Original Paper
distortions were dramatic at 500 and 800 ppm. EDX detected Co uptake through the hyphae, microconidia, macroconidia, and chlamydospores. Iron, calcium, and potassium were also detected. EDX results showed a linear relationship between Co% and Fe% up to a concentration of 500 ppm reflecting the possible ability of the isolate to synthesize intracellular siderophores storing iron and their release from the vacuoles. The participation of such siderophoresin conferring tolerance against cobalt is discussed
Farrag M. Rasha
Polish Journal of Microbiology , ISSUE 2, 235–243
Original Paper
with 125I. The uptake of iron by enterococciwas determined using 59Fe labelled proteins. Reduction of iron bound to TR and LF was assayed with ferrozine. The proteolytic cleavage of TR and LF was visualized by SDS-polyacrylamide gel electrophoresis. The siderophore activity was measured with chrome azurol S. The study revealed that enterococci use several ways to acquire iron from TR and LF, such as iron chelating siderophores, iron reduction – facilitated iron release, protein degradation
Paweł Lisiecki
Polish Journal of Microbiology , ISSUE 4, 419–425
Original Paper
produced indole acetic acid (61.5%), and six isolates produced siderophores (46.2%). Three highest phosphate-dissolving bacterial isolates, namely, M01, M04, and M11, were evaluated for their beneficial effects on the early growth of tomato plants (Solanum lycopersicum L. Wanza 15). Strains M01, M04, and M11 significantly increased the shoot dry weight by 30.5%, 32.6%, and 26.2%, and root dry weight by 27.1%, 33.1%, and 25.6%, respectively. Based on 16S rRNA gene sequence comparisons and
Jian Zhang,
Pengcheng Wang,
Ling Fang,
Qi-An Zhang,
Congsheng Yan,
Jingyi Chen
Polish Journal of Microbiology , ISSUE 1, 57–65
Original Paper
supplemented with 1 μg Cd ml–1 and those cultivated at 10 μg Cd ml–1. After three weeks of F. ovina cultivation, the number of bacterial CFU and the amounts of organic chelators, siderophores, proteins and reducing sugars in the growth medium and on the root surface were higher at 10 than at 1 μg Cd ml–1. The grass also reacted to the high Cd concentration by a decrease in plant growth and dehydrogenase activity in root tissues. The concentration of Cd determined in fractions
Małgorzata Majewska,
Anna Słomka
Polish Journal of Microbiology , ISSUE 2, 191–200
Article
-dependent alcohol dehydrogenases, as well as the LysE-type exporter of amino acids. This indicates that (p)ppGpp influences the processes of fermentation and export of amino acids [11].
3.1.
The role of the stringent response in the production of siderophores and antibiotics
The stringent response regulates the production of substances secreted by bacteria, including siderophores, i.e. carriers of iron ions. One of such compounds is pyoverdine, which demonstrates fluorescence and bactericidal
Julia Berdychowska,
Justyna Boniecka,
Grażyna B. Dąbrowska
Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 2, 127–142