238,655 results match your criteria iron


Iron and chromium co-doped cobalt phosphide porous nanosheets as robust bifunctional electrocatalyst for efficient water splitting.

Nanotechnology 2021 Sep 23. Epub 2021 Sep 23.

School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, CHINA.

It is still a huge challenge to develop highly efficient and low-cost non-precious metal-based electrocatalysts for overall water splitting in alkaline electrolytes. Herein, Cr and Fe co-doped CoP porous mesh nanosheets (Mesh-CrFe-CoP NSs) were synthesized through hydrolysis reaction, ion exchange etching and subsequent low-temperature phosphating process. The Mesh-CrFe-CoP NSs provides overpotentials at a current density of 10 mA cm-2 under alkaline electrolyte of 103. Read More

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September 2021

Protonation of the oxo-bridged heme/copper assemblies: Modeling the oxidized state of the cytochrome c oxidase active site.

J Inorg Biochem 2021 Aug 27;225:111593. Epub 2021 Aug 27.

Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, USA. Electronic address:

In this study on model compounds for the resting oxidized state of the iron‑copper binuclear center in cytochrome c oxidase (CcO), we describe the synthesis of a new μ-oxo-heme/Cu complex, [(TPP)Fe-O-Cu(tmpa)][B(CF)] (2) {TPP: tetraphenyl porphyrinate(2-); TMPA: tris(2-pyridylmethylamine)}, as well as two protonation events for three μ-oxo-heme/Cu complexes with varying peripheral substituents on the heme site. The addition of increasing amounts of strong acid to these μ-oxo-heme/Cu systems successively led to the generation of the corresponding μ-hydroxo, μ-aquo, and the dissociated complexes. The heme/Cu assemblies bridged through a water ligand are reported here for the first time and the H NMR and F NMR spectral properties are consistent with antiferromagnetically coupled high-spin iron(III) and copper(II) centers. Read More

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Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system.

Chemosphere 2021 Sep 13;287(Pt 3):132249. Epub 2021 Sep 13.

Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100123, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.

Nano-zero-valent iron (nZVI), as a typical nano-material, has been recently used in wastewater treatment and combination with bioreactors. Using nZVI coupled denitrification system research the effect and influence of nZVI enhanced denitrification sludge on the degradation of toxic compounds and system performance. The nZVI coupled denitrification system showed better resistance to 2,6-DCP impact, and the concentrations of effluent NO and NO were below 2. Read More

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September 2021

AMPHIPHILIC WATER-LEAN CARBON CAPTURE SOLVENT WETTING BEHAVIOR VIA DECOMPOSITION BY STAINLESS-STEEL INTERFACES.

ChemSusChem 2021 Sep 23. Epub 2021 Sep 23.

Pacific Northwest National Laboratory, Energy and Environment, 902 Battelle Boulevard, 99352, Richland, UNITED STATES.

We report on a combined experimental and theoretical study of the wetting and reactivity of water-lean carbon capture solvents on the surface of common column packing materials. Paradoxically, we find that these solvents are equally able to wet hydrophobic and hydrophilic surfaces. The solvents are amphiphilic and are able to adapt to any interfacial environment due to their inherent heterogeneous (non-ionic/ionic) molecular structure. Read More

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September 2021

Effects of B Heterogeneity on Spin Echo-Based Liver Iron Estimates.

J Magn Reson Imaging 2021 Sep 23. Epub 2021 Sep 23.

Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA.

Background: Liver iron concentration (LIC) measured by MRI has become the clinical reference standard for managing iron overload in chronically transfused patients. Transverse relaxivity (R or R ) measurements are converted to LIC units using empirically derived calibration curves.

Hypothesis: That flip angle (FA) error due to B spatial heterogeneity causes significant LIC quantitation error. Read More

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September 2021

Combining Multiple High-Resolution Techniques to Understand Phosphorous Availability Around Rice Roots.

Environ Sci Technol 2021 Sep 23. Epub 2021 Sep 23.

State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China.

