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Efficiency of Phototransduction Cascade in Carp Cones
Tachibanaki, Shuji,Tsushima, Sawae,Kawamura, Satoru Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
In the vertebrate retina, rods mediate twilight vision and cones daylight vision. Rods have been purified easily from the retina, and thus the phototransduction mechanism in rods is now well documented. However, it has not been possible to purify cones in large quantities, and therefore, the knowledge on the mechanism in cones is limited. Here we report purification of carp (Cyprinus carpio) cones with a stepwise Percoll gradient. Using purified cells, we compared the phototransduction mechanism between rods and cones. The results showed that both transducin activation and phosphodiesterase activation are less effective, and visual pigment phosphorylation is faster in cones. These differences explain lower light-sensitivity and briefer photoresponse time course in cones.
Shinya Nagasaki,Takumi Saito,Satoru Tsushima,Jared Goguen,Tammy Yang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
The interaction of NpO+ 2 with Cl- was studied using visibleenear-infrared spectroscopy in NaCl-Ca- Cl2-NaClO4, NaCl-NaClO4, and CaCl2-NaClO4 solutions with ionic strength (I) of 6M. The spectra of NpO+2 around 980 nm varied with Cl- concentration in the NaCl-CaCl2-NaClO4 and NaCl-NaClO4 solutions at [Cle] ≥ 3.5M, but not in the CaCl2-NaClO4 solution. Assuming the 1:1 interaction between NpOþ+ and Cl-, the apparent equilibrium constants at I = 6M were evaluated. The presence of Ca2+ was found to destabilize overall interaction between NpOþ 2 and Cle. The observations were consistent with the density functional theory calculation.