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https://www.readbyqxmd.com/read/28230984/2d-conductive-iron-quinoid-magnets-ordering-up-to-tc-105-k-via-heterogenous-redox-chemistry
#1
Jordan A DeGayner, Ie-Rang Jeon, Lei Sun, Mircea Dinca, T David Harris
We report the magnetism and conductivity for a redox isomeric pair of iron-quinoid metal-organic frameworks (MOFs). The oxidized isomer, (Me2NH2)2[Fe2L3]·2H2O·6DMF (LH2 = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinone) was previously shown to magnetically order below 80 K in its solvated form, with the ordering temperature decreasing to 26 K upon desolvation. Here, we demonstrate this compound to exhibit electrical conductivity values up to σ = 1.4(7) × 10(-2) S/cm (Ea = 0.26(1) cm(-1)) and 1.0(3) × 10(-3) S/cm (Ea = 0...
February 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28229255/nordic-walking-training-attenuation-of-oxidative-stress-in-association-with-a-drop-in-body-iron-stores-in-elderly-women
#2
Jakub Kortas, Agnieszka Kuchta, Krzysztof Prusik, Katarzyna Prusik, Ewa Ziemann, Sandra Labudda, Agnieszka Ćwiklińska, Ewa Wieczorek, Maciej Jankowski, Jedrzej Antosiewicz
Excess body iron accumulation and oxidative stress has been associated with ageing. Regular exercise has been shown to reduce oxidative stress and induce some changes in iron metabolism. However, the effects of exercise on both of these parameters have been poorly investigated. In our study, 35 elderly women participated in 12 weeks of Nordic walking (NW) training (three times a week). We demonstrated that the training caused a significant reduction in malondialdehyde advanced oxidation protein products-markers of oxidative stress but had no effects on paraoxonase 1 activity...
February 22, 2017: Biogerontology
https://www.readbyqxmd.com/read/28229219/prevalence-and-clinical-impact-of-iron-deficiency-and-anaemia-among-outpatients-with-chronic-heart-failure-the-prep-registry
#3
Stephan von Haehling, Uwe Gremmler, Michael Krumm, Frank Mibach, Norbert Schön, Jens Taggeselle, Johannes B Dahm, Christiane E Angermann
BACKGROUND: Iron deficiency (ID) and anaemia are common in heart failure (HF). The prospective, observational PReP registry (Prävalenz des Eisenmangels bei Patienten mit Herzinsuffizienz) studied prevalence and clinical impact of ID and anaemia in HF outpatients attending cardiology practices in Germany. METHODS AND RESULTS: A total of 42 practices enrolled consecutive patients with chronic HF [left ventricular ejection fraction (LVEF) ≤45%]. ID was defined as serum ferritin <100 µg/l, or serum ferritin ≥100 µg/l/<300 µg/l plus transferrin saturation <20%, and anaemia as haemoglobin <13 g/dl (12 g/dl) in men (women)...
February 22, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28228969/prevention-and-treatment-of-neonatal-nosocomial-infections
#4
REVIEW
Jayashree Ramasethu
Nosocomial or hospital acquired infections threaten the survival and neurodevelopmental outcomes of infants admitted to the neonatal intensive care unit, and increase cost of care. Premature infants are particularly vulnerable since they often undergo invasive procedures and are dependent on central catheters to deliver nutrition and on ventilators for respiratory support. Prevention of nosocomial infection is a critical patient safety imperative, and invariably requires a multidisciplinary approach. There are no short cuts...
2017: Maternal Health, Neonatology and Perinatology
https://www.readbyqxmd.com/read/28228829/hepatic-iron-storage-is-related-to-body-adiposity-and-hepatic-inflammation
#5
Chan Yoon Park, Jayong Chung, Kyung-Ok Koo, Min Soo Kim, Sung Nim Han
BACKGROUND: Obesity has been reported to be associated with iron deficiency. However, few studies have investigated iron status in low adiposity. To investigate whether body adiposity was associated with altered hepatic iron status, we compared liver iron levels and markers involved in inflammation and iron absorption in obese, control, and mildly calorie restricted mice. METHODS: Seven week old C57BL/6 mice were fed control (10% kcal fat, Control) or high fat (60% kcal fat, HFD) diets, or reduced amount of control diet to achieve 15% calorie restriction (CR) for 16 weeks...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28226251/effects-of-sulfate-on-heavy-metal-release-from-iron-corrosion-scales-in-drinking-water-distribution-system
#6
Huifang Sun, Baoyou Shi, Fan Yang, Dongsheng Wang
Trace heavy metals accumulated in iron corrosion scales within a drinking water distribution system (DWDS) could potentially be released to bulk water and consequently deteriorate the tap water quality. The objective of this study was to identify and evaluate the release of trace heavy metals in DWDS under changing source water conditions. Experimental pipe loops with different iron corrosion scales were set up to simulate the actual DWDS. The effects of sulfate levels on heavy metal release were systemically investigated...
