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New Microbes and New Infections May 2017We report the main characteristics of P3515 sp. nov., P3516 sp. nov., P2481 sp. nov., P3554 sp. nov., P3089 sp. nov., P3587 sp. nov., P3532 sp. nov., P3469 sp....
Description of sp. nov., sp. nov., sp. nov., sp. nov., sp. nov., sp. nov., sp. nov., sp. nov. and sp. nov., nine halophilic new species isolated from human stool.
We report the main characteristics of P3515 sp. nov., P3516 sp. nov., P2481 sp. nov., P3554 sp. nov., P3089 sp. nov., P3587 sp. nov., P3532 sp. nov., P3469 sp. nov. and P3610 sp. nov., that were isolated in 2016 from salty stool samples (≥1.7% NaCl) from healthy Senegalese living at Dielmo and N'diop, two villages in Senegal.
PubMed: 28280541
DOI: 10.1016/j.nmni.2017.01.010 -
Indian Journal of Microbiology Dec 2016Mangroves are unique ecosystems in the coastal tropical and subtropical regions of the Earth. The fluctuation in salinity due to tidal action results in a prolific...
Mangroves are unique ecosystems in the coastal tropical and subtropical regions of the Earth. The fluctuation in salinity due to tidal action results in a prolific population of adhered halophilic and halotolerant bacteria in this ecosystem. In this study, a pigment producing adhered bacterial strain MXM-16 was isolated from mangrove plant litter of Goa. This strain was moderately halophilic, Gram positive rod, catalase positive and capable of utilizing sodium benzoate as a source of carbon. , produced a siderophore that was hydroxamate in nature. The non-diffusible yellow pigment was a carotenoid and HPLC studies revealed a peak that was indicative of astaxanthin as one of the component. Further studies on the pigment exhibited its ability to chelate iron from the chrome azurol sulphonate medium behaving as an additional mechanism for iron acquisition.
PubMed: 27784943
DOI: 10.1007/s12088-016-0591-7 -
Genome Announcements Jun 2016Halobacillus sp. strain KGW1 is a moderately halophilic, rod shaped, Gram-positive, yellow pigmented, alkaline protease-producing bacterium isolated from a water sample...
Draft Genome Sequence of Halobacillus sp. Strain KGW1, a Moderately Halophilic and Alkaline Protease-Producing Bacterium Isolated from the Rhizospheric Region of Phragmites karka from Chilika Lake, Odisha, India.
Halobacillus sp. strain KGW1 is a moderately halophilic, rod shaped, Gram-positive, yellow pigmented, alkaline protease-producing bacterium isolated from a water sample from Chilika Lake, Odisha, India. Sequencing of bacterial DNA assembled a 3.68-Mb draft genome. The genome annotation analysis showed various gene clusters for tolerance to stress, such as elevated pH, salt concentration, and toxic metals.
PubMed: 27365341
DOI: 10.1128/genomeA.00361-16 -
Acta Biochimica Polonica 2016Historic buildings are constantly being exposed to numerous climatic changes such as damp and rainwater. Water migration into and out of the material's pores can lead to...
