• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.73-82
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• 2001

The ESEM could be used in investigating the fibrous networks developed during handsheet-forming processes with the exception of the stages relating to the actual dispersion of the fibers and the drying of formed sheets. Also the cross-sectional images of swollen fibers were generated with the ESEM but the information given by the images was rarely fresh compared to the CLSM images. The LTSEM was extremely useful in generating images of the microfibrillar structure of a wet fiber with great resolution. However, pretreatment required in the LTSEM chamber was somewhat tedious due to the time consumed in sublimation of ice and sputter coating. For observation of lamellar structure of a hydrated fiber, the LTSEM exhibited greatly detailed structure with high resolution. Finally ESEM and LTSEM should be used in a finite field such as observation of surface morphology in detail.

• 한국잠사곤충학회지
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• 제42권2호
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• pp.99-103
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• 2000

This study was carried out to investigate incubating characteristics, LTSEM observation, nature of a disease of infected silkworms(bombyx mori), LD$\_$50/, optimum infective condition for mass production and infection percentage(%) on conservation periods. On the V8 media, the colony was 0.5∼2.0cm/8 days in diameter and white or slighty colored with a white fluffy to powdery appearance. The conidia was subglobos in shape, zig-zag appearance, 1-celled, hyaline and 3.2$\times$2.4 ㎛ in size on the average. The conidiophore was irregular grouped, hyaline, rounded or flask-shaped. The LD$\_$50/ values of the 2nd and 4th silkworms were each other 6.6142(Log) in natural temperature and humidity (25$\^{C}$, 65%). On optimum infective condition for mass production, all of preservation time(hr.) postinoculation in 1.0$\times$10$\^$8/ conidia/㎖ was over 97% and only 20 hr in 1.0$\times$10$\^$7/ condia/㎖ was over 90%.