Circadian temperature rhythm in breeding sows: differences between days in oestrus and anoestrus after weaning.

Background: Mammals are subject to circadian rhythms for the control of various physiological events. One of the parameters known to be subject to variations throughout the day is body temperature, which is also subject to influences such as environmental temperature. However, there are not many studies on these rhythms in breeding sows.

Circadian rhythmicity in schizophrenia male patients with and without substance use disorder comorbidity.

Circadian rhythmicity is associated to clinical variables that play an important role in both schizophrenia (SZ) and substance use disorders (SUD), although the characteristics of the coexistence of these two diagnoses (SZ +) remain mostly unknown. Hence, we studied a sample of 165 male patients divided in three groups each of 55, according to their diagnoses (SZ + , SZ, and SUD), as well as a healthy control (HC; n = 90) group. Alongside with sociodemographic and clinical variables, circadian rhythms were registered through a sleep-wake data structured interview, a circadian typology questionnaire, and distal skin temperature (DST) using the Thermochron iButton every 2 min during 48 h.

[Cognitive reserve. A proposal for a new conceptual hypothesis].

Introduction: Currently, there is a lack of consensus on the definition of the concept of cognitive reserve, the elements that make it up and the relationship between them, despite the notable increase in the number of studies conducted on the subject.

Materials And Methods: A multi-domain conceptual model with two factors is proposed: general reserve and domain-specific reserve. The domain-specific reserve, in turn, would be divided into four areas: cognitive, behavioural, emotional and social.

Membrane lipids and maximum lifespan in clownfish.

The longevity-homeoviscous adaptation (LHA) theory of ageing states that lipid composition of cell membranes is linked to metabolic rate and lifespan, which has been widely shown in mammals and birds but not sufficiently in fish. In this study, two species of the genus Amphiprion (Amphiprion percula and Amphiprion clarkii, with estimated maximum lifespan potentials [MLSP] of 30 and 9-16 years, respectively) and the damselfish Chromis viridis (estimated MLSP of 1-2 years) were chosen to test the LHA theory of ageing in a potential model of exceptional longevity. Brain, livers and samples of skeletal muscle were collected for lipid analyses and integral part in the computation of membrane peroxidation indexes (PIn) from phospholipid (PL) fractions and PL fatty acid composition.