Lam, KP; Hitchcock, AP; Obst, M; Lawrence, JR; Swerhone, GDW; Leppard, GG; Tyliszczak, T; Karunakaran, C; Wang, J; Kaznatcheev, KV; Bazylinski, DA; Lins, U: Characterizing magnetism of individual magnetosomes by X-ray magnetic circular dichroism in a scanning transmission X-ray microscope, Chemical Geology, 270(1-4), 110-116 (2010), online: 22.11.2009, doi:10.1016/j.chemgeo.2009.11.009 [Link]
Abstract:

Soft X-ray scanning transmission X-ray microscopy (STXM) was used to measure the Fe L2, 3 X-ray magnetic circular dichroism (XMCD) signal from individual, 30 nm diameter magnetosomes in a magnetotactic bacterium, specifically the marine vibrio strain MV-1. The Fe L2, 3 spectra recorded with circularly polarized X-rays from an elliptically polarizing undulator were very similar in shape and magnitude to those of fully saturated magnetite (Fe3O4). As previously determined by other techniques, our results show that the magnetic moments of individual magnetosomes arranged in linear chains in intact cells of strain MV-1 are all oriented in the same direction. The magnitude of the XMCD signal averaged over a chain of 9 magnetosomes in one cell is similar to that of single crystal magnetite. The spectral shape is slightly different, and indicates that magnetosomes have excess Fe(II), as noted in previous bulk studies of biogenic magnetite. To our knowledge, this is the first measurement of the XMCD of individual magnetosomes in magnetotactic bacteria.

Aktuelle Termine

BayCEER-Kolloquium:
Do. 09.07.2020
Physical constraints and biological controls of plant-environment interactions
Do. 09.07.2020
Presentations W1/W3 Professorship Geoinformatics and Spatial Big Data
Do. 16.07.2020
Verschoben auf WS 2020/21! Investigating communal pathogen defense and its role in social evolution
Ökologisch-Botanischer Garten:
Mi. 01.07.2020 aktuell
Alle Termine im Juli 2020 entfallen!
Fr. 03.07.2020 aktuell
Gewächshäuser ab sofort wieder geöffnet!
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
07.05.2019
EGU – interesting research and free coffee
RSS Blog als RSS Feed
Wetter Versuchsflächen
Globalstrahlung: 596 W/m²
Lufttemperatur: 21.2 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 10 h/d
Wind (Höhe 32m): 12.8 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen