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Fecampiid flatworms parasitic in a tanaidacean crustacean
No full textWe report the first record of fecampiidan platyhelminths parasitic in tanaidacean crustaceans. Two fecampiidans (0.75 mm and 1.10 mm in length) were found in a female of Pseudotanais sp. (Pseudotanaidae; 1.75 mm in length) collected at 794 m depth off the southern coast of Japan, northwestern Pacific. Fresh individuals were yellow or light yellow, but completely faded in ethanol. In a maximum likelihood tree based on 28S rRNA sequences, the parasite was placed in a moderately-supported Fecampiidae clade, suggesting it is a member of Fecampiidae. The 28S sequence from the parasite was 25.0%, 32.6%, and 35.5% divergent in Kimura 2-parameter (K2P) distance from Fecampia cf. abyssicola, Kronborgia cf. amphipodicola, and Kronborgia isopodicola sequences, respectively
Studies on the phenotypic impact of genotype and X-chromosome inactivation in females with X-linked Alport syndrome [an abstract of entire text]
No full text配架番号：2909この博士論文全文の閲覧方法については、以下のサイトをご参照ください。https://www.lib.hokudai.ac.jp/dissertations/copy-guides
細胞周期におけるDNA複製に関連する因子の研究 [全文の要約]
No full textこの博士論文全文の閲覧方法については、以下のサイトをご参照ください。【担当：理学部図書室】https://www.lib.hokudai.ac.jp/dissertations/copy-guides
異方性二分子膜ハイドロゲルの構造・変形・疲労挙動に及ぼす膨潤の効果
No full textRecently, soft and tough hydrogels have gained significant attention for their potential wide applications in wearable devices, stretchable electronics, and soft robotics. These long-term applications of soft materials demand a comprehensive understanding of their fatigue resistance mechanisms and structural evolution under cyclic loading conditions. The term "fatigue resistance" encompasses both fatigue damage and fatigue fracture. Fatigue damage refers to irreversible changes in the mechanical properties of unnotched samples under cyclic loading, while fatigue fracture involves crack propagation in notched samples under cyclic loading. In this study, we investigated fatigue resistance behaviors along with the structure properties and deformation of an anisotropic bilayer hydrogel composite featuring periodically stacked, polymerized non-ionic surfactant (PDGI, polydodecyl glyceryl itaconate) bilayers embedded within an elastic polyacrylamide (PAAm) hydrogel matrix. The bilayer’s structure combines high toughness and self-resilience under monotonic loading, attributed to efficient energy dissipation by the PDGI bilayers, which function as reversible sacrificial bonds. Along with these excellent functionalities, this composite PDGI/PAAm hydrogel exhibits tunable structural color upon one-dimensional swelling and as prepared PDGI/PAAm gel exhibits better mechanical properties compared to swollen one reported by Lama et. at. Therefore, the effects of 1-dimentional swelling on the structural evolution, mechanical deformation and fatigue behaviors of this gel are also systematically studied for the first time. In this study, the composite hydrogel composition was kept constant, and fatigue testing was conducted over a fixed stretch ratio range to evaluate the long-term mechanical response of the lamellar bilayers. Prior to fatigue test, the structural properties and deformation behavior of the gel under loading and swelling effects on these performances were thoroughly investigated. We also compare the fatigue and fracture parameters of PDGI/PAAAm gels with those of other tough gels to illustrate the level of fatigue fracture resistance that can be achieved through 8 varying mechanisms. This study might underscore the importance of the bilayer architecture in enhancing the durability of anisotropic hydrogel composites. These findings contribute to advancing the design of fatigue-resistant soft materials for diverse applications, including wearable devices, skin-like actuators, and soft robotics in dynamic environments
