MCR에 의한 혐기성 소화에 대한 암모니아의 영향

김양지,김춘미,김성일,김종수 선문대학교 ·중소기업기술지원연구소 2002 선문공대 연구/기술 논문집 Vol.7 No.1

혐기성 소화에서 미생물에 저해/독성 물질로 알려진 암모니아의 농도와 식종원에 따른 영향을 MCR(Master Culture Reactor)을 이용하여 회분식으로 분석하였다. 식종원은 축간농가 축산폐수 집수조의 침전슬러지 그리고 하수종말처리장 혐기성 소화조 잉여슬러지를 사용하였다. 식종원에 상관없이 암모니아는 1,500㎎NH_4-N/L에서 COD 제거율과 가스생성율로 측정된 혐기성 미생물의 활성에 저해영향을 주기 시작하여 2,500㎎NH_4-N/L에서 더욱 심하였다. 암모니아 저해 농도 범위에서 휘발성 유기산의 농도는 50㎎/L 범위로 유지되므로 메탄생성균 뿐만아니라 산생성균도 저해영향을 받는 것으로 나타났다. 축산폐수 집수조 침전슬러지로 식종된 경우 암모니아 2,500㎎NH_4-N/L 농도 범위 이상으로 운전하여도 COD 제거율과 가스생성율은 일정하게 나타났지만 하수종말처리장 혐기성 소화조 잉여슬러지로 식종된 경우 암모니아 농도가 증가할수록 COD 제거율과 가스생성율은 감소하였다. 결과적으로 암모니아에 장기간 순응된 축산폐수 집수조의 침전슬러지로 식종한 경우 암모니아의 저해 농도에 대하여 적응도 빨랐으며 저해영향도 적음을 알 수 있었다. The influence of ammonia and the sources of seeding on anaerobic digestion were investigated by batch operation of MCR(master culture reactor). The sources of seeding on anaerobic digestion were from swine wastewater collection pit and anaerobic digestion sludge of a municipal sewage treatment plant. The inhibition effects of ammonia on anaerobic microorganisms were initiated at ammonia concentration of 1,500 ㎎NH_4-N/L and the effects were increased by increasing ammonia concentration upto 2,500 ㎎NH_4-N/L regardless the sources of seeding as evidenced by decreases in COD removal efficiencies and biogas yields. The inhibition occurred to not only methanogens but also acidogens since the concentration of volatile fatty acids was maintained at 50 ㎎/L during the batch operations of MCR. The COD removal efficiency and biogas yield were maintained constantly while increasing ammonia concentration upto 2,500 ㎎NH_4-N/L when swine wastewater collection pit was used as seeding; however, those were decreased while increasing ammonia concentration when anaerobic digestion sludge was used as seeding. The results indicate that the seeding acclimated to high concentrations of ammonia for long time was easy in adaptation to high ammonia concentration and less subjective to ammonia inhibitory effects.

비파괴 작업 종사자들의 염색체 이상과 소핵-FISH 분석

김양지,조윤희,김수영,최수용,정해원 한국방사성폐기물학회 2004 한국방사성폐기물학회 학술논문요약집 Vol.2 No.2

Hypoglycemic effect of standardized Chrysanthemum zawadskii ethanol extract in high-fat diet/streptozotocin-induced diabetic mice and rats

김양지,김현규,이학성 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.6

Chrysanthemum zawadskii (CZ) is a perennial herb belonging to the Asteraceae family. CZ is used medicinally to treat inflammatory and uterine diseases in Asia. CZ was extracted with 50% ethanol and CZ extract (CZE; at 125, 250, and 500 mg/kg body weight) was administered orally every day for 5 or 6 weeks to investigate the anti-diabetic effects in streptozotocin (STZ)-induced rats and STZ ? high-fat diet (HFD)-fed mice. CZE significantly decreased fasting blood glucose levels in STZ- and STZ ? HFD-induced diabetic models. In addition, glucose tolerance and insulin tolerance were improved in the STZ ? HFD ? CZE group by increasing insulin levels and decreasing hemoglobin A1c (HbA1c) levels in serum. Furthermore, CZE supplements decreased components of the serum lipid profile such as triglyceride, total cholesterol, and low-density lipoprotein cholesterol levels. These results suggest that CZE may be a potential candidate for controlling hyperglycemia.

