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Selenium Compounds (2):
Recent article
Selenium Compounds
Abstract
We focus on the development of new structures that contain selenium and/or sulfur and discuss our understanding of the regulation of antitumoral effects with emphasis on kinase modulation activity and its implications in cancer....
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PMID: 21395545
PDF is available here.
PDF is available here.
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Abstract
This chapter discusses the photosystem II (PSII) reconstitution into proteoliposomes. In the first part of the chapter, protocols are outlined for the preparation of lipid bilayer vesicles (liposomes) constituted of individual thylakoid lipids or their mixtures, for the preparation of PSII particles...
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PMID: 20960133
PDF is available here.
PDF is available here.
British Journal of Nutrition (104)11 2010
Abstract
I deiodinase (D1) mRNA levels in chicken hepatocytes were evaluated. Primary cultured chicken hepatocyte monolayers derived from male White Leghorn chickens (aged 30-40 d) were incubated for 24 h with 0 (control), 0.5, 1, 1.5, 2, 3, 4 or 5 μmol/l of Se supplied as dl-selenomethionine (Se-Met), κ-s...
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PMID: 20624339
PDF is available here.
PDF is available here.
Chemical Communications (46)38 2010
Abstract
Cyclic RGD-peptide functionalized phospholipids micelle-encapsulated near-infrared CdTe/ZnSe quantum dots were synthesized as multifunctional probes for targeting and imaging tumors in live animals.
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PMID: 20820500
PDF is available here.
PDF is available here.
Abstract
Blinking of zinc blende CdSe-based core/shell nanocrystals is studied as a function of shell materials and surface ligands. CdSe/ZnS, CdSe/ZnSe/ZnS and CdSe/CdS/ZnS core/shell nanocrystals are prepared by colloidal synthesis and six monolayers of larger bandgap shell materials are grown over the CdS...
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PMID: 20607188
PDF is available here.
PDF is available here.
Abstract
We have recently shown significant preventive benefit of methylseleninic acid (MSeA) and Se-methylselenocysteine (MSeC) in the transgenic adenocarcinoma mouse prostate (TRAMP) model by oral administration. The present work applied iTRAQ proteomic approach to profile protein changes of the TRAMP pros...
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PMID: 20647336
PDF is available here.
PDF is available here.
Nanotechnology (21)29 2010
Abstract
We attribute to the size-selective sieving effect of CNTs. By controlling the terminating point for the flow of QDs across the CNT array, a QD size specific CNT/QD hybrid structure is achieved....
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PMID: 20585170
PDF is available here.
PDF is available here.
Journal of Fluorescence (20)4 2010
Abstract
In this paper, ZnSe nanoparticles, which were modified with mercaptoacetic acid (MAA), worked as novel fluorescence sensors for the quantitative determination of copper(II) and nickel(II). Under the optimal conditions, the fluorescence intensities of functionalized ZnSe nanoparticles were quenched b...
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PMID: 20213241
PDF is available here.
PDF is available here.
Advanced Materials (FRG) (22)25 2010
Abstract
Nanotechnology (21)25 2010
Abstract
We generate highly monodisperse ZnS and CdZnS shells on CdSe semiconductor nanocrystals at temperatures as low as 65 degrees C by enhancing the precursor solubility. Relatively small amounts of trioctylphosphine and trioctylphosphine oxide have marked effects on the solubility of the metal salts use...
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PMID: 20516578
PDF is available here.
PDF is available here.
Abstract
We used cadmium sulfate hydrate (CdSO(4).8/3H(2)O), elemental S and Se. Aqueous solutions of NaOH, Na(2)SO(3) and EDTA were used as the solvents. During the syntheses, we used a direct immersion ultrasound probe by vibracell. The device operates with a constant frequency of 20 kHz, with the possibil...
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PMID: 20045661
PDF is available here.
PDF is available here.
Abstract
We therefore soaked selenate into two different types of RNA crystals and used the anomalous signal from these anions to identify binding sites in these RNA molecules unambiguously. Examination of these sites and comparison with other suspected anion binding sites reveals features of anion binding m...
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PMID: 20410239
PDF is available here.
PDF is available here.
