• Title, Summary, Keyword: Growth

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Effects of Calcium, Vitamin D and Egg Yolk Peptide Treatment on the Retardation of Longitudinal Bone Growth Induced by Low-Calcium Diets (저칼슘 식이로 유발한 성장 저하 흰쥐에 대한 칼슘, 비타민 D 및 난황 펩타이드의 투여가 장골 길이 성장에 미치는 영향)

  • Kim, Myung-Gyou;Kim, Hye Kyung;Leem, Kang-Hyun
    • The Korea Journal of Herbology
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    • v.29 no.5
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    • pp.31-38
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    • 2014
  • Objectives : Egg yolk is composed of various important chemical substances for human health. A calcium shortage causes the growth retardation on the body growth. In this study, we examined the therapeutic effects of calcium, vitamin D and egg yolk peptide (EYP) treatment on the retardation of the longitudinal bone growth induced by low-calcium diet in adolescent rats. Methods : Low calcium diets were administrated for 15 days. During the last five days, calcium and/or vitamin D and/or EYP were administrated. The body weights, longitudinal bone growth rates, the heights of growth plates, and bone morphogenetic protein (BMP)-2 and insulin-like growth factor (IGF)-1 expressions were measured using histochemical analysis. Results : Low calcium diets caused the significant reduction in body weight gains and the longitudinal bone growth. The heights of growth plates and the expressions of BMP-2 and IGF-1 showed the impairment of body growth as well. Calcium and/or vitamin D administration could not significantly increase the longitudinal bone growth. However, calcium, vitamin D, and EYP administration significantly increased the bone growth, the growth plate height, and BMP-2 and IGF-1 expressions. Conclusions : These results suggest that EYP enhances the longitudinal bone growth in the calcium and/or vitamin D deficiency and it could be a promising agent for the treatment of children suffering from malnutrition.

Analysis on the Drivers of Growth in Forestry Sector and Growth Projection through Growth Accounting Analysis (성장회계분석을 통한 임산업의 성장요인분석과 전망)

  • Lee, Yohan;Jung, Jaeho;Min, KyungTaek
    • Journal of Korean Society of Forest Science
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    • v.104 no.4
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    • pp.677-684
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    • 2015
  • This study analyzed a long-run growth trend of the forestry sector in the Republic of Korea, and forecasted the potential growth in the future after investigating main drivers of growth in the forestry sector through growth accounting analysis. Based on results, we finally suggested a direction to go forward in order to achieve a sustainable growth in the field. After Asia financial crisis, the growth rate of the forestry sector was getting stable with the fast recovery of Korean economy. While the main drivers of growth in the field was labor and capital accumulation in 1980s and 1990s, the main driver of growth has been the increment of capital accumulation since 2000. As the result of our analysis for forecasting the potential growth in the field, the contribution of labor, capital, TFP in total growth is expected as 0.09%, 1.58%, and -0.01%, respectively. The potential growth rate of the forestry sector during 2012-2020 is predicted to be 1.65% and the total production will become 36.25 trillion won.

Biotechnologies for Improving Animal Metabolism and Growth - A Review

  • Chen, Daiwen
    • Asian-Australasian Journal of Animal Sciences
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    • v.14 no.12
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    • pp.1794-1802
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    • 2001
  • Biotechnology will play critical role in improving animal productivity. Animal growth rate and muscle deposition potential can be greatly improved by the application of biotechnology and biotechnological products. Administration of recombinant somatotropin (ST) or other compounds such as IGF-1 and growth hormone-releasing peptides (GHRPs) can enhance growth rate and carcass lean percentage. Gene transfer offers a powerful approach to manipulate endocrine system and metabolic pathways toward faster growth and better feed efficiency. Biotechnology is also extensively used for improving metabolism and activity of gut microorganisms for better nutrient digestibility. Knockout of growth-inhibiting genes such as myostatin results in considerable acceleration of body weight and muscle growth. Animal growth can also be improved by the use of gene therapy. Immunomodulation is another approach for efficient growth through controlling the activity of endogenous anabolic hormones. All the above aspects will be discussed in this review.

Prediction of Crack Growth Retardation Behavior by Single Overload (단일 과대 하중에 의한 균열 성장 지연 거동 예측)

  • 송삼흥;최진호;김기석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.928-932
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    • 1996
  • Single overload fatigue tests with overload sizes ranging from 50% and 100% have been performed to investing ate the fatigue crack growth retardation behavior. A modified and experimental method of Willenborg's model for prediction of crack growth retardation behavior has been developed, based on evaluations of equivalent plastic zone size (EPZS) changing its size along the overload plastic zone boundary. The minimum crack growth rates of each overload size are linearly decreased with overload size increasing, but fatigue lives extended by single overload are increasing much more unlike the crack growth rates. Comparisons of crack growth behavior predicted by EPZS model and Willenborg model have shown that the EPZS model accounts for overload effects better than Willenborg model. These effects include delayed retardation, large retardation region, minimum crack growth rate, and the increase rate of crack growth rate in the region crack growth rate recovered.

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Kinetic Analyses of Spermine Effects on Petiole Elongation in Ranunculus sceleratus

  • Chang, Soo-Chul
    • Journal of Plant Biology
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    • v.37 no.4
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    • pp.397-402
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    • 1994
  • Possible roles of polyamines in the inhibition of cell elongation in Ranunculus petioles were investigated. Exogenously apoplied polyamines greatly inhibited the auxin-induced petiole growth, while treatment of the tissue with $\alpha$-difluoromethylarginine, the inhibitor of putrescine biosynthesis, further enhanced the growth in the presence of IAA. Inhibitory effect of spermine can also be apparent for fusicoccin-induced elongation, but not for growth induced by a low pH. Spermine also suppressed the ethylene-enhanced growth in the presence of auxin. Using computer-based video digitizer system, the inhibitory effects of spermine on petiole growth were kinetically analyzed. Auxin-induced growth was characterized by an initial and transient growth with a highly elevated rate followed by a steady growth with a slightly reduced rate. Spermine treatment was found to shorten the duration of the initial phase of growth, and to reduce the rates of both the initial and steady growth as well. The latent period for auxin induction was not affected by spermine.

