• Login
    View Item 
    •   CDR Home
    • Graduate School - Theses and Dissertations collections
    • Creighton Theses and Dissertations
    • View Item
    •   CDR Home
    • Graduate School - Theses and Dissertations collections
    • Creighton Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    The Effects of Actinomycin D and Acth on Circadian Steroidogenesis of Hamster Adrenals

    View/Open
    Shiotsuka-MS-1970.pdf (9.594Mb)
    Author
    Shiotsuka, Ronald
    Date
    1970

    Degree
    MS (Master of Science), Biology

    Metadata
    Show full item record
    Abstract

    Abstract
    Rhythmicity is predominant in nature. Sunrise is followed by sunset in a highly predictable periodic sequence. Living organisms are known to be influenced by such periodically occurring phenomena. De Mairan, as early as 1729, observed leaf movements of plants and found these variations to be coincident to the solar period. His observations have been confirmed by other workers as Pfeffer, Bunning, Kalmus and Kleitman. An animal's activity pattern has been called diurnal or nocturnal again in relation to the environmental photo- period of the animal.

    A biorhythm is any regularly recurring change in some biological process, whether it takes place in a cell, tissue, organ, organism or population. Such biorhythms are classified as exogenous or endogenous in origin (Bunning, 1964; Aschoff, 1960; Sollberger, 1965).

    Environmental factors which induce or synchronize rhythmic processes are called Zeitgebers (Aschoff, 1960) or Synchronizers (Halberg, 1954). These may be overt cues such as light and temperature or more subtle geophysical factors such as electrostatic and magnetic force fields (Brown, 1960, 1965).
    URI
    http://hdl.handle.net/10504/120931
    Collections
    • Creighton Theses and Dissertations

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    @mire NV
     

     

    Browse

    All of the CDRCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    @mire NV