Historic buildings are constantly being exposed to numerous climatic changes such as damp and rainwater. Water migration into and out of the material's pores can lead to salt precipitation and the so-called efflorescence. The structure of the material may be seriously threatened by salt crystallization. A huge pressure is produced when salt hydrates occupy larger spaces, which leads at the end to cracking, detachment and material loss. Halophilic microorganisms have the ability to adapt to high salinity because of the mechanisms of inorganic salt (KCl or NaCl) accumulation in their cells at concentrations isotonic to the environment, or compatible solutes uptake or synthesis. In this study, we focused our attention on the determination of optimal growth conditions of halophilic microorganisms isolated from historical buildings in terms of salinity, pH and temperature ranges, as well as biochemical properties and antagonistic abilities. Halophilic microorganisms studied in this paper could be categorized as a halotolerant group, as they grow in the absence of NaCl, as well as tolerate higher salt concentrations (Staphylococcus succinus, Virgibacillus halodenitrificans). Halophilic microorganisms have been also observed (Halobacillus styriensis, H. hunanensis, H. naozhouensis, H. litoralis, Marinococcus halophilus and yeast Sterigmatomyces halophilus). With respect to their physiological characteristics, cultivation at a temperature of 25-30°C, pH 6-7, NaCl concentration for halotolerant and halophilic microorganisms, 0-10% and 15-30%, respectively, provides the most convenient conditions. Halophiles described in this study displayed lipolytic, glycolytic and proteolytic activities. Staphylococcus succinus and Marinococcus halophilus showed strong antagonistic potential towards bacteria from the Bacillus genus, while Halobacillus litoralis displayed an inhibiting ability against other halophiles.
Topics: Antibiosis; Bacillus; Construction Materials; Environmental Microbiology; Halobacteriales; Hydrogen-Ion Concentration; Staphylococcus
PubMed: 26894235
DOI: 10.18388/abp.2015_1171 -
BMC Microbiology Oct 2015Biosurfactants are surface-active biomolecules with great applicability in the food, pharmaceutical and oil industries. Endospore-forming bacteria, which survive for...
BACKGROUND
Biosurfactants are surface-active biomolecules with great applicability in the food, pharmaceutical and oil industries. Endospore-forming bacteria, which survive for long periods in harsh environments, are described as biosurfactant producers. Although the ubiquity of endospore-forming bacteria in saline and hypersaline environments is well known, studies on the diversity of the endospore-forming and biosurfactant-producing bacterial genera/species in these habitats are underrepresented.
METHODS
In this study, the structure of endospore-forming bacterial communities in sediment/mud samples from Vermelha Lagoon, Massambaba, Dois Rios and Abraão Beaches (saline environments), as well as the Praia Seca salterns (hypersaline environments) was determined via denaturing gradient gel electrophoresis. Bacterial strains were isolated from these environmental samples and further identified using 16S rRNA gene sequencing. Strains presenting emulsification values higher than 30 % were grouped via BOX-PCR, and the culture supernatants of representative strains were subjected to high temperatures and to the presence of up to 20 % NaCl to test their emulsifying activities in these extreme conditions. Mass spectrometry analysis was used to demonstrate the presence of surfactin.
RESULTS
A diverse endospore-forming bacterial community was observed in all environments. The 110 bacterial strains isolated from these environmental samples were molecularly identified as belonging to the genera Bacillus, Thalassobacillus, Halobacillus, Paenibacillus, Fictibacillus and Paenisporosarcina. Fifty-two strains showed emulsification values of at least 30%, and they were grouped into 18 BOX groups. The stability of the emulsification values varied when the culture supernatants of representative strains were subjected to high temperatures and to the presence of up to 20% NaCl. The presence of surfactin was demonstrated in one of the most promising strains.
CONCLUSION
The environments studied can harbor endospore-forming bacteria capable of producing biosurfactants with biotechnological applications. Various endospore-forming bacterial genera/species are presented for the first time as biosurfactant producers.
Topics: Bacteria, Aerobic; Brazil; Cluster Analysis; DNA, Bacterial; DNA, Ribosomal; Endospore-Forming Bacteria; Environmental Microbiology; Mass Spectrometry; Molecular Sequence Data; Phylogeny; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Sodium Chloride; Surface-Active Agents
PubMed: 26511622
DOI: 10.1186/s12866-015-0575-5 -
Biotechnology Reports (Amsterdam,... Dec 2015A marine ascidian-associated bacterium, RSK CAS9, was optimized for lipase production by response surface methodology using marine waste as substrate. The central...