Resolving chemical/biological drivers of P behavior around lowland/flooded rice roots remains a challenge because of the heterogeneity of the plant-soil interactions, compounded by sampling and analytical constraints. High-spatial-resolution (sub-mm) visualization enables these processes to be isolated, characterized, and deciphered. Here, three advanced soil imaging systems, diffusive gradients in thin-film technique coupled with laser ablation-ICPMS (DGT-LA-ICPMS), O planar optode, and soil zymography, were integrated. Read More

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September 2021

Activatable Biomineralized Nanoplatform Remodels the Intracellular Environment of Multidrug-Resistant Tumors for Enhanced Ferroptosis/Apoptosis Therapy.

Small 2021 Sep 23:e2102269. Epub 2021 Sep 23.

School of Life Sciences, Chongqing University, Huxi, G75 Lanhai, Chongqing, 400052, China.

Ferroptosis is a new form of regulated cell death with significant therapeutic prospect, but its application against drug-resistant tumor cells is challenging due to their ability to effuse antitumor agents via p-glycoprotein (P-gp) and anti-lipid peroxidation alkaline intracellular environment. Herein, an amorphous calcium phosphate (ACP)-based nanoplatform is reported for the targeted combinational ferroptosis/apoptosis therapy of drug resistant tumor cells by blocking the MCT4-mediated efflux of lactic acid (LA). The nanoplatform is fabricated through the biomineralization of doxorubicin-Fe (DOX-Fe ) complex and MCT4-inhibiting siRNAs (siMCT4) and can release them to the tumor cytoplasm after the hydrolysis of ACP and dissociation of DOX-Fe in the acidic lysosomes. Read More

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September 2021

Calcium Phosphate-Reinforced Metal-Organic Frameworks Regulate Adenosine-Mediated Immunosuppression.

Adv Mater 2021 Sep 23:e2102271. Epub 2021 Sep 23.

Institute of Chemical Biology and Nanomedicine, Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.

Long-term accumulation of adenosine (Ado) in tumor tissues helps to establish the immunosuppressive tumor microenvironment and to promote tumor development. Regulation of Ado metabolism is particularly pivotal for blocking Ado-mediated immunosuppression. The activity of adenosine kinase (ADK) for catalyzing the phosphorylation of Ado plays an essential role in regulating Ado metabolism. Read More

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September 2021

Spectroscopy-based multi-parametric quantification in subjects with liver iron overload at 1.5T and 3T.

Magn Reson Med 2021 Sep 23. Epub 2021 Sep 23.

Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Purpose: To evaluate the precision profile (repeatability and reproducibility) of quantitative STEAM-MRS and to determine the relationships between multiple MR biomarkers of chronic liver disease in subjects with iron overload at both 1.5 Tesla (T) and 3T.

Methods: MRS data were acquired in patients with known or suspected liver iron overload. Read More

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September 2021

Agro-morphological and genetic diversity studies in Rice (Oryza sativa L.) germplasm using microsatellite markers.

Mol Biol Rep 2021 Sep 23. Epub 2021 Sep 23.

Horticulture Technologies Production System Unit, Natural Resources Institute (Luke), Toivonlinnantie 518, 21500, Piikkiö, Finland.

Background: Knowledge of the genetic diversity and population structure of germplasm collections is an important foundation for crop improvement. Rice production across a broad range of rice-growing environments results in a diverse array of local rice varieties. Many rice varieties have been lost as a result of biodiversity loss and are now grown in Pakistan. Read More

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September 2021

Evaluating the treatment of heavy metals in acidic wastewater by activated carbon.

J Environ Sci Health A Tox Hazard Subst Environ Eng 2021 Sep 23:1-9. Epub 2021 Sep 23.

Centre of Environmental Management, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein, South Africa.

The study investigated the use of activated carbon (AC), produced from pinewood, to remove copper, zinc and iron from modified landfill leachates. South Africa faces an imminent water crisis, hence the need to see wastewater as an important source that must be treated and reused to combat water deficits in future. The use of AC as a soil amendment for the removal of heavy metals (HM) is not well researched. Read More

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September 2021

Evaluation of prenatal vitamin-mineral preparations in the context of recommended dietary supplementation. Are pregnant women supplied with what they should get?

