• Journal of Korean Society of Forest Science
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• v.85 no.1
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• pp.76-83
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• 1996

Four natural Quercus stands in Kwangju, Kyonggi-Do, of which ages ranging from 32 to 38 years old, were studied to compare their growth, biomass and net production. Ten $10m{\times}10m$ quadrats were set up and ten sample trees were harvested for dimension analysis in each stand. The largest mean DBH and height were shown by Q. acutissima stand, and followed by Q. variabilis stand, Q. mongolica stand, and Q. dentata stand in descending order. Tree density was the highest at Q. variabilis stand, and followed by Q. dentata stand, Q. mongolica stand, and Q. acutissima stand in descending order. Biomass was the largest at Q. acutissima stand(122.73t/ha), and followed by Q. variabilis stand(87.03t/ha), Q. mongolica stand(72.14t/ha), and Q. dentata stand(38.56t/ha) in descending order. Net production was the greatest at Q. mongolica stand(7.49t/ha/yr.), and followed by Q. variabilis stand(6.47t/ha/yr.), Q. acutissima stand(6.06t/ha/yr.), and Q. dentata stand(3.52t/ha/yr.) in descending order. The highest net assimilation ratio was exhibited by Q. acutissima stand (3.275), and followed by Q. variabilis stand(2.898), Q. mongolica stand(2.888), and Q. dentata stand (1.840) in descending order. The difference in net assimilation ratio and net production among four stands was caused by differences in their leaf biomass. The difference in net production and biomass among four stands was due to that in the distribution of net production among stems, branches and leaves.

• Korean Journal of Pharmacognosy
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• v.20 no.2
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• pp.117-122
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• 1989

The effect of wild vegetables such as Allium tuberosum, Allium monanthum, Sedum sarmentosum, Ixeris dentata and Capsella-bursa pastoris on hexobarbital induced hypnosis was tested in mice. Among them, the methanol extract of Allium tuberosum exhibited significant lengthening of the barbiturate hypnosis. When various fractions prepared from the methanol extract of the Allium tuberosum were administered, the chloroform, ethylacetate and butanol extracts caused a significant activity. Through systematic fractionation by $SiO_2$ column monitoring by bioassays, $1,2,3,4-tetrahydro-{\beta}-carboline$ 3-carboxylic acid from the butanol extract was isolated as one of the active principles of this plant.

• Journal of Plant Biology
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• v.37 no.3
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• pp.343-347
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• 1994

In order to compare the adjustment of 6 oak species to water stress, the components of water status, tissue elastic modulus, free proline content of leaves and morphological characteristics were determined in pot culture. uercus dentata and . mongolica responded effectively to drought with high root : shoot (R/S) ratio or maintenance of high turgor pressure by large and fast osmotic adjustment and . variabilis with maintenance of high turgor pressure by low elastic modulus under drought. Meanwhile, . aliena and . serrata responded effectively with low omotic potential (Ψo) at full saturation and . acutissima with long root in spite of rigid cell wall and high osmotic potential (Ψo) at full saturation. Proline content in leaves of . dentata, . mongolica and . aliena increased early and rapidly at high leaf water potential (Ψleaf). The results indicate that 6 oak species have adjustment different from each other to water stress.

• Animal Systematics, Evolution and Diversity
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• v.6 no.2
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• pp.209-218
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• 1990

The gromiids (Protozoa ; Sacromastigophora ; Rhizopoda) collected at 9 different sites in Korea , during the period from May to October 1989 were examined, and four species were identified with the scanning electron microscope(SEM). Three species : Euglypha acanthophora. Tracheleuglypha dentata and Trinema enchelys turned out to be new to the Korean fauna.

