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Współpraca Edwarda Schuncka z Leonem Marchlewskim w świetle zachowanej korespondencji

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Przybyszewska M., Wasiewicz B.
Kwartalnik Historii Nauki i Techniki
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2018
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vol. 63
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issue 3
35–62
EN
Edward Schunk and Leon Marchlewski were to play a decisive part in the history of research on chemistry of chlorophyll and its derivatives. During only a few-year stay of Marchlewski in the Schunck laboratories in Kersal outside Manchester, a groundbreaking invention in the history of biochemistry took place: the close chemical relationship on the level of chlorophyll derivatives and haemoglobin was revealed. Also then, despite a considerable age difference between them, Schunk, who was at the end of his scientific career and Marchlewski just at the start, they became close friends. On the basis of the collection of original Schunk’s letters to Marchlewski, written in the years 1889–1902, we tried to reconstruct the character of their relationship in science, confronting topics raised in the letters with works published at the time. We sought to establish whether Schunk could have been inspired by research of his Polish colleague and, in turn, if remarks and suggestions of the Englishman could have influenced Marchlewski’s research programme. For better understanding the field of research of both scientists, we also shortly described the state of knowledge on chlorophylls and their derivatives at the turn of the 19th and 20th centuries.
2

Wpływ promieniowania gamma na kondycję roślin zimozielonych na przykładzie żywotnika zachodniego (Thuja occidentalis)

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Sarnek M., Szopa P., Czerniak J., Gajewski A.
Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie
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2016
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issue 8(956)
107-115
PL
W artykule poruszono kwestię przydatności żywotnika zachodniego (Thuja occidentalis) jako biowskaźnika w przypadku skażenia spowodowanego izotopami promieniotwórczymi, w szczególności izotopami gamma promieniotwórczymi. W tym celu rośliny poddano ekspozycji na promieniowanie emitowane przez izotop sodu 22Na, a po ekspozycji przeprowadzono analizę emisji fluorescencji pochodzącej od wzbudzenia chlorofilu całkowitego w zależności od czasu narażenia roślin na to promieniowanie. Analizę przeprowadzono metodą spektrofluorymetryczną. Stwierdzono, że w wyniku narażenia badanej rośliny na promieniowanie gamma następuje zmniejszenie chlorofilu całkowitego, a co za tym idzie, żywotnik zachodni może być traktowany jako biowskaźnik w przypadku skażenia środowiska izotopami gamma promieniotwórczymi.
EN
The article examines the suitability of the American Arborvitae (Thuja occidentalis) as a biomarker in cases of chlorophyll contamination caused by gamma radiation. Prior to the analysis, the samples were irradiated by isotop 22Na. Following exposure, the samples were analysed with spectrofluorescence, during which fluorescence emission comes from the excitation of chlorophyll. Our results showed that gamma irradiation leads to a reduction in the chlorophyll content. Therefore Thuja occidentalis can be treated as a biomarker for gamma radiation.
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