Digital library

  • The effects of plant growth regulators on callus induction rate and regeneration of K. alvarezii explants was evaluated.K. alvarezii calluses were induced in vitro with kinetin (K), 6benzylaminopurine (B), 1-naphtalene acetic acid (N) and spermine (S). After 30 days, K. alvarezii explants produced filamentous calluses and isolated crystalline filaments growing from the medullar region and from cortical cells at the cut edge. The plant growth regulators 1-naphtalene acetic acid (1 mg L−1) and 6-benzylaminopurine (1 mg L−1) and the 1-naphtalene acetic acid + kinetin + spermine (1, 1, 0.018 mg L−1 respectively) combination produced 85 to 129% more calluses, with significant differences versus the control (p < 0.05). Spermine at 0.018 mg L−1 produced calluses in the apical, intercalary and basal regions of explants. Spermine also reduced callus induction time to 7 days, which is faster than previously reported induction times with other plant growth regulators. An airlift bioreactor was designed and characterized to micropropagate K. alvarezii calluses. The bioreactor had mixing times ranging from 4.6–10.3 s at T90 and T95, which is shorter than those for the Fernbach (5.2–13.4 s) and balloon flasks (6.3–17.3 s). Mixing time standard deviations were smaller for the bioreactor (1.1–4.6) than for the Fernbach (9.3–13.6) and balloon flasks (5.5–15.8), suggesting an adequate flow regime within the bioreactor. The results are useful for improving callus induction in K. alvarezii and propagating microplantlets in an airlift bioreactor, and provide baseline data for macroalgal bioreactor culture

    Author(s): Julieta Muñoz, Daniel Robledo, Armando C. Cahue-López , Rodrigo Patiño
  • The production of fish feed additives for the aquaculture industry is a thriving sector in China. These natural substances are being used for several purposes including the enhancement of the immune systems of farmed fish, promoting growth, attaining the desired flesh and skin pigmentation, as well as improving the organolepctic properties of the farmed product. At the same time, the use of such additives has no negative impacts to the farming environment.

    Author(s): Alessandro Lovatelli, Jiaxin Chen
  • Sustainability is the intersection of the environmental, economic, and social sectors. A goal USAID project in Myanmar is to institutionalize sustainability in all three sectors of the seafood industry, especially the aquaculture. Myanmar is currently in a state of political, economic, and environmental turmoil, and a sustainable seafood industry and aquaculture would benefit the nation. The plan involves restoring invaluable aquatic natural resources, improving the supply chain and governance of the seafood industry, and creating stability through food security and social equity. The effects that each of these central goals of the project have on the country are guided through the principles that the GPO, a World Bank organization, uses in assessing programs with the goal of sustainability. The effects will also be confirmed through the comparison to Vietnam, a nation that has experienced a rapid growth in their aquaculture. However, because of the lack of sufficient resources placed in the environmental sector, aquaculture is experiencing problems that are affecting the economic and social sectors. This proves that not only will the desired results create sustainability in the seafood industry of Myanmar, but also demonstrates the importance of finding a balance between each of the three sectors.

    Author(s): JULIO ANTONIO ARIAS
  • Sustainability is the intersection of the environmental, economic, and social sectors. A goal USAID project in Myanmar is to institutionalize sustainability in all three sectors of the seafood industry, especially the aquaculture. Myanmar is currently in a state of political, economic, and environmental turmoil, and a sustainable seafood industry and aquaculture would benefit the nation. The plan involves restoring invaluable aquatic natural resources, improving the supply chain and governance of the seafood industry, and creating stability through food security and social equity. The effects that each of these central goals of the project have on the country are guided through the principles that the GPO, a World Bank organization, uses in assessing programs with the goal of sustainability. The effects will also be confirmed through the comparison to Vietnam, a nation that has experienced a rapid growth in their aquaculture. However, because of the lack of sufficient resources placed in the environmental sector, aquaculture is experiencing problems that are affecting the economic and social sectors. This proves that not only will the desired results create sustainability in the seafood industry of Myanmar, but also demonstrates the importance of finding a balance between each of the three sectors.

    Author(s): JULIO ANTONIO ARIAS
  • Gaseous and liquid anaerobic digestion (AD) streams, currently are at best used for electricity and heat production or simply spreading at the fields, respectively. However, electricity and heat are economically produced from other renewables and advanced fertilizers are needed to avoid leaching and boost nutrients capture. Hence, AD seeks new opportunities to support circular bioeconomy. The overall objective of this review is to present state-of-the-art resource recovery routes for upcycling the AD streams to reduce carbon footprint and formulate alternative products to increase sustainability. Technical barriers and integrated systems to upcycle AD streams through biological means are presented. New technologies and methods to capture CH4, CO2 and nutrients from the digested residual resources are presented, as a) methanotrophs cultivation to be used as feed ingredients; b) CO2 conversion and micro-nutrients capturing from microalgae to be valorized for a wide range of applications (e.g. biofuels, food and feed, fertilizers, bioactive compounds); c) CO2 transformation to biodegradable plastics precursors (e.g. Polybutylene succinate, Polyhydroxyalkanoate); d) digestate valorization for biochar production to support efficient agricultural usage. Moreover, the environmental factors and life cycle assessment perspectives of the novel biorefinery routes are revised highlighting the need for regionalized models or assessments that can reveal the most sustainable routes based on local conditions and requirements. Despite AD poses some positive characteristics related to environmental benefit and emissions reduction, the present wo

    Author(s): Panagiotis Tsapekos, Benyamin Khoshnevisan, Merlin Alvarado-Morales, Xinyu Zhu, Junting Pan, Hailin Tian, Irini Angelidaki
  • The red seaweeds Gelidiella acerosa, Gracilaria edulis and G. crassa are used as raw materials for the production of agar by the seaweed industries in India. The demand of agar yielding seaweeds for the agar industries is more, but the quantity of G. acerosa and G. edulis exploited is less. G. edulis plants from Sri Lanka coast would have been drifted to this area by water current and it is for the first time such a large quantity of G. edulis isobserved.

    Author(s): Kalimuthu, S, Kaliaperumal, N
  • A PDF Power Point on BAL's "Unlocking the Sugars in seaweed to Produce Renewable Chemicals and Fuels".

    Author(s): BAL- bio architecture lab
  • As reported in other Pacific island communities and many countries around the world, wild stocks of sea cucumber in Fiji and Tonga are declining because of unsustainable levels of fishing. The Pacific Agribusiness Research for Development Initiative (PARDI) is a partnership involving the Secretariat of Pacific Community, the University of the South Pacific and a consortium of Australian universities, funded by the Australian Centre for International Agricultural Research. PARDI seeks to create sustainable livelihoods by identifying constraints to economic development in the Pacific islands region, and by developing appropriate technologies or products to resolve these constraints. It is currently evaluating the sea cucumber industry and its contribution to community livelihoods in Tonga and Fiji. This paper presents preliminary literature search findings of the PARDI study into sea cucumber market chains in these two Pacific island countries. Although an initial literature review revealed a scarcity of reliable information, interim maps of the current supply chains of both Fiji and Tonga have been developed and are discussed here. Research outcomes may lead to improvements in processing, value-adding to beche-de-mer and identification of new niche markets, and may facilitate investment in sea ranching and aquaculture.

    Author(s): Theo A. Simos
  • The coast of Jiangsu Province in China e where Ulva prolifera has always been firstly spotted before developing into green tides e is uniquely characterized by a huge intertidal radial mudflat. Results showed that: (1) propagules of U. prolifera have been consistently present in seawater and sediments of this mudflat and varied with locations and seasons; (2) over 50,000 tons of fermented chicken manure have been applied annually from March to May in coastal animal aquaculture ponds and thereafter the waste water has been discharged into the radial mudflat intensifying eutrophication; and (3) freefloating U. prolifera could be stranded in any floating infrastructures in coastal waters including large scale Porphyra farming rafts. For a truly integrated management of the coastal zone, reduction in nutrient inputs, and control of the effluents of the coastal pond systems, are needed to control eutrophication and prevent green tides in the future.

    Author(s): Feng Liu, Shaojun Pang, Thierry Chopin, Suqin Gao, Tifeng Shan, Xiaobo Zhao, Jing Li
  • The coast of Jiangsu Province in China e where Ulva prolifera has always been firstly spotted before developing into green tides e is uniquely characterized by a huge intertidal radial mudflat. Results showed that: (1) propagules of U. prolifera have been consistently present in seawater and sediments of this mudflat and varied with locations and seasons; (2) over 50,000 tons of fermented chicken manure have been applied annually from March to May in coastal animal aquaculture ponds and thereafter the waste water has been discharged into the radial mudflat intensifying eutrophication; and (3) free- floating U. prolifera could be stranded in any floating infrastructures in coastal waters including large scale Porphyra farming rafts. For a truly integrated management of the coastal zone, reduction in nutrient inputs, and control of the effluents of the coastal pond systems, are needed to control eutrophication and prevent green tides in the future.

    Author(s): Feng Liu, Shaojun Pang, Thierry Chopin, Suqin Gao, Tifeng Shan, Xiaobo Zhao, Jing Li

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