Rocz Panstw Zakl Hig 2021 ;72(3):309-320

National Institute of Public Health NIH - National Research Institute, Department of Nutrition and Nutritional Value of Food, Warsaw, Poland.

Background: The composition of preparations, intended for pregnant women is an important issue of proper dietary supplementation. The range of such products on the market is very wide and their composition is not regulated by law.

Objectives: To evaluate the composition of preparations for pregnant women in the context of 2014 Polish Gynecological Society (PTG) recommendation and the 2020 recommendation of the Polish Society of Gynecologists and Obstetricians (PTGiP). Read More

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January 2021

Influence of dental magnets on human brain activity: A quantitative EEG analysis.

Spec Care Dentist 2021 Sep 22. Epub 2021 Sep 22.

Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Porur, Tamil Nadu, India.

Purpose: The magnetic field is known to attenuate mental depression, but it is not clear on the effect of dental magnets on human brain activity. Therefore, this study was to determine the influence of magnetic field from intraoral magnets on the human brain activity by analyzing the changes in alpha waves.

Materials And Methods: Twenty complete denture male patients aged between 50 and 60 years were included after their consent. Read More

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September 2021

Ferroptosis as a mechanism of neurodegeneration in Alzheimer's disease.

J Neurochem 2021 Sep 23. Epub 2021 Sep 23.

Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria, 3052, Australia.

Alzheimer's disease (AD) is the most prevalent form of dementia, with complex pathophysiology that is not fully understood. While β-amyloid plaque and neurofibrillary tangles define the pathology of the disease, the mechanism of neurodegeneration is uncertain. Ferroptosis is an iron-mediated programmed cell death mechanism characterised by phospholipid peroxidation that has been observed in clinical AD samples. Read More

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September 2021

Cerebrospinal Fluid Iron-Ferritin Ratio as a Potential Progression Marker for Parkinson's Disease.

Mov Disord 2021 Sep 23. Epub 2021 Sep 23.

Department of Neurology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, München, Germany.

Longitudinal PD CSF samples were subjected to ICP-MS and the total amount of iron and other bioelements was quantified. Additionally, ferritin and protein biomarkers of neurodegeneration were measured. Over time, mean iron levels significantly increased while levels of ferritin decreased. Read More

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September 2021

Ferroptosis-related lncRNA pairs to predict the clinical outcome and molecular characteristics of pancreatic ductal adenocarcinoma.

Brief Bioinform 2021 Sep 22. Epub 2021 Sep 22.

Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China.

Ferroptosis is a form of regulated cell death initiated by oxidative perturbations that can be blocked by iron chelators and lipophilic antioxidants, and ferroptosis may be the silver bullet treatment for multiple cancers, including immunotherapy- and chemotherapy-insensitive cancers such as pancreatic ductal adenocarcinoma (PDAC). Numerous studies have noted that long non-coding RNAs (lncRNAs) regulate the biological behaviour of cancer cells by binding to DNA, RNA and protein. However, few studies have reported the role of lncRNAs in ferroptosis processes and the function of ferroptosis-associated lncRNAs. Read More

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September 2021

Iron-catalyzed radical cascade cyclization of oxime esters with isocyanides: synthesis of 1-cyanoalkyl isoquinolines and 6-cyanoalkyl phenanthridines.

Org Biomol Chem 2021 Sep 23. Epub 2021 Sep 23.

School of Pharmacy, Fudan University, 826 Zhangheng Road, Zhangjiang Hi-tech Park, Pudong, Shanghai 201203, China.

An iron-catalyzed radical cascade cyclization of oxime esters with isocyanides for the synthesis of 1-cyanoalkyl isoquinolines and 6-cyanoalkyl phenanthridines has been developed. This demonstrates excellent functional group tolerance and broad substrate scope. A diverse range of potentially valuable 1-cyanoalkyl isoquinolines and 6-cyanoalkyl phenanthridines were obtained in moderate to good yields. Read More

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September 2021

A soluble iron(II)-phthalocyanine-catalyzed intramolecular C(sp)-H amination with alkyl azides.

