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Magnetotactic bacteria

About: Magnetotactic bacteria is a research topic. Over the lifetime, 1118 publications have been published within this topic receiving 43741 citations.


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Patent
11 May 2016
TL;DR: In this article, a bacterial magnetic particle with recombinant protein G expression capability is obtained by performing enlarged culture and separation and purification on magnetotactic bacteria MSR-1 recombinant strains.
Abstract: The invention provides bacterial magnetic particles with recombinant protein G expression capability. The bacterial magnetic particle with recombinant protein G expression capability are obtained by performing enlarged culture and separation and purification on magnetotactic bacteria MSR-1 recombinant strains. The invention further provides application of the bacterial magnetic particles with recombinant protein G expression capability in detection of blood type irregular antibody IgG. By use of the magnetic property of the bacterial magnetic particles and the effect of an applied magnetic field, the bacterial magnetic particles with recombinant protein G expression capability, provided by the invention, are capable of assisting agglutination of sensitized erythrocytes, so that on the one hand, the usage amount of the bacterial magnetic particles is reduced to the greatest extent, and on the other hand, the detection sensitivity of low-potency IgG antibodies is improved to the greatest extent.

3 citations

Journal ArticleDOI
TL;DR: The genomic DNA analysis using pulse field gel electrophoresis shows that estimated the size of genomic DNA, consistent with ‘Magnetospirillium gryphiswaldense MSR-1’ the isolated strain significantly shows similarity to the a-subgroup of Proteobacteria.
Abstract: The aim of the present study was to isolate, cultivate and characterize Magnetotactic Bacteria detected in Microcosms collected from north India, and to compare the Genomic DNA of isolated DNA with the ‘Magnetospirillium gryphiswaldense MSR-1’ for the analysis of the size of genomic DNA. The microcosms collected from North India were subjected to study the physiochemical properties such as dissolved oxygen and pH. The isolation of Magnetotactic Bacteria was done by applying Capillary Racktrack method and to grow in double gradient medium. The genomic DNA was isolated and analyzed using pulse field gel electrophoresis. The outcomes of the study show the co-relation between physiochemical properties and the growth rate of the Bacterial strain was 34 times more than the dry weight of iron concentration. The genomic DNA analysis using pulse field gel electrophoresis shows that estimated the size of genomic DNA, consistent with ‘Magnetospirillium gryphiswaldense MSR-1’ The isolated strain significantly shows similarity to the a-subgroup of Proteobacteria. The bacteria were highly applicable in various fields of Science and Technology due to there antitoxic property.

3 citations

Journal ArticleDOI
TL;DR: Important findings in the field of operons and genes as controllers of magnetosome biogenesis are introduced, including the mamAB operon is found to be more critical than other operons to magnetosomes biogenesis and it is necessary for rudimentary biomineralization in bacteria.
Abstract: Magnetosomes are natural magnetic nanoparticles with special properties that are synthesized by magnetotactic bacteria. Bacterial magnetosomes have become increasingly attractive for researchers in biology, medicine, geology and other fields of scientific researches. It is significant to explore a promising nanomaterial for multiple applications in science and industry. Magnetosomes contains magnetic particles that are enclosed by intracellular membrane. These particles can be either ferrimagnetic crystal of magnetite (Fe3O4) or the iron sulfide greigite (Fe3S4). Three crystal morphologies including roughly cuboidal, roughly rectangular, bullet-shaped have been found in magnetotactic bacteria. Magnetosomes are organized as well-ordered chains which orient magnetotactic bacteria in geomagnetic fields. The question ‘what and how is genetic material responsible for magnetosome genesis and following diversity’ was raised when biologists tried to understand the formation mechanism of magnetosome in the last century. Now almost two decades have passed since 2000, magnetosome biogenesis still remains one of the hotspots in scientific researches. Both bioinformatic analyses and gene deletion experiments are extensively carried out in the study of magnetosome biogenesis. Consequently, multiple operons and genes are found to be involved in the process of magnetosome formation. This article introduces important findings in the field of operons and genes as controllers of magnetosome biogenesis. The mamAB operon is found to be more critical than other operons to magnetosome biogenesis and it is necessary for rudimentary biomineralization in bacteria. Less than 10 genes within the mamAB operon are essential for the magnetosome formation. Moreover, other four small operons ( mamGFDC , mamXY , mms6 and feoAB1 ) play non-critical roles for magnetosome biogenesis. Non-essential genes can be found in both the mamAB operon and non-critical operons. In addition, several genes and genomic regions outside of magnetosome-related operons such as the mms16 gene in Magnetospirillum magneticum AMB1 or the mad gene clusters in Deltaproteobacteria are also related to magnetosome synthesis. These discoveries provide insights into the molecular mechanisms of magnetosome biogenesis. Some researchers have separated the whole process of magnetosome formation into three or five key steps, they proposed several hypothesized mechanisms of magnetosome formation in magnetotactic bacteria by summarizing functional genes and proteins in each of key steps. The Arakaki’s model in 2018 is a relatively comprehensive model of magnetosome formation and can offer detail information about molecular and cellular mechanisms. With rapid development of research on magnetotactic bacteria emerging in China in recent years, Chinese scientists have made various types of research achievements such as discoveries of novel magnetotactic bacteria, calculations of diversity of magnetotactic bacteria in specific water areas and evolutionary mechanism of microbial magnetoreception. It is expected that more valuable achievements would be obtained from bacterial research than ever before. Natural magnetic nanoparticles have potentials to bring many advancements in science and they can help overcome technical challenges in various scientific fields. To release the power within magnetosomes, biologists are required to reveal the genetic foundation of magnetosome biogenesis and help material scientists invent new technology using biological knowledge. Magnetosome researches are attracting more and more scientists from all areas of science. Interdisciplinary research has become an increasingly common method of study in magnetosome. How well the material scientists can cooperate with other scientists will be crucial for important discoveries in magnetosomes in the future.

2 citations

Journal ArticleDOI
TL;DR: In this article, the principles of sample selection for the national biobank-depository of the living systems are described on the basis of petro- and paleomagnetic methods for the investigation of biomineralization.
Abstract: Magnetotactic bacteria that produce nanosized crystals of magnetite or greigite (or both minerals) inside cells in the processes of life play an important role in the biogeochemical processes, for example, in the iron and sulfur cycle, as well as in natural residual magnetization of sedimentary rocks. Despite decades of investigation, knowledge of their abundance and ecology is still limited. The principles of sample selection for the national biobank–depository of the living systems are described on the basis of petro- and paleomagnetic methods for the investigation of biomineralization.

2 citations

Book ChapterDOI
01 Jan 1991
TL;DR: In this article, two examples of biological magnetic fine particles are considered: iron-storage proteins and magnetotactic bacteria, and they cover many aspects of this field, including the use of well-defined biological systems for testing theoretical models, using magnetic properties to distinguish between different biological materials, producing magnetic materials by biological processes, and using optimised biological magnetic systems as a guide to the production of synthetic magnetic materials.
Abstract: Two examples of biological magnetic fine particles are considered: iron-storage proteins and magnetotactic bacteria. These cover many aspects of this field, including the use of well-defined biological systems for testing theoretical models, using magnetic properties to distinguish between different biological materials, producing magnetic materials by biological processes, and using optimised biological magnetic systems as a guide to the production of synthetic magnetic materials.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202339
202288
202137
202061
201950
201873