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A cytological, morphometric, and ecological study of \kur{Spergularia echinosperma} in the Czech Republic and its comparison with a closely similar species S. \kur{rubra} / A cytological, morphometric, and ecological study of \kur{Spergularia echinosperma} in the Czech Republic and its comparison with a closely similar species S. \kur{rubra}KÚR, Pavel January 2010 (has links)
In the present study, I dealt with morphological, cytological, and ecological research on a rare Central-European species Spergularia echinosperma and its comparison with a similar weedy species S. rubra. Existence of two cytotypes of S. echinosperma significantly differing in their morphology was revealed, as well as distinct morphological differences between the two species were found. Moreover, the analyses revealed one possibly hybridogenous population. In addition, both the species and the cytotypes were also proven to display different germination behavior, which I correlate with their individual ecological adaptations.
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Utbyte av xylen till Tissue Clear som avparaffineringsmedel vid diagnostik av endometrioid carcinom med DNA-ploidi / Exchange xylene to Tissue Clear as deparaffinization agent in DNA ploidy analysis of endometrial carcinoma samplesSandberg, Therese, Fridén, Rebecka January 2020 (has links)
Flödescytometrisk analys av DNA-ploiditeten används vid diagnostisering av endometriecancer. DNA-ploidi reflekterar cellcykeln och avgör om tumörens cellpopulationen är diploid eller aneuploid, där aneuploiditet förknippas med sämre prognos. Vid analys av paraffininbäddat vävnadsmaterial används avparaffineringsmedlet xylen, vars toxiska egenskaper försämrar arbetsmiljön på laboratoriet. Den har en stark och obehaglig lukt som kan orsaka illamående och yrsel. Syftet med studien var att undersöka om xylen kan ersättas med xylensubstitutet Tissue Clear, ett isoparaffinskt kolväte som är mindre toxiskt. Studien omfattade paraffininbäddad humanvävnad från endometrioid carcinom (n=20), både diploid (n=15) och aneuploid (n=5) vävnad, som avparaffinerades med xylen respektive Tissue Clear innan DNA-ploidi utfördes. Eventuella skillnader inom de flödescytometriska parametrarna % CV-diploid, % S-fas, % debris och DI-aneuploid undersöktes och vid statistisk analys kunde ingen signifikant skillnad ses på samtliga parametrar. Eftersom analysen utförs sällan i rutin är antalet prover i studien relativt stor, trots att detta kan anses vara en liten kvantitet. Av dessa var endast 25 % av proverna aneuploida. Att en patient uppvisar aneuploiditet är ovanligt och därför ansågs även denna mängd som tillräckligt stor. Studien visar att avparaffinering med Tissue Clear är ekvivalent med xylen och därmed kan Tissue Clear ersätta xylen oavsett om vävnaden är diploid eller aneuploid. / DNA ploidy is used for endometrial cancer diagnosis. It reflects the cell cycle and determines whether the cell population in tumors is diploid or aneuploid. When analyzing paraffin embedded tissues xylene can be used for deparaffinization, whose toxicity impairs the laboratory´s work environment. Its strong and unpleasant smell can cause nausea and dizziness. The aim of this study was to investigate if xylene can be replaced with Tissue Clear, an isoparaffinic hydrocarbon that is less toxic. The study included paraffin embedded human tissues from endometrioid carcinoma (n=20), both diploid (n=15) and aneuploid (n=5), deparaffinized with xylene or Tissue Clear before DNA ploidy was performed. Potential differences between the parameters % CV-diploid, % S-phase, % debris and DI-aneuploid were statistically examined and showed no significant differences. The sample amount in this study might be considered low, though it is relatively high since the analysis is rarely performed routinely. Among these only 25 % were aneuploid. Patients showing aneuploidy is rare and the amount was therefore considered to be sufficient as well. The study shows that deparaffinization with Tissue Clear generates equivalent results as for xylene and can thereby replace xylene regardless if the tissue is diploid or aneuploid.
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