Chem Commun (Camb) 2021 Sep 23. Epub 2021 Sep 23.

Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China.

Herein, we describe a soluble iron(II)-phthalocyanine, [Fe(BuPc)(py)] (Pc = phthalocyaninato(2-)), as an effective catalyst in intramolecular C(sp)-H bond amination, with alkyl azides as the nitrogen source, to afford the amination products in moderate to excellent yields with a broad substrate scope. Read More

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September 2021

Rational Design of Yolk-Shell ZnCo[email protected] Dual Carbon Architectures as Long-Life and High-Rate Anodes for Half/Full Na-Ion Batteries.

Small 2021 Sep 22:e2101887. Epub 2021 Sep 22.

School of New Energy, Bohai University, Jinzhou, 121013, P. R. China.

Transition-metal selenides (TMSs) have emerged as prospective anode materials for sodium ion batteries (SIBs), owing to their considerable theoretical capacity and intrinsic high electronic conductivity. Whereas, TMSs still suffer from poor rate capability and inferior cycling stability induced by sluggish kinetics and severe volume changes during de/sodiation processes. Herein, a hierarchical composite consisting of a zinc-cobalt bimetallic selenide yolk and nitrogen-doped double carbon shell (denoted as ZnCo[email protected]) is engineered and fabricated successfully. Read More

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September 2021

The Role of Fortified and Enriched Refined Grains in the US Dietary Pattern: A NHANES 2009-2016 Modeling Analysis to Examine Nutrient Adequacy.

Front Nutr 2021 6;8:655464. Epub 2021 Sep 6.

Nutrition Impact, Battle Creek, MI, United States.

While dietary recommendations call for greater whole-grain intake and reduced refined grain consumption, there are limited peer-reviewed studies examining the influence of fortified/enriched refined grains on nutrient adequacy. A modeling analysis using data from National Health and Nutrition Examination Survey (NHANES) 2009-2016 estimated usual daily intake of shortfall nutrients for Dietary Guidelines for Americans (DGA) in the current dietary pattern and when specific percentages of fortified/enriched refined grain foods (bread, ready-to-eat cereals, and all-grained foods) were removed from the diet (19-50-year-old adults, = 11,169; 51-99-year-old adults, = 9,641). While American adults are currently falling short of nutrient recommendations, eliminating 25, 50, and 100% of all grains consumed in the US dietary pattern resulted in a greater percentage of adults not meeting recommendations for several shortfall nutrients, including dietary fiber, folate DFE, iron, and magnesium. Read More

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September 2021

Plasmonic Imaging of Electrochemical Reactions at Individual Prussian Blue Nanoparticles.

Front Chem 2021 6;9:718666. Epub 2021 Sep 6.

Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, CA, United States.

Prussian blue is an iron-cyanide-based pigment steadily becoming a widely used electrochemical sensor in detecting hydrogen peroxide at low concentration levels. Prussian blue nanoparticles (PBNPs) have been extensively studied using traditional ensemble methods, which only provide averaged information. Investigating PBNPs at a single entity level is paramount for correlating the electrochemical activities to particle structures and will shed light on the major factors governing the catalyst activity of these nanoparticles. Read More

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September 2021

How Does Iron Deficiency Anemia Impact Outcomes following Revision Total Hip Arthroplasty?

Hip Pelvis 2021 Sep 6;33(3):140-146. Epub 2021 Sep 6.

Department of Orthopaedic Surgery, Maimonides Medical Center, Brooklyn, NY, USA.

Purpose: Studies have shown the prevalence of iron deficiency anemia (IDA) increasing worldwide, and currently the literature is limited on the impact of IDA on outcomes following revision total hip arthroplasty (RTHA). Therefore, the purpose of this study was to determine whether IDA patients undergoing RTHA have longer: 1) in-hospital lengths of stay (LOS); 2) medical complications; and 3) costs of care.

Materials And Methods: A retrospective query of a nationwide administrative claims database was performed. Read More

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September 2021

Plant-based Diet and Iron Deficiency Anemia in Sundanese Adolescent Girls at Islamic Boarding Schools in Indonesia.

