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https://www.readbyqxmd.com/read/28636395/synthesis-of-the-marine-myxobacterial-antibiotic-enhygrolide-a
#1
Ramesh Muddala, Jaime A M Acosta, Luiz C A Barbosa, John Boukouvalas
The first synthesis of enhygrolide A, a scarce γ-alkylidenebutenolide antibiotic of the obligate marine myxobacterium Enhygromyxa salina, was achieved in five steps and 54% overall yield from tetronic acid. Key steps include (i) organocatalytic reductive alkylation, (ii) iron-catalyzed sp(2)-sp(3) cross-coupling, and (iii) vinylogous aldol condensation. Aside from its brevity and reliance on environmentally sustainable processes, the synthesis demonstrates the serviceability of butenolide pivalates in cross-coupling reactions...
June 21, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28636310/sensing-mechanisms-in-the-redox-regulated-2fe-2s-cluster-containing-bacterial-transcriptional-factor-soxr
#2
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/28635269/the-reduction-potentials-of-fefe-hydrogenase-accessory-iron-sulfur-clusters-provide-insights-into-the-energetics-of-proton-reduction-catalysis
#3
Jacob H Artz, David W Mulder, Michael W Ratzloff, Carolyn E Lubner, Oleg A Zadvornyy, Axl X LeVan, S Garrett Williams, Michael W W Adams, Anne K Jones, Paul W King, John W Peters
An [FeFe]-hydrogenase from Clostridium pasteurianum, CpI, is a model system for biological H2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [FeS] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28631472/phosphate-shifted-oxygen-reduction-pathway-on-fe-fe2o3-core-shell-nanowires-for-enhanced-reactive-oxygen-species-generation-and-aerobic-4-chlorophenol-degradation
#4
Yi Mu, Zhihui Ai, Lizhi Zhang
Phosphate ions widely exist in the environment. Previous studies revealed that the adsorption of phosphate ions on nanoscale zero-valent iron would generate a passivating oxide shell to block reactive sites and thus decrease the direct pollutant reduction reactivity of zero-valent iron. Given that molecular oxygen activation process is different from direct pollutant reduction with nanoscale zero-valent iron, it is still unclear how phosphate ions will affect molecular oxygen activation and reactive oxygen species generation with nanoscale zero-valent iron...
June 20, 2017: Environmental Science & Technology
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
#5
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/28628876/column-study-of-enhanced-cr-vi-removal-and-longevity-by-coupled-abiotic-and-biotic-processes-using-fe-0-and-mixed-anaerobic-culture
#6
Jiawei Zhong, Weizhao Yin, Yongtao Li, Ping Li, Jinhua Wu, Gangbiao Jiang, Jingjing Gu, Hao Liang
In this study, Fe(0) and mixed anaerobic culture were integrated in one column to investigate the coupled abiotic and biotic effects on hexa-valent chromium (Cr(VI)) removal and column longevity with an abiotic Fe(0) column in the control experiments. According to the breakthrough study, a slower Cr(VI) breakthrough rate of 0.19 cm/PV was observed in the biotic Fe(0) column whereas the value in the abiotic Fe(0) column was 0.30 cm/PV, resulting in 64% longer life-span and 62% higher Cr(VI) removal capacity in the biotic Fe(0) column than the abiotic one...
June 2, 2017: Water Research
https://www.readbyqxmd.com/read/28624617/core-shell-iron-oxide-layered-double-hydroxide-high-electrochemical-sensing-performance-of-h2o2-biomarker-in-live-cancer-cells-with-plasma-therapeutics
#7
Muhammad Asif, Hongwei Liu, Ayesha Aziz, Haitao Wang, Zhengyun Wang, Muhammad Ajmal, Fei Xiao, Hongfang Liu
In this work, we develop a new type of multifunctional core-shell nanomaterial by controllable integration of CuAl layered double hydroxides (LDHs) over the surface of iron oxides (Fe3O4) nanospheres (NSs) to fabricate (Fe3O4@CuAl NSs) hybrid material with interior tunability of LDH phase and explore its practical application in ultrasensitive detection of emerging biomarker, i.e., H2O2 as cancer diagnostic probe. In addition, atmospheric pressure plasmas (APPs) have also been used as potential therapeutic approach for cancer treatment...
