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Showing 1 to 20 of 25 for “"microcalorimetry"”.
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Rapid quantification of probiotic cultures using microcalorimetry
The potential of using microcalorimetry as a rapid method for the quantification of probiotic micro-organisms was investigated. The technique was based on two potential mechanisms: the metabolism of specific carbohydrate and the ability to metabolise glucose in the presence of inhibitors. In …
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Investigating process stresses on Saccharomyces cerevisiae using isothermal microcalorimetry
… and state. The recent technical advances in microcalorimetry suggest potential for the use of isothermal microcalorimetry (IMC) to determine yeast viability and vitality and is investigated here. IMC is a laboratory method whereby the real-time heat produced by a chemical, biological or …
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Adsorption and Reaction Microcalorimetry on Nickel and Platinum Single Crystal Surfaces
The unique Cambridge single crystal adsorption microcalorimeter has been applied to a range of systems of catalytic interest to extract fundamental thermodynamic data. Coverage-dependent adsorption heats and sticking probabilities have been obtained with CO, NO, oxygen and ethylene adsorbates and …
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Catalytic and adsorbent properties of solid acid catalysts studied by ammonia adsorption microcalorimetry
… catalysts has been studied by NH3 adsorption microcalorimetry. NH3 is assumed to adsorb stoichiometrically on surface acid sites and the molar enthalpy of ammonia adsorption is assumed to reflect the strength of the acid sites. The catalytic activities of the catalysts have been measured using …
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Thermodynamic modeling and microcalorimetry of nanostructured materials for capacitive thermal management of electronics
Transient power dissipation profiles in handheld electronic devices alternate between high and low power states depending on usage. Capacitive thermal management based on phase change materials potentially offers a fan-less thermal management for such transient profiles. However, such capacitive …
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Specificity and structural characterization of the PDZ domain from DegS, an extracytoplasmic E. coli protease
… peptide and OMP derivatives were confirmed using microcalorimetry. Because stress signaling can be triggered by over-expression of some of the outer-membrane proteins, I propose that DegS may receive a signal from unassembled OMPs and transmit it to the aE transcription factor by increasing …
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PMMA Clay Nanocomposites
… of the PCN were investigated using DSC, TGA and Microcalorimetry. From oscillatory shear rheology, the full master curves for the PCN were obtained by applying the time-temperature superposition (TTS) principle. To quantify the effect of the clay upon the rheology, the experimental data was …
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Determination of Surface Free Energies and Aspect Ratio of Talc
… such as talc. The same trend obtained using flow microcalorimetry was observed for the evolution of the aspect ratio as a function of particle fineness, i.e. the fracture prevails over delamination after achieving a maximum aspect ratio value of about 35. The agreement between two distinct methods …
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Síntesis y análisis conformacional de glicopéptidos que incorporan ß-glucosa y a-N-acetilgalactosamina
… by two specific lectins were obtained by microcalorimetry. All this work shows the importance of the amino acid linked to the carbohydrate plays in the molecular recognition process. In fact, it is not a mere spectator but it develops a role as modulator agent.
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The thermochemical behaviour of thiol collectors and collector mixtures with sulphide minerals
… understood. This study used isothermal titration microcalorimetry to monitor sub-monolayer reactions by continuously measuring the heats of adsorption as the reactions between thiol collector (and collector mixtures) and sulphide minerals (and mixed minerals) proceed in real time. The enthalpy of …
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Characterization of block copolymers and polymer blends by inverse gas chromatography
… the experimental heats of mixing determined from microcalorimetry measurements. For the remaining blends, the IGC data could not be distinguished from the results normally obtained for immiscible blends. The calculated G<sub>M</sub> values were small in magnitude relative to the experimental error …
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Fundamental studies of thionocarbamate interactions with sulfide minerals
… the use of Drago’s acid-base concept and flow microcalorimetry. The results of the thermodynamic calculations and electrochemical measurements suggest that IPETC and IBECTC adsorption on copper and chalcocite are dependent on potential. This has been verified by contact angle and in-situ …
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An investigation into the floatability of platinum group arsenides and tellurides under varying collector and solution chemistries
… on the sperrylite surface which was shown using microcalorimetry, none of the collectors significantly improved the floatability of sperrylite at pH 9 and a dosage equivalent to 1 pseudo-monolayer (ML) surface coverage. Higher dosages of a strong collector, potassium amyl xanthate (PAX), improved …
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Multifunctional reactive nanocomposite materials
… were characterized using DSC and isothermal microcalorimetry. The results were interpreted using a Cabrera-Mott reaction model. Simultaneous processing of both experimental data sets identified the parameters for the respective Cabrera-Mott kinetics. The low temperature kinetic model was …
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Characterization and Implications of Surface Hydrophobicity in Nanoparticle Fate and Transport
… adsorption to nanomaterial powders, or immersion microcalorimetry and thermogravimetric analysis, yielded similar results to the molecular probes. However, possible physical or chemical transformations to NP surfaces during characterization by these other methods limited the use of results to …
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Glycerol Oxidation with Zeolite and Hierarchical Zeolite as Catalysts and Electrocatalysts
… (XRD, N2 physisorption, ICP-OES, NH2 adsorption microcalorimetry) and tested in different conditions to evaluate the effect on catalytic performance of the different zeolite structures, the nature and amount of the metal ions, and the GLY/H2O2 molar ratio. The main mechanism involved in the …
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Bioreactor Janssand : fermentation processes in tidal-flat sediments of the German North Sea
Der anaerobe Abbau organischen Materials in Wattsedimenten umfasst mehrere Schritte. Der Fokus dieser Studie liegt auf den einleitenden Fermentationsprozessen. Im Rahmen dieser Arbeit wurde ein neuer experimenteller Ansatz entwickelt, bei dem Mikrokalorimetrie zur Ermittlung verschiedener …
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Kinetic modeling and automated optimization in microreactor systems
… to determine the limits of sensitivity of the microcalorimetry system. A continuous concentration ramp experiment is performed with online IR analysis, enabling the thermoelectric output to be adjusted for reaction rate to determine the sensitivity to the heat of reaction. Below approximately 2 …
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A methodology for the heat of immersion as a measure of wettability of mineral mixtures
… to these techniques. The advancement of microcalorimetry instrumentation has led to the use of heat of immersion to determine the surface wettability of solid surfaces. Several calorimetric studies have proven that the heat of immersion can be used to determine the surface wettability of …
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