• Title/Summary/Keyword: 열대류

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Amblyomma testudinarium Koch, 1844: Discovery and Record in Korea, and Identification and Redescription of Male Tick (Amblyomma testudinarium 진드기의 국내발견기록(國內發見記錄), 종속동정(種屬同定) 및 웅충(雄蟲)에 대한 형태학적(形態學的) 재기술(再記述))

  • Kang, Yung-Bai;Suh, Myung-Deuk;Kim, Yong-Hee;Byun, Si-Yul;Lim, Hi-Ung
    • Korean Journal of Veterinary Research
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    • v.21 no.2
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    • pp.65-72
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    • 1981
  • Amblyomma testudinarium Koch', 1844, previousely known to occur in India, Sri Lanka, Burma, Thailand, Malaysia, Indonesia, Indochina, the Philipines, Taiwan and Japan, is here firstly discovered and recorded in Korea. A male specimen was collected from grazing Frisian cattle of the Dae Weon Farm on Jeju Island by a local veterinary official on the 28th June in 1981. The specimen was examined at the institute of Veterinary Research in Anyang and was identified as A. testudinarium. The morphological characteristics of the male specimen were redescribed. A tota1 of 18 species of ticks belonging to 7 genera, such as, Argas, Amblyomma, Boophilus, Dermaccntor, Haemaphysalis, Hyalomma and Ixodes, has now been recorded to occur in Korea.

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Analysis of Research Trend on Zoysiagrass (Zoysia spp.) (한국 잔디류의 연구동향 분석)

  • Hyun, Yun-Hea;Choi, Byeong-Jin;Kim, Yoon-Joong;Joo, Young-Kyoo
    • Asian Journal of Turfgrass Science
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    • v.26 no.2
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    • pp.89-95
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    • 2012
  • Korean lawn grass, which belongs to Zoysia genus in Gramineae family, is one of the major turfgrass which is widely adapted to its native niches in the temperate region of the north east Asia through tropical regions including Philippine, Thailand and Australia. The Turfgrass Information Center' database provides 5,340 descriptive records including 638 referred papers and 1,370 technical reports concerning 'Zoysia'. The database focused on researches on golf courses and lawn care industries. The researches provide informations on seed technology and use of plant protectant for pest management in turf management industries. The purpose of this study is to analyze and classify the research contents of zoysiagrasses which have been published in Korean journals. The total number of research papers published in Korean journals were 274 including 102, 38, and 134 in the 'Botanical', 'Environmental' and 'Cultural' researches, respectively. Publication in foreign journals by Korean investigators were not counted in this research. Research fields concerning golf course maintenance and plant protectant are believed to be necessary when compared to international trends. Moreover, advanced research efforts for the development of new cultivars with various environmental and disease resistance should be accomplished.

Intestinal parasite infections among inhabitants in two islands of Tongyeong-gun, Kyeongsangnam-do (경남 통영군 2개 도서 지역 주민의 장내 기생충 감염 상황)

  • 홍성종;우호춘
    • Parasites, Hosts and Diseases
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    • v.28 no.1
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    • pp.63-67
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    • 1990
  • This study was performed to evaluate the status of intestinal parasitic infections among the inhabitants in two islands (Chu-do and Doomi-do) of Tongyeong.gun, Kyeongsangnam-do (Province), from August to September, 1989. A total of 189 stool specimens was collected from the inhabitants of 3 villages and examined by Kato's cellophane thick smear and formalin.ether sedimentation techniques. Stoll's dilution egg counting technique was done for the quantitative examination of helminth eggs. The overall Positive rate of intestinal Parasites was 30.2%. The egg Positive rate of Ascaris lumbricoides was 2.1%, that of Trichuris trichiura 24.3%, hookworm 2.1%, Trichostrongylus orientazis 0.5%, Czonorchis sinensis 1.1%, heterophyid 1.6%, and Taenia species 2.6%. The cyst positive rate of Giardia lamblia was 1.6% and that of Entamoeba soli 0.5%. In T. trichiura infection, the egg Positive rate of females (29.9%) was much higher than that of males (17.2%). Among the age groups, 10~19 year group showed the highest inflection rate, 32.4%. It was revealed that the prevalence of intestinal parasitic infections among the inhabitants of remote islands should be still high in comparison with ever-reported ones in urban or rural areas.

