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Arias D, Saldaña M, Botero YL, Dinamarca F, Paredes B, Salazar-Ardiles C, Andrade DC, Cisternas LA, Carrasco J, Santos C, Dorador C, Gómez-Silva B. Exploring the potential of the halotolerant bacterial strain Bacillus subtilis LN8B as an ecofriendly sulfide collector for seawater flotation. J Appl Microbiol 2024; 135:lxad313. [PMID: 38126104 DOI: 10.1093/jambio/lxad313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/12/2023] [Accepted: 12/19/2023] [Indexed: 12/23/2023]
Abstract
AIM To assess the effectiveness of Bacillus subtilis strain LN8B as a biocollector for recovering pyrite (Py) and chalcopyrite (CPy) in both seawater (Sw) and deionized water (Dw), and to explore the underlying adhesion mechanism in these bioflotation experiments. MATERIALS AND METHODS The bioflotation test utilized B. subtilis strain LN8B as the biocollector through microflotation experiments. Additionally, frother methyl isobutyl carbinol (MIBC) and conventional collector potassium amyl xanthate (PAX) were introduced in some experiments. The zeta potential (ZP) and Fourier-transform infrared spectroscopy (FTIR) was employed to explore the adhesion mechanism of Py and CPy interacting with the biocollector in Sw and Dw. The adaptability of the B. subtilis strain to different water types and salinities was assessed through growth curves measuring optical density. Finally, antibiotic susceptibility tests were conducted to evaluate potential risks of the biocollector. RESULTS Superior outcomes were observed in Sw where Py and CPy recovery was ∼39.3% ± 7.7% and 41.1% ± 5.8%, respectively, without microorganisms' presence. However, B. subtilis LN8B potentiate Py and CPy recovery, reaching 72.8% ± 4.9% and 84.6% ± 1.5%, respectively. When MIBC was added, only the Py recovery was improved (89.4% ± 3.6%), depicting an adverse effect for CPy (81.8% ± 1.1%). ZP measurements indicated increased mineral surface hydrophobicity when Py and CPy interacted with the biocollector in both Sw and Dw. FTIR revealed the presence of protein-related amide peaks, highlighting the hydrophobic nature of the bacterium. The adaptability of this strain to diverse water types and salinities was assessed, demonstrating remarkable growth versatility. Antibiotic susceptibility tests indicated that B. subtilis LN8B was susceptible to 23 of the 25 antibiotics examined, suggesting it poses minimal environmental risks. CONCLUSIONS The study substantiates the biotechnological promise of B. subtilis strain LN8B as an efficient sulfide collector for promoting cleaner mineral production. This effectiveness is attributed to its ability to induce mineral surface hydrophobicity, a result of the distinct characteristics of proteins within its cell wall.
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Affiliation(s)
- Dayana Arias
- Laboratory of Molecular Biology and Applied Microbiology, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Manuel Saldaña
- Faculty of Engineering and Architecture, Arturo Prat University, Iquique 1110939, Chile
| | - Yesica L Botero
- Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Francisco Dinamarca
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Bernardo Paredes
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Camila Salazar-Ardiles
- Laboratory of Molecular Biology and Applied Microbiology, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - David C Andrade
- Exercise Applied Physiology Laboratory, Research Center in High Altitude Medicine and Physiology, Biomedical Department, Faculty of Health Science, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Luis A Cisternas
- Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Jorge Carrasco
- Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Carlos Santos
- Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Cristina Dorador
- Department of Biotechnology, Faculty of Marine Sciences and Biological Resources and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
| | - Benito Gómez-Silva
- Biochemistry Lab., Biomedical Dept., Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile
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Salazar-Ardiles C, Pérez-Arancibia A, Asserella-Rebollo L, Gómez-Silva B. Presence of Free-living Acanthamoeba in Loa and Salado Rivers, Atacama Desert, Northern Chile. Microorganisms 2022; 10:microorganisms10122315. [PMID: 36557568 PMCID: PMC9784158 DOI: 10.3390/microorganisms10122315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/14/2022] [Accepted: 11/21/2022] [Indexed: 11/24/2022] Open
Abstract
Substantial knowledge has accumulated on the microbiome of the hyperarid Atacama Desert during the last two decades; however, information on Atacama free-living amoebae (FLA) is limited and increasing efforts are required. FLA are polyphyletic heterotrophic naked or testate protists that feed on organic matter, fungi, protozoa, and bacteria and may disseminate infections. Amoebae in Chile are represented by 416 taxa and 64 genera, and 29 taxa have been identified in arid shrub lands at the southern limit of the Atacama Desert, and Acanthamoeba are present in all the country's regions. To expand our knowledge and to contribute to the biogeographic distribution of Atacama FLA, we report the dominant presence of members of the genus Acanthamoeba in water and sediment sampled at the Loa and Salado rivers in the pre-Andean zone of the Antofagasta Region, northern Chile, at sites 2500 m above sea level. We expect these observations and preliminary evidence of FLA presence in other wetlands (Chiuchiu, Tebenquiche) in this region to be incentive for further exploration of Atacama amoebae.
