The nucleotide sequence of a tRNA primer molecule for initiation of Moloney murine leukemia virus DNA synthesis has been determined. The sequence is heterogeneous in two positions but both forms, when drawn in a cloverleaf structure, have anticodon specificities for proline. We have termed these isoacceptors tRNA1Pro and tRNA2Pro. Aminoacylation studies confirmed the specificity for proline. Th...

introduction: osteomas are asymptomatic and rare slow growing bony tumors in temporal bone, and should be taken into account in differential diagnosis of the osteolytic solitary skull lesions. sometimes is associated with pain and functional loss. only a few cases have been reported.   case report: we describe a case of an osteoid osteoma of the temporal bone (mastoid) in a 31-year-old woman pr...

Reconstructing scalp defects can be challenging for a plastic surgeon. For this purpose, different procedures such as primary repair and coverage with skin grafts or flaps can be considered. Sometimes, the external table of the skull can be removed completely to the diploic space. At the same time or after the formation of granulation tissue, the diploic space can be covered with split-thicknes...

introduction: skull base meningiomas constitute a large proportion of the meningiomas, which are the most common benign brain tumors. the treatment of skull base meningiomas is specially challenging and controversial due to the proximity of these tumors to the vital brain structures. radiosurgery is now emerging as an efficient alternative treatment modality which involves the ablation of tumor...

introduction: notochord. although histologically benign, these tumors are locally aggressiveand present significant managment challenges . there arew some studies onevaluated the location, age and gender of the patients with chordoma in tworeferral centers in tehran.chordoma cases but there was no study about iranian cases. in this study weskull base chordomas are rare neoplasms arising from th...

Bose-Einstein condensation of sodium atoms has been observed in a novel “cloverleaf” trap. This trap combines tight confinement with excellent optical access, using only dc electromagnets. Evaporative cooling in this trap produced condensates of 5 3 106 atoms, a tenfold improvement over previous results. We measured the condensate fraction and the repulsive mean-field energy, finding agreement ...

OBJECTIVE Surgery for craniosynostosis has evolved rapidly over the past two decades, with increased emphasis on early, extensive operations. Older published series may not accurately reflect more recent experience. Our study was designed to analyze outcome in a large series of consecutive patients treated recently at a single center. METHODS We reviewed 250 consecutive patients who underwent...

We observed the upper fine structure line of neutral carbon, C I(P2 →P1) (νrest = 809 GHz), the 12CO(J=3→2) line (νrest = 345 GHz) and the 1.2 mm continuum emission from H1413+117 (Cloverleaf quasar, z = 2.5) using the IRAM interferometer. Together with the detection of the lower fine structure line (Barvainis et al. 1997), the Cloverleaf quasar is now only the second extragalactic system, besi...