Rhizosphere ecology of lumichrome and riboflavin, two bacterial signal molecules eliciting developmental changes in plants.

Lumichrome and riboflavin are novel molecules from rhizobial exudates that stimulate plant growth. Reported studies have revealed major developmental changes elicited by lumichrome at very low nanomolar concentrations (5 nM) in plants, which include early initiation of trifoliate leaves, expansion of unifoliate and trifoliate leaves, increased stem elongation and leaf area, and consequently greater biomass accumulation in monocots and dicots. But higher lumichrome concentration (50 nM) depressed root development and reduced growth of unifoliate and second trifoliate leaves.

Awareness of stroke risk factors and warning signs in Nigerian adolescents compared with adults.

Background: Stroke, a significant health problem affecting adults, is increasing among younger age groups, particularly because of changing lifestyles. The aim of the study was to compare the awareness of stroke risk factors and warning signs among students and teachers in selected secondary schools in Osun State, Nigeria.

Methods: This was a cross-sectional survey involving 703 (589 students and 114 teachers) respondents in selected secondary schools in Osun, Nigeria.