A biofilm and organomineralisation model for the growth and limiting size of ooids

Batchelor, Murray T.; Burne, Robert V.; Henry, Bryan R.; Li, Fei; Paul, Josef

doi:10.1038/s41598-017-18908-4

Cited by 29 publications

(27 citation statements)

References 34 publications

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“…The results showed that these dark micrites do not have an obvious regular mineral crystal structure (Figure 5a). Their complex and irregular ultrastructural features are similar to those of ACC reported in modern ooid research (Batchelor et al, 2018; Diaz et al, 2013, 2015, 2017; Edgcomb et al, 2013; O'Reilly et al, 2017; Summons et al, 2013). In the observation of these dark micrites, nanospheres, extracellular polymeric substance (EPS) calcified remnants and a considerable number of exquisite microbial fossils can be found.…”

Section: Resultssupporting

confidence: 79%

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

et al. 2021

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The Cambrian Miaolingian Series strata at the Kouquan section, North China, are primarily divided into the Xuzhuang, Zhangxia, and Gushan formations. This particular series comprises oolitic limestone in the middle to upper intervals. Thin section observations of carbonate rock samples from the Zhangxia Formation show that the well‐preserved and most remarkable grains among them are cerebroid ooids. Although these ooids have characteristic serrated margins, they are distinct from ooids reported in previous publications due to inconspicuous concentric laminae and radial structures composed of micrite and microspar. To understand the origin of these ooids, we employed petrographic examination, X‐ray diffraction (XRD), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and isotope analyses to explore their compositions and conditions of development. In addition, the occurrence of these cerebroid ooids is closely related to that of dark‐coloured micrite: most cerebroid ooids and quasi‐cerebroid ooids float inside dark micrite; dark micrite appears in the interior of cerebroid ooids as a radial micrite structure. EPMA and energy‐dispersive X‐ray (EDX) spectroscopy analyses of micrite reveal that the dark micrite consists of lithomicrobial mats. Fine‐scale characterization of the dark micrite inside these cerebroid ooids shows the presence of filamentous and bowl‐shaped calcified microbial fossils and extracellular polymeric substance (EPS) calcified remnants. Isotopic data indicate a variation of δ13C isotopic values between −4.92‰ and −0.11‰ (VPDB) and −9.89‰ and −4.93‰ for δ18O values (VPDB). The negative values of δ13C in the studied ooid suggest the genesis of carbon from the high organic‐rich zone such as the microbial zone. Also, the 13C‐depleted carbon values in the ooids advocate that the carbon is mainly derived from organic sources associated with the sulphate reduction bacterial activity. Thus, isotopic data of this study also provide consistent clues in favour of microbial participation during the genesis of cerebroid ooids. In conclusion, our new findings strongly confirm that the cerebroid ooids of the North China Platform are genetically related to microbial processes.

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Section: Resultssupporting

confidence: 79%

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

et al. 2021

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“…The mineralogy and the stable C and O isotope signatures of carbonate in modern marine ooids also suggest that these grains record the composition of surface seawater [3,7]. Therefore, models of ooid formation either assume that microbial processes do not substantially contribute to ooid growth [8,9], or that microbial processes are responsible for the production of most ooid carbonate [10,11].…”

Section: Introductionmentioning

confidence: 99%

Contribution of Benthic Processes to the Growth of Ooids on a Low-Energy Shore in Cat Island, The Bahamas

et al. 2018

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Ooids are typically found in frequently reworked coastal sediments, and are thought to accrete by inorganic chemical precipitation around moving grains. The high organic content and the presence of biosignatures, however, suggest that ooids interact with benthic microbial communities. Here, we investigate the role of benthic processes on ooid growth on a leeward shore of Cat Island, The Bahamas. Polished ooids are present in the surf zone, whereas dull ooids and grapestones are present in microbially colonized sediments seaward of the surf zone. Wave hydrodynamics and sediment transport modeling suggest that microbially colonized sediments are mobilized at monthly time scales. We propose a new conceptual model for both ooids and grapestone. Ooids rest and accrete in the area covered by microbial mats, but are periodically transported to the surf zone where wave abrasion polishes them within days. Ooids are then transported back to microbially colonized areas where the accretion cycle resumes. Ooids too large to be transported become trapped outside the surf zone, exit the "conveyor belt" and become grapestones. The benthic growth mechanism predicts petrographic characteristics that match observations: successive ooid laminae do not thin outward, laminae exhibit irregularities, and some ooids include multiple nuclei.

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“…Biofilms can also be simulated by continuum multiphase flow modeling ( Albero et al , 2014 ; Batchelor et al , 2018 ; Cogan and Keener, 2004 ; Horn and Lackner, 2014 ; Picioreanu et al , 2004 ; Rittmann, 1982 ; Taylor and Jaffe, 1990 ; Winstanley et al , 2011 ; Zhang et al , 2008 ). Bacterial biofilms may be modeled as a polymer solution immersed in a Newtonian liquid.…”

Section: Biofilm Formationmentioning

confidence: 99%

Bacterial biomechanics—From individual behaviors to biofilm and the gut flora

Ishikawa

Omori

2020

APL Bioengineering

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Bacteria inhabit a variety of locations and play important roles in the environment and health. Our understanding of bacterial biomechanics has improved markedly in the last decade and has revealed that biomechanics play a significant role in microbial biology. The obtained knowledge has enabled investigation of complex phenomena, such as biofilm formation and the dynamics of the gut flora. A bottom-up strategy, i.e., from the cellular to the macroscale, facilitates understanding of macroscopic bacterial phenomena. In this Review, we first cover the biomechanics of individual bacteria in the bulk liquid and on surfaces as the base of complex phenomena. The collective behaviors of bacteria in simple environments are next introduced. We then introduce recent advances in biofilm biomechanics, in which adhesion force and the flow environment play crucial roles. We also review transport phenomena in the intestine and the dynamics of the gut flora, focusing on that in zebrafish. Finally, we provide an overview of the future prospects for the field.

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A biofilm and organomineralisation model for the growth and limiting size of ooids

Cited by 29 publications

References 34 publications

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

Contribution of Benthic Processes to the Growth of Ooids on a Low-Energy Shore in Cat Island, The Bahamas

Bacterial biomechanics—From individual behaviors to biofilm and the gut flora

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