천연제올라이트 개질을 통한 건식 CO₂ 흡착제의 특성

최창용 ( Chang-yong Choi ),강헌찬 ( Heun-chan Kang ),성낙창 ( Nak-chang Sung ),최금찬 ( Kum-chan Choi ) 한국환경기술학회 2014 한국환경기술학회지 Vol.15 No.5

온실가스의 제어에 대한 국제적 조약과 관련 제어기술의 연구가 활발히 진행되고 있다. 이 중CO₂ 제어를 위한 습식흡착제를 이용한 기술이 많이 사용되고 있으며 재생 시 높은 에너지와 폐수처리의 문제를 가지고 있다. 건식 형태의 CO₂ 흡착제는 산업분야의 CO₂ 배출에서 미래에 흡착성능을 향상시킬 수 있는 방안이다. 본 연구에서는 천연 제올라이트를 이용하여 이온교환을 통한 새로운 건식흡착제를 개발하는 것으로 목적으로 하고 이온교환 및 열처리를 거쳐 CO₂ 흡착에 대해 각각의 성능을 비교 분석하였다. K⁺ 로 이온교환된 0.5M 농도의 흡착제가 가장 CO₂ 의 흡착력이 좋은 것으로 나타났다. 건식흡착제의 흡착성능은 공극의 크기, 공극의 부피, 형상 그리고 BET 와 더불어 미세공극의 구조에 영향을 받는 것으로 나타났다. There have been a lots of international agreements for reduction of greenhouse gases and studies to control industrial activities and life styles. One of the CO₂ control technologies is to use wet absorbents but it has some disadvantages such as absorbing power, wastewater treatment and high energy consumption problems for recycle. Dry type CO₂ adsorbents will promise CO₂ control technology to promote its adsorption efficiency by amending natural zeolite. We have developed environmental-friendly and economical CO₂ drying absorbents using natural zeolite by ion exchange and heat treatment. The absorbent with K⁺ ion exchange at 0.5M has showed most effective absorbing performance which depends on pore size, pore volume, and features and structure of micropore area along with BET.

소와 돼지의 연령별 구제역 백신 항체 양성률 분석

최창용 ( Changyong Choe ),정영훈 ( Young-hun Jung ),도윤정 ( Yoon-jung Do ),조아라 ( Ara Cho ),강석진 ( Seog-jin Kang ),김의형 ( Ui-hyung Kim ),김찬란 ( Chan-lan Kim ),신상민 ( Sang-min Shin ),류재규 ( Jae-gyu Yoo ),탁동섭 ( Dongs 한국동물위생학회(구 한국가축위생학회) 2018 韓國家畜衛生學會誌 Vol.41 No.1

The best way to prevent foot-and-mouth disease (FMD) constantly occurring in Korea will be vaccination. In this study, FMD vaccines were given to Korean native cattle (Hanwoo), dairy cattle, and pigs to investigate the antibody positive rate of FMD vaccine by age in year and month. Hanwoo, dairy cattle, and pigs showed antibody positive rates of 99.5%, 97.7%, and 95.9%, respectively. High antibody positive rates more than 95% were found in Hanwoo and dairy cattle. In particular, high antibody positive rates were found in Hanwoo and dairy cattle regardless of age. Pigs showed a relatively low antibody positive rate of 57.6% at 3 months of age and then constantly maintained a high antibody positive rate of above 95.0% after 4 months of age. As a result of this study, high antibody positive rates were found when regular FMD vaccination was given to newborn calves and piglets after FMD vaccination twice to them. Therefore, it is considered the most important to receive vaccination thoroughly according to vaccination plan in order to prevent FMD.

