Ephemeral emergent insects, such as mayflies (Hexagenia spp.), are commonly used as biomonitors of persistent organic pollutants (POPs) and provide a vector for aquatic-terrestrial contaminant transfer. Mayflies bioaccumulate sediment-associated contaminants by bioconcentration and biomagnification during the aquatic stage and concentrate POP residues postemergence due to bioamplification, whic...

Emergence of new diseases and elimination of existing diseases is a key public health issue. In mathematical models of epidemics, such phenomena involve the process of infections and recoveries passing through a critical threshold where the basic reproductive ratio is 1. In this paper, we study near-critical behaviour in the context of a susceptible-infective-recovered epidemic on a random (mul...

to study the effect of different weed control methods in tomato, an experiment was conducted as completely randomized block design with three replications at the research farm of university of tehran (karaj) in 2008. the treatments consisted of post emergence (at recommended rate) or pre emergence (reduced rate in combination with mulch) application of metribuzin, rimsulfuron and sulfosulfuron,...

in order to evaluate the response of emergence rate of oil seed rape seedlings to temperature, a pot experiment was conducted to assess the relationship between emergence rate of three rape seed cultivars (apetalous flower, rgs003 and syn3) by using a non-linear regression against temperature variation. six models (tooth shape, segmented, beta, curve, quadratic and cubic) were used and the supe...

background: strabismus surgery under general anesthesia is one of the most common ophthalmic procedures in children with emergence delirium as an important post-operative complication. additionally, postoperative pain is another important issue which is considered as a contributing factor to emergence delirium. we conducted a study to compare meperidine with paracetamol on postoperative pain an...

The efficacy of augmentative releases of a predatory thrips, Franklinothrips orizabensis, was assessed for control of avocado thrips, Scirtothrips perseae. F. orizabensis were released weekly at a rate of 50 pupae per tree into replicated experimental blocks in two different Hass avocado orchards in southern California, USA. Thrips-days calculated from weekly population counts and yellow sticky...