نتایج جستجو برای: day light
تعداد نتایج: 721860 فیلتر نتایج به سال:
Background: Studies have shown that variation in light-dark cycle influences secretion of many hormones. The aim of this study was to investigate the effects of different periods of darkness on serum level of LH, FSH, testosterone and cortisol in male rats. Methods: In this laboratory experimental study, 30 male Wistar rats were randomly divided into control (exposed to 12h light - 12h dark)...
Tropospheric ozone is a major air pollutant affecting plants worldwide. Plants in northern regions can display more ozone injury than plants at lower latitudes despite lower ozone levels. Larger ozone influx and shorter nights have been suggested as possible causes. However, the effects of the dim light present during northern summer nights have not been investigated. Young Trifolium subterrane...
The purpose of this study was to investigate whether there are any differences in tooth movement or in the response of periodontal tissue to orthodontic force when the force is applied at different times of the day. One hundred 6-week-old male Wistar rats were divided into one control group without force application and three experimental groups based on the time of day the force was applied to...
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