• 식물병연구
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• 제10권4호
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• pp.279-284
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• 2004

경상남도 진주와 하동지역의 산초나무 재배단지에서 잎녹병에 의한 피해가 매년 지속적으로 발생하고 있다. 산초나무 잎에 형성된 여름포자세대의 녹포자세대 기주를 밝히고 녹병균을 동정하기 위하여 본 병해의 발생지 주변 곰솔에서 채집된 녹포자를 산초나무에 인공접종하였다. 그 결과 산초나무에서 성공적으로 여름포자가 형성되어 이 녹병균은 녹포자세대를 곰솔에서, 여름포자 및 겨울포자세대를 산초나무에서 형성하는 장세대형 생활사를 갖는 C. xanthoxyli로 동정하였다. 대부분의 형태적 형질은 기존 기록과 일치하였으나 녹포자와 여름포자의 표면돌기 수에는 차이가 있었다. 곰솔과 산초나무에서 채집된 C. xanthoxyli의 건조표본을 이용하여 녹포자세대 및 여름포자세대의 형태학적 특징을 기술하였다. 경남 진주와 하동지역에서 조사된 산초나무에서의 최초 병발생시기는 6월 하순${\sim}$7월 초순이었으며 8월 중의 이병엽율은 17.8%${\sim}$58.7%이었다.

• The Plant Pathology Journal
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• 제17권5호
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• pp.257-263
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• 2001

Species of the genus Orobanche are parasitic flowering plants, holoparasites, which cling to the roots of green plants. Their tiny seeds (200 x $250\mu\textrm{m}$) germinate in response to chemical stimuli produced by host and some non-host plants. Successful contact with their host leads to development of haustoria for obtaining water and food. The shoots above the ground expose flowers and disseminate seeds. Several samples of Orobanche ramosa, O. crenata, O. cernua, and O. egyptiaca were collected from different localities in Jordan. These samples showed one of the following disease symptoms: dry rot at the base of the stem; general deterioration and expanded lesion from base upward; soft tissue maceration of stem; and black rot of flower parts with incomplete maturation of the ovary and seeds. Isolation from diseased stems and seeds was made on three different mycological media. Several fungi were isolated, mainly, Fusarium spp., Alternaria alternata, Rhizoctonia sp., Dendrophora sp., Chaetomium sp., and an ascomycetus fungus with a perithecium. Pathogenicity tests showed that Fusarium spp. and Alternaria alternata attacked healthy living tissue of Orobanche spikes. These fungi caused lesions of black soft rot and complete deterioration within 5-7 days. They also attacked Orobanche seeds, arresting their germination and causing maceration of non-germinated and germinated seeds after 5-7 days of incubation. Meanwhile, Dendrophora sp. and Chaetomium sp. caused limited lesion at first, but were able to colonize the tissue as it aged and senesced. This study showed the presence of a potential endogenous pathogenic fungi in Jordan, which can be investigated as a biological control for Orobanche.

• 한국환경복원기술학회지
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• 제23권2호
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• pp.1-16
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• 2020

The current status of geographical distribution range of Deutzia paniculata, one of the korean endemic plants, was investigated based on the species distribution information. The information of the geographical range used for analysis includes all the published references to the distribution of D. paniculata, herbarium specimens in Korea National Arboretum (KH) including its online database: http://www.nature.go.kr, and field research. Although, D. paniculata was firstly recorded in Wonsan, Hamgyeongnam-do, North Korea, this research revelaved that D. paniculata is mainly distributed in Gyeongsangbuk-do and Gyeongsangnam-do, southern regions of the Korean Peninsula. According to the distribution map, this species was estimated on distribution edge of in Anyang region of Gyeonggi-do, Mt. Naejang of Jeollabuk-do and Mt. Taebaek of Gwangwon-do on the distribution edge. However, it was made use of intensive field survey to identify the natural population of the species in these regions. D. paniculata habitat was mainly distributed between 290 meters and 491 meters in altitude, but it was also found ranged from 936 to 959 meters in Gun-wi, Gyeongsangbuk-do, South Korea. The distribution slope was 5° to 35° and the north, N, NE and NW in the aspect. The flora of vascular plants in D. paniculata habitats was listed in 137 taxa: 54 families, 103 genera, 120 species, 2 subspecies, 12 varieties and 3 forms while Korean endemic plants were found in three taxa, Stewartia koreana, Weigela subsessilis and D. Paniculata. Based on a collection of non-biological environment and biological environment data, D. paniculata population were discussed to make strategy and basic research methods for sustainable preservation.

