• Title/Summary/Keyword: Morphological change

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Variation of the Morphological Characteristics in the Accessions of Zoysia Species and Their Hybrid Lines (Zoysiagrass 수집계통들과 종간교배계통들의 형태적 특성들의 변이)

  • 김형기;김기선;주영규;홍규현;김경남;이재필;모숙연;김두환
    • Asian Journal of Turfgrass Science
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    • v.10 no.1
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    • pp.1-11
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    • 1996
  • Fifty accessions in Zoysia species and forty-one hybrid lines were evaluated in order to detect analyze the genectic variation of Zoysiagrasses and to obtain the basic information for breeding. 1.Plant height ranged from 13 to 34.5cm, leaf length from 7 to 26cm, leaf width from 2 to 7mm, and first leaf height from 1.1 to 8.5cm 2. The correlations among plant height, leaf length and first-leaf height were high, but leaf Width was correlated only With leaf length. 3. Stolon length was varied from 10 to 108cm, number of stolons from 12 to 53, internode length from 2 to 6.1cm and coverage percentage from 10 to 90%. 4.There were correlation among stolen length, number of stolons, internode length and coverage percentage except between stolen and internode length. 5.M1J and MC2 showed the highest level in stolen length, number of stolons and coverage percentage. Therefore they will be the best breeding materials for the purpose of fast covering. 6.According to the analysis on October 26, 1995, yellow color-change rate of leaves ranged from 5 to 85%, red color-change from 0 to 75% and sum of yellow and red change from 20 to 95%. Speciallty M2M1 and FL-41 kept green color untill early December, indicating that they had the late dormancy. 7. Visual assessment of stolon length and number of stolons, showed similar tendency With actually measured data. 8. Shoot density was very high in M2M1 and S2, and showed negative correlation with leaf width. 9. It is known in Korea that the darker green color of lawngrass is, the better it looks. There were 11 lines with dark green color leaves such as J 85-10, Meyer in Z. japonira, one asacession in Z. matrella and M2M1, M2S8, JM2, 55C2 in hybrid lines.

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Regional Morphological and Mechanical Characteristics in the Human Thoracic Vertebral Trabecular Bones (인체 흉추 해면골의 영역별 형태학적 및 기계적 특성 연구)

  • Lee, Tae-Woo;Woo, Dae-Gon;Ko, Chang-Young;Kim, Han-Sung
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.1
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    • pp.134-141
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    • 2010
  • This study analyzed the regional morphological and mechanical characteristics of vertebrae by using micro-computed tomography (micro-CT) and micro finite element analysis (FEA). For the present study, the $12^{th}$ human thoracic vertebral bones (an 85-years female and a 48-years male) were used. These were scanned by using micro-CT. Structural parameters were evaluated from the acquired 20 image data for fifteen $4{\times}4mm^2$ regions (five regions in respective layers of superior, middle and inferior part) in the thoracic vertebral trabecular bones. $4{\times}4{\times}4mm^3$ cubic finite element models of each regions were created at $70{\mu}m$ voxel resolution to investigate effective modulus ($E^+$). The present study indicated that there were significant differences in morphological and elastic mechanical characteristics of each region. There are close relationship between effective modulus and structural model index (SMI) in the bone of the 48-years male and between effective modulus and bone volume fraction (BV/TV) in the bone of the 85-years female. In addition, the effective modulus of central regions is about 80% stiffer than that of lateral regions at transverse plane. These findings may be likely to explain the previous result that a change of loading distribution of the vertebral trabecular bones is caused by spinal curvature and nucleus pulpous degeneration of the intervertebral disc.

Geosmin and Morphological Characteristics of Anabaena circinalis, Obtained from the Bukhan River (북한강에서 출현한 Anabaena circinalis의 형태학적 특성 및 지오스민(geosmin) 발생 양상)

  • Youn, Seok Jea;Kim, Yong-Jin;Kim, Hun Nyun;Kim, Jin-Yong;Yu, Mi-Na;Lee, Eun Jeong;Yu, Soon Ju
    • Journal of Environmental Science International
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    • v.27 no.1
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    • pp.27-38
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    • 2018
  • This study was carried out in the Bukhan River in the summer of 2014 and 2015, to identify the relationship between geosmin and the morphological changes in Anabaena. Identification of Anabaena was conducted using morphological and molecular analyses. Anabaena in this study was similar to Anabaena circinalis, A. crass, and A. spiroides with regard to regular coils, vegetative cell, akinete shape, and size, hoever, it was distinguishabl from A. crass and A. spiroides because of its larger trichome coil size. Additionally, the sequences of phycocyanin (PC) gene from Anabaena showed a 99% genetic similarity with A. circinalis NIES-1647 strain. The coil diameter of trichome ranged from 106 to $899{\mu}m$, and the diameter and abundance showed an insignificant positive correlation (r=0.544, p<0.05). The result of relationship between the coil diameter and the cell number per 360-degree rotation was kept at $33.8{\pm}5.2$ cells per $100{\mu}m$ diameter despite variable diameter. The average geosmin concentrations in 2014 and 2015 were investigated to be 99 ng/L and 35 ng/L, respectively. A. circinalis cell density contributed considerably to the change in geosmin and was positively correlated with geosmin concentration (2014; r=0.599, p<0.01, 2015; r=0.559, p<0.01). Our results suggest that geosmin and coil diameter could be estimated with the help of cell density.