잣나무림에서 산림시업에 따른 소형 설치류 개체군 밀도 비교에 관한 기초 연구

박찬열 ( Chan Ryul Park ),최창용 ( Chang Yong Choi ),이은재 ( Eun Jae Lee ),양희문 ( Hee Moon Yang ) 한국환경생태학회 2006 한국환경생태학회 학술대회지 Vol.2006 No.1

Poly (ethylene glycol)-b-Poly(D,L-Lactide)를 이용한 나노입자의 제조 및 특성

장학수 ( Hak Su Jang ),최창용 ( Chang Yong Choi ),박준규 ( Jun Kyu Park ),이찬서 ( Chan Seo Lee ),류수현 ( Su Hyun Ryu ),강수미 ( Su Mi Kang ),장미경 ( Mi Kyeong Jang ),나재운 ( Jae Woon Nah ) 한국공업화학회 2006 응용화학 Vol.10 No.2

마라도에 번식하는 섬개개비의 번식지 특성

김은미 ( Eun Mi Kim ),김화정 ( Hwa Jeong Kim ),최창용 ( Chang Yong Choi ),강창완 ( Chang Wan Kang ),강희만 ( Hee Man Kang ),박찬열 ( Chan Ryul Park ) 한국환경생태학회 2009 한국환경생태학회지 Vol.23 No.6

국제적 멸종위기종이며, 동아시아에 국한하여 분포하는 섬개개비(Locustella pleskei)는 한국의 추자도, 마라도, 칠발도, 홍도 등에서 번식하는 것으로 알려져 왔으나, 구체적인 번식 정보는 아직 알려져 있지 않다. 본 연구는 마라도(N 33° 06`, E 126° 16`)에 번식하는 섬개개비의 번식 현황과 번식지 특성을 파악하기 위하여 실시되었다. 2008년 5월부터 9월까지 섬개개비 총 11쌍이 번식하는 것을 확인하였고, 번식하는 둥지는 곰솔숲의 관목층에 주로 분포하였다. 둥지는 곰솔숲의 관목층에 주로 분포하였으며, 동백나무(Camellia japonica)와 돈나무(Pittosporum tobira) 등 관목성 나무를 둥지목으로 선호하는 것으로 나타났다. 둥지목의 수고는 2.77±1.10m, 지면으로부터 둥지의 높이는 1.75±0.56m였으며, 둥지목의 수고는 다른 주변의 나무보다 낮은 것으로 나타나 마라도의 강한 해풍을 피하는데 유리한 것으로 판단되었다. 주로 억새잎이나 사초과 식물의 잎을 이용하여 밥그릇 형태의 둥지를 만들었으며, 둥지의 지름은 11.9±0.5cm, 높이는 11.1±1.1cm, 깊이는 5.8±0.4cm로 나타났으며, 산좌지름은 6.0cm였다. 마라도에서 섬개개비는 다른 섬지역보다 번식시기가 다소 늦었으며, 한배산란수는 3개로서 보통 다른 번식지의 4-5개보다 작았다. 이는 번식시기가 늦어질수록 한배산란수가 적어지는 일반적인 경향을 따르는 것으로 보인다. 이상의 결과로 볼 때, 마라도 곰솔숲의 솎아베기와 관목층 제거는 밀집된 관목층을 둥지로 선호하는 섬개개비의 번식에 영향을 미칠 수 있다. 따라서 섬개개비 번식 생태 및 서식지에 지속적이고 체계적인 조사가 요구되며, 숲가꾸기 수행에 있어서도 섬개개비의 보전을 위한 세심한 배려가 필요하다. Styan`s Grasshopper Warblers (Locustella pleskei) are vulnerable species distributed in East-Asia only. Its known breeding sites in Korea are remote islets including Hongdo Islet, Chilbal Islet, Mara Islet, and Chuja Islets, and, therefore, the breeding biology of this species is still poorly known. This study was conducted on Mara Islet (N 33° 06`, E 126° 16`) from May to September 2008 to investigate the breeding status and breeding site characteristics of the grasshopper warblers. A total of 11 breeding pairs and their nests were found on trees and shrubs at artificially planted forests and hedges of Pinus thunbergii. The grasshopper warblers preferentially utilized the shrub trees for nesting places, and major nesting trees were Camellia japonica, Pittosporum tobira and Pinus thunbergii as nesting trees. Average heights of nesting trees and nests were 2.77±1.10m and 1.75±0.56m, respectively. The grasshopper warblers selected lower shrubs and trees for nesting than randomly selected ones around them, probably to avoid strong and prevailed winds in flat and un vegetated environments on Mara Islet. The shape of nests was a round bowl-type, and measurements of nests were 11.9±0.5cm in exterior nest diameter, 11.1±1.1cm in height of exterior nest, 5.8±0.4cm in interior nest depth, and 6.0cm in interior nest diameter. It incubated eggs until the early August on Mara islet, and incubation periods of Mara Islet was possibly later than that of other areas. Furthermore, the clutch size in the study area was three, and they laid smaller number of eggs than normal clutch size (4~5 eggs) reported in other areas. Although we could not observe any nest predator on this species in the study area, selective cutting and pruning of trees will diminish dense shrub layer of forests. Therefore, it may affect the breeding of this threatened species which prefers dense shrubs of artificially planted forest of Pinus thunbergii. This study suggests that detailed and consistent further research on breeding biology and habitats of the grasshopper warblers are needed to conserve and manage of Pinus thunbergii forests on Mara Islet as an important breeding site of Styan`s Grasshopper Warblers.

