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https://www.readbyqxmd.com/read/28644646/bottleneck-accumulation-of-hybrid-magnetoelastic-bosons
#1
Dmytro A Bozhko, Peter Clausen, Gennadii A Melkov, Victor S L'vov, Anna Pomyalov, Vitaliy I Vasyuchka, Andrii V Chumak, Burkard Hillebrands, Alexander A Serga
An ensemble of magnons, quanta of spin waves, can be prepared as a Bose gas of weakly interacting quasiparticles. Furthermore, the thermalization of the overpopulated magnon gas through magnon-magnon scattering processes, which conserve the number of particles, can lead to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum. However, magnon-phonon scattering can significantly modify this scenario and new quasiparticles are formed-magnetoelastic bosons. Our observations of a parametrically populated magnon gas in a single-crystal film of yttrium iron garnet by means of wave-vector-resolved Brillouin light scattering spectroscopy evidence a novel condensation phenomenon: A spontaneous accumulation of hybrid magnetoelastic bosonic quasiparticles at the intersection of the lowest magnon mode and a transversal acoustic wave...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28642952/solventless-mechanochemical-preparation-of-novel-magnetic-bioconjugates
#2
Daily Rodriguez-Padrón, Alain R Puente-Santiago, Alina M Balu, Antonio A Romero, Rafael Luque
A solventless mechanochemical approach was employed to obtain a bioconjugate (BSA-DA-Fe2O3) based on bovine serum albumin (BSA) and dopamine (DA) coated iron oxide magnetic nanoparticles. UV-vis measurements of the obtained material showed a distinctive peak at 280 nm which, together with the presence of N on the surface of the nanomaterial (a band at 400 eV in the XPS spectrum) and zeta potential measurements, confirmed the successful immobilization of the protein. Additionally, the presence of two bands at 1652 and 1545 cm(-1) in the FT-IR spectra of both BSA and BSA-DA-Fe2O3 and steady-state fluorescence analysis validated that the protein preserved its native-like structure after the mechanochemical milling process...
June 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28640222/albumin-and-hyaluronic-acid-coated-superparamagnetic-iron-oxide-nanoparticles-loaded-with-paclitaxel-for-biomedical-applications
#3
Elena Vismara, Chiara Bongio, Alessia Coletti, Ravit Edelman, Andrea Serafini, Michele Mauri, Roberto Simonutti, Sabrina Bertini, Elena Urso, Yehuda G Assaraf, Yoav D Livney
Super paramagnetic iron oxide nanoparticles (SPION) were augmented by both hyaluronic acid (HA) and bovine serum albumin (BSA), each covalently conjugated to dopamine (DA) enabling their anchoring to the SPION. HA and BSA were found to simultaneously serve as stabilizing polymers of Fe₃O₄·DA-BSA/HA in water. Fe₃O₄·DA-BSA/HA efficiently entrapped and released the hydrophobic cytotoxic drug paclitaxel (PTX). The relative amount of HA and BSA modulates not only the total solubility but also the paramagnetic relaxation properties of the preparation...
June 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28639348/cell-specificity-of-magnetic-cell-seeding-approach-to-hydrogel-colonization
#4
Raminder Singh, Anna Wieser, Supachai Reakasame, Rainer Detsch, Barbara Dietel, Christoph Alexiou, Aldo R Boccaccini, Iwona Cicha
Tissue-engineered scaffolds require an effective colonization with cells. Superparamagnetic iron oxide nanoparticles (SPIONs) can enhance cell adhesion to matrices by magnetic cell seeding. We investigated the possibility of improving cell attachment and growth on different alginate-based hydrogels using fibroblasts and endothelial cells loaded with SPIONs. Hydrogels containing pure alginate (Alg), alginate dialdehyde crosslinked with gelatin (ADA-G) and Alg blended with G or silk fibroin (SF) were prepared...
