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  • 1. Kaur, S.
    et al.
    Srivastava, A.
    Kumar, Sanjiv
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience.
    Srivastava, Vaibhav
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience.
    Ahluwalia, A. S.
    Mishra, Y.
    Biochemical and proteomic analysis reveals oxidative stress tolerance strategies of Scenedesmus abundans against allelochemicals released by Microcystis aeruginosa2019In: Algal Research, ISSN 2211-9264, Vol. 41, article id 101525Article in journal (Refereed)
    Abstract [en]

    We studied the possible survival strategies of a green alga, Scenedesmus abundans, against allelochemicals secreted by Microcystis aeruginosa. We exposed the monoculture of S. abundans to a cell free-filtrate (allelochemicals)of M. aeruginosa at the start of our experiment and measured the growth behaviour, morphological changes and oxidative stress markers. The results suggest that exposure to allelochemicals induced oxidative stress in S. abundans, which had significantly reduced the growth of green alga with certain morphological changes. However, after seven days, S. abundans found ways to reduce oxidative stress by recovering its morphology and growth close to that of control. To understand possible survival strategies of test alga, we measured biochemical as well as protein level changes in S. abundans. Biochemical response of the green alga clearly showed that as a response to allelochemicals, enzymatic and non-enzymatic antioxidants were induced. Proteomic analysis showed that exposure to allelochemicals induced accumulation of 13 proteins on the 2-DE gel of S. abundans, which falls in three functional categories, i.e., (i)energy metabolism (photosynthesis, carbon fixation and respiration), (ii)ROS scavenging enzymes and molecular chaperones, and (iii)amino acid and protein biosynthesis. After chronic oxidative stress, these proteins presumably retained glycolysis, pentose phosphate pathway and turnover rate of the Calvin-Benson cycle. Moreover, these proteins assisted in the adequate detoxification of ROS and played an important role in the damage removal and repair of oxidized proteins, lipids and nucleic acids. Therefore, our study anticipates that S. abundans embraces biochemical and proteomic reprogramming to thrives against allelochemicals released by M. aeruginosa.

  • 2. van Oirschot, R.
    et al.
    Thomas, Jean-Baptiste
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Gröndahl, Fredrik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Fortuin, K. P. J.
    Brandenburg, W.
    Potting, José
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Environmental Strategies Research (fms).
    Explorative environmental life cycle assessment for system design of seaweed cultivation and drying2017In: Algal Research, ISSN 2211-9264, Vol. 27, p. 43-54Article in journal (Refereed)
    Abstract [en]

    Seaweeds are presently explored as an alternative source to meet the future protein demand from a growing world population with an increasing welfare level. Present seaweed research largely focuses on agri-technical and economic aspects. This paper explores directions for optimizing the cultivation, harvesting, transport and drying of seaweed from an environmental point of view. An environmental life cycle assessment (LCA) and detailed sensitivity analysis was made for two different system designs. One system design is featuring one layer of cultivation strips (four longlines side by side) interspaced with access corridors. The other system design is featuring a doubling of cultivation strips by dual layers in the water column. Impact profiles and sensitivity analysis showed that the most important impacts came from drying the harvested seaweed, and from the production of the chromium steel chains and polypropylene rope in the infrastructure. This indicates that caution should be used when designing cultivation systems featuring such materials and processes. Furthermore, the high-density productivity of the dual layer system decreases absolute environmental impacts and so found to be a little more environmentally friendly from a life cycle perspective.

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