• 한국양식학회지
• /
• 제20권2호
• /
• pp.85-89
• /
• 2007

무지개송어 품종개량의 일환으로 국내에 이식 양식되고 있는 미국산 무지개송어 발안난의 부화와 자치어 성장에서 얻어진 초기사육에 관한 기초적 시험을 실시하고 그 결과는 다음과 같다. 무지개송어 발안란의 난경은 $4.95{\pm}0.34\;mm$, 중량은 $0.07{\pm}0.003\;g$였다. 발안란은 8일째인 11월 25일에 전량 부화되었으며, 부화율은 평균 87.8%였다. 무지개송어 치어를 56일간 사육한 결과 전장 $4.0{\pm}0.7\;cm$로 매우 완만한 성장을 보였으며, 전장의 사육 경과일수에 따른 성장식은 TL=0.0366ED+1.8645 ($r^2=0.9285$, n=350)로 표시되었다. 부화된 치어의 평균 체중은 0.09 g였으며, 사육 $14{\sim}20$일째 $0.11{\sim}0.14\;g$로 서서히 증가되어 사육 41일째 0.33 g, 사육 48일째 0.45 g, 56일째 0.62 g로 급증되었으며, 체중의 사육 경과 일수에 따른 성장식은 $BW=0.0638e^{0.0408ED}\;(r^2=0.9917,\;n=350)$로 표시되었다. 치어의 56일간 사육 시 생존율은 $64.5{\pm}1.3%$였다.

• 현장농수산연구지
• /
• 제13권1호
• /
• pp.131-136
• /
• 2011

난류해역에 서식하는 대형종인 시볼트전복, Haliotis sieboldii에 대한 인공종묘 생산기술 확립을 위하여 수정률, 발생과 생물학적 영도에 관한 연구를 수행하였다. 발생단계별 소요시간은 수온에 대한 지수함수적 관계식으로 나타낼수 있었으며, 수온(T: ℃)과 발생단계별 소요시간(t: hour)의 관계식은 4 세포기 1/h = 0.1346T - 2.1709 (r² = 0.88) 상실기 1/h 0.0176T - 0.2184 (r² = 0.89) 담륜자기 1/h = 0.0063T - 0.0512 (r² = 0.98) 피면자기 1/h = 0.0045T - 0.0295 (r² = 0.99) 제 2 두부촉각형성 1/h 0.0008T - 0.0047 (r² = 0.99)으로 표시되었다. 초기발생에 있어서 난발생이 정지하는 생물학적 영도(biogical minimum temperature)는 평균 9.7℃로 추정되었다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제22권12호
• /
• pp.1633-1639
• /
• 2009

This study investigated the effect of maternal undernutrition during late pregnancy on the growth and development of ovine fetal visceral organs. One hundred Mongolian ewes were mated at a synchronized oestrus and divided into three groups and offered 0.175 MJ ME $kgw^{-0.75}\;d^{-1}$ (Restricted Group1; RG1), 0.33 MJ ME $kgw^{-0.75}\;d^{-1}$ (Restricted Group2; RG2) and ad libitum access to feed (Control Group; CG) during late pregnancy (90 days). Selected animals in each group were slaughtered immediately at d 90 of pregnancy and after parturition (neonatal lambs), and major visceral organs were removed and weighed separately. The results indicated that the weights of lung (p<0.01), spleen (p<0.01), heart (p<0.05), liver (p<0.05) and abomasum (p<0.01) in RG1 were significantly lighter than those of CG. For RG2, only the weights of the lung (p<0.05) and spleen (p<0.01) were significantly lighter than those of CG; when expressed as a percentage of body weight, significance was retained in the spleen (p<0.01) for both restricted groups, but the percentage of brain in RG1 was significantly higher than that in CG (p<0.01). For lung and spleen, the amount of DNA was significantly lower (p<0.01) in both groups of restricted neonatal lambs compared to CG; however, there was a significant difference only between RG1 and CG for protein: DNA ratio (p<0.01). The DNA content of kidney, abomasum and jejunum were decreased (p<0.05) in RG1 neonatal lambs, but protein: DNA ratio in the liver was decreased compared with that of CG (p<0.05). The plane of maternal undernutrition during late pregnancy had a significant effect on the growth and development of fetal visceral organs, which altered ontogeny of fetal organ growth and development. These perturbations in fetal visceral development may have significant implications on postnatal growth and adult health.