레몬밤, 페퍼민트, 로즈마리, 솔잎의 증류 및 열수 추출물에 대한 향기성분 및 이화학적 특성 분석

김양지,육진수,김석중 한국산업식품공학회 2021 학술대회 및 심포지엄 Vol.2021 No.10

혐기성 소화에서 암모니아의 영향

김양지,안기섭,김종수 대한환경공학회 2002 대한환경공학회 학술발표논문집 Vol.2002 No.12

초임계 이산화탄소 추출로 얻은 도라지 종자유의 기능성 및 에멀젼 특성

김양지,임지영,김인호,김석중 한국응용과학기술학회 2019 한국응용과학기술학회지 Vol.36 No.1

In this study, functional and emulsifying properties of oil extracted by supercritical carbon dioxide from balloonflower(Platycodon grandiflorum A. DC) seeds were investigated. The oil was lower in total polyphenol(8 mg/100 g), but higher in α-tocopherol(14.15 mg/100 g), β -sitosterol(116 mg/100 g) and stigmasterol(8 mg/100 g) than seeds. Based on DPPH radical scavenging activ ity, the oil(IC 50 =1235.5 μg/mL) showed similar antioxidant activity to the seeds(IC 50 =1138.2 μg/mL). At 1%(w/w) lecithin, O/W emulsion with balloonflower seeds oil had turbidity, microscopic image, mean particle size and emulsion stability similar to emulsion with soybean oil, but had lower turbidity and emulsion stability and larger mean particle size than emulsion with perilla seeds oil. Its surface tension was similar to perilla oil emulsion. 본 연구에서는 초임계 이산화탄소를 사용해 도라지(balloonflower, Platycodon grandiflorum A. DC) 종자로부터 추출한 유지의 기능성과 에멀전 특성에 대해 조사하였다. 종자에 비해 도라지 종자 유는 총 polyphenol(8 mg/100 g)의 함량이 낮았으나 α-tocopherol(14.15 mg/ 100 g), β -sitosterol(116 mg/100 g) 및 stigmasterol(8 mg/100 g)의 함량은 높았다. DPPH 라디칼 소거능으로 분석한 종자유(IC 50 =1235.5 μg/mL)의 항산화능은 종자(IC 50 =1138.2 μg/mL)와 유사하였다. 1%(w/w) lecithin 농도에서 도라지 종자유를 사용해 제조한 에멀젼은 탁도, 지방구 입자 크기 및 형상, 유화안정 성에서 콩기름을 사용한 에멀젼과 유사하였으나 들기름 사용 에멀젼보다는 탁도 및 유화안정성이 낮았고 지방구 입자는 크게 나타났다. 도라지 종자유 에멀젼의 표면장력은 들기름 에멀젼과 유사하였다.

불법행위 손해배상책임에 대한 법경제학적 접근 - Hand Rule의 적용: 대법원 2019. 11. 28. 선고 2017다14895 판결 -

김양지 아주대학교 법학연구소 2021 중소기업과 법 Vol.12 No.2

Indications of an Adaptive Response to X-ray in Lymphocytes of Radiographers

김양지,송주영,최수영,정해원 한국유전학회 2007 Genes & Genomics Vol.29 No.4

Lymphocytes obtained from radiographers were iradiated with high-dose X-rays and analyzed for chromosome aberations and micronuclei to examine whether an adaptive response to ionizing radiation can be induced. The study subjects were seven male ome aberrations was lower in the lymphocytes of radiographers than in those of the controls when the lymphocytes were irradiated with 1 Gy of X-rays (7.93± 0.78 in radiographers, 8.31± 0.53 in controls), whereas the frequency was higher in the lymphocytes of radiographers before the irradiation (1.36±0.35 in radiographers, 0.13± 0.08 in controls). The same trend was observed for the frequency of micronuclei, but the diference was not statisticaly significant. The asociation with the frequencies of chromosome aberrations and micronuclei after 1 Gy of iradiation was significantly correlated in the radiographers and controls (Spearman’s correlation r=0.5, p=radiographers was correlated with the total cumulative dose (Spearman’s correlation, CA frequency, r=0.7, p<0.05; MN frequency, r=0.5, p=0.1). Thus, an adaptive response was observed in the radiographers, and therefore chronic occupational radiation exposure might act as an adapting dose.

친환경 실내 건축 마감 재료의 특성에 관한 연구

김양지,송지현,윤갑근 한국문화공간건축학회 2016 한국문화공간건축학회논문집 Vol.- No.53

IIndustrialization to meet human needs brought about improvement in many aspects of life including economic development and convenience in our daily life. Yet indiscriminate development of new materials and other things we needed caused environmental pollution, and began to damage both human society and natural environment. The recent trend related to this situation is expressed in the design aimed at environment-friendly models such as eco design and green design. Eco-friendly design refers to a design based on the idea of harmonious coexistence of humankind and nature pursuing benefits for both. We find the tendency toward eco-friendly design in the field of interior architecture too. Eco-friendly design elements in interior design find their key area in the finishing materials that are used for work within a space. Based on the understanding of the importance of the finishing materials in interior architecture, the present study makes a theoretical examination of the concepts of eco-friendly design and eco-friendly materials. Then it analyzes and evaluates the types and characteristics of eco-friendly materials that are in circulation in recent years so that it can identify the strengths and some areas to improve of the finishing materials for interior architecture. It is expected that this study will serve as a momentum to explore approaches to the new eco-friendly finishing materials for interior architecture in further research.

Bleomycin, Mitomycin C 및 Cadmium에 의한 CHO 세포의 적응반응

김양지,한정호,정해원 한국환경보건학회 1992 한국환경보건학회지 Vol.18 No.2

Pretreatment with low concentration of Bleomycin and Cadmium rendered Chinese Hamster Ovary Cells more resistant to the induction of chromosome aberration by subsequent high concentration of same agent, however Mitomycin C did not function in that way. The cells pre-exposed to low dose of Cadmitim did not show cross-resistance to challenge dose of Mitomycin C for the induction of chromosome aberration, but cells pre-exposed to Bleomycin showed cross resistance. And the cells pre-exposed to low dose of Mitomycin C showed cross resistance to challenge of Bleomycin, but Cadmium did not.