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Infection status of larval anisakids in Astroconger muyias.for collected from the Southern Sea near Pusan (부산 일대에서 시판되는 붕장어의 Anisakis 유충 감염상)

  • 송수복;황은경
    • Parasites, Hosts and Diseases
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    • v.30 no.4
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    • pp.263-268
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    • 1992
  • A study was presented on the anisakid larvae in Astroconger myriaster which were caught at the Southern Sea and waled at Pusan area. The nematodes were morphologically classified into Anisakis sp. and Centracgecum sp. after fixation in 70% ethanol and clearing in lactophenol. Total of 1, 768 larval anisakids were collected from 259(67.8% positive rate) out of 382 examined A. myriaster. Total 642 larvae of Anisakis sp. were obtained from 94 (24.6%) and 1, 126 Ccntracaecum sp. were recovered from 165 (43.1%) fish. The average number of worms per infected fish was 4.6. The infection rate increased according to the length of fish, and all of the fish over 71 cm were found infected. The numbers (proportions) of recovered worms by the organs were 1, 440 (80.5%) in the omentuin, 166(9.4%) in the intestine, 107(6.0%) in the stomach, 32(1.8%) in the skin, 18(1.0%) in the muscle, 13(0.7%) in the liver, and 2(0.1%) in the head. The larvae in the muscle may infect the humans who are enjoying raw sliced meat of the fish.

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Trematodes of the genus Haematoloechus (Digenea: Plagiorchiidae) from frogs in Korea (한국산 개구리류에 기생하는 Haematoloechus속 (Digenea: Plagiorchiidae) 흡충류)

  • Kim, Gi-Hong;Im, Han-Jong;Yun, Il-Byeong
    • Parasites, Hosts and Diseases
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    • v.30 no.4
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    • pp.245-254
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    • 1992
  • Total 242 Rana nigromaculata and g R. catesbeiana were collected from the various localities in Korea from February 1989 to July 1991, and their lungs were examined. Five species in genus Haematoloechus, i. e., H. sibiricus japonicus (Yamaguti, 1936), H. nanchangensis Hsiung, 1934, H. variegatus (Rudolphi, 1819), H. lobatus (Seno, 1907), H. lobatus koreanus, were identified in this study. Among them, H. lebatus koreanus was a new subspecies and H. variegatus and H. lebatus were newly recorded from Korea.

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Characteristics of Heat Transfer of Natural Convection for Magnetic Fluids in Annular Pipes (이중원관내 자성유체의 자연대류에 대한 전열특성)

  • Park, J.W.;Jun, C.H.;Seo, L.S.;Ryu, S.O.
    • Journal of the Korean Magnetics Society
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    • v.12 no.2
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    • pp.73-79
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    • 2002
  • Compared with Newtonial fluids, magnetic fluids have effects on magnetic force. In this study, the purpose is to research the heat transfer characteristic of magnetic fluids which have metalic and fluid characteristics as the external pipe is being cooled and internal pipe is heated. This study found the experimental results from the study of the variety of natural convection for magnetic fluids and the characteristics of the heat transfer by using numerical analysis according to the strength and direction of the magnetic fields from being imposed from the outside. Natural convection of magnetic fluids was controlled by the impressed magnetic fields, and the result of mean nusselt number was calculated. If the impressed magnetic field is in the direction of gravity or the strength of impressed magnetic field is more than -14 mT in the opposite direction, the heat transfer is more than that without the impressed magnetic field. If the strength of impressed magnetic field is less than -14 mT in the opposite direction, it is smaller than that without the impressed magnetic field. Especially, when the strength of the magnetic field is -14 mT, the heat transfer was at the minimum.

Two Children with Nontyphoidal Salmonellosis Assumed by Pets (애완동물을 통해 전파된 것으로 의심되는 비장티푸스성 살모넬라 균혈증 2례)

  • Kim, Jong Deok;Choi, Seong Yeol;Kim, Dong Soo;Kim, Ki Hwan
    • Pediatric Infection and Vaccine
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    • v.20 no.1
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    • pp.41-45
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    • 2013
  • Nontyphoidal Salmonella are gram negative bacilli organism, which may induce systemic infection such as febrile enteritis, bacteremia, and osteomyelitis. Main route of infection is known as food but also possible through reptile, amphibian, and fish raised as pets in the house. There is no known cases report of Salmonella infection through pets in Korea and also rare in the overseas. We report 2 patients who visited Severance children's hospital with chief complaint of fever and diagnosed as nontyphoidal salmonellosis. Each case had a history of raising turtle or tropical fish with possibility of Salmonella infection through these pets. Increasing incidence of raising pet reptile and fish lately, contact precaution and proper prevention and control of Salmonella infection of these pets especially in children under 5 years old are necessary due to higher risk of serious complications of salmonellosis.

