102,168 research outputs found
Multiple downstream promoter modules regulate the transcription of theDrosophila melanogaster I, Doc and F elements
No full textIdentification of sequences which regulate the expression of Drosophila melanogaster Doc LINE elements
No full textFunctional dissection of two promoters that control sense and antisense transcription of Drosophila melanogaster F elements
No full textIdentification of sequences which regulate the expression of Drosophila melanogaster Doc LINE elements
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Multiple downstream promoter modules regulate the transcription of theDrosophila melanogaster I, Doc and F elements
No full textFunctional dissection of two promoters that control sense and antisense transcription of Drosophila melanogaster F elements
No full textA Non-Enzymatic Carbohydrate Sensor Based on Multiwalled Carbon Nanotubes Modified with Adsorbed Active Gold Particles
No full textThe voltammetric behavior of a glassy carbon
electrode modified with multiwalled carbon nanotubes
(MWCNTs) and Au particles was studied in alkaline
medium towards the electrooxidation of some carbohydrates
used as model compounds. The influence of carbohydrate
concentration and scan rate on peak potentials,
peak currents, etc., observed at the modified electrode
was evaluated and critically discussed. The Au particles
dispersed into multiwalled carbon nanotubes structures
showed favorable electrocatalytic and analytical properties
towards the electrooxidation of xylose and glucose
molecules. Atomic force microscopy performed on the resulting
modified electrode showed a well-efficient 3D distribution
of Au active particles having sharp-edged and
elongated grains along bundles of the MWCNTs. The
three-dimensional MWCNT-Au composite structure of
the catalyst act as a promoter to enhance the diffusive
character of recorded currents and probably also increases
the rate of the heterogeneous electron transfer of the
electrooxidation process considered
Electrocatalytic oxidation of some hydrazine compounds at glassy carbon electrode modified with Co-gluconate complex.
No full textCobalt oxyhydroxide modified glassy carbon electrodes (GC/Co) prepared by anodic electrodepostion in alkaline solution containing gluconate ions as ligand species have been characterized and proposed as sensing probes for the detection of hydrazine compounds. Under cyclic voltammetry and chronoamperometric conditions, the electrooxidation processes of hydrazines on the GC/Co are severely attenuated indicating strong and irreversible adsorption of the analyte on the electrode surface with subsequent formation of stable films with fouling effects on the catalytic sites. On the contrary, under flowing conditions the hydrazine compounds show well-defined and reproducible peaks with good analytical performance. Flow injection analysis (FIA) carried out at constant applied potential of 0.3 V vs. Ag/AgCl (4 M?KCl) and using a flowing stream of 0.1 M NaOH solution containing 50 mu M Co2L22- as on-line modifier, shows limits of detection (LODs) comprised between 0.5 mu M for hydrazine and 2 mu M for 1,2-dimethyhydrazine. Regression analysis, shows linear ranges spanning over about three orders of magnitude above the detection limits with coefficients of correlation better than 0.96
Electrocatalytic Oxidation and Flow Detection Analysis of Semicarbazide at Based IrOx Chemically Modified Electrodes.
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