Tropospheric scintillation is caused by variations of refractive index due to turbulence. The only meteorological input parameter for two common current scintillation models by Karasawa et al. and by ITU-R is the monthly average of wet part of refractivity Nwet at ground level, which is not directly associated with turbulence. The diurnal correlation betweenNwet and scintillation variance is ve...

Diurnal variations in the myocardium have been described at several levels, including gene expression, cellular signaling, metabolism, contractile function, and dysfunction. Regarding myocardial metabolism, carbohydrate, fatty acid, amino acid/protein, and coenzyme metabolism have all been shown to oscillate in the heart in a manner dependent on the time of day. The purpose of this review is to...

An evaluation is made of techniques that have been or could be employed to determine the existence and nature of worldwide variations in atmospheric electric phenomena. I n the course of a discussion of surface measurements, data from six sites on the surface of thc earth are presented. The use of airborne vehicles in studies of global phenomena is discussed and results from soundings and trans...

AIM To elucidate the diurnal variation in human corneal thickness over a 48 hour period. METHOD Changes in central corneal thickness were monitored in eight healthy subjects (four male, four female) aged between 10 and 63 years using an ultrasonic pachymeter. Measurements were made over a 48 hour period-immediately before sleep, immediately upon waking and at 15, 30, 45 minutes, 1, 1.5, 2, 2....

Diurnal variability of skin conductance level (SCL) was examined in two complementary experiments, simultaneously with variability of skin temperature (ST) and that of simple reaction time (RT) which was recorded as a behavioural index of arousal. In Experiment I, 6 subjects spent 6 days in the laboratory in homogeneous conditions. Three recording sessions, each lasting 2 h, began, respectively...

Synthesis and release of vitellogenin in the crustacean Isopoda, Porcellio dilatatus, were maximal during premolt. At that time, diurnal variations occurred in the haemolymph protein level and in the synthesis and release of vitellogenin and other proteins in the haemolymph. The pattern of variations was always identical and bimodal: the minima were at dusk and at dawn when the maxima occurred ...