Abstract
A variety of N-alkyl-beta-aminodiselenides have been synthesized in high yield from sulfamidates under mild reaction conditions using potassium selenocyanate and benzyltriethylammonium tetrathiomolybdate ([BnNEt(3)](2)MoS(4)) in a sequential, one-pot, multistep reaction. The tolerance of multifariou...
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PMID: 20392054
PDF is available here.
PDF is available here.
Abstract
Galvanostatic stripping chronopotentiometry (GSC) was developed and applied for the determination of selenium in human plasma. In this work GSC based on composite carbon electrode coated by a gold layer was optimized concerning various electrochemical parameters (coating procedure, electrolysis pote...
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PMID: 20503922
PDF is available here.
PDF is available here.
Nanotechnology (21)17 2010
Abstract
The flow behavior of nanostructure clusters, consisting of chemically bonded PbSe quantum dots and magnetic gamma-Fe(2)O(3) nanoparticles, has been investigated. The clusters are regarded as model nanoplatforms with multiple functionalities, where the gamma-Fe(2)O(3) magnets serve as transport vehic...
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PMID: 20368678
PDF is available here.
PDF is available here.
Abstract
High quality water-soluble semiconductor CdSe quantum dots (QDs) were prepared by a phase transfer method, in which amphiphilic oligomers (polymaleic acid aliphatic alcohol ester) was used as surface coating agents. The as-prepared aqueous QDs were high fluorescent and extremely stable. Fourier tran...
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PMID: 20129617
PDF is available here.
PDF is available here.
Chemical Communications (46)14 2010
Abstract
A quantum dot-based ratiometric pH sensor that responds to the pH range 6-8 was developed using FITC (fluorescein isothiocyanate) conjugated CdSe/CdZnS nanocrystals.
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PMID: 20309464
PDF is available here.
PDF is available here.
Abstract
Abstract
We investigate multiexciton dissociation dynamics in CdSe QDs adsorbed with methylene blue (MB(+)) molecules by transient absorption spectroscopy. We show that excitons in QDs dissociate by ultrafast electron transfer to MB(+) with an average time constant of approximately 2 ps. The charge separated...
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PMID: 20218563
PDF is available here.
PDF is available here.
Abstract
We found the following: (1) both direct incubation and extracts of nanoparticles are required for complete assessment of nanoparticle cytotoxicity, (2) the rare earth oxide nanoparticles are less cytotoxic than the Cd-based quantum dots, and (3) the extent of cytotoxicity is dependent upon the cell...
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PMID: 19569209
PDF is available here.
PDF is available here.
Optics Letters (35)7 2010
Abstract
To realize an electrically pumped compact mid-IR microlaser, the optical properties of a Cr(2+):ZnSe film deposited by rf magnetron cosputtering were compared with those of a single crystal. The mid-IR room temperature photoluminescence efficiency of the film appears only twice less than the one of...
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PMID: 20364191
PDF is available here.
PDF is available here.
Clinical Pediatrics (49)3 2010
Abstract
To describe (a) the predictive value of symptoms for diagnosis of tinea capitis and (b) the rate and timing of cure with high-dose griseofulvin treatment.
This prospective open-label study enrolled children aged 1 to 12 years with clinical tinea capitis. Participants...
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PMID: 19487765
PDF is available here.
PDF is available here.
Chemical Communications (46)8 2010
Abstract
The highly enhanced electrochemiluminescence from a novel hybrid gold/silica/CdSe-CdS quantum-dot nanostructure has been reported for the first time, and successfully applied to develop an ultrasensitive ECL immunosensor for the detection of a protein tumor marker, carcinoembryonic antigen.
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PMID: 20449291
PDF is available here.
PDF is available here.
Protective effects of antioxidant combination against D-galactosamine-induced kidney injury in rats.
Abstract
The protective effects of an antioxidant combination in kidney injury induced by the injection of D-galactosamine (D-GaIN) were examined in the present study. Sprague Dawley female rats were used and divided into four groups as follows: (1) animals injected physiological saline solut...
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PMID: 20087876
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Ligand capping effect for dye solar cells with a CdSe quantum dot sensitized ZnO nanorod photoanode.
Abstract
We report a quantum dot sensitized solar cell (QDSSC) with a thioglycolic acid (TGA) capped CdSe quantum dot (QD) sensitized ZnO nanorod photoanode. As revealed by UV-Vis absorption spectrum and transmission electron microscopy, the quantum dots can be effectively adsorbed onto ZnO nanorods. By stud...
