• 제목/요약/키워드: stem density

검색결과 382건 처리시간 0.033초

전침자극이 Spontaneously Hypertensive Rat의 대뇌겉질, 뇌줄기, 소뇌 부위의 Nitric Oxide Synthase 신경세포에 미치는 영향 (Difference in NOS between 2 Hz and 100 Hz EA in cerebral cortex, brain stem and cerebellum of spontaneously hypertensive rats)

  • 김종인;김용석;김창환
    • Journal of Acupuncture Research
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    • 제18권4호
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    • pp.116-124
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    • 2001
  • Background and Objetive : The aim of this study was to investigate the effect of various electroacupuncture stimulation on NADPH-diaphorase in cerebral cortex, brain stem, cerebellum of spontaneously hypertensive rats. Materials and Methods : We evaluated the changes of NADPH-d-positive neurons using a histochemical method. The staining intensity of NADPH-d-positive neurons was assessed in a quantitative fashion using a microdensitometrical method based on optical density by means of an image analyzer. Results and Conculsion : The average optical density of NADPH-d-positive neurons of 100 Hz (bipolar square wave 0.2 ms duration and 100 Hz frequency) electroacupuncture treatment group significantly increased in most cortical areas comparison between the manual acupuncture and 2 Hz (bipolar square wave 0.2 ms duration and 2 Hz frequency) electroacupuncture groups. In the brain stem, the optical density of NADPH-d-positive neuron at only superficial gray layer of the superior colliculus area was same as cerebral cortex. We conclude that the morphological evidence for NADPH-d-positive neurons may be have regional change in cerebral cortex brain stem and cerebellum according to various electroacupuncture stimulations.

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Relationship between Maximum Stem Volume and Density during a Course of Self-thinning in a Cryptomeria japonica Plantation

  • Ogawa, Kazuharu;Hagihara, Akio
    • The Korean Journal of Ecology
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    • 제27권1호
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    • pp.27-33
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    • 2004
  • Cryptomeria japonica plantation was monitored every year during 15 years from 1983 to 1997 for stem diameter and volume. The reciprocal equation, 1/Y = A + B/N, was applied to the relationship between cumulative volume Y and cumulative number N from the largest tree in the stand each year. The parameters A and B, which means respectively the reciprocal of an asymptotic value of total stand stem volume and the reciprocal of the maximum stem volume, are related by a power function. The power functional relationship between A and B derived a linear relationship of B-points ( $N_{B}$, $V_{B}$; $N_{B}$ = B/A, $Y_{B}$ = 1/2A) of each Y-N curve on log-log coordinates. The gradient of B-point line was so steep that the Y-N curve moved parallel upward year by year. The time trajectory of mean stem volume (W) and density ($\rho$) provided evidence in favor of the 3/2 power law of self-thinning, because the gradient of W - $\rho$ trajectory on log-log coordinates approximated to -3/2 at the final stage of stand development. On the basis of the results of Y-N curves and W - $\rho$ trajectory, the time trajectory of maximum stem volume $W_{max obs}$ and $\rho$ was derived theoretically. The gradient of $W_{max obs}$ - $\rho$ trajectory on log-log coordinates is calculated to be -0.6105 at the final stage. The gradient of $W_{max obs}$ - $\rho$ trajectory was steeper than that of W - $\rho$ trajectory at the early stage, while the former is gentler than the latter at the later stage.stage.e.age.e.

Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea

  • Jung, Sung Cheol;Lumbres, Roscinto Ian C.;Won, Hyun Kyu;Seo, Yeon Ok
    • Journal of Ecology and Environment
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    • 제37권4호
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    • pp.177-184
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    • 2014
  • This study was conducted to develop allometric equations and to determine the stem density and biomass expansion factor (BEF) for the estimation of the aboveground and belowground biomass of Cryptomeria japonica in Jeju Island, Korea. A total of 18 trees were harvested from the 40-year-old C. japonica stands in Hannam experimental forest, Jeju Island. The mean biomass of the C. japonica was $50.4Mg\;ha^{-1}$ in stem wood, $23.1Mg\;ha^{-1}$ in root, $9.6Mg\;ha^{-1}$ in branch, $4.6Mg\;ha^{-1}$ in needle and $4.3Mg\;ha^{-1}$ in stem bark. The diameter at breast height (DBH) was selected as independent variable for the development of allometric equations. To evaluate the performance of these equations, coefficient of determination ($R^2$) and root mean square error (RMSE) were used and results of the evaluation showed that $R^2$ ranged from 71% (root biomass equation) to 96% (aboveground biomass equation) and the RMSE ranged from 0.10 (aboveground biomass equation) to 0.33 (root biomass equation). The mean stem density of C. japonica was $0.37g\;cm^{-3}$ and the mean aboveground BEF was $1.28g\;g^{-1}$. Furthermore, the ratio of the root biomass to aboveground biomass was 0.32.

