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Tuesday, April 21, 2020

Isolation, cloning and characterization of an azoreductase and the effect of salinity on its expression in a halophilic bacterium.

Understanding the molecular mechanisms of azo dye decolorization is important for the development of effective bioremediation for textile-colored wastewater. A halophilic bacterium Halomonas sp. strain GT was isolated, which could degrade the azo dye Acid Brilliant Scarlet GR at 10% NaCl. The complete genome sequence of this strain was obtained using the PacBio RS II platform. Genome annotation revealed that four proteins are related to decolorization of azo dyes, such as azoreductase, laccases, benzene 1,2-dioxygenase, and catechol 1,2-dioxygenase. The putative azoreductase gene of Halomonas sp. strain GT responsible for the decolorization of azo dye in high salt environment was isolated.…

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Tuesday, April 21, 2020

The complete genome sequence of Thalassospira indica PB8BT insights into adaptation to the marine environment

Thalassospira indica PB8BT was isolated from the deep water of the Indian Ocean. Here we report the complete genome sequence of type strain PB8BT, which comprises 4,701,725?bp with a G?+?C content of 54.9?mol%. We found that numerous genes related to iron acquisition, resistance, motility and chemotaxis, nitrogen, phosphorus and sulfur metabolism, and stress response. These metabolic features and related genes revealed genetic basis for the adaptation to the marine environment. The genome of T. indica PB8BT will be helpful for further insights into its adaptive evolution and ecological role in marine environment.

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Sunday, September 22, 2019

Bacterial microbiota and metabolic character of traditional sour cream and butter in Buryatia, Russia.

Traditional sour cream and butter are widely popular fermented dairy products in Russia for their flavor and nutrition, and contain rich microbial biodiversity, particularly in terms of lactic acid bacteria (LAB). However, few studies have described the microbial communities and metabolic character of traditional sour cream and butter. The objective of this study was to determine the bacterial microbiota and metabolic character of eight samples collected from herdsmen in Buryatia, Russia. Using single-molecule real-time (SMRT) sequencing techniques, we identified a total of 294 species and/or subspecies in 169 bacterial genera, belonging to 14 phyla. The dominant phylum was Firmicutes (81.47%)…

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Sunday, September 22, 2019

Complete genome sequencing of Lactobacillus plantarum ZLP001, a potential probiotic that enhances intestinal epithelial barrier function and defense against pathogens in pigs.

The mammalian gastrointestinal tract is a heterogeneous ecosystem with the most abundant, and one of the most diverse, microbial communities. The gut microbiota, which may contain more than 100 times the number of genes in the human genome, endows the host with beneficial functional features, including colonization resistance, nutrient metabolism, and immune tolerance (Bäckhed, 2005). Dysbiosis of gut microbiota may result in serious adverse consequences for the host, such as neurological disorders, cancer, obesity, malnutrition, inflammatory dysregulation, and susceptibility to pathogens

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Sunday, July 7, 2019

Aestuarium zhoushanense gen. nov., sp. nov., Isolated from the Tidal Flat.

A gram-stain-negative, aerobic, ovoid or short rod-shaped, and non-motile strain, designed G7T was isolated from a tidal flat sample collected from the coast of East Sea in Zhoushan, China. Strain G7T grew at 4-40 °C and pH 6.0-9.0 (optimum, 28 °C and pH 7.5) and with 0-7% (w/v) NaCl (optimum, 1%). The predominant respiratory quinone was Q-10 and the major fatty acids (>10%) identified were C18:1 ?7c, C16:0 and summed feature 3 (C16:1 ?7c and/or C16:1 ?6c). The polar lipids of strain G7T consisted of phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, and four unidentified lipids. The genomic DNA G+C content was 56.7 mol%. Phylogenetic analysis based…

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Sunday, July 7, 2019

The pelagic bacterium Paraphotobacterium marinum has the smallest complete genome within the family Vibrionaceae.

Members of the family Vibrionaceae are metabolically versatile and ubiquitous in natural environments, with extraordinary genome feature of two chromosomes. Here we reported the complete genome of Paraphotobacterium marinum NSCS20N07D(T), a recently described novel genus-level species in the family Vibrionaceae. It contained two circular chromosomes with a size of 2,593,992 bp with G+C content of 31.2 mol%, and a plasmid with a size of 5,539 bp. The larger chromosome (Chr. I) had a genome size of 1,426,504 bp with G+C content of 31.6 mol%, and the smaller one (Chr. II) had a genome size of 1,161,949 bp with G+C content…

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Sunday, July 7, 2019

Genomics and biochemistry investigation on the metabolic pathway of milled wood and alkali lignin-derived aromatic metabolites of Comamonas serinivorans SP-35.

The efficient depolymerization and utilization of lignin are one of the most important goals for the renewable use of lignocelluloses. The degradation and complete mineralization of lignin by bacteria represent a key step for carbon recycling in land ecosystems as well. However, many aspects of this process remain unclear, for example, the complex network of metabolic pathways involved in the degradation of lignin and the catabolic pathway of intermediate aromatic metabolites. To address these subjects, we characterized the deconstruction and mineralization of lignin with milled wood lignin (MWL, the most representative molecule of lignin in its native state) and alkali…

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