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Original Paper

Intracellular Siderophore Detection in an Egyptian, Cobalt-Treated F. solani Isolate Using SEM-EDX with Reference to its Tolerance

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

Transferrin and Lactoferrin – Human Iron Sources for Enterococci

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

Isolation and Characterization of Phosphate-Solubilizing Bacteria from Mushroom Residues and their Effect on Tomato Plant Growth Promotion

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

Levels of Organic Compounds, Number of Microorganisms and Cadmium Accumulation in Festuca ovina Hydroponic Culture

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

THE STRINGENT RESPONSE AND ITS INVOLVEMENT IN THE REACTIONS OF BACTERIAL CELLS TO STRESS

-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

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