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Development of mass rearing technique of Tyrophnn putrescentiae (Acari: Acaridae) found in house dust (집먼지에 서식하는 긴털가루진드기(진드기목: 가루진드기과)의 대량 사육방법 개발)

  • 이한일;이인용
    • Parasites, Hosts and Diseases
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    • v.35 no.3
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    • pp.149-154
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    • 1997
  • A storage mite, Tyrophcgus putrescentiae, is recently known to be widely distributed in Korea, being commonly found in house dust, and may, therefore, be allergenically important. The purpose of this study was to develop mass rearing techniques for supplying a large quantity of allergens. The laboratory mouse food powder gave the highest yield, showing 1,251.5-fold increase in number after 10 weeks, and the mixed powder of laboratory mouse food and yeast (1 : 1) also gave same level of the production (1.203 1-fold increase in week 10). Several different combinations of temperature and relative humidity conditions were compared, and the maximum propagation was obtained at $25^{\circ}C$ and 64% RH, showing 960-fold increase in number. When the same amount of culture media was used the size of the culture container did not significantly influence the quantitative yield of T. putrescentice mites.

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Biological Control Against Aphids Using Natural Enemies in Tropical Plants Resources Research Center of Korea National Arboretum (국립수목원 열대식물자원연구센터 내 진딧물류 해충의 생물학적 방제 효과에 관한 연구)

  • Jin, Hye-Young;Ahn, Tai-Hyeon;Song, Jeong Hwa;Lee, Junseok;Choi, Ha Yong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.15 no.1
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    • pp.27-33
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    • 2012
  • This study was performed in the Tropical Plant Resources Research Center of Korea National Arboretum to assess the effects of natural enemy attack on aphid population feeding on tropical plants. We measured the density of leaf-feeding aphids, Myzus persicae and Aphis gossypii, cohabiting with 5 types of tropical plants at intervals of approximately 2 weeks after introducing their natural enemy, Aphidius colemani. The density of aphids cohabiting with 4 types of tropical plants-Sanchezia parvibracteata, Hibiscus rosa-chinensis, Ficus kurzii, and Aloysia triphylla-started decreasing after 2 weeks of observation and was completely in control after 4 weeks of observation; however, the density of aphids cohabiting with the tropical plant, Hamelia patens, increased during 22 weeks of observation but decreased after the $23^{rd}$ week of observation. We suggest that a banker plant is necessary for the maintenance of A. colemani in tropical greenhouses, and monitoring studies on H. patens, which was weakest against the aphids, should be performed. Our results indicate that biological pest management strategies using their natural enemies were formulated for the construction of new tropical greenhouses.

A Review on the Insecticidal Activity of Neem Extracts (Azadirachtin) and its Current Status of Practical use in Korea (님추출물 아자디라크틴의 살충활성과 국내 이용현황에 대한 고찰)

  • Kim, Dong-soon
    • Korean journal of applied entomology
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    • v.60 no.4
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    • pp.463-471
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    • 2021
  • As a tropical plant, the neem tree (Azadirachta indica) has been used for a long time for disease and pest control and medical purposes. In this paper, we reviewed for the active ingredient of neem, the mode of action of azadirachtin in terms of insect growth regulation, repellent, feeding inhibition and oviposition against plant pests. And also we reviewed the current status of practical use in Korea. Among 57 products of neem-based eco-friendly organic agricultural materials distributed in Korea, seven products were certified for their efficacy. The average azadirachtin content of the seven products was 0.38%, which was 5.5 times less than the average content of 2.1% distributed worldwide. In the control effect on neem products in Korea, it showed some variation on aphids, but most showed a control effect of more than 90%. The treatment effects of Lycorma delicatula nymphs were 73-77%, and the control effects for thrips were obtained in the range of 50-72% mortality. The mortality effects against bug and moth species were generally low. It is expected that this review would provide important information necessary for the understanding of distributed neem products and the interpretation of experimental data.