportation of nickel and iron ions...
June 23, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28643695/highly-fluorescent-and-superparamagnetic-nanosystem-for-biomedical-applications
#4
Mariana P Cabrera, Paulo E Cabral Filho, Camila M C M Silva, Rita M Oliveira, Carlos F G C Geraldes, M Margarida C A Castro, Benilde F O Costa, Marta S C Henriques, José A Paixão, Luiz B Carvalho, Beate S Santos, Fernando Hallwass, Adriana Fontes, Giovannia A L Pereira
This work reports on highly fluorescent and superparamagnetic bimodal nanoparticles (BNPs) obtained by a simple and efficient method as probes for fluorescence analysis and/or contrast agents for MRI. These promising BNPs with small dimensions (ca. 17 nm) consist of superparamagnetic iron oxide nanoparticles (SPIONs) covalently bound with CdTe quantum dots (ca. 3 nm). The chemical structure of the magnetic part of BNPs is predominantly magnetite, with minor goethite and maghemite contributions, as shown by Mössbauer spectroscopy, which is compatible with the x-ray diffraction data...
July 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28643693/generation-mechanism-of-negative-permittivity-and-kramers-kronig-relations-in-batio-sub-3-sub-y-sub-3-sub-fe-sub-5-sub-o-sub-12-sub-multiferroic-composites
#5
Zhongyang Wang, Kai Sun, Peitao Xie, Yao Liu, Runhua Fan
Recently, negative parameters such as negative permittivity and negative permeability are attracting extensive attention for their unique electromagnetic properties. Usually, negative permittivity is well achieved by plasma oscillation of free electrons in conductor-insulator composites or metamaterials, while some attention has been drawn to attaining the negative permittivity in ceramics to reduce the dielectric loss. In this paper, negative permittivity in barium titanate and yttrium iron garnet composites was reported which was well fitted by Lorentz model...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28643569/iron-overload-directly-affecting-the-ovaries-in-a-patient-with-diamond-blackfan-anaemia-a-case-report
#6
Mariano Mascarenhas, Victoria Rawnsley, Adam Balen
Iron is a 'one-way' element and the primary point of regulation of body iron stores is at the level of intestinal iron absorption. Repeated blood transfusions for congenital anaemias bypass this regulatory checkpoint and inevitably lead to iron overload in the long-term. Iron overload causes multi-organ dysfunction of the heart, liver, pancreas and joints. It also causes reproductive toxicity primarily through its damaging effect on the anterior pituitary leading to hypogonadotrophic hypogonadism. Another less understood mechanism of reproductive toxicity is direct gonadal damage of excess free iron...
June 23, 2017: Human Fertility: Journal of the British Fertility Society
https://www.readbyqxmd.com/read/28642463/acute-loss-of-the-hepatic-endo-lysosomal-system-in-vivo-causes-compensatory-changes-in-iron-homeostasis
#7
Christoph Metzendorf, Anja Zeigerer, Sarah Seifert, Richard Sparla, Bahar Najafi, François Canonne-Hergaux, Marino Zerial, Martina U Muckenthaler
Liver cells communicate with the extracellular environment to take up nutrients via endocytosis. Iron uptake is essential for metabolic activities and cell homeostasis. Here, we investigated the role of the endocytic system for maintaining iron homeostasis. We specifically depleted the small GTPase Rab5 in the mouse liver, causing a transient loss of the entire endo-lysosomal system. Strikingly, endosome depletion led to a fast reduction of hepatic iron levels, which was preceded by an increased abundance of the iron exporter ferroportin...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642370/in-vitro-cytochrome-p450-46a1-cyp46a1-activation-by-neuroactive-compounds
#8
Natalia Mast, Kyle W Anderson, Kevin M Johnson, Thanh T N Phan, F Peter Guengerich, Irina A Pikuleva
Cytochrome P450 46A1 (CYP46A1, cholesterol 24-hydroxylase) is the enzyme responsible for the majority of cholesterol elimination from the brain. Previously, we found that the anti-HIV drug efavirenz (EFV) can pharmacologically activate CYP46A1 in mice. Herein, we investigated whether CYP46A1 could also be activated by endogenous compounds, including major neurotransmitters. In vitro experiments with purified recombinant CYP46A1 indicated that CYP46A1 is activated by L-glutamate (L-Glu), L-aspartate, γ-aminobutyric acid, and acetylcholine, with L-Glu eliciting the highest increase (3-fold) in CYP46A1-mediated cholesterol 24-hydroxylation...
