Browsing by Author "Dalay M.C."

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    Antibacterial activity of volatile component and various extracts of Spirulina platensis
    (2004) Ozdemir G.; Karabay N.U.; Dalay M.C.; Pazarbasi B.
    The methanol, dichloromethane, petroleum ether, ethyl acetate extracts and volatile components of Spirulina platensis were tested in vitro for their antimicrobial activity (four Gram-positive, six Gram-negative bacteria and Candida albicans ATCC 10239). GC-MS analysis of the volatile components of S. platensis resulted in the identification of 15 compounds which constituted 96.45% of the total compounds. The volatile components of S. platensis consisted of heptadecane (39.70%) and tetradecane (34.61%) as major components. The methanol extract showed more potent antimicrobial activity than dichloromethane, petroleum ether, ethyl acetate extracts and volatile components. Copyright © 2004 John Wiley & Sons, Ltd.
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    Enhanced microalgal lipid production in internally illuminated airlift photobioreactor
    (Marine Technology Society Inc., 2019) Deniz I.; Demirel Z.; Imamoglu E.; Dalay M.C.
    Internal illumination systems are being considered for use as an alternative light supply technique in microalgal products. The main goal of the study was to analyze the roles of different light wavelengths in internally illuminated airlift photobioreactors (PBRs) providing the light energy in an efficient way for the biomass production, lipid yield, and fatty acid composition of Amphora capitellata. The maximum chlorophyll-a concentration per unit biomass (2.62 ± 0.16 mg L-1) was obtained under red light, which was only 14% higher than under blue light in internally illuminated airlift PBR, whereas low chlorophyll-a content was found under white light. Maximum specific growth rate of 0.317 day-1, which corresponded to a doubling time of 2.185 days, was obtained under red light for A. capitellata. It was found that lipid content increased with decreasing growth rate for A. capitellata. Palmitic acid (C16:0) and palmitoleic acid (C16:1) were the principal fatty acids accounting for between 31%-33% and 31%-32% of total fatty acids, respectively. It is important to underline that red and blue light spectrum ranges contribute to improved biomass growth, whereas white light has the potential to support lipid content of diatoms. © 2019, Marine Technology Society Inc.. All rights reserved.
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    A New Network for the Advancement of Marine Biotechnology in Europe and Beyond
    (Frontiers Media S.A., 2020) Rotter A.; Bacu A.; Barbier M.; Bertoni F.; Bones A.M.; Cancela M.L.; Carlsson J.; Carvalho M.F.; Cegłowska M.; Dalay M.C.; Dailianis T.; Deniz I.; Drakulovic D.; Dubnika A.; Einarsson H.; Erdoğan A.; Eroldoğan O.T.; Ezra D.; Fazi S.; FitzGerald R.J.; Gargan L.M.; Gaudêncio S.P.; Ivošević DeNardis N.; Joksimovic D.; Kataržytė M.; Kotta J.; Mandalakis M.; Matijošytė I.; Mazur-Marzec H.; Massa-Gallucci A.; Mehiri M.; Nielsen S.L.; Novoveská L.; Overlingė D.; Portman M.E.; Pyrc K.; Rebours C.; Reinsch T.; Reyes F.; Rinkevich B.; Robbens J.; Rudovica V.; Sabotič J.; Safarik I.; Talve S.; Tasdemir D.; Schneider X.T.; Thomas O.P.; Toruńska-Sitarz A.; Varese G.C.; Vasquez M.I.
    Marine organisms produce a vast diversity of metabolites with biological activities useful for humans, e.g., cytotoxic, antioxidant, anti-microbial, insecticidal, herbicidal, anticancer, pro-osteogenic and pro-regenerative, analgesic, anti-inflammatory, anti-coagulant, cholesterol-lowering, nutritional, photoprotective, horticultural or other beneficial properties. These metabolites could help satisfy the increasing demand for alternative sources of nutraceuticals, pharmaceuticals, cosmeceuticals, food, feed, and novel bio-based products. In addition, marine biomass itself can serve as the source material for the production of various bulk commodities (e.g., biofuels, bioplastics, biomaterials). The sustainable exploitation of marine bio-resources and the development of biomolecules and polymers are also known as the growing field of marine biotechnology. Up to now, over 35,000 natural products have been characterized from marine organisms, but many more are yet to be uncovered, as the vast diversity of biota in the marine systems remains largely unexplored. Since marine biotechnology is still in its infancy, there is a need to create effective, operational, inclusive, sustainable, transnational and transdisciplinary networks with a serious and ambitious commitment for knowledge transfer, training provision, dissemination of best practices and identification of the emerging technological trends through science communication activities. A collaborative (net)work is today compelling to provide innovative solutions and products that can be commercialized to contribute to the circular bioeconomy. This perspective article highlights the importance of establishing such collaborative frameworks using the example of Ocean4Biotech, an Action within the European Cooperation in Science and Technology (COST) that connects all and any stakeholders with an interest in marine biotechnology in Europe and beyond. © Copyright © 2020 Rotter, Bacu, Barbier, Bertoni, Bones, Cancela, Carlsson, Carvalho, Cegłowska, Dalay, Dailianis, Deniz, Drakulovic, Dubnika, Einarsson, Erdoğan, Eroldoğan, Ezra, Fazi, FitzGerald, Gargan, Gaudêncio, Ivošević DeNardis, Joksimovic, Kataržytė, Kotta, Mandalakis, Matijošytė, Mazur-Marzec, Massa-Gallucci, Mehiri, Nielsen, Novoveská, Overlingė, Portman, Pyrc, Rebours, Reinsch, Reyes, Rinkevich, Robbens, Rudovica, Sabotič, Safarik, Talve, Tasdemir, Schneider, Thomas, Toruńska-Sitarz, Varese and Vasquez.
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    Photobioreactor facade panels: enhancing comfort, reducing energy use, and capturing carbon in temperate continental climates
    (Springer Nature, 2025) Yaman Y.; Tokuç A.; Deniz İ.; Ezan M.A.; Köktürk G.; Dalay M.C.; Demirel Z.
    Buildings contribute around 37% to global carbon emissions, prompting a growing interest in innovative carbon capture technologies. Among these, the integration of microalgae-based photosynthesis into building facades has emerged as a promising solution. This approach offers multiple benefits, including carbon sequestration, reduced energy consumption, dynamic shading, and improved thermal regulation. This paper investigates the impact of integrating photobioreactor (PBR) facade elements, specifically on the south-facing facade of an office building in a temperate continental climate. The study evaluates the system’s effects on indoor thermal and visual comfort, energy production, and carbon dioxide (CO2) sequestration for three distinct PBR facade alternatives and compares them with a commercial curtain wall. The continuous PBR system varies in performance depending on production intensity, necessitating an initial optimization for thermal and visual comfort alongside energy use. Simulations were conducted using Rhinoceros/Grasshopper plug-ins, with optimization performed via the Octopus tool. The results, focusing on the Chlorella vulgaris algae strain, demonstrate that all facade configurations achieve a daylight performance exceeding 50% and meet desired thermal comfort levels. Although the energy generated by the PBR facade does not fully offset the building’s energy consumption, annual CO2 sequestration ranges from 84.87 kg to 770.13 kg. This study concludes that microalgae facades offer a viable strategy for enhancing a building’s energy performance and reducing CO2 emissions, without compromising occupant comfort. Additionally, the findings provide valuable insights for designers, researchers, investors and stakeholders and provides a payback period of these systems (16–24 years) for commercialization in the building industry. © Jiangnan University 2024.