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https://www.readbyqxmd.com/read/28530398/synthesis-properties-and-semiconducting-characteristics-of-bf2-complexes-of-%C3%AE-%C3%AE-bisphenanthrene-fused-azadipyrromethenes
#1
Wanle Sheng, Yu-Qing Zheng, Qinghua Wu, Yayang Wu, Changjiang Yu, Lijuan Jiao, Erhong Hao, Jie-Yu Wang, Jian Pei
Three novel π-extended BF2 complexes of β,β-bisphenanthrene-fused azadipyrromethenes containing nine fused rings have been synthesized on the basis of a tandem Suzuki coupling reaction on readily available 2,6-dibromoazaBODIPYs followed by an intramolecular oxidative aromatic coupling mediated by iron(III) chloride. These resultant BF2 complexes exhibit strong absorption (extinction coefficients up to 2.4 × 10(5) M(-1) cm(-1)) and emission in the near-infrared (NIR) range (790-816 nm) with excellent photo and thermal stabilities...
May 22, 2017: Organic Letters
https://www.readbyqxmd.com/read/28530105/effect-of-humic-acid-on-the-removal-of-chromium-vi-and-the-production-of-solids-in-iron-electrocoagulation
#2
Chao Pan, Lyndsay D Troyer, Peng Liao, Jeffrey G Catalano, Wenlu Li, Daniel E Giammar
Iron-based electrocoagulation can be highly effective for Cr(VI) removal from water supplies. However, the presence of humic acid (HA) inhibited the rate of Cr(VI) removal in electrocoagulation, with the greatest decreases in Cr(VI) removal rate at higher pH. This inhibition was probably due to the formation of Fe(II) complexes with HA that are more rapidly oxidized than uncomplexed Fe(II) by dissolved oxygen, making less Fe(II) available for reduction of Cr(VI). Close association of Fe(III), Cr(III), and HA in the solid products formed during electrocoagulation influenced the fate of both Cr(III) and HA...
May 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28529891/biomonitorization-of-iron-accumulation-in-the-substantia-nigra-from-lewy-body-disease-patients
#3
Belén Fernández, Isidro Ferrer, Fernando Gil, Sabine Hilfiker
Iron levels in the healthy human brain are known to be high in certain areas such as the substantia nigra (SN), and increase further with age. In addition, there is some evidence for a further increase in iron load in the SN of Parkinson's disease (PD) patients as compared to controls, which correlates with motor disability. Here, we have analyzed total iron levels in cells as well as mouse and human brain samples by atomic absorption spectroscopy (AAS). Our data indicate that iron load is more pronounced in cells with dopaminergic features...
2017: Toxicology Reports
https://www.readbyqxmd.com/read/28529645/tumor-penetrating-theranostic-nanoparticles-for-enhancement-of-targeted-and-image-guided-drug-delivery-into-peritoneal-tumors-following-intraperitoneal-delivery
#4
Ning Gao, Erica N Bozeman, Weiping Qian, Liya Wang, Hongyu Chen, Malgorzata Lipowska, Charles A Staley, Y Andrew Wang, Hui Mao, Lily Yang
The major obstacles in intraperitoneal (i.p.) chemotherapy of peritoneal tumors are fast absorption of drugs into the blood circulation, local and systemic toxicities, inadequate drug penetration into large tumors, and drug resistance. Targeted theranostic nanoparticles offer an opportunity to enhance the efficacy of i.p. therapy by increasing intratumoral drug delivery to overcome resistance, mediating image-guided drug delivery, and reducing systemic toxicity. Herein we report that i.p. delivery of urokinase plasminogen activator receptor (uPAR) targeted magnetic iron oxide nanoparticles (IONPs) led to intratumoral accumulation of 17% of total injected nanoparticles in an orthotopic mouse pancreatic cancer model, which was three-fold higher compared with intravenous delivery...