• 한국균학회지
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• 제20권3호
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• pp.204-215
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• 1992

우리나라 4개 도(경기, 충북, 경북, 전북)의 9개 지역에서 19종의 콩과식물 주변으로부터 65곳 토양 표본을 채취, 내생균근균을 분리동정하여 생태학적 분석을 하였다. 그 결과 4속 21종이 발견되었고, Glomus속이 47.6%로서 출현빈도가 가장 높았고 Gigaspora속은4.8%로서 다른 속에 비해 빈도가 아주 낮았다. 콩과식물 주변 토양에서 가장 보편적으로 발견되는 내생균근균의 종은 Acaulospora laeuis와 Glomus laminated spores cf. macrocarpus var. macrocarpus.였다. 19종 콩과식물 중 Cassia mimosoides var. nomame와 Kummerowia striata의 두 식물 주변토양에서 내생균근균의 종수가 가장 많이 관찰되었다. 분리된 내생균근균의 포자수는 토양(건조하지 않은 토양임) 10g당 $0.3{\sin}10$개로 나타났다. 생태적으로 교란된 지역과 자연생태의 식생에서 채집한 콩과식물 주변토양의 내생균근균의 종 다양성을 비교한 결과 교란된 지역이 높은 것으로 나타났다.

• 한국잠사곤충학회지
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• 제51권2호
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• pp.201-206
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• 2013

멸종위기종인 남한산 상제나비의 28년 된 장기 건조표본을 이용하여 DNA 바코드 염기 서열을 최초로 분석하고, 이를 유라시아 10 지역 개체군 36개체들과 COI 특성을 비교해 보았다. 이들 개체군에서 총 5개의 haplotype을 확인하였고, haplotype I은 75%로 가장 높은 빈도를 나타내었으며, 유라시아 전 지역에 광범위하게 분포하고 있음을 확인하였다. 남한산 개체들은 모두 haplotype I에 속하고 있어 COI 유전자 상에서는 지역 고립성이 없는 것으로 밝혀졌다. 이 결과로 추후 남한산 상제나비 보전 및 복원은 타 지역 개체군 중 동일 haplotype 선별이 필수 요건으로 판단되나, 좀 더 정교한 평가를 위해서는 추가적인 마커를 이용한 분석이 필요할 것으로 제안한다.

• Parasites, Hosts and Diseases
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• 제51권5호
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• pp.537-544
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• 2013

The present study was performed to observe histopathological changes in tissues of Bithynia siamensis goniomphalos (Gastropoda, Bithyniidae) incubated in crude extract solutions of camellia (Camellia oleifera) seed and mangosteen (Garcinia mangostana) pericarp, and furthermore to estimate the molluscicidal effects of 2 plant substances. Substantial numbers of bithyniid snails were incubated in various concentrations of 2 plant solution for 24 hr. As the positive control, snails incubated in various concentrations of niclosamide, a chemical molluscicide, were used. The histopathological findings were observed in sectioned snail specimens of each experimental and control groups. The results showed that both camellia and mangosteen extracts had molluscicidal effects at 24 hr with 50% lethal concentration ($LC_{50}$) at concentrations of 0.003 and 0.002 g/ml, respectively, while niclosamide had $LC_{50}$ at concentrations 0.599 ppm. B. siamensis goniomphalos snail tissues (foot, gill, and digestive system) showed disruption of columnar muscle fibers of the foot, reduction of the length and number of gill cilia, numerous mucous vacuoles, and irregularly shaped of epithelial cells. Irregular apical and calciferous cells, dilatation of the digestive gland tubule, and large hemolymphatic spaces, and irregular apical surfaces, detachment of cilia, and enlargement of lysosomal vacuoles of epidermis were also shown in all groups. By the present study, it is confirmed that 2 plants, camellia and mangosteen, are keeping some substance having molluscicidal effects, and histopathological findings obtained in this study will provide some clues in further studies on their action mechanisms to use them as natural molluscicides.

