• 한국가금학회지
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• 제34권1호
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• pp.15-21
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• 2007

본 연구는 침엽수 추출물의 사료내 첨가 급여가 유기 육계의 생산성, 장기 변화 및 장내 미생물 변화에 미치는 영향을 구명하고자 실행하였다. 시험 설계는 대조구(C), 대조구+항생제 1.0%(+C), 침엽수 분말 3.0%(T1), 침엽수 추출물 0.05% (T2), 0.10%(T3) 첨가한 5개 처리구로 하였다. 처리구당 4반복, 반복당 10수씩 전체 200수 1일령 육계($Ross\;{\times}\;Ross$)를 35일간 평사에 배치하였다. 실험 전 기간의 증체량은 항생제 첨가구인 +C구와 침엽수 추출물 0.1% 첨가구인 T3구에서 제일 높았으며, 대조구와 침엽수 분말을 첨가한 T1구는 다른 처리구보다 낮았다. 사료 요구율은 T1구가 다른 처리구보다 현저하게 높았으며, +C와 T3에서 우수하였다. 소장무게는 대조구와 +C구가 제일 높았지만 처리구간에 통계적인 차이는 없었으며, 소장의 길이는 T1이 제일 길었으며, +C구가 다른 처리구에 비하여 유의적으로 짧았다(P<0.05). 근위 중량은 T2구가 유의적으로 가장 무거웠으며 (P<0.05), 비장 무게는 대조구가 가장 낮았지만(P<0.05), 맹장과 간 무게는 처리구간에 차이가 없었다. 융모 길이는 대조구가 다른 처리구에 비하여 길게 나타났으며(P<0.05). 장내 미생물도 대조구가 처리구보다 유의적으로 높거나 (P<0.05), 높은 경향을 보였다. 에너지 및 단백질 소화율은 대조구와 T1구에서 다른 처리구에 비하여 유의적으로 낮게 나타났다(P<0.05). IgG 농도는 대조구와 T1에서 다른 처리구에 비하여 상대적으로 낮게 나타났다. 본 실험 결과 침엽수 추출물의 급여는 부산물과 대조구에 비하여 사료의 영양소 이용율을 개선하였고, 성장도 개선하는 경향을 보였으며, 항생제 처리구와 동일한 경향을 나타내었다. 따라서 항생제 대체재로서 가능성을 보였으며, 유기육계 사육에 생산 능력을 개선하는 사료 첨가제로써 가치가 있었다.

• 생물환경조절학회지
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• 제19권4호
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• pp.246-250
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• 2010

본 실험은 희귀 자생식물인 백서향의 삽목 증식 특성을 구명하기 위해 수행되었다. 백서향은 남부지방 해변의 산기슭에 나는 상록관목으로 이른 봄에 향기가 아주 뛰어난 식물이다. 자웅이주식물로 국내에는 대부분 수나무가 많아 채종이 어려워 종자번식이 힘든 상황이므로 삽목 방법을 통해 증식을 시도하였다. 백서향의 삽목에 적합한 토양을 찾기 위해 펄라이트, 버미큘라이트, 펄라이트와 버미큘라이트 혼용(1 : 1), 모래로 4 처리를 수행한 결과, 발근율은 각각 86.7%, 95%, 75%, 95%로 나타났다. 온도를 달리히여 3처리로 삽목을 하였더니 발근율과 뿌리길이의 생육을 살펴볼 때 $27^{\circ}C$에서 생육이 우수하였다. 시기별로 6월 19일, 7월 19일, 8월 19일에 삽목한 결과 생존율, 발근율은 통계적으로 오차 범위 내에서 공통적으로 우수하였고, 그 중 7월 삽목의 뿌리생장이 가장 우수하였다. 백서향의 삽목증식은 펄라이트와 버미큘라이트를 혼용하여 7월에 삽수를 채취하고 생육기간 중 온도를 $27^{\circ}C$로 관리히는 것이 우수한 것으로 나타났다.

• 한국임상수의학회지
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• 제16권2호
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• pp.257-264
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• 1999

The objective of this study was to estimate the possibility of use as a crude feed about Korean pine foliage. Foliage was fermented aerobic and anaerobic state. And then, it was fed Korean native bull 5 to 6 month old. Bulls were fed control (n=4), aerobic fermented (n=4) and anaerobic fermented (n=4) feed 30 percent of total ration. Bulls were examined with blood sample and body weight on day 0, 60, 120 and 180. There were no differences on complete blood cell count serum chemistry and incidence of disease among groups for experiment period. Also, electrolytes (Ca, Mg, P) balance were good condition. Experimental feed did not induced toxicosis in kidney and liver, Fermented foliage and leaves of Korean softwood were efficient crude feed in carbohydrate, fat and protein metabolism. Experimental feed induced growth of Korean native bull body weight in growing stage without retard. In addition to anaerobic fermented feed has a more higher growth rate than control feed. Our conclusion is that fermented softwood substitute some part of ration, minimum 30 percent, in growing stage of a Korean native bull.

• 한국약용작물학회지
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• 제3권3호
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• pp.195-199
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• 1995

다(茶)나무 삽목(揷木)시 삽수(揷穗)의 종류(種類), 상토(床土)의 종류(種類), 생장조정제(生長調整劑) 등이 발근(發根)에 미치는 영향(影響)을 구명(究明)하고자 시험(試驗)을 수행한 결과(結果)는 다음과 같다. 1. 숙지삽(熟枝揷)보다 녹지삽(綠枝揷)에서 발근율(發根率)이 양호(良好)하며 최적(最適) 삽목시기(揷木時期)는 숙지삽(熟枝揷)의 경우 4월 10일경, 녹지삽(綠枝揷)의 경우 6월 10일경이었다. 2. 적정상토(適定床土)는 마사토(磨沙土)이며, 녹지삽(綠枝揷)과 숙지삽(熟枝揷)에서의 발근율(發根率)은 각각 71% , 87%였다. 3. 생장조정제(生長調整劑)인 Oxyberon과 Rootone의 효과(效果)는 숙지삽(熟枝揷)의 경우 대조구(對照區)에 비해 $4{\sim}9%$의 발근율(發根率)을 향상(向上)시켰으나 녹지소(綠枝揷)에서 는 그 효과가 미미(微微)하였다.

