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351.
Stereocontrolled addition of carbon radicals to 4',5'-unsaturated uracil-nucleosides can be accomplished by using organoselenium reagents as a radical source. This provides a new method for C-C bond formation at the 5'-position. 相似文献
352.
Takahiko Amitsuka Maya Okamura Kei Mukuta Hiroko Shiibashi Kenji Haraguchi Tsukasa Saito 《Bioscience, biotechnology, and biochemistry》2017,81(8):1561-1568
Katsuodashi, a dried bonito broth, is very basic and indispensable in Japanese cuisine and contains taste-exhibiting components and unique aroma. We previously reported that its unique aroma contributes to the preference and reinforcement effect associated with dried bonito. This study aims to elucidate the contribution of aromatic components in Katsuobushi to preference formation and reinforcement effect. Volatile components obtained from dried bonito were fractionated and the fractions were subjected to two-bottle choice test. The fractionation test suggested that the component responsible for the preference is not one but comprises multiple components. In the GC–MS analysis/reconstruction test, solution with aromatic flavor narrowed down to 125 compounds had preference, and also had reinforcement effect. Moreover, GC–MS–olfactometry analysis narrowed down the candidate components to 28 out of 125. Mice showed preference for the test solution with aromatic flavor reconstructed with 28 components but did not show reinforcement behavior. 相似文献
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354.
H Kumamoto H Tanaka J Ogamino H Suzuki K Haraguchi T Miyasaka 《Nucleic acids symposium series》1999,(42):1-2
Naturally occurring ribonucleosides, uridine and adenosine, were converted to their 3'alpha-CH2CO2Me and 3'alpha-CH2PO(OPh)2 2',3'-dideoxy analogues. The present reaction sequence starts with oxidative cleavage of the 2',3'-cis-diol system, and involves radical-mediated reconstruction of furanose ring as the key step. 相似文献
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357.
We found transient hyperthyroidism in the course of hydrocortisone withdrawal in two patients who had undergone unilateral adrenalectomy to resect cortisol-hypersecreting adenoma. A 38-yr-old woman showed clinical thyrotoxicosis 3 months after the operation. Serum T4, T3 and TBG levels were 11.9 micrograms/dl, 310 ng/dl and 16.5 micrograms/ml, respectively. She was given methimazole (MMI) 15 mg/day for 4 weeks. After the cessation of MMI treatment, she eventually recovered to the euthyroid state. The other patient, a 34-yr-old man showed very mild clinical symptoms of hyperthyroidism 2 months after the operation. Serum T4, T3 and TBG levels were 10.4 micrograms/dl, 240 ng/dl and 14.5 micrograms/ml, respectively. In this case, no antithyroid drug was given. Two to three months after the onset of hyperthyroidism, he returned to the euthyroid state spontaneously. We carefully eliminated the possibility of factitious thyrotoxicosis in both cases. They had neither neck pain nor fever. Both had low radioactive iodine uptake by the thyroid. Therefore, we diagnosed them as painless thyroiditis induced after the resection of hypersecreting adrenal adenoma. 相似文献
358.
Akira Haraguchi 《Ecological Research》1992,7(3):205-212
A relationship was sought between species distribution and seasonal change in the redox property of peat in a floating mat
in Mizorogaike Pond, central Japan. The mat surface experienced an annual submergence-emergence cycle due to its sinking-rising
movement. Redox potential (Eh) of the surface peat showed little difference between communities in the mat in the submergence
season (January–June) and early emergence season (July–August). However variation in Eh among communities was clear in the
late emergence season (September–December). Among seven communities in the floating mat, theMenyanthes trifoliata-Rhynchospora fauriei, M. trifoliata-Eriocaulon sikokianum-E. bondoense f.pilosum, Sphagnum cuspidatum andM. trifoliata-Carex thunbergii communities had high Eh (400–600 mV) in the late emergence season, while theMenyanthes trifoliata andPhragmites australis-M. trifoliata communities had lower Eh (200–400 mV). TheM. trifoliata-Isachné globosa community was intermediate (300–500 mV). The earlier the emergence of the peat surface began, the higher the Eh became in
the late emergence season. 相似文献