Three epochs of high resolution spectra of the star BD+20 307 show that it is a short period (∼3.4 day) spectroscopic binary of two nearly identical stars. Surprisingly, the two stars, though differing in effective temperature by only ∼250 K and having a mass ratio of 0.91, show very different Li line equivalent widths. A Li 6707Å line is only detected from the primary star, and it is weak. Thi...

levels were evaluated in all patients. All assays were carried out in duplicate. Skin prick tests on the forearm were performed in all patients using standardized latex extract containing high ammonia natural rubber latex, and a full set of 35 common. In addition, venom SPT was performed on one patient based on the subject’s clinical history. Positive tests were counted as wheals of 3 mm in dia...

We have studied the vortex state problem systematically in YBa2CusOr-, system with twinned/untwinned single crystals. Different vortex states are observed on samples with different characteristics. Our detailed I V characteristics measured in different magnetic fields, at temperature below where the resistive ìkneeî occurs, show that the dynamics of the vortex motion depends on the sample chara...

OBJECTIVE To determine whether Thr(307)-Asn(680) and Ala(307)-Ser(680) polymorphisms of the follicle-stimulating hormone receptor (FSH-R) gene are associated with male infertility, semen quality, and reproductive hormones. PATIENTS AND METHODS The FSH-R polymorphisms at codons 680 and 307 were analysed by restriction-fragment-length polymorphism (RFLP) in 172 infertile men and in an equal num...

S .......................8.................. 300 AMERICAN HEART ASSOCIATION . 307 CONTRIBUTORS TO THIS ISSUE . .319