this study evaluated the effect of the intermittent light program on serum and brain melatonin concentrations, antioxidant enzyme activities, and homocysteine concentration in broiler chickens. a total of 60 one-day-old broiler chickens (cobb 500) were distributed in three light-proof controlled rooms (20 chicks per room). all birds were reared in continuous light until 3 days of age. then, chi...

beds. From the Council, Mr. Wake went on, a handsome sum was already received, and now that the 60 beds had been added, a grant towards the cost of their maintenance would be applied for. The Sheffield scheme continues to grow, and there seems little doubt that eventually its adoption may become universal in the city. In this event sufficient money should be available, not merely to support the...

Curves relating flicker frequency (F) to mean critical illumination (I(m)) for threshold response to flickered light, with equal durations of light and no light intervals, and relating illumination (I) to mean critical flicker frequency (F(m)) for the same response, have been obtained from homogeneous data based upon the reactions of dragonfly larvae (Anax junius). These curves exhibit the prop...

PURPOSE Animal studies have indicated that retinal oxygen consumption is greater in dark than light. In this study, oxygen saturation is measured in retinal vessels of healthy humans during dark and light. METHODS The oximeter consists of a fundus camera, a beam splitter, a digital camera and software, which calculates hemoglobin oxygen saturation in the retinal vessels. In the first experime...

Sporangiophores of the fungus Phycomyces exhibit adaptation to light stimuli over a dynamic range of 10(10). This range applies to both phototropism and the closely related light-growth response; in the latter response, the elongation rate is modulated transiently by changes in the light intensity. We have performed light- and dark-adaptation experiments on growing sporangiophores using an auto...

Generally, narcissus is propagated through vegetative methods, but due to their low yield their are not economical. This study was conducted to develop a suitable method for the production of somatic embryos and bulblets in Narcissus papyraceus cv. Shirazi. Bulb scales were placed on the MS medium supplemented with 2,4-D and BAP each at 0.0, 0.25, 0.5 or 1 mg/l concentrations to form somatic em...

PURPOSE The authors examined the circadian change of basal pupil size in light-dark entrained normal rabbits and in entrained rabbits with unilaterally decentralized ocular sympathetic nerves. The pattern of the circadian pupillary rhythm was compared with the circadian patterns of intraocular pressure (IOP) and body temperature in the same rabbits. METHODS Adult male New Zealand albino rabbi...

The role of genetic inheritance in brain development has been well characterized, but little is known about the contributions of natural environmental stimuli, such as the effect of light-dark cycles, to brain development. In this study, we determined the role of light stimuli in neuronal cell migration to elucidate how environmental factors regulate brain development. We show that in early pos...

objective: there has been a growing interest in finding plants with biological active ingredients for medicinal application. materials and methods: three colors of petals of althaea officinalis (a. officinalis) flowers, i.e., pink, reddish pink, and white were examined for total antioxidant activity and flavonoids content. results: the reddish pink flowers of a. officinalis have more antioxidant...