2017: Theranostics
https://www.readbyqxmd.com/read/28528002/iron-microencapsulation-in-gum-tragacanth-using-solvent-evaporation-method
#5
Elham Asghari-Varzaneh, Mohammad Shahedi, Hajar Shekarchizadeh
In this study iron salt (FeSO4·7H2O) was microencapsulated in gum tragacanth hydrogel using solvent evaporation method. Three significant parameters (ferrous sulfate content, content of gum tragacanth, and alcohol to mixture ratio) were optimized by response surface methodology to obtain maximum encapsulation efficiency. Ferrous sulfate content, 5%, content of gum tragacanth, 22%, and alcohol to mixture ratio, 11:1 was determined to be the optimum condition to reach maximum encapsulation efficiency. Microstructure of iron microcapsules was thoroughly monitored using scanning electron microscopy (SEM)...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28524209/understanding-the-biomimetic-properties-of-gallium-in-pseudomonas-aeruginosa-an-xas-and-xps-study
#6
F Porcaro, C Bonchi, A Ugolini, E Frangipani, G Polzonetti, P Visca, C Meneghini, C Battocchio
Pyochelin (PCH) is a siderophore (extracellular chelator) produced by the pathogenic bacterium Pseudomonas aeruginosa (PAO). PCH is implicated in iron (Fe(3+)) transport to PAO, and is crucial for its metabolism and pathogenicity. Due to the chemical similarity with Fe(3+), gallium (Ga(3+)) interferes with vital iron-dependent processes in bacterial cells, thereby opening new perspectives for the design of specific metal-based antibacterial drugs. However, the structural basis for the Fe(3+)-mimetic properties of Ga(3+) complexed with the PCH siderophore is still lacking...
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28521822/central-nervous-system-manganese-induced-lesions-and-clinical-consequences-in-patients-with-hereditary-hemorrhagic-telangiectasia
#7
M M Serra, C H Besada, A Cabana Cal, A Saenz, C V Stefani, D Bauso, A B Golimstok, J C Bandi, D H Giunta, C M Elizondo
BACKGROUND: Around 47-74% of patients with hereditary hemorrhagic telangiectasia (HHT) have hepatic vascular malformations (HVMs); magnetic resonance images (MRI) of the central nervous system (CNS) might show in T1 sequences a hyper-intensity signal in different areas, mainly in the basal ganglia (BG) as consequence of manganese (Mn) deposits as observed in cirrhotic patients. These patients might suffer from different neuropsychiatric disorders (hepatic encephalopathy). In HHT patients, even in the presence of hepatic shunts, hepatocellular function is usually preserved...
May 18, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28511672/crmapk3-regulates-the-expression-of-iron-deficiency-responsive-genes-in-chlamydomonas-reinhardtii
#8
Xiaowen Fei, Junmei Yu, Yajun Li, Xiaodong Deng
BACKGROUND: Under iron-deficient conditions, Chlamydomonas exhibits high affinity for iron absorption. Nevertheless, the response, transmission, and regulation of downstream gene expression in algae cells have not to be investigated. Considering that the MAPK pathway is essential for abiotic stress responses, we determined whether this pathway is involved in iron deficiency signal transduction in Chlamydomonas. RESULTS: Arabidopsis MAPK gene sequences were used as entry data to search for homologous genes in Chlamydomonas reinhardtii genome database to investigate the functions of mitogen-activated protein kinase (MAPK) gene family in C...
May 16, 2017: BMC Biochemistry
https://www.readbyqxmd.com/read/28511389/variability-of-iron-load-in-patients-of-sickle-cell-anaemia-hbss-a-study-from-eastern-india
#9
Pranati Mohanty, Rabindra Kumar Jena, Sudha Sethy
INTRODUCTION: Sickle Cell Anaemia (SCA) is one of the commonest haemoglobinopathies due to a point mutation (A→T) of the β-globin gene. Out of five haplotypes, the Arab-Indian haplotype present in India is one of the least severe phenotype and least studied also. It is characterized by lifelong haemolytic anaemia requiring red cell transfusion leading to iron overload. In contrast, there is very high incidence of deficiency of iron, folic acid and vitamin B12. AIM: Our objective was to access the Iron status of SCA patients and to find its correlation with various parameters like red cell transfusion, haemolysis and serum hepcidin...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28507005/perspective-what-makes-it-so-difficult-to-mitigate-worldwide-anemia-prevalence
#10
Klaus Schümann, Noel W Solomons
Anemia can be related to decreased production or increased loss of erythrocytes, or both, leading to many underlying and often overlapping causes. A largely cereal-based diet with plenty of phytates, polyphenols, and other ligands that inhibit intestinal iron absorption predominated in preindustrial Europe and predominates in present-day developing countries alike. In both situations, we find poor hygienic conditions, which frequently lead to anemia of inflammation. The large number of possible causes and their interaction shows why it is so difficult to mitigate anemia prevalence...
