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1.
T. Ona T. Sonoda K. Ito M. Shibata Y. Tamai Y. Kojima J. Ohshima S. Yokota N. Yoshizawa 《Wood Science and Technology》2001,35(3):229-243
Relationships between cell and pulp properties were investigated by examining the within-tree property variations in Eucalyptus camaldulensis and Eucalyptus globulus. Properties investigated included proportions of ray and axial parenchyma, thickness of cell walls and cell wall percentages.
The characteristics of the ray and axial parenchyma (their proportions and wall thickness) were found to have a significant
influence on all measured pulp properties, including paper strength properties. Multiple regression of pulp properties in
relation to cell properties revealed that nearly all measured pulp properties were explained by cell properties at the 1%
significance level. It was concluded, therefore, that all cell types are important for predicting pulp properties, and it
is strongly recommended that tree breeding programs for Eucalyptus include the measurement of all cell types.
Received 6 July 1999 相似文献
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Kazuya Iizuka Narumi Toya Jyunichi Ohshima Futoshi Ishiguri Naoko Miyamoto Mineaki Aizawa Tatsuhiro Ohkubo Chisato Takenaka Shinso Yokota 《Journal of Wood Science》2018,64(1):59-64
To utilize forest resources in areas affected by fallout from the Fukushima Daiichi Nuclear Power Plant accident, it is important to understand the mechanisms of 137Cs movement through the stem wood of contaminated trees. Understanding the mechanism of absorption and migration of 137Cs to stem wood is necessary for clues to the future prediction of the transition of 137Cs to xylem. In the present study, radial variations in 137Cs concentration were investigated in Japanese cedar (Cryptomeria japonica D. Don) trees collected 1 year and 10 months after the accident. Additionally, the relationship between 137Cs concentration and potassium (K) content was established. Trees with a higher moisture content and lower lightness value in heartwood tended to have a higher 137Cs concentration in the heartwood. In these trees, 137Cs concentration peaked at the heartwood–sapwood boundary and gradually decreased toward the pith. By contrast, K content within the heartwood remained nearly constant along the radial direction. The heartwood-to-sapwood ratio of 137Cs concentration was significantly positively correlated with that of K content. Based on these results, we suggest that 137Cs movement from sapwood to heartwood might be related to the K content ratio of heartwood and sapwood. 相似文献
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Genetic analysis and PCR-based identification of major <Emphasis Type="Italic">Fusarium</Emphasis> species causing head blight on wheat in Japan 总被引:1,自引:1,他引:0
Wen-Hsin Chung Hideo Ishii Kumiko Nishimura Michiyo Ohshima Toshitaka Iwama Hideaki Yoshimatsu 《Journal of General Plant Pathology》2008,74(5):364-374
Identifying the Fusarium species cause Fusarium head blight (FHB) and produces mycotoxins in wheat and other cereal is difficult and time consuming because of confusing
phenotypic classification systems. In Japan, the F. graminearum complex, F. culmorum, F. avenaceum, and Microdochium nivale predominantly cause FHB. The internal transcribed spacer (ITS) and 5.8S of rDNA, a partial sequence of β-tubulin and mitochondrial
cytochrome b (cytb) genes of the four species were PCR-amplified and analyzed. On the basis of the ITS, β-tubulin and cytb sequences, F. avenaceum and M. nivale are distinct from the F. graminearum complex and F. culmorum, whereas the F. graminearum complex is closely related to F. culmorum. Moreover, thiophanate–methyl-resistant isolates of the F. graminearum complex and F. culmorum did not have an amino acid substitution at amino acid codon 198 or 200 of β-tubulin. In contrast, very highly or highly thiophanate–methyl-resistant
isolates of M. nivale had Glu (GAG) substituted with Ala (GCG) or Lys (AAG) at codon 198, respectively. The allele-specific PCR assay was used
to identify the F. graminearum complex and F. culmorum, and these Fusarium species could be distinguished rapidly. 相似文献
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Pseurotins A1 (1) and A2 (2) were isolated from a culture broth of the fungal strain Aspergillus fumigatus WFZ-25 as stereoisomers of pseurotin A (3) in 2011. We also isolated 1 and 2 together with 3 from A. fumigatus OUPS-T106B-5 separated from the marine fish Mugil cephalus. In this study, we re-examined the stereochemistry of 1 and 2 using chemical transformation and the CD spectra, and found the relationship between the CD Cotton effect and the absolute configurations of 1 and 2, which led us to revise the stereostructure of pseurotin A2. 相似文献
6.
Jun Tanabe Akira Tamura Jyunichi Ohshima Kazuya Iizuka Shinso Yokota 《Scandinavian Journal of Forest Research》2017,32(1):39-44
With emphasis on tree breeding for wood quality in Picea jezoensis, we aimed to evaluate radial and between-family variations in the microfibril angle (MFA) of the S2 layer in the latewood tracheids in 10 open-pollinated families of 43-year-old P. jezoensis trees. In addition, the relationships between MFA/wood density with the modulus of elasticity (MOE) or modulus of rupture (MOR) were investigated. Significant differences in MFA between families were found from the pith toward the bark. MFA showed higher values around the pith area, although some families showed relatively lower values than others around this area. In addition, due to a larger coefficient of variations of MFA near the pith, the potential for juvenile wood MFA improvement may be greater compared with mature wood. MOE was correlated with MFA in juvenile wood and with wood density in mature wood, whereas MOR was mainly correlated with wood density at radial positions in both woods. Therefore, to improve the MOE and MOR of P. jezoensis wood, both MFA and wood density would be factors to consider in both juvenile and mature woods. On the other hand, there are indications that, only wood density would be an important criterion for improving mature wood properties. 相似文献
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We have evaluated four commercially available mold starters (SP-01, NY, M1, and “for kome miso”) for fermented fish pastes with the aim of determining the effect of different koji molds on the nutritional and sensory characteristics of the fermented product. Comparative studies among different fermented
fish and bean pastes were also conducted. Protein contents were considerably higher in the fermented fish pastes (22.7–24.1%)
than the fermented bean pastes (8.2–12.8%). Free amino acids, oligopeptides, organic acids, mineral content, and sensory scores
of the fermented fish pastes were superior to those of the bean pastes in terms of nutritional aspects. Sensory evaluation
of fermented fish and bean pastes clearly indicated that different koji molds used as starters had little effect on the taste of the fermented fish pastes. However, in terms of nutritional and
sensory characteristics, fermented fish pastes from trash fishes were found to be both commercially valuable and a potential
gain to food processing firms among the many new generic fermented food products becoming available. 相似文献
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