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<b>Abstract</b>— <p>The work presents the results on the effect of ultralow magnetic field (MF) on the viability, growth characteristics, respiratory activity, and antagonistic properties of microscopic fungi. The experiments were carried out using the strains isolated from the International Space Station internal volume. Hypomagnetic conditions (HMC) were established using the HMC-1 and HMC-2 hypomagnetic chambers screening the MF of Earth. The walls of the chambers are two-section magnetic screens made of an amorphous permalloy band. In our experiments, the HMC chambers caused a 1000–2000-fold decrease in the geomagnetic field. The highest MF value after demagnetizing was 45 nT. As a rule, hypomagnetic field (HMF) had no inhibitory and/or stimulating effect on spore viability and colony growth, as was evidenced by the absence of significant differences in CFU number, spore germination ratio, and radial growth rate of the colonies under HMC compared to geomagnetic conditions. At the same time, in some cases the micromycetes developing on the surface of construction material samples under limited nutrient supply exhibited significantly higher growth and respiration rates under HMF conditions. HMF was also found to affect the antagonistic properties of some micromycetes. HMC-grown <i>Penicillium rugulosum</i> strain 633.12 lost completely its antagonistic activity against bacteria, which was high under the standard geomagnetic conditions. The results are discussed in the context of microbial colonization of environments of the future lunar complexes.</p>

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Development of Microscopic Fungi in Ultralow Magnetic Fields

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • V. D. Rodimin,
  • S. A. Kharin,
  • S. V. Poddubko,
  • A. V. Kurakov,
  • S. A. Kulachkova,
  • M. M. Yarmeeva,
  • V. M. Lebedev,
  • A. V. Spasskii

摘要

Abstract—

The work presents the results on the effect of ultralow magnetic field (MF) on the viability, growth characteristics, respiratory activity, and antagonistic properties of microscopic fungi. The experiments were carried out using the strains isolated from the International Space Station internal volume. Hypomagnetic conditions (HMC) were established using the HMC-1 and HMC-2 hypomagnetic chambers screening the MF of Earth. The walls of the chambers are two-section magnetic screens made of an amorphous permalloy band. In our experiments, the HMC chambers caused a 1000–2000-fold decrease in the geomagnetic field. The highest MF value after demagnetizing was 45 nT. As a rule, hypomagnetic field (HMF) had no inhibitory and/or stimulating effect on spore viability and colony growth, as was evidenced by the absence of significant differences in CFU number, spore germination ratio, and radial growth rate of the colonies under HMC compared to geomagnetic conditions. At the same time, in some cases the micromycetes developing on the surface of construction material samples under limited nutrient supply exhibited significantly higher growth and respiration rates under HMF conditions. HMF was also found to affect the antagonistic properties of some micromycetes. HMC-grown Penicillium rugulosum strain 633.12 lost completely its antagonistic activity against bacteria, which was high under the standard geomagnetic conditions. The results are discussed in the context of microbial colonization of environments of the future lunar complexes.