Influences on viability and germination of seeds have been studied intensively for many years, particularly for the numer-ous commercially important agricultural, ornamental, and timber species. High germinating seed lots may differ substantially in field emergence when sown at the same time in the same field, and/or may differ in performance after storage in the same environment or transport t...

The temperature has a direct effect on the activity of insect pests and their developmental rate. increasing could profoundly influence population dynamics, life cycle, length reproduction, fecundity, longevity. In present study, impact different temperatures (32, 33, 34, 35 36°C) degree days fitness Spodoptera frugiperda (J. E. Smith) was evaluated under artificial conditions. results showed t...

In this report, we examined the cross-sectional and the 7-year longitudinal changes in blood pressures in adult offspring according to parental longevity. A population of volunteers free of symptomatic cardiovascular diseases who participated to the Supplementation en Vitamines et en Minéraux Antioxydants (SUVIMAX) Vascular Study (mean age 52.3 years; 48.3% women) were examined at baseline and ...

Aging is characterized by a progressive decline in the efficiency of physiological function and by the increased susceptibility to disease and death. Currently, one of the most plausible and acceptable explanations for the mechanistic basis of aging is the “free radical theory of aging.” This theory postulates that aging and its related diseases are the consequence of free radical-induced damag...

BACKGROUND AND PURPOSE We examined the associations of parental longevity with carotid intima-media thickness, carotid plaques, and aortic arterial stiffness in adult offspring. METHODS A population of 1117 volunteers who participated in the SUVIMAX Vascular Study (mean age, 59.7 years; 49.0% women) were included. Carotid-femoral pulse-wave velocity (PWV) was used to assess aortic stiffness. ...

-the cowpea aphid, aphis craccivora koch, is an important pest of robinia pseudoacacia frisia. life table parameters of a. craccivora were determined under natural (16- 33ºc and 32-89% rh, respectively) and laboratory (25 ± 1ºc, rh of 70 ± 5% and a photoperiod of 16:8 h (l: d) conditions. the data were analyzed using the age-stage, two-sex life table theory. each experiment was replicated 45 ti...

a suitable diet and oviposition substrate are two basic needs for successful mass rearing of orius spp. and this may reduce their production costs. the effect of various foods containing eggs of ephestia kuehniella and sitotroga cerealella with various pollens were investigated on the biological parameters of o. albidipennis in the laboratory. moreover, survival, hatching rate and fecundity of ...

the damage of sugarcane whitefly,neomaskellia andropogonic corbett, has recently increased dramatically in sugarcane fields in khuzestan province. in this study, biology of n. andropgonis on four sugarcane commercial cultivars was evaluated under laboratory conditions. in this experiment, the preimaginal development, adult longevity and fecundity were studied in a growth chamber that was set at...

Adaptations that enhance fitness in one sex may be harmful to members of the opposite sex and lead to antagonistic coevolution between the sexes. In fruit flies, for example, selection for fertilization success has rendered the male ejaculate slightly toxic to females. Here we investigated whether mating imposes a cost upon female fitness in a polyandrous pierid butterfly (Colias eurytheme ) by...

Sugar consumption can increase the longevity and lifetime fecundity of many species of parasitic wasps. Consequently, for these insects the availability of sugar sources in the field is important for their reproductive success. As sugar sources can be highly variable in quantity, space and time, the chances of finding a sufficient amount of sugar to increase longevity might be very low. Therefo...