Dynamics of shearing force and its correlations with chemical compositions and in vitro dry matter digestibility of stylo (Stylosanthes guianensis) stem

  • Zi, Xuejuan;Li, Mao;Zhou, Hanlin;Tang, Jun;Cai, Yimin
    • Asian-Australasian Journal of Animal Sciences
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    • 제30권12호
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    • pp.1718-1723
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    • 2017
  • Objective: The study explored the dynamics of shearing force and its correlation with chemical compositions and in vitro dry matter digestibility (IVDMD) of stylo. Methods: The shearing force, diameter, linear density, chemical composition, and IVDMD of different height stylo stem were investigated. Linear regression analysis was done to determine the relationships between the shearing force and cut height, diameter, chemical composition, or IVDMD. Results: The results showed that shearing force of stylo stem increased with plant height increasing and the crude protein (CP) content and IVDMD decreased but fiber content increased over time, resulting in decreased forage value. In addition, tall stem had greater shearing force than short stem. Moreover, shearing force is positively correlated with stem diameter, linear density and fiber fraction, but negatively correlated with CP content and IVDMD. Conclusion: Overall, shearing force is an indicator more direct, easier and faster to measure than chemical composition and digestibility for evaluation of forage nutritive value related to animal performance. Therefore, it can be used to evaluate the nutritive value of stylo.

무주지역 리기다소나무 임분의 지상부 바이오매스 추정 (Aboveground Biomass Estimation of Pinus rigida Stands in Muju Region)

  • 서연옥;이영진
    • 농업생명과학연구
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    • 제45권1호
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    • pp.15-20
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    • 2011
  • 본 연구는 전북 무주지역 36년생 리기다소나무 임분을 대상으로 지상부 바이오매스 추정식을 개발하고, 줄기밀도와 바이오매스 확장계수를 산출하고자 하였다. 리기다소나무의 흉고직경을 독립변수로 하고 바이오매스를 종속변수로 하는 상대생장식을 추정한 결과, 잎 (78%)과 가지 (83%)를 제외하면 모든 부위에서 결정계수가 95% 이상의 높은 설명력을 나타냈다. 리기다소나무의 바이오매스량은 줄기 목질부 $65.9 Mg\;ha^{-1}$, 줄기 수피 $9.5Mg\;ha^{-1}$, 가지 $19.6Mg\;ha^{-1}$, 잎 $7.0Mg\;ha^{-1}$, 전체 $102Mg\;ha^{-1}$로 나타났으며, 바이오매스 구성비는 줄기목질부 (64.6%) > 가지 (19.2%) > 줄기 수피 (9.3%) > 잎 (6.9%) 순으로 나타났다. 리기다소나무의 줄기밀도 $(g/cm^{3})$는 0.453으로 나타났고, 바이오매스 확장계수는 1.344로 나타났다.

사초용유채 ( Brassica napus Subsp. oleifera ) 의 생산성과 사료가치에 관한 연구 V. 재식밀도 차이가 사초용 유채의 생육특성, 수량 및 영양가치에 미치는 영향 (Studies on Productivity and Nutrient Quality of Forage Rape (Brassica napus Subsp. oleifera) V. Influence of plant density on growth, yield and nutrient quality of forage rape.)

  • 안계수;권병선
    • 한국초지조사료학회지
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    • 제9권2호
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    • pp.108-112
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    • 1989
  • To determine optimal plant density of forage rape in southern areas of Korea, Velox, the highest yielding variety among seventeen introduced varieties of forage rape, was grown under five different plant densities. The results obtained are summarized as follows: 1. Yield components such as stem diameter, number of main stem,leaves, number of branches and number of branch leaves and fresh yield were highest at the plots with 50cm row spacing and 30cm plant spacing. 2. Dry matter yield, content of crude protein, IVDMD and digestible dry matter yield were highest at the plots of broadcasting. 3. Since plants under high density were high in plant length and small in stem diameter, contents of crude fiber such as NDF, ADF, cellulose and lignin were lowest at the plots of broadcasting.

