“
“Most of the phosphorus in the resting seed is stored inside protein storage vacuoles as PA (phytic acid; InsP(6)). The biosynthesis and accumulation of PA can be detected beginning from a few days after anthesis and seem
to continue during seed development until maturation. The first step in PA biosynthesis is the formation of Ins3P by conversion of glucose 6-phosphate. This is then followed by a sequential and ordered phosphorylation of the remaining five positions of the inositol ring by a number of kinases, resulting in PA. Identification of low-PA mutants in cereals, legumes and Arabtdopsis is instrumental for resolving the biosynthetic pathway and identification GDC-0941 mouse of genes controlling the accumulation of PA. Mutations in
seven genes involved in the metabolism of PA have been identified and characterized among five plant species using GSK2879552 research buy induced mutagenesis and insertion elements. Understanding the biosynthetic pathway and genes controlling the accumulation of PA in plant seeds and how PA may balance the free phosphate is of importance for molecular breeding of crop plants, particularly cereals and legumes.”
“High altitude exposure normally leads to a marked natriuresis and diuresis. Acute mountain sickness is often associated with fluid retention, to which an elevated cortisol may contribute. Most investigators report a rise in resting cortisol with ascent, but little data exist regarding the cortisol response to
a day trekking. We therefore measured salivary cortisol during ascent to >5 000 m in a cohort of between 42-45 subjects following a 6-h trek (samples taken between 15:30-16:30 h) and between 15-20 subjects at rest (morning samples taken between 08:00-09:00 h). Morning resting cortisol [nmol/l, mean +/- sd, (range)] was 5.5 +/- 2.9 (2.13-13.61) at 1 300 m; this website 4.7 +/- 6.8 (1.4-27.02) at 3 400 m, and significantly (p = 0.002) rose between 4 270 m [3.5 +/- 2.1 (1.4-8.34)] and 5 150 m [14.5 +/- 30.3 (1.9-123.1)]. Post-exercise cortisol [nmol/l, mean +/- sd, (range)] dropped between 3 400 m [7 +/- 6 (1.5-33.3)] and 4270 m [4.2 +/- 4.8 (1.4-29.5)] (p = 0.001) followed by a significant rise in post-exercise cortisol between 4 270 m [4.2 +/- 4.8 (1.4-29.5)] and 5 150 m [9.2 +/- 10.2 (1.4-61.3)] (p<0.001). There were no significant associations between severity of acute mountain sickness and cortisol levels. There was a significant though weak correlation between cortisol post-exercise at 5 150 m and oxygen saturation at 5 150 m (rho = -0.451, p=0.004). In conclusion, this is the largest cohort to have their resting and post-exercise cortisol levels ascertained at high altitude.