June 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28639020/investigation-of-the-removal-mechanism-of-cr-vi-in-groundwater-using-activated-carbon-and-cast-iron-combined-system
#9
Dandan Huang, Guangcai Wang, Zhihong Li, Fei Kang, Fei Liu
Zero-valent iron (Fe(0)) has been widely used for Cr(VI) removal; however, the removal mechanisms of Cr(VI) from aqueous solution under complex hydrogeochemical conditions were poorly understood. In this research, the mixed materials containing cast iron and activated carbon were packed in columns for the treatment of aqueous Cr(VI)-Cr(III) in groundwater with high concentration of Ca(2+), Mg(2+), HCO3(-), NO3(-), and SO4(2-). We investigate the influences of those ions on Cr(VI) removal, especially emphasizing on the reaction mechanisms and associated precipitations which may lead to porosity loss by using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) techniques...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28638917/influence-of-sodium-nitroprusside-on-expressions-of-fbxl5-and-irp2-in-sh-sy5y-cells
#10
Jie Wei, Yong Li, Qian Jiao, Xi-Xun DU, Hong Jiang
Iron accumulation in the brain is associated with the pathogenesis of Parkinson's disease (PD). Misexpression of some iron transport and storage proteins is related to iron dyshomeostasis. Iron regulatory proteins (IRPs) including IRP1 and IRP2 are cytosolic proteins that play important roles in maintaining cellular iron homeostasis. F-box and leucine-rich repeat protein 5 (FBXL5) is involved in the regulation of iron metabolism by degrading IRP2 through the ubiquitin-proteasome system. Nitric oxide (NO) enhances the binding activity of IRP1, but its effect on IRP2 is ambiguous...
June 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28637830/a-light-harvesting-complex-like-protein-in-maintenance-of-photosynthetic-components-in-chlamydomonas
#11
Lei Zhao, Dongmei Cheng, Xiahe Huang, Mei Chen, Luca Dall'Osto, Jiale Xing, Liyan Gao, Lingyu Li, Yale Wang, Roberto Bassi, Lianwei Peng, Yingchun Wang, Jean-David Rochaix, Fang Huang
Using a genetic approach we have identified and characterized a novel protein, named Msf1 (Maintenance Factor for PSI), which is required for the maintenance of specific components of the photosynthetic apparatus in the green alga Chlamydomonas reinhardtii. Msf1 belongs to the superfamily of light-harvesting complex (LHC) proteins with three trans-membrane domains and consensus chlorophyll binding sites. Loss of Msf1 leads to reduced accumulation of PSI and chlorophyll-binding proteins/complexes. Msf1 is a component of a thylakoid complex containing key enzymes of the tetrapyrrole biosynthetic pathway thus revealing a possible link between Msf1 and chlorophyll biosynthesis...
June 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28636310/sensing-mechanisms-in-the-redox-regulated-2fe-2s-cluster-containing-bacterial-transcriptional-factor-soxr
#12
Kazuo Kobayashi
Bacteria possess molecular biosensors that enable responses to a variety of stressful conditions, including oxidative stress, toxic compounds, and interactions with other organisms, through elaborately coordinated regulation of gene expression. In Escherichia coli and related bacteria, the transcription factor SoxR functions as a sensor of oxidative stress and nitric oxide (NO). SoxR protein contains a [2Fe-2S] cluster essential for its transcription-enhancing activity, which is regulated by redox changes in the [2Fe-2S] cluster...
June 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28635132/the-fabrication-of-iron-oxide-nanoparticle-nanofiber-composites-by-electrospinning-and-their-applications-in-tissue-engineering
#13
REVIEW
Chris J Mortimer, Chris J Wright
This paper reviews the use of iron oxide nanoparticle-nanofiber composites in tissue engineering with a focus on the electrospinning technique. Electrospinning is an established method of scaffold fabrication offering a number of key advantages which include its facile nature, with electrospun materials offering a high surface area to volume ratio, potential for the release of drugs and antimicrobials, controllable fiber diameters and high porosity and permeability. A number of different techniques for the preparation of iron oxide nanoparticles including their functionalization are discussed along with their applications in the biomedical field...
June 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28633872/frozen-yogurt-and-ice-cream-were-less-healthy-than-yogurt-and-adding-toppings-reduced-their-nutrition-value-evidence-from-1999-2014-national-health-and-nutrition-examination-survey
#14
Ruopeng An, Ning Jiang
It was hypothesized that frozen yogurt and ice cream would be less healthy than yogurt. We examined daily energy and nutrient intake from yogurt, frozen yogurt, and ice cream among US adults. In-person 24-hour dietary recall data (n=6453) came from the 1999-2014 National Health and Nutrition Examination Survey. Regression analyses were performed to examine the differences in energy/nutrient intake from frozen yogurt and ice cream (with/without toppings) in comparison to yogurt. Approximately 5.3%, 0.9%, and 14...
June 2017: Nutrition Research
https://www.readbyqxmd.com/read/28632986/atom-probe-tomography-unveils-formation-mechanisms-of-wear-protective-tribofilms-by-zddp-ionic-liquid-and-their-combination
#15
Wei Guo, Yan Zhou, Xiahan Sang, Donovan N Leonard, Jun Qu, Jonathan D Poplawsky
The development of advanced lubricant additives has been a critical component for in paving the way for increasing energy efficiency and durability for numerous industry applications. However, the formation mechanisms of additive-induced protective tribofilms are not yet fully understood due to the complex chemomechanical interactions at the contact interface and the limited spatial resolution of many characterizing techniques currently used. Here, the tribofilms on a grey cast iron surface formed by three antiwear additives are systematically studied; a phosphonium-phosphate ionic liquid (IL), a zinc dialkyldithiophosphate (ZDDP), and an IL+ZDDP combination...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632501/evaluation-of-automatic-dose-rate-control-for-flat-panel-imaging-using-a-spatial-frequency-domain-figure-of-merit
#16
Michiel Dehairs, Hilde Bosmans, Walter Desmet, Nicholas W Marshall
Current automatic dose rate controls (ADRCs) of dynamic x-ray imaging systems adjust acquisition parameters in response to changes in patient thickness in order to achieve a constant signal level in the image receptor. This work compares a 3 parameter (3P) ADRC control to a more flexible 5-parameter (5P) method to meet this goal. A phantom composed of 15 composite poly(methyl) methacrylate (PMMA)/aluminium (Al) plates was imaged on a Siemens Artis Q dynamic system using standard 3P and 5P ADRC technique. Phantom thickness covered a water equivalent thickness range of 2...
June 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28632387/poly-trehalose-nanoparticle-prevents-amyloid-aggregation-and-suppress-polyglutamine-aggregation-in-huntington-s-disease-model-mouse
#17
Koushik Debnath, Nibedita Pradhan, Brijesh Kumar Singh, Nihar R Jana, Nikhil R Jana
Prevention and therapeutic strategy of various neurodegenerative disease focus on inhibiting protein fibrillation, clearing of aggregated protein plaques from brain and lowering of protein aggregate-induced toxicity. We have designed poly(trehalose) nanoparticle that can inhibit amyloid/polyglutamine aggregation under extra-/intra-cellular condition, reduce such aggregation-derived cytotoxicity and prevents polyglutamine aggregation in Huntington's disease (HD) model mouse brain. Nanoparticle has 20-30 nm hydrodynamic size, composed of 6 nm iron oxide core and zwitterionic polymer shell with covalently linked trehalose of ~5-12 wt %...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632119/alkaliphilus-namsaraevii-sp-nov-an-alkaliphilic-iron-and-sulfur-reducing-bacterium-isolated-from-a-steppe-soda-lake
#18
Anastasiya Zakharyuk, Lyudmila Kozyreva, Elena Ariskina, Olga Troshina, Dmitry Kopitsyn, Viktoria Shcherbakova
A novel alkaliphilic spore-forming bacterium was isolated from the benthic sediments of the highly mineralized steppe Lake Khilganta (Transbaikal Region, Russia). Cells of the strain, designated Х-07-2T, were straight to slightly curved rods, Gram-stain-positive and motile. Strain Х-07-2T grew in the pH range from 7.0 to 10.7 (optimum pH 9.6-10.3). Growth was observed at 25-47 °C (optimum 30 °C) and at an NaCl concentration from 5 to 150 g l-1 with an optimum at 40 g l-1. Strain Х-07-2T was a chemo-organoheterotroph able to reduce amorphous ferric hydroxide, Fe(III) citrate and elemental sulfur in the presence of yeast extract as the electron donor...
June 20, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28631290/a-h2-oxidizing-1-2-3-trichlorobenzene-reducing-multienzyme-complex-isolated-from-the-obligately-organohalide-respiring-bacterium-dehalococcoides-mccartyi-strain-cbdb1
#19
Stefanie Hartwig, Nadya Dragomirova, Anja Kublik, Dominique Türkowsky, Martin von Bergen, Ute Lechner, Lorenz Adrian, R Gary Sawers
Dehalococcoides mccartyi is a small, slow-growing bacterium of the phylum Chloroflexi that conserves energy using aliphatic and aromatic organohalides as electron acceptors, and hydrogen as sole electron donor. A recent study identified a protein complex in the membrane of strain CBDB1 comprising a Hup hydrogenase, a complex iron-sulphur molybdoprotein and a reductive dehalogenase (RdhA) that catalyses reduction of 1,2,3,4-tetrachlorobenzene. Using a combination of size-exclusion chromatography, in-gel hydrogenase activity-staining, immunological analysis and mass spectrometry, we identified here a large molecular mass protein complex solubilized from the cytoplasmic membrane of D...
June 19, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28631237/structural-characterization-of-pyoverdines-produced-by-pseudomonas-putida-kt2440-and-pseudomonas-taiwanensis-vlb120
#20
Matthias Baune, Yulin Qi, Karen Scholz, Dietrich A Volmer, Heiko Hayen
The previously unknown sequences of several pyoverdines (PVD) produced by a biotechnologically-relevant bacterium, namely, Pseudomonas taiwanensis VLB120, were characterized by high performance liquid chromatography (HPLC)-high resolution mass spectrometry (HRMS). The same structural characterization scheme was checked before by analysis of Pseudomonas sp. putida KT2440 samples with known PVDs. A new sample preparation strategy based on solid-phase extraction was developed, requiring significantly reduced sample material as compared to existing methods...
June 19, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
keyword
keyword
59820
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"