Role of Natural Flocculation in Eliminating Toxic Metals

Heidari, Mehdi

doi:10.1007/s00244-019-00597-x

Cited by 13 publications

(3 citation statements)

References 70 publications

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“…Alguns autores demonstraram que a fl oculação da matéria orgânica dissolvida em ambientes estuarinos pode aumentar a sedimentação de complexos de metais orgânicos derivados de ecossistemas terrestres (Sholkovitz, 1978;Sholkovitz et al, 1978;Wells et al, 2000;Turner et al, 2002;Stolpe e Hassellöv, 2007;Bia� et al, 2010;Samani et al, 2014;Heidari, 2019). Como visto na Figura 3, os dados de concentração total de metais-traço revelaram dois padrões de distribuição.…”

Section: Resultsunclassified

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Delgado

Lima

Vieira

et al. 2023

S&G

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As variações da coluna d'água no ambiente aquático, motivadas por processos naturais ou antropogênicos, podem afetar a estabilidade de metais-traço no sedimento do Complexo Portuário de Santos (CPS), localizado no sudeste do Brasil. Metais-traço, como Cu, Zn, Ni, Pb e Cd, podem afetar negativamente os compartimentos ecológicos e biológicos da água estuarina. Para avaliar a condição do sedimento do CPS, este artigo investigou a fração geoquímica de metais-traço sedimentares aplicando a abordagem de extração sequencial BCR (European Community Bureau of Reference - Gabinete de Referência da Comunidade Europeia). A matéria orgânica e o tamanho de grão fino, característicos de um ambiente estuarino, mostraram uma influência direta na dinâmica de concentração de metais-traço em sedimentos, especialmente para Pb, Cd e Ni. No caso específico de Zn e Cu, havia uma possível fonte de contaminação no porto. A maior fração dos metais estudados era não residual, potencialmente mobilizável em um ambiente em que a variação dos parâmetros físico-químicos da coluna d'água é altamente variável, algo frequente em ambientes estuarinos. Palavras-chave: especiação de metais-traço; Porto de Santos; sedimento; impacto ambiental.

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Section: Resultsunclassified

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Delgado

Lima

Vieira

et al. 2023

S&G

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“…If applied to bacterial cells, the bioassembler stimulates a process of autoaggregation resulting in formation of non-attached bacterial aggregates [52]. Bacterial flocculation and autoaggregation within the liquid volume is a process typical for natural aquatic ecosystems, which is used industrially for waste-water treatments and other applications [72][73][74][75][76]. Non-attached aggregates formed by pathogenic bacteria are described in chronic infections [77][78][79][80].…”

Section: Using a Magnetic Force For Cell Integration And Aggregationmentioning

confidence: 99%

Experimentally Created Magnetic Force in Microbiological Space and On-Earth Studies: Perspectives and Restrictions

Sа¹,

Parfenov

Каралкин

et al. 2023

Cells

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Magnetic force and gravity are two fundamental forces affecting all living organisms, including bacteria. On Earth, experimentally created magnetic force can be used to counterbalance gravity and place living organisms in conditions of magnetic levitation. Under conditions of microgravity, magnetic force becomes the only force that moves bacteria, providing an acceleration towards areas of the lowest magnetic field and locking cells in this area. In this review, we consider basic principles and experimental systems used to create a magnetic force strong enough to balance gravity. Further, we describe how magnetic levitation is applied in on-Earth microbiological studies. Next, we consider bacterial behavior under combined conditions of microgravity and magnetic force onboard a spacecraft. At last, we discuss restrictions on applications of magnetic force in microbiological studies and the impact of these restrictions on biotechnological applications under space and on-Earth conditions.

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“…Магнитное поле в этой системе уменьшается к центру рабочего объема, что оказывает эффект на диамагнитные объекты, такие как бактерии, перемещая их в направлении уменьшения поля и обеспечивая концентрацию в центре рабочего объема. В большинстве аналогичных используемых систем магнитной левитации магниты разнесены в пространстве, что определяет альтернативную конфигурацию градиента магнитного поля, которая не собирает клетки в центре объеме, а, напротив, позволяет им разделиться в соответствии с их плавучестью [12]. Биоассемблер включал два специально сконфигурированных постоянных магнита из сплава NdFeB (неодим-железо-бор).…”

Section: обсуждение полученных данныхunclassified

A magnetic levitation-based system to study the mechanisms of bacterial flocculation and autoaggregation

Domnin

Zakharchenko

Rejepov

et al. 2023

Tihookeanskij medicinskij žurnal

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Objective. To evaluate the potential of magnetic levitation systems when studying the autoaggregation of gram-negative and gram-positive pathogenic bacteria and elucidating mechanisms controlling autoaggregation.Materials and methods. Escherichia coli O157:H7, Pseudomonas aeruginosa, Staphylococcus aureus, and Listeria monocytogenes were used. The number of alive bacteria was determined using a Live/Dead® dye. E. coli curli were stained with Congo red.Results. All four tested bacterial species formed autoaggregates that levitated within the liquid volume for up to 72 hours (observation time). After 72 hours, the number of alive bacteria in the autoaggregates ranged from 82% (E. coli) to 99% (L. monocytogenes). The formation of E. coli autoaggregates was shown to depend on the production of curli, which represent surface structures playing an important role in biofilm formation.Conclusion. The proposed system of magnetic levitation can be used to study molecular mechanisms of bacterial autoaggregation and flocculation.

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Role of Natural Flocculation in Eliminating Toxic Metals

Cited by 13 publications

References 70 publications

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Experimentally Created Magnetic Force in Microbiological Space and On-Earth Studies: Perspectives and Restrictions

A magnetic levitation-based system to study the mechanisms of bacterial flocculation and autoaggregation

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