• Title, Summary, Keyword: Morphological characteristics

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Phenetic Variability in Leaf Morphological Characteristics of the Korean Rubus crataegifolius Populations (한국 산딸기 집단에서 잎 형태 특성에 나타난 표현형 변이)

  • Cho, Min-Cheol;Huh, Man-Kyu;Kim, Sea-Hyun;Cho, Kye-Joong;Kang, Chang-Wan
    • Journal of Life Science
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    • v.19 no.10
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    • pp.1382-1388
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    • 2009
  • Rubus crataegifolius is a shrub species and is primarily distributed throughout Asia and Europe. We collected 550 representative samples of the eleven populations in Korea to estimate leaf variation within species. The 35 morphological characteristics allowed us to resolve well-supported fixed characteristics and variable characteristics. Sixteen of twenty-three quantitative characteristics and five of twelve qualitative characteristics showed significant differences among populations. We argued that the population differentiation can accounted for the variation in phenetic characteristics such as spine in this species, but were less successful in accounting for variation in other traits. Within a polystatistic leaf structure, their morphological differences could be modulated by ecological pressure such as temperature, altitude, duration of sunshine, and solar radiation. The phenogram showed two distinct clades. One was a group in central Korea and the other was a group in the southern regions of Korea. If morphological characteristics in R. crataegifolius populations reflect their ecological niche, morphology should be regarded with caution as the main criterion for population studies in R. crataegifolius.

A study on stream morphological characteristics according to effect of Map Scale (지도축척의 영향에 따른 하천형태학적 특성연구)

  • 안상진;조용진
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.23 no.1
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    • pp.64-74
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    • 1981
  • The stream morphological characteristics of watershed have important influence upon the analysis of runoff. In this study, the effect of the map scale on the stream morphological characteristics was used on the data taken from 15'(1:50, 000) and 7'30"(1 :25,000) topographic maps which could cover the whole Miho River basin This basin are the first tributary of the Geum. River. Otherwise, the longitudinal stream bed profile was calculated by Yang's theoretical stream bed profile, equilibrium profile and actual profile. In the result of this investigation the conclusion is that the resultant relationship obtained from different topographic maps in the scale on the same stream system has come upon the same result as the stream morphological characteristics. Therefore, the great amount of time and effort can be saved in studing the stream morphological charecteristics by using the 15' instead of the 7'30"map system excluding the first order streams.

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Morphological Characterization and Classification of Anuran Tadpoles in Korea

  • Park, Dae-Sik;Cheong, Seo-Kwan;Sung, Ha-Cheol
    • Journal of Ecology and Environment
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    • v.29 no.5
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    • pp.425-432
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    • 2006
  • The tadpoles of 12 Korean anuran species, including Bombina orientalis, Bufo gargarizans, B. stejnegeri, Hyla japonica, Kaloula borealis, Rana dybowskii, R. huanrenensis, R. coreana, R. nigromaculata, R. chosenica, R. rugosa, and R. catesbeiana, were classified based on their morphological characteristics. We collected eggs or tadpoles of the 12 Korean anuran species from Gangwon, Incheon, Chungcheong, and Gyeonggi districts in 2005 and 2006 breeding seasons. When the tadpoles reached at $27{\sim}37$ Gosner's developmental stages, we described morphological characteristics of the tadpoles of each anuran species and measured their physical parameters such as total length, body length, and body mass. After that, we chose 12 morphological characteristics to identify each species and to use them as classification keys such as eye location, caudal musculature pattern, spiracle location, oral disc morphology, and labial tooth row formula. In this paper, we presented classification keys, morphological characteristics, and drawings for the tadpoles of 12 anuran species.

Study of Boil Characteristics on Productivity of Flue- cured Tobacco (Nicotiana tabacum L.) III. Influence of Morphological Characteristics of Soils on Productivity of Flue-cured Tobacco (황색종 담배의 생산성에 관여하는 토양특성 제3보. 토양의 형태적 특성이 황색종 담배의 생산성에 미치는 영향)

  • 김용연
    • Journal of the Korean Society of Tobacco Science
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    • v.9 no.2
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    • pp.49-57
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    • 1987
  • This study had been conducted to determine morphological characteristics of soil in the major districts cultivating flue-cured tobacco plant. Also native soil productivities were measured by means of bioassay planting tobacco plant without fertilizer at 87 selected soils through field experiment. Morphological characteristics of troll affecting the dry weight of tobacco leaves cultivated in the field were investigated Among soil morphological characteristics, topograpy, slope, topsoil depth, soil depth, and soil texture had influenced with high significant on the dry weight of tobacco leaves. For prediction of dry weight (productivity) of tobacco leaves without fertilizer , multiple regression analysis were introduced using soul morphological characteristics. A combination of topography, slope, topsoil depth, and soil texture was very reliable for prediction of productivity. The regression equation was y = -16.88 -14, 34$X_1$ +20.43$X_2$ +50.21$X_3$ -7.54$X_4$ +13.45$X_5$ R = $0.670^{**}$ Where $X_1$ : Topography $X_2$ : Slope $X_3$ : Topsoil Depth $X_4$ : Soil Depth $X_5$ : Soil Texture

