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https://www.readbyqxmd.com/read/29166088/extraction-of-effective-solid-liquid-interfacial-free-energies-for-full-3d-solid-crystallites-from-equilibrium-md-simulations
#1
L A Zepeda-Ruiz, B Sadigh, A A Chernov, T Haxhimali, A Samanta, T Oppelstrup, S Hamel, L X Benedict, J L Belof
Molecular dynamics simulations of an embedded atom copper system in the isobaric-isenthalpic ensemble are used to study the effective solid-liquid interfacial free energy of quasi-spherical solid crystals within a liquid. This is within the larger context of molecular dynamics simulations of this system undergoing solidification, where single individually prepared crystallites of different sizes grow until they reach a thermodynamically stable final state. The resulting equilibrium shapes possess the full structural details expected for solids with weakly anisotropic surface free energies (in these cases, ∼5% radial flattening and rounded [111] octahedral faces)...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29160831/a-novel-detection-method-of-human-serum-albumin-based-on-the-poly-thymine-templated-copper-nanoparticles
#2
Mingjian Chen, Xinying Xiang, Kefeng Wu, Hailun He, Hanchun Chen, Changbei Ma
In this work, we developed a facile fluorescence method for quantitative detection of human serum albumin (HSA) based on the inhibition of poly(thymine) (poly T)-templated copper nanoparticles (CuNPs) in the presence of HSA. Under normal circumstances, poly T-templated CuNPs can display strong fluorescence with excitation/emission peaks at 340/610 nm. However, in the presence of HSA, it will absorb cupric ion, which will prevent the formation of CuNPs. As a result, the fluorescence intensity will become obviously lower in the presence of HSA...
November 21, 2017: Sensors
https://www.readbyqxmd.com/read/29158726/enhanced-aerobic-exercise-performance-in-women-by-a-combination-of-three-mineral-chelates-plus-two-conditionally-essential-nutrients
#3
Robert A DiSilvestro, Staci Hart, Trisha Marshall, Elizabeth Joseph, Alyssa Reau, Carmen B Swain, Jason Diehl
Background: Certain essential and conditionally essential nutrients (CENs) perform functions involved in aerobic exercise performance. However, increased intake of such nutrient combinations has not actually been shown to improve such performance. Methods: For 1 mo, aerobically fit, young adult women took either a combination of 3 mineral glycinate complexes (daily dose: 36 mg iron, 15 mg zinc, and 2 mg copper) + 2 CENs (daily dose: 2 g carnitine and 400 mg phosphatidylserine), or the same combination with generic mineral complexes, or placebo (n = 14/group)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29158701/study-of-dna-damage-caused-by-dipyrone-in-presence-of-some-transition-metal-ions
#4
Bruna Corrêa Roriz, Horacio Dorigan Moya
The DNA damage in the presence of dipyrone (used as its sodium salt, NaDip) and some transition metal ions in an air saturated ([O2] ≈ 0.25 mM) non-buffered solution at T = (25.0 ± 0.5)°C was investigated by agarose gel electrophoresis. As metal ions Cu(2+), Fe(3+), Ni(2+) and Mn(3+) were selected and evaluated in the present study because of the important role they play in a biological system. pUC19 plasmid DNA damage-induced by NaDip (80-600 μM) was observed in the presence of 100 μM Cu(2+)...
November 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/29157956/comparative-analysis-of-fixation-and-embedding-techniques-for-optimized-histological-preparation-of-zebrafish
#5
Jean E Copper, Lynn R Budgeon, Christina A Foutz, Damian B van Rossum, Daniel J Vanselow, Margaret J Hubley, Darin P Clark, David T Mandrell, Keith C Cheng
In recognition of the importance of zebrafish as a model organism for studying human disease, we have created a web-based reference atlas of zebrafish microanatomy for comparing histology and histopathology between model systems and with humans (http://bio-atlas.psu.edu). Fixation, decalcification, embedding, and sectioning were optimized to maximize section quality. A comparison of protocols involving six fixatives showed that 10% Neutral Buffered Formalin at 21°C for 24h yielded excellent results. Sectioning of juveniles and adults requires bone decalcification; EDTA at 0...
