Burnout among general practitioners, a systematic quantitative review of the literature on determinants of burnout and their ecological value.

Burnout is a major social and economic problem, specifically among general practitioners (GPs). The amount of literature on generic determinants of burnout is impressive. However, the size of the library on occupation-specific determinants of burnout among GPs are minimal.

Brassinosteroid biosynthesis and signalling in Petunia hybrida.

Brassinosteroids (BRs) are steroidal plant hormones that play an important role in the growth and development of plants. The biosynthesis of sterols and BRs as well as the signalling cascade they induce in plants have been elucidated largely through metabolic studies and the analysis of mutants in Arabidopsis and rice. Only fragmentary details about BR signalling in other plant species are known.

Nod factor and elicitors activate different phospholipid signaling pathways in suspension-cultured alfalfa cells.

Lipo-chitooligosaccharides (Nod factors) are produced by symbiotic Rhizobium sp. bacteria to elicit Nod responses on their legume hosts. One of the earliest responses is the formation of phosphatidic acid (PA), a novel second messenger in plant cells.

Observations on the iron status during pregnancy in rats. Iron transport from mother to fetus.

The objective of the present study was to investigate a transfer of liver iron in rats from mother to fetus during pregnancy. A decrease in maternal liver iron and an increase in fetal liver iron, in groups of 10 rats, have been shown, based on iron analysis and specific activity of 59Fe.