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Effect of Plant Density on Growth and Sugar Yield of Sweet Sorghum in Jeju Island

  • Oh, Hyeon-Do;Kim, Han-Lim;Kang, Young-Kil;Kim, Chan-Woo
    • 한국작물학회지
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    • 제46권1호
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    • pp.29-34
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    • 2001
  • A sweet sorghum [Sorghum bicolor (L.) Moench] cultivar was planted on 9 and 30 June 2000 at plant densities of 4, 6, 8, 10, and 12 plants $m^{-2}$ to determine the optimum plant density in Jeju region. There were no significant planting date x plant density interactions for most traits measured. Delaying planting from 9 to 30 June delayed 21 days in heading date, and significantly decreased plant height, the number of productive stems $m^{-2}$/, and lodging. Fresh stem yield tended to be higher at the 9 June planting date than at the 30 June planting date, but total sugar and ethanol yields were not significantly affected by planting date. Percentage of soluble solid was higher at the 30 June planting date compared with the 9 June planting date. Fresh stem, total sugar, and ethanol yields quadractically increased from 22.9 to 36.7 $t^{-1}$, from 1.66 to 2.54 $t^{-1}$, and from 945 to 1440 $L^{-1}$, respectively, with increasing plant density. The optimal plant densities for the maximum fresh stem, total sugar, and ethanol were estimated to be 10.7, 9.6, and 9.9 plants $m^{-2}$ respectively.

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자소(紫蘇)의 재식밀도(栽植密度)가 생육(生育) 및 수량(收量)에 미치는 영향(影響) (Influences of Planting Density on Growth and Yield of Perilla frutescens BRITTON var. acuta KUDO)

  • 박희진;김상곤;정동희;권병선
    • 한국약용작물학회지
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    • 제3권2호
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    • pp.135-139
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    • 1995
  • 전남(全南) 무안에서 1985년 4월부터 1986년 10월까지 2년간 4월 20일에 파종(播種), 5월 30일에 재식밀도(栽植密度)를 달리하여 이식(移植)하였을때 생육(生育)과 수양(收量)에 미치는 영향(影響)을 구명(究明)하였던바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 출수기(穗期)와 개화기(開花期)는 재식밀도(栽植密度)는 차(差)에 관계없이 8월 $14{\sim}15$일에 출수(出穗)하여 8월 19일${\sim}21$일에 개화(開花)하였으나 경장(莖長)은 $70{\time}40cm$의 재식밀도(栽植密度)에서 135cm로 가장 길었고 $80{\time}40cm$의 재식밀도(栽植密度)에서는 134cm로 1cm 정도 짧았다. 2. 생경엽중(生莖葉重)과 생자실중(生子實重)은 $80{\time}40m$의 재식밀도(栽植密度)에서 531kg/10a로 수량(收量)이 가장 높았다. 3. 경장(莖長)과 생엽경중(生葉莖重), 경장(莖長)과 생자실중(生子實重), 생엽경중(生葉莖重)과 생자실중(生子實重) 간(間)에는 $0.731^*,\;0.9024^{**},\;0.7425^*$로 정(正)의 상관(相關)으로 고도(高度)의 유의성(有意性)이 인정(認定)되었다. 4. 휴폭(畦幅)의 유의성(有意性) 검정(檢定)에서 경장(莖長)의 분산(分散)은 $55.67^{**}$, 생엽경중(生葉莖重)의 분산(分散)은 $268.50^*$, 생자실중(生子實重)의 분산(分散)은 $16.00^*$으로 고도(高度)의 유의성(有意性)이 인정(認定)되었고 주간(株間)의 유의성(有意性) 검정(檢定)에서 경장(莖長)의 분산(分散)은 $54.21^*$, 생경엽중(生莖葉重)의 분산(分散)은 $2,582.00^{**}$, 생자실중(生子實重)의 분산(分散)은 $48.00^{**}$으로 고도(高度)의 유의성(有意性)이 인정(認定)되었다. 따라서 자소재배(紫蘇栽培)의 적정 재식밀도(栽植密度)는 휴폭(畦幅) $80cm{\time}$매간(妹間) 40cm이었다.