November 17, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29157887/spatial-patterns-of-heavy-metal-accumulation-in-sediments-and-macrophytes-of-bellandur-wetland-bangalore
#6
T V Ramachandra, P B Sudarshan, M K Mahesh, S Vinay
Heavy metals are one among the toxic chemicals and accumulation in sediments and plants has been posing serious health impacts. Wetlands aid as kidneys of the landscape and help in remediation through uptake of nutrients, heavy metals and other contaminants. The analyses of macrophytes and sediment samples help in evaluating pollution status in aquatic environment. In this study concentration of six heavy metals (Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb) and Zinc (Zn)) were assessed in sediment and dominant macrophyte samples collected from Bellandur Lake, largest Lake of Bangalore, India...
November 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29157472/nuclear-magnetic-resonance-characterization-of-traditional-homeopathically-manufactured-copper-cuprum-metallicum-and-plant-gelsemium-sempervirens-medicines-and-controls
#7
Michel Van Wassenhoven, Martine Goyens, Marc Henry, Etienne Capieaux, Philippe Devos
BACKGROUND: NMR proton relaxation is sensitive to the dynamics of the water molecule H2O, through the interaction of the spin of the proton ((1)H) with external magnetic and electromagnetic fields. METHODS: We measured dilution and potentization processes through measurements of (1)H spin-lattice T1 and spin-spin T2 relaxation times. In order to interpret the recorded fluctuations in T1- or T2-values, experimental data were linearized by investigating how the area under a fluctuating time = f(dilution) curve (dilution integral or DI) changes with dilution...
November 2017: Homeopathy: the Journal of the Faculty of Homeopathy
https://www.readbyqxmd.com/read/29155390/biosynthesised-silver-and-copper-nanoformulation-as-foliar-spray-to-control-bird-s-eye-spot-disease-in-tea-plantations
#8
Balasubramanian Mythili Gnanamangai, Ponnusamy Ponmurugan, Sengottaiyan Eashwari Jeeva, Kolandasamy Manjukarunambika, Vishwanathan Elango, Kolandaivel Hemalatha, Jyoti Prasad Kakati, Rajamanickam Mohanraj, Somasundaram Prathap
Tea leaves have economic importance in preparation of the popular beverage of the world "tea". Bird's eye spot disease of tea leaves creates significant revenue loss in tea trade of many tea plant cultivating countries. Management of this disease by silver (AgNps) and copper (CuNps) nanoparticles that are biosynthesised by efficient antagonists was studied. The biocontrol agents like Pseudomonas fluorescens, Trichoderma atroviride and Streptomyces sannanensis were evaluated for nanoparticle synthesis against Cercospora theae isolates namely KC10, MC24 and VC38...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29150517/multi-omics-reveal-the-lifestyle-of-the-acidophilic-mineral-oxidizing-model-species-leptospirillum-ferriphilum-t
#9
Stephan Christel, Malte Herold, Sören Bellenberg, Mohamed El Hajjami, Antoine Buetti-Dinh, Igor V Pivkin, Wolfgang Sand, Paul Wilmes, Ansgar Poetsch, Mark Dopson
Leptospirillum ferriphilum plays a major role in acidic, metal rich environments where it represents one of the most prevalent iron oxidizers. These milieus include acid rock and mine drainage as well as biomining operations. Despite its perceived importance, no complete genome sequence of this model species' type strain is available, limiting the possibilities to investigate the strategies and adaptations Leptospirillum ferriphilum(T) applies to survive and compete in its niche. This study presents a complete, circular genome of Leptospirillum ferriphilum(T) DSM 14647 obtained by PacBio SMRT long read sequencing for use as a high quality reference...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29135106/evidence-for-the-efficacy-of-disulfiram-and-copper-combination-in-glioblastoma-multiforme-a-propos-of-a-case
#10
Petros N Karamanakos, Dimitrios T Trafalis, Dionysios J Papachristou, Eleftheria S Panteli, Maria Papavasilopoulou, Andreas Karatzas, Dimitrios Kardamakis, Georgios Nasioulas, Marios Marselos
Glioblastoma multiforme (GBM) is the most common and aggressive malignancy of the central nervous system. Treatment usually involves a combination of surgical resection, chemotherapy, and radiotherapy, but ultimately this condition is incurable. Besides the dismal prognosis of GBM, financial factors have also presented challenges for advancing treatments. Taking into consideration the high cost of developing new anticancer drugs as well as the fact that GBM is a rare disease, thus further limiting financial incentive for drug development, it becomes obvious that there has been growing interest for repurposing candidates...