한우에서 Ovum Pick-Up 유래 수정란의 임신 시기별 임신율 비교

고응규(Yeoung-Gyu Ko),이재영(Jae-Yeong Lee),김남태(Nam-Tea Kim),김찬란(Chan-Lan Kim),이세영(Se Young Lee),최창용(Changyong Choe) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.7

본 연구는 한우에서 난소 내 난자 채취(Ovum Pick-Up, OPU) 기술을 적용하여 수정란이식을 실시하였을 경우 임신기간 동안 임신율을 어떻게 유지하면서 분만에 이르는지 확인하고자 수행하였다. 수정란이식 후 시기별 임신율은 45일령 50%, 2개월령 47.5%, 6.5개월령 35.0%였다. 신선 수정란과 동결 수정란의 임신율은 45일령, 2개월령, 4개월령, 6.5개월령에 신선 수정란 64.3%, 64.3%, 57.1%, 50.0%였으며 동결 수정란은 임신 전체 기간동안 16.7%를 나타내었다. 상실배, 초기배반포, 배반포기 수정란을 이식하였을 때 임신기간이 경과할수록 임신율이 떨어졌으며, 수정란의 발달 단계가 성숙한 것을 이식할수록 임신율이 높아지는 것을 확인하였다. 공란우별로 7∼8개의 수정란을 이식하고 이들의 임신율을 조사한 결과 이식 후 6.5개월령에서 임신율이 12.5%∼71.4%를 나타내어 공란우별로 임신율에 큰 차이를 나타내었다. 수란우의 임신율은 6.5개월령에서 미경산우 16.7%, 경산우 57.9%로 나타났다. 본 연구 결과 한우에서 OPU 유래 수정란을 이식하였을 경우 신선·동결 수정란, 수정란 발달 단계, 공란우 개체, 수란우 분만 경력에 따라 수정란이식 후 임신율에 차이가 나는 것을 확인하였는데, 이는 수정란이식 후 임신율 및 분만율에 다양한 요인이 작용하는 것을 확인하는 계기가 되었으므로, 본 연구를 바탕으로 한우의 수정란이식 임신율을 향상 시킬 수 있는 다양한 연구를 지속적으로 추진하여야 할 것으로 사료된다. This study investigates how to maintain the pregnancy rate and reach parturition subsequent to embryo transfer achieved by applying the Ovum Pick-Up (OPU) technology in Korean native cattle (Hanwoo). The overall pregnancy rates after embryo transfer were determined to be 50% at 45 days, 47.5% at 2 months, and 35.0% at 6.5 months after embryo transfer. The pregnancy rates obtained after AI for fresh and frozen embryos were 64.3%, 64.3%, 57.1%, and 50.0% for fresh embryos at 45 days, 2 months, 4 months, and 6.5 months, respectively, and 16.7% for frozen embryos during the entire period. Transferring morula, early blastocyst, and blastocyst stage embryos resulted in decreased pregnancy rate during the pregnancy period, whereas transferring embryos at a mature developmental stage resulted in increased pregnancies. In all, 7 to 8 embryos of each donor cow were cultured to the blastocyst stage and transferred to recipient cows. This resulted in increasing their pregnancy rates from 12.5% to 71.4%. At 6.5 months of gestation, the pregnancy rates obtained were 16.7% in heifers and 57.9% in multiparous cows. Results of this study indicate the need for continuous promotion of further research that will help improve the pregnancy rate after embryo transfer of Hanwoo cows.

