Does age decrease nitric oxide synthesis and responsiveness in human platelets and increases formation of monocyte-platelet aggregates?
These data suggest that platelet NO production and responsiveness decrease with age, and this is reflected in increased circulating MPA.
Seeds of O. cumana and O. aegyptiaca are already receptive before conditioning. Thus, conditioning is not involved in stimulant receptivity. A hypothesis is put forward, suggesting that conditioning includes (a) a parasite-specific early phase that allows the imbibed seeds to overcome the stress caused by failing to receive an immediate germination stimulus, and (b) a non-specific later phase that is identical to the pregermination phase between seed imbibition and actual germination that is typical for all higher plants.