Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by concentration

Garcı́a, M. C.; Trujillo, Luis A.; Carmona, J.A. Medina; Muñoz, José; Alfaro, M.C.

doi:10.1016/j.ijbiomac.2018.09.100

Cited by 13 publications

(3 citation statements)

References 22 publications

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“…Chemoheterotrophy has been reported as an essential ecological function of bacterioplankton and sediments ( Zeng et al, 2014 ; He et al, 2020 ). Some scyphomedusa-associated bacteria displayed pollutant degradation including Alteromonas ( Bakunina et al, 2013 ; Lopardo and Urakawa, 2019 ), Sphingomonas ( Walayat et al, 2018 ; Carmen Garcia et al, 2019 ; Menon et al, 2019 ; Yun et al, 2019 ) and Ralstonia ( Wang J. et al, 2020 ). It has been reported that scyphozoans are highly tolerant of certain pollutants (e.g., heavy metals and crude oil), and some of the most toxic PAHs of crude oil can be bioaccumulated in gelatinous zooplankton and potentially be transferred through the food web to contaminate apex predators ( Almeda et al, 2013 ; Lucas and Horton, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Bacterial Communities Associated With Four Blooming Scyphozoan Jellyfish: Potential Species-Specific Consequences for Marine Organisms and Humans Health

Peng

et al. 2021

Front. Microbiol.

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Cnidarians have large surface areas available for colonization by microbial organisms, which serve a multitude of functions in the environment. However, relatively few studies have been conducted on scyphozoan-associated microbial communities. Blooms of scyphozoan species are common worldwide and can have numerous deleterious consequences on the marine ecosystem. Four scyphozoan species, Aurelia coerulea, Cyanea nozakii, Nemopilema nomurai, and Rhopilema esculentum, form large blooms in Chinese seas. In this study, we analyzed the bacterial communities associated with these four jellyfish based on 16S rRNA gene sequencing. We found that the bacterial communities associated with each scyphozoan species were significantly different from each other and from those of the surrounding seawater. There were no significant differences between the bacterial communities associated with different body parts of the four scyphozoan jellyfish. Core bacteria in various compartments of the four scyphozoan taxa comprised 57 OTUs (Operational Taxonomic Units), dominated by genera Mycoplasma, Vibrio, Ralstonia, Tenacibaculum, Shingomonas and Phyllobacterium. FAPROTAX function prediction revealed that jellyfish could influence microbially mediated biogeochemical cycles, compound degradation and transmit pathogens in regions where they proliferate. Finally, Six genera of potentially pathogenic bacteria associated with the scyphozoans were detected: Vibrio, Mycoplasma, Ralstonia, Tenacibaculum, Nautella, and Acinetobacter. Our study suggests that blooms of these four common scyphozoans may cause jellyfish species-specific impacts on element cycling in marine ecosystems, and serve as vectors of pathogenic bacteria to threaten other marine organisms and human health.

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Section: Discussionmentioning

confidence: 99%

Bacterial Communities Associated With Four Blooming Scyphozoan Jellyfish: Potential Species-Specific Consequences for Marine Organisms and Humans Health

Peng

et al. 2021

Front. Microbiol.

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“…These bacteria can survive in various extreme conditions [78,79] and can utilize a wide range of substrates, such as polycyclic aromatic hydrocarbons (PAHs), polymers, and simple inorganic substances (nitrogen, etc.) [80,81]. Several studies have shown that Sphingomonas possesses genes encoding dissimilatory nitrate reductase (nirB) and nitrite reductase (nirB and nirD), which suggests that Sphingomonas can possibly further process products of bacterial ammonia oxidation [82,83].…”

Section: Functional Characteristics Of Bacterial Communities Between ...mentioning

confidence: 99%

Marine Bacterial Communities in the Xisha Islands, South China Sea

Wang

Liu

et al. 2023

Diversity

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Oligotrophic marine environments are ecological funnels in marine ecosystems and are essential for maintaining the health and balance of the entire marine ecosystem. Bacterial communities are one of the most important biological populations, which can survive in low-nutrient environments and perform a variety of important ecological functions, such as decomposing and absorbing organic waste in the ocean and converting nitrogen from the atmosphere into a usable nitrogen source, thus maintaining the health of marine ecosystems. The bacterioplankton community composition and potential function were analyzed using 16S rRNA gene amplicon sequencing in oligotrophic coral reef sea areas. The diversity of the bacterial community exhibited significant differences between the four studied regions. Proteobacteria (38.58–62.79%) were the most abundant in all sampling sites, followed by Cyanobacteria (15.41–37.28%), Bacteroidota (2.39–6.67%), and Actinobacteriota (0.45–1.83%). Although bacterioplankton communities presented no difference between surface and bottom water regarding community richness and α-diversity, the bacterial community composition presented significant differences between surface and bottom water regarding β-diversity. Alteromonadales, Rhodospirllales, and Chloroplast were identified as the significantly different communities between the surface and bottom (Q value < 0.01). Bacterial community distribution in different regions was mainly affected by pH, dissolved oxygen, and nutrients. Nitrite ammonification, chitinolysis, predatory or exoparasitic, chloroplasts, chemoheterotrophy, aerobic chemoheterotrophy, phototrophic, compound degradation (mostly nutrients and pollutants), nitrogen cycle, fermentation, and intracellular parasitism were the dominant functions in the four regions.

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“…Its molecular weight is 2.88–5.18 kDa. The rheological properties of this novel thickener have been recently evaluated 20 and used to prevent destabilization processes in lemongrass nanoemulsions 21 . However, this biological macromolecule has never been used in combination with a protein.…”

Section: Introductionmentioning

confidence: 99%

Optimization of sonication parameters to obtain food emulsions stabilized by zein: formation of zein–diutan gum/zein–guar gum complexes

et al. 2021

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BACKGROUND Zein as a sole material is not suitable for technological applications since it is not flexible. A possible solution to extend the applications of zein is the formation of zein–polysaccharide complexes. As a first step, sonication parameters were optimized to obtain finer emulsions formulated with zein, rosemary essential oil as food preservative, and sunflower oil, by means of response surface methodology. After the formation of these guar– or diutan–zein complexes the rheological properties of these food emulsions were evaluated. RESULTS An increase in sonication power, sonication time and cycles provoked a decrease in mean droplet size and a lack of recoalescence. The optimized emulsion was the starting point to form two different complexes: zein with diutan gum and zein with guar gum at different concentrations. Rheological properties as well as the microstructure observed by field emission scanning electron microscopy (FESEM) were analyzed. Interestingly, zein–guar gum complexes did not form a rheological gel; as a consequence, emulsions containing them seem to undergo a destabilization process with aging time. In contrast, emulsions formulated with zein–diutan gum presented a 3D network, observed by FESEM technique and proved by rheological measurements. CONCLUSION While emulsions containing zein–guar gum complexes did not form networks to stabilize oil droplets, zein–diutan gum complexes did. This work brings to light the importance of the selection of polysaccharide used in food emulsions formulated with zein. © 2021 Society of Chemical Industry.

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Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by concentration

Cited by 13 publications

References 22 publications

Bacterial Communities Associated With Four Blooming Scyphozoan Jellyfish: Potential Species-Specific Consequences for Marine Organisms and Humans Health

Bacterial Communities Associated With Four Blooming Scyphozoan Jellyfish: Potential Species-Specific Consequences for Marine Organisms and Humans Health

Marine Bacterial Communities in the Xisha Islands, South China Sea

Optimization of sonication parameters to obtain food emulsions stabilized by zein: formation of zein–diutan gum/zein–guar gum complexes

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