Syrian hamsters show complex social play behavior and provide a valuable animal model
for delineating the neurobiological mechanisms and functions of social play. In this review …

The harderian gland was first described in 1694 by Johann Jacob Harder (1656-1711). It
occurs in most terrestrial vertebrates and is located within the orbit where, in some species, it …

Besides its presence in the pineal gland, melatonin has been found in a variety of other
tissues as well. The indoleamine also has been identified in invertebrates including an …

Melatonin has not only to be seen as a regulator of circadian clocks. In addition to its
chronobiotic functions, it displays other actions, especially in cell protection. This includes …

The normal 24 hours patterns of melatonin were described in experimental animals and
man. The rhythms are generated by neuronal activity originating in the suprachiasmatic …

The harderian gland is an orbital gland of the majority of land vertebrates. It is the only
orbital gland in anuran amphibians since the lacrimal gland develops later during …

NAT, HIOMT and melatonin are described in the extra-orbital lacrimal glands. The extra-
orbital lacrimal glands of female Syrian hamsters contain higher NAT activity and melatonin …

Metabolic syndrome is a global health problem in adults and its prevalence among children
and adolescents is rising. It is strongly linked to a lifestyle with high-caloric food, which …

The perception of melatonin as a mediator of darkness, formed in a circadian fashion,
circulating in subnanomolar concentrations, and removed as 6-sulfatoxymelatonin, reflects …

The Harderian gland is a tubuloalveolar gland located within the ocular orbit of many
terrestrial species, especially those possessing a nictitating membrane. It was first described …