• BMB Reports
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• 제43권1호
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• pp.52-56
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• 2010

Silk fibroin, produced by the silkworm Bombyx mori, has been widely studied as a scaffold in tissue engineering. Although it has been shown to be slowly biodegradable, cellular responses to degraded silk fibroin fragments are largely unknown. In this study, silk fibroin was added to MG-63 cell cultures, and changes in gene expression in the MG-63 cells were screened by DNA microarray analysis. Genes showing a significant (2-fold) change were selected and their expression changes confirmed by quantitative RT-PCR and western blotting. DNA microarray results showed that alkaline phosphatase (ALP), collagen type-I alpha-1, fibronectin, and transforming growth factor-${\beta}1$ expressions significantly increased. The effect of degraded silk fibroin on osteoblastogenic gene expression was confirmed by observing up-regulation of ALP activity in MG-63 cells. The finding that small fragments of silk fibroin are able to increase the expression of osteoblastogenic genes suggests that controlled degradation of silk fibroin might accelerate new bone formation.

• 한국전기전자재료학회논문지
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• 제34권6호
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• pp.487-494
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• 2021

Piezoelectric generators use direct piezoelectric effects that convert mechanical energy into electrical energy. Many studies were attempted to fabricate piezoelectric generators using piezoelectrics such as ZnO, PZT, PVDF. However, these various inorganic/organic piezoelectric materials are not suitable for bio-implantable devices due to problems such as brittleness, toxicity, bio-incompatibility, bio-degradation. Thus, in this paper, piezoelectric generators were prepared using a silk fibroin film which is bio-compatible by dip-coating method. The silk fibroin films are a mixed state of silk I and silk II having stable β-sheet type structures and shows the d₃₃ value of 8~10 pC/N. There was a difference in output voltages according to the thickness. The silk fibroin generators, coated 10 times and 20 times, revealed the power density of 16.07 μW/cm² and 35.31 μW/cm² using pushing tester, respectively. The silk fibroin generators are sensitive to various pressure levels, which may arise from body motions such as finger tapping, foot pressing, wrist shaking, etc. The silk fibroin piezoelectric generators with bio-compatibility shows the applicability as a low-power implantable piezoelectric generator, healthcare monitoring service, and biotherapy devices.

• 한국잠사곤충학회지
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• 제38권2호
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• pp.160-167
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• 1996

견단백질을 구성하는 액상견사막인 중부견사막을 추출한 후, 약3배로 급속히 연신하여 견 monofilament를 제작하였다. 이 시료를 연화시켜 분자간의 수소결합능을 저하시키기 위해 비등상태의 증류수에 팽윤시킨 다음 연신처리를 행한 결과는 다음과 같다. 1. 열분석과 X선회석의 결과로부터 견사막건조물시료은 Silk I형의 결정영역 및 random 무정형분자로 구성되어 있었으나 monofilament시료에서는 부분적으로 Silk II형결정이 발현하기 시작하여 더욱더 연신한 62.5% 연신시료에서는 거의 완전한 Silk II형결정으로 전이하는 것을 알 수 있다. 2. 복굴절율 및 밀도는 monofilament시료에 비해 연신율의 상승과 함께 증가하는 경향을 나타내어 견 fibroin분자의 배향은 초기에 급격히 증가하여 fibroin분자의 배향이 완성되었다. 3. 가수분해처리에 의한 복굴절율은 연신율의 상승에 따라서 증가하는 경향이었다. 또, 가수분해의 처리시간과의 관계에서는 연신율이 증가함에 따라 복굴절율도 거의 일정하게 나타나 배향결정화가 진행되어 배열이 좋게 되어진 무정형이 결정으로 전이하는 것이 시사되었다. 4. 62.5% 연신시료를 가수분해한 경우의 X선회절은 가수분해에 의해 배향의 흐트러짐은 생기나 결정풍괴는 일어나지 않았다. 열분석에서도 가수분해의 처리시간이 증가함에 따라 최대흡열 peak 온도는 저온측으로 이동하여 가수분해처리에 의해 고배향의 무정형부분이 유출로 인하여 결정부분의 배향이 흐트러진다는 것이 X선분석 결과로부터 추측되어진다.

• 대한가정학회지
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• 제20권1호
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• pp.1-10
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• 1982

This experiment was made on the basis of the general observation that silk fabrics is flaccid in sun light. The purpose of this test is to examine efficiency between the processed thread and the unprocessed one after putting the later under the xenon-lit system, which produces continuous spectrum of bright white beam similar to sun light. (i) Color division of silk thread : white, yellow blue (ii) light division and irradiation time : sun lightlongrightarrow210 hrs, Xenonlongrightarrow50,100, 150 hrs. Under the above conditions each object was be tested with and extensometer, TENSILON Type III for the results of (a) the weight-expansibility curve of the silk thread (b) the relationship between cutting in tensity and maximum, weight (c) maximum expansion rate (d) the expansion energy of the tested silk thread (e) the beginning pull-stretch resistance rate of the tested silk thread (f) color difference after processing The results are illustrated in the appropriate tables and figures. Consequently the generalobservation that silk fabrics is flaccid is relevant only in terms of color. So for as Cutting-intensaty is concerned, it turned out to be less flaccid than in color. On the contrary when the untested silk thread was conpared with the xenon-irradiated ones, the latter proved itself to be more flaccid in cutting expansibility than the former. We have learned through this experiment that, after the all rounds of this test, the color tone and chroma of the colored materials remained without significant change, where as their color value changed to a large extent.