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Measurement of Mechanical and Physical Properties of Pepper for Particle Behavior Analysis

  • Nam, Ju-Seok;Byun, Jun-Hee;Kim, Tae-Hyeong;Kim, Myoung-Ho;Kim, Dae-Cheol
    • Journal of Biosystems Engineering
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    • 제43권3호
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    • pp.173-184
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    • 2018
  • Purpose: This study was conducted to investigate the mechanical and physical properties of a Korean red pepper variety for particle behavior analysis. Methods: Poisson's ratio, modulus of elasticity, shear modulus, density, coefficient of restitution, and coefficient of friction were derived for "AR Legend," which is a domestic pepper variety. The modulus of elasticity and Poisson's ratio were measured through a compression test using a texture analyzer. The shear modulus was calculated from the modulus of elasticity and Poisson's ratio. The density was measured using a water pycnometer method. The coefficient of restitution was measured using a collision test, and the static and dynamic friction coefficients were measured using a inclined plane test. Each test was repeated 3-5 times except for density measurement, and the results were analyzed using mean values. Results: Poisson's ratios for the pepper fruit and pepper stem were 0.295 and 0.291, respectively. Elastic moduli of the pepper fruit and pepper stem were $1.152{\times}10^7Pa$ and $3.295{\times}10^7Pa$, respectively, and the shear moduli of the pepper fruit and pepper stem were $4.624{\times}10^6Pa$ and $1.276{\times}10^7Pa$, respectively. The density of the pepper fruit and the pepper stem were $601.8kg/m^3$ and $980.4kg/m^3$, respectively. The restitution coefficients between pepper fruits, pepper stems, a pepper fruit and a pepper stem, a pepper fruit and plastic, and a pepper stem and plastic were 0.383, 0.218, 0.277, 0.399, and 0.148, respectively. The coefficients of static friction between pepper fruits, pepper stems, a pepper fruit and a pepper stem, a pepper fruit and plastic, and a pepper stem and plastic were 0.455, 0.332, 0.306, 0.364, and 0.404, respectively. The coefficients of dynamic friction between a pepper fruit and plastic and a pepper stem and plastic were 0.043 and 0.034, respectively.

국화 'Baekma' 줄기경도에 미치는 재식밀도와 규산질비료 엽면시비 효과 (Effect of Planting Density and a Silicate Fertilizer on Strength of Stem in Chrysanthemum 'Baekma')

  • 최성열;이영란;허은주;신학기
    • 화훼연구
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    • 제17권3호
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    • pp.147-151
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    • 2009
  • 본 실험은 스탠다드국화 'Baekma'품종의 줄기공동에 의한 줄기 부러짐을 방지하기 위하여 수행하였다. 'Baekma' 품종의 줄기공동은 초장이 20 cm정도 되었을 때부터 시작되어 지제부로부터 5 cm 사이에서는 공동화가 상당히 진전되어 있었고, 이 후 발뢰를 하여 초장이 80 cm 정도 되는 생육 후반기에는 상부 20 cm만 남기고 모두 공동이 발생하였다. 절회장과 경경, 꽃목길이는 정식거리 $11cm{\times}11cm$에서 가장 좋았고, 수광량은 정식거리 $9cm{\times}9cm$ 대비 정식거리가 $10cm{\times}10cm$, $11cm{\times}11cm$, $12cm{\times}12cm$로 넓어질수록 각각 47, 99, 143% 증가하였다. 줄기의 경도와 강도는 정식거리 $11cm{\times}11cm$에서 줄기강도 $567kgcm^{-2}$, 경도 $1,339kgcm^{-2}$로 가장 높았다. 액상 규산질 비료의 엽면시비시 절화장과 절화중은 1회 시비에서 가장 좋았고, 개화소요일수는 무처리에서 가장 짧았다. 규산질 비료의 엽면시비에 따른 줄기의 경도와 강도는 무처리에 비하여 시비구에서 높았으며, $60mg{\cdot}L^{-1}$, 1회 시비에서 경도와 강도가 가장 높았다. 줄기의 Si 함량은 무처리에 비하여 농도가 높아질수록 시비회수가 많을수록 Si의 함량이 높아지는 경향을 보였고, $30mg{\cdot}L^{-1}$의 농도로 2회 시비한 처리에서 무처리 대비 2배 이상 함량이 높았다.