September 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29131598/speciation-of-cucl-and-cucl2-thiol-amine-solutions-and-characterization-of-resulting-films-implications-for-semiconductor-device-fabrication
#11
Priya Murria, Caleb K Miskin, Robert Boyne, Laurance T Cain, Ravikiran Yerabolu, Ruihong Zhang, Evan C Wegener, Jeffrey T Miller, Hilkka I Kenttämaa, Rakesh Agrawal
Thiol-amine mixtures are an attractive medium for the solution processing of semiconducting thin films because of their remarkable ability to dissolve a variety of metals, metal chalcogenides, metal salts, and chalcogens. However, very little is known about their dissolution chemistry. Electrospray ionization high-resolution tandem mass spectrometry and X-ray absorption spectroscopy were employed to identify the species formed upon dissolution of CuCl and CuCl2 in 1-propanethiol and n-butylamine. Copper was found to be present exclusively in the 1+ oxidation state for both solutions...
November 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29128372/six-week-retention-after-post-placental-copper-intrauterine-device-placement
#12
Alyssa Covelli Colwill, Courtney A Schreiber, Mary D Sammel, Sarita Sonalkar
OBJECTIVES: We sought to evaluate the six-week clinical outcomes (IUD retention, recognized expulsions, ability to visualize or palpate strings, and need for ultrasound evaluation) in women who received a TCu380A PPIUD after vaginal (VD) or Cesarean delivery (CD). STUDY DESIGN: We conducted a retrospective cohort study to examine the six-week retention of TCu380A IUDs placed within ten minutes of placental delivery in VD (n=137) and CD (n=73). We used Student's t-test and Wilcoxon rank sum tests for continuous data and Pearson Chi-squared test and Fisher's exact test for categorical data...
November 8, 2017: Contraception
https://www.readbyqxmd.com/read/29125169/substrate-free-copper-nanoclusters-exhibit-super-diamagnetism-and-surface-based-soft-ferromagnetism
#13
Yuvaraja Raju, Pattabiraman Krishnamurthi, P L Paulose, Periakaruppan T Manoharan
Pure metallic copper nanoparticles free of any substrate were synthesized by the thermo-chemical reduction of copper acetate using triethanolamine as a reducing-cum-protection agent. The structure and physical and magnetic properties of the Cu NPs were analysed physicochemically. Microscopic analysis reveals the formation of particles of size of 3-5 nm as seen by TEM but present as a large agglomeration as identified by SEM. A structure of Cu9 is predicted for the Cu NPs on the basis of investigations using XPS, MALDI, EPR, and magnetic measurements and supported by the prediction of DFT calculation from an earlier work...
November 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/29122662/remote-loading-of-liposomes-with-manganese-52-and-in-vivo-evaluation-of-the-stabilities-of-52-mn-dota-and-64-cu-dota-using-radiolabelled-liposomes-and-pet-imaging
#14
Andreas I Jensen, Gregory W Severin, Anders E Hansen, Frederikke P Fliedner, Rasmus Eliasen, Ladan Parhamifar, Andreas Kjær, Thomas L Andresen, Jonas R Henriksen
Liposomes are nanoparticles used in drug delivery that distribute over several days in humans and larger animals. Radiolabeling with long-lived positron emission tomography (PET) radionuclides, such as manganese-52 ((52)Mn, T½=5.6days), allow the imaging of this biodistribution. We report optimized protocols for radiolabeling liposomes with (52)Mn, through both remote-loading and surface labeling. For comparison, liposomes were also remote-loaded and surface labeled with copper-64 ((64)Cu, T½=12.7h) through conventional means...
November 6, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29122608/thioredoxin-albumin-fusion-protein-prevents-copper-enhanced-zinc-induced-neurotoxicity-via-its-antioxidative-activity
#15
Ken-Ichiro Tanaka, Mikako Shimoda, Victor T G Chuang, Kento Nishida, Masahiro Kawahara, Tatsuhiro Ishida, Masaki Otagiri, Toru Maruyama, Yu Ishima
Zinc (Zn) is a co-factor for a vast number of enzymes, and functions as a regulator for immune mechanism and protein synthesis. However, excessive Zn release induced in pathological situations such as stroke or transient global ischemia is toxic. Previously, we demonstrated that the interaction of Zn and copper (Cu) is involved in the pathogenesis of Alzheimer's disease and vascular dementia. Furthermore, oxidative stress has been shown to play a significant role in the pathogenesis of various metal ions induced neuronal death...
