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검색결과 733건 처리시간 0.026초

액상법에 의한 가시광감응성 티타니아 나노튜브의 제조 (Preparation of Visible-light Active TiO2 Nanotubes by Solution Method)

  • 이현미;소원욱;백진욱;공기정;문상진
    • Korean Chemical Engineering Research
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    • 제50권1호
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    • pp.182-185
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    • 2012
  • $TiCl_4$와 히드라진/암모니아수를 사용하여 졸겔 및 강알칼리 수열합성법의 신규 2단 합성법을 통해 N도핑된 $TiO_2$ 나노튜브를 제조하였다. 제조된 나노튜브는 튜브형상의 손상이 없이 10 nm 전후의 직경과 3 nm 이하의 벽두께를 가지며, 잘발달된 아나타제 결정상을 나타내었다. 또한 N이 도핑되어 일반 도핑되지 않은 $TiO_2$ 나노튜브와 아나타제상입자에 비해 각각 ~35 nm, ~25 nm 정도 적색편이 된 우수한 가시광 흡수능과 노란색 색상을 보여 주었다.

Toxicity and Safety Profiles of Methanolic Extract of Pistacia integerrima J. L. Stewart ex Brandis (PI) for Wistar Rats

  • Sharwan, Gotmi;Jain, Parag;Pandey, Ravindra;Shukla, Shiv Shankar
    • 대한약침학회지
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    • 제19권3호
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    • pp.253-258
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    • 2016
  • Objectives: The goals of this research were to evaluate acute (single-dose) and sub-acute (repeated-dose) toxicity profiles of methanolic extract of Pistacia integerrima J. L. Stewart ex Brandis (PI) for Wistar rats and to assess the safety profile of PI by observing physiological changes, mortality, changes in body weight, the histopathology of body organs, the hematology and the biochemistry of the animals. Methods: The toxicity profile of PI was evaluated using Wistar rats of both sexes. Animals were divided into four groups: Group 1; control group (normal saline), Group 2; PI-1 (250 mg/kg), Group 3; PI-2 (500 mg/kg), Group 4; PL-3 (1,000 mg/kg). An acute-toxicity study in which animals received a single dose of PI extract (2,000 mg/kg) and were then observed for 14 days for changes in skin, fur, eye color, mucous membrane secretions and excretions, gait, posture, and tonic or clonic movements was performed according to guideline 425 of the Organization of Economic and Corporation Development (OECD). In the repeated-dose toxicity study (OECD - 407) animals received a daily dose of PI extract for 28 days (4 weeks). The parameters observed in this study include body weight, hematology and biochemistry of the animals. Results: In the acute toxicity study, no mortalities or changes in behavior were noted in the animals. The repeated-dose toxicity study was also devoid of any toxicity in the animals during the 28 days of testing with PI extract. The extract did not alter- the body weight, hematology or biochemistry of the animals. The methanolic extract of PI was to be found safe to the no-observed-adverse-effect-level (NOAEL) for the single-dose and repeated-dose toxicity tests in rats. Conclusion: The methanolic extract of PI was devoid of toxicity; hence, it can be used for various ayurvedic preparations and treatments of diseases.

종자번식 일대잡종 분화용 나팔나리(Lilium longiflorum) 'Charm' 육성 (Lilium longiflorum 'Charm' as a F1 Hybrid for Pot Plant)

  • 송천영
    • 화훼연구
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    • 제16권4호
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    • pp.304-308
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    • 2008
  • 분화용 나팔나리 'Nellie White', 'Ace' 및 'Hinomoto'와 교잡으로 자가 수정 5세대에서 선발한 계통인 L2-17'과 'L2-21'을 교잡하여 1대 교잡종 'Charm'을 육성하였다. 종자번식 나팔나리 일대잡종 품종 'Charm'은 화색이 흰색이고, 식물체 당 개화수가 7.4개로 많은 편이며, 꽃의 직경이 16.5 cm이고 개화기는 4월 10일경이다. 초장은 60.3 cm이고, 잎의 수는 70.3개이고, 잎의 길이는 18.8 cm이며, 잎의 폭은 2.4 cm이다. 또한 관상기간이 24.5일이고 기호도가 높다. 한편 'Charm'의 협당 채종 종자수는 251.1개이고, 발아율은 94.7%로 높다. 이와 같이 일대 잡종 'Charm'은 식물체 하부 잎이 건실하여 초세가 강건하고, 화경이 크고 화수가 많아서 개화기간이 길다. 또한 종자번식을 하므로 무병주 생산이 가능하다.

