Habits of magnetosome crystals in coccoid magnetotactic bacteria.

Appl Environ Microbiol

Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes, CCS, Bl. I, Universidade Federal do Rio de Janeiro, 21941-590, Rio de Janeiro, RJ, Brazil.

Published: August 2005

High-resolution transmission electron microscopy and electron holography were used to study the habits of exceptionally large magnetite crystals in coccoid magnetotactic bacteria. In addition to the crystal habits, the crystallographic positioning of successive crystals in the magnetosome chain appears to be under strict biological control.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1183320PMC
http://dx.doi.org/10.1128/AEM.71.8.4902-4905.2005DOI Listing

Publication Analysis

Top Keywords

crystals coccoid
8
coccoid magnetotactic
8
magnetotactic bacteria
8
habits magnetosome
4
magnetosome crystals
4
bacteria high-resolution
4
high-resolution transmission
4
transmission electron
4
electron microscopy
4
microscopy electron
4

Similar Publications

Silicified peritidal carbonates of the Tonian Draken Formation, Spitsbergen, contain highly diverse and well-preserved microfossil assemblages dominated by filamentous microbial mats, but also including diverse benthic and/or allochthonous (possibly planktonic) microorganisms. Here, we characterize eight morphospecies in focused ion beam (FIB) ultrathin sections using transmission electron microscopy (TEM) and X-ray absorption near-edge structure (XANES) spectromicroscopy. Raman and XANES spectroscopies show the highly aromatic molecular structure of preserved organic matter.

View Article and Find Full Text PDF

The approved method for testing the efficacy of ballast water management systems with respect to killing 10-50 μm organisms uses movements of the organisms or the vital stains CMFDA/FDA. The present study demonstrates that certain freshwater coccoid chlorophytes, known or suspected to contain a highly resistant cell wall component (algaenan), stain poorly with CMFDA/FDA, resulting in false negatives. The staining rates for the most dominant species were determined and were approx.

View Article and Find Full Text PDF

Dolomite (CaMg(CO ) ) precipitation is kinetically inhibited at surface temperatures and pressures. Experimental studies have demonstrated that microbial extracellular polymeric substances (EPS) as well as certain clay minerals may catalyse dolomite precipitation. However, the combined association of EPS with clay minerals and dolomite and their occurrence in the natural environment are not well documented.

View Article and Find Full Text PDF

Identification and Genomic Characterization of Two Previously Unknown Magnetotactic .

Front Microbiol

July 2021

Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

Magnetotactic bacteria (MTB) are a group of microbes that biomineralize membrane-bound, nanosized magnetite (FeO), and/or greigite (FeS) crystals in intracellular magnetic organelle magnetosomes. MTB belonging to the phylum can form up to several hundreds of FeO magnetosome crystals and dozens of sulfur globules in a single cell. These MTB are widespread in aquatic environments and sometimes account for a significant proportion of microbial biomass near the oxycline, linking these lineages to the key steps of global iron and sulfur cycling.

View Article and Find Full Text PDF

is a ubiquitous foodborne pathogen that results in a high rate of mortality in sensitive and immunocompromised people. Contamination of food with is thought to occur during food processing, most often as a result of the pathogen producing a biofilm that persists in the environment and acting as the source for subsequent dispersal of cells onto food. A survey of seafood-processing plants in New Zealand identified the persistent strain 15G01, which has a high capacity to form biofilms.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!