• 제목/요약/키워드: Lizard

검색결과 40건 처리시간 0.023초

A Comparison of Shortening and Shortening Speed in Sartorius, Gastrocnemius and Rectus Abdominis Muscles of Uromastix hardwickii

  • Fehmeena, S.;Azeem, M. Abdul
    • The Korean Journal of Physiology
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    • 제28권1호
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    • pp.61-70
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    • 1994
  • A new method is used to record the actual shortening produced during the auxotonic activity of the sartorius (SAR), gastrocnemius (CAS) and rectus abdominis (RAB) muscles of a lizard Uromastix. The auxotonic twitch and tetanus records thus obtained were used for the first time to calculate the coefficient of linear shortening (COLS). This coefficient represent the relative Index between change in length $(\Delta\;L=L_0-L_1)$ and tension $({\Delta}P\;P_0-P_1)$ due to shortening at the steepest rising phase of the twitch and tetanus, recorded at resting length. In addition to this, maximum shortening $(S_{max})$ and auxotonic tensions were also determined at resting lengths of these muscles. The COLS was found to express the speed of shortening and auxotonic tensions are suggested to be of value to express the internal architecture of SAR, GAS & RAB muscles. The results are discussed in terms of contractile and elastic elements of the muscles alongwith the importance of shortening at resting lengths in skeletal muscles.

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Mating behavior of the Mongolian racerunner (Eremias argus; Lacertidae, Reptilia)

  • Kim, Bin-Na;Kim, Ja-Kyeong;Park, Dae-Sik
    • Animal cells and systems
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    • 제16권4호
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    • pp.337-342
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    • 2012
  • Information about the mating behaviors of an endangered species is critical for the understanding of the natural history of the species as well as in situ and ex situ breeding programs designed to rehabilitate field populations. We describe the mating behaviors of the Mongolian racerunner (Eremias argus), an endangered species in South Korea. The mating of this species consists of precopulatory, copulatory, and postcopulatory stages and is composed of 12 different mating behaviors. During the postcopulatory stage, other males or females not involved in mating show more interference behaviors than during the precopulatory and copulatory stages. The male E. argus has an extraordinarily long postcopulatory bite, which may function as a type of mate-guarding behavior. This study is the first report on the mating behavior of a South Korean reptile.

모로코인(人)의 장신구(裝身具)와 화장(化粧)에 관(關)한 연구(硏究) (A Study of the Personal Ornaments and Make-up of Maroccan)

  • 이순홍
    • 패션비즈니스
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    • 제5권2호
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    • pp.15-34
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    • 2001
  • Ornaments are accessories for the decoration of the body or dress. They aren't unavoidably required one, but serve to make one's dress perfect as decorative industrial art objects. In Morocco, ornaments were initially used as a sign of social position or the class or an incantatory symbol. In effect, they were originally employed to adjust one's dress, not just for decoration, and they were of use for household economy. Gold, silver and handcraft available for exchange were a means of increasing one's property and an indication of social standing and wealth. In particular, the dress and jewelry of a bride was a measure of her family's wealth, regarded as a symbol of her chastity and value. The ornaments symbolically back up people's faith in supernatural power, and their real value is based on implicit form or way of decoration, not the external shape. Specifically, there is a tendency to use the form of animal as a protector, not one to frighten people. In the artistic tradition of Morocco, fish pattern stands for water and rain, and eagle and bird are considered to be related to fate. Scorpion and lizard are depicted as an inquirer of sun, and snake is a symbol of abundance and sexual instinct, being viewed to have an ability to cure disease. Turtle pattern is a symbol of saint because it protects one from the evil. The ornaments are made of gold, silver, amber, clam, garnet, glass, nielle, enamel, glaze, coral or tree, and symbolic patterns are used, including hand(a symbol of five numerals), turtle, lizard, scorpion, eye, triangle, bird and eggs. They are very big and diverse, being categorized into ornaments for the head or the chest, neckless, fibula, earring, bracelet and ring. For Moroccans, make-up is a sort of instinctive behavior to meet aesthetic and sexual desire. They also wear make-up for practical purpose of protection, intentionally inflict a wound on the skin for ceremonial or religious purpose, paint the skin with pigment, or have the part of the body tattooed for incantatory purpose. All this actions are regarded as make-up. The raw material of cosmetics is aker, a vegetable dye. They get the lips or cheeks turn red and paint eyebrows with yellow saffran powder to have a bad devil lose its strength. Tattooing is mainly done by women and viewed as a sign of their value or social organization they belong to. Sometimes that is used to represent a woman's being old enough to marry or getting married already or the frequency of marriage. Besides, tattoo is believed to prevent or remedy loose bowels or cough, depending on its location or pattern, and they often change tattoo according to the change of beauty art.