Incorporation of Selected Strains of Pediococcus spp. on Quality Characteristics of Dry Fermented Sausage during Fermentation and Ripening

  • Seleshe, Semeneh;Ameer, Ammara;Kang, Suk Nam
    • 한국축산식품학회지
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    • 제41권6호
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    • pp.1078-1094
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    • 2021
  • This research investigated the physio-chemical and microbial quality characteristics of dry fermented sausage from selected Pediococcus strains: P. acidiliactici (PE1) and P. pentosaceus (PE2) as compared to commercial starter culture (COS) during fermentation and ripening. Treatments showed no substantial variation (p<0.05) in water activity (aw) values across the study period. PE1 and PE2 treatments exhibited similar (p>0.05) pH values and presented remarkable (p<0.05) lower volatile basic nitrogen (VBN) and thiobarbituric acid reactive (TBARS) content than COS treatment throughout the ripening period. However, the pH values in COS batch were considerably lower than others. PE1 samples presented a significant highest (p<0.05) counts both in lactic acid bacteria (LAB) and total plate count (TPC) than COS and PE2 treatments at 7 days fermentation, and it resulted in a similar and higher TPC count as COS after the ripening period. After the ripening process, treatments are ordered based on LAB counts as follows: COS>PE1>PE2. All batches presented similar redness and yellowness attributes since the 7 days of fermentation and in lightness across the study period. Treatments were similar (p>0.05) in springiness and chewiness traits across the study period and in hardness characteristics in the ripened products. Cohesiveness was higher in PE1 and COS batches. No variation (p>0.05) in aroma and sourness sensory attributes of treatments. The color attribute was highest (p<0.05) in PE1 and PE2 treatments and PE1 had the highest overall acceptability. The overall outstanding merit exhibited by PE1 can be utilized in the commercial production of high-quality dry fermented sausage.

Fruit Yield and Quality Evaluation of Sweet Pepper (Capsicum annuum L.) F1 Hybrids Derived from Inbred Lines

  • Shrestha, Surendra Lal;Luitel, Binod Prasad;Lee, Taek Jong;Kang, Won Hee
    • 한국육종학회지
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    • 제42권4호
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    • pp.344-350
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    • 2010
  • Sweet pepper inbred lines (KNU1003, KNU1006, KNU1007, KNU1009, KNU1015, KNU1017 and KNU2006) developed at Kangwon National University (KNU) through conventional means, inbred lines (5AVS1, 5AVS2, 5AVS3, 5AVS5, 5AVS7 and 5AVS8) collected at Rural Development Administration (RDA) and inbred lines (SP12, SP27 and SP14) derived from anther culture were used as female parents and anther culture derived homozygous lines (SP9, SP10, SP14, SP24, SP25, SP27, SP30, SP32, SP34, SP38, SP43, SP45 and SP51) were used as male parents to produce $F_1$ hybrids. A total of 37 $F_1$ hybrids were evaluated for fruit yield and quality characters in summer season, 2007. Variation in fruit number, fruit weight, fruit yield per plant and fruit volume was observed among the $F_1$ hybrids. Superiority on yield over standard/commercial varieties were differed among $F_1$ hybrids. Hybrid $5AVS8{\times}SP45$ exhibited highest heterosis over Special (16.5%) and Fiesta (24.7%). Fruit quality characters (fruit length, fruit width, pericarp thickness, total soluble solid, fruit shape and fruit color) were varied among the $F_1$ hybrids. Fruit number, fruit weight and fruit volume per plant were correlated with fruit yield. Based on the standard heterosis expressed by the hybrids and quality characters evaluation, $KNU1017{\times}SP27$, $5AVS1{\times}SP43$, $5AVS5{\times}SP27$, $5AVS8{\times}SP45$, $SP12{\times}SP38$ and $SP27{\times}SP25$ hybrids were found to be superior over commercial cultivars and are selected. Inbred lines of these hybrid combinations can be used to produce $F_1$ hybrid seed for commercial production.

