China
Africa
Explore chapters and articles related to this topic
Seaweed Antimicrobials
Published in Gokare A. Ravishankar, Ranga Rao Ambati, Handbook of Algal Technologies and Phytochemicals, 2019
María José Pérez, Elena Falqué, Herminia Domínguez
Carbalho et al. (2017) evaluated the antibacterial activity of six algal species against Gram negative marine strains as V. aestuarianus, Pseudoalteromonas elyakovii, Polaribacter irgensii and Pseudomonas fluorescens, involved in marine fouling, and Shewanella putrefaciens in corrosion of metal; and pathogenic Vibrio strains (V. communis, V. alginolyticus and V. coralliilyticus). The authors observed that Canistrocarpus cervicornis was the most effective one and inhibited the growth of S. putrefaciens and V. aestuarianus; Padina sp. and Colpomenia sinuosa inhibited the growth of V. communis and V. alginolyticus, respectively. S. vulgare inhibited the growth of the Vibrio species suggesting that this species possesses active compounds which protect them against fouling and pathogenic bacteria.
Food Preservation and the Antimicrobial Activity of Australian Native Plants
Published in Yasmina Sultanbawa, Fazal Sultanbawa, Australian Native Plants, 2017
Davidson plum species have also shown broad-spectrum antimicrobial activity (Sultanbawa et al., 2015; Zhao and Agboola, 2007). The ethanol and acetone extracts of Davidson’s plum at a concentration of 8.75% (v/v) showed complete inhibition of both S. aureus and E. coli and in excess of 90% inhibition was observed with the water extract (Table 19.5). The polyphenol-rich extracts of ethanol, methanol, water and acetone at 8.75% (v/v) inhibited the growth of the following organisms: Staphylococcus aureus, Escherichia coli, Listeria monocytogenes, Shewanella putrefaciens, Acinetobacter baumannii, Enterobacter aerogenes, Psuedomonas aeruginosa, Proteus vulgaris (Table 19.5). The major phenolic compounds identified in the polyphenol-rich fraction included EA, EA derivatives, quercetin, rutin, myricetin and flavonoids including delphinidin sambubioside, and cyanidin sambubioside. The high level of EA could have contributed to the antimicrobial activity in Davidson plum (Sultanbawa et al., 2015).
Radionuclide Concentrations in Soils lution-Processed Organic Solar Cells
Published in Michael Pöschl, Leo M. L. Nollet, Radionuclide Concentrations in Food and the Environment, 2006
The reduction of Tc(VII) to Tc(IV) is caused by bacteria such as Shewanella putrefaciens [19], Geobacter sulfurreducens [20], and some sulfate-reducing bacteria [21] under strict anaerobic conditions. In addition to the technetium reduction, Geobacter metallireducens produces insoluble technetium precipitate. These technetium-reducing anaerobic bacteria are often found in soils under waterlogged conditions (e.g., paddy fields) [22]. The presence of such technetium-reducing anaerobic bacteria in paddy soils raises the expectations of reduction and precipitation of technetium in the water covering these soils.
Characterization of the biofilm grown on 304L stainless steel in urban wastewaters: extracellular polymeric substances (EPS) and bacterial consortia
Published in Biofouling, 2020
Islem Ziadi, Leila El-Bassi, Latifa Bousselmi, Hanene Akrout
In 11 day aged biofilm, Shewanella sp. was isolated from biofilms in the UTUWW and the TUWW. In 11 day aged biofilm in UTUWW: Shewanella putrefaciens (strain IB6; MK779773) and in TUWW: Shewanella xiamenensis (strain IB13, MK778510), Shewanella hafniensis (strain IB14; MK775013), Shewanella oneidensis (strain IB15; MK777979). In the present experimental conditions, phylogenetic analysis showed that Shewanella sp. is the main cluster present in the mature biofilm established on the SS after immersion for 11 days in the UTUWW and the TUWW. Shewanella was reported in previous studies as the bacterium reducing solid Fe3+ oxides to soluble Fe2+ ions in the presence of H2 as an electron donor (Libert et al. 2011; Moreira et al. 2014). El-Naggar et al. (2010) proposed a possible mechanism of electron transfer: the respiration rate of Shewanella is 2.6 × 10−6 electrons/cell/second using lactate as an electron donor. Thus, because of bacterial respiration, and alteration of the hydroxide layers, as a consequence, possible corrosion may occur. Therefore, the presence of Shewanella sp. could locally modify the hydroxide layer, which would initiate the creation of anodic zones and induce a difference in the electrochemical potential conductivity and the development of a localized corrosion process.