• Archives of Pharmacal Research
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• v.13 no.3
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• pp.269-273
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• 1990

Blood glucose and total lipid levels in rats with streptozotocin-induced diabetes were determined after intraperitoneal administration of methanolic extract of Ixeris dentat whole plants and its main component, cynaroside (=luteolin 7-O--$\beta$-D-glucoside). From the data obtained, it was concluded that intraperitoneal administration of the methanolic extract produced a significant hypoglycemic effect. Total blood lipids were also decreased. Cynaroside in the streptozotocin-diabetic rats failed to exhibit hypoglycemic effect but a significant hypolipemic activity was observed. Thus, it is suggested that this methanolic extract may contain one or more hypoglycemic and hypolipemic principles including the main flavone glucoside, cynaroside, which can significantly reduce the levels triglyceride and total cholesterol in streptozotocin-diabetic rats.

• The Korean Journal of Mycology
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• v.48 no.4
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• pp.505-510
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• 2020

The fruiting bodies and roots of a Tuber species were collected from the rhizosphere of Quercus dentata in Pohang, Korea. The morphological characteristics of the ascoma and ectomycorrhizal roots were studied, and phylogenetic analyses were performed using the sequences of the internal transcribed spacer, large subunit rDNA, and β-tubulin DNA. Based on the features of the fruiting bodies, the species was identified to be Tuber huidongense, which has not been reported earlier in Korea. The morphological characteristics and phylogenetic analysis of T. huidongense are described in the present study.

• Mycobiology
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• v.50 no.2
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• pp.104-109
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• 2022

Fungi of the genus Tuber are ectomycorrhizal fungi that form a symbiotic relationship mainly with oak and hazel trees. Tuber spp. exhibit a highly selective host plant preference; thus, for cultivation purposes it is important to select an appropriate host plant for successful mycorrhization. In addition, as mycorrhizal characteristics differ according to Tuber spp., it is necessary to understand the differences in mycorrhizae according to the fungal species. Tuber huidongense and Tuber himalayense were recently discovered in Korea; therefore, we used spore suspensions from these two species to inoculate two species of oak trees, Quercus acutissima and Quercus dentata, to compare colonization rates and morphologies of the mycorrhizae. The colonization rates demonstrated that the different Tuber spp. favored different host plant species. In addition, unique morphological and anatomical characteristics were observed for T. huidongense and T. himalayense depending on the host species. These findings can lead to new economically important agricultural activities related to truffle cultivation in Korea.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.526-526
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• 2003

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.1
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• pp.123-129
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• 1997

The effects of Aster scaber(Cham chyi) and Ixeris dentata(Sumbagui) of composite were studied on lipid metabolism in rats. Thirty rats were divided into five groups and fed diets containing 1% cholesterol, 0.25% sodium cholate, 10% coconut oil and 5% lard(control group) for 4 weeks. For each experimental diet added was 5% plant powder or extract of the plant which was equivalent to 5% Plant powder by dry weight. The lipid components of serum were assayed. The concentration of the total cholesterol was significantly lower in Cham chyi, and Sumbagui powder and the extract groups of those powder than the control group. The concentration of HDL-cholesterol was significantly higher in rats fed Cham chyi and Sumbagui powder than the control group. The concentration of LDL, LDL-cholestrol, VLDL and chylomicron were comparatively lower in Cham chyi and Sumbagui powder groups than those in the control group. The concentration of seum triglyceride was lower in Cham chyi powder fed group than the control group.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.04a
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• pp.303-307
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• 2008

In this study, we have carried out the cone calorimeter test to examine the thermal characteristics, such as total smoke production(TSP), smoke temperature and oxygen consumption, of significant parts of above trees which are representative species of Young Dong Province of Korea. The smoke production of dead leaves and living leaves of pinus densiflora was increased rapidly at the early period of combustion. So the total smoke production of this parts was 8.3 times higher than other parts. The TSP of branches and barks of quercus dentata was 14.4 and 7.2 times higher than of pinus densiflora respectively. And also the maximum smoke temperature was about $338.35{\sim}353.25\;K$. The significant difference of oxygen consumption was not detected for dead leaves, branches and barks. However, the oxygen consumption of living leaves which have high percentage of moisture content is the lowest.