우리나라 유산양 알코올 양성유의 특징에 관한 연구

김혜라 ( Hye Ra Kim ),정지영 ( Ji Young Jung ),조인영 ( In Young Cho ),유도현 ( Do Hyeon Yu ),신성식 ( Sung Shik Shin ),손창호 ( Chang Ho Son ),오기석 ( Ki Seok Ok ),허태영 ( Tai Young Hur ),정영훈 ( Young Hun Jung ),최창용 ( Chan 한국동물위생학회 2013 韓國家畜衛生學會誌 Vol.36 No.4

The objective of the present study was to determine the minimum alcohol (ethanol) concentration that gives rise to the coagulation of goat milk for the alcohol precipitation test, and to evaluate the physical parameters of goat milk which include alcohol and heat stability. A total of 1,295 udder-half milk samples from 648 lactating dairy goats were collected from seven farms in Jeonnam province, Republic of Korea, to determine the alcohol and heat stability. The majority (99.6%) of the samples were coagulated when 70% ethanol was added to the milk, while only 11.0% of the samples were precipitated by the addition of an equal volume of 45% ethanol. With the concentration of 65%, 60%, 55% and 50% aqueous ethanol, 99.2%, 96.8%, 81.0% and 52.8% of the milk samples were coagulated, respectively. Of 1,295 dairy goat milk samples tested for heat stability, 127 (9.8%) were coagulated by boiling. Among the 143 alcohol test-positive udder-half milk samples, 52 (4.0%) were unstable by heat test, while 1,032 (79.7%) of the 1,152 alcohol test-negative milk samples were stable by heat test. According to the results of boiling test, sensitivity and specificity of 45% alcohol precipitation test were 0.3023 (95% CI: 0.2346∼0.3772) and 0.9190 (95% CI: 0.9017∼0.9344), respectively. The contents of protein and the specific gravity were higher in the milk samples of 45% alcohol test-positive than in those of 45% alcohol test-negative. However, lower levels of lactose and milk urea nitrogen were observed in the milk samples of 45% alcohol test-positive compared to the alcohol test-negative milk samples. The lowest pH values (6.73±0.20) were shown in the 45% alcohol test-negative and heat-unstable milk samples, while the lowest values of somatic cell counts and bacterial counts were shown in the 45% alcohol test-negative and heat-stable milk samples. Results of this study suggest that the alcohol precipitation for dairy goat milk may have to be tested with ethanol concentration less than 45% for the determination of freshness and heat-stability.

전남지방 산양유의 성분 및 체세포수의 계절적 변화

김혜라 ( Hye Ra Kim ),정지영 ( Ji Young Jung ),조인영 ( In Young Cho ),유도현 ( Do Hyeon Yu ),신성식 ( Sung Shik Shin ),손창호 ( Chang Ho Son ),오기석 ( Ki Seok Ok ),허태영 ( Tai Young Hur ),정영훈 ( Young Hun Jung ),최창용 ( Chan 한국동물위생학회 2013 韓國家畜衛生學會誌 Vol.36 No.4

