martes, 9 de octubre de 2012

"bilateral symmetry"


Symmetry in biology - Wikipedia, the free encyclopedia
  1. en.wikipedia.org/wiki/Symmetry_in_biology - Traducir esta página
    "Bilateral symmetry" redirects here. For bilateral ... The echinodermata, however, exhibit bilateral symmetry in their larvae, and are thus classed as bilaterians.
    Radial symmetry - Spherical symmetry - Bilateral symmetry - Biradial symmetry


  2. https://www.google.es/search?q=%22bilateral+symmetry%22&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:es-ES:official&client=firefox-a

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  3. Bilateral (left/right) symmetry

    evolution.berkeley.edu/evolibrary/.../arthropods... - Traducir esta página
    In this respect, arthropods are built like humans are; the right half of an arthropod is a mirror image of its left half — this is called bilateral symmetry (bi = two, latus ...

  4. Bilateral symmetry - Merriam-Webster Online

    www.merriam-webster.com/.../bilateral%20sym... - Traducir esta página
    symmetry in which similar anatomical parts are arranged on opposite sides of a median axis so that only one plane can divide the individual into essentially ...

  5. What is bilateral symmetry

    wiki.answers.com › ... › Categories › Science - Traducir esta página
    Bilateral Symmetry- is when an organism can be divided into right and left halves, identical. Does a horse have a radial symmetry or bilateral symmetry? A horse ...

  6. Bilateral Symmetry Definition

    marinelife.about.com › ... › Glossary - Traducir esta página
    Definition of bilateral symmetry as it is used in referring to marine life, with examples.

  7. What Is Bilateral Symmetry?

    marinelife.about.com/.../what-is-bilateral-symmet... - Traducir esta página
    9 Apr 2012 – Gray Seal / Johan J. Ingles-Le Nobel, Flickr Bilateral symmetry is the arrangement of an organism's body parts into left and right halves on ...

  8. bilateral symmetry - definition of bilateral symmetry by the Free ...

    www.thefreedictionary.com/bilateral+symmetry - Traducir esta página
    Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one ...

  9. Bilateral symmetry | Define Bilateral symmetry at Dictionary.com

    dictionary.reference.com/.../bilateral+symmetry - Traducir esta página
    a basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline. Relevant ...
  10. [PPT] 

    Bilateral Symmetry

    people.eku.edu/.../Zoo/PLATYNEMSUMI.ppt - Traducir esta página
    Formato de archivo: Microsoft Powerpoint - Versión en HTML
    bilateral symmetry has allowed several other important changes in body structure. Cephalization- concentration of the nerve tissue into a head; which allow for a ...

  11. Ontogenetic origins of floral bilateral symmetry in Moringaceae ...

    www.amjbot.org/content/90/1/49.short - Traducir esta página
    de ME Olson - 2003 - Citado por 12 - Artículos relacionados
    Abstract. Floral morphology of the 13 species of Moringa ranges from actinomorphic flowers with little hypanthium to highly zygomorphic flowers with ...

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    • Locate full-text (Opens in a new window) |   Show abstract | Related documents


      The sensory pits of the nymphs of the planthopper Issus coleoptratus were investigated using light and electron microscopic techniques. Sensory pits consist of a bowl-shaped depression in the cuticle (25-70 μm in diameter) covered by a transparent cupola of presumably waxy material. Each pit is equipped with a long sensory hair that emerges from the inner wall of the pit and extends horizontally for about two thirds of the pit diameter. The cupola emerges from the rim of the pit opposite to the socket of this hair. Additional small sensory hairs extend into the base of the cupola. While the ultrastructure of these small hairs resembles that of other mechanoreceptive sensory hairs of insects, that of the long hairs shows several peculiarities. Sensory pits are dispersed over the frontal part of the head, the tergites of thoracic and abdominal segments. On the different parts of the exoskeleton, the orientation of long hairs within the pits varies in a systematic fashion with respect to the body axes. Size, location, and orientation of the pits show almost perfect bilateral symmetry. Their number increases with each moult. Comparative data show that the level of structural complexity of these sense organs varies considerably within this group of insects.  
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    • Locate full-text (Opens in a new window) |   Show abstract | Related documents
      Background: The overwhelming majority of animal species exhibit bilateral symmetry. However, the precise evolutionary importance of bilateral symmetry is unknown, although elements of the understanding of the phenomenon have been present within the scientific community for decades.Presentation of the hypothesis: Here we show, with very simple physical laws, that locomotion in three-dimensional macro-world space is itself sufficient to explain the maintenance of bilateral symmetry in animal evolution. The ability to change direction, a key element of locomotion, requires the generation of instantaneous " pushing" surfaces, from which the animal can obtain the necessary force to depart in the new direction. We show that bilateral is the only type of symmetry that can maximize this force; thus, an actively locomoting bilateral body can have the maximal manoeuvrability as compared to other symmetry types. This confers an obvious selective advantage on the bilateral animal.Implications of the hypothesis: These considerations imply the view that animal evolution is a highly channelled process, in which bilateral and radial body symmetries seem to be inevitable.Reviewers: This article was reviewed by Gáspár Jékely, L. Aravind and Eugene Koonin. © 2012 Holló and Novák; BioMed Central Ltd.

      Author keywords

      Bilateral symmetry; Drag; Drag coefficient; Manoeuvrability; Radial symmetry
       
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