• 제목/요약/키워드: Murina leucogaster

검색결과 7건 처리시간 0.02초

한국산 박쥐 간장의 미세구조적 고찰 (Some Observations on the Fine Structure of Korean Bat Livers)

  • 최병진;엄창섭;장병준;박창현
    • Applied Microscopy
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    • 제31권4호
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    • pp.375-383
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    • 2001
  • 한국산 관박쥐과의 관박쥐 (Rhinolophus ferrmmequinum korai)와 애기박쥐과 Myotis속에 속하는 큰발웃수염 박쥐 (Myotis macrodactylus), 물웃수염박쥐 (Myotis daubentonii ussrinesis) 및 관코박쥐 (Murina leucogaster intermedia)의 활동기 간장 조직을 투과전자현미경으로 관찰하여 이들의 미세구조적 특징을 규명하고 이들 간에 존재하는 차이를 비교 고찰하고자 하였다. 관박쥐는 세포질 내에 $10\sim20$개의 크고 둥근 사립체를 가지고 있었으며, 특히 과산화소체가 잘 발달되어 있었다. 큰발웃수염박쥐는 간세포간 사이의 연접복합체, 특히 부착반점이 잘 발달되어 있었다. 디세강과 동굴모세혈관 속은 섬세한 물질로 채워져 있었다. 물웃수염박쥐는 세포질 내에 당원과립을 많이 가지고 있었으며, 디세강과 동양혈관 속은 섬세한 물질로 채워져 있었다. 관코박쥐는 동굴모세혈관에 기저막이 잘 발달되어 있었으며, Kupffer 세포와 Ito 세포는 관찰되지 않았다. 이상의 결과는 같은 시기의 한국산 박쥐의 간장에서도 종에 따라서 미세구조적 차이가 나타남을 보여주는 것으로 이들은 이들의 생활환경과 식이와 관련이 있을 것으로 추정된다.

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Identification of a PAS Domain-containing Protein in a Mammalian Hibernator, Murina leucogaster

  • Cho, Sang-Gil;Kim, Dong-Yong;Eom, Ki-Hyuk;Bae, Ki-Ho
    • Animal cells and systems
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    • 제13권2호
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    • pp.119-125
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    • 2009
  • Mammalian hibernation is a type of natural adaptation that allows organisms to avoid harsh environment and to increase the possibility of survival. To investigate the molecular link between circadian and hibernating rhythms in the greater tube-nosed bats, Murina leucogaster, we set out to identify circadian genes that are expressed in bats, with specific focus on the PAS domain by using PCR-based screens. We could isolate a eDNA clone, designated as LPAS1, that encodes a protein of 521 amino acid residues. LPAS1 is closely related with CLOCK family with the highest homology to human CLOCK. Based on RT-PCR analyses, LPAS1 transcripts are ubiquitously present in tissues from both summer active and winter dormant periods. Given that LPAS1 is a member of the bHLH-PAS protein superfamily but lacks polyglutamine transactivation domains, it is likely to function as a repressor for endogenous CLOCK to hinder its roles in promoting transcription. Our result will open a new avenue to further examine the functional interconnection between the circadian clock and the circannual clock such as mammalian hibernation.

Thermogenesis and Motor Recruitment of the Pectoral Muscle During Shivering in Arousing Bats Murina Leucogaster

  • Choi, In-Ho;Lee, Youn Sun;Oh, Yung Keun;Jung, Noh-Pal;Gwag, Byoung Joo;Shin, Hyung-Cheul
    • Animal cells and systems
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    • 제5권1호
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    • pp.31-35
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    • 2001
  • Temperate-resident bats exhibit a circadian cycle of torpor and arousal In summer. The physiological role and selective advantage of torpor as an energy saving mechanism have been received much attention by hibernation biologists. However, despite the significance of the recovering euthermic function, the arousal process and mechanism in these animals have been poorly addressed. In this study, we investigated thermogenic and motor activities of a local bat species Murina leucogaster during arousal by simultaneously examining oxygen consumption rate, body temperature ($T_b$) and pectoral electromyography (EMG). We found that Tb of the torpid bats (12-14$^{\circ}C$) was augmented slowly by nonshivering mechanism during the initial awakening phase. The pectoral shivering, gauged by EMG activity, occurred between 17$^{\circ}C$ and 38$^{\circ}C$. Over this Tb range of shivering, heat was produced at a rate of 0.145 kcal $kg^{-1}\;min^{-1}$ to raise 1$^{\circ}C$ $T_b$ per min. Shivering was most intensive at 30-35$^{\circ}C$ where both EMG amplitude and spike frequency were the highest. Activation of the pectoral myofibers seemed to be controlled in a manner that motor units were recruited from smaller to larger sizes, with greater synchronization, as muscle shivering became intensive with increasing $T_b$.