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Effects of Cervi Pantotrichum Cornu and Cervi Cornu on Longitudinal Bone Growth in Adolescent Male Rats (녹용(鹿茸)과 녹각(鹿角)의 성장기 흰쥐 장골 길이성장에 대한 효과)

  • Kim, Ki-Tae;Kim, Myung-Gyou;Leem, Kang-Hyun
    • The Korea Journal of Herbology
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    • v.21 no.1
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    • pp.63-69
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    • 2006
  • Objectives : This study was designed to investigate the effects of Cervi Pantotrichum Cornu and Cervi Cornu on the growth of longitudinal bone in the adolescent male rats. Methods : Longitudinal bone growth was measured by fluorescence microscopy. To examine the effects on the growth plate metabolism, the heights of growth plate and the induction of local bone morphogenetic protein-2 were measured. Results : Treatment of Cervi Pantotrichum Cornu significantly enhanced longitudinal bone growth compared with control group. However, Cervi Cornu did not show the significant effects. Conclusion : Cervi Pantotrichum Cornu enhanced longitudinal bone growth and promoted the induction of local bone morphogenetic protein-2 of growth plate in adolescence male rats.

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Aggregate Productivity Growth in Korean Manufacturing: The Role of Young Plants

  • KIM, MINHO
    • KDI Journal of Economic Policy
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    • v.39 no.4
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    • pp.1-23
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    • 2017
  • I measure aggregate productivity growth in manufacturing between 1995 and 2013 as defined by Petrin and Levinsohn (2012). I decompose aggregate productivity growth into technical efficiency improvements, resource reallocations, and net entry effects. I find that aggregate productivity growth slows down after 2004 and that the rapid drop in technical efficiency growth contributed most to the decline. In this paper, I focus on the role of young plants with regard to productivity growth of Korean manufacturing. I show that young plants account for nearly half of APG (48%), while their value-added share is 14 percent on average between 1995 and 2013. I find that productivity growth at young plants has been declining for the last ten years. The lower growth of continuing young plants contributes to this trend. These results stress the important role of young plants in aggregate productivity growth and imply that understanding the dynamics of young plants is necessary to form effective start-up policies.

Selection of a Predictive Coverage Growth Function

  • Park, Joong-Yang;Lee, Gye-Min
    • Communications for Statistical Applications and Methods
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    • v.17 no.6
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    • pp.909-916
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    • 2010
  • A trend in software reliability engineering is to take into account the coverage growth behavior during testing. A coverage growth function that represents the coverage growth behavior is an essential factor in software reliability models. When multiple competitive coverage growth functions are available, there is a need for a criterion to select the best coverage growth functions. This paper proposes a selection criterion based on the prediction error. The conditional coverage growth function is introduced for predicting future coverage growth. Then the sum of the squares of the prediction error is defined and used for selecting the best coverage growth function.

Effects of Medium Components and Growth Regulators on Callus Development and Shoot Regeneration from Shoot Explants of Black Locust (Robinia pseudoacacia)

  • Shin, Dongill;Han, Kyung-Hwan;Sul, Ill-Whan
    • Journal of Life Science
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    • v.9 no.1
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    • pp.50-53
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    • 1999
  • Effects of growth regulators and medium components were tested for shoot multiplication and callus growth from shoot explants of black locust. During shoot multiplication, callus growth at the cut end of shoot explants proceeded shoot development. The basal callus growth seemed to be a function of both mineral components and cytokinin supplemented in the medium. Maximum callus growth was induced by 0.5${\mu}$M BAP and the callus growth decreased as the level of BAP increased. Positive correlations were found between basal callus growth, and shoot multiplication and growth. Shoot multiplication was greatest on BSM medium (black locust shoot culture medium) supplemented with 1 $\mu$M BAP. With medium containing high nitrogen content, both shoot multiplication and growth were significantly enhanced. A new BRM medium was the most effective for rooting of black locust among three rooting media tested.

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Suitable Conditions for Mycelial Growth of Phellinus spp.

  • Hur, Hyun;Imtiaj, Ahmed;Lee, Min-Woong;Lee, Tae-Soo
    • Mycobiology
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    • v.36 no.3
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    • pp.152-156
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    • 2008
  • The fungus Phellinus is a mushroom that is widely used medicinally. The optimal conditions for mycelial growth of 13 strains of the fungus were investigated. Mycelial growth was optimal at 25$^{\circ}C$ and was uniformly minimal at 15$^{\circ}C$ and 35$^{\circ}C$. Growth was optimal at pH 6$\sim$7. The mycelial phenotype was best promoted by growth using Potato Dextrose agar, Hamada, Glucose peptone, and Yeast-Malt media, whereas Czapek Dox, Hennerberg, and Lilly media were the most unfavorable for the mycelial growth of Phellinus spp. Glucose, sucrose, fructose, and dextrin were the most suitable carbon sources for mycelial growth, while lactose, maltose, and galactose were unsuitable. Among tested nitrogen sources, ammonium phosphate, potassium nitrate, and arginine best promoted mycelial growth, while alanine, urea, and histidine least promoted mycelial growth.