• Journal of Microbiology and Biotechnology
• /
• 제11권4호
• /
• pp.585-591
• /
• 2001

To compare the p10 promoter activity of Bombyx mori nucleopolyhedrovirus (BmNPV)K1 and K4, recombinant viruses Bm101-LacZ and Bm104-LacZ with a lacZ gene under the control of each p10 promoter were constructed. The $\beta$-galactosidase activity due to Bm101-LacZ was about 5.5- and 1.1-fold higher than that due to Bm104-LacZ and BmK1-LacZ, respectively. expressing ${\beta}$-galactosidase under the control of a polyhedrin promoter. The recombinant virus BmK1-104LacZ with the same genome structure as Bm101-LacZ, except for a p10 promoter region, produced a similar ${\beta}$-galactosidase activity to that due to Bm104-LacZ and 5.5-fold lower than that due to Bm101-LacZ. The virus yield, expression level of polyhedrin, and polyhedra productivity for each recombinant virus was almost similar. These results suggested that the difference in the expression level of ${\beta}$-galactosidase resulted from a difference in the p10 promoter regions, and that an expression vector using the p10 promoter of BmNPV-K1 could be usefully exploited in the mass production of foreign proteins with silkworm larvae by means of oral ingestion.

• Asian-Australasian Journal of Animal Sciences
• /
• 제16권10호
• /
• pp.1535-1539
• /
• 2003

Four microsatellite DNA loci BM1818, BM1258, BM1443 and BM1905 associated with the somatic cell counts (SCC) in cow milk were analyzed for genetic variation in 240 Beijing Holstein cows. The PCR amplified products of microsatellites DNA were detected by non-denatured polyacrylamide gel electrophoresis. The number of alleles for BM1818, BM1258, BM1443 and BM1905 were 4, 5, 8 and 6 in Beijing Holstein cows, respectively. The allele size ranges for BM1818, BM1258, BM1443 and BM1905 were 274 bp to 286 bp, 92 bp to 106 bp, 154 bp to 170 bp and 187 bp to 201 bp, respectively. The polymorphism information content/effective number of alleles/heterozygosity for BM1818, BM1258, BM1443 and BM1905 were 0.3869/1.7693/0.4348, 0.5923/2.9121/0.6566, 0.7114/3.9012/0.7437 and 0.5921/2.8244/0.6459. These data showed the microsatellite DNA locus BM1443 has the highest variability, followed by BM1258, BM1905 and BM1818. The results of the least squares means analysis showed as follows: the least squares mean of SCC for BM1818 284 bp/284 bp was significantly lower than that for BM1818 286 bp/286 bp (p<0.05). The least squares mean of SCC for BM1258 100 bp/100 bp was significantly lower than that for BM1258 102 bp/102 bp, 106 bp/106 bp, 106 bp/104 bp, 106 bp/102 bp, 106 bp/100 bp, 104 bp/100 bp (p<0.05). The least squares mean of SCC for BM1443 166 bp/160 bp and 166 bp/166 bp was significantly lower than that for BM1443 170 bp/160 bp, 160 bp/157 bp, 165 bp/160 bp (p<0.05). The least squares mean of SCC for BM1905 187 bp/187 bp was significantly lower than that for BM1905 197 bp/195 bp, 193 bp/187 bp (p<0.05).

• International Journal of Industrial Entomology and Biomaterials
• /
• 제46권1호
• /
• pp.16-23
• /
• 2023

