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Okazaki, Japan

University of Human Environments is a private university in Okazaki, Aichi, Japan, established in 2000. It has an associated private Junior High School and High School. Wikipedia.

Okada N.,Japan Forestry and Forest Products Research Institute | Okada N.,Kyoto University | Hirakawa Y.,Japan Forestry and Forest Products Research Institute | Katayama Y.,Kyoto University | Katayama Y.,University of Human Environments
Journal of Wood Science

Rubidium solution was injected in the sapwood of a Japanese cedar cultivar in the growing period, and its radial movement in stem was traced to investigate the accumulation of alkali metals in the heartwood. Sapwood-injected Rb was detected in outer heartwood at 10 days after the treatment, and continued increasing at 20 days after. Radial movement of Rb toward heartwood was considered to occur soon after the treatment, and to decline at a certain point of the time after Rb injection ceased. However, Rb continued moving in heartwood probably by diffusion even after the cease of Rb injection. In a series of injection experiment, radial movement of injected Rb is not corresponding to the seasonality of both cambial activity and cytological changes of ray parenchyma accompanied with heartwood formation. From the results on Rb's behavior, we conclude that accumulation of K and other alkali metals in heartwood of Japanese cedar has two steps, active transport from sapwood to outer heartwood via ray, and diffusion in heartwood, and that these processes proceed independently from both cambial activity and cytological changes of ray parenchyma. © 2011 The Japan Wood Research Society. Source

Mitoku K.,University of Human Environments | Masaki N.,The Japanese Red Cross Hiroshima College of Nursing | Ogata Y.,Fukuoka Prefectural University | Okamoto K.,Aichi Prefectural University
BMC Geriatrics

Background: Vision and hearing impairments among elders are common, and cognitive impairment is a concern. This study assessed the association of vision and hearing impairments with cognitive impairment and mortality among long-term care recipients. Methods: Data of 1754 adults aged 65 or older were included in analysis from the Gujo City Long-Term Care Insurance Database in Japan for a mean follow-up period of 4.7 years. Trained and certified investigators assessed sensory impairments and cognitive impairment using a national assessment tool. Five-level scales were used to measure vision and hearing impairments. Cognitive performance was assessed on two dimensions, namely communication/cognition and problem behaviors. We performed logistic regression analysis to estimate odd ratios (ORs) and 95 % confidence intervals (CIs) for the association of vision and hearing impairments with cognitive impairment. Using Cox proportional hazard regression models, we obtained hazard ratios (HRs) for mortality. Results: Of 1754 elders, 773 (44.0 %) had normal sensory function, 252 (14.4 %) vision impairment, 409 (23.3 %) hearing impairment, and 320 (18.2 %) dual sensory impairment. After adjusting for potential cofounders, ORs of cognitive impairment were 1.46 (95 % CI 1.07-1.98) in individuals with vision impairment, 1.47 (95 % CI 1.13-1.92) in those with hearing impairment, and 1.97 (95 % CI 1.46-2.65) in those with dual sensory impairment compared to individuals with normal sensory function. The adjusted HR of overall mortality was 1.29 (95 % CI 1.01-1.65) in individuals with dual sensory impairment and cognitive impairment relative to normal sensory and cognitive functions. Conclusions: Cognitive impairment was most common in individuals with dual sensory impairment, and those with dual sensory impairment and cognitive impairment had increased mortality. © 2016 The Author(s). Source

Changes in the flora and the individual number of flowering plants under Sika deer browsing were investigated at Makura-dani in Ashiu Experimental Forest, Kyoto Prefecture, Japan. The number of species decreased from 84 to 56. Among the 77 species evaluated, eight species increased and 47 species decreased conspiciously in number, probably resulting in the local extinction of 22 species. The rate of species loss was greater for large-sized plants and the rate of unchanged or less changed species was greater for small-sized plants. Summer or autumn flowering herbaceous species showed higher rates of decreased species number than spring flowering species. Therefore, plant size and flowering season were the important characteristics for evaluating the browsing effect. The estimated number of flowering individuals and the Simpson's diversity index showed distinctly different phenological patterns after Shika deer browsing, and the seasonal function of flowering plant community on herbivorous insects visiting flowers were supposed to have changed. Source

The aquatic plant genus Vallisneria, which includes several invasive species, is frequently used as ornamental plants in aquaria. Naturalized populations of Vallisneria have been discovered in Japan and are believed to have escaped from aquaria. We identified these naturalized Vallisneria using the internal transcribed spacer regions of nuclear ribosomal DNA (nrITS). Two accessions of nonnative Vallisneria were determined to have invaded into Japan: one is a hybrid between Vallisneria spiralis native to Eurasia and Vallisneria denseserrulata native to China and Japan, and another is Vallisneria australis native to Australia. The invasive nature of the former accession may have resulted from hybrid vigor. We also sequenced the nrITS regions of the accessions commercially traded in Japan. The two naturalized accessions were genetically identical to two of those circulating in the Japanese market as ornamental plants for aquaria. These invasive accessions propagate vegetatively and would profoundly influence native water ecosystems in Japan. We seek to arouse attention regarding the risks posed by these invasive Vallisneria in Japan, as well as other areas. © 2015 Elsevier B.V. Source

Takakura K.-I.,Japan Institute for Environmental Sciences | Takakura K.-I.,University of Shiga Prefecture | Fujii S.,University of Human Environments
Population Ecology

Theoretical studies have predicted that reproductive interference must exclude either of the interacting species, but no testing of this prediction has ever been reported for natural populations. This study surveyed the distribution patterns of herbaceous Veronica plants, including one native and three alien species, to test whether the invasion of the alien species exerting reproductive interference excluded the native species. Results showed that the native species was repeatedly excluded from islands where an alien species invaded, exerting reproductive interference, and that other alien species had no significant effect on the native population survival. This survey also demonstrated that the native species altered its habitat from the ground to stone walls on the mainland where the alien species had been predominant. In the mainland populations, the fruit morphology differed from that of the islands, and the morphology in the mainland population seemed suitable for seed dispersion by ants at a stone wall habitat. We also surveyed the genetic differentiation among populations, the results of which did not support the native species genetically differentiated between mainland and island populations before the alien species invasion. These results strongly suggest that the reproductive interference excluded the recipient species at the population level and facilitated the habitat change. Additionally, results indicated that a series of field surveys of islands close to the mainland can be a powerful tool to test the ecological importance of reproductive interference. © 2015, The Society of Population Ecology and Springer Japan. Source

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