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PMID: 20173955
PDF is available here.
PDF is available here.
Abstract
We found novel polynuclear selenium-containing compounds, i.e. polyselenodipenicillamines (PenSSe(2-4)SPen), in the reaction of D-penicillamine (PenSH) with H(2)SeO(3). The selenium-centered features of PenSSe(2-4)SPen were determined by (1)H-NMR and LC-MS/MS analyses, showing that the selenium isot...
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PMID: 20606346
PDF is available here.
PDF is available here.
Abstract
Optics Express (17)24 2009
Abstract
CdSe/ZnS core-shell quantum dots have been embedded within microstructured polymer optical fibres. The emission properties of quantum dots within fibres have been explored to show that variation in concentration, sample length and pumping regimes effects the emission characteristics of these quantum...
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PMID: 19997374
PDF is available here.
PDF is available here.
Abstract
We present the first comprehensive report on CdSe/CdS heterostructure nanocrystals. The effects of core size and shell thickness on the optical properties of CdSe/CdS heterostructure nanocrystals are investigated. We report a reliable synthetic method to grow thick CdS shells on CdSe cores with size...
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PMID: 19754114
PDF is available here.
PDF is available here.
Abstract
Selenium offers important health benefits, including the prevention of some types of cancer. The traditional selenium indexes, such as selenium concentration, do not account for the metabolic status of this element regarding its chemoprotective effect. Then, the knowledge of a group of proteins that...
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PMID: 19835700
PDF is available here.
PDF is available here.
Optics Express (17)20 2009
Abstract
A new flexible pump source, the optically-pumped semiconductor disk laser (SDL), for the Cr(2+):ZnSe laser is reported. The SDL provides up to 6W output power at a free running central wavelength of 1.98 microm. The Cr(2+):ZnSe laser operated at an output power of 1.8W and a slope efficiency of appr...
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PMID: 19907603
PDF is available here.
PDF is available here.
Inorganic Chemistry (48)18 2009
Abstract
We discovered that we could adjust the Zn(0.93)Cd(0.07)Se QD intensity ratio of the band-edge (431 nm) to trap-state (499 nm) emissions by controlling the reaction time. Careful control of the reaction time allowed us to balance the relative strength of the band-edge and trap-state emissions, thereb...
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PMID: 19685916
PDF is available here.
PDF is available here.
Abstract
Selenium (Se) is an essential trace element unevenly distributed on the Earth’s crust with low selenium regions predominating. To prevent selenium-deficiency diseases in livestock, additions of selenium to animal feed are required and were approved for all species, but the chemical form of the elem...
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PMID: 19514898
PDF is available here.
PDF is available here.
Abstract
A versatile combinatorial approach was developed for the rapid synthesis of 2-pyridones, 1,4-diazepines, and 1,4-oxazepines libraries. The synthetic strategy includes electrophilic addition, nucleophilic substitution, amine-acid condensation, Dieckmann condensation, lactamization, ester hydrolysis,...
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PMID: 19691355
PDF is available here.
PDF is available here.
Photoelectrochemical performance of CdSe nanorod arrays grown on a transparent conducting substrate.
Abstract
Perpendicularly aligned semiconducting CdSe nanorod arrays were fabricated on ITO-coated glass substrate using porous aluminum oxide (PAO) as a hard template. Nanorod lengths were varied between 50 and 500 nm, while keeping the diameter at 65 nm. The electrochemical photovoltaic performance was foun...
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PMID: 19705806
PDF is available here.
PDF is available here.
Applied Spectroscopy (63)9 2009
Abstract
The growth of Pseudomonas aeruginosa PAO1 biofilms on ZnSe internal reflection elements (IREs) was compared with their growth on TiO(2)-coated ZnSe over several days using attenuated total reflection Fourier transform infrared (ATR-FT-IR) spectroscopy. The effect of the TiO(2) coating on the IR spec...
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PMID: 19796481
PDF is available here.
PDF is available here.
Abstract
The review is devoted to the role of selenium and its compounds for living organisms. Selenium as an antioxidant protects the cells from generating free radicals. It constitutes an integral part of approximately 20 enzymes. Glutathione peroxidase, which participates in metabolism of H2O2 and plays a...
