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- 저자 : Hoshikawa Y (검색결과 17 건)
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Kiyochika Hoshikawa 韓國作物學會 1992 Korean journal of crop science Vol.37 No.2
Recently, a nursery mat made from rock wool has realized transplanting of the younger seedlings with the ordinary transplanting machines for Chibyo and Chubyo(3 and 4~5 leaved seedling, respectively). The seedlings defined as the 'Nyubyo' or 'Nursling seedlings' became possible to achieve economic profits from the reduction in both working time and costs. It being widely noticed as a strategy to solve the difficulties in current rice cultivation. The nursling seedlings are 1.4 to 2.5 leaves and height at 4.5 to 7cm, grown 4 to 7 days after seeding. They maintain still up to 50 to 80% of their nutrients in the endosperm, and can grow by using only their own nutrients for a certain period of time after transplanting. Nursling seedlings take 2 days in the nursery chamber at 32~circC after seeding, and 2 days in the greening house at 25~circC . This is only 4 days, all together, to make the nursling seedlings of 1.5 leaves which are ready for transplanting. Watering is only needed once at the sowing time. It only takes 1 or 2 waterings even to raise a seedlings for a period of 7 days. The number of nursery boxes can be reduced because it is possible to sow more densely(220 to 240g per box), thus it only needs seedlings of 15 to 16 boxes per 10 a which leads to a reduction in facilities and space needed. Temperature during the nursery period can be artificially adjusted more precisely which may lead to the prevention of temperature stress. The nursling seedlings can root rapid by because the crown roots from the coleoptile node begin to emerge immediately after transplanting. They show strong resistance to low temperature (12~circC ) and deep-planting. There is no danger in the rooting of the seedlings even if half of their height is buried into the soil. Moreover, it can root at a rate of up to 65 to 80% even if the full height of the seedlings is buried. They show also strong resistance to submergence (10~15cm). The nursling seedlings tend to grow by producing tillers from lower nodes. It is therefore, necessary to control to keep the proper numbers of tillers per unit area. They have no fear in the delay of heading and their yield components can be so well balanced that the same level of yield was achieved with the nursling seedlings compared to that with Chibyo. It was further suggested that if the surplus tillers can be avoided by such cultivation practices, the number of grain per panicle can be kept greater and higher yield can be realized. Practical experiments with the nursling seedlings conducted in 1989 and 1990 by farmers in various areas showed exciting results. The nursling seedlings will become widely spread, or at least occupy an important position in Japanese and also in Korean rice cultivation techniques.tivation techniques.
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Ken Hoshikawa,Ikuo Nakamura,Satoshi Endo,Shingo Mizuniwa,So Makabe,Hiroko Takahashi 한국식물생명공학회 2012 Plant biotechnology reports Vol.6 No.3
Genes encoding pathogenesis-related proteins,such as degrading enzymes of fungal cell wall polysaccharides,have been used to confer enhanced resistance to fungal pathogens of various plants. A new type of endo-bmannanase gene, amn5A, was isolated from alkaliphilic Bacillus strain (JAMB-602) found in deep-sea sediment. The AMN5A mannanase is active over a wide pH range (pH 7–10) and stable at high temperature. In this study,transgenic tobacco plants expressing the amn5A gene were generated using Agrobacterium-mediated transformation. Polymerase chain reaction (PCR) analysis revealed that the amn5A gene was integrated into the genome of transgenic tobacco plants. Southern blot analysis showed that transgenic plants contained 1–6 copies of amn5A transgenes in their genome. Expression of the amn5A transgene was confirmed by reverse transcription-PCR analysis. Leaf extracts from the transgenic plants showed degradation activity of Konjak mannan. Antifungal assay of detached leaves and in vitro whole plantlets indicated that transgenic plants expressing amn5A gene acquired enhanced resistance to the soil-borne pathogenic fungus, Fusarium oxysporum,compared to untransformed control plants.
