최근 국내외 화장품과 식품산업에서 다양하게 사용되어 지고 있는 콜라겐 단백질 제품은 점차 그 용도와 특성에 따라 보다 고도화, 기능화 되어 가고 있다. 피부 건강의 지표인 콜라겐은 다양한 용도로 개발되어 사용되고 있으 며, 콜라겐의 소비가 증가함에 따라 용도에 적합한 최적 화된 콜라겐 제품의 개발이 중요한 연구 분야이다. 특히 여러 기업과 연구기관들에 의해서 콜라겐의 흡수율을 높 이기 위한 다양한 노력이 이루어지고 있다. 따라서 본 연 구에서는 프란즈(Franz) 세포 시스템을 이용하여 국내에서 판매되는 다양한 분자량별 콜라겐 제품의 경피 및 구강 상피세포 투과성을 비교하였다. 그 결과, 피부 표피/진피 조직과 비교하여 구강점막 조직의 콜라겐 흡수율이 분자 량 500달톤과 1,000달톤의 경우 모두 통계적으로 유의하 게(각각 약 10배, 2배) 높은 것으로 확인되었다. 또한, 분 자량별 구강점막 조직 흡수율을 비교한 결과, 분자량 500 달톤의 콜라겐이 분자량 1,000달톤 제품에 비해 흡수율이 2-3배 증가함을 확인하였다. 분자량 500달톤의 경우 Cmax 와 AUCt 값이 가장 높게 나타났으며, 피부 표피/진피 세 포에 비해 구강점막세포 시험군의 모든 지표가 높은 것으 로 나타났다. 본 연구 결과는 피부 흡수보다는 구강 점막 세포를 통한 콜라겐의 흡수방법이 콜라겐 체내 흡수증가 에 유효한 수단임을 시사하며, 분자량 1,000달톤 이하에서 도 보다 더 작은 500달톤의 저분자 콜라겐의 흡수율이 증 가되는 것으로 보아 콜라겐의 분자량이 흡수율 증가의 주 요한 요소임을 확인할 수 있었다.

Flexible transparent conducting films (TCFs) were fabricated by dip-coating single-wall carbon nanotubes (SWCNTs) onto a flexible polyethylene terephthalate (PET) film. The amount of coated SWCNTs was controlled simply by dipping number. Because the performance of SWCNT-based TCFs is influenced by both electrical conductance and optical transmittance, we evaluated the film performance by introducing a film property factor using both the number of interconnected SWCNT bundles at intersection points, and the coverage of SWCNTs on the PET substrate, in field emission scanning electron microscopic images. The microscopic film property factor was in an excellent agreement with the macroscopic one determined from electrical conductance and optical transmittance measurements, especially for a small number of dippings. Therefore, the most crucial factor governing the performance of the SWCNT-based TCFs is a SWCNT-network structure with a large number of intersection points for a minimum amount of deposited SWCNTs.

“Hwanggeumchal”, a new covered waxy cultivar derived from the cross between “Chalssalbori” and “Milyang 65” with waxy endosperm and early maturing cultivars, respectively was developed at Honam Agricultural Research Institute (HARI), NICS, RDA, 2006. The origin of “Hwanggeumchal” is “Suwon 403” (SB942090-B-B-B-42-1). The initial cross was made in 1994 and the selected line showed a high yield and good quality characteristics under yield trial test in 2003. “Suwon 403” consistently performed well for three years (2004-2006) from the four locations of regional yield trial (RYT) in Korea and released as “Hwanggeumchal”. The characteristics of “Hwanggeumchal” were the following: rate I growth habit, green leaf and stem, compact spike and with long rough awns. The heading date was April 30 in upland and April 28 in paddy field, which was 1 and 4 days later than that with check cultivar, “Seodunchalbori”. The culm length was 81 cm which was 3 cm shorter than those with check cultivar. It showed spike length of 4.5 cm and 633 spikes per m2, 64 grains per spike, 27.6 g of 1,000-grain weight and 632 g of test weight. It showed stronger winter hardiness and higher resistance to barley yellow mosaic virus (BaYMV) than those with check cultivar. It had yellow aleurone and showed higher water absorption, expansion rate and total phenol content than those of check cultivar, but lower protein, β-glucan content and pearling rate. The average yield of the pearled grain in the RYT was 4.04 ton ha-1 in upland and 4.12 ton ha-1 in paddy field, which was 10% higher and 4% lower than that of the check cultivar, respectively. This cultivar would be suitable for the area above the daily minimum mean temperature of -8℃ in January in Korean peninsula.

“Hyemi”, a new covered cultivar derived from the crosses between “Suwon 298” and “Milyang 34/Albori//Dongbori” developed at the Honam Agricultural Research Institute (HARI), NICS, RDA in 2006. The origin of “Hyemi” is “Suwon 400” (SB951032-B-B-B-28). The initial cross was made in 1995 and the selected line showed a high yield and good quality characteristics under yield trial test in 2003. “Suwon 400” consistently performed well for three years (2004-2006) from the four locations of regional yield trial (RYT) in Korea and released as “Hyemi”. The characteristics of “Hyemi” were the following: rate Ⅳ growth habit, green leaf and stem, compact spike and with long rough awns. The heading date was April 29 in upland and April 23 in paddy field, which was similar and 2 days earlier than that with check cultivar, “Olbori”. The culm length was 81 cm which was 4 cm shorter than those with check cultivar. It showed spike length of 4.1 cm and 646 spikes per m2, 52 grains per spike, 33.4 g of 1,000-grain weight and 672 g of test weight. It showed similar winter hardiness and higher resistance to barley yellow mosaic virus (BaYMV) than those with check cultivar. It showed higher protein content, whiteness and total phenol content than those of the check cultivar, but lower β-glucan content and pearling rate. The average yield of the pearled grain in the RYT was 3.95 ton ha-1 in upland and 4.38 ton ha-1 in paddy field, which was 13% and 16% higher than that of the check cultivar, respectively. This cultivar would be suitable for the area above the daily minimum mean temperature of -8℃ in January in Korean peninsula.