June 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28618195/novel-reductive-dehalogenases-from-the-marine-sponge-associated-bacterium-desulfoluna-spongiiphila
#8
Jie Liu, Nora Lopez, Young-Beom Ahn, Tatyana Goldberg, Yana Bromberg, Lee J Kerkhof, Max M Häggblom
Desulfoluna spongiiphila strain AA1 is an organohalide respiring bacterium, isolated from the marine sponge Aplysina aerophoba, that can use brominated and iodinated phenols, in addition to sulfate and thiosulfate as terminal electron acceptors. The genome of Desulfoluna spongiiphila strain AA1 is approximately 6.5 Mb. Three putative reductive dehalogenase (rdhA) genes involved in respiratory metabolism of organohalides were identified within the sequence. Conserved motifs found in respiratory reductive dehalogenases (a twin arginine translocation signal sequence and two iron-sulfur clusters) were present in all three putative AA1 rdhA genes...
June 15, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28615262/predictors-of-anemia-in-women-of-reproductive-age-biomarkers-reflecting-inflammation-and-nutritional-determinants-of-anemia-brinda-project
#9
REVIEW
James P Wirth, Bradley A Woodruff, Reina Engle-Stone, Sorrel Ml Namaste, Victor J Temple, Nicolai Petry, Barbara Macdonald, Parminder S Suchdev, Fabian Rohner, Grant J Aaron
Background: Anemia in women of reproductive age (WRA) (age range: 15-49 y) remains a public health problem globally, and reducing anemia in women by 50% by 2025 is a goal of the World Health Assembly.Objective: We assessed the associations between anemia and multiple proximal risk factors (e.g., iron and vitamin A deficiencies, inflammation, malaria, and body mass index) and distal risk factors (e.g., education status, household sanitation and hygiene, and urban or rural residence) in nonpregnant WRA.Design: Cross-sectional, nationally representative data from 10 surveys (n = 27,018) from the Biomarkers Reflecting Inflammation and Nutritional Determinants of Anemia (BRINDA) project were analyzed individually and pooled by the infection burden and risk in the country...
June 14, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28615256/adjusting-soluble-transferrin-receptor-concentrations-for-inflammation-biomarkers-reflecting-inflammation-and-nutritional-determinants-of-anemia-brinda-project
#10
REVIEW
Fabian Rohner, Sorrel Ml Namaste, Leila M Larson, O Yaw Addo, Zuguo Mei, Parminder S Suchdev, Anne M Williams, Fayrouz A Sakr Ashour, Rahul Rawat, Daniel J Raiten, Christine A Northrop-Clewes
Background: Iron deficiency is thought to be one of the most prevalent micronutrient deficiencies globally, but an accurate assessment in populations who are frequently exposed to infections is impeded by the inflammatory response, which causes iron-biomarker alterations.Objectives: We assessed the relation between soluble transferrin receptor (sTfR) concentrations and inflammation and malaria in preschool children (PSC) (age range: 6-59 mo) and women of reproductive age (WRA) (age range: 15-49 y) and investigated adjustment algorithms to account for these effects...
June 14, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28614589/lactoferrin-protects-against-intestinal-inflammation-and-bacteria-induced-barrier-dysfunction-in-vitro
#11
Nina A Hering, Julia Luettig, Susanne M Krug, Stephanie Wiegand, Gabriele Gross, Eric A van Tol, Jörg D Schulzke, Rita Rosenthal
The iron-binding glycoprotein lactoferrin (LF) is naturally present in human breast milk. Several studies suggest that LF contributes to infant health and development owing to a variety of protective effects, including antimicrobial and anti-inflammatory features. Therefore, we aimed to elucidate its protective properties on intestinal epithelial barrier dysfunction induced by infection or inflammation using the human epithelial cell culture models HT-29/B6 and T84. During barrier perturbation induced by the proinflammatory cytokine tumor necrosis factor α (TNF-α), bovine LF restored tight junction (TJ) morphometry and inhibited TNF-α-induced epithelial apoptosis...
