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Effects of light and darkness on cell deaths in damaged retinal ganglion cells of the carp retina

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Dezawa M., Mo X., Oshitari T., Takano M., Meyer-Rochow V. B., Sawada H., Eguchi E.

Acta Neurobiologiae Experimentalis

2001

vol. 61

issue 2

85-91

Effects of light and darkness on the apoptosis of retinal ganglion cells (RGCs) in young carp were measured by TUNEL method after transection of the optic nerve. Following the operation, the fish were kept under one of four regimens; constant darkness (DD), constant light (LL), 12 hr light and 12 hr dark (LD) and 3 hr of flickering light followed by 21 hr in the dark (FL). On day 3, the highest ratio of apoptotic RGCs was seen under conditions of DD, followed by LL, LD, and FL. On day 6, the percentages of apoptotic RGCs were lower under every experimental condition than what they had been earlier on day 3, but the same ranking order was maintained. Immunohistochemically it could be shown that phosphorylated ERKs were more intensively localized in FL rather than DD retinas. The results suggest that illumination regimens, and in particular cyclic diurnal light/dark changes, have an influence on the degree of apoptosis of damaged RGCs, and that inhibition of apoptosis is correlated with the higher expression of phosphorylated ERKs.

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)_{2}P_{2}O_{7-}

100%

Azuma M., Saito T., Hiroi Z., Takano M., Narumi Y., Kindo K.

Acta Physica Polonica A

2000

vol. 97

issue 1

205-208

The high-pressure phase of (VO)_{2}P_{2}O_{7} comprises a unique kind of spin-1/2 Heisenberg alternating antiferromagnetic chain, in contrast with the ambient pressure phase containing two crystallographically different chains. Magnetic susceptibility and high-field magnetization data showed the presence of a single spin gap of 23 (magnetization) ~27 (susceptibility) K, not double as observed for the ambient pressure phase. This result shows that the two kinds of chains of the ambient pressure phase have single, different spin gaps.

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1 Acta Neurobiologiae Experimentalis

1 Acta Physica Polonica A

1 2001

1 2000

2 Takano M.

1 Azuma M.

1 Dezawa M.

1 Eguchi E.

1 Hiroi Z.

1 Kindo K.

1 Meyer-Rochow V. B.

1 Mo X.

1 Narumi Y.

1 Oshitari T.

1 Saito T.

1 Sawada H.

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Effects of light and darkness on cell deaths in damaged retinal ganglion cells of the carp retina

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)_{2}P_{2}O_{7-}