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https://www.readbyqxmd.com/read/29458085/the-effect-of-surface-charge-and-ph-on-the-physiological-behaviour-of-cobalt-copper-manganese-antimony-zinc-and-titanium-oxide-nanoparticles-in-vitro
#1
Tiina Titma
The precise knowledge on various interactions of metal nanoparticles (NP) in a living organism is scarce. It is expected that metals can bind to nucleic acids, peptides and proteins (e.g. enzymes), and modify the functioning of vital cellular compartments after entering the organism. The predictive factors for quantitative nanostructure-activity relationship (QNAR) analysis could enhance efficient and harmless usage of nanoparticles (NPs) in the industry as well in the medicine. The studies value the composition of the NP corona determined by time, temperature and source of protein which has been found to implicate the physiological behaviour of NPs...
February 16, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29458079/autofluorescence-a-potential-pitfall-in-immunofluorescence-based-inflammation-grading
#2
Jonas Wizenty, Muhammad Imtiaz Ashraf, Nadine Rohwer, Martin Stockmann, Sascha Weiss, Matthias Biebl, Johann Pratschke, Felix Aigner, Tilo Wuensch
Immunofluorescence (IF) staining of paraffin-embedded tissues is a frequently used method to answer research questions or even detect the abundance of a certain protein for diagnostic use. However, the signal originating from specific antibody-staining might be distorted by autofluorescence (AF) of the assessed tissue. Although the AF phenomenon is well known, its presence is often neglected by insufficient staining controls. In this study, we describe the existence of cellular AF in paraffin-embedded healthy and inflamed human and murine colonic tissues and present ways to reduce AF...
February 16, 2018: Journal of Immunological Methods
https://www.readbyqxmd.com/read/29457981/reversible-surface-engineering-via-nitrone-mediated-radical-coupling
#3
Joachim Laun, Wouter Marchal, Vanessa Trouillet, Alexander Welle, An T Hardy, Marlies K Van Bael, Christopher Barner-Kowollik, Tanja Junkers
Efficient and simple polymer conjugation reactions are critical for introducing functionalities on surfaces. For polymer surface grafting, post polymerization modifications are often required, which can impose a significant synthetic hurdle. Here, we report two strategies that allow for reversible surface engineering via nitrone-mediated radical coupling (NMRC). Macroradicals stemming from activation of polymers generated by copper-mediated radical polymerization are grafted via radical trapping with a surface-immobilized nitrone or a solution-borne nitrone...
February 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29457817/electron-transfer-rate-analysis-of-a-site-specifically-wired-copper-oxidase
#4
Orr Schlesinger, Mor Pasi, Rambabu Dandela, Michael M Meijler, Lital Alfonta
Electron transfer kinetic parameters of site-specifically wired copper oxidase were investigated. The enzyme's orientation towards the electrode was controlled by incorporation of propargyl-l-lysine as a site-specific anchoring point. Herein, we demonstrate the importance of immobilization orientation and how it affects electron transfer efficiency and kinetics to each of the enzyme's two active sites.
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29457813/copper-catalyzed-synthesis-of-%C3%AE-amino-nitriles-through-methyl-transfer-from-dmf-to-aromatic-amines
#5
Zaifeng Yuan, Na Li, Chunyu Zhu, Chengfeng Xia
A copper-catalyzed activation of C(sp3 )-H bonds of DMF at room temperature was developed, which results in methyl transfer to aromatic amines for efficient synthesis of exceedingly valuable α-amino nitriles. This process features excellent functional group tolerance, a broad substrate scope, and high activity under ambient conditions.
February 19, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29457807/copper-i-and-silver-i-complexes-of-9-9-dimethyl-4-5-bis-di-tert-butylphosphino-xanthene-photophysical-properties-and-structural-rigidity-under-pressure
#6
Sarah Keller, Alessandro Prescimone, Edwin C Constable, Catherine E Housecroft
The heteroleptic complexes [Cu(tBu-xantphos)(bpy)][PF6 ] and [Ag(tBu-xantphos)(bpy)][PF6 ], where tBu-xantphos = 9,9-dimethyl-4,5-bis(di-tert-butylphosphino)xanthene and bpy = 2,2'-bipyridine have been synthesized and their photophysical properties investigated. Single crystal X-ray diffraction studies of the compounds under ambient and increased pressure are presented; increase in pressure results in little structural perturbation. For the copper(i) complexes, the effects of changing the N^N ligand from bpy to 6-methyl-2,2'-bipyridine (6-Mebpy), 6-bromo-2,2'-bipyridine (6-Brbpy), and 4,4'-di(tert-butyl)-2,2'-bipyridine (4,4'-tBu2 bpy) were also investigated...