February 13, 2017: Water Research
https://www.readbyqxmd.com/read/28225588/self-assembled-and-one-step-synthesis-of-interconnected-3d-network-of-fe3o4-reduced-graphene-oxide-nanosheets-hybrid-for-high-performance-supercapacitor-electrode
#7
Rajesh Kumar, Rajesh Kumar Singh, Alfredo R Vaz, Raluca Savu, Stanislav A Moshkalev
In the present work, we have synthesized three dimensional (3D) reduced graphene oxide nanosheets (rGO NSs) containing iron oxide nanoparticles (Fe3O4 NPs) hybrids (3D Fe3O4/rGO) by one-pot microwave approach. Structural and morphological studies reveal that the as-synthesized Fe3O4/rGO hybrids were composed of faceted Fe3O4 NPs induced into the interconnected network of rGO NSs. The morphologies and structures of the 3D hybrids have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectrometer (XPS)...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28223911/fetpps-reduces-secondary-damage-and-improves-neurobehavioral-functions-after-traumatic-brain-injury
#8
Giuseppe Bruschetta, Daniela Impellizzeri, Michela Campolo, Giovanna Casili, Rosanna Di Paola, Irene Paterniti, Emanuela Esposito, Salvatore Cuzzocrea
Traumatic brain injury (TBI) determinate a cascade of events that rapidly lead to neuron's damage and death. We already reported that administration of FeTPPS, a 5,10,15,20-tetrakis (4-sulfonatophenyl) porphyrin iron III chloride peroxynitrite decomposition catalyst, possessed evident neuroprotective effects in a experimental model of spinal cord damage. The present study evaluated the neuroprotective property of FeTPPS in TBI, using a clinically validated model of TBI, the controlled cortical impact injury (CCI)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28219939/peroxiredoxin-1-prx1-is-a-dual-function-enzyme-by-possessing-cys-independent-catalase-like-activity
#9
Cen-Cen Sun, Wei-Ren Dong, Tong Shao, Jiang-Yuan Li, Jing Zhao, Li Nie, Li-Xin Xiang, Guan Zhu, Jian-Zhong Shao
Peroxiredoxin (Prx) was previously known as a Cys-dependent thioredoxin. However, we unexpected observed that Prx1 from the green spotted puffer fish Tetraodon nigroviridis (TnPrx1) was able to reduce H2O2 in a manner independent on the Cys peroxidation and reductants. This study aimed to validate the novel function for Prx1, delineate the biochemical features and explore its antioxidant role in cells. We have confirmed that Prx1 from the puffer fish and humans truly possesses a catalase-like activity that is independent of Cys residues and reductants, but dependent on iron...
February 20, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28219768/copper-therapy-reduces-intravascular-hemolysis-and-derepresses-ferroportin-in-mice-with-mosaic-mutation-atp7a-mo-ms-an-implication-for-copper-mediated-regulation-of-the-slc40a1-gene-expression
#10
Małgorzata Lenartowicz, Rafał R Starzyński, Aneta Jończy, Robert Staroń, Justyna Antoniuk, Wojciech Krzeptowski, Paweł Grzmil, Aleksandra Bednarz, Olga Pierzchała, Mateusz Ogórek, Zenon Rajfur, Zbigniew Baster, Paweł Lipiński
Mosaic mutant mice displaying functional dysfunction of Atp7a copper transporter (the Menkes ATPase) are an established animal model of Menkes disease and constitute a convenient tool for investigating connections between copper and iron metabolisms. This model allows to explore changes in iron metabolism in suckling mutant mice suffering from systemic copper deficiency as well as in young and adult ones undergone copper therapy, which reduces lethal effect of the Atp7a gene mutation. Our recent study demonstrated that 14-day-old mosaic mutant males display blood cell abnormalities associated with intravascular hemolysis, and show disturbances in the functioning of the hepcidin-ferroportin regulatory axis, which controls systemic iron homeostasis...
