photoperiod

(redirected from photoperiodic)
Also found in: Dictionary, Thesaurus, Encyclopedia.

photoperiod

 [fo´to-pēr″e-od]
the period of time per day that an organism is exposed to daylight (or to artificial light). adj., adj photoperiod´ic.

photoperiod

/pho·to·pe·ri·od/ (fo´to-pēr″e-od) the period of time per day that an organism is exposed to daylight (or to artificial light).photoperiod´ic

photoperiod

(fō′tō-pîr′ē-əd)
n.
The daily duration of light and dark to which an organism is exposed, considered especially with regard to its effect on growth and development.

pho′to·pe′ri·od′ic (-ŏd′ĭk) adj.

photoperiod

the length of daylight as compared with the length of darkness in each 24 hour cycle. see PHOTOPERIODISM.

photoperiod

the period of time per day that an organism is exposed to daylight (or to artificial light).
References in periodicals archive ?
Our study showed that the administration of endotoxin induced stress response in animals regardless of the photoperiodic conditions because the elevated cortisol concentration was determined in blood of all LPS-treated ewes.
Effect of geographical origin on the photoperiodic control of reproduction in the white-footed mouse, Peromyscus leuopus.
Such photoperiodic differences are apparent when Cannabis populations obtained from different latitudes are grown together in a northern experimental garden.
Photoperiodic control of the development of the LHRH neurosecretory system of European starlings (Sturnus vulgaris) during puberty and the onset of photorefractoriness.
Capacity for photoperiodic response and endogenous factors in the reproductive cycles of an equatorial sparrow.
Abolition of the seasonal release of luteinizing hormone and testosterone in Alpine male goats (Capra hircus) by short photoperiodic cycles.
Poinsettias are photoperiodic which means flowering is initiated by a change in day length.
The photoperiodic response of the pitcher plant mosquito (Wyeomyia smithii) has shifted toward shorter, more southern day lengths in response to an extended growing season, demonstrating an adaptive evolutionary response to global warming in eastern North America (Bradshaw and Holzapfel 2001).
1] under a photoperiodic regime of 16 hours light and 8 hours dark cycles with Relative Humidity (RH) 55-60%.
photoperiodic hypothesis (shorter winter days cause SAD, (a) perhaps mediated by a summer vs winter difference in duration of nightly melatonin release) (b)