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PMID: 19827742
PDF is available here.
PDF is available here.
Abstract
We report on the observation of an intermediate state in the blinking of single CdSe/CdS core-shell nanocrystals. This state has a low quantum yield and connects the "on" and "off" states commonly observed in the photoluminescence blinking of individual nanocrystals. We find that the transitions bet...
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PMID: 19655720
PDF is available here.
PDF is available here.
Abstract
We have cast SCCNT-CdSe composite films on optically transparent electrodes (OTEs). The quenching of CdSe emission, as well as transient absorption measurements, confirms ultrafast electron transfer to SCCNTs. The rate constant for electron transfer increases from 9.51 x 10(9) s(-1) to 7.04 x 10(10)...
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PMID: 19603793
PDF is available here.
PDF is available here.
Abstract
For up to 1 billion people worldwide, insufficient dietary intake of selenium (Se) is a serious health constraint. Cereals are the dominant Se source for those on low protein diets, as typified by the global malnourished population. With crop Se content constrained largely by underlying geology, reg...
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PMID: 19731713
PDF is available here.
PDF is available here.
The Journal of Chemical Physics (130)23 2009
Abstract
We introduce a first principles fictitious mass scheme to weigh each individual density element differently and instantaneously. As an alternative to diagonalization in SCF, the Car-Parrinello scheme is implemented as a density matrix search method. Not only does the fictitious mass scheme developed...
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PMID: 19548719
PDF is available here.
PDF is available here.
Nanotechnology (20)21 2009
Abstract
We investigated the chemical fate of QD705 in the kidneys of mice. We used the molar ratio of Cd and Te (increased Cd/Te ratio signifies increased Cd release from QD705) and the induction of tissue metallothionein (MT) as markers for elevated free Cd in tissues. Our study indicated that 100% of QD70...
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PMID: 19423922
PDF is available here.
PDF is available here.
Nanotechnology (20)21 2009
Abstract
A highly aligned one-dimensional (1D) nanostructure was realized at the surface of Fe/ZnSe bilayers grown on GaAs(001) substrates through thermal annealing. These 1D nano-grooves were found to align along the [110] direction resulting in bent reflection high energy electron diffraction (RHEED) patte...
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PMID: 19423938
PDF is available here.
PDF is available here.
Abstract
We report a synthesis of anisotropic colloidal superparticles (SPs) from CdSe/CdS semiconductor nanorods. These anisotropic SPs are cylindrical disks or stacked-disk arrays. We attribute the major driving forces controlling the SP shape to interparticle interactions between nanorods and solvophobic...
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PMID: 19361158
PDF is available here.
PDF is available here.
Abstract
We first observed that adenosine deaminase activity was higher in young rat brains when compared to the 60-day-old rats and was higher in hippocampus when compared to the cortex. Methylmercury (0.1, 1.0, 20 microM) inhibited adenosine deaminase activity in 7- and 60-day-old rats in a concentration-d...
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PMID: 19413661
PDF is available here.
PDF is available here.
Abstract
Whole-cell immobilization of selenate-respiring Sulfurospirillum barnesii in polyacrylamide gels was investigated to allow the treatment of selenate contaminated (790 microg Se x L(-1)) synthetic wastewater with a high molar excess of nitrate (1,500 times) and sulfate (200 times). Gel-immobilized S....
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PMID: 19305993
PDF is available here.
PDF is available here.
Abstract
Taken together, our data suggest that the anti-inflammatory properties of DSE-B are due to reduction in the expression of iNOS, COX-2, TNF-alpha, IL-1beta and IL-6 through the down-regulation of NF-kappaB binding activity....
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PMID: 19298695
PDF is available here.
PDF is available here.
Cancer Research (69)7 2009
Abstract
Our rationale for selenium intervention is based on current mechanistic knowledge derived solely from preclinical investigations. Clearly, there is sufficient scientific support for its entry into current clinical trials, the outcome of which will be highly valuable in assessing whether selenium can...
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PMID: 19318549
PDF is available here.
PDF is available here.
