• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.593-594
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• 2001

가무락조개, Cyclina sinensi(Gmelin)는 백합과에 속하는 식용 이매패로서 한국, 중국, 일본의 연안에 분포한다. 특히, 우리나라에서는 서ㆍ남해안 해역의 니질에 서식하며(Yoo, 1976), 지금까지 가무락조개에 관한 연구ㆍ조사는 일본 히로시마산 가무락조개의 초기발생(Haragaki, 1966)과 한국산 가무락조개의 인공산란유발ㆍ인공수정 및 성장(Choi, 1971; Choi and Song, 1973; Choi, 1975), 생식주기(Lee and Cho, 1985) 등이 정성분석으로 보고되어 있을 뿐 정량적 분석에 의한 정확한 산란기 등이 제대로 밝혀져 있지 않은 실정이다. (중략)

• (The) Research of the performance art and culture
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• no.33
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• pp.165-193
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• 2016

배구자는 1920~30년대 조선에서 큰 인기를 확보한 무용수이자 연극인이었다. 그녀는 배구자악극단을 창립하여 조선과 해외(일본)를 오가면서 공연을 펼쳤고, 대중들은 그녀의 작품을 보기 위해서 극장으로 몰려들었다. 그녀와 그녀의 극단이 인기를 확보하고 있을 무렵, 그러니까 1931년 배구자무용연구소는 '혁신 공연'을 선언하고 일련의 작품을 발표했다. 당시 공연 작품 중에는 가무극 <파계>가 포함되어 있었는데, 다행히 <파계>는 공연 대본으로 기록되어 현재까지 전해질 수 있었다. 남아 있는 가무극 <파계>를 통해, 배구자무용연구소(나아가서는 '배구자악극단')의 공연 전략과 레퍼토리의 실체를 파악할 수 있을 것으로 기대된다. 조선 근대연극(사)의 주요한 축을 담당한 배구자악극단에 대한 연구는, 일제강점기 조선의 대중극의 다양한 갈래와 그 특성에 대한 이해를 제고할 것으로 전망된다.

• The Korean Journal of Malacology
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• v.16 no.1_2
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• pp.35-41
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• 2000

We investigated the gonad index (GI), gonadal development, the reprodutive cycle and first sexual maturity of the venus clam, Cyclina sinensis by histological observation. Samples were collected from the intertidal zone of Komso Bay, Chollabuk-do, west coast of Korea, from April 1998 to March 1999. This clam is dioecious and oviparous. Monthly changes in the gonad index (GI) showed a similar pattern to the reproductive cycle. Ripe oocytes are about 90-100 ㎛ in diameter. The spawning period was between early July to September, and the main spawning occurred between July and August when the sea water temperature was over 20$\^{C}$ The reproductive cycle of this species can be divided into five successive stages: early active stage (February to April), late active stage (March to June), ripe stage (April to August), partially spawned stage (July to October), and spent / inactive stage (September to February). Percentages of first sexual maturity of female and male clams measuring 26.1-30.0 ㎜ in shell length were 53.3% and 62.5%, respectively, and 100% for the clams > 41.0 ㎜. It is assumed that both sexes begin reproduction at about two years age.

• Korean Journal of Environmental Agriculture
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• v.2 no.1
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• pp.24-29
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• 1983

The effects of temperature on the uptake of $^{137}Cs$ from seawater and on the retention after its uptake by the clam Cycling sinensis was investigated under laboratory conditions. The clams exhibited a greater bioaccumulation of $^{137}Cs$ in $25^{\circ}C$-acclimated animals than those acclimated at $15^{\circ}C$. The viscera of the clams reached the highest bioconcentration factor after 14 days uptake from seawater, but the tissue distribution pattern of $^{137}Cs$ was little influenced, if any, by the uptake temperature. The uptake rate slightly decreased with an increase of temperature in order of $10^{\circ}C$. The radionuclide accumulated in clams was released again in a radionuclide-free seawater according to a two-exponential compartment model. A temperature increase of $10^{\circ}C$ reduced the biological half-life of the long-lived component with a factor of about two, whereas it caused no change in the short-lived component.

