• Title/Summary/Keyword: growth environment characteristics

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Characteristics of Microalgal Growth on Anaerobic Effluent of Animal Waste (축산분뇨 혐기성 처리수에서 미세조류의 성장특성)

  • Lim, Byung-Ran;Lee, Kisay;Noh, Seung You;Park, Ki Young
    • Journal of Korean Society on Water Environment
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    • v.24 no.3
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    • pp.306-310
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    • 2008
  • Characteristics of microalgal growth was investigated using anaerobic effluent from two-phase animal waste digestor as substrate. Batch experiments were carried out to investigate the effect of the initial nitrogen and phosphorus concentrations on growth of Microcystis aeruginosa, Chlorella sp. and Euglena gracilis. In 400 times diluted anaerobic effluent (TN 3 mg/L), single cell growth of the Euglena gracilis population increased twice without delay, although Chlorella sp. and Microcystis aerugenos take over 144 hours. Similar appearance with single cell growth was observed in mixed cultures. However, microalgae population did not increase under condition of 10 times diluted influent (TP 3 mg/L) in both pure and mixed cultures, which was affected by high organic and nitrogen concentration. Logistic growth model successfully fitted to determine biokinetic parameters such as ${\lambda}$: lag time, ${\mu}m$: maximal specific growth rate, A: asymptote of growth.

Age and growth of the black rockfish, Sebastes inermis, in the Jeonnam marine ranching area in the southern Sea of Korea (한국 남해 전남바다목장해역 볼락, Sebastes inermis의 연령과 성장)

  • Kim, Hee-Yong;Kim, Sang-Hwa;Huh, Sun-Jung;Seo, Young-Il;Lee, Sun-Gil;Ko, Jun-Chul;Cha, Hyung-Kee;Choi, Mun-Sung
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.46 no.4
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    • pp.346-357
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    • 2010
  • Characteristics of age and growth of the black rockfish, Sebastes inermis sampled in the Jeonnam Marine Ranching Area (JMRA) around Geumo Islands south of Yeosu were investigated using 642 otoliths from March 2009 to February 2010. The opaque zone was formed in September once a year and hence it was used as an annulus. The parturient period was December to January, and therefore the duration from fertilization to the complete formation of the opaque zone was nineteen months. From the parameters calculated using the average length when the year ring was formed, growth of S. inermis were expressed by von Bertalanffy growth equation as $L_t$=23.267 ($1-e^{-0.4406(t+1.1971)}$) for females and $L_t$=22.030 ($1-e^{-0.5312(t+0.6834)}$) for males when is total length in age t. Through the growth equations, the maximum length was determined as 23.27cm for females and 22.03cm for males and the growth factor as 0.4406/yr and 0.5312/yr, respectively. Finally, the growth of female S. inermis is larger than the one of male S. inermis.

Analysis of Growth Characteristics Using Plant Height and NDVI of Four Waxy Corn Varieties Based on UAV Imagery

  • Jeong, Chan-Hee;Park, Jong-Hwa
    • Korean Journal of Remote Sensing
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    • v.37 no.4
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    • pp.733-745
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    • 2021
  • Although waxy corn varieties developed after the 1980s show differences depending on development stages and conditions, studies on the characteristics of waxy corn during the growth stage are rare. The subject of this study was a field survey and unmanned aerial vehicle (UAV) image acquisition of four waxy corn varieties cultivated in Idam-ri, Gammul-myeon, Goesan-gun, Korea. The study was conducted in four stages at intervals of two weeks after planting in 2019. The growth characteristics of each of the four varieties were analyzed using growth curves obtained based on field survey and UAV imagery data. The characteristics of each growth stage of the four varieties of corn, as assessed using normalized difference vegetation index (NDVI) and plant height (P.H.) values, were as follows. The growth model was identified as a model in which three-parameter logistic (3PL) curves reflect the growth characteristics of corn well. In particular, it was found that the variations in growth rate shown by P.H. and NDVI values clearly explain the differences between corn varieties. Among the four cultivars, growth and development first occurred at the early vegetative stage in Daehakchal, followed by Mibaek 2, Miheukchal, and finally Hwanggeummatchal. The variationsin P.H. and NDVI were achieved quickly and earlier in Daehakchal, followed by Mibaek 2, Hwanggeummatchal, and Miheukchal. It was confirmed that these results reflected the characteristics of the fast white-type varieties, while the black-type varieties were delayed, as in a previous study. These results reflect the resistance to lodging that affects the cultivation environment and the response characteristics to nutrients and moisture. It was confirmed that UAV accurately provides growth information that is very useful for analyzing the growth characteristics of each corn variety.

