Primary Photoprocesses Involved in the Sensory Protein for the Photophobic Response ofBlepharisma japonicum

2008 ◽  
Vol 112 (47) ◽  
pp. 15182-15194 ◽  
Author(s):  
Johanna Brazard ◽  
Christian Ley ◽  
Fabien Lacombat ◽  
Pascal Plaza ◽  
Monique M. Martin ◽  
...  
Keyword(s):  
Photophobic Response

scholarly journals Effect of light on aggregational behavior of planarian Dugesia tigrina

2017 ◽  
Author(s):  
Jaemin Lee
Keyword(s):  
Defense Mechanisms ◽  
Uv Light ◽  
Infrared Light ◽  
Light Sources ◽  
Initial Exposure ◽  
Dugesia Tigrina ◽  
Wide Range ◽  
Photophobic Response ◽  
Negative Effect ◽  
Effect Of Light

Introduction. Planarians are renowned for their regenerative ability due to pluripotent stem cells, as well as their peculiar photophobic response. However, few facts are known about their aggregational behavior. This study aims to reveal the effect of light on aggregational behavior. Reynierse (1966) suggested that light has a negative effect on the formation of aggregations. However, one of his objectives for aggregational behavior was inappropriate. This study reevaluated the effect of existence of light on aggregational behavior, as well as ascertained the effect of wavelength on the formation of aggregations. Methods. In this study, the ratio of individuals participating in aggregations was measured as a criterion to determine aggregational behavior. Aggregational behavior was measured after two hours from the initial exposure to different light sources. The behaviors under white LED light and under shade were compared, as well as the behaviors under five different light sources: infrared lamp, red, green, blue LED, and ultraviolet lamp. Results. The existence of light interfered the formation of aggregations (t-test, p < 0.0001), which supports the former study of Reynierse. Also, aggregational behavior differed under different wavelengths (ANOVA, p < 0.0001). Except for the infrared light which emitted a wide range of wavelengths, the behavior showed hierarchy: decreasing aggregational behavior in accordance with decreasing wavelength. UV light has the most significant negative effect on the formation of aggregations. Discussion. Exposure to light caused negative effects on performing aggregational behavior. Participation in aggregations appears to be influenced by photophobic response, especially under lights of short wavelength. Disintegrating aggregations under exposure to lights can potentially bring evolutionary benefit. This behavior possibly makes the aggregating planarians altogether exposed to a higher risk or predation, considering that they lack defense mechanisms. Planarians can lower the risk and continue the populations by disintegrating the aggregational behavior under the existence of UV and lights of higher wavelength, which are indicatives of daytime. Understanding aggregational behavior of animals of a lower order would give better insight on general herding behavior, and potentially help interpreting more complex behaviors of higher animals.

Action Spectrum for the Photophobic Response of Ciona intestinalis (Ascidieacea, Urochordata) Larvae Implicates Retinal Protein

1999 ◽  
Vol 70 (3) ◽  
pp. 359-362 ◽  
Author(s):  
Masashi Nakagawa ◽  
Takayuki Miyamoto ◽  
Mahito Ohkuma ◽  
Motoyuki Tsuda
Keyword(s):  
Action Spectrum ◽  
Ciona Intestinalis ◽  
Retinal Protein ◽  
Photophobic Response

Photosensory transduction in Euglena gracilis: Effect of some metabolic drugs on the photophobic response

1979 ◽  
Vol 120 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Corrado Barghigiani ◽  
Giuliano Colombetti ◽  
Francesco Lenci ◽  
Rosalba Banchetti ◽  
Maria Pia Bizzaro
Keyword(s):  
Euglena Gracilis ◽  
Photophobic Response

Localization of Blepharismin Photosensors and Identification of a Photoreceptor Complex Mediating the Step-up Photophobic Response of the Unicellular Organism, Blepharisma

1997 ◽  
Vol 65 (5) ◽  
pp. 915-921 ◽  
Author(s):  
Tatsuomi Matsuoka ◽  
Mie Sato ◽  
Mitsuru Maeda ◽  
Hideo Naoki ◽  
Takaharu Tanaka ◽  
...  
Keyword(s):  
Unicellular Organism ◽  
Photophobic Response

Quantitative studies on step-down photophobic response ofEuglena in an individual cell

PROTOPLASMA ◽  
1981 ◽  
Vol 106 (1-2) ◽  
pp. 37-48 ◽  
Author(s):  
T. Shimmen
Keyword(s):  
Individual Cell ◽  
Quantitative Studies ◽  
Photophobic Response ◽  
Step Down

ACTION SPECTRA OF THE PHOTOPHOBIC RESPONSE OF BLUE AND RED FORMS OF Blepharisma japonicum

1993 ◽  
Vol 57 (4) ◽  
pp. 686-689 ◽  
Author(s):  
Giovanni Checcucci ◽  
Giuseppe Damato ◽  
Francesco Ghetti ◽  
Francesco Lenci
Keyword(s):  
Action Spectra ◽  
Photophobic Response ◽  
Blepharisma Japonicum

CHARACTERISATION OF THE DIATOM PHOTOPHOBIC RESPONSE TO HIGH IRRADIANCE

2004 ◽  
Vol 19 (2) ◽  
pp. 167-179 ◽  
Author(s):  
Stanley A. Conn ◽  
Marlene Bahena ◽  
Julia T. Davis ◽  
Ryan L. Ragland ◽  
Carlton D. Rauschenberg ◽  
...  
Keyword(s):  
High Irradiance ◽  
Photophobic Response

Isolation and characterization of novelChlamydomonas mutants that display phototaxis but not photophobic response

1998 ◽  
Vol 41 (4) ◽  
pp. 353-362 ◽  
Author(s):  
Akiko Matsuda ◽  
Kenjiro Yoshimura ◽  
Oleg A. Sineshchekov ◽  
Masafumi Hirono ◽  
Ritsu Kamiya
Keyword(s):  
Isolation And Characterization ◽  
Photophobic Response
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