• 한국잠사곤충학회지
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• 제34권2호
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• pp.52-57
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• 1992

견의 저온염색용 조제(K-1)를 사용하여 염료 농도, 염욕의 pH, 염색시간에 따른 염색속도를 구하여 이 저온염색용가 염색에 미치는 영향을 분석한 결과를 다음과 같이 요약한다. 1. pH 7에서 K-1의 농도가 증가할수록 무첨가구에 비해 흡진율은 증가 하였으며, K-1의 농도가 3% o.w.f. 이상에서는 증가의 경향이 둔화되었다. 2. pH 5에서도 무첨가보다 K-1의 첨가구에서 높은 흡진율을 보였으며, pH 7의 5$0^{\circ}C$ 첨가구가 pH 5, 5$0^{\circ}C$의 무첨가구보다 확산성은 높게 나타났다. 3. 염료 농도별로 볼 때 pH 7과 pH 5에서 모두 K-l 첨가구에서는 무첨가구보다 흡진율이 클 뿐만 아니라 염료 농도에 따른 흡진율 감소가 적게 일어났다.

• 한국잠사곤충학회지
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• 제32권2호
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• pp.110-112
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• 1990

The influence of the concetration of the discharging agent on some properties of silk fabric dyed with reactive dyes studied. The tensile strength, yellow index and whiteness were investigated as parameters to determine the effect of the dischanging agent. The results were summarized as follows ; 1. The tensile strength and the yellow index decreased with the increase of the concentration of the discharging agents. 2. The whiteness depended on both of the type and the concentration of the discharging agent.

• 한국잠사곤충학회지
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• 제25권2호
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• pp.58-64
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• 1984

반응성염료중 chlorotriazinyl계 염료로 견직물에 날염가공 하여, 증열시간, 호료의 점도, 알칼리농도에 의한 염착량 및 고착량을 측정하여 견에 대한 반응성염료의 날염특성에 관하여 연구한 결과를 다음과 같이 요약한다. 1) 증열시간과 더불어 염착량 및 고착량은 증가하였으며, dichlorotriazinyl계 염료는 20분부근에서 최대치를 나타내었다. 2) 고착률은 90%이상으로 높은 고착률을 나타내었다. 3) 호료의 점도에 따라 염착량 및 고착량은 달라지며, 적당한 점도가 필요함을 시사한다. 4) 알칼리 농도는 호료 100g에 대하여 NaHCO$_3$2g을 첨가하였을 때 염착량 및 고착량이 가장 높았다. 5) 염색견뢰도중, 실용상 가장 중요한 세탁견뢰도가 매우 높았다.

• 한국염색가공학회지
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• 제6권1호
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• pp.1-7
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• 1994

A low-temperature dyeing system for silk fabrics based on a redox system has been investigated. Some factors affecting dyeing of silk fabrics with levelling acid dyes in the absence and presence of certain redox system were investigated under different conditions. The variables studied were; type and concentration of redox system, dyeing conditions, i. e. temperature and time, dye concentration, material-to-liquor ration(LR) and colour fastness. The colour strength(K/S value) is outstandingly higher in the presence than in the absence of redox system. A comparison between the colour strength values of such dyeings abtained the three redox system would call for the following order ; Glyoxal/hydrogen peroxide>thiourea/hydrogen peroxide>glucose/hydrgen peroxide> nothing. In the presence of redox system, free radicals are supposed to be formed in both the fiber and the dye and the interaction between these free radicals bring about covalent fixation beside the usual electrostatic bonds, hydrogen bonds and Van der Waals forces.

• 한국잠사곤충학회지
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• 제32권1호
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• pp.58-67
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• 1990

견 피브로인 막을 통한 투과실험으로, 종전의 견섬유로는 얻을 수 없었던 투과 및 확산거동에 대하여, Dual mechanism을 적용하여 고찰하였으며, 아울러 염료의 구조가 이러한 물리화학적 성질에 가지는 영향에 관해서 고찰한 결과를 요약하면 다음과 같다. 1) 전체적인 확산계수 $D_{(c)}$는 주로 Langmuir-type 확산계수 $D_{L}$에 의해서 결정된다. 2) 농도에 따른 확산계수의 조사에서 Dye I (monobasic dye)에서는 뚜렷한 최대치가 관찰되었으나, Dye III(trisulfonic acid dye)에서 $D_{p}$는 거의 의미가 없는 것으로 나타났다. 3) 견 피브로인에 있어서 산성염료의 확산은 sulfonic acid group의 도입에 따라 정점 느리게 되고, $D_{L}$은 온도의 증가에 따라 더 큰 값을 나타냈다. 4) 염료 음이온의 하전수가 클수록 확산계수는 chemical potential gradient model에 더욱 더 가깝게 된다. 5) 투과의 활성화 에너지는 sulfonic acid group의 도입에 따라 감소되었다.다.

• 한국의상디자인학회지
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• 제12권2호
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• pp.67-73
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• 2010

Whole process of textile printing is made by computer and it remarkably improves environment problem. This digital textile printing is becoming next step environment friendly textile printing method. But, still now range of textile possible for digital textile printing is limited, and also color analysis according to fiber types is not completed. The ink printed on the fabrics through DTP printer can be absorbed and fixed into textile without any blots by pre-treatment using suitable media solution for fabrics types. The chemical formulation of media solution used in the pre-treatment process varies according to the types of textiles and inks for DTP products. First, I studied reference books or articles about color analysis of digital textile printing. Second, I recorded pre-process, printing, post-process and coloring of silk, wool, nylon at same condition. After that, I analyzed $L^*\;a^*\;b^*$, Total K/S, ${\Delta}E$ and studied color intensity and coloring. According to this study, I suggested particular textile special for coloring and manual for affective coloring control. It showed that the performance of the digital printing on the Silk, Wool and Nylon blend fabrics treated by the media solution developed in this study was better than the one treated by the previous media solution for each single inks.