Development of a macroalgal biomass sensor for an integrated multi-trophic aquaculture (IMTA) system

2021 ◽  
Author(s):  
Guifang Tang ◽  
Yanjun Li ◽  
Paul S. Wills ◽  
Dennis M. Hanisak ◽  
Bing Ouyang
Keyword(s):  
Macroalgal Biomass

scholarly journals Innovative Ultrasound-Assisted Approaches towards Reduction of Heavy Metals and Iodine in Macroalgal Biomass

Foods ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 649
Author(s):  
Estefanía Noriega-Fernández ◽  
Izumi Sone ◽  
Leire Astráin-Redín ◽  
Leena Prabhu ◽  
Morten Sivertsvik ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Dry Weight ◽  
The Other ◽  
Laminaria Hyperborea ◽  
Other Hand ◽  
Macroalgal Biomass ◽  
Ultrasound Assisted ◽  
I 31

The aim of this work was to evaluate the potential of ultrasound (US), alone or in combination with mild heating and/or EDTA towards reduction of As, Cd, I, and Hg content of Laminaria hyperborea. Concentrations of As, Cd, I, and Hg of 56.29, 0.596, 7340, and <0.01 mg kg−1 of dry weight, respectively, were found in L. hyperborea blades. Treatment with US at 50 °C increased approx. 2-fold the amount of As released, although did not affect significantly the content of Cd or I, as compared to control (no US) samples. Reducing the temperature to 8 °C significantly decreased the effect of US, but heating at 80 °C did not cause a significant effect as compared to treatments at 50 °C. On the other hand, treatment with 0.1 N EDTA at 50 °C enhanced the percentage of Cd released by approximately 7-fold, regardless of sonication. In the present work, the combination of US and EDTA at 50 °C for 5 min led to a significant reduction of the As (32%), Cd (52%) and I (31%) content in L. hyperborea, thus improving the product’s safety for consumers.

Macroalgal biomass in terms of third-generation biorefinery concept: Current status and techno-economic analysis – A review

2021 ◽  
pp. 100863
Author(s):  
K.D. González-Gloria ◽  
Rosa M. Rodríguez-Jasso ◽  
Shiva ◽  
E. Aparicio ◽  
Mónica L. Chávez González ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Current Status ◽  
Third Generation ◽  
Macroalgal Biomass

scholarly journals Challenges for marine macroalgal biomass production in Indian coastal waters

2020 ◽  
Vol 63 (4) ◽  
pp. 327-340
Author(s):  
Kapilkumar Nivrutti Ingle ◽  
Hadar Traugott ◽  
Alexander Golberg
Keyword(s):  
Coastal Waters ◽  
Large Scale ◽  
Full Potential ◽  
Seaweed Cultivation ◽  
Indian Government ◽  
Processing Technologies ◽  
Macroalgal Biomass ◽  
Large Scale Cultivation ◽  
Macroalgal Cultivation ◽  
Seaweed Industry

AbstractDue to its large, exclusive economic zone, India has considerable potential for implementing large-scale cultivation of macroalgae. However, such cultivation requires the availability of, and access to, sites where technical, legal, governmental, and environmental factors are favorable. This review discusses the challenges that have held back the development of seaweed cultivation in India. The review is based on a literature survey and informal discussions with industry-related personnel. It cites the strong need for clear and definitive policies related to access to and use of coastal waters to enable the Indian seaweed industry to reach its full potential. The main challenges that the expansion of macroalgal cultivation in India face are related to legal and regulatory aspects that can be resolved by focusing the policy issues on providing planning tools toward success. In addition, there is a strong need for an adequate bioeconomy that clearly defines the need for marine macroalgal biomass for food, chemicals, and biofuels. Furthermore, the Indian government needs to allocate sufficient funds for accelerating seaweed R&D in areas of seaweed cultivation, harvesting, processing technologies, and their implementation in the local industry.

Efficient Biocatalytic Conversion of Stranded Green Macroalgal Biomass Using a Specific Cellulases-Based Cocktail

2018 ◽  
Vol 11 (1) ◽  
pp. 211-222 ◽  
Author(s):  
Nesrine Ben Yahmed ◽  
Nadia Berrejeb ◽  
Mohamed Amine Jmel ◽  
Souhir Jazzar ◽  
M. Nejib Marzouki ◽  
...  
Keyword(s):  
Macroalgal Biomass

scholarly journals Macroalgal Bioindicators of Recovery from Eutrophication in a Tidal Lagoon Following Wastewater Diversion and Earthquake Disturbance

2019 ◽  
Vol 43 (2) ◽  
pp. 240-255 ◽  
Author(s):  
Neill Barr ◽  
John Zeldis ◽  
Kristin Scheuer ◽  
David Schiel
Keyword(s):  
Water Quality ◽  
Water Quality Monitoring ◽  
N Availability ◽  
Percent Cover ◽  
Macroalgal Biomass ◽  
Untreated Sewage ◽  
Wastewater Infrastructure ◽  
N Enrichment ◽  
One Year ◽  
Large Earthquakes