June 14, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28612172/chromium-iii-and-iron-iii-inhibits-replication-of-dna-and-rna-viruses
#12
Sylwia Terpiłowska, Andrzej Krzysztof Siwicki
The aim of this study was to examine the effect of treating of chromium(III) and iron(III) and their combinations on Herpes Simplex Virus type 1 (HSV-1) and Bovine Viral Diarrhoea virus (BVDV) replication. The antiviral efficacies of chromium(III) and iron(III) on HSV-1 and BVDV were evaluated using Real Time PCR method. Moreover, the cytotoxicity of these microelements was examined using the MTT reduction assay. The IC50 (50% inhibiotory concentration) for the chromium chloride was 1100 μM for Hep-2 cells and 1400 μM for BT cells...
June 13, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28609747/the-enhancement-roles-of-layered-double-hydroxide-on-the-reductive-immobilization-of-selenate-by-nanoscale-zero-valent-iron-macroscopic-and-microscopic-approaches
#13
Baowei Hu, Feng Ye, Chengan Jin, Xiangxian Ma, Chengcai Huang, Guodong Sheng, Jingyuan Ma, Xiangke Wang, Yuying Huang
Herein, we utilized nanoscale zero-valent iron loaded on layered double hydroxide (NZVI/LDH) to immobilize Se(VI) and evaluated the enhancement role of LDH in the NZVI reaction system. The structural characterization indicated that LDH could stabilize and disperse NZVI as well as prevent NZVI from oxidation, thereby increasing iron reactivity. Batch experiments displayed that, compared with those by NZVI, both extent and rate of Se(VI) immobilized by NZVI/LDH significantly increased, owing to the prominent synergistic effect ascribing from adsorption and reduction...
June 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28609093/disilicate-assisted-iron-electrolysis-for-sequential-fenton-oxidation-and-coagulation-of-aqueous-contaminants
#14
Jiaxin Cui, Xu Wang, Jing Zhang, Xiaoyu Qiu, Dihua Wang, Ying Zhao, Beidou Xi, Akram Alshawabkeh, Xuhui Mao
Sodium disilicate (SD), an inorganic and environmentally friendly ligand, is introduced into the conventional iron electrolysis system to achieve an oxidizing Fenton process to degrade organic pollutants. Electrolytic ferrous ions, which are complexed by the disilicate ions, can chemically reduce dioxygen molecules via consecutive reduction steps, producing H2O2 for the Fenton-oxidation of organics. At the near-neutral pH (from 6 to 8), the disilicate-Fe(II) complexes possess strong reducing capabilities; therefore, a near-neutral pH rather than an acid condition is preferable for the disilicate-assisted iron electrolysis (DAIE) process...
June 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28608682/powering-a-co2-reduction-catalyst-with-visible-light-through-multiple-sub-picosecond-electron-transfers-from-a-quantum-dot
#15
Shichen Lian, Mohamad S Kodaimati, Dmitriy S Dolzhnikov, Raul Calzada, Emily A Weiss
Photosensitization of molecular catalysts to reduce CO2 to CO is a sustainable route to storable solar fuels. Crucial to the sensitization process is highly efficient transfer of redox equivalents from sensitizer to catalyst; in systems with molecular sensitizers, this transfer is often slow because it is gated by diffusion-limited collisions between sensitizer and catalyst. This article describes the photosensitization of a meso-tetraphenylporphyrin iron(III) chloride (FeTPP) catalyst by colloidal, heavy metal-free CuInS2/ZnS quantum dots (QDs) to reduce CO2 to CO using 450-nm light...
June 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28605580/structures-interconversions-and-spectroscopy-of-iron-carbonyl-clusters-with-an-interstitial-carbide-localized-metal-center-reduction-by-overall-cluster-oxidation
#16
Subramaniam Kuppuswamy, Joshua D Wofford, Chris Joseph, Zhu-Lin Xie, Azim K Ali, Vincent M Lynch, Paul A Lindahl, Michael J Rose
No abstract text is available yet for this article.
