NobleBlocks

Antarctic Sciences

governmentArlington, United States

Research output, citation impact, and the most-cited recent papers from Antarctic Sciences (United States). Aggregated across the NobleBlocks index of 300M+ scholarly works.

Total works
6
Citations
648
h-index
21
i10-index
24
Also known as
Antarctic SciencesOPP Antarctic SciencesOffice of Polar Programs Antarctic SciencesOffice of Polar Programs Antarctic Sciences Section

Top-cited papers from Antarctic Sciences

Biogeochemical and historical drivers of microbial community composition and structure in sediments from Mercer Subglacial Lake, West Antarctica
Christina Davis, Ryan A. Venturelli, Alexander B. Michaud, Jon Hawkings +4 more
2023· ISME Communications29doi:10.1038/s43705-023-00216-w

Ice streams that flow into Ross Ice Shelf are underlain by water-saturated sediments, a dynamic hydrological system, and subglacial lakes that intermittently discharge water downstream across grounding zones of West Antarctic Ice Sheet (WAIS). A 2.06 m composite sediment profile was recently recovered from Mercer Subglacial Lake, a 15 m deep water cavity beneath a 1087 m thick portion of the Mercer Ice Stream. We examined microbial abundances, used 16S rRNA gene amplicon sequencing to assess community structures, and characterized extracellular polymeric substances (EPS) associated with distinct lithologic units in the sediments. Bacterial and archaeal communities in the surficial sediments are more abundant and diverse, with significantly different compositions from those found deeper in the sediment column. The most abundant taxa are related to chemolithoautotrophs capable of oxidizing reduced nitrogen, sulfur, and iron compounds with oxygen, nitrate, or iron. Concentrations of dissolved methane and total organic carbon together with water content in the sediments are the strongest predictors of taxon and community composition. δ¹³C values for EPS (-25 to -30‰) are consistent with the primary source of carbon for biosynthesis originating from legacy marine organic matter. Comparison of communities to those in lake sediments under an adjacent ice stream (Whillans Subglacial Lake) and near its grounding zone provide seminal evidence for a subglacial metacommunity that is biogeochemically and evolutionarily linked through ice sheet dynamics and the transport of microbes, water, and sediments beneath WAIS.

O impacto da prática da automedicação no Brasil: Revisão Sistemática/ The impact of the practice of self-medication in Brazil: Systematic Review
Francisca das Chagas G. Ferreira, Graziela Gomes de Luna, Isabel Cristina M. Izel, Anne Cristine Gomes de Almeida
2021· Brazilian Applied Science Review13doi:10.34115/basrv5n3-016

INTRODUÇÃO: A automedicação exibe potencial de risco nas interações medicamentosas, reações adversas, toxicidade, provocando um diagnóstico incorreto ou tardio, devido ao fármaco mascarar a patologia, resultando em uma resistência ao micro-organismo ou não resolução no quadro clínico dos pacientes.OBJETIVO: Objetivo do estudo é verificar quais os medicamentos mais utilizados na automedicação e analisar quais os fatores que levam a automedicação.MÉTODOS: Os estudos foram pesquisados nas seguintes bases de dados: Scielo (Scientific Electronic Library Online), Pubmed (Biblioteca Nacional de Medicina), Lilacs (Literatura Latina – Americana e do Caribe em ciência da saúde), utilizando as palavras chaves da estratégia de busca para encontrar os artigos. RESULTADOS: Neste estudo a prevalência da automedicação foi vista no público feminino com 64%, com idade acima de 60 anos, seguida por pessoas casadas com 51,6%, com nível escolar fundamental completo 53,8%, possuindo renda de até três salários mínimos 46%. Os medicamentos analgésicos/ antitérmicos representaram 50% do uso, seguido por 35% de anti-inflamatórios não esteroidais, 4% antibacterianos de uso sistêmico e 4% dos medicamentos antigripais. Entre os fatores da automedicação os receituários antigos representam 13% das compras dos medicamentos, seguida por experiência anterior com o medicamento 12%, venda realizada no balcão da farmácia 12%, indicação da família 10% e entre outras causas.CONCLUSÕES: Observou-se que a prática da automedicação na população brasileira teve a influência dos seguintes fatores: prescrição de receituários antigos, experiência do uso do medicamento e recomendações dos balconistas. Medicamentos analgésicos/antitérmicos, antiinflamatórios AINES e antibacterianos de uso sistêmico são os mais utilizados.

Semana de la Unidad en centros de enseñanza
Emilio Jesús Alegre Del Rey
1967doi:10.36576/summa.1301

El sacerdote har notar los momentos justos de te misa en que se pide Ia unidad : colecta Et fmulos, oracin de los fieles, antes del memento de vivos, antes de Ia comunin

Airborne and ground-based geophysical evaluation of the surface and englacial hydrological system of the Sørsdal Glacier, East Antarctica, and implications for ice-shelf stability
Bernd Kulessa, Sarah Thompson, Sue Cook, Glenn Jones +3 more
2021doi:10.5194/egusphere-egu21-14890

<p>Large swathes of the margin of the East Antarctic Ice Sheet experience pronounced surface melting during the austral summer. The nature and temporal evolution of evolving surface hydrological systems are poorly known, however, as are their potential connections with englacial and subglacial water systems and their effects on ice dynamics. We have acquired helicopter-based ground-penetrating radar (GPR), electrical self-potential (SP), broadband passive seismic and GNSS data to delineate the geometry and monitor the temporal evolution of the subsurface hydrological system of the marine-terminating Sørsdal Glacier, Princess Elizabeth Land, East Antarctica, between the austral summers of 2017-18 and 2018-19. Our data reveal the presence of a shallow englacial hydrological system that is connected to surface lakes upstream of the grounding line and, surprisingly, is active not only in the austral summer but also through the Antarctic winter. Here we illustrate the spatial and temporal characteristics of the englacial hydrological system and its susceptibility to tidal forcing through the Antarctic winter. Our observations are consistent with persistent year-round redistribution of mass from grounded to floating portions of at the East Antarctic margin, with far-reaching consequences for ice shelf stability.</p>