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Metabolic Rate and Thermolabile Properties of Ognev's Great Tube-nosed Bat Murina leucogaster in Response to Variable Ambient Temperature

  • 최인호;오용근;정노팔;강병주;신형철
    • Animal cells and systems
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    • 제2권1호
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    • pp.49-53
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    • 1998
  • The winter-resident Korean bats, Murina leucogaster ognevi, show a circadian cycle of thermoregulation and locomotion in summer, as do other bat species in temperate regions. They are most active between dusk and dawn with body temperature (Tb) of 35-4OC, and are usually torpid in their roost sites for the rest of day with their Tb close to ambient temperature (Ta) of around 15C. The present study was conducted to determine thermogenic and thermolabile properties of the heterothermic bats that would influence their daily feeding activities and ultimately, their energy conservation strategy. Testing on active male Murina, resting metabolic rate (RMR, gauged by oxygen consumption rate) at the lower limit of thermoneutral zone (31C) was 2.0 L kq-1 h-1. The regression slope of RMR below the thermoneutral zone (an index of metabolic thermal sensitivity) was -0.38 L $kg^{-l} h^{-1} C^{-1}$. The metabolic rate at the roost Ta (15C) was 4.5 times the lowest RMR in the active state but becomes nearly zero in the torpid state. This implies that by being torpid during daytime (between dawn and dusk), the individual bats would save about 4.7 kcal each day in mid-summer. Interspecific comparisons of thermal metabolic response over a mass scale suggest that the smaller bats show a relatively higher metabolic rate in thermoneutral zone and a greater thermal sensitivity of metabolism, which follows the general principle seen in homeothermic metabolism. Thermolabile features in metabolic responses seem to be fairly common for these bats in conditions other than a fully active state. Types of thermolabile responses and their energetic significance are discussed.

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한국 박쥐의 한타바이러스 감염에 대한 혈청면역학적 연구 (A Seroimmunologic Study of Bats Infected with Hantavirus in Korea ($1989{\sim}1995$))

  • 박은병;조규봉;박철희;이연태
    • 대한바이러스학회지
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    • 제26권1호
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    • pp.91-99
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    • 1996
  • To understand whether the bats inhabiting in Korea play role as hosts harboring Hantavirus that cause acute febrile diseases, a total number of 802 bats of 9 species were collected from seven provinces in Korea from 1989 to 1995 and tested for the presence of antibodies to Hantavirus by means of immunofluorescent antibody (IFA) technique. The results are summarized as follow. 1. Total 802 captured bats were classified into 9 different species with the following distribution. They were Rhinolophus ferrumequinum, Eptesicus serotinus, Miniopterus sehreibersii, Vespertilio superans, Myotis mystatinus, Murina leucogaster, Myotis formosus, Myotis macrodactylus and Plecotus auritus with numbers and rates of 423 (52.74%), 291 (36.28%), 47 (5.86%), 28 (3.49%), 8 (1.00%), 1 (0.12%) and 1 (0.12%), respectively. The predominant species of the bats was Rhinolophus ferrumequinum with 52.74% of the captured. 2. Among 9 species of bats, species of Rhinolophus ferrumequinum and Eptesicus serotinus were positive with Hantavirus antibody of strain numbers 76-118. The rate of antibody positive was 3.78%. 3. The seasonal differences of Hantavirus antibody in 802 bats tested were 5.83%, 4.17%, 3.67% and 0.64% in winter, spring, summer and autumn, respectively. Again the highest viral antibody prevalence was detected in winter. It could be concluded through the study that certain species of bats inhabiting in Korea play a definite role as the host animals of certain species of Hantavirus.

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제주도에서 박쥐류의 분포에 관한 연구 (A Study on the Distribution of Bats (Chiroptera) in Jeju Island, Korea)

  • 박수곤;김유경;김태욱;박준호;;김가람;박선미;이준원;한상현;오홍식
    • 환경생물
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    • 제33권4호
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    • pp.394-402
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    • 2015
  • 본 연구는 제주도에 분포하는 박쥐류상 (Chiroptera)을 밝히기 위해 2006년 7월부터 2015년 6월까지 용암동굴, 해식동굴, 진지동굴, 생태통로 등으로 지역을 구분하여 조사되었다. 또한 제주도 내 박물관에 소장된 박쥐류 표본을 조사하였다. 연구결과, 3과 6속 8종의 박쥐류의 서식이 확인되었는데, 이 결과는 1928년부터 보고된 사전 문헌기록들과는 다소 다른 양상을 나타내었다. 용암동굴과 진지동굴에서는 관박쥐, 흰배윗수염박쥐, 붉은박쥐, 큰발윗수염박쥐, 긴가락박쥐가 공통적으로 서식하는 것으로 확인되었다. 해식동굴에서는 1개 지역에서만 관박쥐가 확인되었고, 생태통로에서는 관코박쥐와 집박쥐를 비롯한 5종이 확인되었다. 지역 내 박물관에 소장된 표본조사 결과 큰귀박쥐의 표본도 확인되었다. 연구를 통해 확인된 8종 외에 큰집박쥐, 작은긴가락박쥐, 윗수염박쥐, 쇠큰수염박쥐, M. branditii, 물윗수염박쥐, 작은집박쥐 등 7종은 확인되지 않았다. 흥미로운 점은 멸종위기종으로 알려진 붉은박쥐와 한반도에서는 드물게 발견되는 흰배윗수염박쥐가 제주도에서 서식하는 것이 확인된 것과, 관코박쥐도 조사과정에서 처음으로 발견되는 등 다양한 장소에서 박쥐류가 서식하고 있음이 확인되었다는 것이다. 이 연구결과는 제주도에서 박쥐류의 보전을 위한 생물다양성 연구나 생태학적 연구를 하는 데 유용한 자료로 활용될 것이라 판단된다.