November 6, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29122590/physiological-serum-copper-concentrations-found-in-malignancies-cause-unfolding-induced-aggregation-of-human-serum-albumin-in-vitro
#16
Asim Rizvi, Mohd Furkan, Imrana Naseem
Malignancies are characterized by several drastic metabolic changes, one of which is a progressive rise in the levels of serum copper. This rise in serum copper is documented across all malignancies and across malignancies in several species. This study aims to explore in vitro the effect of increased copper levels on the structure of the blood protein human serum albumin. Exposure of human serum albumin to physiologically relevant copper concentrations for 21 days resulted in structural modifications in the protein which were evident by changes in the intrinsic florescence...
November 6, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29118743/salinity-based-toxicity-of-cuo-nanoparticles-cuo-bulk-and-cu-ion-to-vibrio-anguillarum
#17
Alice Rotini, Andrea Tornambè, Riccardo Cossi, Franco Iamunno, Giovanna Benvenuto, Maria T Berducci, Chiara Maggi, Maria C Thaller, Anna M Cicero, Loredana Manfra, Luciana Migliore
Bacteria are used in ecotoxicology for their important role in marine ecosystems and their quick, reproducible responses. Here we applied a recently proposed method to assess the ecotoxicity of nanomaterials on the ubiquitous marine bacterium Vibrio anguillarum, as representative of brackish and marine ecosystems. The test allows the determination of 6-h EC50 in a wide range of salinity, by assessing the reduction of bacteria actively replicating and forming colonies. The toxicity of copper oxide nanoparticles (CuO NPs) at different salinities (5-20-35 ‰) was evaluated...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29112419/coordination-chemistry-of-bifunctional-chemical-agents-designed-for-applications-in-64-cu-pet-imaging-for-alzheimer-s-disease
#18
Anuj K Sharma, Jason W Schultz, John T Prior, Nigam P Rath, Liviu M Mirica
Positron emission tomography (PET) is emerging as one of the most important diagnostic tools for brain imaging, yet the most commonly used radioisotopes in PET imaging, (11)C and (18)F, have short half-lives, and their usage is thus somewhat limited. By comparison, the (64)Cu radionuclide has a half-life of 12.7 h, which is ideal for administering and imaging purposes. In spite of appreciable research efforts, high-affinity copper chelators suitable for brain imaging applications are still lacking. Herein, we present the synthesis and characterization of a series of bifunctional compounds (BFCs) based on macrocyclic 1,4,7-triazacyclononane and 2,11-diaza[3...
November 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29104051/non-covalent-dna-binding-protein-interaction-dna-cleavage-and-cytotoxicity-of-cu-quamol-cl-%C3%A2-h2o
#19
Somasundaram Sangeetha, Mariappan Murali
A copper(II) complex [Cu(II)(quamol)Cl]·H2O, where H(quamol) is N-2-(quinolyl-methylidene)aminophenol, has been isolated. The solution structure of the complex has been assessed to be distorted square-planar. The complex displays a ligand field band in the visible region (608nm) and also show axial EPR spectrum in DMF at 77K with g||>g⊥ indicating a dx(2)-y(2) ground state. The g|| and A|| values of 2.265 and 153×10(-4)cm(-1), respectively, conform to a square-based CuN2OCl chromophore. The interaction of the complex with calf thymus (CT) DNA has been explored by using absorption (Kb=2...
November 2, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29102357/effect-of-temperature-on-copper-iron-and-lead-leaching-from-e-waste-using-citrate-solutions
#20
Robinson Torres, Brenda Segura-Bailón, Gretchen T Lapidus
E-waste is a potential source of large quantities of metals. The ability of citrate solutions to recover base metals from these materials has been demonstrated. In the present study, the effect of the temperature on base metal leaching capacity by the citrate solutions is determined. The material employed consisted of a mechanically prepared, gravity concentrated e-waste, with a metallic content greater than 90%. The leaching conditions were selected based on previous research performed by the authors (0.5 M sodium citrate, pH 4...
October 25, 2017: Waste Management
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