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동적가황된 NR/trans-Polyoctylene rubber / iPP 블렌드의 물성
양영철,장영욱 한국공업화학회 2000 응용화학 Vol.4 No.1
We have studied the effect of transpolyoctylene rubber(TOR) on the mechanical and thermal properties of thermoplastic elastomers from dynamically vulcanized natural rubber(NR)-isotactic polypropylene(iPP) blends. The addition of suitable amount of TOR into the rubber phase leads to the increase in tensile strength, modulus as well as ultimate strain. From dynamic mechanical analysis, it was found that the addition of TOR into the blends does not lead to any increase in compatibility of the NR and iPP. The increase in tensile properties is thought to be arised by the increase in elasticiy of the rubber phase and the decrease in sizes of rubber domain.
6-Aminonicotinamide 투여 후 햄스터 척수의 미세구조 변화
양영철,Yang, Young-Chul 한국현미경학회 1997 Applied microscopy Vol.27 No.3
The effects of antimetabolite, 6-aminonicotinamide (6-AN), on ultrastrudural changes in the spinal cord of golden hamster were investigated. Intraperitoneal administration of 6-AN (10 mg/kg body weight) every two days gave rise to a marked reduction of about $30\sim40%$ in body weight after $26\sim28$ days ($13\sim14th$ injection). In the lesions of the spinal cord, neuroglial cells such as astrocytes and oligodendrocytes were severely damaged, but neurons and blood vessels were not affected by 6-AN. The myelin sheath was also affected by 6-AN. Vacuoles observed in the lesions were produced by the swelling and degenerating changes of neuropils and neuroglial cells. Numerous swollen mitochondria and cisterns of rough endoplasmic reticulum were observed in the watery cytoplasm of damaged neuroglial cells, but intermediate filaments were well preserved. Especially in the damaged astrocytes, the outer nuclear membrane were partially swollen and formed a halfmoonlike structure. It is suggested that as well as the multivesicular bodies protruding from the swollen dendrites, the conjugation of adjacent vacuoles also participated in the formation of large vacuoles.