BACKGROUND Cardiovascular disease is the major contributor to excess morbidity and mortality in winter. With the rise in temperatures through global warming, and the use of central heating and air conditioning, this seasonal variation may be declining. AIM To study possible changes in seasonal variation in case-fatality rates of myocardial infarction (MI), in men and women, over a 20-year per...

This study was conducted to characterize periphyton biomass, productivity, and algal species composition, and to examine how these parameters changed seasonally over the course of two years in Walker Branch, a temperate forest stream. Seasonal variations in several factors potentially controlling periphyton (irradiance, streamwater nutrient concentrations, temperature, and the incidence of seve...

—Seasonal temperature variation at any location is most strongly regulated by the annual cycle of solar insolation, which is controlled by latitude and orbital parameters; other factors are continentality, albedo feedbacks, stratification and advection, and water depth. Seasonal minima, maxima, and range vary with change in mean annual temperature (MAT) across latitudes; seasonal variation in o...

The importance of the seasonal variation of calcitropic hormones to growing skeleton has not been established. We studied whether there exists a seasonal variation in calcitropic hormones, bone mineral density (BMD) and bone remodelling markers in early puberty girls. One hundred and ninety-six girls, mean age 11.4 (sd 0.4) years, in Tanner stage 2 (early puberty) and 3 (mid-puberty) were studi...