AbstractTogether, macroalgal tissue biochemical nitrogen indices (N-indices) and macroalgal abundance can be used as bioindicators of N-enrichment in estuaries. In this study, we examine the extent and rates of response of Ulva bioindicators during rapid N-enrichment perturbations in the eutrophic Avon-Heathcote Estuary (AHE) (Christchurch, New Zealand). With the diversion of the city’s wastewater discharge away from the estuary in March 2010, a ~ 90% reduction in the estuary’s N-concentration was expected. In turn, this was expected to reduce macroalgal biomass and improve the overall trophic condition of the estuary. We surveyed Ulva bioindicators over a five-year period spanning the diversion. There was a rapid (within one year) transition away from eutrophic condition reflected in N-indices (tissue-chlorophyll, -free amino acids, -N and -δ15N) following wastewater diversion, towards values corresponding with ‘cleaner’ water quality. This was accompanied by large reductions in Ulva percent cover, based on seasonal surveys conducted from 2001 to 2014. However, two large earthquakes in February and June 2011 caused a breakdown of the city’s wastewater infrastructure, resulting in overflows of untreated sewage into the estuary between February and November 2011. The re-enrichment of N and changes in N-sources (treated versus untreated sewage) were rapidly reflected in Ulva bioindicators, notably δ15N. Following repair of infrastructure, Ulva bioindicators again reverted towards a less eutrophic state. Overall, bioindicators were sensitive to changes in N-availability and N-source, and useful for identifying the position of algal populations on a eutrophic-to-oligotrophic gradient. These attributes demonstrated their utility as adjuncts to water quality monitoring and algal biomass surveys.

scholarly journals Dual Agarolytic Pathways in a Marine Bacterium, Vibrio sp. Strain EJY3: Molecular and Enzymatic Verification

2020 ◽  
Vol 86 (6) ◽  
Author(s):  
Sora Yu ◽  
Eun Ju Yun ◽  
Dong Hyun Kim ◽  
So Young Park ◽  
Kyoung Heon Kim
Keyword(s):  
Marine Bacteria ◽  
Marine Bacterium ◽  
Extracellular Enzymes ◽  
Alternative Pathway ◽  
Recombinant Enzymes ◽  
Red Macroalgae ◽  
Macroalgal Biomass ◽  
Sugar Unit ◽  
Branching Point

ABSTRACT Vibrio sp. strain EJY3 is an agarolytic marine bacterium that catabolizes 3,6-anhydro-l-galactose (AHG), a monomeric sugar unit of agarose. While the AHG catabolic pathway in EJY3 has been discovered recently, the complete agarolytic system of EJY3 remains unclear. We have identified five enzymes, namely, the β-agarases VejGH50A, VejGH50B, VejGH50C, and VejGH50D and the α-neoagarooligosaccharide (NAOS) hydrolase VejGH117, involved in the agarolytic system of EJY3. Based on the characterization of recombinant enzymes and intracellular metabolite analysis, we found that EJY3 catabolizes agarose via two different agarolytic pathways. Among the four β-agarases of EJY3, VejGH50A, VejGH50B, and VejGH50C were found to be extracellular agarases, producing mainly neoagarotetraose (NeoDP4) and neoagarobiose. By detecting intracellular NeoDP4 in EJY3 grown on agarose, NeoDP4 was observed being taken up by cells. Intriguingly, intracellular NeoDP4 acted as a branching point for the two different downstream agarolytic pathways. First, via the well-known agarolytic pathway, NeoDP4 was depolymerized into monomeric sugars by the exo-type β-agarase VejGH50D and the α-NAOS hydrolase VejGH117. Second, via the newly found alternative agarolytic pathway, NeoDP4 was depolymerized into AHG and agarotriose (AgaDP3) by VejGH117, and AgaDP3 then was completely depolymerized into monomeric sugars by sequential reactions of the agarolytic β-galactosidases (ABG) VejABG and VejGH117. Therefore, by experimentally verifying agarolytic enzymatic activity and transport of NeoDP4 into EJY3 cells, we revealed that EJY3 possesses both the known pathway and the newly discovered alternative pathway that involves α-NAOS hydrolase and ABG. IMPORTANCE Agarose is the main polysaccharide of red macroalgae and is composed of galactose and 3,6-anhydro-l-galactose. Many marine bacteria possess enzymes capable of depolymerizing agarose into oligomers and then depolymerizing the oligomers into monomers. Here, we experimentally verified that both a well-known agarolytic pathway and a novel agarolytic pathway exist in a marine bacterium, Vibrio sp. strain EJY3. In agarolytic pathways, agarose is depolymerized mainly into 4-sugar-unit oligomers by extracellular enzymes, which are then transported into cells. The imported oligomers are intracellularly depolymerized into galactose and 3,6-anhydro-l-galactose by two different agarolytic pathways, using different combinations of intracellular enzymes. These results elucidate the depolymerization routes of red macroalgal biomass in the ocean by marine bacteria and provide clues for developing industrial processes for efficiently producing sugars from red macroalgae.

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