6종 식품의 혼합추출물이 사염화탄소로 유도된 흰쥐 간 손상에 미치는 보호효과 (Protective Effect of 6 Food Mixed-Extract on the CCl4-Induced Hepatic Damage in Rats)

  • 황보미향;예춘정
    • 한국식품영양학회지
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    • 제31권6호
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    • pp.828-835
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    • 2018
  • The objective of this study was to examine the biochemical parameters of hepatic function such as serum level of ALT (alanine aminotransferase), AST (aspartate aminotransferase), ALP (alkaline phosphatase), LDH (lactate dehydrogenase), and content of TG (triglyceride) and cholesterol, and tissue immunological changes of the $CCl_4$-treated rats with administration of the mixed sample extract (MSE). The liver weight in $CCl_4$-administered experimental control group (EC) was slightly higher than that of normal control (NC) group. Hepatic damage parameters (ALT, AST, ALP, LDH & TG) in serum of the EC group were significantly higher than those in serum of the NC and silymarin-treated positive control (PC) group. On the other hand, these hepatic damage parameters of MSE-treated experimental (E1 & E2) groups were significantly lower than those of EC group. The number of WBC, neutrophils, lymphocytes and platelets, and the contents of hemoglobin, and hematocrit in EC group were significantly higher than those of NC group. However, the number of WBC and lymphocytes in E1 and E2 groups were significantly lower than those of EC group. Also, the collagen developmental areas in the liver of NC and PC groups by hepatic immuno-histological findings were found slightly positive. Whereas, hepatic fibrous developmental tissue of EC group was strongly positive brown color band, those of E1 & E2 groups were decreased. Therefore, it was concluded that the induction of hepatic fibrous tissue activation had a preventive effect of MSE against the $CCl_4$-induced hepatic damage in rats. However, further study is needed in this filed.

Anti-Fogging, Photocatalytic and Self-Cleaning Properties of TiO2-Transparent Coating

  • ;김정식
    • 한국재료학회지
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    • 제31권1호
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    • pp.8-15
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    • 2021
  • Transparent, photocatalytic, and self-cleaning TiO2 thin film is developed by TiO2 sol-gel coating on glass and polycarbonate (PC) substrates. Acetyl acetone (AcAc) suppresses the precipitation of TiO2 by forming a yellowish (complex) transparent sol-gel. XPS analysis confirms the presence of Ti2p and O1s in the thin films on glass and PC substrates. The TiO2-sol is prepared by stabilizing titanium (IV) isopropoxide (TTIP) with diethylamine and methyl alcohol. The addition of AcAcsilane coupling solution to the TiO2-sol instantaneously turns to yellowish color owing to the complexing of titanium with AcAc. The AcAc solution substantially improves the photocatalytic property of the TiO2 coating layer in MB solutions. The coated TiO2 film exhibits super hydrophilicity without and with light irradiation. The TiO2 thin film stabilized by adding 8.7 wt% AcAc shows the highest photo-degradation for methylene blue (MB) solution under UV light irradiation. Also, the optimum photocatalytic activity is obtained for the 8.7 wt% AcAc-stabilized TiO2 coating layer calcined at 450 ℃. The thin-films on glass exhibit fast self-cleaning from oleic acid contamination within 45 min of UV-light irradiation. The appropriate curing time at 140 ℃ improves the anti-fogging and thermal stability of the TiO2 film coated on PC substrate. The watermark-free PC substrate is particularly beneficial to combat fogging problems of transparent substrates.

천연 인디고를 활용한 Digital Textile Printing용 잉크의 성능 분석 (Performance Analysis of Ink for Digital Textile Printing Using Natural Indigo)

  • 이원경;성은지;문종렬;안인용;윤광호;박윤철;김종훈
    • 한국염색가공학회지
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    • 제33권4호
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    • pp.202-209
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    • 2021
  • Natural dyes are more expensive than synthetic dyes and the dyeing process, which is mainly immersion of dye, is complicated. For this reason, relatively small-scale production methods were predominant. However, awareness and interest in environmental sustainability is rising globally, and the use of synthetic dyes causes various environmental problems such as wastewater and CO2 emission, so the consumption of natural dyes is increasing. In addition, interest in digital textile printing, an eco-friendly dyeing method that can produce products of various designs and uses less water, is growing. In this study, natural indigo dye (Indigofera tinctoria) was used as a raw material for Digital Textile Printing ink, and 14C (Biocarbon) present in it was measured to confirm whether it was derived from natural ingredients. The performance was confirmed by testing the pH, viscosity, electrical conductivity, surface tension, and particle size analysis of natural indigo ink. In addition, the performance of natural indigo DTP ink and printing fabric was evaluated by inspecting the change in color fastness and corresponding index substances before and after digital printing with natural indigo DTP ink on textiles. Through this, the possibility of commercialization of DTP ink and printing fabric using natural indigo was confirmed.

