Early production and scavenging of hydrogen peroxide in the apoplast of sunflower plants exposed to ozone.

The present work set out to define the processes involved in the early O3-induced H2O2 accumulation in sunflower plants exposed to a single pulse of 150 ppb of O3 for 4 h. Hydrogen peroxide accumulation only occurred in the apoplast and this temporally coincided with the fumigation period. The inhibitor experiments suggested that both the plasma membrane-bound NAD(P)H oxidase complex and cell-wall NAD(P)H PODs contributed to H2O2 generation.

Perceived family functioning, marital status, and depression in parents of boys with attention deficit disorder.

The present study examined the perceptions of parents of children with attention deficit disorder with hyperactivity (ADD/H) regarding their family environment and depression in comparison with a clinical and a nondisabled control group. Parents of children with ADD/H perceived their family environment as less supportive and more stressful than did either the clinical or the nondisabled controls. Specifically, ADD/H parents viewed their families as having lower levels of interpersonal relationships than did either of the control groups.