منابع مشابه
Circadian clocks: Omnes viae Romam ducunt
The circadian clock in all organisms is so intimately linked to light reception that it appears as if evolution has simply wired a timer into the mechanism that processes photic information. Several recent studies have provided new insights into the role of light input pathways in the circadian system of Arabidopsis.
متن کاملOmnes viae Romam ducunt: Asymptomatic cardiac and noncardiac organ system dysfunction leads to heart failure.
Despite significant progress in the treatment of heart failure, its incidence and prevalence are rising in the United States. In order to further heart failure prevention efforts, the American Heart Association and the American College of Cardiology proposed a classification scheme for heart failure to include stage A patients (those who do not have structural heart disease but are at risk for ...
متن کاملCircadian Biology: Clocks within Clocks
A small cluster of approximately 20,000 neurons in the ventral hypothalamus provide the body with key time-keeping signals and drive circadian rhythms. This circadian clock exhibits surprisingly complex substructures, with inputs from the retina, and outputs to other brain structures. Rather little is known of the neurotransmitters involved, or their regulation.
متن کاملCircadian clocks
The biological world is not static: organisms inhabit environments which change predictably over the course of the day and night. There will therefore be selective advantage to any individuals able to anticipate these changes and attune their physiology and behaviour accordingly. Anticipation of daily cycles is conferred by endogenous timers, biological clocks with an intrinsic period of approx...
متن کاملFeeding and circadian clocks.
The mammalian genome encodes at least a dozen of genes directly involved in the regulation of the feedback loops constituting the circadian clock. The circadian system is built up on a multitude of oscillators organized according to a hierarchical model in which neurons of the suprachiasmatic nuclei of the hypothalamus may drive the central circadian clock and all the other somatic cells may po...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2000
ISSN: 0960-9822
DOI: 10.1016/s0960-9822(00)00739-9