5 research outputs found
Mimicking of glutathione peroxidase deficiency by exposition of JAR cells to increased level of synthetic hydroperoxide
A short chain synthetic analogue of lipid hydroperoxides was used to overload
glutathione peroxidase (GPx) in human choriocarcinoma cell line JAR cells. Cells
exposed to 100 µM tBuOOH displayed a 40% reduction in ATP level and significantly
increased in membrane permeability, visualised by the lactate dehydrogenase
(LDH) release into the extracellular medium. The intracellular level of
oxygen free radicals measured as an oxidation of the dichlorodihydro-fluorescein
diacetate (H2DCF-DA) significantly increased after 2 hours of cell exposition to
100 µM tBuOOH. Concomitantly MDA, 4-HNE level increased to 2 nmol/mg of
cell protein after 2 hours. Mitochondria stained with MitoTracker Red CMXRos
displayed a filamentous appearance in control cells but changed into granular
less energised organelles after exposition to tBuOOH. Collectively, the above
results indicate the importance of the contribution of oxidative stress in the
development of pre-eclampsia
On Perturbation Measure of Sets : Properties
In this paper we describe a new measure of remoteness
between sets described by nominal values. The introduced
measures of perturbation of one set by another
are considered instead of commonly used distance between
two sets. The operations of the set theory are operated
and the considered measures describe changes of
the perturbed second set by adding the first one or vice
versa. The values of the measure of sets’ perturbation
are range between 0 and 1, and in general, are not symmetric
– it means that the perturbation of one set by another
is not the same as the perturbation of the second
set by the first one
A hybrid approach to dimension reduction in classification
In this paper we introduce a hybrid approach to data series classification. The approach is based on the concept of aggregated upper and lower envelopes, and the principal components here called 'essential attributes', generated by multilayer neural networks. The essential attributes are represented by outputs of hidden layer neurons. Next, the real valued essential attributes are nominalized and symbolic data series representation is obtained. The symbolic representation is used to generate decision rules in the IF. . . THEN. . . form for data series classification. The approach reduces the dimension of data series. The efficiency of the approach was verified by considering numerical examples