Seyed Mehdi Hashemi

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High-energy X-rays offer several advantages over lower energy photons including: lower skin dose, higher depth dose, smaller scattered dose to tissues outside the target volume and less rounded isodose curves. These advantages in physical dose distributions have led to significant improvements in clinical radiotherapy, and high energy linear accelerators(More)
Radiotherapy represents the most widely spread technique to control and treat cancer. To increase the treatment efficiency, high energy linacs are used. However, applying high energy photon beams leads to a non-negligible dose of neutrons contaminating therapeutic beams. In addition, using conventional linacs necessitates applying wedge filters in some(More)
High-energy linear accelerators (linacs) have several advantages, including low skin doses and high dose rates at deep-seated tumours. But, at energies more than 8 MeV, photonuclear reactions produce neutron contamination around the therapeutic beam, which may induce secondary malignancies. In spite of improvements achieved in medical linac designs, many(More)
Plant secondary metabolites play an important role in plant-insect interactions and therefore such compounds may have insecticidal or biological activity against insects. Fumigant toxicity of essential oils of leaves and fruits from oriental arborvitae (Platycladus orientalis [L.] Franco) (Cupressaceae) was investigated against adults of cowpea weevil(More)
In the current study, insecticidal activity of essential oil from fruits of Juniperus communis L. subsp. hemisphaerica (Presl) Nyman was evaluated against Rhyzopertha dominica (F.) and Tribolium castaneum (Herbst) by fumigation at 24, 48, and 72 h exposure times. Dry fruits were subjected to hydrodistillation using a Clevenger-type apparatus and the(More)
Fumigant toxicity of the essential oil of aerial parts from Artemisia haussknechtii (Boiss) (Asteraceae) was investigated against the cowpea weevil Callosobruchus maculatus (Fab.), the rice weevil Sitophilus oryzae (L.), and the red flour beetle Tribolium castaneum (Herbst). Dry ground plants were subjected to hydro−distillation using a Clevenger−type(More)
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