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Kiyochika, Hoshikawa The Korean Society of Crop Science 1992 Korean journal of crop science Vol.37 No.2
Recently, a nursery mat made from rock wool has realized transplanting of the younger seedlings with the ordinary transplanting machines for Chibyo and Chubyo(3 and 4~5 leaved seedling, respectively). The seedlings defined as the 'Nyubyo' or 'Nursling seedlings' became possible to achieve economic profits from the reduction in both working time and costs. It being widely noticed as a strategy to solve the difficulties in current rice cultivation. The nursling seedlings are 1.4 to 2.5 leaves and height at 4.5 to 7cm, grown 4 to 7 days after seeding. They maintain still up to 50 to 80% of their nutrients in the endosperm, and can grow by using only their own nutrients for a certain period of time after transplanting. Nursling seedlings take 2 days in the nursery chamber at 32$^{\circ}C$ after seeding, and 2 days in the greening house at $25^{\circ}C$. This is only 4 days, all together, to make the nursling seedlings of 1.5 leaves which are ready for transplanting. Watering is only needed once at the sowing time. It only takes 1 or 2 waterings even to raise a seedlings for a period of 7 days. The number of nursery boxes can be reduced because it is possible to sow more densely(220 to 240g per box), thus it only needs seedlings of 15 to 16 boxes per 10 a which leads to a reduction in facilities and space needed. Temperature during the nursery period can be artificially adjusted more precisely which may lead to the prevention of temperature stress. The nursling seedlings can root rapid by because the crown roots from the coleoptile node begin to emerge immediately after transplanting. They show strong resistance to low temperature (12$^{\circ}C$) and deep-planting. There is no danger in the rooting of the seedlings even if half of their height is buried into the soil. Moreover, it can root at a rate of up to 65 to 80% even if the full height of the seedlings is buried. They show also strong resistance to submergence (10~15cm). The nursling seedlings tend to grow by producing tillers from lower nodes. It is therefore, necessary to control to keep the proper numbers of tillers per unit area. They have no fear in the delay of heading and their yield components can be so well balanced that the same level of yield was achieved with the nursling seedlings compared to that with Chibyo. It was further suggested that if the surplus tillers can be avoided by such cultivation practices, the number of grain per panicle can be kept greater and higher yield can be realized. Practical experiments with the nursling seedlings conducted in 1989 and 1990 by farmers in various areas showed exciting results. The nursling seedlings will become widely spread, or at least occupy an important position in Japanese and also in Korean rice cultivation techniques.tivation techniques.
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Measurement of Esophageal Nocturnal Baseline Impedance: A Simplified Method
( Yoshimasa Hoshikawa ),( Akinari Sawada ),( Shirley Sonmez ),( Kornilia Nikaki ),( Philip Woodland ),( Etsuro Yazaki ),( Daniel Sifrim ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.2
Background/Aims Mean nocturnal baseline impedance (MNBI) during multichannel intraluminal impedance pH-monitoring (MII-pH) reflects the status of esophageal mucosal integrity. MNBI is suggested as an adjunctive method to distinguish patients with true gastroesophageal reflux disease (GERD) from functional heartburn (FH) and might predict outcomes for anti-reflux treatment. However, current methodology for calculation of MNBI is time-consuming and subject to operator-dependent selection bias. We aim to simplify and provide a more objective method to calculate MNBI. Methods We retrospectively analyzed 100 MII-pH tracings from 20 patients with erosive reflux disease, 20 with non-erosive reflux disease (NERD), 20 with reflux hypersensitivity, 20 with functional heartburn (FH), and 20 healthy asymptomatic volunteers. We compared the current “conventional” MNBI analysis with our “simple” MNBI analysis measured by selecting the whole supine period using the impedance average calculation function in the MII-pH software. Results Absolute values were very similar and there was a strong correlation between conventional and simple MNBI values in the most distal channel in all groups (r ≥ 0.8, P < 0.001) including patients with increased supine acid reflux. Distal esophageal simple MNBI negatively correlated with acid exposure time (r = -0.695, P < 0.001). Patients with erosive reflux disease and NERD had lower simple MNBI values in the most distal channel compared to other groups (P < 0.001). With a cutoff value of 1785 ohms, simple MNBI can discriminate patients with GERD from those with reflux hypersensitivity and FH (sensitivity 80.0% and specificity 89.7%). Conclusion Simple MNBI analysis provides very similar values and has an excellent correlation with conventional MNBI analysis. (J Neurogastroenterol Motil 2020;26:241-247)
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Morioka,Takayuki,Motoyama,Nobuyuki,Hoshikawa,Hiroshi,Okada,Mitsumasa,Moniwa,Takeo 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
Reactions between radicals and dissolved substances, e.g., phosphate buffer, carbonate ions and trace organics were included in the SBH (staehelin, Buhler, Hoigne) aqueous ozone decomposition model. Ozone decomposition rate obtained in laboratory studies and the calculated rate by this extended SBH model agreed satisfactorily. Odorous compound and humic substances were also included in the extended SBH model. Numerical analysis on the decomposition rate of the odorous compound was in good agreement with the results of laboratory studies, i.e. the decomposition rate initially increased with increase in the concentration of humic substances; reached maximum; and then decreased with further increase in the concentration of humic substances. And the role of humic substances on the decomposition of the odorous compound by ozone was elucidated by the model.
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