The silkworm's dormancy and embryonic development are accomplished through the interaction of various genes. Analysis of the expression of several interacting genes can predict the embryonic stage of silkworms. In this study, we analyzed the changes in the expression level of genes at each stage during the embryonic development of dormant silkworm eggs and selected genes that can predict the hatching time. Jam123 and Jam124 silkworms were collected after egg laying, and the silkworm eggs were preserved using a double refrigeration method and expression analysis was performed for 23 genes during embryogenesis. There were 5 genes showing significant changes during embryogenesis: UDP-glucuronosyltransferases (BmUGTs), heat shock protein hsp20.8 (BmHsp20.8), Cytochromes b5-like proteins (BmCytb5), Krüppel homolog 1 (BmKr-h1), and cuticular protein RR-1 motif 41 (BmCpr41). As a result of quantitative comparison of the expression levels of these 5 genes through real-time PCR, the BmUGTs gene showed a difference between Jam123 and Jam124, making it difficult to see it as an indicator for predicting hatching time. However, the BmHsp20.8 gene had a common expression decreased at the imminent hatching stage. In addition, it was confirmed that the expression level of the BmCytb5 gene decreased to the lowest level at the time of imminent hatching, and the expression of the BmKr-h gene was made only at the time of imminent hatching. The expression of the last BmCpr41 gene can be confirmed only at the time of imminent hatching, and it was confirmed that it shows a rapid increase right before hatching. Taken together, these results suggest that expression analysis of BmHsp20.8, BmCytb5, BmKr-h1, and BmCpr41 genes can determine the stage of embryogenesis, predict hatching time, which facilitate better management of silkworm eggs.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제17권1호
• /
• pp.121-124
• /
• 2008

The caspase family proteins play an important role in programmed cell death (apoptosis). To date, the expression profiles of the caspase family genes in Bombyx mori (Bm) are poorly known. In this study, we examined the expression profiles of two novel Bm caspase family genes (ice-2 and ice-5), the potential change of the mitochondrial membrane and the morphology in Bm cells after stimulation of ultraviolet (UV) irradiation. The results showed the potential change of the mitochondrial membrane occurred at 5 hours after UV irradiation treatment. Analysis of fluorescent quantitative RT-PCR demonstrated that both the ice-2 and ice-5 might be involved in UV induced apoptosis in Bm cells. Notably, after UV irradiating, expression pattern of ice-2 and ice-5 were remarkably different. The ice-2 gene was highly expressed at two time points, 0.5 and 5 hours after UV stimulating, while the expression level of ice-5 only peaked at 5 hours after UV stimulating. It indicated that apoptosis induced by UV irradiation was involved in the mitochondrial pathway and the two isoforms of Bm ice may act but play different role during the apoptosis of Bm cells.

• 한국식품영양과학회지
• /
• 제43권9호
• /
• pp.1317-1324
• /
• 2014

본 연구에서는 울금 20% 주정 추출물이 LP-BM5 MuLV에 감염된 MAIDS 모델에서 면역조절 효과를 확인하기 위해 cytokines 생산, 혈장 면역글로불린 농도, T 세포 및 B 세포의 증식능, NK 세포의 활성능을 측정하였다. 그 결과 LPBM5 MuLV 감염으로 인하여 감소된 T 세포 및 B 세포의 증식능, NK 세포의 활성능을 울금 20% 주정 추출물 식이 투여가 증가시켰으며, Th1 type cytokines(IL-2, IFN-${\gamma}$)의 생성량을 증가시키고 Th2 type cytokines(IL-4, IL-10)은 억제시킴으로써 Th1/Th2 type cytokine 발현을 조절하여 면역 항상성을 유지하는 효과를 보였다. 따라서 울금은 면역조절 효과를 가진 천연 기능성 소재로서의 가능성을 기대할 수 있다.

• 한국전자파학회논문지
• /
• 제18권9호
• /
• pp.1030-1038
• /
• 2007

본 논문에서는 유럽에서 사용되는 GSM-900/GSM-1800 대 역 에 대 한 전자파 강도 측정 결과를 제시한다. 측정결과, 부산 기장군 장안읍 기룡 마을과 철마면 소산벌 두 곳이 후보지로 선정되었다. 두 후보지에서 수직 편파가 수평 편파보다 약 12 dBm이 더 높았으며, 번화가보다 25 dBm 낮게 측정되었다. 셀룰러/GSM-900 대역에서 측정한 수직 편파의 강도의 최대값은 각각 기룡 마을에서 -65 dBm, 소산벌에서 -69 dBm이다. PCS/GSM-1800 대역에서의 결과로는 각각 기룡 마을이 최고 -90.5 dBm, 소산벌은 -85 dBm이다. 두 후보지에서 수신된 전자파 강도가 -65 dBm 이하로 매우 약하다는 것을 확인하였으며, GSM 주파수 대역의 신호가 기존 시스템에 간섭 영향을 끼치지 않아 GSM 모바일 필드 테스트를 위한 적합한 장소로 사료된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제23권7호
• /
• pp.946-951
• /
• 2010