Consistent information on the chemical composition and its seasonal variation of goat udder half milk is limited in Korea. The objective of this study was to analyze the seasonal variation of the chemical composition of goat milk to take establish various parameters into consideration on the pricing of the goat milk. Variations in chemical composition, somatic cell count (SCC) and bacterial count of 1,038 udder half milk samples from 650 heads raised in 7 farms of Jeonnam province were determined by season. Fat, protein, lactose, non-fat solids, milk urea nitrogen (MUN), pH, SCC and bacterial counts were also analyzed. The average composition of the milk was: fat 3.80±1.36%, protein 3.23±0.80%, lactose 4.39±0.54%, total solids 12.18±1.80%, non-fat solids 8.38±0.80%, and milk urea nitrogen 28.44±5.00 mg/dL. The average pH was 6.81±0.24. The average of SCC and bacterial counts were 2.54±4.60×106 cells/mL and 1.25±3.76×105 CFU/mL, respectively. Chemical composition, pH, SCC and bacterial counts of dairy goat milk varied widely during the lactation period and by season. The fat concentration was the lowest in spring (3.39±1.53%) and the highest in autumn and winter (3.98±1.30% and 3.98±1.48%). Protein concentration was the lowest during summer (2.92±0.48%) and the highest in winter (3.81±0.95%). Lactose concentration was the lowest in autumn (4.24±0.41%) and the highest in spring (4.58±0.35%). The lowest total solid value was obtained in the spring season (11.75±1.80%) which was then increased in winter (12.85±1.96%). Non-fat solid concentration was the lowest in summer (8.07±0.64%) and the highest in autumn (8.94±0.82%). MUN concentration was the highest in summer (8.07±0.64%), and the pH concentration was the highest in spring at 6.93±0.27%. Seasonal variation of SCC and bacterial count were the lowest in spring (0.94±1.54×106 cells/mL and 0.22±0.61×105 CFU/mL, respectively) and was the highest in winter (3.95±7.14×106 cells/mL and 2.23±5.54×104 CFU/mL, respectively).

Thioacetamide로 유발된 간 손상에 대한 Taraxacum officinale (Dandelion) 추출물의 효과

조인영 ( In Young Cho ),마세령 ( Se Ryung Ma ),문선진 ( Sun Jin Moon ),유도현 ( Do Hyeon Yu ),신성식 ( Sung Shik Shin ),손창호 ( Chang Ho Son ),오기석 ( Ki Seok Oh ),허태영 ( Tai Young Hur ),정영훈 ( Young Hun Jung ),최창용 ( Chan 한국동물위생학회 2013 韓國家畜衛生學會誌 Vol.36 No.4

The genus Taraxacum, known by the common name Dandelion, is a medicinal herb in the family Asteraceae. It has been traditionally used as a folk medicine for the treatment or prevention of various diseases due to its anti-inflammatory and anti-oxidative properties. In this study, we attempted to evaluate protective effects of Dandelion related with anti-oxidative activity to Thioacetamide (TAA)-induced liver damage. 36 rats were randomly assigned to six experimental groups:Control, Dandelion water extract (DWE), TAA, TAA&DWE 300, TAA&DWE 600, TAA&DWE 1,200 groups. Rats in DWE and TAA&DWE groups were pretreated with DWE (300, 600 or 1,200 mg/kg BW) by gavage for 7 days. All rats were treated intraperitoneally with TAA (200 mg/kg BW) or normal saline at 12 hours after last oral administration and sacrificed at 12 hours after last treatment. Levels of WBC and Neutrophil count were significantly decresed in TAA&DWE 1,200 group compared with that in TAA group (P <0.05). In TAA&DWE 600 and TAA&DWE 1,200 groups, serum AST, ALT, GGT levels were lower than TAA group (P<0.05). The serum TG level was significantly elevated in TAA&DWE groups compared with those in TAA group. Liver tissues from TAA group showed extensive histopathological changes, characterized by moderate or severe hepatocytes degeneration, inflammatory cell infiltration, and congestion. In the TAA&DWE group, The severity of histopathological lesions were decreased compared to those in the TAA group. The MDA concentration was significantly decreased and GSH content was significantly increased in the TAA&DWE 1,200 group compared to those in the TAA group. GR, CAT and GST activities in the TAA&DWE 1,200 group were significantly increased compared to those in the TAA group.