Growth Characteristics and Native Environment of Dendropanax morbifera LEV. in Wando, Korea (완도(莞島)지역 황칠나무의 자생지 환경 및 생육특성)

  • Choi, Seong-Kyu
    • Korean Journal of Medicinal Crop Science
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    • v.4 no.1
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    • pp.1-6
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    • 1996
  • This environment of native area and growth characteristics by different age of dendropanax morbifera was grown wild widly at Wando area, particularly, distribution frequency was high at 50 to, 150 meters above the sea level, and configuration of the ground of native area descended slowly toward the southeast. The Soil characteristics of native area was $pH\;5.3{\sim}5.4,\;8.4{\sim}9.8%$ in organic matter content and $18.2{\sim}21.3%$ in soil moisture. The flowering of dendropax morbifera was began at 6 years old tree, and flowering time was at middle of July. The growth characteristics of 6 years old tree was 129cm in stem height, 34mm in stem diameter, 15.4 in number of leaf, and 12.9 cm in petiole length.

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Correlation Analysis between Growth and Environmental Characteristics in Abeliophyllum distichum Habitats (미선나무 자생지의 생육특성과 환경특성간의 상관분석)

  • 유주한;조흥원;정성관;이철희
    • Korean Journal of Environment and Ecology
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    • v.18 no.2
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    • pp.210-220
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    • 2004
  • The purpose of this study is to propose the raw data of conservation and restoration by analyzing the environmental and growth characteristics in Abeliophyllum distichum habitats. The types of soil were sandy loam, loam and silty clay loam and the correlation on chemical characteristics of soil appeared that T-N and C.E.C were highly correlative. In case of growth characteristics, height and diameter in 1st site, crown in 2nd site, number of leaves in 5th site and number of seeds in 4th site were better than other sites. In the results of correlation on growth characteristics, height and diameter were highly correlative. In case of growth and chemical characteristics, EC and height were highly correlative. In the results of regression analysis, R-square of height and EC was some 70.4% and that of number of leaves and T-N was some 70.2%. To conserve and restore Abeliophyllum distichum habitats, there were demanded that the accurate environmental analysis that considered such diverse factors as light intensity, temperature, genetic quality and so forth.

Differences in environment, KSFs, CEO roles, and the external linkage among Korean ventures at different growth stages (우리나라 벤처기업의 성장단계에 대한 실증분석 연구)

  • 김영배;하성욱
    • Proceedings of the Technology Innovation Conference
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    • 1999.12a
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    • pp.123-158
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    • 1999
  • This study examines the differences in the various characteristics of the firms along their growth stage based on the survey data of 2,515 Korean ventures. Venture characteristics include KSFs(Key Success Factors), environment attributes of their product markets, CEO roles, the use of OPR(Other Peoples Resource). Growth stage of the ventures are classified by their dominant management problems: foundation, the market launch of the first proprietary product or service, The Outset of second generation product or service, and the Initial Public Offering (IPO) and stabilization. The results of this study show substantial differences in many aspects among firms at different growth stages. Although common KSFs exist, KSFs are changing as the venture evolves. Differences in KSFs and environmental attributes along growth stage require CEO to do different role in business process. Different kinds and amounts of external resources are needed according to their growth stage. However, almost all of external resources are offered to ventures in later stage. Entrepreneurs need to change their role, as their firms grow, from visioning and strategic role to marketing and production emphasized role. Based on the results, this study suggests a number of new government policies and future research ideas. Other implications and limitations of this study are also noted.

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A Study on Physicochemical Properties of Artificial Substrates and Changes of Plant Growth in Tropical Plant Resources Research Center of Korea National Arboretum (국립수목원 열대온실 내 인공배합토의 물리화학적 특성 및 식물 생육 변화에 관한 연구)

  • Song, Jeong-Hwa;Jin, Hye-Young;Ahn, Tai-Hyeon
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.13 no.2
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    • pp.52-62
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    • 2010
  • This study was carried out in the Tropical Plant Resources Research Center of Korea National Arboretum to determine the optimum edaphic environment for the growth of tropical and subtropical plants. The physicochemical properties of artificial substrates and the growth characteristics of tropical and subtropical plants were investigated. Subtropical plants exhibited a high growth rate when cultivated in a substrate of Dry Zone that had physical properties similar to those of arid native soil. Mediterranean plants showed a low growth rate when grown in a substrate of Subtropical Zone that required changes in acidity. The substrate of Tropical Zone had high organic matter and mineral contents and therefore had good physical properties:this substrate has a good environment for the stimulation of the growth of tropical plants. Our results indicate that the chemical properties such as pH and mineral contents of most artificial substrates need to be more urgently improved than their physical properties in order to ensure better growth of tropical and subtropical plants. Initial management strategies for the construction of new tropical greenhouses were formulated, and data from monitoring studies will be continuously gathered and incorporated in the manual to keep it updated.