Gene expression in the female tree swallow brain is associated with inter- and intra-population variation in glucocorticoid levels.

Studies of the evolutionary causes and consequences of variation in circulating glucocorticoids (GCs) have begun to reveal how they are shaped by selection. Yet the extent to which variation in circulating hormones reflects variation in other important regulators of the hypothalamic-pituitary-adrenal (HPA) axis, and whether these relationships vary among populations inhabiting different environments, remain poorly studied. Here, we compare gene expression in the brain of female tree swallows (Tachycineta bicolor) from populations that breed in environments that differ in their unpredictability.

Ultraviolet irradiation increases size of the first clutch but decreases longevity in a marine copepod.

An important component of life history theory is understanding how natural variation arises in populations. Both endogenous and exogenous factors contribute to organism survival and reproduction, and therefore, it is important to understand how such factors are both beneficial and detrimental to population dynamics. One ecologically relevant factor that influences the life history of aquatic organisms is ultraviolet (UV) radiation.

Change in the Lipid Transport Capacity of the Liver and Blood during Reproduction in Rats.

To support the high energetic demands of reproduction, female mammals display plasticity in many physiological processes, such as the lipid transport system. Lipids support the energy demands of females during reproduction, and energy and structural demands of the developing offspring via the placenta or milk during the suckling period. We hypothesized that key proteins supporting lipid transport in reproductive females will increase during pregnancy and lactation, but drop to non-reproductive levels shortly after reproduction has ended.

[Occupational Health Physicians and Rehabilitation - A Cross-sectional Study on Occupational Health Care in Schleswig-Holstein and Baden-Württemberg].

Description and explanation of involvement of occupational health physicians in rehabilitation Data were collected by a survey of occupational health physicians in Schleswig-Holstein and Baden-Württemberg. Logistic regression models were calculated to identify determinants of the involvement of occupational health physicians before, during and after rehabilitation. During the last year 70% of the occupational health physicians have supported at least one worker when applying for medical rehabilitation.