Effect of ultrasound assisted rehydration on the quality of dried sea cucumber

  • Bambang Riyanto;Wahyu Ramadhan;Rezhelena Moesriffah
    • Fisheries and Aquatic Sciences
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    • 제26권9호
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    • pp.535-547
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    • 2023
  • Sea cucumbers (Holothuria scabra), also known as beche-de-mer, are highly valued as a luxurious food item and have been utilized as a traditional tonic food in various Asian countries for centuries. The body walls of sea cucumbers are the main edible part, which are primarily composed of glycosaminoglycan (GAG). The rehydration of dried sea cucumber is a crucial step prior to further processing. The aim of this study was to assess the impact of ultrasound-assisted rehydration (UAR) on the quality of dried sea cucumbers. The experiment used four different rehydration methods, including conventional methods at 27℃ (KV27℃) and 15℃ (KV15℃), as well as a combination of ultrasound at 27℃ with conventional at 15℃ (UAR27 + KV15℃) and ultrasound at 15℃ with conventional at 15℃ (UAR15 + KV15℃). Results indicated that the rehydration rate (RR) was significantly affected by both the rehydration method and the temperature used (p < 0.05). UAR27 + KV15℃ was identified as the most effective method in terms of rehydration behavior and quality characteristics of dried sea cucumber, with a RR of 0.58 ± 0.53 gH2O/hour and reduced rehydration time of up to 28 hours. Moreover, the UAR27 + KV15℃ method demonstrated superior rehydration potential, nutritional value (proximate composition and sulfate content), color, lower energy, and microstructure properties compared to the other methods. The sulfate content and yield of sulfated GAGs were determined to be 89.4 mg/g and 52.8 ㎍/g, respectively. Confirmation of the absorption band of the sulfate group showed the presence of 3-N-acetyl galactosamine at a wavelength of 1,269 cm-1 and C-O-S at 860 cm-1. The sea cucumbers treated with UAR exhibited a GAG content approximately 2.9 times higher than those rehydrated with the conventional method. Eventually, the combination of UAR at 27℃ with conventional at 15℃ methods can significantly accelerate the rehydration of sea cucumber without negatively affecting its physical quality properties.

2차 발효 후 로제 스파클링 와인의 품질 특성 및 기능성 (Quality Characteristics and Functionality of Rose Sparkling Wines by Secondary Fermentation)

  • 신혜림;이윤정;황온빛;박의광;최성열;윤동규;윤향식
    • 한국식품영양학회지
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    • 제36권6호
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    • pp.425-435
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    • 2023
  • This study investigated quality characteristics and functionality of rose sparkling wine that were manufactured by secondary fermentation after inoculation of yeast strains. The pH of the samples ranged from 3.96 to 4.05 and total acidity ranged from 0.23 to 0.32%. The alcohol contents of wines ranged from 6.4 to 6.6% and the CO2 pressure ranged from 2.0 to 2.6 bar. The brightness of rose wines ranged from 84.72 to 87.36, the redness from 9.28 to 14.15, and the yellowness from 9.50 to 19.20. The hue value of wines ranged from 1.137 to 1.513 and color intensity ranged from 0.724 to 0.882. Aroma analysis identified 14 alcohols, 22 esters, 4 ketones, 4 acids, and 17 miscellaneous compounds. The total tannin contents and total polyphenol contents of wines were 11.28~12.43 mg% and 24.79~28.20 mg%, respectively. The DPPH radical scavenging activity of wines ranged 63.33 to 67.89% and the ABTS radical scavenging activity of wines 82.16~86.06%. The results of this study provide a basis for establishing the brewing process of rose sparkling wines yeast strains.