1. ENDOSYMBIONT BESOS - Emergent Territories / IAAC

    10:24

    from Niel Parekh / Added

    73 Plays / / 0 Comments

    This is an Urbanism project by students(Niel Parekh, Pablo Marcet, Karl Francalanza) of masters in advanced architecture of Catalunia (IAAC), Barcelona. The site is in sant andria de Besos, along the river Besos. River Besos has a long history of from being one of very rich in terms of ecosystem to now one of the most polluted because of industrial waste. Thus Besos came back like a hungry endosymbiotic parasite. The proposal is about how to revive this deteriorated ecosystem using smart technologies. And along with improving ecosystem how to sustain building industry by using sustainable material available in surrounding ecosystem. This smart technology also empower people in the process of building their surrounding.

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    • Biology 05-1 Endosymbiotic Theory

      10:33

      from Sam Holloway / Added

      427 Plays / / 0 Comments

      This video explains some of the evidence that supports the theory that mitochondria and chloroplasts originated as independent, free-living, prokaryotic organisms.

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      • "Patterns in Nature," with Shoshanah Dubiner, on Like Wow #71

        27:00

        from Craig K. Comstock / Added

        39 Plays / / 0 Comments

        Artist Shoshanah Dubiner explains and shows her latest images, inspired by nature and life-energy. From cut-outs of dancers to the dark and brooding complexity of a cell, she explores exuberance visible on the human scale all the way down to life one can see only through a microscope. In "Miracle of Connecting," she places each of two lovers inside a Portugese Man of War jellyfish, which together drape fantastic tentacles into an undersea garden. In "Important Conversation," she shows us two people sitting on an underwater carpet and talking, as they are observed by huge fish. "Endosymbiosis," dedicated to the memory of the great biologist Lynn Margulis, shows bacterial life evolving through organisms combining, a phenomenon different than competition.

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        • Endosymbiosis: Its Impact on the Evolution of Life - Steve Massey, University of South Florida

          27:16

          from Kavli Frontiers of Science / Added

          141 Plays / / 0 Comments

          Characterization of a potential eukaryote to eukaryote horizontal gene transfer Steve Massey, University of South Florida Sacoglossan sea slugs participate in a type of cell-level symbiosis, termed kleptoplasty, whereby chloroplasts obtained from their algal food source are taken up by, and maintained inside, specialized gut cells. The two species of slugs we are studying, Elysia chlorotica and Elysia crispata, can maintain their chloroplasts in a functional state for several months. Under bright light the symbiotic chloroplasts photosynthesize, fixing carbon and evolving oxygen in the slug cell as if they were still in the algae. We are investigating the symbiosis at the protein and genetic levels, in order to understand the adaptations that allow the slugs to maintain chloroplast function for such extended periods of time. In particular, we have demonstrated that synthesis of chloroplast proteins continues for the duration of the symbiosis. Some of proteins synthesized in the slug chloroplasts appear to be photosynthetic proteins that are universally encoded by nuclear genes in algae and plants. Our pharmacological evidence indicates that indeed these proteins are synthesized in the slug cell from nuclear genes. So we are currently testing the slug for the presence of algal nuclear genes encoding photosynthetic proteins. Web addresses Solar powered sea slugs: http://www.seaslugforum.net/factsheet.cfm?base=solarpow Further references Pierce, S.K., Massey, S.E., Hanten, J.J., Curtis, N.E. 2003. Horizontal transfer of functional nuclear genes between multicellular organisms. Biol Bull 204, 237-240. Hanten, J.J., Pierce, S.K. 2001. Synthesis of several light-harvesting complex I polypeptides is blocked by cycloheximide in symbiotic chloroplasts in the sea slug, Elysia chlorotica (Gould): a case for horizontal gene transfer between alga and animal? Biol Bull 201, 34-44. Green, B.J., Li, W.Y., Manhart, J.R., Fox, T.C., Summer, E.J., Kennedy, R.A., Pierce, S.K., Rumpho, M.E. 2000. Mollusc-algal chloroplast endosymbiosis. Photosynthesis, thylakoid protein maintenance, and chloroplast gene expression continue for many months in the absence of the algal nucleus. Plant Physiol 124, 331-342. Mujer, C.V., Andrews, D.L., Manhart, J.R., Pierce, S.K., Rumpho, M.E. 1996. Chloroplast genes are expressed during intracellular symbiotic association of Vaucheria litorea plastids with the sea slug Elysia chlorotica. PNAS USA 93, 12333-12338. Pierce, S., Biron, R., Rumpho, M. 1999. Endosymbiotic chloroplasts in molluscan cells contain proteins synthesized after plastid capture. J Exp Biol 199, 2323-2330. Review Rumpho, M.E., Summer, E.J., Manhart, J.R. 2000. Solar-powered sea slugs. Mollusc/algal chloroplast symbiosis. Plant Physiol 123, 29-38.

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          • Endosymbiosis: Its Impact on the Evolution of Life - Katrin Henze, Heinrich Heine Universitaet Düsseldorf

            32:25

            from Kavli Frontiers of Science / Added

            246 Plays / / 0 Comments

            Hydrogenosomes- impact of an anaerobic relative of mitochondria on the endosymbiont hypothesis Katrin Henze, Heinrich Heine Universitaet Düsseldorf The origin of eukaryotic cells and their characteristic organelles, the mitochondria, is a hotly debated topic in evolutionary cell biology. General textbooks often present mitochondria as defining features of the eukaryotic cell, providing the cell with an efficient way to generate energy through an ATP-producing pathway that uses oxygen as a terminal electron acceptor. However, in habitats that do not contain sufficient oxygen to support aerobic ATP-production, eukaryotic organisms from several independent lineages have been detected which, instead of mitochondria, possess a different type of organelle called hydrogenosome. Hydrogenosomes lack the oxidative phosphorylation typical of mitochondria, but generate small amounts of ATP in a fermentative way through substrate level phosphorylation. Electrons generated in the process are used to produce H2 as the reduced endproduct. Extensive data support the hypothesis that hydrogenosomes and mitochondria, notwithstanding their morphological and metabolic differentness, are descendants from the same endosymbiotic bacterial ancestor. This makes hydrogenosomes and their anaerobic metabolism relevant to endosymbiotic theory. Traditional formulations of the endosymbiont hypothesis suggest that the endosymbiotic acquisition of aerobic mitochondria was driven by rising oxygen levels in the atmosphere, but do not account for anaerobic metabolism of hydrogenosomes as a putative heritage of the common bacterial ancestor of both organelles. To evaluate the significance of hydrogenosomes for the endosymbiont hypothesis, we need to determine whether their anaerobic proteins were retained from the common bacterial ancestor or acquired trough lateral gene transfer events.

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            • Endosymbiosis

              07:40

              from Jaani Kivinen / Added

              Short by Erno Aaltonen Hannu Aukia Jaani Kivinen Cast Pyry Nikkilä James Clay Anu Sinisalo Olli Toivonen Erno Aaltonen Part of Uneton48 2010 short film competition. http://www.uneton48.com/

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