J Nutr Metab 2021 11;2021:6469883. Epub 2021 Sep 11.

Department of Nutrition, Faculty of Health Science, Siliwangi University, Tasikmalaya 46115, Indonesia.

Background: Adolescent girls are at risk for iron deficiency anemia (IDA) due to the higher demand of iron for growth and the loss of blood during menstruation. Consumption of foods containing iron that have higher bioavailability can reduce the risk of IDA although diets that are largely plant-based, like those consumed by many Sundanese people, may not contain sufficient bioavailable iron. Here, we investigated the correlation between plant-based diets and IDA in adolescent Sundanese girls who were students at Islamic boarding schools in Indonesia. Read More

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September 2021

Widespread Supplement Intake and Use of Poor Quality Information in Elite Adolescent Swiss Athletes.

Int J Sport Nutr Exerc Metab 2021 Sep 22:1-8. Epub 2021 Sep 22.

Department of Elite Sport, Swiss Federal Institute of Sport Magglingen, Magglingen,Switzerland.

Compared with adult athletes, rather little is known about supplementation behavior in adolescent athletes. This study's aim was to determine elite adolescent athletes' supplement use and sources of information relating thereto. A total of 430 (87%) of 496 questioned athletes returned the anonymized questionnaire. Read More

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September 2021

Incidence and predictors of iron deficiency anaemia in parturients undergoing elective caesarean section at a tertiary hospital in New Zealand: a retrospective, observational cohort study.

BMC Pregnancy Childbirth 2021 Sep 22;21(1):645. Epub 2021 Sep 22.

Department of Anaesthesia and Pain Medicine, Counties Manukau Health, Auckland, 2025, New Zealand.

Background: Worldwide, iron deficiency anaemia in pregnancy is a significant problem which can be especially problematic when delivery is by caesarean section, a procedure associated with significant blood loss. Optimising iron stores pre-delivery remains an overarching goal. We aim to measure the incidence of iron deficiency anaemia in patients undergoing elective caesarean section at our institution and determine any associated predictors, as well as adverse outcomes. Read More

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September 2021

Mild gestational thrombocytopenia in primiparous women, does it affect risk of early postpartum hemorrhage? A retrospective cohort study.

J Matern Fetal Neonatal Med 2021 Sep 22:1-8. Epub 2021 Sep 22.

Department of Obstetrics & Gynecology, Shaare Zedek Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.

Purpose: To assess whether women with mild gestational thrombocytopenia have a higher risk of postpartum hemorrhage.

Methods: A retrospective computerized database. Primiparous women that delivered at our center (2005-2019) were included; we excluded women with possible etiologies for thrombocytopenia such as systemic lupus or coagulation disorders, and hypertensive disorder of pregnancy. Read More

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September 2021

Clinically Translatable Prevention of Anthracycline Cardiotoxicity by Dexrazoxane Is Mediated by Topoisomerase II Beta and Not Metal Chelation.

Circ Heart Fail 2021 Sep 23:CIRCHEARTFAILURE120008209. Epub 2021 Sep 23.

Department of Pharmacology, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic. (E.J., Z.P., P.K.-B., O.L.-P., M.Š.).

Background: Anthracycline-induced heart failure has been traditionally attributed to direct iron-catalyzed oxidative damage. Dexrazoxane (DEX)-the only drug approved for its prevention-has been believed to protect the heart via its iron-chelating metabolite ADR-925. However, direct evidence is lacking, and recently proposed TOP2B (topoisomerase II beta) hypothesis challenged the original concept. Read More

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September 2021

Age of Bottle Cessation and BMI-for-Age Percentile among Children Aged Thirty-Six Months Participating in WIC.

Child Obes 2021 Sep 22. Epub 2021 Sep 22.

Department of Public Health Sciences, University of North Carolina at Charlotte, Charlotte, NC, USA.

Children's age at bottle weaning typically ranges from 12 to 24 months. The recommended age of bottle weaning varies. The American Academy of Pediatrics recommends weaning by 12 months; The American Academy of Pediatric Dentistry recommends 12-15 months; The US Department of Agriculture recommends 18 months. Read More

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September 2021