• KSBB Journal
• /
• 제30권2호
• /
• pp.58-62
• /
• 2015

본 연구에서는 산란계의 in vivo실험을 통하여 난황 레시틴추출 부산물이 산란계의 뼈의 Ca 침착과 성장에 도움을 줄 수 있다는 결과를 얻었다. 산란계 전기 사료에 Ca의 수준을 0%, 0.2%, 0.4%, 0.6%로 조절하여 실험한 결과 증체량에서 0%, 0.2% Ca을 첨가한 그룹의 증체량은 유의적으로 감소하였으나 0.4%, 0.6% 첨가 그룹에서는 정상적인 성장율을 확인하였다. 반면에 0.4% Ca을 첨가한 그룹에 레시틴 추출 부산물을 0.2%, 0.4% 첨가한 그룹에서 각각 1.5%, 7.1%로 증가하여 농도의존적으로 증가하는 경향을 보였으나 유의한 차이는 없었다. 실제 산란계의 경골을 적출하여 중량, 회분, Ca의 함량을 조사한 결과 경골 중량에서는 0.4% Ca 첨가그룹에 비해 레시틴 추출 부산물을 추가로 첨가한 그룹에서 각각 8.4%, 13.4%로 증가하는 경향을 확인하였다. 회분량에서도 0.4% 첨가 그룹에 비해 레시틴 추출 부산물 첨가그룹에서 증가하였지만, 유의한 차이는 없었다. 경골내의 Ca 함량을 조사한 결과는 0.4% Ca 첨가그룹에 비해 레시틴 추출 부산물이 4.3%, 5.9%가 각각 유의한 경향으로 증가하였다. 경골에 실제로 Ca이 흡수되었는가를 확인하기 위하여 lateral femoral joint 부분을 von Kossa's stain을 실행한 결과 Ca 결핍 그룹에서 Ca 축적이 현저히 감소한 것을 확인한 반면, 그 외 그룹에서는 Ca이 충분히 침착되어 있었으며 산란계 사료내의 적정 Ca 함량이 0.4%라는 것을 다시 한번 확인하였다. 본 연구에서는 계란 난황의 레시틴 추출 부산물의 단백질 분획 소재를 이용하여 뼈 성장 촉진 인자 및 Ca 흡수촉진 보조제로서의 가능성을 보여줬으며, 그 기대를 높이기 위해 혈액분석, 측정항목의 세분화 등 반복적인 연구가 수반되어야 하겠다.

• 농업과학연구
• /
• 제41권4호
• /
• pp.425-431
• /
• 2014

본 연구는 우리나라 재래돼지의 고유 특성을 살린 우수한 품종을 개발하기 위하여 수행하였으며, 도체특성은 DK1이, 육질특성과 지방산조성은 DK2가 두록과 비교하여 차이가 없거나 우수한 것으로 나타나 재래돼지를 활용한 우수한 육질의 돼지 품종 개발이 가능할 것으로 사료된다.

• 수산해양교육연구
• /
• 제27권1호
• /
• pp.41-48
• /
• 2015

Juvenile banded catfish(Pseudobagurus fulvidraco, mean length $10.4{\pm}0.37cm$ and mean weight $14.5{\pm}0.46g$) were exposed to several nitrite(${NO_2}^-$) concentrations for 96h at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$. The result showed that cumulative mortalities of fish to ${NO_2}^-$ levels of 12.4, 19.8, 33.9 and 53.6 mg/L at pH levels of $6.18{\pm}0.54$ were 20, 25, 40 and 85%, respectively. At pH $6.5{\pm}0.54$, mortalities to ${NO_2}^-$ 22.4, 36.4, 45.3 and 63.2 mg/L were 25, 35, 50 and 100%, respectively. At pH $7.07{\pm}0.22$, mortalities to ${NO_2}^-$ 25.5, 45.7, 56.3 and 66.4 mg/L were 0, 55, 70 and 100%, respectively. The 96h-$LC_{50}$(median lethal concentration, $LC_{50}$) of fish to several ${NO_2}^-$ concentrations at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$ were assessed in these experiments. 96h-$LC_{50}$ at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$ were 32.68, 40.49 and 45.85 mg/L, respectively. It indicated that acute toxicity of ${NO_2}^-$ to juvenile banded catfish increased with low levels of pH and lengthening of exposure time to ${NO_2}^-$. In particular, smaller fish(mean weight $14.5{\pm}0.46g$) were more sensitive to ${NO_2}^-$ than larger fish(mean weight $81.7{\pm}1.42g$; not published). The 96h-$LC_{50}$ of juvenile banded catfish to ${NO_2}^-$ would be primary guideline for water quality management in the intensive culture system such as RAS and BFT.