• 식물분류학회지
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• 제46권3호
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• pp.295-300
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• 2016

제주도 서귀포시 일대에서 미기록 귀화식물 연등심붓꽃 (Sisyrinchium micranthum Cav.)이 발견되었다. 이 종은 중남미가 원산이며 여러 나라에서 침입종으로 보고된 바 있다. 연등심붓꽃은 국내에 먼저 보고된 귀화식물인 등심붓꽃의 자매종이며 두 종 모두 Echthronema 아속에 속한다. 연등심붓꽃은 화관의 밑부분이 긴 항아리 모양, 열매와 씨가 큰 점에 의해 등심붓꽃과 구별된다. 꽃이 연보라색이어서 국명을 연등심붓 꽃이라고 신칭하였다. 등심붓꽃의 이전 학명인 S. angustifolium Mill.은 Sisyrinchium 아속에 속하는 종이며 형태적으로 등심붓꽃 (S. rosulatum)과 매우 상이하다. 등심붓꽃의 학명을 기준표본, 원기재문, 최근의 논문들을 근거로 S. angustifolium Mill. 에서 S. rosulatum E. P. Bicknell 으로 변경한다.

• 식물분류학회지
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• 제43권3호
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• pp.196-207
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• 2013

전 세계 Juncus (골풀속)의 속내 분류체계는 최근 Kirschner에 의해 2아속 10절로 정리된 바 있으며, 두 아속은 소포의 유무와 화서에 의해 구분되며, 각각의 절은 잎의 특징, 화서의 위치, 수술, 종자의 형질 등에 따라 구분된다. 현재까지 한국산 Juncus 분류군들을 구분하는 형질들에 대한 종합적 검토는 미흡한 상태이다. 그러므로 본 연구는 지금까지 한반도에 자생한다고 보고된 분류군들 중 채집 및 표본조사가 가능한 14개의 Juncus 분류군들에 대하여 국내 11개 표본관으로부터 약 950점의 표본을 대여하여 조사하였고, 이들에 대한 지하경, 잎, 화서, 꽃, 과실, 종자 등의 외부형태학적 형질들에 대한 형질상태의 유형을 파악하여 도해하고, 분류군들 간의 구분성을 검토하였다. 이를 바탕으로 주요 식별 형질들을 이용한 검색표를 제시하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.31-36
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• 2000

High temperature and pressure materials in power plant are degraded by creep damage, if they are exposed to constant loads for long times, which occurs in the load bearing structures of pressurized components operating at elevated temperatures. Many conventional measurement techniques such as replica method, electric resistance method, and hardness test method for measuring creep damage have been used. So far, the replica method is mainly used for the Inspection of High temperature and pressure components. This technique is, however, restricted to applications at the surface of the testpieces and cannot be used to material inside. In this paper, ultrasonic evaluation for the detection of creep damage in the form of cavaties on grain boundaries or integranular microcracks are carried out. And the absolute measuring method of quantitative ultrasonic velocity technique for Cr-Mo material degradation is analyzed. As a result of ultrasonic tests for crept specimens, we find that the sound velocity is decreased as the increase of creep life fraction$({\Phi}_c)$ and also, confirmed that hardness is decreased as the increase of creep life fraction$({\Phi}_c)$ but the coefficient of ultrasonic attenuation is increased as the increase of creep life fraction$({\Phi}_c)$. Finally based on the result in this paper, it can be recognized that the ultrasonic techniques using velocities and attenuation coefficient factor are very useful non-destructive methods to evaluate the degree of material degradation in fossile power plants.

• Parasites, Hosts and Diseases
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• 제52권1호
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• pp.57-62
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• 2014

Biting midges (Culicoides: Ceratopogonidae) were collected by Mosquito Magnet$^{(R)}$ traps at the Neutral Nations Supervisory Commission (NNSC) camp and Daeseongdong village inside the demilitarized zone (DMZ) and near the military demarcation line (MDL) separating North and South Korea and at Warrior Base (US Army training site) and Tongilchon 3 km south of the DMZ in northern Gyeonggi Province, Republic of Korea (ROK), from May-October 2010-2012, to determine their seasonal distributions. A total of 18,647 Culicoides females (18,399; 98.7%) and males (248; 1.3%) comprising 16 species were collected. Overall, the most commonly collected species was Culicoides nipponensis (42.9%), followed by C. erairai (29.2%), C. punctatus (20.3%), C. arakawae (3.3%), C. pallidulus (1.8%), and C. circumscriptus (1.4%), while the remaining 10 species accounted for only 1.1% of all Culicoides spp. collected. The seasonal distribution of C. nipponensis was bimodal, with high numbers collected during May-June and again during September. C. erairai was more frequently collected during June-July, followed by sharply decreased populations from August-October. C. punctatus was collected in low numbers from May-September with high numbers collected during October. C. erairai was predominantly collected from the NNSC camp (85.1% of all C. erairai collected) located adjacent to the MDL at Panmunjeom in the northernmost part of Gyeonggi-do (Province), while other sites yielded low numbers of specimens.