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Affiliation(s)
- Camila Salazar-Ardiles
- Departamento Tecnología Médica, Health Sciences Faculty, Universidad de Antofagasta, Antofagasta 1270300, Chile
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty, Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile
| | - Alexander Pérez-Arancibia
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty, Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile
| | - Leyla Asserella-Rebollo
- Escuela de Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Santo Tomas 083067, Chile
| | - Benito Gómez-Silva
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty, Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile
- Correspondence:
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Andrade DC, Gómez-Silva B, Batista-García RA, Millet GP. Editorial: Adaptive response of living beings to extreme environments: Integrative approaches from cellular and molecular biology, biotechnology, microbiology to physiology. Front Physiol 2022; 13:1068287. [DOI: 10.3389/fphys.2022.1068287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 10/18/2022] [Indexed: 11/06/2022] Open
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Marín C, Rubio J, Godoy R. Chilean blind spots in soil biodiversity and ecosystem function research. AUSTRAL ECOL 2022. [DOI: 10.1111/aec.13232] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- César Marín
- Centro de Investigación e Innovación para el Cambio Climático (CiiCC) Universidad Santo Tomás Av. Ramón Picarte 1130 5090000 Valdivia Chile
| | - Javiera Rubio
- Escuela de Geografía, Facultad de Ciencias Universidad Austral de Chile Valdivia Chile
| | - Roberto Godoy
- Instituto Ciencias Ambientales y Evolutivas, Facultad de Ciencias Universidad Austral de Chile Valdivia Chile
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Vilo C, Dong Q, Galetovic A, Gómez-Silva B. Metagenome-Assembled Genome of Cyanocohniella sp. LLY from the Cyanosphere of Llayta, an Edible Andean Cyanobacterial Macrocolony. Microorganisms 2022; 10:1517. [PMID: 35893575 PMCID: PMC9332814 DOI: 10.3390/microorganisms10081517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/15/2022] [Accepted: 07/22/2022] [Indexed: 02/04/2023] Open
Abstract
Cyanobacterial macrocolonies known as Llayta are found in Andean wetlands and have been consumed since pre-Columbian times in South America. Macrocolonies of filamentous cyanobacteria are niches for colonization by other microorganisms. However, the microbiome of edible Llayta has not been explored. Based on a culture-independent approach, we report the presence, identification, and metagenomic genome reconstruction of Cyanocohniella sp. LLY associated to Llayta trichomes. The assembled genome of strain LLY is now available for further inquiries and may be instrumental for taxonomic advances concerning this genus. All known members of the Cyanocohniella genus have been isolated from salty European habitats. A biogeographic gap for the Cyanocohniella genus is partially filled by the existence of strain LLY in Andes Mountains wetlands in South America as a new habitat. This is the first genome available for members of this genus. Genes involved in primary and secondary metabolism are described, providing new insights regarding the putative metabolic capabilities of Cyanocohniella sp. LLY.
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Affiliation(s)
- Claudia Vilo
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile; (C.V.); (A.G.)
| | - Qunfeng Dong
- Center for Biomedical Informatics, Department of Medicine, Stritch School of Medicine, Loyola University of Chicago, Chicago, IL 60660, USA;
| | - Alexandra Galetovic
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile; (C.V.); (A.G.)
| | - Benito Gómez-Silva
- Laboratory of Biochemistry, Biomedical Department, Health Sciences Faculty and Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta 1270300, Chile; (C.V.); (A.G.)
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