The objective of this research was to evaluate the effects of dietary supplementation of blood meal (BM) as a source of histidine, and magnesium oxide (MgO) as a catalyst of carnosine synthetase, on carnosine (L-Car) content in the chicken breast muscle (CBM), laying performance, and egg quality of spent old hens. Four hundred eighty laying hens (Hy-Line$^{(R)}$ Brown), 95wk old, were allotted randomly into five replicates of six dietary treatments: T1; 100% basal diet, T2; 100% basal diet+MgO, T3; 97.5% basal diet+2.5% BM, T4; 97.5% basal diet+2.5% BM+MgO, T5; 95% basal diet+5% BM, T6; 95% basal diet+5% BM+MgO. Magnesium oxide was added at 0.3% of diets. The layers were fed experimental diets for 5wk. There were no significant differences in the weekly L-Car content in CBM among all treatments during the total experimental period, but some of the contrast comparisions showed higher L-Car in CBM of T6. The L-Car contents linearly decreased (p<0.01 or p<0.05) as the layers got older except in T4 (p>0.05). There were significant differences in egg weight (p<0.01) and soft and broken egg ratio (p<0.05). The control (T1) was highest in egg weight and T6 was lowest in soft and broken egg ratio. Among the parameters of egg quality, there were significant differences in eggshell strength (p<0.01) and egg yolk color (p<0.05). Magnesium oxide supplementation increased the eggshell strength and BM tended to decrease egg yolk color. Eggshell color, eggshell thickness, and Haugh unit were not influenced by BM and MgO. In conclusion, BM and MgO did not significantly influence the L-Car in CBM of spent layers. The L-Car content rapidly decreased as the layers became senescent. Eggshell strength was increased by MgO supplementation.

• 한국정보통신학회논문지
• /
• 제23권7호
• /
• pp.807-815
• /
• 2019

본 논문에서는 RF CMOS 180-nm 공정을 이용하여 무선 통신 기기에서 quad-band를 지원하기 위한 전력 증폭기를 설계하였다. 제안한 전력증폭기는 low-band인 0.9,1.8,2.4 GHz 와 high-band인 5 GHz 로 구성되어있으며, 각각 입력 정합회로에서는 스위치를 사용하지 않는 구조를 제안하였다. 그리고 최대 선형 전력 확보를 위해 출력 정합회로는 각 주파수 대역에서의 전력 정합지점으로 임피던스 변환을 진행하였다. 제안한 전력증폭기는 무선 통신 변조 신호를 사용하여 검증하였다. Long-term evolution(LTE) 10 MHz 변조 신호를 이용하여 0.9 GHz 및 1.8 GHz 를 측정하였으며, 이때 출력 전력은 각각 23.55 dBm 및 24.23 dBm으로 측정 되었고, 20 MHz 변조 신호를 사용한 경우, 1.8 GHz에서 출력 전력 22.24 dBm 이 측정되었다. Wireless local area network(WLAN) 802.11n 변조 신호를 이용하여 2.4 GHz 및 5.0 GHz 대역을 측정하였으며, 출력 전력은 20.58 dBm 및 17.7 dBm으로 확인되었다.