February 19, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29457695/functionalization-of-a-nanostructured-hydroxyapatite-with-copper-ii-compounds-as-pesticide-in-situ-tem-and-esem-observations-of-treated-vitis-vinifera-l-leaves
#7
Enrico Battiston, Maria C Salvatici, Alessandro Lavacchi, Antonietta Gatti, Stefano Di Marco, Laura Mugnai
BACKGROUND: The present study evaluates a biocompatible material for plant protection to reduce the amount of active substance applied. We used a synthetic hydroxyapatite (HA) that has been studied extensively due its bioactivity and biocompatibility. Aggregation between HA nanoparticles and four copper(II) compounds applied in Vitis vinifera L. leaves as pesticide was studied. Formulations were characterised by XRD, DLS, electron microscopy and applied in planta to verify the particle aggregation and efficiency in controlling the pathogen, Plasmopara viticola...
February 19, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29457663/tandem-functionalization-in-one-highly-branched-polymer-with-layered-structure
#8
Xiaosong Cao, Yi Shi, Weiping Gan, Haifeng Gao
In this report, we developed a hyperbranched polymer with multi-layer structure to demonstrate the possibility of highly efficient tandem functionalization reactions at different domains within one nanostructured platform. The polymer scaffold was constructed using the chain-growth copper-catalyzed azide-alkyne cycloaddition (CuAAC) polymerization of three functional monomers with sequential monomer addition in one pot. Subsequent reactions onto different monomer units exhibited efficient functionalization in each segment, constructing a highly sophisticated polymer structure via a robust procedure...
February 19, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29457214/maintenance-zinc-therapy-after-initial-penicillamine-chelation-to-treat-symptomatic-hepatic-wilson-s-disease-in-resource-constrained-setting
#9
Piyush Gupta, Mehul Choksi, Ashish Goel, Uday Zachariah, Kattiparambil Gangadharan Sajith, Jeyamani Ramachandran, George Chandy, George Kurian, Grace Rebekah, Chundamannil Eapen Eapen
BACKGROUND: Experience with zinc in treating symptomatic hepatic Wilson's disease (WD) is limited. AIM: To study the efficacy of Penicillamine followed by zinc in treating symptomatic hepatic Wilson's disease. METHODS: We retrospectively analyzed case records of 31 symptomatic hepatic WD patients for whom disease severity scores (Child's, model for end-stage liver disease (MELD), Nazer's, and New Wilson Index (NWI) score) and 24-h urinary copper were compared at 3-time points-baseline at presentation, at transition from penicillamine to zinc and at end of follow up...
February 19, 2018: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/29457161/a-self-supported-amorphous-ni-p-alloy-on-a-cuo-nanowire-array-an-efficient-3d-electrode-catalyst-for-water-splitting-in-alkaline-media
#10
Bing Chang, Shuai Hao, Zhixiang Ye, Yingchun Yang
Energy-efficient electrochemical water splitting is one important way to produce hydrogen fuel but still faces many challenges. In this communication, we report that an amorphous Ni-P alloy shell electrodeposited on a CuO nanowire array supported on copper foam (CuO@Ni-P NA/CF) can be used for efficient water splitting in alkaline media. As a 3D catalytic electrode, it exhibits excellent activity both for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with overpotentials of 106 mV for HER and 275 mV for OER to achieve a current density of 30 mA cm-2 in 1...