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실내 사육장에서 도마뱀부치(Gekkojaponicus) 성체와 유체의 주야간 은신처 선호와 경쟁 (Preference and Competition for Shelters at Day and Night between Adult and Juvenile Schlegel's Japanese Gecko (Gekko japonicus) in an Indoor Vivarium)

  • 박일국;김대인;장세윤;김도연;최우진;김종선;구교성;박대식
    • 한국환경생태학회지
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    • 제32권4호
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    • pp.373-380
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    • 2018
  • 도마뱀부치(Gekko japonicus) 성체와 유체의 주야간에 있어 서로 다른 은신처에 대한 선호 및 경쟁 양상을 알아보기 위하여 실내 사육장에서 성체 9개체(암컷 3, 수컷 6), 유체 4개체를 47일간 사육하면서 연구를 수행하였다. 실험결과, 사육장 내에 설치된 은신처 내부의 온도와 내부에서 발견된 도마뱀부치의 체온은 높은 양의 상관을 보였으며, 야간에 은신처 내부보다 외부에서 더 많은 성체와 유체가 관찰되었다. 성체와 유체 모두 특정 은신처에 대한 선호를 보였는데, 특별히 성체는 주간에 온도가 높은 은신처를 더 높은 비율로 선호하였다. 유체가 가장 선호한 은신처는 주야간에 동일한 은신처였다. 최대비율로 이용한 특정 은신처의 이용률은 성체의 경우 주야 간 차이가 유의한 반면, 유체는 차이가 없었다. 체온의 경우 성체와 유생 모두 야간에 은신처 외부에서 발견된 개체가 내부에서 발견된 개체들보다 더 높았다. 성체와 유생 사이의 체온 비교결과, 주간에 성체의 체온이 유체보다 높았으나, 야간에는 차이가 없었다. 이러한 결과는 도마뱀부치가 야행성으로 나은 온도조건을 가진 은신처를 선호하고 성체와 유체 간에는 은신처 이용경쟁이 있음을 보여주며, 더불어 도마뱀부치의 체온과 활동성에 관한 기초정보를 제공해 준다.

Induction of insulin receptor substrate-2 expression by Fc fusion to exendin-4 overexpressed in E. coli: a potential long-acting glucagon-like peptide-1 mimetic

  • Kim, Jae-Woo;Kim, Kyu-Tae;Ahn, You-Jin;Jeong, Hee-Jeong;Jeong, Hyeong-Yong;Ryu, Seung-Hyup;Lee, Seung-Yeon;Lee, Chang-Woo;Chung, Hye-Shin;Jang, Sei-Heon
    • BMB Reports
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    • 제43권2호
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    • pp.146-149
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    • 2010
  • Exendin-4 (Ex-4), a peptide secreted from the salivary glands of the Gila monster lizard, can increase pancreatic $\beta$-cell growth and insulin secretion by activating glucagon-like peptide-1 receptor. In this study, we expressed a fusion protein consisting of exendin-4 and the human immunoglobulin heavy chain (Ex-4/IgG-Fc) in E. coli and explored its potential therapeutic use for the treatment of insulin-resistant type 2 diabetes. Here, we show that the Ex-4/IgG-Fc fusion protein induces expression of insulin receptor substrate-2 in rat insulinoma INS-1 cells. Our findings therefore suggest that Ex-4/IgG-Fc overexpressed in E. coli could be used as a potential, long-acting glucagon-like peptide-1 mimetic.

Physical characteristics and age structure of Mongolian racerunner (Eremias argus; Larcertidae; Reptilia)

  • Kim, Ja-Kyoung;Song, Jae-Young;Lee, Jung-Hyun;Park, Dae-Sik
    • Journal of Ecology and Environment
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    • 제33권4호
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    • pp.325-331
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    • 2010
  • In this study, we have evaluated the physical characteristics of neonate, female, and male Mongolian racerunners (Eremias argus) and determined the age structure of a population of the species in a field located in Taean-gun, Chungnam, South Korea. The physical parameters of females and males, including snout-vent length (SVL), head length, head width, and body mass were found to be significantly interrelated. Male Mongolian racerunners exhibited significantly longer heads than the females, but other physical parameters, such as SVL, head width, and body mass did not differ between the female and male specimens. In the study population, the females ranged in age from two to eleven years old and the males ranged between two to eight years of age. The number of females and males, when separated into different age classes, did not differ within each age class. Male Mongolian racerunners evidenced greater SVL growth coefficients than the females, but asymptotic SVL did not differ between the females and males.

수면 주행 로봇의 안정성 향상을 위한 정적 꼬리 기구변수 최적화 (Robust Optimal Design of Tail Geometry for Stable Water-running Robots)

  • 이동규;장재형;서태원
    • 한국생산제조학회지
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    • 제25권2호
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    • pp.132-137
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    • 2016
  • Biomimetics involves the design of robotic platforms inspired from living creatures to achieve efficient operation under environmental conditions. A development within biomimetics involves investigating the function of a tail and applying it to robot design. This study aims to define the function of a static tail for water-running robots, and optimize its geometric and compliance parameters. The rolling angle of the tail is determined by the objective function, while the area and fillet ratio are used for geometric design and compliance parameters in the rolling and yawing directions. Repeated motion of the water-running robot's footpads at frequencies of 9 and 10 Hz is used as the operating condition. Robust design based on the Taguchi methodology is performed via orthogonal arrays. The optimized tail design derived in this study will be implemented in a robotic platform to improve steering and balancing functions in the pitching direction.