Nanotechnology (20)13 2009
Abstract
We present an investigation of the photoluminescence of CdSe/ZnS quantum dots at high light intensity and in low magnetic fields. Upon increasing the magnetic field up to 90 G, the photoluminescence intensity drops. When decreasing the magnetic field back to zero the photoluminescence drop remains p...
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PMID: 19420489
PDF is available here.
PDF is available here.
The Journal of Chemical Physics (130)12 2009
Abstract
We present a computational study of pressure-induced structural phase transitions in bulk CdSe. Thanks to the use of the metadynamics technique we were able to observe the phase transitions at room temperature close to the experimental transition pressure. We discuss the transition mechanisms from f...
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PMID: 19334877
PDF is available here.
PDF is available here.
Abstract
Apoferritin-coated photoluminescent CdSe nanoparticles generated by an EDTA-mediated in situ method are photostable, water soluble and biocompatible.
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PMID: 19240903
PDF is available here.
PDF is available here.
Abstract
We report the synthesis, the structural and optical characterization of CdSe/CdS/ZnS "double shell" nanorods and their exploitation in cell labeling experiments. To synthesize such nanorods, first "dot-in-a-rod" CdSe(dot)/CdS(rod) core/shell nanocrystals were prepared. Then a ZnS shell was grown epi...
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PMID: 19206236
PDF is available here.
PDF is available here.
Abstract
Our results showed that CdSe QDs prepared in water phase were highly luminescent, stable, and successfully conjugated with E. coli and S. aureus. The fluorescence method could detect 10(2)-10(7)CFU/mL total count of E. coli and S. aureus in 1-2h and the low detection limit is 10(2)CFU/mL. A linear r...
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PMID: 19159803
PDF is available here.
PDF is available here.
Veterinary Record (164)9 2009
Abstract
Six weeks before mating, the ewes on six hill farms were randomly assigned to receive either a subcutaneous injection of a long-acting supplement containing 50 mg/ml selenium as barium selenate, or no injected selenium. Before the treatment, the mean activity of glutathione peroxidase (GSHPx) in the...
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PMID: 19252213
PDF is available here.
PDF is available here.
Abstract
Aquatic organisms are considered excellent biomarkers of mercury (Hg) occurrence in the environment. Selenium (Se) acts in antagonism to this metal, stimulating its elimination, and reducing its toxicity. In this paper, tilapia (Oreochromis niloticus) were chronically acclimated in sub-lethal Hg(2+)...
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PMID: 19034371
PDF is available here.
PDF is available here.
Abstract
The aim of this study was to examine whether an antioxidant combination of vitamin C, vitamin E, and sodium selenate (Se) has an effect on the liver of diabetic rats. Vitamin C, vitamin E, and Se were administered for 30 days to streptozotocin (STZ)-induced diabetic and control groups. In the STZ di...
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PMID: 18712602
PDF is available here.
PDF is available here.
Abstract
The fluorescence resonance energy transfer (FRET) between CdSe-ZnS QDs and fluorophore-labeled galactose or fluorophore-labeled dopamine linked to phenyl boronic acid-functionalized QDs is used to develop competitive assays for the optical detection of galactose, glucose, or dopamine.
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PMID: 19322434
PDF is available here.
PDF is available here.
Abstract
The fluorescence emission of CdSe/ZnS QDs was switched "off" when the native trioctylphosphine oxide ligands were exchanged for 1-(bis(eta(5)-cyclopentadienyl)iron)-methyl-3-(5,7-dimercapto-heptyl)-urea (); importantly, the emission of the resulting conjugate was switched "on" upon addition of fluor...
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PMID: 19322422
PDF is available here.
PDF is available here.
Abstract
Lighting-up time: A cation-exchange reaction releases thousands of divalent cations from nonfluorescent CdSe ionic crystals and triggers fluorescence from thousands of originally nonfluorescent Fluo-4 fluorophores to obtain a large fluorescence amplification (see picture) and a low detection limit i...
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PMID: 19165850
PDF is available here.
PDF is available here.
Abstract
We investigated the influence of different sources of iodine, as KI, KIO(3) and periodate (KIO(4)), on its uptake in and growth of the model yeast Saccharomyces cerevisiae. KIO(3) inhibited the growth of the yeast the most and already at a 400 microM initial concentration in the growth medium; the O...
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PMID: 19133070
PDF is available here.
PDF is available here.