February 19, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29455988/fabrication-of-novel-nanohybrids-by-impregnation-of-cuo-nanoparticles-into-bacterial-cellulose-and-chitosan-nanofibers-characterization-antimicrobial-and-release-properties
#11
Hadi Almasi, Paria Jafarzadeh, Laleh Mehryar
The efficiency of bacterial cellulose nanofibers (BCNF) and chitosan nanofibers (CHNF) were compared, aiming at fabricating novel organic-inorganic nanohybrids containing copper oxide (CuO) nanoparticles (NPs). FT-IR spectra confirmed the formation of real nanohybrids through occurring new interactions between CuO NPs and nanofibers. XRD results indicated that both the crystallite size and the crystallinity index of nanofibers decreased after nanohybrid formation. Noticeably, these morphological changes for CHNF were more than those for BCNF...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455985/pd-hnts-cdns-g-c-3-n-4-a-novel-heterogeneous-catalyst-for-promoting-ligand-and-copper-free-sonogashira-and-heck-coupling-reactions-benefits-from-halloysite-and-cyclodextrin-chemistry-and-g-c-3-n-4-contribution-to-suppress-pd-leaching
#12
Samahe Sadjadi, Majid M Heravi, Masoumeh Malmir
For the first time, a ternary hybrid system composed of halloysite nanotubes, HNTs, cyclodextrin nanosponges, CDNS, and g-C3 N4 is prepared and used for immobilization of Pd(0) nanoparticles and development of a heterogeneous catalyst, Pd@HNTs-CDNS-g-C3 N4 for promoting ligand and copper-free Sonogashira and Heck coupling reactions in aqueous media. HNT as a porous tubular clay with outstanding thermal, mechanical and textural properties can act as a support for immobilizing Pd nanoparticles. The role of CDNS can be explained on the base of its capability to form inclusion complexe with substrates and bringing them in the vicinity of the catalytic active sites...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455971/chitosan-based-ion-imprinted-cryo-composites-with-excellent-selectivity-for-copper-ions
#13
Maria Valentina Dinu, Ionel Adrian Dinu, Maria Marinela Lazar, Ecaterina Stela Dragan
An original strategy is proposed here to design chitosan-based ion-imprinted cryo-composites (II-CCs) with pre-organized recognition sites and tailored porous structure by combining ion-imprinting and ice-templating techniques. The cryo-composites showed a tube-like porous morphology with interconnected parallel micro-channels, the distance between the channel walls being around 15 μm. Both the entrapment of a natural zeolite and the presence of carboxylate groups, generated by partial hydrolysis of amide moieties, led to II-CCs with controlled swelling ratios (25-40 g/g, depending on pH) and enhanced overall chelating efficiency (260 mg Cu2+ /g composite)...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455578/evaluating-the-effects-of-copper-supplement-during-pregnancy-on-premature-rupture-of-membranes-and-pregnancy-outcome-some-statistical-issues
#14
Ahmed M Abbas
No abstract text is available yet for this article.
February 18, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29455525/graphene-oxide-decorated-with-cerium-iv-oxide-in-determination-of-ultra-trace-metal-ions-and-speciation-of-selenium
#15
Anna Baranik, Rafal Sitko, Anna Gagor, Ignasi Queralt, Eva Margui, Beata Zawisza
Graphene oxide decorated with cerium (IV) oxide (GO/CeO2) was synthesized and applied in adsorption of several metal ions such as As(III), As(V), Se(IV), Cu(II) and Pb(II) from aqueous samples. The important feature of GO/CeO2 nanocomposite is also its selectivity towards selenite in the presence of selenate. The structure of GO/CeO2 has been proven by microscopic and spectroscopic techniques. The maximum adsorption capacities of GO/CeO2 calculated by Langmuir model towards arsenic, selenium, copper and lead ions are between 6 and 30 mg g-1...
February 18, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29455521/self-assembly-of-binuclear-cu-ii-histidine-complex-for-absolute-configuration-and-enantiomeric-excess-determination-of-naproxen-by-tandem-mass-spectrometry
#16
Xiangying Yu, Man-Chu Chau, Wai Kit Tang, Chi-Kit Siu, Zhong-Ping Yao
Naproxen is one of the most consumed non-steroidal anti-inflammatory drugs and marketed as S-naproxen since R-naproxen is hepatotoxic. In this study, chiral recognition of naproxen has been investigated by tandem mass spectrometry (MS/MS). Among all diastereomeric complexes formed between naproxen and the examined chiral selectors, including cyclodextrins (α/β/γ-CD), modified phenylalanines (N-acetyl-phenylalanine, N-t-butoxycarbonyl-phenylalanine, N-9-fluorenylmethyloxycarbonyl-phenylalanine), amino acids (Trp, Phe, Tyr, His), glucose, tartaric acid and vancomycin, a novel binuclear metal bound diastereomeric complexes [(M(II))2 (S/R-Naproxen)(L-His)2 -3H]+ (M = Cu, Ni or Co with Cu being the best) could allow effective identification of the absolute configuration of naproxen and determination of its enantiomeric excess (ee) through MS/MS analysis...
