a total of 711 beta-hemolytic streptococci were isolated from throat cultures of patients during 1970-73. these strains were grouped in parallel by the precipitin and bacitracin paper disk method. the former method was estab­lished as the standard by which the bacitracin technique was compared. the difference in results was about 5.67%. the greatest error (5.4%) was seen with non-group a strain...

Abstract. A multi-hole probe mounted on an aircraft provides the air velocity vector relative to aircraft, requiring knowledge of spatial orientation (e.g., Euler angles), translational and angular translate this information Earth-based reference frame determine wind vector. As is typically order magnitude higher than velocity, extracted very sensitive multiple sources error including misalignm...

abstract exchange rate volatility is one of the effective and ambiguous factors in agricultural products export. regarding the importance of agricultural trade, to avoid single-product economy, the main aim of this study is to investigate the impact of exchange rate volatility on the pistachio export of iran during 1338-1386. for this purpose, exchange rate volatility index was estimated using ...

Introduction Using multiple coils for transmission, RF pulse duration and/or specific absorption rate (SAR) can be reduced [1,2]. On the other hand, in the SAR reduction method developed in [1], SAR of shortened pulses can not be reduced significantly. In this work an SAR optimization method based on releasing phase constraints of excitation samples is developed. The new method is developed for...

The martensitic–austenitic phase transformation of a polycrystalline shape memory alloys (SMA) occurs gradually over a range of temperatures even though the monocrystal undergoes a first-order transition (at a single temperature). Factors such as material inhomogeneities and internal stresses in a polycrystal are believed to cause the spread in transformation temperatures. In this work, we assu...

PURPOSE To describe the relation between magnitude of anisometropia and interocular acuity difference (IAD), stereoacuity (SA), and the presence of amblyopia in school-aged members of a Native American tribe with a high prevalence of astigmatism. METHODS Refractive error (cycloplegic autorefraction confirmed by retinoscopy), best corrected monocular visual acuity (VA; Early Treatment Diabetic...