June 22, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28635132/the-fabrication-of-iron-oxide-nanoparticle-nanofiber-composites-by-electrospinning-and-their-applications-in-tissue-engineering
#5
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/28631237/structural-characterization-of-pyoverdines-produced-by-pseudomonas-putida-kt2440-and-pseudomonas-taiwanensis-vlb120
#6
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
https://www.readbyqxmd.com/read/28630181/in-vitro-activity-of-the-siderophore-cephalosporin-cefiderocol-against-a-recent-collection-of-clinically-relevant-gram-negative-bacilli-from-north-america-and-europe-including-carbapenem-non-susceptible-isolates-the-sidero-wt-2014-study
#7
Meredith A Hackel, Masakatsu Tsuji, Yoshinori Yamano, Roger Echols, James A Karlowsky, Daniel F Sahm
Cefiderocol (formerly S-649266) is an investigational siderophore cephalosporin. Iron-depleted cation-adjusted Mueller-Hinton broth (ID-CAMHB) was prepared according to the Clinical and Laboratory Standards Institute (CLSI) protocol and used to perform broth microdilution testing of cefiderocol against a 2014-2015 collection of clinical isolates of gram-negative bacilli from North America (n=4,239) and Europe (n=4,966). The concentration of cefiderocol inhibiting 90% of isolates tested (MIC90) was: 0.5 (North America; n=3,007) and 1 μg/ml (Europe; n=3,080) for all isolates of Enterobacteriaceae; 1 (North America; n=30) and 4 μg/ml (Europe; n=139) for meropenem-non-susceptible (MIC ≥2 μg/ml) isolates of Enterobacteriaceae; 0...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28629053/a-novel-high-strength-and-highly-corrosive-biodegradable-fe-pd-alloy-structural-mechanical-and-in-vitro-corrosion-and-cytotoxicity-study
#8
Jaroslav Čapek, Šárka Msallamová, Eva Jablonská, Jan Lipov, Dalibor Vojtěch
Recently, iron-based materials have been considered as candidates for the fabrication of biodegradable load-bearing implants. Alloying with palladium has been found to be a suitable approach to enhance the insufficient corrosion rate of iron-based alloys. In this work, we have extensively compared the microstructure, the mechanical and corrosion properties, and the cytotoxicity of an FePd2 (wt%) alloy prepared by three different routes - casting, mechanical alloying and spark plasma sintering (SPS), and mechanical alloying and the space holder technique (SHT)...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628326/improved-sodium-ion-storage-performance-of-ultrasmall-iron-selenide-nanoparticles
#9
Feipeng Zhao, Sida Shen, Liang Cheng, Lu Ma, Junhua Zhou, Hualin Ye, Na Han, Tianpin Wu, Yanguang Li, Jun Lu
Sodium-ion batteries are potential low-cost alternatives to current lithium-ion technology, yet their performance still fall short of expectation due to the lack of suitable electrode materials with large capacity, long-term cycling stability and high-rate performance. In this work, we demonstrated that ultrasmall (~5 nm) iron selenide (FeSe2) nanoparticles exhibited a remarkable performance for sodium-ion storage. They were prepared from a high-temperature solution method with a narrow size distribution and high yield, and could be readily redispersed in non-polar organic solvents...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28623453/introducing-a-novel-media-to-improve-the-recovery-of-culturable-bacteria-from-the-fish-parasite-anisakis-spp-larvae-nematoda-anisakidae
#10
Cecilie S Svanevik, Bjørn T Lunestad
This paper describes a cultivation method to increase the recovery of bacteria from the marine muscle-invading parasitic nematode larvae of Anisakis spp. These larvae hold a high and complex population of accumulated bacteria, originating from seawater, crustaceans, fish, and marine mammals, all involved in the lifecycle of Anisakis. Two in-house agars based on fish juice prepared by either mechanical or enzymatic degradation of the fish tissue, were made. The Anisakis larvae were homogenised prior to cultivation on the in-house fish juice agars and the bacterial numbers and diversity were compared to those obtained applying the commercially available Marine Agar and Iron Agar Lyngby...
June 16, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28622779/-iron-in-nutrition
#11
P Tounian, J-P Chouraqui
Iron deficiency is the main nutritional disease worldwide. The multidisciplinary working group of the French Pediatric Society on iron assessed the following recommendations. Since iron is variably absorbed depending on foods, the group defined absorbed iron requirements instead of dietary iron requirements. Iron-rich foods should be introduced at 4-months of age in some breast-fed infants. Between 7 and 11 month-old, formula-fed infants should drink at least 700ml per day of follow-on formula and partially or totally breast-fed infants should receive oral iron supplementation...
May 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/28621407/determination-of-microelements-in-human-milk-and-infant-formula-without-digestion-by-icp-oes
#12
Dijana Đurović, Branka Milisavljević, Mirjana Nedović-Vuković, Branislav Potkonjak, Snežana Spasić, Miroslav Vrvić
The concentrations of zinc (Zn), iron (Fe) and copper (Cu) in both human milk and infant formula were determined using a new sample preparation method, by inductively coupled plasma - optical emission spectometry (ICP-OES) and flame atomic absorption spectrometry (FAAS). Human milk samples were diluted in ultrapure water. The infant formula of powder samples (suitable for an infant 1-6 months of age) and standard reference material (SRM-1849) were analyzed in parallel. The results have shown that FAAS method was more sensitive for Fe determination in human milk while ICP-OES was more sensitive for both Zn and Cu detection...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621399/-mii-ncs-2-nia-2-oh2-2-preparation-crystal-structure-and-thermal-properties-mii-mn-fe-nia-nicotinamide
#13
Marta Počkaj, Nives Kitanovski, Boris Čeh, Romana Cerc-Korošec
Two novel isostructural coordination compounds of manganese(II) (1) and iron(II) (2) with common formulae [MII(NCS)2(nia)2(OH2)2] have been prepared from water solution of appropriate metal salt, nicotinamide and KSCN. Their crystal structures were determined by means of X-ray diffraction on single crystals. The mononuclear title compounds crystallize in a triclinic P-1 space group with six monodentate octahedrally arranged ligands around the metal centre. The coordination molecules are self-assembled with an extended network of hydrogen bonds into a three-dimensional structure...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621074/editorial-which-iron-preparation-for-patients-with-ibd-authors-reply
#14
EDITORIAL
A Aksan, H Işık, H H Radeke, A Dignass, J Stein
No abstract text is available yet for this article.