June 12, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28604755/physical-exercise-intervention-at-school-improved-hepcidin-inflammation-and-iron-metabolism-in-overweight-and-obese-children-and-adolescents
#17
Susana Coimbra, Cristina Catarino, Henrique Nascimento, Ana Inês Alves, Ana Filipa Medeiros, Elsa Bronze-da-Rocha, Elísio Costa, Petronila Rocha-Pereira, Luísa Aires, André Seabra, Jorge Mota, Helena Ferreira Mansilha, Carla Rêgo, Alice Santos-Silva, Luís Belo
BACKGROUND: Obesity is often associated with iron deficiency in children and adolescents. We aimed to study the effect of 8-month physical exercise (PE) intervention in hepcidin and other markers of inflammation and in iron status in overweight/obese children and adolescents. METHODS: Seventy-three overweight/obese children and adolescents participated in the 8-month longitudinal study; they were divided in two groups according to their participation in an after-school PE program: PE (n=44) and control (n=29) groups...
June 12, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28603601/reactivity-of-hydride-bridges-in-a-high-spin-fe3-%C3%AE-h-3-3-cluster-reversible-h2-co-exchange-and-fe-h-b-f-bond-metathesis
#18
Kevin J Anderton, Brian J Knight, Arnold L Rheingold, Khalil A Abboud, Ricardo García-Serres, Leslie J Murray
The triiron trihydride complex Fe3H3L (1) [where L(3-) is a tris(β-diketiminate)cyclophanate] reacts with CO and with BF3·OEt2 to afford (Fe(I)CO)2Fe(II)(μ3-H)L (2) and Fe3F3L (3), respectively. Variable-temperature and applied-field Mössbauer spectroscopy support the assignment of two high-spin (HS) iron(i) centers and one HS iron(ii) ion in 2. Preliminary studies support a CO-induced reductive elimination of H2 from 1, rather than CO trapping a species from an equilibrium mixture. This complex reacts with H2 to regenerate 1 under a dihydrogen atmosphere, which represents a rare example of reversible CO/H2 exchange and the first to occur at high-spin metal centers, as well as the first example of a reversible multielectron redox reaction at a designed high-spin metal cluster...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28603028/targeting-of-p32-in-peritoneal-carcinomatosis-with-intraperitoneal-lintt1-peptide-guided-pro-apoptotic-nanoparticles
#19
Hedi Hunt, Lorena Simón-Gracia, Allan Tobi, Venkata Ramana Kotamraju, Shweta Sharma, Mait Nigul, Kazuki N Sugahara, Erkki Ruoslahti, Tambet Teesalu
Gastrointestinal and gynecological malignancies disseminate in the peritoneal cavity - a condition known as peritoneal carcinomatosis (PC). Intraperitoneal (IP) administration can be used to improve therapeutic index of anticancer drugs used for PC treatment. Activity of IP anticancer drugs can be further potentiated by encapsulation in nanocarriers and/or affinity targeting with tumor-specific affinity ligands, such as tumor homing peptides. Here we evaluated a novel tumor penetrating peptide, linTT1 (AKRGARSTA), as a PC targeting ligand for nanoparticles...
June 8, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28602002/enhanced-removal-of-ethanolamine-from-secondary-system-of-nuclear-power-plant-wastewater-by-novel-hybrid-nano-zero-valent-iron-and-pressurized-ozone-initiated-oxidation-process
#20
Son Dong Lee, Srinivasa Reddy Mallampati, Byoung Ho Lee
Monoethanolamine (shortly ethanolamine (ETA)), usually used as a corrosion inhibitor, is a contaminant of wastewater from the secondary cooling system of nuclear power plants (NPPs) and is not readily biodegradable. We conducted various experiments, including treatments with nano zero-valent iron (nZVI), nano-iron/calcium, and calcium oxide (nFe/Ca/CaO) with ozone (O3) or hydrogen peroxide (H2O2) to reduce the concentration of ETA and to decrease the chemical demand of oxygen (COD) of these wastewaters. During this study, wastewater with ETA concentration of 7465 mg L(-1) and COD of 6920 mg L(-1) was used...
June 11, 2017: Environmental Science and Pollution Research International
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