According to a report from the American Association for the Advancement of Science website on December 27, an international research group composed of institutions such as the University of Nevada at the University of Las Vegas (UNLV) and the National Research Center of France has recently been on the verge of death valley national parks in the United States. "Water basin" has discovered a new kind of magnetotactic bacteria, and the new bacteria breathe with sulphate compounds, which can not only produce crystals of magnetite minerals, but also produce sulphidic complex mineral crystals. It has important application value in biotechnology and nanotechnology. Related papers were published in the recently published "Science" magazine.

The Badwater Basin is located on the edge of the Death Valley National Park on the border of California and Nevada. Researchers collect water samples from the area daily to find microorganisms with different magnetic properties. They called the new bacteria they discovered as BW-1. In the video they shot, BW-1 bacteria were swimming along the direction of the magnetic field. Magnetotactic bacteria is a unicellular microorganism that is found in almost all water bodies. As the bacteria produce magnetite or sulphiderite that forms nanocrystals, they move toward the magnetic field and follow the direction of the magnetic field, like a miniature compass that can swim. This magnetic crystallization allows bacteria and their internal crystalline magnetosomes to have important value in drug delivery and medical imaging.

After isolation and cultivation and DNA analysis, the researchers found that BW-1 bacteria had two sets of magnetosome genes, which are different from other magnetotactic bacteria. Other magnetotactic bacteria have only a set of magnetosomal genes and can only produce one type of magnetosomes. Minerals. Dennis Bezlinski of the University of Nevada, Las Vegas, explained that this finding shows that BW-1 can produce magnetite and sulfur complex iron may be controlled by the two sets of genes, representing a A new, previously unknown group of sulfate-reducing bacteria that “breathe” with sulphate compounds, and most organic organisms use oxygen to breathe. This is very important for mass production of any of the two minerals.

“Sulfaurite is an iron sulfide, because it is slightly different from the magnetite formed by iron oxide in terms of physical properties and magnetic properties, so it is superior to magnetite in some applications.” Betsinski said At present, the laboratory can only produce a variety of bacteria that produce magnetite crystals, and this is the first time it has been found that it can produce sulfur complex iron ore. “Before, scientists had never isolated bacteria that could produce sulphur complexite, nor had they tested their crystallization in biomedical and other applications.”

Enriqueta Baria, project manager of the US National Science Foundation’s Division of Earth Sciences, said that the significance of the discovery is that the bacteria contain special genes that can synthesize magnetite and sulphur complexes, and they are magnetic. The composition of the body varies with the chemical composition of the environment. (Chang Lijun)

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