A marine ascidian-associated bacterium, RSK CAS9, was optimized for lipase production by response surface methodology using marine waste as substrate. The central composite design was employed, and the optimal medium constituents for maximum lipase production (1355.81 U/ml) were determined to be tuna powder (14.58 g/l), olive oil (5.05 ml/l); NaCl (72.42 g/l), temperature (45 °C) and pH 9.0. An alkaline lipase was purified to 8.46 fold with 1193.59 U mg specific activities with the molecular weight of 44 kDa. The activity was substantially inhibited by EDTA and PMSF, indicating that it was a metalloenzyme serine residue which was essential for catalytic activity. Thus, lipase production by microbial conversion of marine fish wastes in this study suggested its potential utilization for the production of high value products.
PubMed: 28352574
DOI: 10.1016/j.btre.2015.09.002 -
Polish Journal of Microbiology 2015A combination of culture-dependent and culture-independent approaches was employed to identify the bacterial diversity of Çamalti solar saltern in Turkey. The bacterial...
A combination of culture-dependent and culture-independent approaches was employed to identify the bacterial diversity of Çamalti solar saltern in Turkey. The bacterial communities of Çamalti Saltern were analyzed by molecular techniques that included denaturing gradient gel electrophoresis of 16S rRNA gene fragments PCR amplified from DNA extracted from the water samples of the saltern and 16S rRNA gene library analysis. A total of 42 isolates were identified at the genus/species level and 17 of them were found to belong to the Bacteria domain. All bacterial isolates were phylogenetically related to Halobacillus, Virgibacillus and Halomonas genus. A total of 50 clones from 16S rRNA gene library were analyzed by ARDRA. 16S rRNA sequence analysisof these clones revealed that most (85%) of the bacterial clones were related to Salinibacter genus members of the Bacteroidetes. The sequences of DGGE bands were related to the uncultured Salinibacter, uncultured halophilic bacterium and Halomonas sp. This work highlights the halophilic bacterial diversity of Çamalti marine solar saltern.
Topics: Biodiversity; Chemical Industry; DNA Fingerprinting; DNA, Bacterial; Denaturing Gradient Gel Electrophoresis; Halobacteriaceae; Nucleic Acid Amplification Techniques; Phylogeny; Sodium Chloride; Turkey
PubMed: 26094314
DOI: No ID Found -
SpringerPlus 2015Five halophilic bacterial isolates namely SS1, SS2, SS3, SS5 and SS8 were isolated from soil sediments of Lunsu, a salty water body. All the bacterial isolates showed...
Five halophilic bacterial isolates namely SS1, SS2, SS3, SS5 and SS8 were isolated from soil sediments of Lunsu, a salty water body. All the bacterial isolates showed growth in LB medium containing up to 8.7% NaCl, pH 7-8 and at temperature range of 30-37°C. The bacterial isolates SS1 and SS3 require at least 3.8% NaCl for their growth, indicating their strict halophilic nature. Interestingly, bacterial isolates SS2, SS5 and SS8 but not SS1 and SS3 exhibited growth in medium supplemented with KCl. Accordingly, Na(+) and K(+) ions were detected at 1.39 and 0.0035%, respectively in Lunsu water. All the bacterial isolates were analyzed by random amplification of polymorphic DNA (RAPD) using four different random primers and produced PCR fragments ranging from 0.1 to 5 kb in size. Phylogenetic tree based on RAPD finger prints showed that SS1 and SS3 formed one group, while SS2 and SS5 formed the second group, whereas SS8 was out group. Sequence analysis of 16S rDNA identified SS1 and SS3 as Halobacillus trueperi, SS2 as Shewanella algae, SS5 as Halomonas venusta, and SS8 as Marinomonas sp. were deposited in GenBank with accession numbers of KM260166, KF751761, KF751760, KF751762 and KF751763, respectively. This is the first report on the presence of diverse halophilic bacteria in the foot hills of Himalayas.
PubMed: 26090321
DOI: 10.1186/s40064-015-1028-1