• KOREAN POULTRY JOURNAL
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• v.38 no.1 s.435
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• pp.140-141
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• 2006

• Korean Journal of Fisheries and Aquatic Sciences
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• v.8 no.3
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• pp.185-195
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• 1975

The comparative studies Were conducted with respect to the artificial spawning early embryonic development, metamorphosis and growth of two species Meretrix lusoria and Cyclina sinensis collected from Inchon, Anmyon island and Buan areas from 1969 to 1974. The highest rate of artificial spawning of M. lusoria, which treated with a dilute ammoniun hydroxide(4/100-5/100N)-seawater solutions, was $25.0-33.3\%$, whereas in C. sinensis the rate of spawning was lower than that of M, lusoria under the similar experimental conditions$(12.5-19.0\%)$. However, the rate of artificial spawning of C. sinensis increased $40\%$ by repeated thermal stimulation. The rate of artificial fertilization of M. lusoria and C. sinensis showed highest value from those individuals which were treated with 1/1000N $NH_4OH$ solution. Their fertilized eggs, then, showed a normal development in the 1/1000N $NH_4OH$ solution. In the early embryonic development of M. lusoria and C. sinensis, the appearance of each of polar body, trochophore and D-shaped veliger were observed around 50min. 5-6 hours, and 23 hours after artificial fertilization respectively. The larval shell lengths of M. lusoria reached to $109,5{\pm}0.7\mu,\;144.6{\pm}1.3\mu$ and $208.0{\pm}0.0\mu$ around, 1, 11 and 20 days, after fertilization respectively. The larval shell lengths of C. sinensis reached to $110.5{\pm}0.6\mu,\;147.8{\pm}1.7\mu,\;and\;235.0{\pm}0.0\mu$ around 1, 10 ana 20 days, after fertilization respectively. The correlations of relative growth rate between the shell length(L) and sell height(H) found by the following simple formula from D-shaped veliger to metamorphosing stage. H=0.77L+6.82 for M. lusoria H=0.75L+8.50 for C. sinensis.

• Journal of Educational Research in Mathematics
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• v.18 no.4
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• pp.469-482
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• 2008

This study analysed difficult points on the understanding of infinity when the concept is considered as actual infinity or as potential infinity. And I consider examples that the concept of actual infinity is used in texts of elementary and middle school mathematics. For understanding of modem mathematics, the concept of actual infinity is required necessarily, and the intuition of potential infinity is an epistemological obstacle to get over. Even so, it might be an excessive requirement to make such epistemological rupture from the early school mathematics, since the concept of actual infinity is not intuitive, derives many paradoxes, and cannot offer any proper metaphor.

• Journal of Aquaculture
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• v.20 no.2
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• pp.75-80
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• 2007

Amino acid composition and relationship of the commercially valuable five Korean Veneridae, Protothaca jedoensis, Ruditapes philippinarum, Meretrix lusoria, Saxidomus purpuratus and Cyclina sinensis were compared. The major amino acids of five species in Veveridae clams were ureanine, taurine, proline, glycine, alanine and arginine. A similarity of amino acid between C. sinensis and M. lusoria was highest (0.94) and lowest (0.52) for between C. sinensis and P. jedoensis, respectively.

• Parasites, Hosts and Diseases
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• v.29 no.1
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• pp.87-92
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• 1991

In order to determine the vector species of tsutsugamushi disease in Korea chiggers were individually dissected, and internal contents were tested for Rickettsia tsutsugamushi organisms by means of indirect FA test, and each exoskeleton was mounted on slide for identification. Among 4,142 chiggers collected from 48 Apodemus agrarius at nine different localities during the period of July-November, 1989, 990 chiggers of 10 species of Trombiculidae were dissected and tested. Rickettsiae were confirmed in two Leptotrembidium pallidum larvae out of 447 tested, giving 0.4% of the infection rate. The chiggers of the other species tested were found negative.

• Journal of Korea Fishing Vessel Association
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• v.5
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• pp.79-82
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• 1980