Effects of Surface Area and Flow Rate on Marine Bacterial Growth in Activated Carbon Columns

Shimp, Robert J.; Pfaender, Frederic K.

doi:10.1128/aem.44.2.471-477.1982

Cited by 47 publications

(16 citation statements)

References 17 publications

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“…Six devices (UA24, 28,29,30,32,38) were received with the tailstrings still attached to the device body while five devices (V5, UA18,34,43,64) had their tailstrings separated from the device body by intentional laboratory removal for culturing a section of the tailstring in the Fives-Taylor laboratory as described above. In the Robertson laboratory, each tailstring, except for UA64, was cut into sections of approximately 1 cm in length.…”

Section: Sample Preparationmentioning

confidence: 99%

Performance of the polypropylene fiber tailstring on the copper 7 intrauterine device

Warner¹,

Matsuno²,

Virgin³

et al. 1991

J of Applied Biomaterials

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New and used polypropylene tailstrings from the Copper 7 (Cu-7) intrauterine device were examined by a combination of analytical techniques. Optical microscopy, scanning acoustic and electron microscopy, x-ray diffraction, energy dispersive x-ray analysis, and chemical etching were employed to elucidate both the surface and interior morphology of new Cu-7 tailstrings. Tailstrings removed from women following varying periods of use were investigated with optical microscopy, scanning and transmission electron microscopy. In addition, a subset of the used tailstrings were cultured to identify the types of microorganisms associated with them. Our findings show that unused Cu-7 tailstrings are in various stages of degradation owing to a combination of factors which include the high-draw ratio employed during manufacturing, the method of packaging, and the use of a particulate colourant. Furthermore, it is evident that used Cu-7 tailstrings undergo major deterioration while in situ because of the unfavorable interactions between the highly drawn polypropylene and the physiological environment. These results indicate that the polypropylene tailstrings as manufactured for use with the Cu-7 IUD fail to meet accepted design criteria for biomedical implants.

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Section: Sample Preparationmentioning

confidence: 99%

Performance of the polypropylene fiber tailstring on the copper 7 intrauterine device

Warner¹,

Matsuno²,

Virgin³

et al. 1991

J of Applied Biomaterials

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“…Interest in biofilm formation has been driven by the importance of bacterial activity in many technological applications, together with a growing ability to exert control over surface properties. In particular, the ongoing effort to design antibacterial surfaces has served to identify a number of substratum surface characteristics that might influence bacterial attachment, including morphology, composition, roughness and porosity [9,10,[24][25][26][27][28][29]. According to one common scenario of biofilm formation, bacterial adhesion is initiated in surface irregularities that serve as microenvironments where bacteria are sheltered from unfavorable environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Impact of nano‐topography on bacterial attachment

Mitik-Dineva

Wang

Mocanasu

et al. 2008

Biotechnology Journal

171

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The adhesion of bacteria to surfaces is an important biological process, but one that has resisted simple categorization due to the number and complexity of parameters involved. The roughness of the substrate is known to play a significant role in the attachment process, particularly when the surface irregularities are comparable to the size of the bacteria and can provide shelter from unfavorable environmental factors. According to this scenario, roughness on a scale much smaller than the bacteria would not be expected to influence the initial attachment. To test this hypothesis, the impact of nanometer-scale roughness on bacterial attachment has been investigated using as-received and chemically etched glass surfaces. The surface modification by etching resulted in a 70% reduction in the nanoscale roughness of the glass surface with no significant alteration of its chemical composition or charge. Nevertheless, the number of bacteria adhering to the etched surface was observed to increase by a factor of three. The increase in attachment was also associated with an alteration in cellular metabolic activity as demonstrated by changes in characteristic cell morphologies and increased production of extracellular polymeric substances. The results indicate that bacteria may be more sensitive to nanoscale surface roughness than was previously believed.

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“…Accordingly, the best pore size for attachment should range between the smallest cell dimension and five times its largest dimension. Shimp and Pfaender [22] also reported that microbe-size crevices favor surface colonization.…”

Section: Introductionmentioning

confidence: 94%

Influence of physico-chemical properties of porous microcarriers on the adhesion of an anaerobic consortium

Pereira

Alves

Azeredo

et al. 2000

Journal of Industrial Microbiology and Biotechnology

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The ability for biomass colonization of four porous mineral microcarriers (sepiolite, clay, pozzolana and foam glass-Poraver™), was studied and related to their surface properties. The surface hydrophobicity of the mineral carriers was a more important factor influencing colonization by the anaerobic consortium than was surface charge. It was possible to correlate linearly the degree of hydrophobicity with the biomass retention capacity. Although the thermodynamic theory did not explain adhesion, an increase in cell attachment was directly related to the decrease of the positive values of the free energy of adhesion. Surface roughness, porosity and the amount of surface Mg 2+ , were also determinant factors in bacterial immobilization. However a great biomass accumulation can originate a decrease in biological activity due to mass transfer limitations.

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Effects of Surface Area and Flow Rate on Marine Bacterial Growth in Activated Carbon Columns

Cited by 47 publications

References 17 publications

Performance of the polypropylene fiber tailstring on the copper 7 intrauterine device

Performance of the polypropylene fiber tailstring on the copper 7 intrauterine device

Impact of nano‐topography on bacterial attachment

Influence of physico-chemical properties of porous microcarriers on the adhesion of an anaerobic consortium

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