February 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28219079/light-induced-structural-changes-and-the-site-of-o-o-bond-formation-in-psii-caught-by-xfel
#11
Michihiro Suga, Fusamichi Akita, Michihiro Sugahara, Minoru Kubo, Yoshiki Nakajima, Takanori Nakane, Keitaro Yamashita, Yasufumi Umena, Makoto Nakabayashi, Takahiro Yamane, Takamitsu Nakano, Mamoru Suzuki, Tetsuya Masuda, Shigeyuki Inoue, Tetsunari Kimura, Takashi Nomura, Shinichiro Yonekura, Long-Jiang Yu, Tomohiro Sakamoto, Taiki Motomura, Jing-Hua Chen, Yuki Kato, Takumi Noguchi, Kensuke Tono, Yasumasa Joti, Takashi Kameshima, Takaki Hatsui, Eriko Nango, Rie Tanaka, Hisashi Naitow, Yoshinori Matsuura, Ayumi Yamashita, Masaki Yamamoto, Osamu Nureki, Makina Yabashi, Tetsuya Ishikawa, So Iwata, Jian-Ren Shen
Photosystem II (PSII) is a huge membrane-protein complex consisting of 20 different subunits with a total molecular mass of 350 kDa for a monomer. It catalyses light-driven water oxidation at its catalytic centre, the oxygen-evolving complex (OEC). The structure of PSII has been analysed at 1.9 Å resolution by synchrotron radiation X-rays, which revealed that the OEC is a Mn4CaO5 cluster organized in an asymmetric, 'distorted-chair' form. This structure was further analysed with femtosecond X-ray free electron lasers (XFEL), providing the 'radiation damage-free' structure...
February 20, 2017: Nature
https://www.readbyqxmd.com/read/28218533/water-table-dynamics-and-biogeochemical-cycling-in-a-shallow-variably-saturated-floodplain
#12
Steven B Yabusaki, Michael J Wilkins, Yilin Fang, Kenneth H Williams, Bhavna Arora, John R Bargar, Harry R Beller, Nicholas J Bouskill, Eoin L Brodie, John N Christensen, Mark E Conrad, Robert E Danczak, Eric King, Nicolas F Spycher, Carl I Steefel, Tetsu K Tokunaga, Roelof Jan Versteeg, Scott R Waichler, Haruko M Wainwright
Three-dimensional variably saturated flow and multicomponent biogeochemical reactive transport modeling, based on published and newly generated data, is used to better understand the interplay of hydrology, geochemistry, and biology controlling the cycling of carbon, nitrogen, oxygen, iron, sulfur, and uranium in a shallow floodplain. In this system, aerobic respiration generally maintains anoxic groundwater below an oxic vadose zone until seasonal snowmelt-driven water table peaking transports dissolved oxygen (DO) and nitrate from the vadose zone into the alluvial aquifer...
February 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28217798/non-sensitized-selective-photochemical-reduction-of-co2-to-co-under-visible-light-with-an-iron-molecular-catalyst
#13
Heng Rao, Julien Bonin, Marc Robert
A substituted tetraphenyl iron porphyrin, bearing positively charged trimethylammonio groups at the para position of each phenyl ring, demonstrates its ability as a homogeneous molecular catalyst to selectively reduce CO2 to CO under visible light irradiation in organic media without the assistance of a sensitizer and no competitive hydrogen evolution for several days.
February 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28216963/micronutrient-deficiencies-in-patients-with-chronic-atrophic-autoimmune-gastritis-a-review
#14
EDITORIAL
Federica Cavalcoli, Alessandra Zilli, Dario Conte, Sara Massironi
Chronic atrophic autoimmune gastritis (CAAG) is an organ-specific autoimmune disease characterized by an immune response, which is directed towards the parietal cells and intrinsic factor of the gastric body and fundus and leads to hypochlorhydria, hypergastrinemia and inadequate production of the intrinsic factor. As a result, the stomach's secretion of essential substances, such as hydrochloric acid and intrinsic factor, is reduced, leading to digestive impairments. The most common is vitamin B12 deficiency, which results in a megaloblastic anemia and iron malabsorption, leading to iron deficiency anemia...