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Morphological Characteristics of Siberian Flying Squirrel (Pteromys volans): Sexual Dimorphism and Camparison of Morphological Characteristics in Different Latitudes (하늘다람쥐(Pteromys volans)의 형태적 특성: 성적이형성 및 위도에 따른 형태학적 특성 비교)

  • Kim, Junsoo;Jeon, Jonghoon;Lee, Woo-Shin;Kim, Jong-U
    • Journal of Korean Society of Forest Science
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    • v.108 no.1
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    • pp.133-137
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    • 2019
  • This study was conducted to clarify the morphological characteristics of Siberian flying squirrel (Pteromys volans). We investigated 6 morphological characteristics from April, 2014 to March 2016 at Mt. Baekwoon, Wonju, Gangwon province. We found that Siberian flying squirrel showed female-biased sexual dimorphism. This result would be related to reproductive strategy of the species which female nurse offspring alone. As results of comparison of morphological characteristics from Korea, Finland and Japan, both body weight and head-body length appeared heavier and longer from high-latitude to low-latitude. This result suggest that morphological difference between different latitudes would be related with climate and habitat environment. The more researches would be needed with other morphological characteristics of Siberian flying squirrel.

Influence of Host Age on Development and Morphological Parameters of the Parasitoid Nesolynx thymus Girault (Hymenoptera: Eulophidae), An Ecto-Pupal Parasitoid of the Uzi Fly, Exorista bombycis (Louis) (Diptera: Tachinidae)

  • Aruna A.S.;Manjunath D.
    • International Journal of Industrial Entomology
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    • v.12 no.1
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    • pp.45-49
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    • 2006
  • The present investigation was conducted to know the effects of host age on development and morphological characteristics of Nesolynx thymus, a gregarious ectopupal parasitoid of the uzi fly, Exorista bombycis, a serious en do-larval parasitoid of the silkworm, Bombyx mori L. For experimentation, 3 - 11 day-old pupae of E. bombycis were exposed to 2 day-old adults of N. thymus at $25{\pm}2^{\circ}C\;and\;60{\pm}10%$ RH. A highly significant negative correlation between host age and the following development and morphological characteristics of the parasitoid was observed: number of pupae parasitised, total adult recovery, sex ratio and recovery, longevity, body length, wing span, abdomen length, and abdomen width of females. The findings of the present study clearly demonstrate that various development and morphological parameters of N. thymus are influenced by the age of E. bombycis pupae.

Discrimination of Aralia continentalis Root by the Random Amplified Polymorphic DNA Analysis and Morphological Characteristics (RAPD 분석과 내부형태에 의한 독활(獨活)(Aralia continentalis)의 감별에 관한 연구)

  • Lee, Mi-Young;Ju, Young-Seung;Kim, Hong-Jun;Ko, Byoung-Seob
    • Korean Journal of Oriental Medicine
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    • v.7 no.1
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    • pp.145-152
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    • 2001
  • Dried parts of the herb medicines are difficult to distinguish morphologically. Heracleum moellendorffii cordata has often been sold instead of Aralia cordata in herbal medicine markets. Therefore, this study was conducted to develop the key for discrimination between them using the RAPD analysis and morphological characteristics. Thirty decarmer oligonucleotide primers were screened for the RAPD analysis, and four primers generated distinct RAPD markers specific to Aralia cordata, Angelica pubescens maxim f. biserrata, and Heracleum moellendorffii. The specific RAPD patterns generated by the selected primers were reproducible from dried materials. In comparison of morphological characteristics, Aralia cordata seems to be entirely developed in xylem fiber, but not developed in pith.

