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Wyświetlanie 1-3 z 3
Tytuł:
Łamliwe miejsca chromosomu
Chromosome fragile sites
Autorzy:
Wójcik, Ewa
Smalec, Elżbieta
Góral, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/1196856.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
Fragile sites on chromosomes are the sites which exhibit tendency towards breaks and gaps under specific conditions of in vitro cultured cells, and after induction with chemical agents. They are categorised as either rare and common. Fragile sites are evolutionary conserved. They are observed in all organisms and play a significant role as far as an occurrence of gene and chromosome disorders in animals and humans is concerned, thus constituting instable regions of the genome. The instabilities may initiate inappropriate expression of genes determining various characteristics. They may give rise to developmental disorders, high mortality at an early stage of life, poorer animal liveability and reproduction as well as tumour expansions. Fragile sites constitute a subject of cytogenetic studies in diagnosing genetic disorders. They can also serve as a selection tool in an assessment of health, and identification of individuals with genetic disorders.
Źródło:
Kosmos; 2009, 58, 1-2; 135-142
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wymiana chromatyd siostrzanych w chromosomach
Sister chromatid exchange in chromosomes
Autorzy:
Wójcik, Ewa
Smalec, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1195929.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
Sister chromatid exchange (SCE) is a reciprocal exchange of homologous chromatids of the same chromosome. SCEs result from replicating DNA from a damaged matrix and can occur only when changes in DNA have not been removed before the cell enters phase S of the cell cycle when condensed sister chromatids "pair" and exchanges take place between identical DNA sequences situated close to each other. Sister chromatid exchanges are often used in biomonitoring of potentially carcinogenic substance genotoxicity. Due to their sensitivity they enable determining the degree of DNA damage or deficiencies in its repair. The SCE test answers the question of how much chromosomes are sensitive to the damaging factor and how strong the genotoxic impact of the factor is. The SCE is a reliable technique which makes it possible to select from a populations the individuals which are genetically most prone to illnesses and to remove them from further reproduction and breeding.
Źródło:
Kosmos; 2010, 59, 3-4; 513-526
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Telomery - duża rola małych sekwencji
Telomeres - a significant role of small sequences
Autorzy:
Gągała, Urszula
Andraszek, Katarzyna
Wójcik, Ewa
Smalec, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1197489.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
Telomeres are distal structures of eukaryotic chromosomes, which are responsible for their stability and functioning. They assure complete replication of terminal fragments of chromosomes, prevent degradation and fusion of chromosomes. Telomeres of most chordates are comprised of tandem repeats of the basic unit 5'-(TTAGGG)n-3'. The number of repeats of the basic telomeric sequence differs between the chromosomes of one and the same cell. However, in remains within the strictly determined range for a given species, for man it ranges from 2 to 30 th pairs of nucleotides. Younger cells have got longer telomeres whereas the telomeres of older cells are shorter. Cytogenetic studies on telomeric regions of chromosomes have gained significance since the moment of the discovery that this chromosomal fragment actively participates in the process of cancer development, cell ageing and apoptosis. Telomeres consist of non-coding DNA sequences. They contain no genes and they code no proteins but their role in medicine, genetics and evolutionary studies is becoming more and more significant.
Źródło:
Kosmos; 2008, 57, 3-4; 331-341
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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