• Journal of the Korea Organic Resources Recycling Association
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• v.28 no.2
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• pp.41-48
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• 2020

In this study, organic carbon was extracted from the condensed water of food waste drying process to estimate the applicability as external organic carbon sources. The COD, TN, TP and TS of condensed water were 21,374 mg/L, 148 mg/L, 4.19 mg/L, and 455.7 mg/L, respectively. In addition, the content of biodegradable organics in condensed water was 47%. The fractional distillation and the vacuum evaporation were employed for extracting organic carbon. There were 8 extraction conditions, but 4 conditions were available for extraction. They were 1) 0mmHg, 110℃ 2) -600mmHg, 70℃ 3) -500mmHg, 80℃ 4) -600mmHg, 80℃. All 4 conditions showed the highest organic concentration and the highest quantity of organics when extracted 10% of initial volume. It was estimated that optimum conditions were 80℃, -600mmHg and 10% extraction. Then, extraction concentration, extraction quantity, extraction efficiency, extraction time, BOD/TCOD ratio, TVFAs/TCOD ratio and NH₃-N were 174,200 mg/L, 8,710 mg, 46%, 10 min, 0.97, 0.74 and 75.5 mg/L respectively. Therefore, the extracted organic carbon can be utilized as external organic carbon sources.

• Journal of Practical Agriculture & Fisheries Research
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• v.6 no.1
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• pp.116-135
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• 2004

This study was conducted to investigate effects of spent composts of Se-enriched mushrooms as the dietary Se source on muscular Se deposition and plasma glutathione peroxidase (GSH-Px) activity in the finishing Hanwoo steer. Twenty Hanwoo steers were used in the experiment and they were divided into four groups in a randomized complete block design with five replicates. Treatments were four levels (0.1, 0.3, 0.6 and 0.9ppm as fed basis) of dietary Se from the combination with spent composts of Se-enriched mushrooms and/or Se non-enriched mushrooms, in which each treatment was formulated with corn and corn gluten meal and so forth. Treatment diets were fed to Hanwoo steers for 90 days until the slaughter. Dry matter intakes had no significant differences among treatments and there were no significant differences for performances such as total BW gain and ADG among treatments. The Se concentration in blood was linearly increased with increasing dietary selenium levels and reached a plateau level after 8 weeks (p<0.001). Plasma GSH-Px activities had the similar trends to blood Se concentrations by showing that the increased dietary Se level significantly increased plasma GSH-Px activities of both total and Se-dependent (p<0.001). Muscle Se contents of Se-supplemented groups were linearly increased by 1.35 ~ 1.68 folds compared with the control group (0.1ppm; 0.273㎍/dry g) and especially those of the hind legs for 0.9ppm treatment showed the highest Se content as shown 0.457㎍ per dry gram (p<0.01) corresponding to approximately 70% increase of the control group. Se retention rate in the muscle of dietary Se originated from spent composts of Se-enriched mushrooms was estimated of maximum approximately 30% and dietary Se content showed the significant correlation with plasma GSH-Px activities and muscle Se contents (p<0.01). Accordingly, Se present in spent composts of Se-enriched mushroom as the dietary Se source not only had great bioavailabilities showing higher blood Se concentration and plasma GSH-Px activities, but also increased Se deposition in the muscle for Hanwoo beef cattle.

• Bulletin of the Korean Chemical Society
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• v.33 no.9
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• pp.3111-3114
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• 2012

• Proceedings of the Korean Fiber Society Conference
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• 2007.11a
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• pp.389-390
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• 2007

See Full Text

• Proceedings of the Korean Vacuum Society Conference
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• 2009.08a
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• pp.272-272
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• 2009

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.195-198
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• 1998

${\pi}-conjugated$ poly(arylene)s exhibit interesting electrochemical, optical, and electric properties, and various studies have been made on the chemical and physical properties of the poly(arylene)s. Poly(p-phenylene)(PPP) is a well-known highly conductive and highly stable organic material and is the subject of great interest in electronic device applications. (omitted)

• Proceedings of the Materials Research Society of Korea Conference
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• 2005.05a
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• pp.225-225
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• 2005

• Bulletin of the Korean Chemical Society
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• v.29 no.4
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• pp.885-886
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• 2008

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.632-635
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• 2007

We have synthesized 4'-nitrobiphenyl-4-carboxylic acid (NBCA) and fabricated the hole-only device consisting of ITO/NBCA SAM/TPD (1500 ${\AA}$)/Al (500 ${\AA}$) and the organic light emitting diodes (OLEDs) consisting of ITO/NBCA SAM/TPD (600 ${\AA}$)/Alq3 (600 ${\AA}$)/Al (600 ${\AA}$). The prepared hole-only device with NBCA exhibited lower driving voltage than the device with 4-nitrobenzoic acid (NBA). OLEDs using NBCA also show high external quantum efficiency.

• Polymer Science and Technology
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• v.17 no.3
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• pp.303-311
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• 2006