Effect of Environmental Stress on Morphological Change of an Extremely Cadmium-Tolerant Yeast, Hansenula anomala B-7

  • Huh, Nam-Eung;Choi, Nack-Shick
    • Journal of Microbiology and Biotechnology
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    • v.9 no.1
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    • pp.70-77
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    • 1999
  • An extremely cadmium-tolerant budding yeast, Hansenula anomala B-7 underwent a morphological switch in response to either heat shock treatment or cadmium stress, respectively. It exhibited a morphological transition from a unicellular yeast form to a pseudohyphae-like coagulation when subjected to prolonged heat shock treatment. In contrast, the yeast cells showed an irregularity in surface morphology when given thermal stress for a short time. Patterns of proteins expressed in the pseudohyphae-like cells demonstrated that several proteins were overexpressed while others were underexpressed in comparison with those prepared from the cells in the yeast form. It was a striking feature, however, that nearly 40% of the proteins extracted from the cells in the pseudohyphae form appeared to be composed of a single polypeptide. This polypeptide was apparently overexpressed during the pseudohyphae phase and its molecular weight was estimated to be 58 kDa according to SDS-PAGE analysis. However, a significant level of the protein was not observed in the cells before transition to pseudohyphae. The architecture of the cell shape was also damaged when incubated in a medium containing more than 1,000 ppm (8.9mM) of cadmium ions, although able to proliferate at a slow rate. However, the irregularity in the cell morphology exerted either by the brief heat shock treatment or by the cadmium stress with the high concentrations of the metal ions was not repaired, even though the damaged cells were allowed to grow for sufficient time in fresh, cadmium-free medium.

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The Differences in Motivation and Usage according to Morphological evolution of SNS - Focusing on university students' use of Facebook and Instagram - (SNS의 형태적 진화에 따른 이용동기 및 사용행태 차이 - 대학생의 페이스북과 인스타그램 이용을 중심으로 -)

  • Shin, Hyun-Hee;Kim, Kyung-Ran
    • Journal of Digital Convergence
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    • v.15 no.6
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    • pp.155-164
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    • 2017
  • The purpose of this study is to analyze the similarities and differences between motivation and usage according to morphological differences between Facebook and Instagram. The formative differentiation of third-generation SNS such as intuitive image and limited network poses the necessity of recognizing individual service users as distinct groups in SNS research. Therefore, this study was conducted to analyze the differences of motivation and usage, according to the motivation of using Facebook and Instagram by 255 university students. As a result, 7 factors were found as motivation for SNS use, and there were therein motivational differences between Facebook and Instagram users. This study is expected to contribute to the prediction of user's attitude change according to the morphological evolution of SNS in the future, and to expand the application to such related fusion research as GUI design and corporate PR marketing.

An Improved Asterias Amurensis Recognition Method Based on Morphological Characteristics Analysis Techniques (형태적 특징 분석 기법을 이용한 아무르불가사리의 개선된 인식 방법)

  • Shin, Hyun-Deok;Jeon, Young-Cheol
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.10
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    • pp.61-69
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    • 2012
  • The population of highly prolific, predatory Asterias amurensis is growing sharply from year to year along the coastline of Korea, a nation surrounded by water on three sides. To make matters worse, the fact that Asterias amurensis devours living fish and shellfish has caused a heavy loss for fishermen involved in the aquaculture industry. What it all boils down to is the significance of technologies allowing one to recognize Asterias amurensis individuals using underwater images for the purpose of exterminating Asterias amurensis or identifying a change in the population of Asterias amurensis or the migration route of Asterias amurensis. An improved Asterias amurensis recognition method based on the morphological characteristics of Asterias amurensis was proposed in this paper. The proposed recognition method aimed at cases marked by the lack of extraction information on concaveness and convexity, which are the morphological characteristics of Asterias amurensis. Extracting all the characteristics of Asterias amurensis from images taken underwater is very difficult. In this respect, the proposed recognition is effective in terms of recognizing individuals in a diversity of Asterias amurensis images. As a result of the experiment, Our proposed method has achieved superior performance with 92.5% than other method.

