Managed honey bee, Apis mellifera L., colonies are contracted to pollinate fruit and nut orchards improving crop quality and yield. Colonies placed in orchards are potentially exposed to pyrethroid insecticides used for broad-spectrum pest control. Pyrethroids have been reported to pose minimal risk to bees due to their low application rates in the field and putative repellent properties. This ...

The oncogenicity of chicken embryo lethal orphan virus for newborn hamsters has been confirmed. Tumor incidence was found to be a function of the titer of the virus inoculum. Fifty-four % (7/13) of the hamsters given i0@ 50% lethal dose developed tumors, while only 8% (8/99) of the hamsters given i0@ @ 50% lethal dose developed tumors. With a single exception, lower virus doses were nononco gen...

The ability of bacterial lipopolysaccharide (LPS) to enhance the toxicity of Shiga-like toxin II (SLT-II) was investigated in rabbits and mice. Rabbits were continuously infused with 0.5 50% lethal dose (LD50) of SLT-II per day. Rabbits that received a 30-micrograms/kg dose of LPS (0.02 LD50) on day 3 of infusion were significantly more likely to die than were rabbits receiving SLT-II only. Rab...

This study was carried out on fish channa punctatus to investigate the lethal concentration of cadmium nitrate at 24 hr. Experiment procedure repeated five times selected concentrations, noting number killed. The mean value taken. These values were taken determine LC50 for Toxicity heavy metals it may be depends upon dose and time exposure period.

Recent technological advances allow precise radiation delivery to tumor targets. As opposed to more conventional radiotherapy-where multiple small fractions are given-in some cases, the preferred course of treatment may involve only a few (or even one) large dose(s) per fraction. Under these conditions, the choice of appropriate radiobiological model complicates the tasks of predicting radiothe...

Background: Barbiturate poisoning is rare but potentially fatal. Case Report: We reported a case of barbiturate in 28-year-old woman who recovered from lethal pentobarbital deliberate self-poisoning. The initial blood concentration was 61 mg/L, corresponding to dose. Despite the ingestion high dose pentobarbital, electroencephalogram revealed an unattended pattern compatible with possible nonco...

background : in this study, we investigated the lethal potency, electrophoretic protein pattern and in vivo effects of hottentotta saulcyi scorpion venom in mice. methods : scorpions were collected at night, by using a uv lamp from mardin province, turkey. venom was obtained from mature h. saulcyi scorpions by electrical stimulation of the telson. the lethality of the venom was determined by i....

OBJECTIVE To evaluate acute toxic effect of ibogaine and noribogaine on the survival of mice and determine median lethal doses of the substances mentioned. MATERIAL AND METHODS White laboratory mice were used for the experiments. Ibogaine and noribogaine were administered intragastrically to mice via a stomach tube. Control animals received the same volume of saline. The median lethal dose wa...

Cadmium fluoride (CdF) is commonly used as an insulator for ulta high speed mass telecommunications equipment, and there is a considerable risk that industrial workers will inhale CdF particles. Despite the possibility that acute exposure can cause harmful systemic effects, there are no studies to date that address the health consequences of acute CdF exposure. This study therefore aimed to det...