Development of a Bio-mimetic Entertainment Robot with Autonomous Feeding Functionality

  • Cho, Ik-Jin;Choi, Byoung-Jun;Jeong, Kil-Woong;Lee, Yun-Jung
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.1525-1529
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    • 2004
  • Most of the recently developed robots are human friendly robots which imitate an animal or human such as entertainment robot, bio-mimetic robot and humanoid robot. Interest in these robots are increasing since the social trend is focused on health, welfare, and graying. By these social backgrounds, robots become more human friendly and suitable for home or personal environment. The more bio-mimetic robots resemble living creature, the more human feels familiarity. People feel close friendship not only when they feed a pet, but also when they watch a pet having the food. Most of entertainment robots and pet robots use internal-type batteries and have a self-recharging function. Entertainment robots and pet robots with internal-type batteries are not able to operate during charging the battery. So far there have been a few robots that do not depend on a battery. However, they need a bulky energy conversion unit and a slug or foods as an energy source, which is not suitable for home or personal application. In this paper, we introduce a new bio-mimetic entertainment robot with autonomous feeding functionality, called ELIRO-1(Eating LIzard RObot version 1). The ELIRO-1 is able to find a food (a small battery), feed by itself and evacuate. We describe the design concept of the autonomous feeding mechanism of the ELIRO-1, characteristics of sub-parts of the manufactured mechanism and the control system.

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RAPD를 이용한 한국산 줄장지뱀(Reptilia: Squamata)의 종내 다양성에 관한 연구 (Intraspecific Diversity of Korean Takydromus wolteri(Reptilia: Squamata) Based on Randomly Amplified Polymorphic DNA (RAPD) Analysis)

  • 장민호;송재영;정규회
    • 환경생물
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    • 제22권2호
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    • pp.295-299
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    • 2004
  • 한반도 전지역에 줄장지뱀이 서식하고 있지만, 이 종에 대한 연구는 거의 전무한 상태이다. 한반도의 5지역(경기도, 충청북도, 제주도, 전라남도, 경상남도)의 한국산 줄장지뱀에 대해 RAPD method를 통한 종내 유전적 차이를 비교하였다. 총 28개의 primer를 사용하였고, 그 중 유의성이 있는 17개의 primer에 대한 결과를 Nei's(1972) genetic distance를 통해 유전적 거리와 UPGMA 방법을 통한 phenogram을 구하였다. 그 결과 총 68개의 밴드를 확인했고,이 중 87%인 59개의 polymorphism이 확인되었다. 이를 통한 phenogram에서는 GG1, GG2, CB1, CB2, JN이 Group 1을 이루었으며,JJ1, JJ2, GN이 Croup 2를 이루었다. 줄장지뱀의 경우 지리적 격리를 통한 집단간의 종내 변이가 발생한 것으로 추정된다. 특히, 경상남도 지방의 유전적 독립성이 두드러지는데, 이는 다른 분류군인 어류나 양서류에서도 나타나고 있다. 따라서 이들 집단에 대한 형태적, 생태적 그리고 다른 유전적 분석 등을 통한 추가적인 연구가 필요할 것이라고 판단된다.

Identification of Lactoferrin as a Human Dedifferentiation Factor Through the Studies of Reptile Tissue Regeneration Mechanisms

  • Bae, Kil Soo;Kim, Sun Young;Park, Soon Yong;Jeong, Ae Jin;Lee, Hyun Hee;Lee, Jungwoon;Cho, Yee Sook;Leem, Sun-Hee;Kang, Tae-Hong;Bae, Kwang-Hee;Kim, Jae Ho;Jung, Yong Woo;Jun, Woojin;Yoon, Suk Ran;Lee, Sang-Chul;Chung, Jin Woong
    • Journal of Microbiology and Biotechnology
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    • 제24권6호
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    • pp.869-878
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    • 2014
  • In this study, we performed two-dimensional electrophoresis with protein extracts from lizard tails, and analyzed the protein expression profiles during the tissue regeneration to identify the dedifferentiation factor. As a result, we identified 18 protein spots among total of 292 spots, of which proteins were specifically expressed during blastema formation. We selected lactoferrin as a candidate because it is the mammalian homolog of leech-derived tryptase inhibitor, which showed the highest frequency among the 18 proteins. Lactoferrin was specifically expressed in various stem cell lines, and enhanced the efficiency of iPSC generation upto approximately 7-fold relative to the control. Furthermore, lactoferrin increased the efficiency by 2-fold without enforced expression of Klf4. These results suggest that lactoferrin may induce dedifferentiation, at least partly by increasing the expression of Klf4.