Recent Morphological Changes off the Shoreface of Jinwoodo and Sinjado in the Nakdong River Estuary: 2007-2012 (낙동강 하구역 진우도와 신자도 전면의 최근 지형 변화: 2007년-2012년)

  • Park, Jinku;Khim, Boo-Keun;Lee, Hee Jun;Lee, Sang Ryong
    • Ocean and Polar Research
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    • v.36 no.2
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    • pp.87-101
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    • 2014
  • Recently, more attention has been paid to the geomorphological changes in the Nakdong River Estuary, because those changes are caused by artificial activities including weirs, reclamation and construction. In order to analyze quantitatively the recent geomorphological variability in the Nakdong River Estuary, we surveyed the depth and elevation of submarine topography near Jinwoodo and Sinjado from March 2007 to February 2012. A statistical method (based on Digital Shoreline Analysis System) and an Empirical Orthogonal Functions method were used to evaluate the morphological changes. According to the statistical variables (DCE, NDC, EPR, LRR), the highest amount and rate of accumulation were recorded around the Gadeokdo whereas the greatest amount of erosion appeared around the coast off the eastern part of Sinjado. In particular, a dynamic variation of morphology was clearly observed in the vicinity of the sub-tidal channel located between Jinwoodo and Sinjado, which seems to be attributable to channel migration. As a result of the EOF method, the first mode (48.7%) is most closely related to the pattern of morphological variability that might be associated with the westerly movement of sediment by longshore current. The spatial variability of the second mode (16.6%) was high in the shoreface of Sinjado, showing a 4-year periodicity of temporal variability. The strong correlation (coefficient 0.73) between the time coefficient and suspended sediment discharge from Nakdong River emphasizes the role of sediment discharge to deposition in this area. The spatial variability of the third mode (11.3%) was distributed mainly around the coast off the eastern part of Sinjado, which is related to the movement of the coastline of Sinjado. Based on the last 5 year's data, our results suggest that the study area is characterized on the whole by a depositional pattern, but the extent of sedimentation is different locally.

Seed Morphological Characteristics and Dormancy type of Eranthis stellata Maxim., Korea Rare Plant. (희귀식물 너도바람꽃(Eranthis stellata Maxim.) 종자의 형태특성 및 휴면유형 분석)

  • Inhwan Chae;Geon Hui Ryu;Se-kyu Song;Jin-Woo Kim;Gi Ho Kang;Hayan Lee
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2020.08a
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    • pp.20-20
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    • 2020
  • Eranthis stellata Maxim. is a perennial plant that grows around the valley. E. stellata is concerned about the decline in natural habitats due to climate change in KOREA, continues to be observed and protected as an endangered species (Least Concrned, LC). Nevertheless, studies on the characteristics of the seeds of E. stellata are insufficient. So, this study analyzed the morphological characteristics and dormancy types of seeds. Seeds of E. stellata was collected in April at Gyeongsangbuk-do Arboretum and kept at 5 ℃ until using. To investigate the morphology of seeds, an optical microscope and a scanning electron microscope (SEM) were used. GA3 treated or untreated seeds (4 replicates of 25 seeds each) were observed germination and embryo growth for 1 month at 5 ℃ and 25/15 ℃ (12h day/12h night). The seed surface of E. stellata, light brown, was observed as a common characteristic of Eranthis genus, reticulate. The short axis of seeds was 1.11~1.77mm (average 1.44mm), and the long axis was 1.27~1.91mm (average 1.63mm), which was investigated in a slightly round shape (subglose). While no germination was observed at all conditions, Embryo growth was observed at 5 ℃ both in the control group and with GA3treated groups. Thus, seeds of E. stellata are classified as morphological physiological dormancy (MDP), which requires embryonic development and dormant break at the same time. These results can be useful information for determining morphological physiological seed dormancy and germination, and will be an important basic data for seed propagation of E. stellata as a resource.

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Characteristics and Optical Properties of the Azobenzene Functionlized Dendrimer in Organic Thin Monolayers (아조벤젠이 기능화된 덴드리머 유기단분자막의 광학적 성질과 특성)

  • 손정호;윤회찬;김정명;김병상;신훈규;장정수;권영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.182-185
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    • 2001
  • The functionlized dendrimer containing 48 azobenzene was synthesized. Many isolated featureless domains were explicitly observed even at the air-water interface. Also, these monolayers were representatively observed, showing the change of surface pressure with irradiation time and wavelength. In AFM images. the larger domains irregularly shaped structures on the top while the smaller ones were free from such defects. In the optical absorption spectra of the LB films by UV irradiation and heat treatment, only photoisomerization of the G4-48Az monolayers was observed, a decrease of absorbance peak without change of the spectral shape. This suggests that optical behavior and morphological change are affected by the functional group and the symmetric chain.

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The Surface Property Change of the Heat Treated Dental Porcelain Alloy (열처리에 따른 치과도재용 합금의 표면특성에 관한 연구)

  • Nam, Sang-Yang;Kim, Chi-Young
    • Journal of Technologic Dentistry
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    • v.19 no.1
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    • pp.13-19
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    • 1997
  • The purpose of this study was carried out by oberserving to composition of an oxide on the surface of Dental porcelain alloy according to the conditions of its heat treatment and analysing the change composition on its surface. Morphological change of the heat treated dental porcelain alloy have been investigated with SEM and EDX. The result of this study is summarized ad follows. The surface indium concentration of specimens increased as the heat treatment temperature and the oxygen partial pressure increased.

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