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1

Intercellular cytoplasm transport during oogenesis of the moth midge, Tinearia alternata Say (Diptera: Psychodidae)

100%
Mazurkiewicz M., Kubrakiewicz J.
Folia Biologica
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2001
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vol. 49
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issue 3-4
205-213
EN
Polytrophic ovaries of the nematocerous dipteran, Tinearia alternata Say consists of several developmentally synchronized ovarioles each housing only one functional egg chamber with 15 nurse cells and an oocyte. At the early stages of previtellogenesis the nurse cells become polyploid and synthetically active. Their nuclei contain polytene chromosomes and prominent nucleoli. With the advance of previtellogenic growth the nurse cell cytoplasm is loaded with the growing number of ribosomes and contain perinuclear nuage material, mitochondria, electron dense bodies and aggregations of endoplasmic reticulum. All these organelles are transported into the oocyte thanks to the massive and rapid flow of the nurse cell cytoplasmic contents. Nurse cell?oocyte transport is mediated by actin cytoskeleton. Prior to the rapid cytoplasm transfer, F-actin network is associated with the nurse cell membranes while tiny bundles of microfilaments form actin baskets connected with ring canals. Nurse cells in Tinearia lack an extensive scaffold of radially oriented, F-actin bundles (cables) that would tether their nuclei in place, thus preventing ring canals from plugging. The way the nuclei are anchored to their central positions within the cells remains unclear. Towards the final stages of oogenesis nurse cells are almost devoid of cytoplasm and degenerate. Although their nuclei undergo dramatic morphological transformations, typical hallmarks of apoptotic pathway could not be clearly observed. Rapid ooplasmic streaming does not occur.
2
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A survey of anti-Ostertagia ostertagii antibody levels in bulk tank milk samples (BTM) in dairy herds in Lower Silesia Region (Poland)

81%
Płoneczka-Janeczko K., Piekarska J., Rypuła K., Mazurkiewicz M.
Polish Journal of Veterinary Sciences
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2011
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issue 1
3
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Genetic comparison of Campylobacter jejuni isolated from different cattle farms

81%
Bednarski M., Wieliczko A., Mazurkiewicz M.
Polish Journal of Veterinary Sciences
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2011
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issue 2
4

The role of GABA-ergic system in carcinogenesis

81%
Szczaurska K., Mazurkiewicz M., Opolski A.
Postępy Higieny i Medycyny Doświadczalnej
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2003
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vol. 57
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issue 5
485-500
EN
The gamma-aminobutyric acid (GABA) is the major and the best known neurotransmitter with inhibitory properties in the central nervous system (CNS). Outside the CNS GABA acts as a regulator of muscle tension and controls the secretion of hormones. In the peripheral region, as in the CNS GABA?s function is known to be mediated by GABAA and GABAB receptors. Several recent reports have suggested a relationship between the GABA-ergic system and oncogenesis. It has been confirmed that both GABA content and GAD activity are increased in material from colon, breast, digestive tract, and ovarian cancer. In the light of theory of dynamic balance between stimulating and inhibitory amino acids, disturbances in GABA metabolism may be a sign of the cell?s defensive reaction during carcinogenesis.
5
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Magnetic Properties of "As-Prepared" and Chemically Modified Multiwalled Carbon Nanotubes

71%
Kuryliszyn-Kudelska I., Małolepszy A., Mazurkiewicz M., Stobinski L., Dobrowolski W.
Acta Physica Polonica A
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2011
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vol. 119
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issue 5
597-599
EN
In this work we have studied the structural and magnetic properties of "as-prepared" multiwalled carbon nanotubes, synthesized by the chemical vapor deposition method, and chemically modified multiwalled carbon nanotubes. Transmission electron microscopy was used to show multiwalled carbon nanotubes structure. The results of systematic magnetic property measurements on multiwalled carbon nanotubes are presented. The static and dynamic magnetic responses, such as the temperature dependence of the linear AC susceptibility and DC magnetization up to 9 T were studied. We have observed significant changes in magnetic AC susceptibility and magnetization for "as-prepared" and chemically modified multiwalled carbon nanotubes samples.
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