• 한국잠사곤충학회지
• /
• 제40권2호
• /
• pp.105-110
• /
• 1998

The baculovirus egt gene encodes an ecdysteroid UDP-glucosyltransferase(EGT) which catalyzes the transfer of glucose from UDP-glucose to the insect moltion hormone ecdysteroid resulting in a functionally inactive ecdysteroid. In baculovirus-infected insect larvae, EGT has been shown block molting and pupation. In this study, we compared the development of 4th and 5th instar silkworm, Bombyx mori, larvae injected with either wild-type bombyx mori nucleopolyhedrovirus (BmNPV) or a mutant BmNPV(BmEGTZ) in which the egt gene was disrupted by the insertion of a lacZ gene cassette. Larvae injected with BmEGTZ died roughly 12 h more rapidly compared to indentical larvae infected with BmNPV. In addition, BmEGTZ- infected larvae prematurely stopped feeding and gain less weight compared to BmNPV-infected larvae. In order to investigate why BmEGTZ-infected larvae died more rapidly than BmNPV-infected larvae, the array of hemolymph proteins in BmEGTZ-or BmNPV-infected larvae were analyzed by SDS-PAGE. The hemolymph of BmEGTZ-infected larvae showed virus-specific proteins, including polyhedrin, about 12 h earlier than the hemolymph of BmNPV-infected larvae

• 동아시아식생활학회지
• /
• 제24권6호
• /
• pp.759-767
• /
• 2014

본 연구에서는 여주의 항당뇨 효과를 검색하기 위한 연구로 실험군은 정상 대조군과 당뇨 실험군으로 나누어, 당뇨 실험군은 당뇨 대조군과 여주열매 분말을 5%와 10%를 각각 식이에 첨가하여 4개군으로 실험하였다. 실험동물은 Sprague-Dawley계 수컷으로 STZ으로 당뇨를 유발한 흰쥐에게 4 주간의 해당식이를 공급하여 혈장의 유리지방산, HDL-콜레스테롤 및 중성지방, 간의 MDA와 단백질, 간의 시토졸에서 CAT, SOD, GST 및 XOD의 항산화효소 수준을 분석하여 다음과 같은 결과를 얻었다. 혈장 유리지방산 수준은 정상 대조군에 비해 당뇨 대조군에서 유의적으로 높은 수준이었으나, 당뇨 실험군 간에는 유의적인 차이는 아니었다. HDL-콜레스테롤 수준은 정상 대조군과 당뇨 대조군에서는 유의적인 차이를 보이지 않았으나, BM-5%군에서는 정상 대조군보다 유의적으로 높은 수준이었다. 중성지방 수준은 정상 대조군에 비해 당뇨 대조군에서 높게 유의적인 차이를 보였으나, 당뇨 실험군 간에는 유의적인 차이를 보이지 않았다. 간의 MDA 수준은 정상 대조군에 비해 당뇨 대조군 사이에는 유의적인 수준 차이를 보이지 않았으나, BM-10%군에서는 MDA 수준이 유의적으로 높은 수준이었다. 단백질 수준은 정상 대조군과 당뇨 대조군 사이에 유의적인 차이를 보였고, 당뇨 대조군에 비해 BM-5%군에서는 유의적인 차이는 아니었으나, BM-10%군에서 유의적으로 높은 수준이었다. CAT 수준은 정상 대조군과 당뇨 대조군에서 유의적이었으나, 당뇨 실험군 사이에는 유의적 차이를 보이지 않았다. SOD 수준은 정상 대조군과 당뇨 대조군 사이에 유의적인 차이를 보이지 않았고, 여주 첨가 시 당뇨 실험군 간에도 유의적인 차이를 보이지 않았다. GST 수준은 정상 대조군보다 당뇨 대조군 수준이 유의적으로 낮았고, 당뇨 대조군에 비해 BM-5%와 BM-10%군 모두에서 높은 수준으로 유의적인 차이를 보였다. XOD의 수준은 정상 대조군과 당뇨 대조군 사이에는 유의적인 차이를 보이지 않았고, BM-10%군에서는 수치상 낮아지는 수준이었으나, BM-5%군에서만 유의적으로 낮은 수준이었다. 이상의 연구결과, 여주열매 분말을 식이로 첨가하였을 때 당뇨 시 혈장 중성지방과 유리지방산 수준에는 차이를 보이지 않았고, 간 조직의 단백질과 MDA 수준은 높아지는 경향이었다. BM-5%군에서는 HDL-콜레스테롤과 GST 수준이 높아졌고, XOD 수준이 가장 낮아져 여주 첨가에 따른 양적인 차이를 보였다. 여주는 당뇨로 인한 산화적 스트레스를 줄이며, 당뇨 예방 및 치료를 위한 식사요법에 효과적인 식품으로 사료된다.