• Journal of the Korean Wood Science and Technology
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• 제21권3호
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• pp.53-60
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• 1993

Substrates used were hardwood-Suwon poplar-(Populus alba${\times}$glandulosa L.) and softwood-pitch pine-(Pinus rigida M.). And these substrates were steam exploded then treated with sodium chlorite at 75$^{\circ}C$ with occasional stirring in order to obtain samples which had different lignin contents and crystallinity. And then this resulting samples incubated with a commercial cellulase derived from Trichoderma ressei. The contents of Klason lignin were decreased as the increasing of the ratio of sodium chlorite in the two species. The effect of hardwood was more effective than that of softwood in the same ratio of sodium chlorite. The minimum contents of Klason lignin were 0.8% and 5.1% respectively. And the crystallinities of cellulose were increased very little as increasing of the ratio of sodium clorite. The hydrolysis extent of the two species were increased as the increasing of delignification. Especially, the hydrolysis extent of hardwood was more higher than that of softwood. The maximum hydrolysis extent were 89.8% and 71.1%, respectively.

• Journal of the Korean Wood Science and Technology
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• 제30권3호
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• pp.109-115
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• 2002

Mycelial growth of L. edodes by pretreatments of softwood was studied on a sawdust medium. The sawdust used was from the following softwood species : Larix leptolepis, Pinus densiflora and Pinus koraiensis. The pretreatment consisted of cold-water (48 h), hot-water (3 h) and steam extractions (3 h) at a ratio of 500 g : 3,000 mL (sawdust : distilled water). The sawdust medium was a mixture of 76% sawdust, 20% rice bran, 3% glucose, 0.4% potassium nitrate and 0.6% calcium carbonate. Following sawdust pretreatments proved most suitable : L. leptolepis (steam extraction), P. densiflora (hot-water extraction) and P. koraiensis (hot-water extraction). Mycelial growth on P. koraiensis sawdust increased in proportion to an increase in hot-water extraction time. Mycelial growth was optimum on the sawdust extracted for 12 hours, hot-water extraction beyond this period proved unsuitable. With the exception of P. densiflora at 100 ㎍/mL, antifungal activity occurred in every sample. Maximum inhibition of mycelial growth was obtained from following concentration of hot-water extractives : P. densiflora (10⁴ ㎍/mL) and P. koraiensis (10⁴ ㎍/mL). This study has provided useful preliminary information for the cultivation of L. edodes.

• 한국산림과학회지
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• 제96권2호
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• pp.222-226
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• 2007

This study developed the Korean roundwood import prediction model using vector autoregressive (VAR) method. The roundwood was divided into softwood and hardwood by species. The VAR model of roundwood import was specified with two lagged endogenous variables, that is, roundwood import volume and roundwood import price. The results showed that the significance levels of F-statistics in the softwood and hardwood roundwood import equations rejected the hypothesis that all coefficients are zero. So, we concluded that roundwood import volume can be explained by lagged import volume and lagged import price in Korea. The coefficient signs of all variables were as expected. Also, the model has good explanatory power, and there is no autocorrelation.

• Journal of the Korean Wood Science and Technology
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• 제24권4호
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• pp.40-46
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• 1996

It is well-known fact that dimensional stability of wood is greatly enhanced by acetylation of wood. This dimensional stability results from bulking of the reacted acetate within the cell wall, which reduces further swelling when the modified woods corne into contact with water or water vapor. The purpose of this research was to determine the water absorption and dimensional stability of the acetylated solid wood in liquid water and in humidity tests. Radiata pine, Siberian larch, and Japanese larch were acetylated. Antiswelling efficiency(ASE) and equilibrium moisture content(EMC) of acetylated wood, at 95% RH and $20^{\circ}C$ after 4weeks, was quite dependent on WPG, but was not dependent on species.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.27-28
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• 2011

This research aims to secure fundamental data for the development offire-retardant wood by soaking dried wood in fire-retardant liquid. To dry wood, optimal drying conditions for softwood usually used as structural material and hardwood usually used as finishing or furniture material were derived by varying the microwave outputs and heating times of microwave wood drying equipment. The research foundthat each specimen needs 8 to 15 minutes of heating time depending on water content and output. For softwood, fire-retardant liquid equivalent to about 10 percent of the total mass of the specimen infiltrated into the dried wood, of which the water content was reduced to 5~6 percent.

• 한국조경학회지
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• 제18권3호통권39호
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• pp.137-141
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• 1990

This study was carried out to investigate the propagation methods of the Rhododendron micranthum as a landscape plant The results obtained are as follows :　1. The optimum temperature for seed germination was $20^{\circ}C$, and the seed germination needs light. 2. GA and thiourea did not affect the seed germination under light, but GA gad substitutive effect. 3. 87% and over of germination rates were obtained in room temperature and $5^{\circ}C$ dry storages. 4. The rooting rate was high on sandy loam, vermiculite, and vermiculite 50%+sand 50%, at softwood and hardwood cutting(hardwood ; 45~48%, softwood ; 45~48%). 5. The significant effects on rooting were found with the treatment of NAA 500~2000ppm.