Microalgal Biotechnology and Bioenergy in Dunaliella

Shariati, Mansour; Hadi, Mohammad Reza Haj Seyed

doi:10.5772/19046

Cited by 16 publications

(15 citation statements)

References 57 publications

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“…Human pathogenic bacteria were cultured in LB (Luria–Bertani) medium, while fish pathogens were cultured in TSB (Tryptic Soy Broth) medium. Fresh water microalgae were cultured in TAP (Tris-Acetate-Phosphate) medium, whereas halophilic microalgae were cultured in modified Johnson’s medium [ 37 , 38 ]. Finally, YPD (Yeast extract-Peptone-Dextrose) and MHE 25 (CECT 188) media were used for yeast and archaea growth, respectively.…”

Section: Methodsmentioning

confidence: 99%

Antioxidant, Antimicrobial, and Bioactive Potential of Two New Haloarchaeal Strains Isolated from Odiel Salterns (Southwest Spain)

Gómez‐Villegas

Vigara

Vilà

et al. 2020

Biology

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The need to survive in extreme environments has furnished haloarchaea with a series of components specially adapted to work in such conditions. The possible application of these molecules in the pharmaceutical and industrial fields has received increasing attention; however, many potential bioactivities of haloarchaea are still poorly explored. In this paper, we describe the isolation and identification of two new haloarchaeal strains from the saltern ponds located in the marshlands of the Odiel River, in the southwest of Spain, as well as the in vitro assessment of their antioxidant, antimicrobial, and bioactive properties. The acetone extract obtained from the new isolated Haloarcula strain exhibited the highest antioxidant activity, while the acetone extracts from both isolated strains demonstrated a strong antimicrobial activity, especially against other halophilic microorganisms. Moreover, these extracts showed a remarkable ability to inhibit the enzyme cyclooxygenase-2 and to activate the melanogenic enzyme tyrosinase, indicating their potential against chronic inflammation and skin pigmentation disorders. Finally, the aqueous protein-rich extracts obtained from both haloarchaea exhibited an important inhibitory effect on the activity of the acetylcholinesterase enzyme, involved in the hydrolysis of cholinergic neurotransmitters and related to several neurological diseases.

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Section: Methodsmentioning

confidence: 99%

Antioxidant, Antimicrobial, and Bioactive Potential of Two New Haloarchaeal Strains Isolated from Odiel Salterns (Southwest Spain)

Gómez‐Villegas

Vigara

Vilà

et al. 2020

Biology

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“…Some microalgae are able to endure extreme conditions of cultivation and this may act as a competitive advantage in relation to contaminants in the liquid medium. An example is Dunaliella salina , which can grow in high concentrations of salinity, greater than 4% per mass [ 26 ]. The application of a specific stressor, such as a radical increase in the salinity of the microalgae medium, can damage the regulatory system of the predators without any loss of microalgae cells [ 14 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Allelopathy as a potential strategy to improve microalgae cultivation

Mendes

Vermelho

2013

Biotechnol Biofuels

111

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One of the main obstacles for continuous productivity in microalgae cultivation is the presence of biological contaminants capable of eliminating large numbers of cells in a matter of days or even hours. However, a number of strategies are being used to combat and prevent contamination in microalgae cultivation. These strategies include the use of extreme conditions in the culture media such as high salinity and high pH to create an unfavorable environment for the competitive organisms or predators of the microalgae. Numerous studies have explored the potential of naturally occurring bioactive secondary metabolites, which are natural products from plants and microorganisms, as a source of such compounds. Some of these compounds are herbicides, and marine and freshwater microalgae are a source of these compounds. Microalgae produce a remarkable diversity of biologically active metabolites. Results based on the allelopathic potential of algae have only been described for laboratory-scale production and not for algae cultivation on a pilot scale. The adoption of allelopathy on microalgal strains is an unexplored field and may be a novel solution to improve algae production. Here we present information showing the diversity of allelochemicals from microalgae and the use of an allelopathic approach to control microalgae cultivation on a pilot scale based on R&D activities being carried out in Brazil for biodiesel production.

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“…Carotenoids, glycerol, proteins and vitamins are the basic intracellular compounds in algae with autoxidation and anticancer properties (Gomez et al, 2003). Dunaliella produce glycerol as the osmoprotectant in order to cope with salt stress (Shariati and Hadi, 2011).…”

Section: Introductionmentioning

confidence: 99%

Gene Expression Analysis in Dunaliella salina Under Salt Stress

Ganjali

Shahriari

Ahmadzadeh

2019

JPR

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Different salt concentrations are found in the large portion of water resources and agriculture lands in which most of the plant species cannot be grown. Some microalgae species can be grown either in seawater or in brackish water which is not usable for normal agriculture. The present study analyzed the gene expressions associated with salt stress in Dunaliella Salina. The expression of three coding genes namely acetyl-CoA carboxylase (ACC), channelrhodopsin-1 DChR1 protein (DC), and sodium-coupled phosphate transporter protein (DSSPT) were evaluated at three salinity levels: 3 gl-1 (low), 32 gl-1 (control), 100 gl-1 (high). The analysis were performed on the 5 th , 10 th and 17 th day of culture. The results revealed that for low and high salt treatments, the lowest gene expressions were observed on 5 th day of growth, however, the gene 10 th day. It should be noted that, under low salinity conditions (3 gl-1), gene expressions were lower than high salinity concentration during the growth phase.

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Microalgal Biotechnology and Bioenergy in Dunaliella

Cited by 16 publications

References 57 publications

Antioxidant, Antimicrobial, and Bioactive Potential of Two New Haloarchaeal Strains Isolated from Odiel Salterns (Southwest Spain)

Antioxidant, Antimicrobial, and Bioactive Potential of Two New Haloarchaeal Strains Isolated from Odiel Salterns (Southwest Spain)

Allelopathy as a potential strategy to improve microalgae cultivation

Gene Expression Analysis in Dunaliella salina Under Salt Stress

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