Microstructure of bismuth centers in silicon before and after irradiation with 15 MeV protons.

A decrease of two-gamma annihilation rate of a positron in a strong spin-orbit field of the annihilation site of bismuth impurity centerBi (= 9/2) in silicon with natural isotope composition was revealed (is the nuclear spin). This decrease was observed along with increasing occupancy of Bi donor states (binding energy{Bi} ≈ 69 meV). Atoms ofSi (= 1/2) isotope are involved in spin interactions of positron with Bi impurity centers.

Stereotactic radiotherapy for spinal meningiomas and neurinomas.

Introduction: Over the past decades, stereotactic conformal radiotherapy of intracranial meningiomas and schwannomas has been recognized as an effective and safe procedure. Due to the wide use of the CyberKnife system and the procedure of extracranial stereotactic radiotherapy and radiosurgery, the positive experience can be used to treat spinal tumors. This study assessed the effectiveness of stereotactic radiaotherapy of spinal meningiomas and neurinomas using the CyberKnife system.

Positron annihilation on defects in silicon irradiated with 15 MeV protons.

Microstructure and thermal stability of the radiation defects in n-FZ-Si ([P] ≈ 7 × 10(15) cm(-3)) single crystals have been investigated. The radiation defects have been induced by irradiation with 15 MeV protons and studied by means of both the positron lifetime spectroscopy and low-temperature measurements of the Hall effect. At each step of the isochronal annealing over the temperature range ∼60-700 °C the positron lifetime has been measured for the temperature interval ∼30-300 K, and for samples-satellites the temperature dependences of the charge carriers and mobility have been determined over the range ∼4.

Five patients with a recently described novel leukoencephalopathy with brainstem and spinal cord involvement and elevated lactate.

Recently, a novel leukoencephalopathy syndrome was described in eight patients with a distinct pattern of MRI abnormalities. Here we describe the clinical, laboratory, and MRI findings in five new, unrelated patients. The clinical picture was homogeneous with onset in childhood, a slowly progressive course, variable mental deficits, signs of pyramidal and cerebellar dysfunction and sometimes dorsal column dysfunction.

Late diagnosis and removal of a large wooden foreign body in the cranio-orbital region.

The rare case of a large wooden foreign body impaled in the cranio-orbital region, and its late diagnosis and successful removal, is presented. A 26-year-old man was admitted to a regional hospital after suffering a severe penetrating craniocerebral injury from a motorcycle accident. Two months after the accident, computed tomographic examination at Burdenko Neurosurgical Institute revealed a large foreign body located in the cranio-orbital region and penetrating the right temporal lobe, with surrounding abscess development.