May 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28503169/cytotoxicity-intestinal-transport-and-bioavailability-of-dispersible-iron-and-zinc-supplements
#11
Hyeon-Jin Kim, Song-Hwa Bae, Hyoung-Jun Kim, Kyoung-Min Kim, Jae Ho Song, Mi-Ran Go, Jin Yu, Jae-Min Oh, Soo-Jin Choi
Iron or zinc deficiency is one of the most important nutritional disorders which causes health problem. However, food fortification with minerals often induces unacceptable organoleptic changes during preparation process and storage, has low bioavailability and solubility, and is expensive. Nanotechnology surface modification to obtain novel characteristics can be a useful tool to overcome these problems. In this study, the efficacy and potential toxicity of dispersible Fe or Zn supplement coated in dextrin and glycerides (SunActive Fe(TM) and SunActive Zn(TM)) were evaluated in terms of cytotoxicity, intestinal transport, and bioavailability, as compared with each counterpart without coating, ferric pyrophosphate (FePP) and zinc oxide (ZnO) nanoparticles (NPs), respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28501743/antarctic-fish-versus-human-cytoglobins-the-same-but-yet-so-different
#12
Bert Cuypers, Stijn Vermeylen, Dietmar Hammerschmid, Stanislav Trashin, Vanoushe Rahemi, Albert Konijnenberg, Amy De Schutter, C-H Christina Cheng, Daniela Giordano, Cinzia Verde, Karolien De Wael, Frank Sobott, Sylvia Dewilde, Sabine Van Doorslaer
The cytoglobins of the Antarctic fish Chaenocephalus aceratus and Dissostichus mawsoni have many features in common with human cytoglobin. These cytoglobins are heme proteins in which the ferric and ferrous forms have a characteristic hexacoordination of the heme iron, i.e. axial ligation of two endogenous histidine residues, as confirmed by electron paramagnetic resonance, resonance Raman and optical absorption spectroscopy. The combined spectroscopic analysis revealed only small variations in the heme-pocket structure, in line with the small variations observed for the redox potential...
April 28, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28500577/pectin-esterification-degree-in-the-bioavailability-of-non-heme-iron-in-women
#13
Angela Jaramillo, Paulina Molina, Lautaro Briones, Sebastián Flores, Manuel Olivares, Fernando Pizarro
Pectins are a type of soluble fiber present in natural and processed foods. Evidence regarding the effect of esterification degree of pectins on iron absorption in humans is scarce. In the present study, the effect of pectins with different degrees of esterification on non-heme iron absorption in women was evaluated. A controlled experimental study was conducted with block design, involving 13 apparently healthy, adult women. Each subject received 5 mg Fe (FeSO4) without pectin (control) or accompanied by 5 g citrus pectin, two with a low degree of esterification (27 and 36%), and one with a high degree of esterification (67 to 73%), each on different days...
May 12, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28500318/direct-observation-of-sink-dependent-defect-evolution-in-nanocrystalline-iron-under-irradiation
#14
O El-Atwani, J E Nathaniel, A C Leff, K Hattar, M L Taheri
Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with grain size refinement due to the increase in grain boundary surface area. The lower defect density should arise from grain boundary-point defect absorption and enhancement of interstitial-vacancy annihilation. In this study, low energy helium ion irradiation on free-standing iron thin films were performed at 573 K...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28495746/restored-iron-transport-by-a-small-molecule-promotes-absorption-and-hemoglobinization-in-animals
#15
Anthony S Grillo, Anna M SantaMaria, Martin D Kafina, Alexander G Cioffi, Nicholas C Huston, Murui Han, Young Ah Seo, Yvette Y Yien, Christopher Nardone, Archita V Menon, James Fan, Dillon C Svoboda, Jacob B Anderson, John D Hong, Bruno G Nicolau, Kiran Subedi, Andrew A Gewirth, Marianne Wessling-Resnick, Jonghan Kim, Barry H Paw, Martin D Burke
Multiple human diseases ensue from a hereditary or acquired deficiency of iron-transporting protein function that diminishes transmembrane iron flux in distinct sites and directions. Because other iron-transport proteins remain active, labile iron gradients build up across the corresponding protein-deficient membranes. Here we report that a small-molecule natural product, hinokitiol, can harness such gradients to restore iron transport into, within, and/or out of cells. The same compound promotes gut iron absorption in DMT1-deficient rats and ferroportin-deficient mice, as well as hemoglobinization in DMT1- and mitoferrin-deficient zebrafish...
