Whalers Bay (WB), Deception Island, is an environment that can drastically change its temperature within a few meters. The main forms of life inhabiting this environment are microorganisms, which, due to the high diversity and their adaptive potential, can survive and thrive under harsh stress conditions. However, the genetic potential and mechanisms to cope with fluctuating adverse conditions as well as what extent environmental variations shape the microbial community over the years it is still unknown in Antarctic environments. In this work, sediments collected in a transect in Whalers Bay, Deception Island, during the Austral Summers of 2014, 2015 and 2017 were analyzed using shotgun metagenomics. Sequence data were further processed with the SqueezeMeta tool for assembly, gene prediction, mapping, taxonomic and functional annotations. Results showed that stress-related functions had the influence of temperatures and solar radiation observed in the years of 2015 and 2017. The most differentiated functions were the ones related to oxidative stress, comparing 2014 vs 2015 and 2014 vs 2017. The genes coding for HSP20 and oxidoreductases (nrdH, grxA, korC and korD), as well as the genes clpE, cspL, and operons mtrAB and vicKR, were differentially enriched between the years, most of them found in gram-positive bacteria. The selective pressures of temperature and radiation may have favored the growth of gram-positive bacteria in 2017, with emphasis on Arthrobacter genus. Data gathered in this work showed that temperature and solar radiation could potentially be the primary driving forces shaping the repertoire of stress-response genes for the maintenance of microbial diversity in WB Antarctic sediments.
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http://dx.doi.org/10.1016/j.scitotenv.2020.143671 | DOI Listing |
Mar Drugs
December 2024
Consiglio Nazionale delle Ricerche (CNR), Istituto di Chimica Biomolecolare (ICB), Via Campi Flegrei 34, 80078 Pozzuoli, Napoli, Italy.
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View Article and Find Full Text PDFInfluencers are content creators who post online about their lives and can amass a significant following. Influencers can be dangerous by negatively affecting their followers' body image and marketing products in a deceptive way. The limited academic writings which consider influencer regulation note an incongruency between influencer conduct and the corresponding regulatory system.
View Article and Find Full Text PDFPolicy Polit Nurs Pract
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Division of Nursing Science, School of Nursing, Rutgers University, Newark, NJ, USA.
This article presents a historical analysis of the Sentosa nurses, a group of nurses recruited from the Philippines in 2005 and 2006 to work in a health-care facility on Long Island, New York. The international nurse recruitment company that hired them underpaid them, assigned them to work in unsafe conditions with low nurse-to-patient ratios, and breached other parts of their contracts with the nurses. When the nurses decided to resign and break from their contracts early, the recruitment company retaliated, initiating civil, administrative, and criminal charges against the nurses.
View Article and Find Full Text PDFWorld J Microbiol Biotechnol
October 2024
Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
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View Article and Find Full Text PDFBMC Public Health
September 2024
Department of Experimental Psychology, University of Duesseldorf, Duesseldorf, Germany.
Background: Survey studies in medical and health sciences predominantly apply a conventional direct questioning (DQ) format to gather private and highly personal information. If the topic under investigation is sensitive or even stigmatizing, such as COVID-19-related health behaviors and adherence to non-pharmaceutical interventions in general, DQ surveys can lead to nonresponse and untruthful answers due to the influence of social desirability bias (SDB). These effects seriously threaten the validity of the results obtained, potentially leading to distorted prevalence estimates for behaviors for which the prevalence in the population is unknown.
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