Contrasting effects of extracellular polymeric substances on the surface characteristics of bacterial pathogens and cell attachment to soil particles

Zhao, Wenqiang; Walker, Sharon L.; Huang, Qiaoyun; Cai, Peng

doi:10.1016/j.chemgeo.2015.06.013

Cited by 23 publications

(5 citation statements)

References 108 publications

(150 reference statements)

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“…The peaks at 1163 and 1076 cm –1 correspond to the C–O stretching and C–O–C vibrations of polysaccharides, 948 cm –1 for the O–P–O vibration, and 860 cm –1 for the C–O–P ring vibration in polysaccharides. The fingerprint region between 800 and 500 cm –1 exhibited ring vibrations from aromatic amino acids and nucleotides. − These results indicated the presence of hydroxyl, amino, carboxyl, phosphoryl, and phosphate functional groups binding sites on the EPS of microflora surface. These functional groups could participate in various electrochemical, biological chemical, and surface chemical activity, such as material transport, electron exchange, and metal ion chelating .…”

Section: Resultsmentioning

confidence: 88%

Potential of Crystalline and Amorphous Ferric Oxides for Biostimulation of Anaerobic Digestion

Wang

Zhao

Niu

et al. 2018

ACS Sustainable Chem. Eng.

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Iron oxides have been widely investigated to accelerate the conversion of organic wastes to methane. However, the potential mechanism involved with different types of iron oxides is a controversial topic. In this study, crystalline Fe 2 O 3 and amorphous Fe (OH) 3 were respectively supplemented to explore the effects of the crystal form of Fe(III) on anaerobic digestion. The results showed that the addition of Fe 2 O 3 and Fe(OH) 3 both significantly enhanced COD removal and biomethanation compared with the control. The reason was related to that the supplement of Fe(OH) 3 induced an efficient microbial dissimilatory iron reduction to enhance the decomposition of complex organics into simples. Consistently, 28.3% of Fe(OH) 3 dosed at the initial stage were reduced into Fe(II), while no obvious iron reduction was observed with the Fe 2 O 3 supplement. Interestingly, Fe 2 O 3 significantly stimulated the secretion of protein and humic acid-like substances in EPS, leading to an electron-transfer capacity higher than that for Fe(OH) 3 and control reactors, which seemed to be an important reason for the improved anaerobic performance. The gene function prediction also showed a different degree of expression of functional genes involved in amino-acid, polysaccharides, and inorganic ion transport and metabolism in the presence of Fe 2 O 3 and Fe(OH) 3 . This study helped to give a more comprehensive insight for the mechanisms of ferric oxides on the improvement of anaerobic digestion.

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Section: Resultsmentioning

confidence: 88%

Potential of Crystalline and Amorphous Ferric Oxides for Biostimulation of Anaerobic Digestion

Wang

Zhao

Niu

et al. 2018

ACS Sustainable Chem. Eng.

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“…44 The peak at 1046 cm −1 was associated with Si−O stretching and only occurred on spores without EPS, indicating this might be related to an element present on cell walls. 45 No significant peaks were observed below 1000 cm −1 in the presence or absence of EPS, which indicates that no phosphate groups or nucleic acid groups were apparent under any conditions. Spores without EPS exhibited fewer functional groups with weaker peaks, suggesting that the extraction method effectively removed EPS from the surface of D. discoideum spores.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…The spores containing an EPS layer exhibited strong peaks at 3291, 2922, 1242, and 1547 cm –1 , associated with O–H, C–H, C–N, and N–H stretching, respectively, with weaker peaks at 980 and 2349 cm –1 associated with C–H and OCO stretching and alicyclic vibrations, respectively . The peak at 1046 cm –1 was associated with Si–O stretching and only occurred on spores without EPS, indicating this might be related to an element present on cell walls . No significant peaks were observed below 1000 cm –1 in the presence or absence of EPS, which indicates that no phosphate groups or nucleic acid groups were apparent under any conditions.…”

Section: Resultsmentioning

confidence: 98%

Transport and Retention of Free-Living Amoeba Spores in Porous Media: Effects of Operational Parameters and Extracellular Polymeric Substances

Jin

Zhao

et al. 2021

Environ. Sci. Technol.

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Amoebas are protists that are widespread in water and soil environments. Some species are pathogenic, inducing potentially lethal effects on humans, making them a major threat to public health. Nonpathogenic amoebas are also of concern because they have the potential to carry a mini-microbiome of bacteria, either transiently or via more long-term stable transport. Due to their resistance to disinfection processes, the physical removal of amoeba by filtration is necessary to prevent their propagation throughout drinking water distribution networks and occurrence in tap water. In this study, a model amoeba species Dictyostelium discoideum was used to study the transport and retention behavior of amoeba spores in porous media. The key factors affecting the transport behavior of amoeba spores in fully saturated media were comprehensively evaluated, with experiments performed using a quartz crystal microbalance with dissipation monitoring (QCM-D) and parallel plate chamber system. The effects of ionic strength (IS) on the deposition of spores were found to be in contrast to the predicted Derjaguin–Landau–Verwey–Overbeek (DLVO) theory that more deposition is observed under lower-IS conditions. The presence of extracellular polymeric substances (EPS) was found to be the main contributor to deposition behavior. Overall, these results provide plausible evidence for the presence of amoeba in tap water. Furthermore, this is one of the first studies to examine the mechanisms affecting the fate of amoeba spores in porous media, providing a significant baseline for future research to minimize the safety risk presented by amoeba in drinking water systems.

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“…On the one hand, the bonding between the coating and the metal surface is usually unstable. On the other hand, long-term antibiotic release increases the risk of drug resistance emerging [ 105 , 106 ]. Reddy et al performed a novel microscopic physical surface modification method (Sharklet) for preventing bacterial colonization and migration [ 107 ]; their results showed that the Sharklet micropattern was effective at inhibiting bacterial colonization and migration.…”

Section: Antibacterial Activity Of Cu-containing Alloysmentioning

confidence: 99%

Biological applications of copper-containing materials

Wang

Yuan

et al. 2021

Bioactive Materials

122

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Copper is an indispensable trace metal element in the human body, which is mainly absorbed in the stomach and small intestine and excreted into the bile. Copper is an important component and catalytic agent of many enzymes and proteins in the body, so it can influence human health through multiple mechanisms. Based on the biological functions and benefits of copper, an increasing number of researchers in the field of biomaterials have focused on developing novel copper-containing biomaterials, which exhibit unique properties in protecting the cardiovascular system, promoting bone fracture healing, and exerting antibacterial effects. Copper can also be used in promoting incisional wounds healing, killing cancer cells, Positron Emission Tomography (PET) imaging, radioimmunological tracing and radiotherapy of cancer. In the present review, the biological functions of copper in the human body are presented, along with an overview of recent progress in our understanding of the biological applications and development of copper-containing materials. Furthermore, this review also provides the prospective on the challenges of those novel biomaterials for future clinical applications.

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Contrasting effects of extracellular polymeric substances on the surface characteristics of bacterial pathogens and cell attachment to soil particles

Cited by 23 publications

References 108 publications

Potential of Crystalline and Amorphous Ferric Oxides for Biostimulation of Anaerobic Digestion

Potential of Crystalline and Amorphous Ferric Oxides for Biostimulation of Anaerobic Digestion

Transport and Retention of Free-Living Amoeba Spores in Porous Media: Effects of Operational Parameters and Extracellular Polymeric Substances

Biological applications of copper-containing materials

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