Ilona Bednarek

The role of nonlinear vector meson interactions in hyperon stars

An extended nonlinear model has been applied to construct a neutron star matter equation of state. In the case of neutron star matter with non-zero strangeness the extension of the vector meson sector by the inclusion of nonlinear mixed terms results in the stiffening of the equation of state and accordingly in the higher value of the maximum neutron star mass.

Properties of a protoneutron star in effective field theory

The complete form of the equation of state of strangeness rich protoneutron and neutron star matter has been obtained. The currently obtained lower value of the U{sub {lambda}}{sup ({lambda})} potential at the level of 5 MeV permits the existence of additional parameter set which reproduces the weaker {lambda}{lambda} interaction. The effects of the strength of hyperon-hyperon interactions on the equations of state constructed for the chosen parameter set have been analyzed. It has been shown that replacing the strong Y-Y interaction model by the weak one introduces large differences in the composition of a protoneutron star matter both in the strange and nonstrange sectors. Also concentrations of neutrinos have been significantly altered in protoneutron star interiors. The performed calculations have indicated that the change of the hyperon-hyperon coupling constants affects the value of the proto-neutron star maximum mass.

The influence of the strength of hyperon–hyperon interactions on neutron star properties

An equation of state of neutron star matter with strange baryons has been obtained. The effects of the strength of hyperon–hyperon interactions on the equations of state constructed for the chosen parameter sets have been analysed. Numerous neutron star models show that the appearance of hyperons is connected with the increasing density in neutron star interiors. The performed calculations have indicated that a change of the hyperon–hyperon coupling constants affects the chemical composition of a neutron star. The obtained numerical hyperon star models exclude a large population of strange baryons in the star interior.

Extended relativistic hyperon star model

In this paper an equation of state of neutron star matter, which includes strange baryons in the framework of Zimanyi and Moszkowski model has been obtained. We focus on the effects of the isospin dependence of the equation of state and construct the hyperon star model for the fitted parameters. Numerous neutron star models show that the appearance of hyperons is connected with the increasing density in neutron star interiors. Analysis carried out in this paper shows that the inclusion of

Theoretical model of a magnetic white dwarf

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The Influence of the Enhanced Vector Meson Sector on the Properties of the Matter of Neutron Stars

meson and additional nonlinear meson interaction terms affects the density dependence of the symmetry energy and the chemical composition of a neutron star. Since the effective baryon masses contribute to baryon chemical potentials, they also alter the chemical composition of the star. The obtained model of the star not only excludes large population of hyperons but also does not significantly reduce the lepton content in the star interior.

Neutron star matter in a relativistic mean-field theory

In this paper a theoretical model of a magnetic white dwarf is studied. All numerical calculations are performed under the assumption of a spherically symmetric star. The obtained equation of state is stiffer with the increase of value of the magnetic field (B). Numerical values of the maximum mass and radius are presented. The influence of the magnetic field on the results is evident. Finally the departure from the condition of isothermality of a degenerate electron gas in the gravitational field is discussed.

Silencing expression of the NANOG gene and changes in migration and metastasis of urinary bladder cancer cells.

This paper gives an overview of the model of a neutron star with non-zero strangeness constructed within the framework of the nonlinear realization of the chiral symmetry. The emphasis is put on the physical properties of the matter of a neutron star as well as on its internal structure. The obtained solution is particularly aimed at the problem of the construction of a theoretical model of a neutron star matter with hyperons that will give high value of the maximum mass.

MMP-9 directed shRNAs as relevant inhibitors of matrix metalloproteinase 9 activity and signaling.

The nucleon effective mass, binding energy, and neutron star configuration in the relativistic mean-field (RMF) theory are considered. The calculations are motivated by the construction of the equation of state for a neutron star in the RMF theory. The equations of state for different parameter sets are calculated using the Feynman-Bogoliubov variational method for temperature different from zero. Various equations of state enable the construction of neutron star models.

Nucleon and meson effective masses in the relativistic mean field theory

Introduction It has been proved that expression of the NANOG gene is observed not only in embryonic-derived malignancies, but also in breast cancer, ovarian cancer, cervix cancer and bladder cancer. NANOG overexpression is correlated with high activity of MMP-2 and MMP-9. The aim of the study was to evaluate the changes in the malignant phenotype of T24 bladder cancer cells with modulated expression of the NANOG gene. Material and methods Human urinary bladder cancer cells T24 (HTB-4) were cultivated under standard conditions. Transfection of the cells with silencing constructions was performed with the application of Lipofectamine 2000 (Invitrogen) reagent. Evaluation of changes in the expression level of individual genes was performed using qRTPCR. Changes in the protein level were evaluated using the Human ELISA Kit (Abcam). The invasion capability of transfected cells was tested using Matrigel Invasion Chambers (BD Biosciences). The changes in cell migration were assessed with a wound-healing assay. Results The qRTPCR evaluation showed that silencing the NANOG gene in T24 cells led to the decrease of mRNA for the MMP-2 gene to the level of 62.4% and the MMP-9 gene to the level of 76%. The cells with modulated expression of the NANOG gene migrated slower in the Matrigel invasion assay and in the wound-healing assay. The immunoenzymatic test showed a decrease in the protein level of MMP-9. Conclusions The transcriptional activity of the NANOG gene might be connected with some aspects of bladder cancer cell metastasis in vitro and has an influence on MMP-2 and MMP-9 expression levels.