May 12, 2017: Science
https://www.readbyqxmd.com/read/28495571/role-of-iron-in-the-pathogenesis-of-respiratory-disease
#16
REVIEW
Md Khadem Ali, Richard Y Kim, Rafia Karim, Jemma R Mayall, Kristy L Martin, Ali Shahandeh, Firouz Abbasian, Malcolm R Starkey, Veronique Loustaud-Ratti, Daniel Johnstone, Elizabeth A Milward, Philip M Hansbro, Jay C Horvat
Iron is essential for many biological processes, however, too much or too little iron can result in a wide variety of pathological consequences, depending on the organ system, tissue or cell type affected. In order to reduce pathogenesis, iron levels are tightly controlled in throughout the body by regulatory systems that control iron absorption, systemic transport and cellular uptake and storage. Altered iron levels and/or dysregulated homeostasis have been associated with several lung diseases, including chronic obstructive pulmonary disease, lung cancer, cystic fibrosis, idiopathic pulmonary fibrosis and asthma...
May 7, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28494509/estimates-of-total-body-iron-indicate-19-mg-and-38-mg-oral-iron-are-equivalent-for-the-mitigation-of-iron-deficiency-in-individuals-experiencing-repeated-phlebotomy
#17
Walter Bialkowski, Joseph E Kiss, David J Wright, Ritchard Cable, Rebecca Birch, Pam D'Andrea, Barbara J Bryant, Bryan R Spencer, Alan E Mast
Iron deficiency anemia is a common clinical condition often treated with tablets containing 65 mg of elemental iron. Such doses can elicit gastrointestinal side effects lowering patient compliance. Oral iron supplements also increase hepcidin production causing decreased fractional absorption of subsequent doses. Frequent blood donors often become iron deficient. Therefore, they were enrolled in a two-year study involving continued blood donations and randomization to receive no pill, placebo, 19, or 38 mg ferrous gluconate for 60 days...
May 11, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/28494396/a-comparative-study-of-the-spectral-fluorometric-properties-and-photostability-of-natural-curcumin-iron-and-boron-complexed-curcumin
#18
Fatima Mohammed, Fiza Rashid-Doubell, Seamas Cassidy, Fryad Henari
Curcumin is a yellow phenolic compound with a wide range of reported biological effects. However, two main obstacles hinder the use of curcumin therapeutically, namely its poor bioavailability and photostability. We have synthesized two curcumin complexes, the first a boron curcumin complex (B-Cur2) and the second an iron (Fe-Cur3) complex of curcumin. Both derivatives showed high fluorescence efficiency (quantum yield) and greater photostability in solution. The improved photostability could be attributed to the coordination structures and the removal of β-diketone group from curcumin...
April 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28494293/fate-of-arsenic-before-and-after-chemical-enhanced-washing-of-an-arsenic-containing-soil-in-hong-kong
#19
Jingzi Beiyuan, Jiang-Shan Li, Daniel C W Tsang, Lei Wang, Chi Sun Poon, Xiang-Dong Li, Scott Fendorf
This study evaluated the feasibility of 2-h chemical-enhanced washing of As-containing soil resulting from geogenic sources in Hong Kong and the fate of As before and after remediation. The soil morphology and As speciation in soil was elucidated by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. Integrated analysis of the results suggests that the As (>90%) resides predominantly as arsenate bound to ferric iron oxides, with a minor contribution (<10%) from an As(III)-sulphide phase...
May 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28493182/modeling-seasonal-and-spatial-contamination-of-surface-waters-and-upper-sediments-with-trace-metal-elements-across-industrialized-urban-areas-of-the-seybouse-watershed-in-north-africa
#20
Bourhane-Eddine Belabed, Abderrafik Meddour, Boudjéma Samraoui, Haroun Chenchouni
Industrialization and urbanization are the main sources of pollutions worldwide and particularly in developing countries. This study aims the determination of anthropogenic inputs with trace metals in aquatic ecosystems at the Plain of Annaba (NE Algeria), which is known as one of the largest industrial areas in Africa. Samples of surface waters and upper sediments were conducted in six stations: four in Meboudja wadi and two in Seybouse wadi. Contents of iron, copper, chromium, nickel, zinc, and manganese were measured by atomic absorption spectrophotometry, whereas Cd and Pb were determined using electrothermal atomic absorption spectrometry...
June 2017: Environmental Monitoring and Assessment
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