• 대한화장품학회지
• /
• 제25권4호
• /
• pp.1-5
• /
• 1999

The purpose of this study was to determine the effect of IPBC(3-lodo-2-propynylbutylcarbamate) on dandruff caused by the anthropophilic fungus Malassezia furfur. The effects of IPBC on dandruff were examined by evaluating (a) the MIC value of IPBC using broth dilution method; (b) the remnant antimicrobial activity of IPBC containing shampoo on skin disc; (c) the antidandruff efficacy of 1.0 % IPBC containing shampoo in double blind clinical trial. To investigate the remnant antimicrobial activity of IPBC against Malassezia furfur, guinea pig-skin disc was washed with antidandruff shampoo and then the diameter of inhibition zone per disc was measured. For clinical trial, thirty healthy volunteers, aged 25-35, participated in 4 week study. At 0, 2, 4 weeks, examinations of scaling, itching on scalp were carried out. The MIC(Minimun Inhibition Concentration) values of IPBC range from 0.10 to 1.00${\mu}g/ml$ and it seems that IPBC is more effective in the MIC values than zinc pyrithione, selenium disulphide, piroctone olamine and comparable to ketoconazole, climbazole. When the remnant antimicrobial activity of IPBC shampoo on skin disc was determined, 0.5% IPBC shampoo and 2.0% Ketoconazole shampoo resulted in similar antimicrobial effect. In addition, 1.0%, 2.0% IPBC shampoo was more effective than 2.0% ketoconazole shampoo. After two and four-weeks of 1.0% IPBC shampoo treatment, there was significant reduction of scaling, itching in test group compared to control group. On the basis of these results, it can be concluded that 1.0% IPBC is more effective than 2.0% Ketoconazole in reducing dandruff. It seems that strong capacity of drug binding to the stratum corneum plays a role in its antidandruff effect since adsorption of active ingredients on scalp is very important factor in reducing dandruff.

• 대한화장품학회:학술대회논문집
• /
• 대한화장품학회 1999년도 IFSCC . ASCS 학술대회 발표 논문
• /
• pp.1-5
• /
• 1999

The purpose of this study was to determine the effect of IPBC(3-lodo-2-propynylbutyl carbamate) on dandruff caused by the anthropophilic fungus Maiassezia furfur. The effects of IPBC on dandruff were examined by evaluating (a) the MIC value of IPBC using broth dilution method : (b) the remnant antimicrobial activity of IPBC containing shampoo on skin disc ; (c) the antidandruff efficacy of 1.0 % IPBC containing shampoo in double blind clinical trial. To investigate the remnant antimicrobial activity of IPBC against Maiassezia furfur, guinea pig-skin disc was washed with antidandruff shampoo and then the diameter of inhibition zone per disc was measured. For clinical trial, thirty healthy volunteers, aged 25-35, participated in 4 week study. At 0,2,4 weeks, examinations of scaling, itching on scalp were carried out. The MIC(Minimun Inhibition Concentration) values of IPBC range from 0.10 to 1.00$\mu$ g/ml and it seems that IPBC is more effective in the MIC values than zinc pyrithione, selenium disulphide, piroctone olamine and comparable to ketoconazole, climbazole. When the rimnant antimicrobial activity of IPBC shampoo on skin disc was determined, 0.5% IPBC shampoo and 2.0% Ketoconazole shampoo resulted in similar antimicrobial effect. In addition, 1.0%,2.0% IPBC shampoo was more effective than 2.0% ketoconazole shampoo. After two and four-weeks of 1.0% IPBC shampoo treatment, there was significant reduction of scaling, itching in test group compared to control group. On the basis of these results, it can be concluded that 1.0% IPBC is more effective than 2.0% Ketoconazole in reducing dandruff. It seems that strong capacity of drug binding to the stratum corneum plays a role in its antidandruff effect since adsorption of active ingredients on scalp is very important factor in reducing dandruff.

• 수산해양교육연구
• /
• 제21권4호
• /
• pp.562-567
• /
• 2009

This study was conducted to evaluate of improving extruded pellet (EP) for growth of juvenile flounder by comparing with raw fish-based moist pellet (MP) diet. Two replicate groups of 80 fish per each tank (initial weight of $36.0{\pm}1.2 g$) were fed one of the three EPs (EP1, EP2 and CEP) and (MP for 16 weeks. Survival was not significantly affected by experimental diets (P>0.05). Weight gain of fish fed the MP was not significantly different from that of fish fed the EP1 & EP2 (P>0.05), but that of fish fed CEP was significantly lower than that of fish fed MP (P<0.05). Specific growth rate of fish fed the CEP was significantly lower than those of fish fed EP1, EP2 and MP (P<0.05). Feed efficiency of fish fed the EP1 was significantly higher than those of fish fed CEP and MP (P<0.05), but not significantly different from those of fish fed EP2 (P>0.05). The Contents of crude protein and crude lipid in whole body were significantly different among all groups (P<0.05). Therefore, these results strongly suggest that EP1 & EP2 diets could be developed to replace MP diet for flounder without adverse effects on growth performance.

• 열처리공학회지
• /
• 제22권3호
• /
• pp.149-154
• /
• 2009

Dense $5Cu_{0.6}Fe_{0.4}-Al_2O_3$ composite was consolidated from mechanically synthesized powders by pulsed current activated sintering method within 1 min. $5Cu_{0.6}Fe_{0.4}-Al_2O_3$ powder was synthesized from 3CuO and 2FeAI using the high energy ball milling. Dense $5Cu_{0.6}Fe_{0.4}-Al_2O_3$ with relative density of up to 95% was produced under simultaneous application of a 80 MPa pressure and the pulsed current. Mechanical properties and grain size of the composite were investigated.