The environment which living organisms inhabit is not constant and many factors, such as
light, temperature, and food availability, display cyclic and predictable variations. To adapt to …

Mammalian species can be defined as diurnal or nocturnal, depending on the temporal
niche during which they are active. Even if general activity occurs during nighttime in …

Daily rhythms of feeding regulators are currently arousing research interest due to the
relevance of the temporal harmony of endocrine regulators for growth and welfare in …

The suprachiasmatic nuclei (SCN) generate the circadian rhythm of many hormones. The
hormone leptin is a metabolic signal that informs the brain about fat and energy stores of the …

Seasonal brain plasticity contributes to a variety of physiological and behavioral processes.
We hypothesized that variations in GnRH expression and cell proliferation facilitated …

Seasonal photoperiod has impact on the physiology of many plants and animals. Short days
related with the winter are often associated with changes in activity patterns and, in humans …

In vivarium conditions, the growth and attainment of puberty of the offspring of constant
parental pairs have been studied in relation to the calendar month of birth (May or …

Purpose: The use of hamsters and gerbils has increased significantly in a variety of fields,
includingbiological rhythms, reproductive biology, immunology, oncology, and many others …

We have shown that circadian changes in leptin concentrations are inversely linked to
circulating melatonin levels in the Syrian hamster. The present study aimed to assess the …

A pregnant hamster's exposure to changes in environmental factors, such as light,
temperature and nutrition, may influence behavioural and physiological changes in …