1,720,996 research outputs found
Tamoxifen as an emerging endocrine disruptor: Effects on fish reproduction and detoxification target genes
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A glucose biosensor operating under non-isothermal conditions: The dynamic response
No full textThe results obtained with a glucose biosensor operating under non-isothermal conditions are presented and discussed. Glucose oxidase, immobilized onto Nylon membranes, was used as biological element. An amperometric two electrodes system was employed to measure the anodic current produced by oxidation of hydrogen peroxide. Non-isothermal conditions were characterized in terms of the temperature difference, ΔT = Tw-Tc, and of the average temperature of the system, Tav = (Tw+Tc)/ 2, Tw and Tc being the temperature in the warm and cold half-cells constituting the biosensor. Comparison between the functioning of the biosensor under isothermal and non-isothermal conditions was performed. It was found that, under non-isothermal conditions, the dynamic response and sensitivity increased, while the response times and the detection limit decreased, if comparison was done with the same parameters measured under isothermal conditions. The increase of the dynamic response was found to be proportional to the applied temperature gradient.The results obtained with a glucose biosensor operating under non-isothermal conditions are presented and discussed. Glucose oxidase, immobilized onto Nylon membranes, was used as biological element. An amperometric two electrodes system was employed to measure the anodic current produced by oxidation of hydrogen peroxide. Non-isothermal conditions were characterized in terms of the temperature difference, ΔT = Tw-Tc, and of the average temperature of the system, Tav = (Tw+Tc)/ 2, Tw and Tc being the temperature in the warm and cold half-cells constituting the biosensor. Comparison between the functioning of the biosensor under isothermal and non-isothermal conditions was performed. It was found that, under non-isothermal conditions, the dynamic response and sensitivity increased, while the response times and the detection limit decreased, if comparison was done with the same parameters measured under isothermal conditions. The increase of the dynamic response was found to be proportional to the applied temperature gradient
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Immobilized enzyme activity under isothermal and bnon-isothermal conditionS: Studies on beta-galactosidase as a model enzyme
No full textEfficieny increase of a bioreactor employing catalytic membranes under non-isothermal conditions
No full textGlucose determination by means of a new reactor/sensor system operating under non-isothermal conditions
No full textVisible micro-Raman spectroscopy for determining glucose content in beverage industry
No full textThe potential of Raman spectroscopy with excitation in the visible as a tool for quantitative determination
of single components in food industry products was investigated by focusing the attention on glucose
content in commercial sport drinks. At this aim, micro-Raman spectra in the 600–1600 cm1
wavenumber shift region of four sport drinks were recorded, showing well defined and separated vibrational
fingerprints of the various contained sugars (glucose, fructose and sucrose). By profiting of the
spectral separation of some peculiar peaks, glucose content was quantified by using a multivariate statistical
analysis based on the interval Partial Least Square (iPLS) approach. The iPLS model needed for data
analysis procedure was built by using glucose aqueous solutions at known sugar concentrations as calibration
data. This model was then applied to sport drink spectra and gave predicted glucose concentrations
in good agreement with the values obtained by using a biochemical assay. These results represent a
significant step towards the development of a fast and simple method for the on-line glucose quantification
in products of food and beverage industry
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