American Heritage® Dictionary of the English Language, Fourth Edition
- n. The duration of an organism's daily exposure to light, considered especially with regard to the effect of the exposure on growth and development.
“Taken together, our findings suggest that optimization of experimental conditions such as photoperiod may be necessary to visualize FAA in genetically modified mice.”
“The changing of day length in spring and fall triggers bird migration because "photoperiod" is the only absolutely reliable environmental cue that signals birds that it's”
“I know rut is driving by photoperiod, but what about the effect of a really warm snap?”
“Reindeer, like several other species of deer, show a pronounced seasonal cycle in appetite and growth which appears to follow an intrinsic rhythm entrained by photoperiod and associated with changes in levels of circulating hormones.”
“The photoperiod transducer melatonin and the immune-hematopoietic system".”
“The photoperiod transducer melatonin and the immune-hematopoietic system.”
“Heat energy requirements for plants interact with other environmental factors, such as moisture stress and photoperiod , and thus GDDs may not be a good predictor of plant development under stress.”
“Heat requirements for plant development generally decrease with increasing photoperiod, so fewer GDDs are needed to reach a given growth stage at high latitudes than at low latitudes.”
“The arctic photoperiod is unlikely to be a general constraint to species migrations from the south, as trees and southern species previously occurred further north than at present.”
“The frost-hardening process is initiated even at high temperatures (20 °C) in experimental conditions that mimic the ambient photoperiod .”
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