1. Hydro-Responsive Curling of the Resurrection Plant Selaginella lepidophylla

    01:47

    from Ahmad Rafsanjani / Added

    106 Plays / / 0 Comments

    Hydro-Responsive Curling of the Resurrection Plant Selaginella lepidophylla Scientific Reports 5: 8064 (2015) | DOI: http://dx.doi.org/10.1038/srep08064 ABSTRACT The spirally arranged stems of the spikemoss Selaginella lepidophylla, an ancient resurrection plant, compactly curl into a nest-ball shape upon dehydration. Due to its spiral phyllotaxy, older outer stems on the plant interlace and envelope the younger inner stems forming the plant centre. Stem curling is a morphological mechanism that limits photoinhibitory and thermal damages the plant might experience in arid environments. Here, we investigate the distinct conformational changes of outer and inner stems of S. lepidophylla triggered by dehydration. Outer stems bend into circular rings in a relatively short period of desiccation, whereas inner stems curl slowly into spirals due to hydro-actuated strain gradient along their length. This arrangement eases both the tight packing of the plant during desiccation and its fast opening upon rehydration. The insights gained from this work shed light on the hydro-responsive movements in plants and might contribute to the development of deployable structures with remarkable shape transformations in response to environmental stimuli.

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    • FotoSintesi - CiternaOff 2012

      00:53

      from Giovanni Angeli / Added

      47 Plays / / 0 Comments

      Mostra fotografica di Viola Cangi e Serena Facchin. Si tratta di due progetti paralleli, focalizzati su una particolare visione del mondo, quella della coesistenza al di là della rispettiva natura: i soggetti passano in secondo piano, mimetizzandosi, per lasciar spazio a quello che li circonda e a ciò che non viene mai visto, se non nelle nostre menti e nella nostra fantasia. Giocare, unire, scoprire, amalgamare trasformandosi, processi, combustibile.

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      • 35 min

        03:08

        from Alejandra Aponte / Added

        32 Plays / / 0 Comments

        Inspirada en el corto ciclo de resurrección de la planta del género Selaginella.

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        • Rose of Jericho

          02:05

          from Sean Steininger / Added

          635K Plays / / 26 Comments

          A time lapse of a Rose of Jericho (Selaginella lepidophylla). After being exposed to water, the plant turns from a dried tumbleweed to a green fern over the course of several hours. Check out my behind the scenes interview with The Smithsonian: http://www.smithsonianmag.com/videos/category/video-contest/in-motion-workshop-rose-of-jericho/ Music: Alexandre Desplat - Morning tears

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