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A Study of Osteoporosis Prediction using Morphological Measuring of Proximal Femoral Part and Trabecular Characteristics Based on Femoral Radiographic Image (대퇴부 방사선영상에서 대퇴골 근위부의 형태학적 측정과 골소주의 특성을 이용한 골다공증 예측에 관한 연구)

  • Kim, Sung-Min;Roh, Seung-Gyu;Ro, Yong-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.4
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    • pp.823-830
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    • 2010
  • This study was designed to examine the morphological measurement and characteristics of trabecullae based on femoral radiographic image for prediction of osteoporosis. Study subjects were 34 females (average age of 62.1 years) and 6 males (average age of 60.1 years), they were categorized into normal group and osteoporosis group in accordance with the T-score value. Measurement of the bone density of femoral bone was measured with DEXA(Dual Energy X-ray absorptiometry). ROI(Region of interests) was selected on femoral neck and trochanter. Characteristics of trabecullae was analyzed by using the skeletonization analysis of trabecular image. Morphological measurement was analyzed through femoral radiographic image in order to examine the correlation with osteoporosis. The result demonstrated statistically significant correlation between neck cortical thickness, shaft width, shaft cortical thickness, periphery, mean gray level and trabeculae area with BMD average (T-score) of femoral part. The results show that morphological measurement and characteristics of trabecullae based on femoral radiographic images for osteoporosis prediction could be effective.

Variation and Correlation of Shearing Force with Feed Nutritional Characteristics of Wheat Straw

  • Cui, X.M.;Yang, Z.B.;Yang, W.R.;Jiang, S.Z.;Zhang, G.G.;Liu, L.;Wu, B.R.;Wang, Z.F.
    • Asian-Australasian Journal of Animal Sciences
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    • v.26 no.10
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    • pp.1466-1473
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    • 2013
  • This experiment was conducted to study the variation laws and correlations of shearing force and feed characteristics including morphological characteristic, chemical composition and in situ degradability of wheat straw. Feasibility of evaluating the nutritional value of wheat straws with shearing force values was analyzed in this study. Six hundred wheat straw plants (Jimai 22) were randomly selected and placed in a cool and ventilated place. Samples were collected in the 1st, 15th, 30th, 45th, 60th d after harvest to measure shearing force, morphological characteristic, nutritional composition. Rumen degradation of dry matter (DM), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of wheat straws were determined by the nylon bags method. The results demonstrated that linear and quadratic effects of storage time on all the tested morphological characteristics were significantly correlative (p<0.01). As storage time goes on, all the tested nutrients and their rumen degradations of wheat straw was linearly (p<0.01) and quadratic (p<0.01) correlative except ADF content and rumen degradation of ADF. Significant correlations were determined in linear effect of shearing force on morphological characteristics (p<0.01), and linear density and diameter were a more sensitive predictor than stem thickness for shearing force. There were strong correlations between storage time and all the measured physical characteristics (shearing force, morphological characteristics and shearing force standardized by morphological characteristics) (p<0.01). Nutrition compositions were linearly correlative with shearing force and standardized shearing force (p<0.01). The linear correlation between rumen degradation of DM and NDF and shearing force and standardized shearing force were evident (p<0.01). In conclusion, shearing force, nutrition compositions and their rumen degradation of wheat straw were still dynamic with storage time after harvest. Correlation could be found between shearing force and nutritional characteristics of wheat straw. Nutrient content, morphological index and rumen degradation of DM and NDF could be predicted by changes in shearing force. Shearing force should be applied according to a standardized storage time when it is used to forecast the feed value of wheat straws.

Morphological Characteristics and Classification of Zizyphus Cultivars in Korea by Multivariative Analysis (다변량 분석에 의한 국내산 대추나무 품종의 형태적 특성과 유연관계)

  • Lee Moon-Ho;Hwang Suk-In;Jang Yong-Seok
    • Korean Journal of Plant Resources
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    • v.19 no.1
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    • pp.105-111
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    • 2006
  • The objectives of this study, an analysis of fruit and leaf morphological characteristics among the five Zizyphus cultivars could be used for the investigation of cultivars classification and could provide information to make out the UPOV TG(Test Guidelines). ANOVA tests showed that there were statistically significant differences in all fruit and leaf morphological characteristics among the five Zizyphus cultivars at 1% level. But, for kernel characteristics, differences were statistically non-significant among the cultivars. Approximately, the Wolchul and Boeun cultivars showed larger and smaller values in overall characteristics and cultivars, respectively. The results of principal component analysis(PCA) for the fruit and leaf morphological characteristics showed that the first for principal components(PC's) explained about 65.3% of the total variation. The first PC was correlated with those characteristics that were mainly related to the terminal leaf length(TLL), leaf length(LL), fruit length(FL), terminal leaf width(TLW), and leaf petiole length(LPL). The second and third PC was mainly correlated with the terminal leaf morphological index(TLMI). Therefore, these characteristics were important to analysis of the fruit and leaf morphological characteristics and classification among the five Zizyphus cultivars. Cluster analysis using UPGMA method based on principal components showed that five Zizyphus cultivars could be clustered into two groups. Group I comprises Mudung, Wolchul, and Bokjo and Geumsung cultivars, Group II is Boeun cultivar. These results well similar to that of principal component analysis.