February 17, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29455434/elucidating-post-translational-regulation-of-mouse-creb3-in-neuro2a-cells
#17
Kentaro Oh-Hashi, Ayano Soga, Yoshihisa Naruse, Kanto Takahashi, Kazutoshi Kiuchi, Yoko Hirata
CREB3 is an ER membrane-bound transcription factor; however, post-translational regulation of CREB3, including expression, processing, and activation, is not fully characterized. We therefore constructed several types of mouse CREB3 expression genes and elucidated their expression in Neuro2a cells by treatment with stimuli and co-transfection with genes associated with ER-Golgi homeostasis, such as mutant Sar1 [H79G], GRP78, and KDEL receptor 1 (KDELR1). Interestingly, treatment of Neuro2a cells expressing Flag-tagged full-length CREB3 with monensin and nigericin induced the expression of the approximately 50 kDa N-terminal fragment; however, its cleavage was not parallel to the levels of GADD153 and LC3-II...
February 17, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29455289/fluoride-alters-serum-elemental-calcium-magnesium-copper-and-zinc-homeostasis-along-with-erythrocyte-carbonic-anhydrase-activity-in-fluorosis-endemic-villages-and-restores-on-supply-of-safe-drinking-water-in-school-going-children-of-nalgonda-district-india
#18
Arjun L Khandare, Vakdevi Validandi, Naveen Boiroju
The present study aimed to determine the serum trace elements (copper (Cu), zinc (Zn), calcium (Ca), magnesium (Mg)) along with erythrocyte carbonic anhydrase (CA) activity and effect of intervention with safe drinking water for 5 years in the school children of fluorosis endemic area. For this purpose, three categories of villages were selected based on drinking water fluoride (F): Category I (control, F = 1.68 mg/L), category II (affected F = 3.77 mg/L), and category III (intervention village) where initial drinking water F was 4...
February 17, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29455113/experimental-study-and-simulation-of-63-zn-production-via-proton-induce-reaction
#19
Malihe Rostampour, Mahdi Sadeghi, Mohammadreza Aboudzadeh, Saeid Hamidi, Naser Soltani, Fatemeh Bolouri Novin, Ali Rahiminejad, Saeid Rajabifar
The63 Zn was produced by16.8 MeV proton irradiation of natural copper. Thick target yield for63 Zn in the energy range of 16.8 →12.2 MeV was 2.47 ± 0.12 GBq/μA.h. Reasonable agreement between achieved experimental data and theoretical value of thick target yield for63 Zn was observed. A simple separation procedure of63 Zn from copper target was developed using cation exchange chromatography. About 88 ± 5% of the loaded activity was recovered. The performance of FLUKA to reproduce experimental data of thick target yield of63 Zn is validated...
February 5, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29454300/gold-copper-bimetallic-nanoparticles-supported-on-nano-p-zeolite-modified-carbon-paste-electrode-as-an-efficient-electrocatalyst-and-sensitive-sensor-for-determination-of-hydrazine
#20
Fatemeh Amiripour, Seyed Naser Azizi, Shahram Ghasemi
In this report, a facile, efficient and low cost electrochemical sensor based on bimetallic Au-Cu nanoparticles supported on P nanozeolite modified carbon paste electrode (Au-Cu/NPZ/CPE) was constructed and its efficiency for determination of hydrazine in trace level was studied. For this purpose, agro waste material, stem sweep ash (SSA) was employed as the starting material (silica source) for the synthesis of nano P zeolite (NPZ). After characterization of the synthesized NPZ by analytical instruments (scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy), construction of Au-Cu/NPZ/CPE was performed by three steps procedure involving preparation of nano P zeolite modified carbon paste electrode (NPZ/CPE), introducing Cu +2 ions into nano zeolite structure by ion exchange and electrochemical reduction of Cu +2 ions upon applying constant potential...
February 5, 2018: Biosensors & Bioelectronics
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