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Start Over Creator Koyama, Y.

1. In vitro receptor autoradiography: a map for exploring the hypothalamus

Creator:
Matsumura, K., Watanabe, Y., Onoe, H., and Koyama, Y.
Type:
article, model:article, and TEXT
Subject:
prostaglandin receptors, hypothalamus, and fever
Language:
English
Description:
In rabbits and guinea pigs, hypothalamic sites for prostaglandin Ej (PGE2) action were studied by means of in vitro receptor autoradiography. The density of PGE2 binding sites (probably PGE2 receptors) was the highest in the anterior wall of the third ventricle (A3V). This result is consistent in all mammalian species ever studied, suggesting a fundamental role of the A3V in the hypothalamic action of PGE2, such as fever.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Spectroscopic properties and temperature induced electronic configuration changes of all-trans and 15-cis β-carotenes in ionic liquids

Creator:
Bialek-Bylka, G. E., Pawlak, K., Jazurek, B., Skrzypczak, A., and Koyama, Y.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
1-methyl-3-octyloxymethylimidazolium tetrafluoroborate, 15-cis, all-trans β-carotene, electronic absorption, and fluorescence
Language:
Multiple languages
Description:
The clear vibrational structure of fluorescence spectrum of β-carotene in the solvent is reported for the first time at room temperature. This finding is in good agreement with recently discovered covalent 3 1Ag- new carotenoid state. The fluorescence yield of β-carotene in ionic liquid (1-methyl-3-octyloxymethylimidazolium tetrafluoroborate) is around hundred times higher than in standard solvent n-hexane. The all-trans and 15-cis β-carotene fluorescence yields in ionic liquid are 1.96±0.03 and 2.53±0.03 %, respectively. The ionic liquid is a very useful tool for modelling photosynthetic system in situ. We present the electronic absorption data of β-carotene in ionic liquids (so called neoteric solvents) with special interest in the absorption changes as a function of temperature in the range 0-90 °C (273-363 K). Ionic liquids are also very good medium for temperature study, because they are not changing up to several hundred °C and also not evaporating during heating. The relationship between spectral characteristics of β-carotene in new generation solvents with increasing and decreasing temperature is evaluated. The energy value of the ionic state 1 1Bu+ of synthetic β-carotene in ionic liquids exhibits a linear and temperature reversible dependence on temperature up to 30 °C (303 K) and up to 40 °C (313 K) for 15-cis and all-trans β-carotenes, respectively. This is valid for both 0-0 and 0-1 transitions. and G. E. Bialek-Bylka ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public