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751.
752.
Niedzwiedzki Dariusz M. Swainsbury David J. K. Hunter C. Neil 《Photosynthesis research》2020,144(2):155-169
Photosynthesis Research - Six variants of the LH2 antenna complex from Rba. sphaeroides, comprising the native B800-B850, B800-free LH2 (B850) and four LH2s with various (bacterio)chlorophylls... 相似文献
753.
Kulus Dariusz de Dieu Muhire Jean Aksoy Barkin 《Journal of Plant Growth Regulation》2021,40(4):1521-1538
Journal of Plant Growth Regulation - The aim of this study is to analyze the morphogenetic events in Lamprocapnos spectabilis (L.) Fukuhara (bleeding heart) ‘Gold Heart’ and... 相似文献
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Autometallographic enhancement of the Golgi-Cox staining enables high resolution visualization of dendrites and spines 总被引:1,自引:0,他引:1
We present a method for autometallographic (AMG) enhancement of the Golgi-Cox staining enabling high resolution visualization
of dendrites and spines. The method is cheaper and more flexible than conventional enhancement procedures performed with commercial
photographic developers. The staining procedure is thoroughly described and we demonstrate with qualitative and quantitative
data, how histological tissue sectioning, Golgi-Cox immersion time and different AMG enhancement length may influence the
staining of dendrites and spines in the rat hippocampus. The described method will be of value for future behavioural-anatomical
studies, examining changes in dendrite branching and spine density caused by brain diseases and their subsequent treatment. 相似文献
756.
Magdalena Izdebska Dariusz Grzanka Lidia Gackowska Agnieszka Żuryń Alina Grzanka 《Central European Journal of Biology》2009,4(3):351-361
The aim of this study was to show the influence of Trisenox (arsenic trioxide, ATO) on cytoplasmic and nuclear F-actin organization
in HL-60 human leukemia cell line. Changes in localization were determined with the use of fluorescence microscopy and flow
cytometry. Alterations, in both cytoplasmic and nuclear actin, were observed in cells exposed to ATO. F-actin network underwent
accumulation and formed aggregates, that were very often placed under the cell membrane in whole cells and at the periphery
of isolated nuclei. Addition of ATO also induced apoptosis and a decrease in G2 phase cells. These results suggest the influence
of actin on the formation of apoptotic bodies and also participation of this protein in apoptotic alterations within nuclei,
i.e. chromatin reorganization. 相似文献
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Dariusz M. Niedzwiedzki Haijun Liu Min Chen Robert E. Blankenship 《Photosynthesis research》2014,121(1):25-34
Chlorophyll f is a photosynthetic pigment that was discovered in 2010. In this study, we present investigations on spectral and dynamic characteristics of singlet-excited and triplet states of Chl f with the application of ultrafast time-resolved absorption and fluorescence spectroscopies. The pigment was studied at room temperature in two organic solvents: pyridine and diethyl ether that have different characters of coordination of the chlorophyll magnesium (Mg) atom (hexa- and penta-coordination, respectively). Cryogenic measurements (77 K) were performed in 2-methyltetrahydrofuran (hexa-coordination). The singlet-excited state lifetime was measured to be 5.6 ns at room temperature regardless of Mg coordination and 8.1 ns at 77 K. The fluorescence quantum yield of Chl f was also determined in pyridine to be 0.16. The triplet state lifetime was studied in detail in pyridine at room temperature, and the inherent lifetime was estimated to ~150 μs. Selective measurements at 77 K demonstrated that the metastability of the triplet state greatly enhances, and its lifetime increases by a factor of more than three. 相似文献
760.
Dariusz L. Szlachetko 《Brittonia》1995,47(2):143-146
Two new species of the orchid subtribe Spiranthinae are described—Sauroglossum dromadum andS. organense. Illustrations of the new entities are provided and their systematic positions are briefly discussed. 相似文献