The American horseshoe crab, Limulus polyphemus, is a classic model for vision research. Not only are the lateral eyes of Limulus relatively simple, but they share many processes with the eyes of more advanced animals, including humans (1). The eyes of Limulus also exhibit a remarkable circadian rhythm: they become nearly 1,000,000-fold more sensitive at night, accommodating for the roughly 1,0...

Little is known about the time when a malig nant growth may first release tumor emboli into the lymphatic system. The problem can be inves tigated by employing the technic of anterior cham ber inoculation, since the primary tumor may be readily destroyed by eye enucleation or x-radiation. Mouse tumor C-1300 appeared suitable for this purpose, since it metastasizes to the cervical lymph nodes of...

A combined system comprising the TrueBeam linear accelerator and a new real-time, tumor-tracking radiotherapy system, SyncTraX, was installed in our institution. The goals of this study were to assess the capability of SyncTraX in measuring the position of a fiducial marker using color fluoroscopic images, and to evaluate the dosimetric and geometric accuracy of respiratory-gated radiotherapy u...

Introduction Superficial X-ray therapy is one of the most important treatment methods in radiotherapy especially in the treatment of superficial skin lesions (Up to 300 kVp). Quality of the X-ray beam that can be expressed by Half-Value Layer (HVL), are important indices for this type of treatment effective energy of photon and Homogeneity Coefficient (HC). Materials and Methods The HC of the s...

Abstract Ternary Sb 2 O 3 –B –K glass system, with general composition of x –(70-x) B –30 K (where = 0, 10, 20, 30, 40, 50) were prepared using melt-quenching technique. Structures these glasses investigated XRD analysis and FT-IR spectroscopy. The optical properties the UV–Vis NIR JASCO (Model V-670) Double Beam Spectrophotometer. Different physical parameters, such as density (ρ), molar volum...

We present elastic moduli, gamma radiation attenuation characteristics, and transmission factor of barium–tungstate–phosphate (BTP) glasses with the chemical formula (60-y)BaO-yWO3-40P2O5, where y = 10 (S1)–40 (S4) in steps mole%. Different types mathematical simulation approaches, such as Makishima-Mackenzie model, Monte Carlo method, online Phy-X/PSD software, are utilized terms determining t...

introduction superficial x-ray therapy is one of the most important treatment methods in radiotherapy especially in the treatment of superficial skin lesions (up to 300 kvp). quality of the x-ray beam that can be expressed by half-value layer (hvl), are important indices for this type of treatment effective energy of photon and homogeneity coefficient (hc). materials and methods the hc of the s...

background: visceral leishmaniasis (vl) has strong links with poverty, substantial medical and veterinary impacts. this review aimed to focus in studies published during 1994-2016 on vl in southeastern iran. methods : the present review is based on expert knowledge and historical studies published during the past 23 yr (1994-2016) on vl in southeastern iran. in addition, related literature foun...

introduction: clinical radiation nephropathy can result in considerable morbidity and/or mortality. renal tolerance (td5/5) has been stated to be 20 gy when irradiation has been delivered to both kidneys in 3-5 weeks. therefore to minimize renal toxicity in these patients, localization and shielding of the kidneys are essential. this study was carried out to evaluate the role of 99mtc-dtpa rena...

Introduction: Clinical radiation nephropathy can result in considerable morbidity and/or mortality. Renal tolerance (TD5/5) has been stated to be 20 Gy when irradiation has been delivered to both kidneys in 3-5 weeks. Therefore to minimize renal toxicity in these patients, localization and shielding of the kidneys are essential. This study was carried out to evaluate the role of 99mTc-DTP...