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Ohtsuka, Yasuji

doi:10.1295/kobunshi.27.90

Cited by 8 publications

(5 citation statements)

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“…§1734 solely to indicate this fact. [31][32][33][34][35]39. *Color of the oil droplets contained in the principal member of double cones and in green-sensitive single cones appears to be different in the two genera of turtle, Geoclemys and Pseudemys (26,27).…”

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confidence: 99%

“…On the basis of cell shape and of color or fluorescence of their oil droplets, turtle photoreceptors are classified into seven types: four types of single cones, one type of double cone, and one type of rod. Each type of cone has been determined to have maximum sensitivity in either the red, or green, or blue region of the spectrum by intracellular staining (31,32,39) or by microspectrophotometry (33)(34)(35) (Table 1). In the present study, morphological criteria were used to identify the cell types.…”

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confidence: 99%

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gamma-Aminobutyric acid acts at axon terminals of turtle photoreceptors: difference in sensitivity among cell types.

Tachibana¹,

Kaneko²

1984

Proc. Natl. Acad. Sci. U.S.A.

111

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It has been proposed that horizontal cells of the vertebrate retina have a negative feedback synapse with cone photoreceptors. y-Aminobutyric acid (GABA) has been suggested to be a neurotransmitter of monophasic horizontal cells (a subtype of horizontal cells), which have direct connections with red-sensitive and green-sensitive cones. We have examined the feedback hypothesis by measuring the GABA sensitivity of photoreceptors. To eliminate interaction with other cells, we dissociated photoreceptors from the turtle retina enzymatically. The subtype of photoreceptors was identified unequivocally on the bases of the shape of the cell and the color of the oil droplets, which are known to correlate with the spectral sensitivity. Cells were voltage-clamped using "Giga-ohm sealed" suction pipettes in the whole-cell recording configuration, and membrane currents were measured in response to GABA applied ionophoretically at various positions on the cell. It was found that red-sensitive and green-sensitive cones were highly sensitive to GABA and that the sensitivity was localized at the axon terminals. GABA-sensitivity in blue-sensitive cones and in rods was very low. GABA-induced current reversed its polarity near the equilibrium potential of chloride, suggesting that GABA increased chloride conductance. Thus, our findings are consistent with the negative feedback hypothesis.

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confidence: 99%

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confidence: 99%

gamma-Aminobutyric acid acts at axon terminals of turtle photoreceptors: difference in sensitivity among cell types.

Tachibana¹,

Kaneko²

1984

Proc. Natl. Acad. Sci. U.S.A.

111

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“…Although detailed discussions are given in the literature,5–8 larger density, larger molecular refraction, and smaller molecular volume leads to larger refractive index, as shown in eqs. (1) and (2).…”

Section: Resultsmentioning

confidence: 99%

Optical material of high refractive index resin composed of sulfur-containing aliphatic and alicyclic methacrylates

Matsuda

Funae

Yoshida

et al. 2000

J. Appl. Polym. Sci.

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“…Although detailed discussions are given in the literature,5–8 larger density, a larger molecular refraction, and a smaller molecular volume lead to a larger refractive index as seen from eqs. (1) and (2).…”

Section: Resultsmentioning

confidence: 99%

Optical material of high refractive index resin composed of sulfur-containing aromatic methacrylates

Matsuda

Funae

Yoshida

et al. 2000

J. Appl. Polym. Sci.

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Cited by 8 publications

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gamma-Aminobutyric acid acts at axon terminals of turtle photoreceptors: difference in sensitivity among cell types.

gamma-Aminobutyric acid acts at axon terminals of turtle photoreceptors: difference in sensitivity among cell types.

Optical material of high refractive index resin composed of sulfur-containing aliphatic and alicyclic methacrylates

Optical material of high refractive index resin composed of sulfur-containing aromatic methacrylates

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