• ALGAE
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• 제24권4호
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• pp.195-203
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• 2009

Most Skeletonema species have been identified under the name of S. costatum. To assess the morphological species diversity in the genus Skeletonema, we surveyed the nine localities in the coastal waters of South Korea. The light microscopy (LM) and scanning electron microscopy (SEM) observations in this study showed that ultrastructural features of genus Skeletonema discriminated among four species: S. dohrnii Sarno & Kooistra, S. marinoi Sarno & Zingone, S. subsalsum (Cleve) Bethge, and S. tropicum Cleve. In S. dohrnii, cell diameters were 3-6 ${\mu}m$ and the pervalvar axes were 13-19 ${\mu}m$. One or two partial chloroplasts were visible in a cell. Cells of S. marinoi were 4-10 ${\mu}m$ and the pervalvar axes were 8-18 ${\mu}m$. Each cell contained one chloroplast. Cells of S. subsalsum which contained 1-2 chloroplasts were 8-13 ${\mu}m$ and the pervalvar axes were 11-20 ${\mu}m$. Cells of S. tropicum were 10-18 ${\mu}m$ and the pervalvar axes were 4-9 ${\mu}m$. 2-4 chloroplasts were seen in each cell. Tip width of fultoportula in S. dohrnii and S. marioni was flared and flat, but that in S. subsalsum and S. tropicum was narrow. Morphological groups among them, S. dohrnii and S. marinoi were the most widely distributed in all seasons, while S. tropicum was only occurred in a summer season.

• 환경생물
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• 제38권1호
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• pp.21-29
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• 2020

Skeletonema pseudocostatum의 세포는 규산질 성분의 돌기에 의한 사슬 형태로, 길이는 6~17.3 ㎛였고, 엽록체는 세포 당 1~2개를 포함하고 있었다. 주사전자현미경 관찰결과 Skeletonema 종을 구분할 수 있는 가장자리 받침돌기끝(terminal fultoportula process)은 끝이 갈라지거나, 갈고리 모양이었고, 길이가 1.67±0.5 ㎛이고, 개각의 가장자리에 위치해 있으며, 개수는 8.10±1.1개로 개각의 크기에 따라 다양하게 나타났다. 말단세포 입술돌기(terminal rimoportula process)는 두꺼운 원통형의 나팔관 모양으로, 개각의 중앙 근처에 위치하였고, 길이는 1.1±0.6 ㎛였으며, 개수는 1개였다. 연결세포 받침돌기(intercalary fultoportula process)는 대부분 1 : 1 결합으로 서로 맞물려 있는 형태였고, 1 : 2 결합도 종종 발견되었다. 계통분석 결과는 형태적 특징이 유사한 종 간의 유전학적 거리가 가깝다는 것을 나타냈고, 지리적 기원이 다른 동일 종의 경우, 유전적 차이를 보이지 않았다. 이는 S. pseudocostatum은 지리적 위치와 상관없이 유전적 차이가 나타나지 않는 단일계통(monophyly)이라는 것을 의미한다.

• 한국임상수의학회지
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• 제7권2호
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• pp.489-495
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• 1990

The purpose of this study was to investigate the contamination rates of Keratinophilic fungi in soils In Chonju. From september to November 1986, 98 soil samples were collected at the school and children's play ground, dog barn, pig barn, cow barn, horse barn and fowl barn( total 33 sites ). The samples were collected at the different depths(0～2cm, 30cm, 50cm ) in each of the sites, respectively. Each sample was cultured at 25$^{\circ}C$ according to Modified hair baiting method by using horse mane hair as a bait. The results obtained were summerized as follows ; 1. Eighty one of the 98 soil samples were found to be positive for Keratinophilic fungi. 2. In the examination of keratinophilic fungi in 98 soil samples, the organisms isolated weie as follows; Microsporum gypseum 20, Trichophyton ajelloi 15, Chrysosporium tropicum 40, C. Keratinophilum 24, C. tuberculatum 6 and Chrysosporium spp. like organism 4 strains. 3. The positive rates of keratinophilic fungi in each of the depths were 87.9%(29/33) in surface layer, 90.9%(30/33) in middle layer and 68.8％(22/32) in deep layer. 4. The positive rates of Keratinophilic fungi in each of the sites were 100%(3/3) in horse barn 91.7％ (l1/12) in dog barn, 88.9%(16/18) in pig barn, 86.7%(13/15) in cow barn, 76.2%(16/21) in fowl barn and 75.9%(22/29) in school and children's play ground. 5. The isolation rates of M. gypseum, Pathogenic fungi for human and animals, were as follows ; 58.3％ in dog barn(surface layers 100％, middle layers 50％, deep layers 25％) and 16.7％ in pig barn(surface 33.3％, middle 16.7%, deep 0％). In the cow barn, the isolation rates were 13.3%(surface 40.0％, middle 0%, deep 0％) and 10% in horse barn(surface l00％, middle 100%, depp 100%). In the fowl barn, the isolation rates was 19.1%(surface 28.8%, middle 14.3%, deep 14.3%) and 3.5% in school and children's play ground(surface 0％, middle 0％, deep 11.1%).