Evolution structurale et fonctionnelle de l'appareil photosynthétique des spores de Funaria hygrometrica et de Bryum capillare au cours de leur germination

1974 ◽  
Vol 52 (5) ◽  
pp. 927-934 ◽  
Author(s):  
D. Chevallier ◽  
F. Nurit
Keyword(s):  
Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Chlorophyll Synthesis ◽  
Paramagnetic Resonance ◽  
Funaria Hygrometrica ◽  
Photosynthetic System ◽  
Inorganic Medium ◽  
Electron Paramagnetic ◽  
Isolated Chloroplasts

The mature spores of Funaria hygrometrica Hedw. contain proplasts that are transformed into chloroplasts in about 24 h, during germination on an inorganic medium in the light. The formation and aggregation of thylakoids are observed by electron microscopy. Studies on chlorophyll synthesis, CO2 fixation during germination, Hill's reaction (2,6-dichlorophenol–indophenol (DP1P)) by isolated chloroplasts, and electron paramagnetic resonance (EPR) signals suggest further correlations between plastid formation and functions.The results on Funaria spores are compared with results on Bryum spores. Mature Bryum capillare Hedw. spores contain chloroplasts that change only slightly during germination. The photosynthetic system of Funaria spores is compared with that of the chloroplasts of Bryum spores.

Electron paramagnetic resonance and microstructural insights into the thermal behavior of simonkolleite nanoplatelets

2020 ◽  
Vol 22 (17) ◽  
pp. 9503-9512
Author(s):  
Arpad Mihai Rostas ◽  
Andrei Cristian Kuncser ◽  
Daniela Ghica ◽  
Alexandra Palici ◽  
Valentin Adrian Maraloiu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Experimental Data ◽  
Thermal Decomposition ◽  
Electron Paramagnetic Resonance ◽  
Thermal Behavior ◽  
Decomposition Process ◽  
Thermal Decomposition Process ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The thermal decomposition process of simonkolleite, at 500 °C was monitored by EPR and electron microscopy. The experimental data indicate that after an 1 h at 500 °C, three morphologies can be observed from the thermal decomposition of ZHC.

Purity and Solubility of Nanotubes in Arc Discharge Carbon Powder

2000 ◽  
Vol 633 ◽  
Author(s):  
Jonathan N. Coleman ◽  
Alan B. Dalton ◽  
Brendan McCarthy ◽  
Robert C. Barklie ◽  
Werner J. Blau
Keyword(s):  
Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Carbon Material ◽  
Conjugated Polymer ◽  
Arc Discharge ◽  
Carbon Powder ◽  
Paramagnetic Resonance ◽  
Sample Bottle ◽  
Carbon Soot ◽  
Electron Paramagnetic

AbstractWe have described a novel experimental technique to separate nanotubes from other unwanted carbon species in arc generated carbon soot. A conjugated polymer was used to bind to nanotubes in solution. The resultant hybrid was soluble while extraneous carbon material formed a sediment at the bottom of the sample bottle. This process was monitored using electron paramagnetic resonance (EPR) which showed that 63% of nanotubes were kept in solution while 98.1% of impurities were rejected. This allowed the calculation of the nanotube content in the carbon soot using EPR and thermo-gravitational analysis (TGA) yielding a purity value of 34% for the soot used in this study. This is compatible with estimates made using electron microscopy.

Reactions of Aniline with Copper(II) Compounds in Relation to the Formation of Copper-Polyaniline Composites

2012 ◽  
Vol 65 (7) ◽  
pp. 723 ◽  
Author(s):  
Adeline Le Cocq ◽  
Marija R. Gizdavic-Nikolaidis ◽  
Allan J. Easteal ◽  
Graham A. Bowmaker
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Reaction Products ◽  
Paramagnetic Resonance ◽  
Structure And Morphology ◽  
Polyaniline Composites ◽  
Electron Paramagnetic ◽  
Scanning Electron

Reactions of aniline with copper(ii) sulfate, chloride, or bromide in aqueous solution, yielded copper(ii)-aniline complexes, in contrast to previously reported studies, which claimed the formation of copper-polyaniline composites. The structure and morphology of the powder products were characterized by scanning electron microscopy, Raman and Fourier transform infrared spectroscopy, and elemental analysis. An electron paramagnetic resonance (EPR) study was also carried out on the reaction products, confirming their characterization as copper(ii) compounds. None of the reaction products showed significant conductivity, and none of the copper(ii)/aniline reactions resulted in the formation of polyaniline, contrary to previous claims in the literature.

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