Fototaksja
Fototaksja – jedna z taksji, jest to zjawisko reakcji na świetlne bodźce[1]:
3-dniowe larwy pierścienicy Platynereis dumerilii wykazują mieszaną fototaksję (negatywą lub pozytywną), zależną od długości fali stymulującego światła (fotoreceptory mogą odgrywać rolę optycznego głębokościomierza)[2]
Ukierunkowany ruch rozcieńczonej zawiesiny syntetycznych mikrocząstek (średnica 2,7 μm)[3]
- fototaksja dodatnia – występuje podczas ruchu do światła,
- fototaksja ujemna – występuje podczas ruchu w stronę przeciwną.
Zjawisko fototaksji u roślin następuje w chloroplastach.
Zobacz też
Przypisy
- ↑ fototaksja, [w:] Encyklopedia PWN [online] [dostęp 2012-12-24].
- ↑ Csaba Verasztó, Martin Gühmann, Huiyong Jia, Vinoth Babu Veedin Rajan, Luis A Bezares-Calderón, Cristina Piñeiro-Lopez, Nadine Randel, Réza Shahidi, Nico K Michiels, Shozo Yokoyama, Kristin Tessmar-Raible, Gáspár Jékely (Max Planck Institute for Developmental Biology, Germany; University of Exeter, United Kingdom; Emory University, United States; University of Vienna, Austria; University of Tübingen, Germany). Ciliary and rhabdomeric photoreceptor-cell circuits form a spectral depth gauge in marine zooplankton. „eLife”, May 29, 2018. eLife Sciences Publications. ISSN 2050-084X (ang.).
- ↑ Celia Lozano, Borge ten Hagen, Hartmut Löwen, Clemens Bechinger. Phototaxis of synthetic microswimmers in optical landscapes. „Nat Commun”, 2016 Sep 30. DOI: 10.1038/ncomms12828 (ang.).
Media użyte na tej stronie
Behavioral-responses-of-Platynereis dumerilii-larvae-to-UV-light-380-nm-from-above-elife-36440-video2.webm
Autor: Csaba Verasztó, Martin Gühmann, Huiyong Jia, Vinoth Babu Veedin Rajan, Luis A. Bezares-Calderón, Cristina Piñeiro-Lopez, Nadine Randel, Réza Shahidi, Nico K. Michiels, Shozo Yokoyama, Kristin Tessmar-Raible, Gáspár Jékely, Licencja: CC BY 4.0
Behavioral responses of Platynereis dumerilii larvae to UV-light (380 nm) from above.
Autor: Csaba Verasztó, Martin Gühmann, Huiyong Jia, Vinoth Babu Veedin Rajan, Luis A. Bezares-Calderón, Cristina Piñeiro-Lopez, Nadine Randel, Réza Shahidi, Nico K. Michiels, Shozo Yokoyama, Kristin Tessmar-Raible, Gáspár Jékely, Licencja: CC BY 4.0
Behavioral responses of Platynereis dumerilii larvae to UV-light (380 nm) from above.
The magenta square in the top corner marks when the UV-light was switched on. The tracks are color-coded based on heading direction (red, upward; blue, downward). The Video is sped up 2x.
DOI:
https://doi.org/10.7554/eLife.36440.017
Phototaxis-of-synthetic-microswimmers-in-optical-landscapes-ncomms12828-s1.ogv
Autor: Lozano C, ten Hagen B, Löwen H, Bechinger C, Licencja: CC BY 4.0
Supplementary Movie 1 It shows the directed motion of a dilute suspension of synthetic photo-active microparticles (2.7 μm diameter) in a light profile with period length L = 33.5 μm, segment length ratio a/b = 0.22 and modulation amplitude ΔI = 1.0 μW/μm2 (top), 0.7 μW/μm2 (middle), 0.2 μW/μm2 (bottom). Under the imposed light field, the active colloids align with the +x-direction. At smaller amplitudes ΔI, the degree of alignment decreases, which leads to a reduction of the directed motion. Moreover, as visible in the movie, around the minima of I(x) the particles perform a back and forth motion due to opposite torques. With increasing ΔI, the velocity variations become smaller and an almost steady particle motion is observed. The movie is in real time.
Autor: Lozano C, ten Hagen B, Löwen H, Bechinger C, Licencja: CC BY 4.0
Supplementary Movie 1 It shows the directed motion of a dilute suspension of synthetic photo-active microparticles (2.7 μm diameter) in a light profile with period length L = 33.5 μm, segment length ratio a/b = 0.22 and modulation amplitude ΔI = 1.0 μW/μm2 (top), 0.7 μW/μm2 (middle), 0.2 μW/μm2 (bottom). Under the imposed light field, the active colloids align with the +x-direction. At smaller amplitudes ΔI, the degree of alignment decreases, which leads to a reduction of the directed motion. Moreover, as visible in the movie, around the minima of I(x) the particles perform a back and forth motion due to opposite torques. With increasing ΔI, the velocity variations become smaller and an almost steady particle motion is observed. The movie is in real time.