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Jaeken L.,Karel de Grote-University College | Matveev V.V.,Russian Academy of Sciences
Open Biochemistry Journal | Year: 2012

Observations of coherent cellular behavior cannot be integrated into widely accepted membrane (pump) theory (MT) and its steady state energetics because of the thermal noise of assumed ordinary cell water and freely soluble cyto-plasmic K+. However, Ling disproved MT and proposed an alternative based on coherence, showing that rest (R) and action (A) are two different phases of protoplasm with different energy levels. The R-state is a coherent metastable low-entropy state as water and K+ are bound to unfolded proteins. The A-state is the higher-entropy state because water and K+ are free. The R-to-A phase transition is regarded as a mechanism to release energy for biological work, replacing the classical concept of high-energy bonds. Subsequent inactivation during the endergonic A-to-R phase transition needs an input of metabolic energy to restore the low entropy R-state. Matveev's native aggregation hypothesis allows to integrate the energetic details of globular proteins into this view. © Jaeken and Matveev. Source

Smits M.,University of Antwerp | Huygh D.,Karel de Grote-University College | Craeye B.,University of Antwerp | Lenaerts S.,University of Antwerp
Catalysis Today | Year: 2014

Soot deposition has the negative ability to devalue the aesthetic appearance of buildings. Titanium dioxide applied on the building material is one way to counteract this problem as it provides air-purifying and self-cleaning properties due to its photocatalytic activity. In literature, photocatalytic soot oxidation was described, but until now, little information was available about the influence of process parameters on the photocatalytic degradation efficiency. The influence of three process parameters was tested in this study, namely TiO2 concentration, soot concentration and water-to-cement ratio (W/C-ratio) of the mortar substrates. The results revealed 50 μg TiO2 cm-2 is better to use on the cementitious materials than 250 μg TiO2 cm-2. The soot concentrations occurring in real-world situations will not inhibit the photocatalyst to be activated by light. Furthermore, the photonic efficiency increases slightly for lower W/C-ratios. This can be of interest for structural building applications, since a lower W/C-ratio results in a lower porosity of the samples and consequently in an increase in mortar strength. © 2013 Elsevier B.V. Source

Hoorens V.,Catholic University of Leuven | Takano K.,Catholic University of Leuven | Franck E.,University of Antwerp | Franck E.,Karel de Grote-University College | And 2 more authors.
Psychological Assessment | Year: 2015

We tested the usefulness of name-letter preference scores as indirect indicators of self-esteem by exploring whether multiple unsupervised self-administrations of letter rating tasks within a short period of time yield useful data. We also examined whether preferences for initials and noninitial name-letters tap different aspects of self-esteem. Participants from a community sample (N = 164; 58 men and 106 women, 17-67 years, Mage = 34.57, SD = 13.28) completed daily letter rating tasks and state self-esteem questionnaires for 7 consecutive days. They also completed a trait self-esteem questionnaire on the first measurement day as well as 6 months later. Preference scores for first-name initials were stronger but more unstable than preference scores for other name-letters. Preferences for first-name initials were primarily associated with directly measured state self-esteem whereas preferences for noninitials were primarily associated with directly measured trait self-esteem even if the latter was measured 6 months later. Thus, we showed that preferences for initials and noninitials are not simply interchangeable. Previous letter rating studies, which almost exclusively used initial preferences, should be interpreted in terms of state rather than trait self-esteem. In future studies, researchers should focus on the name-letter preference that reflects the aspect of self-esteem they wish to address. © 2015 American Psychological Association. Source

Penne R.,Karel de Grote-University College
European Journal of Combinatorics | Year: 2010

This paper characterizes the dead-center positions of a planar mechanism in terms of implicit bars, that can be described in their turn in terms of relative motion centers. Consequently, a graphical procedure for finding motion centers leads to a geometric description for dead-point positions. We give a survey of existing geometric constructions for motion centers, and we illustrate a new technique that makes use of the "Baracs construction". © 2010 Elsevier Ltd. Source

Tylleman B.,Free University of Colombia | Velde C.M.L.V.,Free University of Colombia | Velde C.M.L.V.,Karel de Grote-University College | Balandier J.-Y.,Free University of Colombia | And 4 more authors.
Organic Letters | Year: 2011

The regiospecific total synthesis and characterization of anti-isomers of 2,8-dialkylanthradithiophenes are described. The "anti" structure of the ADT derivatives is demonstrated by 13C NMR as well as single crystal X-ray diffraction. © 2011 American Chemical Society. Source

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