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Effects of meso-2,3-dimercaptosuccinic acid, potassium iodide and chlorophyll on lead accumulation in male mice

100%
Xie Y., Zhou G.
International Journal of Occupational Medicine and Environmental Health
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2017
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vol. 30
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issue 1
87-93
EN
Objectives Lead (Pb) pollution is a serious public health problem all over the world, it especially plays severe damage role in children’s health. Apart from reducing lead-induced damages, the decrease of lead accumulation is also critical. This study has been the first attempt to investigate effects of meso-2,3-dimercaptosuccinic acid (DMSA), potassium iodide (KI) and chlorophyll (Chl) on lead accumulation in male mice. Material and Methods Eighty healthy Kunming male mice were selected and divided randomly into 8 groups. They were treated with lead acetate (PbAc) intraperitoneally, individually and in combination with the DMSA, KI or Chl once daily for 5 days. Meanwhile, the control group was treated with normal saline during the whole exposure period. On 30th day, mice were sacrificed and lead concentrations were detected in the whole blood, livers, kidneys, and testicles of mice by means of the graphite furnace atomic absorption spectrometry. Results In comparison with the control group, lead concentrations increased in mice treated with the PbAc and DMSA, KI and Chl diminished lead accumulation in the whole blood, livers, and kidneys. Chl had specifically the same effects on lead concentrations in the testicles of male mice. Conclusions Potassium iodide and Chl, as food additives, had the same effects as the DMSA to reduce lead accumulation in male mice effectively. Our results provided experimental evidence in vivo for the preventive measures of lead poisoning. Int J Occup Med Environ Health 2017;30(1):87–93
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Synthesis and Characterization of Natural Sensitizers for Dye Sensitized Solar Cells

100%
Kimpa M. I., Isah K. U., Yabagi J. A., Taufiq S., Agam M. A. B.
Path of Science
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2017
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vol. 3
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issue 10
2001-2006
EN
Natural dyes of anthocyanin extract from flame tree flower (Delonix regia) and chlorophyll extract from pawpaw leaf (Carica papaya) were used as sensitizer to fabricate dye sensitized solar cell (DSSC). The photoelectrode were subjected to UV/Vis spectrophotometer to view their absorbability. The photo electrochemical performances of DSSCs obtained from I.V characteristics showed conversion efficiency, (ɳ) of 0.80 % for the dye extracts from flame tree flower (anthocyanine), with open-circuit voltage (VOC) of 0.5249 mV, short-circuit current density (Isc) of 44.6191 mA/m2 and Fill factor (FF) of 0.5837. Chlorophyll dyes extract from pawpaw leaf has VOC, Isc, FF and conversion efficiency, (ɳ) of 0.5249 mV, 16.5283 mA/m2, 0.5585 and 0.27 % respectively. The conversion efficiency for the mixed dyes (anthocyanin and chlorophyll) at ratio 1:2 is 0.23 % with VOC, Isc and FF of 0.5500 mV, 14.2750 mA/m2 and 0.5451 respectively, while the dye mixture at ratio 1:4 achieved VOC of 0.5249 mV, Isc of 18.4941 mA/m2, FF of 0.5206 and conversion efficiency (ɳ) of 0.26 %. Anthocyanine from flame tree flower dye extract had the higher conversion efficiency of 0.8 % which could be better in term of application in dye solar cell.
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Wpływ promieniowania gamma na kondycję roślin zimozielonych na przykładzie żywotnika zachodniego (Thuja occidentalis)

84%
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.
4

Współpraca Edwarda Schuncka z Leonem Marchlewskim w świetle zachowanej korespondencji

84%
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.
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