A G Jánossy | PubMed Health

PubMed1977

X-ray microanalytical study of Mn and Fe compartmentation in maize chloroplasts.

X-ray microanalysis of mesophyll and bundle sheath maize chloroplasts showed that bound manganese is located within thylakoids, whereas bound iron is equally present in thylakoids and stroma. A simple correlation between manganese content and oxygen evolution capacity (Photosystem II activity) is unlikely since Mn is also present in bundle sheath thylakoids of low Photosystem II activity. A major part of manganese has probably a distinct function and only a minor part plays a role in the process of oxygen evolution.

Chloroplasts↗

PubMed1977

[X-ray microanalysis of elements in epon-embedded animals tissues].

X-ray microanalysis was performed on ultrathin sections of tissues from six rats, four of which having been exposed to experimental metabolic disorder by overdoses of NaCl and Ca-Vit. D2, respectively. It was demonstrated that the elements Cl, Si, P, S, Ca and traces of Fe are identifiable quantitatively in arteriolar walls of colon, heart and kidney even after conventional electron microscopic preparation (fixation, dehydration and Epon embedding). Depending on the pretreatment considerable differences in elemental quantities between animal groups were observed. The reliability of these findings must be confirmed by further tests on a greater number of individuals.

Animals↗