January 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28216591/iron-supply-affects-anthocyanin-content-and-related-gene-expression-in-berries-of-vitis-vinifera-cv-cabernet-sauvignon
#15
Pengbao Shi, Bing Li, Haiju Chen, Changzheng Song, Jiangfei Meng, Zhumei Xi, Zhenwen Zhang
Anthocyanins are important compounds for red grape and red wine quality, and can be influenced by supply of nutrients such as nitrogen, phosphorus, potassium, zinc, and iron. The present work aims to gain a better understanding of the effect of iron supply on anthocyanins concentration in grape berries. To this end, own-rooted four-year-old Cabernet Sauvignon grapevines (Vitis vinifera) were fertigated every three days with 0, 23, 46, 92, and 184 μM iron (Fe) from ferric ethylenediamine di (o-hydroxyphenylacetic) acid (Fe-EDDHA) in a complete nutrient solution...
February 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28215151/iron-chelators-dictate-immune-cells-inflammatory-ability-potential-adjuvant-therapy-for-ibd
#16
Marcello Chieppa, Vanessa Galleggiante, Grazia Serino, Monica Massaro, Angelo Santino
BACKGROUND: The importance of hemoproteins for life lies largely in their iron-mediated chemical properties. In the human body, there are about 4 g of iron, a precious resource preserved by sophisticated recycling mechanisms. Iron is also important for pathogen growth, so it is not surprising that immune cells developed mechanisms to reduce iron availability in cases of inflammation. In healthy conditions, macrophages degrade hemoproteins and export iron, while if inflammation develops, they retain cytoplasmic iron to reduce extracellular iron concentrations...
February 15, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28215084/effect-of-l-cysteine-and-transition-metal-ions-on-dimethyl-sulfide-oxidation
#17
Matthias Baldus, Rüdiger Klie, Xi De, Frank-Juergen Methner
During malt kilning, significant amounts of dimethyl sulfide (DMS) oxidize leading to the formation of dimethyl sulfoxide (DMSO), a precursor of DMS during fermentation. Yet, knowledge regarding reaction mechanisms of DMSO formation during malt production is limited. The role of thiols in sulfide oxidation is unclear as they possess sulfoxide reducing ability as well as pro- and antioxidative properties. This study investigated the effects of the thiol L-cysteine (Cys), molecular oxygen, transition metal ions and EDTA on DMS oxidation in aqueous model solutions...
February 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28214969/attached-and-suspended-denitrifier-communities-in-pristine-limestone-aquifers-harbor-high-fractions-of-potential-autotrophs-oxidizing-reduced-iron-and-sulfur-compounds
#18
M Herrmann, S Opitz, R Harzer, K U Totsche, K Küsel
Oxygen and nitrate availability as well as the presence of suitable organic or inorganic electron donors are strong drivers of denitrification; however, the factors influencing denitrifier abundance and community composition in pristine aquifers are not well understood. We explored the denitrifier community structure of suspended and attached groundwater microorganisms in two superimposed limestone aquifer assemblages with contrasting oxygen regime in the Hainich Critical Zone Exploratory (Germany). Attached communities were retrieved from freshly crushed parent rock material which had been exposed for colonization in two groundwater wells (12...
February 18, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28214907/a-pilot-study-of-bacterial-regrowth-in-water-pipelines
#19
Laura Mancini, Stefania Marcheggiani, Cinzia Grasso, Cristina Romanelli, Antonio Mistretta, Marina Marranzano
Bacterial regrowth in water distribution systems results in deterioration of bacteriological quality of drinking water, as well as accelerated corrosion of the pipelines. The aim of the present study was to analyze the phenomena of colonization and bacterial regrowth in source water and in the water distribution systems of three distribution networks in the province of Catania (Sicily, Italy). The BART™ (Biological Activity Reaction Test) method was used, which is also capable of determining the potential aggressiveness of microbial species in water...
November 2016: Igiene e Sanità Pubblica
https://www.readbyqxmd.com/read/28213526/structural-and-mechanistic-insights-into-hemoglobin-catalyzed-hydrogen-sulfide-oxidation-and-the-fate-of-polysulfide-products
#20
Victor Vitvitsky, Pramod K Yadav, Sojin An, Javier Seravalli, Uhn-Soo Cho, Ruma Banerjee
Hydrogen sulfide is a cardioprotective signaling molecule but is toxic at elevated concentrations. Red blood cells can synthesize H2S but lacking organelles, cannot dispose off H2S via the mitochondrial sulfide oxidation pathway. We have recently shown that at high sulfide concentrations, ferric hemoglobin oxidizes H2S to a mixture of thiosulfate and iron-bound polysulfides in which the latter species predominates. Here, we report the crystal structure of human hemoglobin containing low-spin ferric sulfide, the first intermediate in heme-catalyzed sulfide oxidation...
February 17, 2017: Journal of Biological Chemistry
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