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Green Technology Applications for Algal Bloom Control
Published in Gokare A. Ravishankar, Ranga Rao Ambati, Handbook of Algal Technologies and Phytochemicals, 2019
Mostafa M. El-Sheekh, Mohamed M. Abdeldaim, Samiha M. Gharib, HalaY. El-Ksassas
Early, González et al. (2000) were interested in studying the effect of Roseobacter lineage culture to prevent the algal bloom of dinoflagellates. But during application of the treatment, it is important to search about the harmful algal blooms (HAB) especially in freshwater environments used humanely (Buchan et al. 2014). In freshwater environments, few workers have used microorganisms involving bacteria for controlling harmful algal blooms.
Protein amino-termini and how to identify them
Published in Expert Review of Proteomics, 2020
Annelies Bogaert, Kris Gevaert
Later on, an antibody against TMPP was developed, which allowed to capture reverse-phase separated TMPP-modified N-terminal peptides. Co-captured internal peptides were removed by several washes before TMPP-modified peptides were eluted in acidic conditions before analysis by LC-MS/MS. This method was applied to the proteome of Roseobacter denitrificans, leading to the identification of N-termini of 269 proteins, which appears to be as a rather modest amount.
Analysis of marine microbial communities colonizing various metallic materials and rust layers
Published in Biofouling, 2019
Yimeng Zhang, Yan Ma, Jizhou Duan, Xiaohong Li, Jing Wang, Baorong Hou
High-throughput sequencing data revealed the unique bacterial compositions on the surface of different metallic alloys, which differ from those in seawater. The ocean is a dynamic oligotrophic environment with low concentrations of nutrients. As expected, a common photolithoautotrophic bacterium, the cyanobacterium Synechococcus sp. (Lauro et al. 2009) as well as the photoheterotrophic Candidatus actinomarinidae (Ghai et al. 2013) dominated in the seawater sample (Table 2). However, metallic surfaces may enrich nutrients from seawater by charge-charge and/or hydrophobic interactions (Beveridge et al. 1997). In addition, some metals, such as iron, can act as electron donor indirectly by electrochemical cathodic reactions in case of metal corrosion or directly by electron transfer to microbes (Yu et al. 2013). For these reasons, metal and metal alloy surfaces exhibit more diverse chemotrophic microbial communities than the surrounding seawater (Table 1). This result is consistent with findings of previous studies showing that the surface-associated microbes are mainly copiotrophic, whereas free-living bacteria are mainly oligotrophic (Yooseph et al. 2010). Common marine surface colonizers such as Ruegeria were detected on the surfaces of the aluminum alloy and of the carbon steel. Bacteria of the genus Ruegeria belong to the marine Roseobacter clade. Many of these produce extracellular enzymes for biopolymer degradation (Dang and Lovell 2015). Due to the physico-chemical properties of each metallic material, each alloy was colonized by an unique microbial community. For example, Lactobacillus sp. was the dominant species on the surface of the copper alloy. The genus belongs to the lactic acid bacteria, and some of them have been proven to have a relatively strong copper binding capacity and be tolerant to copper ions (Mrvčić et al. 2013, Tian et al. 2015). This may be the explanation to why they were dominating the microflora on the copper alloy.
Short-term succession of marine microbial fouling communities and the identification of primary and secondary colonizers
Published in Biofouling, 2019
Raeid M. M. Abed, Dhikra Al Fahdi, Thirumahal Muthukrishnan
The results show that Alphaproteobacteria, Gammaproteobacteria and Flavobacteriia can be regarded as pioneer primary colonizers, which can mutually co-exist and establish a heterotrophic bacterial biofilm during the initial stages of biofouling. The previous detection of these groups in the seawater from the same experimental site (70 to 84% of the total number of sequences; Muthukrishnan et al. 2018), indicates their ability to shift from motile to sessile lifestyle by sensing environmental signals such as Na + flux in the surrounding water (Belas 2014). Lifestyle transitions in these bacterial groups are mediated by morphological or genetic traits that facilitate flagellar, swimming and twitching motility, holdfast structure, chemotaxis, biofilm formation, quorum sensing and production of antibiotics, siderophores and enzymes regulating motile-to-sessile transitions (Lee et al. 2008; Slightom and Buchan 2009; Thole et al. 2012; D’Alvise et al. 2014; Rampadarath et al. 2017; Levipan and Avendano-Herrera 2017). The predominance of Alpha-, Gammaproteobacteria and Flavobacteriia as primary colonizers has been previously recognized within marine biofouling communities in the Eastern Mediterranean (Elifantz et al. 2013), Arabian Gulf (Dobretsov et al. 2013b) and coastal Atlantic, Pacific and Indian Oceans (Dang and Lovell 2000, 2002; Moss et al. 2006; Lopez et al. 2006; Jones et al. 2007; Lee et al. 2008; Dang et al. 2008; Rampadarath et al. 2017; Pollet et al. 2018). While Alphaproteobacteria constituted 30-70% of the total number of sequences in one-week old biofilms in a desalination plant in the Mediterranean (Elifantz et al. 2013), its relative abundance was comparatively lower (22-41%) within the biofilm in the present study in the first week. The alphaproteobacterial genera Roseobacter, Ruegeria and Nautella encountered within the present biofilms can be considered as ecological generalists, owing to their prevalence in source seawater and other fouled surfaces (Dang and Lovell 2002; Buchan et al. 2005; Moran et al. 2007; Jones et al. 2007; Mayali et al. 2008; Vandecandelaere et al. 2009; Zhang et al. 2011; Dobretsov et al. 2013b; Elifantz et al. 2013).