July 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28621066/editorial-which-iron-preparation-for-patients-with-ibd
#15
EDITORIAL
N A Kennedy, J R Goodhand, D S Rampton
No abstract text is available yet for this article.
July 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28618369/characterization-and-quantification-of-chromate-adsorption-by-layered-porous-iron-oxyhydroxide-an-experimental-and-theoretical-study
#16
Zongsu Wei, Shuang Luo, Ruiyang Xiao, Rafail Khalfin, Raphael Semiat
The inner structure of iron oxyhydroxide agglomerates (IOAs) prepared from hydrolysis of ferric chloride was characterized and correlated to surface complexation of hexavalent chromium, Cr(VI), in a broad range of pH (3-12) and ionic strengths (0.0-5.0M). Evolution of particle size, morphology, and surface activity, combined with density functional theory (DFT) calculations, support the condensation reaction initiated formation of IOAs in three levels: iron nanoparticles to nanolayers to agglomerates. This agglomeration process led to a layered porous structure for aqueous-phase IOAs resulting in a rapid and high removal of Cr(VI) in batch tests...
June 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28616783/a-search-for-glomuferrin-a-potential-siderophore-of-arbuscular-mycorrhizal-fungi-of-the-genus-glomus
#17
Günther Winkelmann
Most fungi are known to synthesize siderophores under iron limitation. However, arbuscular mycorrhizal fungi (AM fungi) have so far not been reported to produce siderophores, although their metabolism is iron-dependent. In an approach to isolate siderophores from AM fungi, we have grown plants of Tagetes patula nana in the presence of spores from AM fungi of the genus Glomus (G. etunicatum, G. mossae & unidentified Glomus sp.) symbiotically under iron limitation and sterile conditions. A siderophore was isolated from infected roots after 2-3 weeks of growth in pots containing low-iron sand with Hoagland solution...
June 14, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28616135/carbon-dioxide-binding-at-a-ni-fe-center-synthesis-and-characterization-of-ni-%C3%AE-1-co2-%C3%AE%C2%BAc-and-ni-%C3%AE-co2-%C3%AE%C2%BAc-%C3%AE%C2%BA-2-o-o-fe
#18
Changho Yoo, Yunho Lee
The degree of CO2 activation can be tuned by incorporating a distinct electronic coordination environment at the nickel center. A mononuclear nickel carboxylate species (Ni-CO2, 3) and a dinuclear nickel-iron carboxylate species (Ni-CO2-Fe, 5) were prepared. The structure of 3 reveals a rare η(1)-κC binding mode of CO2, while that of 5 shows bridging CO2 binding (μ2-κC:κ(2)O,O') between the nickel and iron, presented as the first example of a nickel-μ-CO2-iron species. The structural analyses of 3 and 5 based on XRD and DFT data reveal a higher degree of CO2 activation in 5, imparted by the additional interaction with an iron ion...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28615257/randomized-controlled-trial-assessing-the-efficacy-of-a-reusable-fish-shaped-iron-ingot-to-increase-hemoglobin-concentration-in-anemic-rural-cambodian-women
#19
Aviva I Rappaport, Kyly C Whitfield, Gwen E Chapman, Rickey Y Yada, Khin Meng Kheang, Jennie Louise, Alastair J Summerlee, Gavin R Armstrong, Timothy J Green
Background: Anemia affects 45% of women of childbearing age in Cambodia. Iron supplementation is recommended in populations in which anemia prevalence is high. However, there are issues of cost, distribution, and adherence. A potential alternative is a reusable fish-shaped iron ingot, which, when added to the cooking pot, leaches iron into the fluid in which it is prepared.Objective: We sought to determine whether there was a difference in hemoglobin concentrations in rural Cambodian anemic women (aged 18-49 y) who cooked with the iron ingot or consumed a daily iron supplement compared with a control after 1 y...
June 14, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28609726/removal-of-tetracycline-from-aqueous-solution-by-mcm-41-zeolite-a-loaded-nano-zero-valent-iron-synthesis-characteristic-adsorption-performance-and-mechanism
#20
Yige Guo, Wenli Huang, Bin Chen, Ying Zhao, Dongfang Liu, Yu Sun, Bin Gong
In this study, nano zero valent iron (NZVI) modified MCM-41-zeolite A (Fe-MCM-41-A) composite as a novel adsorbent was prepared by precipitation method and applied for tetracycline (TC) removal from aqueous solution. The adsorbent was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and N2-BET analysis. Hysteresis loops indicated that the sample has a desirable magnetic property and can be separated quickly...
June 6, 2017: Journal of Hazardous Materials
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