Allelopathy and competition between Chlorella vulgaris and Pseudokirchneriella subcapitata: Experiments and mathematical model

Fergola, P.; Cerasuolo, Marianna; Pollio, Antonino; Pinto, Gabriele; DellaGreca, Marina

doi:10.1016/j.ecolmodel.2007.05.024

Cited by 94 publications

(72 citation statements)

References 41 publications

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“…This is contrary to the later studies (e.g. Fergola et al 2007), which found out that chlorellin is mainly composed of hydrophobic C18 FAs.…”

Section: Doi: 1017221/8522-cjascontrasting

confidence: 55%

“…In contrast to their results, the level of polyunsaturated FAs in PN was markedly lower. In addition, Fergola et al (2007) prepared synthetic chlorellin as a mixture of four C18 FAs (stearic, oleic, linoleic, and linolenic acids) and assayed the impact on another green alga, Pseudokirchneriella subcapitata (newly Raphidocelis subcapitata). The results of that study suggest the use of artificial chlorellin, available in large amounts, instead of natural chlorellin, which is produced in limited quantities (Fergola et al 2007).…”

Section: Discussionmentioning

confidence: 99%

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Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Čermák¹,

Pražáková²,

Marounek³

et al. 2015

CZECH J ANIM SCI

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ABSTRACT:The green alga Planktochlorella nurekis (Chlorellaceae, Chlorophyta) is considered a producer of antibacterial mixture of long-chain fatty acids, which has possibly similar composition and mode of action as chlorellin produced by another green alga, Chlorella vulgaris. Although the antibacterial properties of C. vulgaris have been reported, the interactions of P. nurekis with bacteria have not been determined yet. The aim of this study was to elucidate the effect of P. nurekis water suspension on growth of selected gastrointestinal bacteria in vitro so that it could be used as a suitable feed supplement in animal farming. Unknown bacterial populations occurring in the algal suspension were identified using 16S rRNA sequencing assay. Selected strains were cultivated with lyophilized P. nurekis and the antibacterial effect was monitored. The composition of fatty acids and heat sensitivity of antibacterial substances were also examined. Sequencing analysis of 71 bacterial 16S rRNA genes in xenic algal suspension identified common environmental microbiota, one strain belonging to the class Alphaproteobacteria, 17 to Betaproteobacteria, 44 to Gammaproteobacteria (dominated by Pseudomonas putida strains), and nine to Sphingobacteria. The antimicrobial activity of P. nurekis suspension was tested at a concentration range of 0.75-6 mg/ml. The highest inhibitory effect was observed on bifidobacteria. Statistically significant reductions in bacterial counts were also observed for Escherichia coli, Salmonella enterica var. Enteritidis, S. enterica var. Infantis, Campylobacter jejuni, and Arcobacter butzleri. The growth of Lactobacillus johnsonii was significantly stimulated. The relative proportions of C14-C22 fatty acids in P. nurekis were found as follows: saturated 54.28%, monounsaturated 30.40%, and polyunsaturated 7.16%. The antibacterial compounds present in P. nurekis suspension exhibited thermostability. The results indicate that P. nurekis can inhibit some pathogenic gastrointestinal bacteria and seems to be a promising essential nutrients source in animal nutrition.

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“…This is contrary to the later studies (e.g. Fergola et al 2007), which found out that chlorellin is mainly composed of hydrophobic C18 FAs.…”

Section: Doi: 1017221/8522-cjascontrasting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Čermák¹,

Pražáková²,

Marounek³

et al. 2015

CZECH J ANIM SCI

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“…In commercial systems, however, both these interactions and grazing can generate important changes in biomass structure, in some instances even being counterintuitive; Mitra & Flynn (2006) describe and model a situation where an outwardly inferior microalga grows to dominate a system. Modelling allelopathic interactions in microalgal systems has been considered by Fergola et al (2007).…”

Section: Optimization Of Microalgal Growth and Production Of Specificmentioning

confidence: 99%

Placing microalgae on the biofuels priority list: a review of the technological challenges

Greenwell

Laurens

Shields

et al. 2009

J. R. Soc. Interface.

715

359

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Microalgae provide various potential advantages for biofuel production when compared with 'traditional' crops. Specifically, large-scale microalgal culture need not compete for arable land, while in theory their productivity is greater. In consequence, there has been resurgence in interest and a proliferation of algae fuel projects. However, while on a theoretical basis, microalgae may produce between 10-and 100-fold more oil per acre, such capacities have not been validated on a commercial scale. We critically review current designs of algal culture facilities, including photobioreactors and open ponds, with regards to photosynthetic productivity and associated biomass and oil production and include an analysis of alternative approaches using models, balancing space needs, productivity and biomass concentrations, together with nutrient requirements. In the light of the current interest in synthetic genomics and genetic modifications, we also evaluate the options for potential metabolic engineering of the lipid biosynthesis pathways of microalgae. We conclude that although significant literature exists on microalgal growth and biochemistry, significantly more work needs to be undertaken to understand and potentially manipulate algal lipid metabolism. Furthermore, with regards to chemical upgrading of algal lipids and biomass, we describe alternative fuel synthesis routes, and discuss and evaluate the application of catalysts traditionally used for plant oils. Simulations that incorporate financial elements, along with fluid dynamics and algae growth models, are likely to be increasingly useful for predicting reactor design efficiency and life cycle analysis to determine the viability of the various options for largescale culture. The greatest potential for cost reduction and increased yields most probably lies within closed or hybrid closed -open production systems.

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“…In nature there are large classes of marine species other than fish such as Algae and bacterial that produce toxic substance which effect the other species while competing for food [14]. But in some cases the toxic substance released by one species may not effect the other species immediately, but with some delay in time.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Allelopathic Two Species Model Having Delay in Predation

Srinivas¹,

Murthy²,

Prasanthi³

2014

IOSRJM

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Allelopathy and competition between Chlorella vulgaris and Pseudokirchneriella subcapitata: Experiments and mathematical model

Cited by 94 publications

References 41 publications

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Placing microalgae on the biofuels priority list: a review of the technological challenges

Dynamics of Allelopathic Two Species Model Having Delay in Predation

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