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Microbial Nutrition01:28

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
Microbes and Other Elemental Cycles01:24

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Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
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Updated: Jul 7, 2026

Synthesis of Functionalized Magnetic Nanoparticles, Their Conjugation with the Siderophore Feroxamine and its Evaluation for Bacteria Detection
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Published on: June 16, 2020

Nanobacteria are mineralo fetuin complexes.

Didier Raoult1, Michel Drancourt, Saïd Azza

  • 1Unité des Rickettsies, Centre National de la Recherche Scientifique UMR 6020, IFR 48, Faculté de Médecine, Marseille, France. Didier.Raoult@medecine.univ-mrs.fr

Plos Pathogens
|February 20, 2008
PubMed
Summary

"Nanobacteria" are not living organisms but self-propagating mineral complexes called "nanons." Fetuin plays a paradoxical role in their formation and in kidney stones, challenging previous beliefs about calcification.

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Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles

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Area of Science:

  • Microbiology
  • Geology
  • Biochemistry
  • Mineralogy

Background:

  • Controversial nanometer-scale particles, termed "nanobacteria," have been proposed as novel life forms.
  • Their biological nature is debated, with alternative explanations suggesting they are mineral structures.
  • These particles have been implicated in various calcification-related diseases.

Purpose of the Study:

  • To investigate the biological nature of "nanobacteria" through comprehensive analysis.
  • To determine the role of specific compounds and proteins in the formation of these particles.
  • To clarify the association between "nanobacteria" and pathological calcification.

Main Methods:

  • Analysis of "nanobacteria" susceptibility to physical and chemical agents.
  • Comprehensive nucleotide, biochemical, proteomic, and antigenic analysis of the particles.
  • Investigation of fetuin's role in particle formation and presence in renal calculi.

Main Results:

  • Definitive evidence ruling out "nanobacteria" as living organisms.
  • Identification of fetuin, an anti-mineralization protein, as a key factor in forming self-propagating mineral complexes, now termed "nanons."
  • Detection of fetuin within renal calculi, indicating its role in hydroxyapatite nucleation.

Conclusions:

  • "Nanobacteria" are not microorganisms but abiotic mineral formations named "nanons."
  • Fetuin paradoxically acts as a nucleating factor in "non" formation and renal calculus development.
  • This study reclassifies "nanobacteria" and clarifies their role in biomineralization processes.