• 제목/요약/키워드: Zoology

검색결과 3,104건 처리시간 0.019초

한국의 개미상

  • 최병문
    • 한국토양동물학회:학술대회논문집
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    • 한국토양동물학회 1997년도 총회 및 춘계학술대회
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    • pp.5-6
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    • 1997
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Heat Stress Causes Aberrant DNA Methylation of H19 and lgf-2r in Mouse Blastocysts

  • Zhu, Jia-Qiao;Liu, Jing-He;Liang, Xing-Wei;Xu, Bao-Zeng;Hou, Yi;Zhao, Xing-Xu;Sun, Qing-Yuan
    • Molecules and Cells
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    • 제25권2호
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    • pp.211-215
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    • 2008
  • To gain a better understanding of the methylation imprinting changes associated with heat stress in early development, we used bisulfite sequencing and bisulfite restriction analysis to examine the DNA methylation status of imprinted genes in early embryos (blastocysts). The paternal imprinted genes, H19 and Igf-2r, had lower methylation levels in heat-stressed embryos than in control embryos, whereas the maternal imprinted genes, Peg3 and Peg1, had similar methylation pattern in heat-stressed embryos and in control embryos. Our results indicate that heat stress may induce aberrant methylation imprinting, which results in developmental failure of mouse embryos, and that the effects of heat shock on methylation imprinting may be gene-specific.

Larvicidal potency of selected xerophytic plant extracts on Culex pipiens (Diptera: Culicidae)

  • ABUTAHA, Nael;AL-MEKHLAFI, Fahd A.;AL-KERIDIS, Lamya Ahmed;FAROOQ, Muhammad;NASR, Fahd A.;AL-WADAAN, Muhammad
    • Entomological Research
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    • 제48권5호
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    • pp.362-371
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    • 2018
  • Chemical insecticides released into the environment may have adverse biological effects. Therefore, there is a need for ecofriendly insecticides for mosquito control. Xerophytic plant extracts that may provide more ecofriendly active component were evaluated against Culex pipiens 4th instars. Plant extracts prepared using different solvents with a Soxhlet apparatus and different concentrations were tested against Culex pipiens larvae. The effects were observed at 24 h and 72 h intervals and $LD_{50}$ and $LD_{90}$ values determined. Chloroform ($CHCl_3$) and ethyl acetate (EtOAc) extracts of Althaea ludwigii were the most effective against Cx. pipiens $4^{th}$ instars, but were highly dependent on extract concentrations and exposure time. Results suggest that A. ludwigii extracts contain bioactive compounds, such as phenols and saponins, that may provide effective Cx. pipienslarval control. However, the extract was found to be toxic to zebrafish larvae, and may be toxic to other aquatic fauna. Further studies to determine the active components and toxicity to other fauna are needed.

국내미접 푸른줄까마귀왕나비(나비목, 네발나비과) 보고 (First Discovery of Euploea eunice (Godart, 1819) (Lepidoptera, Nymphalidae) from Korea)

  • 이동준;이재석;김종원;이현;노승진
    • 한국응용곤충학회지
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    • 제61권2호
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    • pp.289-291
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    • 2022
  • 본 연구를 통해 국내미기록속인 까마귀나비속의 푸른줄까마귀왕나비를 최초로 보고한다. 푸른줄까마귀왕나비의 암컷 형태와 생식기, 채집지 등의 정보를 제공하였다. 또한 신속한 종 동정을 위한 DNA 바코드 염기서열을 정보를 제공하였다.